update viper

Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>

.editorconfig

@@ -0,0 +1,18 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.go]
+indent_style = tab
+
+[{Makefile,*.mk}]
+indent_style = tab
+
+[*.nix]
+indent_size = 2

.envrc

@@ -0,0 +1,4 @@
+if ! has nix_direnv_version || ! nix_direnv_version 3.0.4; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.4/direnvrc" "sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4="
+fi
+use flake . --impure

.github/.editorconfig

@@ -0,0 +1,2 @@
+[{*.yml,*.yaml}]
+indent_size = 2

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -0,0 +1,119 @@
+name: 🐛 Bug report
+description: Report a bug to help us improve Viper
+labels: [kind/bug]
+body:
+- type: markdown
+  attributes:
+    value: |
+      Thank you for submitting a bug report!
+
+      Please fill out the template below to make it easier to debug your problem.
+
+      If you are not sure if it is a bug or not, you can contact us via the available [support channels](https://github.com/spf13/viper/issues/new/choose).
+- type: checkboxes
+  attributes:
+    label: Preflight Checklist
+    description: Please ensure you've completed all of the following.
+    options:
+      - label: I have searched the [issue tracker](https://www.github.com/spf13/viper/issues) for an issue that matches the one I want to file, without success.
+        required: true
+      - label: I am not looking for support or already pursued the available [support channels](https://github.com/spf13/viper/issues/new/choose) without success.
+        required: true
+      - label: I have checked the [troubleshooting guide](https://github.com/spf13/viper/blob/master/TROUBLESHOOTING.md) for my problem, without success.
+        required: true
+- type: input
+  attributes:
+    label: Viper Version
+    description: What version of Viper are you using?
+    placeholder: 1.8.1
+  validations:
+    required: true
+- type: input
+  attributes:
+    label: Go Version
+    description: What version of Go are you using?
+    placeholder: "1.16"
+  validations:
+    required: true
+- type: dropdown
+  attributes:
+    label: Config Source
+    description: What sources do you load configuration from?
+    options:
+      - Manual set
+      - Flags
+      - Environment variables
+      - Files
+      - Remove K/V stores
+      - Defaults
+    multiple: true
+  validations:
+    required: true
+- type: dropdown
+  attributes:
+    label: Format
+    description: Which file formats do you use?
+    options:
+      - JSON
+      - YAML
+      - TOML
+      - Dotenv
+      - HCL
+      - Java properties
+      - INI
+      - Other (specify below)
+    multiple: true
+- type: input
+  attributes:
+    label: Repl.it link
+    description: Complete example on Repl.it reproducing the issue. [Here](https://repl.it/@sagikazarmark/Viper-example) is an example you can use.
+    placeholder: https://repl.it/@sagikazarmark/Viper-example
+- type: textarea
+  attributes:
+    label: Code reproducing the issue
+    description: Please provide a Repl.it link if possible.
+    render: go
+    placeholder: |
+      package main
+
+      import (
+        "github.com/spf13/viper"
+      )
+
+      func main() {
+        v := viper.New()
+
+        // ...
+
+        var config Config
+
+        err = v.Unmarshal(&config)
+        if err != nil {
+          panic(err)
+        }
+      }
+- type: textarea
+  attributes:
+    label: Expected Behavior
+    description: A clear and concise description of what you expected to happen.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Actual Behavior
+    description: A clear description of what actually happens.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Steps To Reproduce
+    description: Steps to reproduce the behavior if it is not self-explanatory.
+    placeholder: |
+      1. In this environment...
+      2. With this config...
+      3. Run '...'
+      4. See error...
+- type: textarea
+  attributes:
+    label: Additional Information
+    description: Links? References? Anything that will give us more context about the issue that you are encountering!

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,13 @@
+blank_issues_enabled: false
+contact_links:
+  - name: ❓ Ask a question
+    url: https://github.com/spf13/viper/discussions/new?category=q-a
+    about:  Ask and discuss questions with other Viper community members
+
+  - name: 📓 Reference
+    url: https://pkg.go.dev/mod/github.com/spf13/viper
+    about: Check the Go code reference
+
+  - name: 💬 Slack channel
+    url: https://gophers.slack.com/messages/viper
+    about: Please ask and answer questions here

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -0,0 +1,39 @@
+name: 🎉 Feature request
+description: Suggest an idea for Viper
+labels: [kind/enhancement]
+body:
+- type: markdown
+  attributes:
+    value: |
+      Thank you for submitting a feature request!
+
+      Please describe what you would like to change/add and why in detail by filling out the template below.
+
+      If you are not sure if your request fits into Viper, you can contact us via the available [support channels](https://github.com/spf13/viper/issues/new/choose).
+- type: checkboxes
+  attributes:
+    label: Preflight Checklist
+    description: Please ensure you've completed all of the following.
+    options:
+      - label: I have searched the [issue tracker](https://www.github.com/spf13/viper/issues) for an issue that matches the one I want to file, without success.
+        required: true
+- type: textarea
+  attributes:
+    label: Problem Description
+    description: A clear and concise description of the problem you are seeking to solve with this feature request.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Proposed Solution
+    description: A clear and concise description of what would you like to happen.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Alternatives Considered
+    description: A clear and concise description of any alternative solutions or features you've considered.
+- type: textarea
+  attributes:
+    label: Additional Information
+    description: Add any other context about the problem here.

.github/PULL_REQUEST_TEMPLATES.md

@@ -0,0 +1,20 @@
+<!--
+Thank you for sending a pull request! Here some tips for contributors:
+
+1. Fill the description template below.
+2. Include appropriate tests (if necessary). Make sure that all CI checks passed.
+3. If the Pull Request is a work in progress, make use of GitHub's "Draft PR" feature and mark it as such.
+-->
+
+**Overview**:
+<!-- Describe your changes briefly here. -->
+
+**What problem does it solve?**:
+<!--
+- Please state in detail why we need this PR and what it solves.
+- If your PR closes some of the existing issues, please add links to them here.
+  Mentioned issues will be automatically closed.
+  Usage: "Closes #<issue number>", or "Closes (paste link of issue)"
+-->
+
+**Special notes for a reviewer**:

.github/dependabot.yaml

@@ -0,0 +1,16 @@
+version: 2
+
+updates:
+  - package-ecosystem: gomod
+    directory: /
+    labels:
+      - area/dependencies
+    schedule:
+      interval: daily
+
+  - package-ecosystem: github-actions
+    directory: /
+    labels:
+      - area/dependencies
+    schedule:
+      interval: daily

.github/release.yml

@@ -0,0 +1,30 @@
+changelog:
+  exclude:
+    labels:
+      - release-note/ignore
+  categories:
+    - title: Exciting New Features 🎉
+      labels:
+        - kind/feature
+        - release-note/new-feature
+    - title: Enhancements 🚀
+      labels:
+        - kind/enhancement
+        - release-note/enhancement
+    - title: Bug Fixes 🐛
+      labels:
+        - kind/bug
+        - release-note/bug-fix
+    - title: Breaking Changes 🛠
+      labels:
+        - release-note/breaking-change
+    - title: Deprecations ❌
+      labels:
+        - release-note/deprecation
+    - title: Dependency Updates ⬆️
+      labels:
+        - area/dependencies
+        - release-note/dependency-update
+    - title: Other Changes
+      labels:
+        - "*"

.github/workflows/.editorconfig

@@ -1,2 +0,0 @@
-[*.yml]
-indent_size = 2

.github/workflows/checks.yaml

@@ -0,0 +1,30 @@
+name: PR Checks
+
+on:
+  pull_request:
+    types: [opened, labeled, unlabeled, synchronize]
+
+jobs:
+  release-label:
+    name: Release note label
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check minimum labels
+        uses: mheap/github-action-required-labels@5847eef68201219cf0a4643ea7be61e77837bbce # v5.4.1
+        with:
+          mode: minimum
+          count: 1
+          labels: |
+            release-note/ignore
+            kind/feature
+            release-note/new-feature
+            kind/enhancement
+            release-note/enhancement
+            kind/bug
+            release-note/bug-fix
+            release-note/breaking-change
+            release-note/deprecation
+            area/dependencies
+            release-note/dependency-update
+            release-note/misc

.github/workflows/ci.yaml

@@ -0,0 +1,115 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - goos: js
+            goarch: wasm
+          - goos: aix
+            goarch: ppc64
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+
+      - name: Set up Go
+        uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
+        with:
+          go-version: "1.22"
+
+      - name: Build
+        run: go build .
+        env:
+          GOOS: ${{ matrix.goos }}
+          GOARCH: ${{ matrix.goarch }}
+
+  test:
+    name: Test
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      # Fail fast is disabled because there are Go version specific features and tests
+      # that should be able to fail independently.
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        go: ["1.21", "1.22"]
+        tags: ["", "viper_finder", "viper_bind_struct"]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+
+      - name: Set up Go
+        uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: Test
+        run: go test -race -v -tags '${{ matrix.tags }}' -shuffle=on ./...
+        if: runner.os != 'Windows'
+
+      - name: Test (without race detector)
+        run: go test -v -tags '${{ matrix.tags }}' -shuffle=on ./...
+        if: runner.os == 'Windows'
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+
+      - name: Set up Go
+        uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
+        with:
+          go-version: "1.22"
+
+      - name: Lint
+        uses: golangci/golangci-lint-action@a4f60bb28d35aeee14e6880718e0c85ff1882e64 # v6.0.1
+        with:
+          version: v1.59.0
+
+  dev:
+    name: Developer environment
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+
+      - name: Set up Nix
+        uses: cachix/install-nix-action@ba0dd844c9180cbf77aa72a116d6fbc515d0e87b # v27
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+
+      - name: Check
+        run: nix flake check --impure
+
+      - name: Dev shell
+        run: nix develop --impure
+
+  dependency-review:
+    name: Dependency review
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+
+      - name: Dependency Review
+        uses: actions/dependency-review-action@72eb03d02c7872a771aacd928f3123ac62ad6d3a # v4.3.3

.github/workflows/ci.yml

@@ -1,34 +0,0 @@
-name: CI
-
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-
-jobs:
-  build:
-    name: Build
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        go: ['1.11', '1.12', '1.13']
-    env:
-      VERBOSE: 1
-      GOFLAGS: -mod=readonly
-      GOPROXY: https://proxy.golang.org
-
-    steps:
-      - name: Set up Go
-        uses: actions/setup-go@v1
-        with:
-          go-version: ${{ matrix.go }}
-
-      - name: Checkout code
-        uses: actions/checkout@v2
-
-      - name: Run tests
-        run: make test
-
-      - name: Run linter
-        run: make lint

.github/workflows/codeql-analysis.yaml

@@ -0,0 +1,72 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '22 16 * * 3'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@b611370bb5703a7efb587f9d136a52ea24c5c38c # v3.25.11
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@b611370bb5703a7efb587f9d136a52ea24c5c38c # v3.25.11
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@b611370bb5703a7efb587f9d136a52ea24c5c38c # v3.25.11
+

.github/workflows/feedback_issue.yaml

@@ -0,0 +1,32 @@
+on:
+  issues:
+    types: [opened]
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: `👋 Thanks for reporting!
+
+            A maintainer will take a look at your issue shortly. 👀
+
+            In the meantime: We are working on **Viper v2** and we would love to hear your thoughts about what you like or don't like about Viper, so we can improve or fix those issues.
+
+            ⏰ If you have a couple minutes, please take some time and share your thoughts: https://forms.gle/R6faU74qPRPAzchZ9
+
+            📣 If you've already given us your feedback, you can still help by spreading the news,
+            either by sharing the above link or telling people about this on Twitter:
+
+            https://twitter.com/sagikazarmark/status/1306904078967074816
+
+            **Thank you!** ❤️
+            `,
+            })

.github/workflows/feedback_pull_request.yaml

@@ -0,0 +1,32 @@
+on:
+  pull_request_target:
+    types: [opened]
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: `👋 Thanks for contributing to Viper! You are awesome! 🎉
+
+            A maintainer will take a look at your pull request shortly. 👀
+
+            In the meantime: We are working on **Viper v2** and we would love to hear your thoughts about what you like or don't like about Viper, so we can improve or fix those issues.
+
+            ⏰ If you have a couple minutes, please take some time and share your thoughts: https://forms.gle/R6faU74qPRPAzchZ9
+
+            📣 If you've already given us your feedback, you can still help by spreading the news,
+            either by sharing the above link or telling people about this on Twitter:
+
+            https://twitter.com/sagikazarmark/status/1306904078967074816
+
+            **Thank you!** ❤️
+            `,
+            })

.gitignore

@@ -1,20 +1,8 @@
+/.devenv/
+/.direnv/
+/.idea/
+/.pre-commit-config.yaml
 /bin/
 /build/
 /var/
 /vendor/
-
-# IDE integration
-/.vscode/*
-!/.vscode/launch.json
-!/.vscode/tasks.json
-/.idea/*
-!/.idea/codeStyles/
-!/.idea/copyright/
-!/.idea/dataSources.xml
-!/.idea/*.iml
-!/.idea/externalDependencies.xml
-!/.idea/go.imports.xml
-!/.idea/modules.xml
-!/.idea/runConfigurations/
-!/.idea/scopes/
-!/.idea/sqldialects.xml

.golangci.yaml

@@ -0,0 +1,108 @@
+run:
+    timeout: 5m
+
+linters-settings:
+    gci:
+        sections:
+            - standard
+            - default
+            - prefix(github.com/spf13/viper)
+    gocritic:
+        # Enable multiple checks by tags. See "Tags" section in https://github.com/go-critic/go-critic#usage.
+        enabled-tags:
+            - diagnostic
+            - experimental
+            - opinionated
+            - style
+        disabled-checks:
+            - importShadow
+            - unnamedResult
+    golint:
+        min-confidence: 0
+    goimports:
+        local-prefixes: github.com/spf13/viper
+
+linters:
+    disable-all: true
+    enable:
+        - bodyclose
+        - dogsled
+        - dupl
+        - durationcheck
+        - exhaustive
+        - exportloopref
+        - gci
+        - gocritic
+        - godot
+        - gofmt
+        - gofumpt
+        - goimports
+        - gomoddirectives
+        - goprintffuncname
+        - govet
+        - importas
+        - ineffassign
+        - makezero
+        - misspell
+        - nakedret
+        - nilerr
+        - noctx
+        - nolintlint
+        - prealloc
+        - predeclared
+        - revive
+        - rowserrcheck
+        - sqlclosecheck
+        - staticcheck
+        - stylecheck
+        - tparallel
+        - typecheck
+        - unconvert
+        - unparam
+        - unused
+        - wastedassign
+        - whitespace
+
+        # fixme
+        # - cyclop
+        # - errcheck
+        # - errorlint
+        # - exhaustivestruct
+        # - forbidigo
+        # - forcetypeassert
+        # - gochecknoglobals
+        # - gochecknoinits
+        # - gocognit
+        # - goconst
+        # - gocyclo
+        # - gosec
+        # - gosimple
+        # - ifshort
+        # - lll
+        # - nlreturn
+        # - paralleltest
+        # - scopelint
+        # - thelper
+        # - wrapcheck
+
+        # unused
+        # - depguard
+        # - goheader
+        # - gomodguard
+
+        # deprecated
+        # - deadcode
+        # - structcheck
+        # - varcheck
+
+        # don't enable:
+        # - asciicheck
+        # - funlen
+        # - godox
+        # - goerr113
+        # - gomnd
+        # - interfacer
+        # - maligned
+        # - nestif
+        # - testpackage
+        # - wsl

.golangci.yml

@@ -1,24 +0,0 @@
-linters-settings:
-    golint:
-        min-confidence: 0.1
-    goimports:
-        local-prefixes: github.com/spf13/viper
-
-linters:
-    enable-all: true
-    disable:
-        - funlen
-        - maligned
-
-        # TODO: fix me
-        - wsl
-        - gochecknoinits
-        - gosimple
-        - gochecknoglobals
-        - errcheck
-        - lll
-        - godox
-        - scopelint
-        - gocyclo
-        - gocognit
-        - gocritic

.idea/externalDependencies.xml

@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ExternalDependencies">
-    <plugin id="name.kropp.intellij.makefile" />
-    <plugin id="org.jetbrains.plugins.go" />
-  </component>
-</project>

.idea/go.imports.xml

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="GoImports">
-    <option name="groupStdlibImports" value="true" />
-    <option name="importSorting" value="GOFMT" />
-    <option name="moveAllImportsInOneDeclaration" value="true" />
-  </component>
-</project>

.idea/modules.xml

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/viper.iml" filepath="$PROJECT_DIR$/.idea/viper.iml" />
-    </modules>
-  </component>
-</project>

.idea/runConfigurations/Check.xml

@@ -1,7 +0,0 @@
-<component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Check" type="CompoundRunConfigurationType">
-    <toRun name="Tests" type="GoTestRunConfiguration" />
-    <toRun name="Lint" type="MAKEFILE_TARGET_RUN_CONFIGURATION" />
-    <method v="2" />
-  </configuration>
-</component>

.idea/runConfigurations/Lint.xml

@@ -1,8 +0,0 @@
-<component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Lint" type="MAKEFILE_TARGET_RUN_CONFIGURATION" factoryName="Makefile">
-    <makefile filename="$PROJECT_DIR$/Makefile" target="lint" workingDirectory="" arguments="">
-      <envs />
-    </makefile>
-    <method v="2" />
-  </configuration>
-</component>

.idea/runConfigurations/Tests.xml

@@ -1,23 +0,0 @@
-<component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Tests" type="GoTestRunConfiguration" factoryName="Go Test">
-    <module name="viper" />
-    <working_directory value="$PROJECT_DIR$/" />
-    <go_parameters value="-i" />
-    <EXTENSION ID="net.ashald.envfile">
-      <option name="IS_ENABLED" value="false" />
-      <option name="IS_SUBST" value="false" />
-      <option name="IS_PATH_MACRO_SUPPORTED" value="false" />
-      <option name="IS_IGNORE_MISSING_FILES" value="false" />
-      <option name="IS_ENABLE_EXPERIMENTAL_INTEGRATIONS" value="false" />
-      <ENTRIES>
-        <ENTRY IS_ENABLED="true" PARSER="runconfig" />
-      </ENTRIES>
-    </EXTENSION>
-    <framework value="gotest" />
-    <kind value="DIRECTORY" />
-    <package value="github.com/spf13/viper" />
-    <directory value="$PROJECT_DIR$/" />
-    <filePath value="$PROJECT_DIR$/" />
-    <method v="2" />
-  </configuration>
-</component>

.idea/viper.iml

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module type="WEB_MODULE" version="4">
-  <component name="Go" enabled="true" />
-  <component name="NewModuleRootManager">
-    <content url="file://$MODULE_DIR$" />
-    <orderEntry type="inheritedJdk" />
-    <orderEntry type="sourceFolder" forTests="false" />
-  </component>
-</module>

.travis.yml

@@ -1,32 +0,0 @@
-go_import_path: github.com/spf13/viper
-
-language: go
-
-env:
-  global:
-    - GO111MODULE="on"
-    - GOFLAGS="-mod=readonly"
-
-go:
-  - 1.11.x
-  - 1.12.x
-  - 1.13.x
-  - tip
-
-os:
-  - linux
-  - osx
-
-matrix:
-  allow_failures:
-    - go: tip
-  fast_finish: true
-
-script:
-  - go install ./...
-  - diff -u <(echo -n) <(gofmt -d .)
-  - go test -v ./...
-
-after_success:
-  - go get -u -d github.com/spf13/hugo
-  - cd $GOPATH/src/github.com/spf13/hugo && make && ./hugo -s docs && cd -

.yamlignore

@@ -0,0 +1,2 @@
+# TODO: FIXME
+/.github/

.yamllint.yaml

@@ -0,0 +1,6 @@
+ignore-from-file: [.gitignore, .yamlignore]
+
+extends: default
+
+rules:
+  line-length: disable

Makefile

@@ -15,8 +15,8 @@ TEST_FORMAT = short-verbose
 endif
 
 # Dependency versions
-GOTESTSUM_VERSION = 0.4.0
-GOLANGCI_VERSION = 1.21.0
+GOTESTSUM_VERSION = 1.9.0
+GOLANGCI_VERSION = 1.53.3
 
 # Add the ability to override some variables
 # Use with care
@@ -29,11 +29,6 @@ clear: ## Clear the working area and the project
 .PHONY: check
 check: test lint ## Run tests and linters
 
-bin/gotestsum: bin/gotestsum-${GOTESTSUM_VERSION}
-	@ln -sf gotestsum-${GOTESTSUM_VERSION} bin/gotestsum
-bin/gotestsum-${GOTESTSUM_VERSION}:
-	@mkdir -p bin
-	curl -L https://github.com/gotestyourself/gotestsum/releases/download/v${GOTESTSUM_VERSION}/gotestsum_${GOTESTSUM_VERSION}_${OS}_amd64.tar.gz | tar -zOxf - gotestsum > ./bin/gotestsum-${GOTESTSUM_VERSION} && chmod +x ./bin/gotestsum-${GOTESTSUM_VERSION}
 
 TEST_PKGS ?= ./...
 .PHONY: test
@@ -44,20 +39,36 @@ test: bin/gotestsum ## Run tests
 	@mkdir -p ${BUILD_DIR}
 	bin/gotestsum --no-summary=skipped --junitfile ${BUILD_DIR}/coverage.xml --format ${TEST_FORMAT} -- -race -coverprofile=${BUILD_DIR}/coverage.txt -covermode=atomic $(filter-out -v,${GOARGS}) $(if ${TEST_PKGS},${TEST_PKGS},./...)
 
-bin/golangci-lint: bin/golangci-lint-${GOLANGCI_VERSION}
-	@ln -sf golangci-lint-${GOLANGCI_VERSION} bin/golangci-lint
-bin/golangci-lint-${GOLANGCI_VERSION}:
-	@mkdir -p bin
-	curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b ./bin/ v${GOLANGCI_VERSION}
-	@mv bin/golangci-lint $@
-
 .PHONY: lint
-lint: bin/golangci-lint ## Run linter
-	bin/golangci-lint run
+lint: lint-go lint-yaml
+lint: ## Run linters
 
-.PHONY: fix
-fix: bin/golangci-lint ## Fix lint violations
-	bin/golangci-lint run --fix
+.PHONY: lint-go
+lint-go:
+	golangci-lint run $(if ${CI},--out-format github-actions,)
+
+.PHONY: lint-yaml
+lint-yaml:
+	yamllint $(if ${CI},-f github,) --no-warnings .
+
+.PHONY: fmt
+fmt: ## Format code
+	golangci-lint run --fix
+
+deps: bin/golangci-lint bin/gotestsum yamllint
+deps: ## Install dependencies
+
+bin/gotestsum:
+	@mkdir -p bin
+	curl -L https://github.com/gotestyourself/gotestsum/releases/download/v${GOTESTSUM_VERSION}/gotestsum_${GOTESTSUM_VERSION}_${OS}_amd64.tar.gz | tar -zOxf - gotestsum > ./bin/gotestsum && chmod +x ./bin/gotestsum
+
+bin/golangci-lint:
+	@mkdir -p bin
+	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | bash -s -- v${GOLANGCI_VERSION}
+
+.PHONY: yamllint
+yamllint:
+	pip3 install --user yamllint
 
 # Add custom targets here
 -include custom.mk

README.md

@@ -1,10 +1,20 @@
-![viper logo](https://cloud.githubusercontent.com/assets/173412/10886745/998df88a-8151-11e5-9448-4736db51020d.png)
+> ## Viper v2 feedback
+> Viper is heading towards v2 and we would love to hear what _**you**_ would like to see in it. Share your thoughts here: https://forms.gle/R6faU74qPRPAzchZ9
+>
+> **Thank you!**
 
-Go configuration with fangs!
+![Viper](.github/logo.png?raw=true)
 
-[![Actions](https://github.com/spf13/viper/workflows/CI/badge.svg)](https://github.com/spf13/viper)
+[![Mentioned in Awesome Go](https://awesome.re/mentioned-badge-flat.svg)](https://github.com/avelino/awesome-go#configuration)
+[![run on repl.it](https://repl.it/badge/github/sagikazarmark/Viper-example)](https://repl.it/@sagikazarmark/Viper-example#main.go)
+
+[![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/spf13/viper/ci.yaml?branch=master&style=flat-square)](https://github.com/spf13/viper/actions?query=workflow%3ACI)
 [![Join the chat at https://gitter.im/spf13/viper](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/spf13/viper?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-[![GoDoc](https://godoc.org/github.com/spf13/viper?status.svg)](https://godoc.org/github.com/spf13/viper)
+[![Go Report Card](https://goreportcard.com/badge/github.com/spf13/viper?style=flat-square)](https://goreportcard.com/report/github.com/spf13/viper)
+![Go Version](https://img.shields.io/badge/go%20version-%3E=1.21-61CFDD.svg?style=flat-square)
+[![PkgGoDev](https://pkg.go.dev/badge/mod/github.com/spf13/viper)](https://pkg.go.dev/mod/github.com/spf13/viper)
+
+**Go configuration with fangs!**
 
 Many Go projects are built using Viper including:
 
@@ -17,19 +27,25 @@ Many Go projects are built using Viper including:
 * [doctl](https://github.com/digitalocean/doctl)
 * [Clairctl](https://github.com/jgsqware/clairctl)
 * [Mercure](https://mercure.rocks)
+* [Meshery](https://github.com/meshery/meshery)
+* [Bearer](https://github.com/bearer/bearer)
+* [Coder](https://github.com/coder/coder)
+* [Vitess](https://vitess.io/)
 
 
 ## Install
 
-```console
+```shell
 go get github.com/spf13/viper
 ```
 
+**Note:** Viper uses [Go Modules](https://go.dev/wiki/Modules) to manage dependencies.
+
 
 ## What is Viper?
 
-Viper is a complete configuration solution for Go applications including 12-Factor apps. It is designed
-to work within an application, and can handle all types of configuration needs
+Viper is a complete configuration solution for Go applications including [12-Factor apps](https://12factor.net/#the_twelve_factors).
+It is designed to work within an application, and can handle all types of configuration needs
 and formats. It supports:
 
 * setting defaults
@@ -107,7 +123,7 @@ viper.AddConfigPath("$HOME/.appname")  // call multiple times to add many search
 viper.AddConfigPath(".")               // optionally look for config in the working directory
 err := viper.ReadInConfig() // Find and read the config file
 if err != nil { // Handle errors reading the config file
-	panic(fmt.Errorf("Fatal error config file: %s \n", err))
+	panic(fmt.Errorf("fatal error config file: %w", err))
 }
 ```
 
@@ -115,17 +131,17 @@ You can handle the specific case where no config file is found like this:
 
 ```go
 if err := viper.ReadInConfig(); err != nil {
-    if _, ok := err.(viper.ConfigFileNotFoundError); ok {
-        // Config file not found; ignore error if desired
-    } else {
-        // Config file was found but another error was produced
-    }
+	if _, ok := err.(viper.ConfigFileNotFoundError); ok {
+		// Config file not found; ignore error if desired
+	} else {
+		// Config file was found but another error was produced
+	}
 }
 
 // Config file found and successfully parsed
 ```
 
-*NOTE [since 1.6]:* You can also have a file without an extension and specify the format programmaticaly. For those configuration files that lie in the home of the user without any extension like `.bashrc`
+*NOTE [since 1.6]:* You can also have a file without an extension and specify the format programmatically. For those configuration files that lie in the home of the user without any extension like `.bashrc`
 
 ### Writing Config Files
 
@@ -163,10 +179,10 @@ Optionally you can provide a function for Viper to run each time a change occurs
 **Make sure you add all of the configPaths prior to calling `WatchConfig()`**
 
 ```go
-viper.WatchConfig()
 viper.OnConfigChange(func(e fsnotify.Event) {
 	fmt.Println("Config file changed:", e.Name)
 })
+viper.WatchConfig()
 ```
 
 ### Reading Config from io.Reader
@@ -206,6 +222,7 @@ These could be from a command line flag, or from your own application logic.
 ```go
 viper.Set("Verbose", true)
 viper.Set("LogFile", LogFile)
+viper.Set("host.port", 5899)   // set subset
 ```
 
 ### Registering and Using Aliases
@@ -242,9 +259,10 @@ using `SetEnvPrefix`, you can tell Viper to use a prefix while reading from
 the environment variables. Both `BindEnv` and `AutomaticEnv` will use this
 prefix.
 
-`BindEnv` takes one or two parameters. The first parameter is the key name, the
-second is the name of the environment variable. The name of the environment
-variable is case sensitive. If the ENV variable name is not provided, then
+`BindEnv` takes one or more parameters. The first parameter is the key name, the
+rest are the name of the environment variables to bind to this key. If more than
+one are provided, they will take precedence in the specified order. The name of
+the environment variable is case sensitive. If the ENV variable name is not provided, then
 Viper will automatically assume that the ENV variable matches the following format: prefix + "_" + the key name in ALL CAPS. When you explicitly provide the ENV variable name (the second parameter),
 it **does not** automatically add the prefix. For example if the second parameter is "id",
 Viper will look for the ENV variable "ID".
@@ -256,7 +274,7 @@ the `BindEnv` is called.
 `AutomaticEnv` is a powerful helper especially when combined with
 `SetEnvPrefix`. When called, Viper will check for an environment variable any
 time a `viper.Get` request is made. It will apply the following rules. It will
-check for a environment variable with a name matching the key uppercased and
+check for an environment variable with a name matching the key uppercased and
 prefixed with the `EnvPrefix` if set.
 
 `SetEnvKeyReplacer` allows you to use a `strings.Replacer` object to rewrite Env
@@ -341,7 +359,7 @@ func main() {
 
 	i := viper.GetInt("flagname") // retrieve value from viper
 
-	...
+	// ...
 }
 ```
 
@@ -400,7 +418,9 @@ in a Key/Value store such as etcd or Consul.  These values take precedence over
 default values, but are overridden by configuration values retrieved from disk,
 flags, or environment variables.
 
-Viper uses [crypt](https://github.com/xordataexchange/crypt) to retrieve
+Viper supports multiple hosts. To use, pass a list of endpoints separated by `;`. For example `http://127.0.0.1:4001;http://127.0.0.1:4002`.
+
+Viper uses [crypt](https://github.com/sagikazarmark/crypt) to retrieve
 configuration from the K/V store, which means that you can store your
 configuration values encrypted and have them automatically decrypted if you have
 the correct gpg keyring.  Encryption is optional.
@@ -412,7 +432,7 @@ independently of it.
 K/V store. `crypt` defaults to etcd on http://127.0.0.1:4001.
 
 ```bash
-$ go get github.com/xordataexchange/crypt/bin/crypt
+$ go get github.com/sagikazarmark/crypt/bin/crypt
 $ crypt set -plaintext /config/hugo.json /Users/hugo/settings/config.json
 ```
 
@@ -434,8 +454,15 @@ viper.SetConfigType("json") // because there is no file extension in a stream of
 err := viper.ReadRemoteConfig()
 ```
 
+#### etcd3
+```go
+viper.AddRemoteProvider("etcd3", "http://127.0.0.1:4001","/config/hugo.json")
+viper.SetConfigType("json") // because there is no file extension in a stream of bytes, supported extensions are "json", "toml", "yaml", "yml", "properties", "props", "prop", "env", "dotenv"
+err := viper.ReadRemoteConfig()
+```
+
 #### Consul
-You need to set a key to Consul key/value storage with JSON value containing your desired config.  
+You need to set a key to Consul key/value storage with JSON value containing your desired config.
 For example, create a Consul key/value store key `MY_CONSUL_KEY` with value:
 
 ```json
@@ -454,6 +481,25 @@ fmt.Println(viper.Get("port")) // 8080
 fmt.Println(viper.Get("hostname")) // myhostname.com
 ```
 
+#### Firestore
+
+```go
+viper.AddRemoteProvider("firestore", "google-cloud-project-id", "collection/document")
+viper.SetConfigType("json") // Config's format: "json", "toml", "yaml", "yml"
+err := viper.ReadRemoteConfig()
+```
+
+Of course, you're allowed to use `SecureRemoteProvider` also
+
+
+#### NATS
+
+```go
+viper.AddRemoteProvider("nats", "nats://127.0.0.1:4222", "myapp.config")
+viper.SetConfigType("json")
+err := viper.ReadRemoteConfig()
+```
+
 ### Remote Key/Value Store Example - Encrypted
 
 ```go
@@ -480,18 +526,18 @@ runtime_viper.Unmarshal(&runtime_conf)
 // open a goroutine to watch remote changes forever
 go func(){
 	for {
-	    time.Sleep(time.Second * 5) // delay after each request
+		time.Sleep(time.Second * 5) // delay after each request
 
-	    // currently, only tested with etcd support
-	    err := runtime_viper.WatchRemoteConfig()
-	    if err != nil {
-	        log.Errorf("unable to read remote config: %v", err)
-	        continue
-	    }
+		// currently, only tested with etcd support
+		err := runtime_viper.WatchRemoteConfig()
+		if err != nil {
+			log.Errorf("unable to read remote config: %v", err)
+			continue
+		}
 
-	    // unmarshal new config into our runtime config struct. you can also use channel
-	    // to implement a signal to notify the system of the changes
-	    runtime_viper.Unmarshal(&runtime_conf)
+		// unmarshal new config into our runtime config struct. you can also use channel
+		// to implement a signal to notify the system of the changes
+		runtime_viper.Unmarshal(&runtime_conf)
 	}
 }()
 ```
@@ -501,29 +547,32 @@ go func(){
 In Viper, there are a few ways to get a value depending on the value’s type.
 The following functions and methods exist:
 
- * `Get(key string) : interface{}`
+ * `Get(key string) : any`
  * `GetBool(key string) : bool`
  * `GetFloat64(key string) : float64`
  * `GetInt(key string) : int`
  * `GetIntSlice(key string) : []int`
  * `GetString(key string) : string`
- * `GetStringMap(key string) : map[string]interface{}`
+ * `GetStringMap(key string) : map[string]any`
  * `GetStringMapString(key string) : map[string]string`
  * `GetStringSlice(key string) : []string`
  * `GetTime(key string) : time.Time`
  * `GetDuration(key string) : time.Duration`
  * `IsSet(key string) : bool`
- * `AllSettings() : map[string]interface{}`
+ * `AllSettings() : map[string]any`
 
 One important thing to recognize is that each Get function will return a zero
 value if it’s not found. To check if a given key exists, the `IsSet()` method
 has been provided.
 
+The zero value will also be returned if the value is set, but fails to parse
+as the requested type.
+
 Example:
 ```go
 viper.GetString("logfile") // case-insensitive Setting & Getting
 if viper.GetBool("verbose") {
-    fmt.Println("verbose enabled")
+	fmt.Println("verbose enabled")
 }
 ```
 ### Accessing nested keys
@@ -569,10 +618,37 @@ the `Set()` method, …) with an immediate value, then all sub-keys of
 `datastore.metric` become undefined, they are “shadowed” by the higher-priority
 configuration level.
 
+Viper can access array indices by using numbers in the path. For example:
+
+```jsonc
+{
+    "host": {
+        "address": "localhost",
+        "ports": [
+            5799,
+            6029
+        ]
+    },
+    "datastore": {
+        "metric": {
+            "host": "127.0.0.1",
+            "port": 3099
+        },
+        "warehouse": {
+            "host": "198.0.0.1",
+            "port": 2112
+        }
+    }
+}
+
+GetInt("host.ports.1") // returns 6029
+
+```
+
 Lastly, if there exists a key that matches the delimited key path, its value
 will be returned instead. E.g.
 
-```json
+```jsonc
 {
     "datastore.metric.host": "0.0.0.0",
     "host": {
@@ -594,14 +670,15 @@ will be returned instead. E.g.
 GetString("datastore.metric.host") // returns "0.0.0.0"
 ```
 
-### Extract sub-tree
+### Extracting a sub-tree
 
-Extract sub-tree from Viper.
+When developing reusable modules, it's often useful to extract a subset of the configuration
+and pass it to a module. This way the module can be instantiated more than once, with different configurations.
 
-For example, `viper` represents:
+For example, an application might use multiple different cache stores for different purposes:
 
-```json
-app:
+```yaml
+cache:
   cache1:
     max-items: 100
     item-size: 64
@@ -610,35 +687,36 @@ app:
     item-size: 80
 ```
 
-After executing:
+We could pass the cache name to a module (eg. `NewCache("cache1")`),
+but it would require weird concatenation for accessing config keys and would be less separated from the global config.
+
+So instead of doing that let's pass a Viper instance to the constructor that represents a subset of the configuration:
 
 ```go
-subv := viper.Sub("app.cache1")
+cache1Config := viper.Sub("cache.cache1")
+if cache1Config == nil { // Sub returns nil if the key cannot be found
+	panic("cache configuration not found")
+}
+
+cache1 := NewCache(cache1Config)
 ```
 
-`subv` represents:
+**Note:** Always check the return value of `Sub`. It returns `nil` if a key cannot be found.
 
-```json
-max-items: 100
-item-size: 64
-```
-
-Suppose we have:
+Internally, the `NewCache` function can address `max-items` and `item-size` keys directly:
 
 ```go
-func NewCache(cfg *Viper) *Cache {...}
+func NewCache(v *Viper) *Cache {
+	return &Cache{
+		MaxItems: v.GetInt("max-items"),
+		ItemSize: v.GetInt("item-size"),
+	}
+}
 ```
 
-which creates a cache based on config information formatted as `subv`.
-Now it’s easy to create these 2 caches separately as:
+The resulting code is easy to test, since it's decoupled from the main config structure,
+and easier to reuse (for the same reason).
 
-```go
-cfg1 := viper.Sub("app.cache1")
-cache1 := NewCache(cfg1)
-
-cfg2 := viper.Sub("app.cache2")
-cache2 := NewCache(cfg2)
-```
 
 ### Unmarshaling
 
@@ -647,8 +725,8 @@ etc.
 
 There are two methods to do this:
 
- * `Unmarshal(rawVal interface{}) : error`
- * `UnmarshalKey(key string, rawVal interface{}) : error`
+ * `Unmarshal(rawVal any) : error`
+ * `UnmarshalKey(key string, rawVal any) : error`
 
 Example:
 
@@ -673,19 +751,19 @@ you have to change the delimiter:
 ```go
 v := viper.NewWithOptions(viper.KeyDelimiter("::"))
 
-v.SetDefault("chart::values", map[string]interface{}{
-    "ingress": map[string]interface{}{
-        "annotations": map[string]interface{}{
-            "traefik.frontend.rule.type":                 "PathPrefix",
-            "traefik.ingress.kubernetes.io/ssl-redirect": "true",
-        },
-    },
+v.SetDefault("chart::values", map[string]any{
+	"ingress": map[string]any{
+		"annotations": map[string]any{
+			"traefik.frontend.rule.type":                 "PathPrefix",
+			"traefik.ingress.kubernetes.io/ssl-redirect": "true",
+		},
+	},
 })
 
 type config struct {
 	Chart struct{
-        Values map[string]interface{}
-    }
+		Values map[string]any
+	}
 }
 
 var C config
@@ -724,38 +802,49 @@ if err != nil {
 }
 ```
 
-Viper uses [github.com/mitchellh/mapstructure](https://github.com/mitchellh/mapstructure) under the hood for unmarshaling values which uses `mapstructure` tags by default.
+Viper uses [github.com/go-viper/mapstructure](https://github.com/go-viper/mapstructure) under the hood for unmarshaling values which uses `mapstructure` tags by default.
+
+### Decoding custom formats
+
+A frequently requested feature for Viper is adding more value formats and decoders.
+For example, parsing character (dot, comma, semicolon, etc) separated strings into slices.
+
+This is already available in Viper using mapstructure decode hooks.
+
+Read more about the details in [this blog post](https://sagikazarmark.hu/blog/decoding-custom-formats-with-viper/).
 
 ### Marshalling to string
 
-You may need to marshal all the settings held in viper into a string rather than write them to a file. 
+You may need to marshal all the settings held in viper into a string rather than write them to a file.
 You can use your favorite format's marshaller with the config returned by `AllSettings()`.
 
 ```go
 import (
-    yaml "gopkg.in/yaml.v2"
-    // ...
-) 
+	yaml "gopkg.in/yaml.v2"
+	// ...
+)
 
 func yamlStringSettings() string {
-    c := viper.AllSettings()
-    bs, err := yaml.Marshal(c)
-    if err != nil {
-        log.Fatalf("unable to marshal config to YAML: %v", err)
-    }
-    return string(bs)
+	c := viper.AllSettings()
+	bs, err := yaml.Marshal(c)
+	if err != nil {
+		log.Fatalf("unable to marshal config to YAML: %v", err)
+	}
+	return string(bs)
 }
 ```
 
 ## Viper or Vipers?
 
-Viper comes ready to use out of the box. There is no configuration or
-initialization needed to begin using Viper. Since most applications will want
-to use a single central repository for their configuration, the viper package
-provides this. It is similar to a singleton.
+Viper comes with a global instance (singleton) out of the box.
 
-In all of the examples above, they demonstrate using viper in its singleton
-style approach.
+Although it makes setting up configuration easy,
+using it is generally discouraged as it makes testing harder and can lead to unexpected behavior.
+
+The best practice is to initialize a Viper instance and pass that around when necessary.
+
+The global instance _MAY_ be deprecated in the future.
+See [#1855](https://github.com/spf13/viper/issues/1855) for more details.
 
 ### Working with multiple vipers
 
@@ -779,15 +868,63 @@ y.SetDefault("ContentDir", "foobar")
 When working with multiple vipers, it is up to the user to keep track of the
 different vipers.
 
+
 ## Q & A
 
-Q: Why is it called “Viper”?
+### Why is it called “Viper”?
 
 A: Viper is designed to be a [companion](http://en.wikipedia.org/wiki/Viper_(G.I._Joe))
 to [Cobra](https://github.com/spf13/cobra). While both can operate completely
 independently, together they make a powerful pair to handle much of your
 application foundation needs.
 
-Q: Why is it called “Cobra”?
+### Why is it called “Cobra”?
 
-A: Is there a better name for a [commander](http://en.wikipedia.org/wiki/Cobra_Commander)?
+Is there a better name for a [commander](http://en.wikipedia.org/wiki/Cobra_Commander)?
+
+### Does Viper support case sensitive keys?
+
+**tl;dr:** No.
+
+Viper merges configuration from various sources, many of which are either case insensitive or uses different casing than the rest of the sources (eg. env vars).
+In order to provide the best experience when using multiple sources, the decision has been made to make all keys case insensitive.
+
+There has been several attempts to implement case sensitivity, but unfortunately it's not that trivial. We might take a stab at implementing it in [Viper v2](https://github.com/spf13/viper/issues/772), but despite the initial noise, it does not seem to be requested that much.
+
+You can vote for case sensitivity by filling out this feedback form: https://forms.gle/R6faU74qPRPAzchZ9
+
+### Is it safe to concurrently read and write to a viper?
+
+No, you will need to synchronize access to the viper yourself (for example by using the `sync` package). Concurrent reads and writes can cause a panic.
+
+## Troubleshooting
+
+See [TROUBLESHOOTING.md](TROUBLESHOOTING.md).
+
+## Development
+
+**For an optimal developer experience, it is recommended to install [Nix](https://nixos.org/download.html) and [direnv](https://direnv.net/docs/installation.html).**
+
+_Alternatively, install [Go](https://go.dev/dl/) on your computer then run `make deps` to install the rest of the dependencies._
+
+Run the test suite:
+
+```shell
+make test
+```
+
+Run linters:
+
+```shell
+make lint # pass -j option to run them in parallel
+```
+
+Some linter violations can automatically be fixed:
+
+```shell
+make fmt
+```
+
+## License
+
+The project is licensed under the [MIT License](LICENSE).

TROUBLESHOOTING.md

@@ -0,0 +1,32 @@
+# Troubleshooting
+
+## Unmarshaling doesn't work
+
+The most common reason for this issue is improper use of struct tags (eg. `yaml` or `json`). Viper uses [github.com/mitchellh/mapstructure](https://github.com/mitchellh/mapstructure) under the hood for unmarshaling values which uses `mapstructure` tags by default. Please refer to the library's documentation for using other struct tags.
+
+## Cannot find package
+
+Viper installation seems to fail a lot lately with the following (or a similar) error:
+
+```
+cannot find package "github.com/hashicorp/hcl/tree/hcl1" in any of:
+/usr/local/Cellar/go/1.15.7_1/libexec/src/github.com/hashicorp/hcl/tree/hcl1 (from $GOROOT)
+/Users/user/go/src/github.com/hashicorp/hcl/tree/hcl1 (from $GOPATH)
+```
+
+As the error message suggests, Go tries to look up dependencies in `GOPATH` mode (as it's commonly called) from the `GOPATH`.
+Viper opted to use [Go Modules](https://go.dev/wiki/Modules) to manage its dependencies. While in many cases the two methods are interchangeable, once a dependency releases new (major) versions, `GOPATH` mode is no longer able to decide which version to use, so it'll either use one that's already present or pick a version (usually the `master` branch).
+
+The solution is easy: switch to using Go Modules.
+Please refer to the [wiki](https://go.dev/wiki/Modules) on how to do that.
+
+**tl;dr* `export GO111MODULE=on`
+
+## Unquoted 'y' and 'n' characters get replaced with _true_ and _false_ when reading a YAML file
+
+This is a YAML 1.1 feature according to [go-yaml/yaml#740](https://github.com/go-yaml/yaml/issues/740).
+
+Potential solutions are:
+
+1. Quoting values resolved as boolean
+1. Upgrading to YAML v3 (for the time being this is possible by passing the `viper_yaml3` tag to your build)

encoding.go

@@ -0,0 +1,181 @@
+package viper
+
+import (
+	"errors"
+	"strings"
+	"sync"
+
+	"github.com/spf13/viper/internal/encoding/dotenv"
+	"github.com/spf13/viper/internal/encoding/json"
+	"github.com/spf13/viper/internal/encoding/toml"
+	"github.com/spf13/viper/internal/encoding/yaml"
+)
+
+// Encoder encodes Viper's internal data structures into a byte representation.
+// It's primarily used for encoding a map[string]any into a file format.
+type Encoder interface {
+	Encode(v map[string]any) ([]byte, error)
+}
+
+// Decoder decodes the contents of a byte slice into Viper's internal data structures.
+// It's primarily used for decoding contents of a file into a map[string]any.
+type Decoder interface {
+	Decode(b []byte, v map[string]any) error
+}
+
+// Codec combines [Encoder] and [Decoder] interfaces.
+type Codec interface {
+	Encoder
+	Decoder
+}
+
+// TODO: consider adding specific errors for not found scenarios
+
+// EncoderRegistry returns an [Encoder] for a given format.
+//
+// Format is case-insensitive.
+//
+// [EncoderRegistry] returns an error if no [Encoder] is registered for the format.
+type EncoderRegistry interface {
+	Encoder(format string) (Encoder, error)
+}
+
+// DecoderRegistry returns an [Decoder] for a given format.
+//
+// Format is case-insensitive.
+//
+// [DecoderRegistry] returns an error if no [Decoder] is registered for the format.
+type DecoderRegistry interface {
+	Decoder(format string) (Decoder, error)
+}
+
+// [CodecRegistry] combines [EncoderRegistry] and [DecoderRegistry] interfaces.
+type CodecRegistry interface {
+	EncoderRegistry
+	DecoderRegistry
+}
+
+// WithEncoderRegistry sets a custom [EncoderRegistry].
+func WithEncoderRegistry(r EncoderRegistry) Option {
+	return optionFunc(func(v *Viper) {
+		if r == nil {
+			return
+		}
+
+		v.encoderRegistry = r
+	})
+}
+
+// WithDecoderRegistry sets a custom [DecoderRegistry].
+func WithDecoderRegistry(r DecoderRegistry) Option {
+	return optionFunc(func(v *Viper) {
+		if r == nil {
+			return
+		}
+
+		v.decoderRegistry = r
+	})
+}
+
+// WithCodecRegistry sets a custom [EncoderRegistry] and [DecoderRegistry].
+func WithCodecRegistry(r CodecRegistry) Option {
+	return optionFunc(func(v *Viper) {
+		if r == nil {
+			return
+		}
+
+		v.encoderRegistry = r
+		v.decoderRegistry = r
+	})
+}
+
+// DefaultCodecRegistry is a simple implementation of [CodecRegistry] that allows registering custom [Codec]s.
+type DefaultCodecRegistry struct {
+	codecs map[string]Codec
+
+	mu   sync.RWMutex
+	once sync.Once
+}
+
+// NewCodecRegistry returns a new [CodecRegistry], ready to accept custom [Codec]s.
+func NewCodecRegistry() *DefaultCodecRegistry {
+	r := &DefaultCodecRegistry{}
+
+	r.init()
+
+	return r
+}
+
+func (r *DefaultCodecRegistry) init() {
+	r.once.Do(func() {
+		r.codecs = map[string]Codec{}
+	})
+}
+
+// RegisterCodec registers a custom [Codec].
+//
+// Format is case-insensitive.
+func (r *DefaultCodecRegistry) RegisterCodec(format string, codec Codec) error {
+	r.init()
+
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	r.codecs[strings.ToLower(format)] = codec
+
+	return nil
+}
+
+// Encoder implements the [EncoderRegistry] interface.
+//
+// Format is case-insensitive.
+func (r *DefaultCodecRegistry) Encoder(format string) (Encoder, error) {
+	encoder, ok := r.codec(format)
+	if !ok {
+		return nil, errors.New("encoder not found for this format")
+	}
+
+	return encoder, nil
+}
+
+// Decoder implements the [DecoderRegistry] interface.
+//
+// Format is case-insensitive.
+func (r *DefaultCodecRegistry) Decoder(format string) (Decoder, error) {
+	decoder, ok := r.codec(format)
+	if !ok {
+		return nil, errors.New("decoder not found for this format")
+	}
+
+	return decoder, nil
+}
+
+func (r *DefaultCodecRegistry) codec(format string) (Codec, bool) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	format = strings.ToLower(format)
+
+	if r.codecs != nil {
+		codec, ok := r.codecs[format]
+		if ok {
+			return codec, true
+		}
+	}
+
+	switch format {
+	case "yaml", "yml":
+		return yaml.Codec{}, true
+
+	case "json":
+		return json.Codec{}, true
+
+	case "toml":
+		return toml.Codec{}, true
+
+	case "dotenv", "env":
+		return &dotenv.Codec{}, true
+	}
+
+	return nil, false
+}

encoding_test.go

@@ -0,0 +1,105 @@
+package viper
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type codec struct{}
+
+func (codec) Encode(_ map[string]any) ([]byte, error) {
+	return nil, nil
+}
+
+func (codec) Decode(_ []byte, _ map[string]any) error {
+	return nil
+}
+
+func TestDefaultCodecRegistry(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		registry := NewCodecRegistry()
+
+		c := codec{}
+
+		err := registry.RegisterCodec("myformat", c)
+		require.NoError(t, err)
+
+		encoder, err := registry.Encoder("myformat")
+		require.NoError(t, err)
+
+		assert.Equal(t, c, encoder)
+
+		decoder, err := registry.Decoder("myformat")
+		require.NoError(t, err)
+
+		assert.Equal(t, c, decoder)
+	})
+
+	t.Run("CodecNotFound", func(t *testing.T) {
+		registry := NewCodecRegistry()
+
+		_, err := registry.Encoder("myformat")
+		require.Error(t, err)
+
+		_, err = registry.Decoder("myformat")
+		require.Error(t, err)
+	})
+
+	t.Run("FormatIsCaseInsensitive", func(t *testing.T) {
+		registry := NewCodecRegistry()
+
+		c := codec{}
+
+		err := registry.RegisterCodec("MYFORMAT", c)
+		require.NoError(t, err)
+
+		{
+			encoder, err := registry.Encoder("myformat")
+			require.NoError(t, err)
+
+			assert.Equal(t, c, encoder)
+		}
+
+		{
+			encoder, err := registry.Encoder("MYFORMAT")
+			require.NoError(t, err)
+
+			assert.Equal(t, c, encoder)
+		}
+
+		{
+			decoder, err := registry.Decoder("myformat")
+			require.NoError(t, err)
+
+			assert.Equal(t, c, decoder)
+		}
+
+		{
+			decoder, err := registry.Decoder("MYFORMAT")
+			require.NoError(t, err)
+
+			assert.Equal(t, c, decoder)
+		}
+	})
+
+	t.Run("OverrideDefault", func(t *testing.T) {
+		registry := NewCodecRegistry()
+
+		c := codec{}
+
+		err := registry.RegisterCodec("yaml", c)
+		require.NoError(t, err)
+
+		encoder, err := registry.Encoder("yaml")
+		require.NoError(t, err)
+
+		assert.Equal(t, c, encoder)
+
+		decoder, err := registry.Decoder("yaml")
+		require.NoError(t, err)
+
+		assert.Equal(t, c, decoder)
+	})
+}

experimental.go

@@ -0,0 +1,8 @@
+package viper
+
+// ExperimentalBindStruct tells Viper to use the new bind struct feature.
+func ExperimentalBindStruct() Option {
+	return optionFunc(func(v *Viper) {
+		v.experimentalBindStruct = true
+	})
+}

file.go

@@ -0,0 +1,104 @@
+package viper
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/sagikazarmark/locafero"
+	"github.com/spf13/afero"
+)
+
+// ExperimentalFinder tells Viper to use the new Finder interface for finding configuration files.
+func ExperimentalFinder() Option {
+	return optionFunc(func(v *Viper) {
+		v.experimentalFinder = true
+	})
+}
+
+// Search for a config file.
+func (v *Viper) findConfigFile() (string, error) {
+	finder := v.finder
+
+	if finder == nil && v.experimentalFinder {
+		var names []string
+
+		if v.configType != "" {
+			names = locafero.NameWithOptionalExtensions(v.configName, SupportedExts...)
+		} else {
+			names = locafero.NameWithExtensions(v.configName, SupportedExts...)
+		}
+
+		finder = locafero.Finder{
+			Paths: v.configPaths,
+			Names: names,
+			Type:  locafero.FileTypeFile,
+		}
+	}
+
+	if finder != nil {
+		return v.findConfigFileWithFinder(finder)
+	}
+
+	return v.findConfigFileOld()
+}
+
+func (v *Viper) findConfigFileWithFinder(finder Finder) (string, error) {
+	results, err := finder.Find(v.fs)
+	if err != nil {
+		return "", err
+	}
+
+	if len(results) == 0 {
+		return "", ConfigFileNotFoundError{v.configName, fmt.Sprintf("%s", v.configPaths)}
+	}
+
+	// We call clean on the final result to ensure that the path is in its canonical form.
+	// This is mostly for consistent path handling and to make sure tests pass.
+	return results[0], nil
+}
+
+// Search all configPaths for any config file.
+// Returns the first path that exists (and is a config file).
+func (v *Viper) findConfigFileOld() (string, error) {
+	v.logger.Info("searching for config in paths", "paths", v.configPaths)
+
+	for _, cp := range v.configPaths {
+		file := v.searchInPath(cp)
+		if file != "" {
+			return file, nil
+		}
+	}
+	return "", ConfigFileNotFoundError{v.configName, fmt.Sprintf("%s", v.configPaths)}
+}
+
+func (v *Viper) searchInPath(in string) (filename string) {
+	v.logger.Debug("searching for config in path", "path", in)
+	for _, ext := range SupportedExts {
+		v.logger.Debug("checking if file exists", "file", filepath.Join(in, v.configName+"."+ext))
+		if b, _ := exists(v.fs, filepath.Join(in, v.configName+"."+ext)); b {
+			v.logger.Debug("found file", "file", filepath.Join(in, v.configName+"."+ext))
+			return filepath.Join(in, v.configName+"."+ext)
+		}
+	}
+
+	if v.configType != "" {
+		if b, _ := exists(v.fs, filepath.Join(in, v.configName)); b {
+			return filepath.Join(in, v.configName)
+		}
+	}
+
+	return ""
+}
+
+// exists checks if file exists.
+func exists(fs afero.Fs, path string) (bool, error) {
+	stat, err := fs.Stat(path)
+	if err == nil {
+		return !stat.IsDir(), nil
+	}
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return false, err
+}

finder.go

@@ -0,0 +1,55 @@
+package viper
+
+import (
+	"errors"
+
+	"github.com/spf13/afero"
+)
+
+// WithFinder sets a custom [Finder].
+func WithFinder(f Finder) Option {
+	return optionFunc(func(v *Viper) {
+		if f == nil {
+			return
+		}
+
+		v.finder = f
+	})
+}
+
+// Finder looks for files and directories in an [afero.Fs] filesystem.
+type Finder interface {
+	Find(fsys afero.Fs) ([]string, error)
+}
+
+// Finders combines multiple finders into one.
+func Finders(finders ...Finder) Finder {
+	return &combinedFinder{finders: finders}
+}
+
+// combinedFinder is a Finder that combines multiple finders.
+type combinedFinder struct {
+	finders []Finder
+}
+
+// Find implements the [Finder] interface.
+func (c *combinedFinder) Find(fsys afero.Fs) ([]string, error) {
+	var results []string
+	var errs []error
+
+	for _, finder := range c.finders {
+		if finder == nil {
+			continue
+		}
+
+		r, err := finder.Find(fsys)
+		if err != nil {
+			errs = append(errs, err)
+			continue
+		}
+
+		results = append(results, r...)
+	}
+
+	return results, errors.Join(errs...)
+}

finder_example_test.go

@@ -0,0 +1,73 @@
+package viper_test
+
+import (
+	"fmt"
+
+	"github.com/sagikazarmark/locafero"
+	"github.com/spf13/afero"
+
+	"github.com/spf13/viper"
+)
+
+func ExampleFinder() {
+	fs := afero.NewMemMapFs()
+
+	fs.Mkdir("/home/user", 0o777)
+
+	f, _ := fs.Create("/home/user/myapp.yaml")
+	f.WriteString("foo: bar")
+	f.Close()
+
+	// HCL will have a "lower" priority in the search order
+	fs.Create("/home/user/myapp.hcl")
+
+	finder := locafero.Finder{
+		Paths: []string{"/home/user"},
+		Names: locafero.NameWithExtensions("myapp", viper.SupportedExts...),
+		Type:  locafero.FileTypeFile, // This is important!
+	}
+
+	v := viper.NewWithOptions(viper.WithFinder(finder))
+	v.SetFs(fs)
+	v.ReadInConfig()
+
+	fmt.Println(v.GetString("foo"))
+
+	// Output:
+	// bar
+}
+
+func ExampleFinders() {
+	fs := afero.NewMemMapFs()
+
+	fs.Mkdir("/home/user", 0o777)
+	f, _ := fs.Create("/home/user/myapp.yaml")
+	f.WriteString("foo: bar")
+	f.Close()
+
+	fs.Mkdir("/etc/myapp", 0o777)
+	fs.Create("/etc/myapp/config.yaml")
+
+	// Combine multiple finders to search for files in multiple locations with different criteria
+	finder := viper.Finders(
+		locafero.Finder{
+			Paths: []string{"/home/user"},
+			Names: locafero.NameWithExtensions("myapp", viper.SupportedExts...),
+			Type:  locafero.FileTypeFile, // This is important!
+		},
+		locafero.Finder{
+			Paths: []string{"/etc/myapp"},
+			Names: []string{"config.yaml"}, // Only accept YAML files in the system config directory
+			Type:  locafero.FileTypeFile,   // This is important!
+		},
+	)
+
+	v := viper.NewWithOptions(viper.WithFinder(finder))
+	v.SetFs(fs)
+	v.ReadInConfig()
+
+	fmt.Println(v.GetString("foo"))
+
+	// Output:
+	// bar
+}

finder_test.go

@@ -0,0 +1,42 @@
+package viper
+
+import (
+	"testing"
+
+	"github.com/spf13/afero"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type finderStub struct {
+	results []string
+}
+
+func (f finderStub) Find(_ afero.Fs) ([]string, error) {
+	return f.results, nil
+}
+
+func TestFinders(t *testing.T) {
+	finder := Finders(
+		finderStub{
+			results: []string{
+				"/home/user/.viper.yaml",
+			},
+		},
+		finderStub{
+			results: []string{
+				"/etc/viper/config.yaml",
+			},
+		},
+	)
+
+	results, err := finder.Find(afero.NewMemMapFs())
+	require.NoError(t, err)
+
+	expected := []string{
+		"/home/user/.viper.yaml",
+		"/etc/viper/config.yaml",
+	}
+
+	assert.Equal(t, expected, results)
+}

flags.go

@@ -30,8 +30,8 @@ func (p pflagValueSet) VisitAll(fn func(flag FlagValue)) {
 	})
 }
 
-// pflagValue is a wrapper aroung *pflag.flag
-// that implements FlagValue
+// pflagValue is a wrapper around *pflag.flag
+// that implements FlagValue.
 type pflagValue struct {
 	flag *pflag.Flag
 }

flags_test.go

@@ -5,18 +5,20 @@ import (
 
 	"github.com/spf13/pflag"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestBindFlagValueSet(t *testing.T) {
+	Reset()
 	flagSet := pflag.NewFlagSet("test", pflag.ContinueOnError)
 
-	var testValues = map[string]*string{
+	testValues := map[string]*string{
 		"host":     nil,
 		"port":     nil,
 		"endpoint": nil,
 	}
 
-	var mutatedTestValues = map[string]string{
+	mutatedTestValues := map[string]string{
 		"host":     "localhost",
 		"port":     "6060",
 		"endpoint": "/public",
@@ -29,9 +31,7 @@ func TestBindFlagValueSet(t *testing.T) {
 	flagValueSet := pflagValueSet{flagSet}
 
 	err := BindFlagValues(flagValueSet)
-	if err != nil {
-		t.Fatalf("error binding flag set, %v", err)
-	}
+	require.NoError(t, err, "error binding flag set")
 
 	flagSet.VisitAll(func(flag *pflag.Flag) {
 		flag.Value.Set(mutatedTestValues[flag.Name])
@@ -39,13 +39,13 @@ func TestBindFlagValueSet(t *testing.T) {
 	})
 
 	for name, expected := range mutatedTestValues {
-		assert.Equal(t, Get(name), expected)
+		assert.Equal(t, expected, Get(name))
 	}
 }
 
 func TestBindFlagValue(t *testing.T) {
-	var testString = "testing"
-	var testValue = newStringValue(testString, &testString)
+	testString := "testing"
+	testValue := newStringValue(testString, &testString)
 
 	flag := &pflag.Flag{
 		Name:    "testflag",
@@ -59,7 +59,7 @@ func TestBindFlagValue(t *testing.T) {
 	assert.Equal(t, testString, Get("testvalue"))
 
 	flag.Value.Set("testing_mutate")
-	flag.Changed = true //hack for pflag usage
+	flag.Changed = true // hack for pflag usage
 
 	assert.Equal(t, "testing_mutate", Get("testvalue"))
 }

flake.lock

@@ -0,0 +1,472 @@
+{
+  "nodes": {
+    "cachix": {
+      "inputs": {
+        "devenv": "devenv_2",
+        "flake-compat": [
+          "devenv",
+          "flake-compat"
+        ],
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ],
+        "pre-commit-hooks": [
+          "devenv",
+          "pre-commit-hooks"
+        ]
+      },
+      "locked": {
+        "lastModified": 1712055811,
+        "narHash": "sha256-7FcfMm5A/f02yyzuavJe06zLa9hcMHsagE28ADcmQvk=",
+        "owner": "cachix",
+        "repo": "cachix",
+        "rev": "02e38da89851ec7fec3356a5c04bc8349cae0e30",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "cachix",
+        "type": "github"
+      }
+    },
+    "devenv": {
+      "inputs": {
+        "cachix": "cachix",
+        "flake-compat": "flake-compat_2",
+        "nix": "nix_2",
+        "nixpkgs": "nixpkgs_2",
+        "pre-commit-hooks": "pre-commit-hooks"
+      },
+      "locked": {
+        "lastModified": 1717245169,
+        "narHash": "sha256-+mW3rTBjGU8p1THJN0lX/Dd/8FbnF+3dB+mJuSaxewE=",
+        "owner": "cachix",
+        "repo": "devenv",
+        "rev": "c3f9f053c077c6f88a3de5276d9178c62baa3fc3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "devenv",
+        "type": "github"
+      }
+    },
+    "devenv_2": {
+      "inputs": {
+        "flake-compat": [
+          "devenv",
+          "cachix",
+          "flake-compat"
+        ],
+        "nix": "nix",
+        "nixpkgs": "nixpkgs",
+        "poetry2nix": "poetry2nix",
+        "pre-commit-hooks": [
+          "devenv",
+          "cachix",
+          "pre-commit-hooks"
+        ]
+      },
+      "locked": {
+        "lastModified": 1708704632,
+        "narHash": "sha256-w+dOIW60FKMaHI1q5714CSibk99JfYxm0CzTinYWr+Q=",
+        "owner": "cachix",
+        "repo": "devenv",
+        "rev": "2ee4450b0f4b95a1b90f2eb5ffea98b90e48c196",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "python-rewrite",
+        "repo": "devenv",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-compat_2": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1717285511,
+        "narHash": "sha256-iKzJcpdXih14qYVcZ9QC9XuZYnPc6T8YImb6dX166kw=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "2a55567fcf15b1b1c7ed712a2c6fadaec7412ea8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1689068808,
+        "narHash": "sha256-6ixXo3wt24N/melDWjq70UuHQLxGV8jZvooRanIHXw0=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "919d646de7be200f3bf08cb76ae1f09402b6f9b4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "devenv",
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nix": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "nixpkgs": [
+          "devenv",
+          "cachix",
+          "devenv",
+          "nixpkgs"
+        ],
+        "nixpkgs-regression": "nixpkgs-regression"
+      },
+      "locked": {
+        "lastModified": 1712911606,
+        "narHash": "sha256-BGvBhepCufsjcUkXnEEXhEVjwdJAwPglCC2+bInc794=",
+        "owner": "domenkozar",
+        "repo": "nix",
+        "rev": "b24a9318ea3f3600c1e24b4a00691ee912d4de12",
+        "type": "github"
+      },
+      "original": {
+        "owner": "domenkozar",
+        "ref": "devenv-2.21",
+        "repo": "nix",
+        "type": "github"
+      }
+    },
+    "nix-github-actions": {
+      "inputs": {
+        "nixpkgs": [
+          "devenv",
+          "cachix",
+          "devenv",
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1688870561,
+        "narHash": "sha256-4UYkifnPEw1nAzqqPOTL2MvWtm3sNGw1UTYTalkTcGY=",
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "rev": "165b1650b753316aa7f1787f3005a8d2da0f5301",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "type": "github"
+      }
+    },
+    "nix_2": {
+      "inputs": {
+        "flake-compat": [
+          "devenv",
+          "flake-compat"
+        ],
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ],
+        "nixpkgs-regression": "nixpkgs-regression_2"
+      },
+      "locked": {
+        "lastModified": 1712911606,
+        "narHash": "sha256-BGvBhepCufsjcUkXnEEXhEVjwdJAwPglCC2+bInc794=",
+        "owner": "domenkozar",
+        "repo": "nix",
+        "rev": "b24a9318ea3f3600c1e24b4a00691ee912d4de12",
+        "type": "github"
+      },
+      "original": {
+        "owner": "domenkozar",
+        "ref": "devenv-2.21",
+        "repo": "nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1692808169,
+        "narHash": "sha256-x9Opq06rIiwdwGeK2Ykj69dNc2IvUH1fY55Wm7atwrE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9201b5ff357e781bf014d0330d18555695df7ba8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1717284937,
+        "narHash": "sha256-lIbdfCsf8LMFloheeE6N31+BMIeixqyQWbSr2vk79EQ=",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/eb9ceca17df2ea50a250b6b27f7bf6ab0186f198.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/eb9ceca17df2ea50a250b6b27f7bf6ab0186f198.tar.gz"
+      }
+    },
+    "nixpkgs-regression": {
+      "locked": {
+        "lastModified": 1643052045,
+        "narHash": "sha256-uGJ0VXIhWKGXxkeNnq4TvV3CIOkUJ3PAoLZ3HMzNVMw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      }
+    },
+    "nixpkgs-regression_2": {
+      "locked": {
+        "lastModified": 1643052045,
+        "narHash": "sha256-uGJ0VXIhWKGXxkeNnq4TvV3CIOkUJ3PAoLZ3HMzNVMw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1710695816,
+        "narHash": "sha256-3Eh7fhEID17pv9ZxrPwCLfqXnYP006RKzSs0JptsN84=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "614b4613980a522ba49f0d194531beddbb7220d3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1713361204,
+        "narHash": "sha256-TA6EDunWTkc5FvDCqU3W2T3SFn0gRZqh6D/hJnM02MM=",
+        "owner": "cachix",
+        "repo": "devenv-nixpkgs",
+        "rev": "285676e87ad9f0ca23d8714a6ab61e7e027020c6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "rolling",
+        "repo": "devenv-nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_3": {
+      "locked": {
+        "lastModified": 1717112898,
+        "narHash": "sha256-7R2ZvOnvd9h8fDd65p0JnB7wXfUvreox3xFdYWd1BnY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "6132b0f6e344ce2fe34fc051b72fb46e34f668e0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "poetry2nix": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nix-github-actions": "nix-github-actions",
+        "nixpkgs": [
+          "devenv",
+          "cachix",
+          "devenv",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1692876271,
+        "narHash": "sha256-IXfZEkI0Mal5y1jr6IRWMqK8GW2/f28xJenZIPQqkY0=",
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "rev": "d5006be9c2c2417dafb2e2e5034d83fabd207ee3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": [
+          "devenv",
+          "flake-compat"
+        ],
+        "flake-utils": "flake-utils_2",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1713775815,
+        "narHash": "sha256-Wu9cdYTnGQQwtT20QQMg7jzkANKQjwBD9iccfGKkfls=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "2ac4dcbf55ed43f3be0bae15e181f08a57af24a4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "devenv": "devenv",
+        "flake-parts": "flake-parts",
+        "nixpkgs": "nixpkgs_3"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,57 @@
+{
+  description = "Viper";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    devenv.url = "github:cachix/devenv";
+  };
+
+  outputs = inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      imports = [
+        inputs.devenv.flakeModule
+      ];
+
+      systems = [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" ];
+
+      perSystem = { config, self', inputs', pkgs, system, ... }: rec {
+        devenv.shells = {
+          default = {
+            languages = {
+              go.enable = true;
+              go.package = pkgs.go_1_22;
+            };
+
+            pre-commit.hooks = {
+              nixpkgs-fmt.enable = true;
+              yamllint.enable = true;
+            };
+
+            packages = with pkgs; [
+              gnumake
+
+              golangci-lint
+              yamllint
+            ];
+
+            scripts = {
+              versions.exec = ''
+                go version
+                golangci-lint version
+              '';
+            };
+
+            enterShell = ''
+              versions
+            '';
+
+            # https://github.com/cachix/devenv/issues/528#issuecomment-1556108767
+            containers = pkgs.lib.mkForce { };
+          };
+
+          ci = devenv.shells.default;
+        };
+      };
+    };
+}

go.mod

@@ -1,48 +1,27 @@
 module github.com/spf13/viper
 
-go 1.12
+go 1.21
 
 require (
-	github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6 // indirect
-	github.com/coreos/bbolt v1.3.2 // indirect
-	github.com/coreos/etcd v3.3.10+incompatible // indirect
-	github.com/coreos/go-semver v0.2.0 // indirect
-	github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e // indirect
-	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
-	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
-	github.com/fsnotify/fsnotify v1.4.7
-	github.com/gogo/protobuf v1.2.1 // indirect
-	github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef // indirect
-	github.com/google/btree v1.0.0 // indirect
-	github.com/gorilla/websocket v1.4.0 // indirect
-	github.com/grpc-ecosystem/go-grpc-middleware v1.0.0 // indirect
-	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
-	github.com/grpc-ecosystem/grpc-gateway v1.9.0 // indirect
-	github.com/hashicorp/hcl v1.0.0
-	github.com/jonboulle/clockwork v0.1.0 // indirect
-	github.com/magiconair/properties v1.8.1
-	github.com/mitchellh/mapstructure v1.1.2
-	github.com/pelletier/go-toml v1.2.0
-	github.com/prometheus/client_golang v0.9.3 // indirect
-	github.com/smartystreets/goconvey v1.6.4 // indirect
-	github.com/soheilhy/cmux v0.1.4 // indirect
-	github.com/spf13/afero v1.1.2
-	github.com/spf13/cast v1.3.0
-	github.com/spf13/jwalterweatherman v1.0.0
-	github.com/spf13/pflag v1.0.3
-	github.com/stretchr/testify v1.2.2
-	github.com/subosito/gotenv v1.2.0
-	github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5 // indirect
-	github.com/ugorji/go v1.1.4 // indirect
-	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
-	github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77
-	go.etcd.io/bbolt v1.3.2 // indirect
-	go.uber.org/atomic v1.4.0 // indirect
-	go.uber.org/multierr v1.1.0 // indirect
-	go.uber.org/zap v1.10.0 // indirect
-	golang.org/x/net v0.0.0-20190522155817-f3200d17e092 // indirect
-	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
-	google.golang.org/grpc v1.21.0 // indirect
-	gopkg.in/ini.v1 v1.51.0
-	gopkg.in/yaml.v2 v2.2.4
+	github.com/fsnotify/fsnotify v1.7.0
+	github.com/go-viper/mapstructure/v2 v2.0.0
+	github.com/pelletier/go-toml/v2 v2.2.2
+	github.com/sagikazarmark/locafero v0.6.0
+	github.com/spf13/afero v1.11.0
+	github.com/spf13/cast v1.6.0
+	github.com/spf13/pflag v1.0.5
+	github.com/stretchr/testify v1.9.0
+	github.com/subosito/gotenv v1.6.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
 )

go.sum

@@ -1,192 +1,57 @@
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internal/encoding/decoder.go

@@ -0,0 +1,61 @@
+package encoding
+
+import (
+	"sync"
+)
+
+// Decoder decodes the contents of b into v.
+// It's primarily used for decoding contents of a file into a map[string]any.
+type Decoder interface {
+	Decode(b []byte, v map[string]any) error
+}
+
+const (
+	// ErrDecoderNotFound is returned when there is no decoder registered for a format.
+	ErrDecoderNotFound = encodingError("decoder not found for this format")
+
+	// ErrDecoderFormatAlreadyRegistered is returned when an decoder is already registered for a format.
+	ErrDecoderFormatAlreadyRegistered = encodingError("decoder already registered for this format")
+)
+
+// DecoderRegistry can choose an appropriate Decoder based on the provided format.
+type DecoderRegistry struct {
+	decoders map[string]Decoder
+
+	mu sync.RWMutex
+}
+
+// NewDecoderRegistry returns a new, initialized DecoderRegistry.
+func NewDecoderRegistry() *DecoderRegistry {
+	return &DecoderRegistry{
+		decoders: make(map[string]Decoder),
+	}
+}
+
+// RegisterDecoder registers a Decoder for a format.
+// Registering a Decoder for an already existing format is not supported.
+func (e *DecoderRegistry) RegisterDecoder(format string, enc Decoder) error {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	if _, ok := e.decoders[format]; ok {
+		return ErrDecoderFormatAlreadyRegistered
+	}
+
+	e.decoders[format] = enc
+
+	return nil
+}
+
+// Decode calls the underlying Decoder based on the format.
+func (e *DecoderRegistry) Decode(format string, b []byte, v map[string]any) error {
+	e.mu.RLock()
+	decoder, ok := e.decoders[format]
+	e.mu.RUnlock()
+
+	if !ok {
+		return ErrDecoderNotFound
+	}
+
+	return decoder.Decode(b, v)
+}

internal/encoding/decoder_test.go

@@ -0,0 +1,69 @@
+package encoding
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type decoder struct {
+	v map[string]any
+}
+
+func (d decoder) Decode(_ []byte, v map[string]any) error {
+	for key, value := range d.v {
+		v[key] = value
+	}
+
+	return nil
+}
+
+func TestDecoderRegistry_RegisterDecoder(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		registry := NewDecoderRegistry()
+
+		err := registry.RegisterDecoder("myformat", decoder{})
+		require.NoError(t, err)
+	})
+
+	t.Run("AlreadyRegistered", func(t *testing.T) {
+		registry := NewDecoderRegistry()
+
+		err := registry.RegisterDecoder("myformat", decoder{})
+		require.NoError(t, err)
+
+		err = registry.RegisterDecoder("myformat", decoder{})
+		assert.ErrorIs(t, err, ErrDecoderFormatAlreadyRegistered)
+	})
+}
+
+func TestDecoderRegistry_Decode(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		registry := NewDecoderRegistry()
+		decoder := decoder{
+			v: map[string]any{
+				"key": "value",
+			},
+		}
+
+		err := registry.RegisterDecoder("myformat", decoder)
+		require.NoError(t, err)
+
+		v := map[string]any{}
+
+		err = registry.Decode("myformat", []byte("key: value"), v)
+		require.NoError(t, err)
+
+		assert.Equal(t, decoder.v, v)
+	})
+
+	t.Run("DecoderNotFound", func(t *testing.T) {
+		registry := NewDecoderRegistry()
+
+		v := map[string]any{}
+
+		err := registry.Decode("myformat", nil, v)
+		assert.ErrorIs(t, err, ErrDecoderNotFound)
+	})
+}

internal/encoding/dotenv/codec.go

@@ -0,0 +1,61 @@
+package dotenv
+
+import (
+	"bytes"
+	"fmt"
+	"sort"
+	"strings"
+
+	"github.com/subosito/gotenv"
+)
+
+const keyDelimiter = "_"
+
+// Codec implements the encoding.Encoder and encoding.Decoder interfaces for encoding data containing environment variables
+// (commonly called as dotenv format).
+type Codec struct{}
+
+func (Codec) Encode(v map[string]any) ([]byte, error) {
+	flattened := map[string]any{}
+
+	flattened = flattenAndMergeMap(flattened, v, "", keyDelimiter)
+
+	keys := make([]string, 0, len(flattened))
+
+	for key := range flattened {
+		keys = append(keys, key)
+	}
+
+	sort.Strings(keys)
+
+	var buf bytes.Buffer
+
+	for _, key := range keys {
+		_, err := buf.WriteString(fmt.Sprintf("%v=%v\n", strings.ToUpper(key), flattened[key]))
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return buf.Bytes(), nil
+}
+
+func (Codec) Decode(b []byte, v map[string]any) error {
+	var buf bytes.Buffer
+
+	_, err := buf.Write(b)
+	if err != nil {
+		return err
+	}
+
+	env, err := gotenv.StrictParse(&buf)
+	if err != nil {
+		return err
+	}
+
+	for key, value := range env {
+		v[key] = value
+	}
+
+	return nil
+}

internal/encoding/dotenv/codec_test.go

@@ -0,0 +1,55 @@
+package dotenv
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// original form of the data.
+const original = `# key-value pair
+KEY=value
+`
+
+// encoded form of the data.
+const encoded = `KEY=value
+`
+
+// data is Viper's internal representation.
+var data = map[string]any{
+	"KEY": "value",
+}
+
+func TestCodec_Encode(t *testing.T) {
+	codec := Codec{}
+
+	b, err := codec.Encode(data)
+	require.NoError(t, err)
+
+	assert.Equal(t, encoded, string(b))
+}
+
+func TestCodec_Decode(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		codec := Codec{}
+
+		v := map[string]any{}
+
+		err := codec.Decode([]byte(original), v)
+		require.NoError(t, err)
+
+		assert.Equal(t, data, v)
+	})
+
+	t.Run("InvalidData", func(t *testing.T) {
+		codec := Codec{}
+
+		v := map[string]any{}
+
+		err := codec.Decode([]byte(`invalid data`), v)
+		require.Error(t, err)
+
+		t.Logf("decoding failed as expected: %s", err)
+	})
+}

internal/encoding/dotenv/map_utils.go

@@ -0,0 +1,41 @@
+package dotenv
+
+import (
+	"strings"
+
+	"github.com/spf13/cast"
+)
+
+// flattenAndMergeMap recursively flattens the given map into a new map
+// Code is based on the function with the same name in the main package.
+// TODO: move it to a common place.
+func flattenAndMergeMap(shadow, m map[string]any, prefix, delimiter string) map[string]any {
+	if shadow != nil && prefix != "" && shadow[prefix] != nil {
+		// prefix is shadowed => nothing more to flatten
+		return shadow
+	}
+	if shadow == nil {
+		shadow = make(map[string]any)
+	}
+
+	var m2 map[string]any
+	if prefix != "" {
+		prefix += delimiter
+	}
+	for k, val := range m {
+		fullKey := prefix + k
+		switch val := val.(type) {
+		case map[string]any:
+			m2 = val
+		case map[any]any:
+			m2 = cast.ToStringMap(val)
+		default:
+			// immediate value
+			shadow[strings.ToLower(fullKey)] = val
+			continue
+		}
+		// recursively merge to shadow map
+		shadow = flattenAndMergeMap(shadow, m2, fullKey, delimiter)
+	}
+	return shadow
+}

internal/encoding/encoder.go

@@ -0,0 +1,60 @@
+package encoding
+
+import (
+	"sync"
+)
+
+// Encoder encodes the contents of v into a byte representation.
+// It's primarily used for encoding a map[string]any into a file format.
+type Encoder interface {
+	Encode(v map[string]any) ([]byte, error)
+}
+
+const (
+	// ErrEncoderNotFound is returned when there is no encoder registered for a format.
+	ErrEncoderNotFound = encodingError("encoder not found for this format")
+
+	// ErrEncoderFormatAlreadyRegistered is returned when an encoder is already registered for a format.
+	ErrEncoderFormatAlreadyRegistered = encodingError("encoder already registered for this format")
+)
+
+// EncoderRegistry can choose an appropriate Encoder based on the provided format.
+type EncoderRegistry struct {
+	encoders map[string]Encoder
+
+	mu sync.RWMutex
+}
+
+// NewEncoderRegistry returns a new, initialized EncoderRegistry.
+func NewEncoderRegistry() *EncoderRegistry {
+	return &EncoderRegistry{
+		encoders: make(map[string]Encoder),
+	}
+}
+
+// RegisterEncoder registers an Encoder for a format.
+// Registering a Encoder for an already existing format is not supported.
+func (e *EncoderRegistry) RegisterEncoder(format string, enc Encoder) error {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	if _, ok := e.encoders[format]; ok {
+		return ErrEncoderFormatAlreadyRegistered
+	}
+
+	e.encoders[format] = enc
+
+	return nil
+}
+
+func (e *EncoderRegistry) Encode(format string, v map[string]any) ([]byte, error) {
+	e.mu.RLock()
+	encoder, ok := e.encoders[format]
+	e.mu.RUnlock()
+
+	if !ok {
+		return nil, ErrEncoderNotFound
+	}
+
+	return encoder.Encode(v)
+}

internal/encoding/encoder_test.go

@@ -0,0 +1,59 @@
+package encoding
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type encoder struct {
+	b []byte
+}
+
+func (e encoder) Encode(_ map[string]any) ([]byte, error) {
+	return e.b, nil
+}
+
+func TestEncoderRegistry_RegisterEncoder(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		registry := NewEncoderRegistry()
+
+		err := registry.RegisterEncoder("myformat", encoder{})
+		require.NoError(t, err)
+	})
+
+	t.Run("AlreadyRegistered", func(t *testing.T) {
+		registry := NewEncoderRegistry()
+
+		err := registry.RegisterEncoder("myformat", encoder{})
+		require.NoError(t, err)
+
+		err = registry.RegisterEncoder("myformat", encoder{})
+		assert.ErrorIs(t, err, ErrEncoderFormatAlreadyRegistered)
+	})
+}
+
+func TestEncoderRegistry_Decode(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		registry := NewEncoderRegistry()
+		encoder := encoder{
+			b: []byte("key: value"),
+		}
+
+		err := registry.RegisterEncoder("myformat", encoder)
+		require.NoError(t, err)
+
+		b, err := registry.Encode("myformat", map[string]any{"key": "value"})
+		require.NoError(t, err)
+
+		assert.Equal(t, "key: value", string(b))
+	})
+
+	t.Run("EncoderNotFound", func(t *testing.T) {
+		registry := NewEncoderRegistry()
+
+		_, err := registry.Encode("myformat", map[string]any{"key": "value"})
+		assert.ErrorIs(t, err, ErrEncoderNotFound)
+	})
+}

internal/encoding/error.go

@@ -0,0 +1,7 @@
+package encoding
+
+type encodingError string
+
+func (e encodingError) Error() string {
+	return string(e)
+}

internal/encoding/json/codec.go

@@ -0,0 +1,17 @@
+package json
+
+import (
+	"encoding/json"
+)
+
+// Codec implements the encoding.Encoder and encoding.Decoder interfaces for JSON encoding.
+type Codec struct{}
+
+func (Codec) Encode(v map[string]any) ([]byte, error) {
+	// TODO: expose prefix and indent in the Codec as setting?
+	return json.MarshalIndent(v, "", "  ")
+}
+
+func (Codec) Decode(b []byte, v map[string]any) error {
+	return json.Unmarshal(b, &v)
+}

internal/encoding/json/codec_test.go

@@ -0,0 +1,87 @@
+package json
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// encoded form of the data.
+const encoded = `{
+  "key": "value",
+  "list": [
+    "item1",
+    "item2",
+    "item3"
+  ],
+  "map": {
+    "key": "value"
+  },
+  "nested_map": {
+    "map": {
+      "key": "value",
+      "list": [
+        "item1",
+        "item2",
+        "item3"
+      ]
+    }
+  }
+}`
+
+// data is Viper's internal representation.
+var data = map[string]any{
+	"key": "value",
+	"list": []any{
+		"item1",
+		"item2",
+		"item3",
+	},
+	"map": map[string]any{
+		"key": "value",
+	},
+	"nested_map": map[string]any{
+		"map": map[string]any{
+			"key": "value",
+			"list": []any{
+				"item1",
+				"item2",
+				"item3",
+			},
+		},
+	},
+}
+
+func TestCodec_Encode(t *testing.T) {
+	codec := Codec{}
+
+	b, err := codec.Encode(data)
+	require.NoError(t, err)
+
+	assert.Equal(t, encoded, string(b))
+}
+
+func TestCodec_Decode(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		codec := Codec{}
+
+		v := map[string]any{}
+
+		err := codec.Decode([]byte(encoded), v)
+		require.NoError(t, err)
+
+		assert.Equal(t, data, v)
+	})
+
+	t.Run("InvalidData", func(t *testing.T) {
+		codec := Codec{}
+
+		v := map[string]any{}
+
+		err := codec.Decode([]byte(`invalid data`), v)
+		require.Error(t, err)
+
+		t.Logf("decoding failed as expected: %s", err)
+	})
+}

internal/encoding/toml/codec.go

@@ -0,0 +1,16 @@
+package toml
+
+import (
+	"github.com/pelletier/go-toml/v2"
+)
+
+// Codec implements the encoding.Encoder and encoding.Decoder interfaces for TOML encoding.
+type Codec struct{}
+
+func (Codec) Encode(v map[string]any) ([]byte, error) {
+	return toml.Marshal(v)
+}
+
+func (Codec) Decode(b []byte, v map[string]any) error {
+	return toml.Unmarshal(b, &v)
+}

internal/encoding/toml/codec_test.go

@@ -0,0 +1,97 @@
+package toml
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// original form of the data.
+const original = `# key-value pair
+key = "value"
+list = ["item1", "item2", "item3"]
+
+[map]
+key = "value"
+
+# nested
+# map
+[nested_map]
+[nested_map.map]
+key = "value"
+list = [
+  "item1",
+  "item2",
+  "item3",
+]
+`
+
+// encoded form of the data.
+const encoded = `key = 'value'
+list = ['item1', 'item2', 'item3']
+
+[map]
+key = 'value'
+
+[nested_map]
+[nested_map.map]
+key = 'value'
+list = ['item1', 'item2', 'item3']
+`
+
+// data is Viper's internal representation.
+var data = map[string]any{
+	"key": "value",
+	"list": []any{
+		"item1",
+		"item2",
+		"item3",
+	},
+	"map": map[string]any{
+		"key": "value",
+	},
+	"nested_map": map[string]any{
+		"map": map[string]any{
+			"key": "value",
+			"list": []any{
+				"item1",
+				"item2",
+				"item3",
+			},
+		},
+	},
+}
+
+func TestCodec_Encode(t *testing.T) {
+	codec := Codec{}
+
+	b, err := codec.Encode(data)
+	require.NoError(t, err)
+
+	assert.Equal(t, encoded, string(b))
+}
+
+func TestCodec_Decode(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		codec := Codec{}
+
+		v := map[string]any{}
+
+		err := codec.Decode([]byte(original), v)
+		require.NoError(t, err)
+
+		assert.Equal(t, data, v)
+	})
+
+	t.Run("InvalidData", func(t *testing.T) {
+		codec := Codec{}
+
+		v := map[string]any{}
+
+		err := codec.Decode([]byte(`invalid data`), v)
+		require.Error(t, err)
+
+		t.Logf("decoding failed as expected: %s", err)
+	})
+}

internal/encoding/yaml/codec.go

@@ -0,0 +1,14 @@
+package yaml
+
+import "gopkg.in/yaml.v3"
+
+// Codec implements the encoding.Encoder and encoding.Decoder interfaces for YAML encoding.
+type Codec struct{}
+
+func (Codec) Encode(v map[string]any) ([]byte, error) {
+	return yaml.Marshal(v)
+}
+
+func (Codec) Decode(b []byte, v map[string]any) error {
+	return yaml.Unmarshal(b, &v)
+}

internal/encoding/yaml/codec_test.go

@@ -0,0 +1,128 @@
+package yaml
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// original form of the data.
+const original = `# key-value pair
+key: value
+list:
+    - item1
+    - item2
+    - item3
+map:
+    key: value
+
+# nested
+# map
+nested_map:
+    map:
+        key: value
+        list:
+            - item1
+            - item2
+            - item3
+`
+
+// encoded form of the data.
+const encoded = `key: value
+list:
+    - item1
+    - item2
+    - item3
+map:
+    key: value
+nested_map:
+    map:
+        key: value
+        list:
+            - item1
+            - item2
+            - item3
+`
+
+// decoded form of the data.
+//
+// In case of YAML it's slightly different from Viper's internal representation
+// (e.g. map is decoded into a map with interface key).
+var decoded = map[string]any{
+	"key": "value",
+	"list": []any{
+		"item1",
+		"item2",
+		"item3",
+	},
+	"map": map[string]any{
+		"key": "value",
+	},
+	"nested_map": map[string]any{
+		"map": map[string]any{
+			"key": "value",
+			"list": []any{
+				"item1",
+				"item2",
+				"item3",
+			},
+		},
+	},
+}
+
+// data is Viper's internal representation.
+var data = map[string]any{
+	"key": "value",
+	"list": []any{
+		"item1",
+		"item2",
+		"item3",
+	},
+	"map": map[string]any{
+		"key": "value",
+	},
+	"nested_map": map[string]any{
+		"map": map[string]any{
+			"key": "value",
+			"list": []any{
+				"item1",
+				"item2",
+				"item3",
+			},
+		},
+	},
+}
+
+func TestCodec_Encode(t *testing.T) {
+	codec := Codec{}
+
+	b, err := codec.Encode(data)
+	require.NoError(t, err)
+
+	assert.Equal(t, encoded, string(b))
+}
+
+func TestCodec_Decode(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		codec := Codec{}
+
+		v := map[string]any{}
+
+		err := codec.Decode([]byte(original), v)
+		require.NoError(t, err)
+
+		assert.Equal(t, decoded, v)
+	})
+
+	t.Run("InvalidData", func(t *testing.T) {
+		codec := Codec{}
+
+		v := map[string]any{}
+
+		err := codec.Decode([]byte(`invalid data`), v)
+		require.Error(t, err)
+
+		t.Logf("decoding failed as expected: %s", err)
+	})
+}

internal/features/bind_struct.go

@@ -0,0 +1,5 @@
+//go:build viper_bind_struct
+
+package features
+
+const BindStruct = true

internal/features/bind_struct_default.go

@@ -0,0 +1,5 @@
+//go:build !viper_bind_struct
+
+package features
+
+const BindStruct = false

internal/features/finder.go

@@ -0,0 +1,5 @@
+//go:build viper_finder
+
+package features
+
+const Finder = true

internal/features/finder_default.go

@@ -0,0 +1,5 @@
+//go:build !viper_finder
+
+package features
+
+const Finder = false

internal/testutil/filepath.go

@@ -0,0 +1,18 @@
+package testutil
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+// AbsFilePath calls filepath.Abs on path.
+func AbsFilePath(t *testing.T, path string) string {
+	t.Helper()
+
+	s, err := filepath.Abs(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	return s
+}

logger.go

@@ -0,0 +1,31 @@
+package viper
+
+import (
+	"context"
+	"log/slog"
+)
+
+// WithLogger sets a custom logger.
+func WithLogger(l *slog.Logger) Option {
+	return optionFunc(func(v *Viper) {
+		v.logger = l
+	})
+}
+
+type discardHandler struct{}
+
+func (n *discardHandler) Enabled(_ context.Context, _ slog.Level) bool {
+	return false
+}
+
+func (n *discardHandler) Handle(_ context.Context, _ slog.Record) error {
+	return nil
+}
+
+func (n *discardHandler) WithAttrs(_ []slog.Attr) slog.Handler {
+	return n
+}
+
+func (n *discardHandler) WithGroup(_ string) slog.Handler {
+	return n
+}

overrides_test.go

@@ -1,7 +1,6 @@
 package viper
 
 import (
-	"fmt"
 	"strings"
 	"testing"
 
@@ -46,11 +45,11 @@ func TestNestedOverrides(t *testing.T) {
 	deepCheckValue(assert, v, overrideLayer, []string{"tom", "size"}, 4)
 
 	// Case 4: key:value overridden by a map
-	v = overrideDefault(assert, "tom.size", 4, "tom", map[string]interface{}{"age": 10}) // "tom.size" is first given "4" as default value, then "tom" is overridden by map{"age":10}
-	assert.Equal(4, v.Get("tom.size"))                                                   // "tom.size" should still be reachable
-	assert.Equal(10, v.Get("tom.age"))                                                   // new value should be there
-	deepCheckValue(assert, v, overrideLayer, []string{"tom", "age"}, 10)                 // new value should be there
-	v = override(assert, "tom.size", 4, "tom", map[string]interface{}{"age": 10})
+	v = overrideDefault(assert, "tom.size", 4, "tom", map[string]any{"age": 10}) // "tom.size" is first given "4" as default value, then "tom" is overridden by map{"age":10}
+	assert.Equal(4, v.Get("tom.size"))                                           // "tom.size" should still be reachable
+	assert.Equal(10, v.Get("tom.age"))                                           // new value should be there
+	deepCheckValue(assert, v, overrideLayer, []string{"tom", "age"}, 10)         // new value should be there
+	v = override(assert, "tom.size", 4, "tom", map[string]any{"age": 10})
 	assert.Nil(v.Get("tom.size"))
 	assert.Equal(10, v.Get("tom.age"))
 	deepCheckValue(assert, v, overrideLayer, []string{"tom", "age"}, 10)
@@ -75,10 +74,11 @@ func TestNestedOverrides(t *testing.T) {
 	}
 }
 
-func overrideDefault(assert *assert.Assertions, firstPath string, firstValue interface{}, secondPath string, secondValue interface{}) *Viper {
+func overrideDefault(assert *assert.Assertions, firstPath string, firstValue any, secondPath string, secondValue any) *Viper {
 	return overrideFromLayer(defaultLayer, assert, firstPath, firstValue, secondPath, secondValue)
 }
-func override(assert *assert.Assertions, firstPath string, firstValue interface{}, secondPath string, secondValue interface{}) *Viper {
+
+func override(assert *assert.Assertions, firstPath string, firstValue any, secondPath string, secondValue any) *Viper {
 	return overrideFromLayer(overrideLayer, assert, firstPath, firstValue, secondPath, secondValue)
 }
 
@@ -93,11 +93,11 @@ func override(assert *assert.Assertions, firstPath string, firstValue interface{
 //
 // After each assignment, the value is checked, retrieved both by its full path
 // and by its key sequence (successive maps).
-func overrideFromLayer(l layer, assert *assert.Assertions, firstPath string, firstValue interface{}, secondPath string, secondValue interface{}) *Viper {
+func overrideFromLayer(l layer, assert *assert.Assertions, firstPath string, firstValue any, secondPath string, secondValue any) *Viper {
 	v := New()
 	firstKeys := strings.Split(firstPath, v.keyDelim)
 	if assert == nil ||
-		len(firstKeys) == 0 || len(firstKeys[0]) == 0 {
+		len(firstKeys) == 0 || firstKeys[0] == "" {
 		return v
 	}
 
@@ -115,7 +115,7 @@ func overrideFromLayer(l layer, assert *assert.Assertions, firstPath string, fir
 
 	// Override and check new value
 	secondKeys := strings.Split(secondPath, v.keyDelim)
-	if len(secondKeys) == 0 || len(secondKeys[0]) == 0 {
+	if len(secondKeys) == 0 || secondKeys[0] == "" {
 		return v
 	}
 	v.Set(secondPath, secondValue)
@@ -126,15 +126,15 @@ func overrideFromLayer(l layer, assert *assert.Assertions, firstPath string, fir
 }
 
 // deepCheckValue checks that all given keys correspond to a valid path in the
-// configuration map of the given layer, and that the final value equals the one given
-func deepCheckValue(assert *assert.Assertions, v *Viper, l layer, keys []string, value interface{}) {
+// configuration map of the given layer, and that the final value equals the one given.
+func deepCheckValue(assert *assert.Assertions, v *Viper, l layer, keys []string, value any) {
 	if assert == nil || v == nil ||
-		len(keys) == 0 || len(keys[0]) == 0 {
+		len(keys) == 0 || keys[0] == "" {
 		return
 	}
 
 	// init
-	var val interface{}
+	var val any
 	var ms string
 	switch l {
 	case defaultLayer:
@@ -146,28 +146,25 @@ func deepCheckValue(assert *assert.Assertions, v *Viper, l layer, keys []string,
 	}
 
 	// loop through map
-	var m map[string]interface{}
-	err := false
+	var m map[string]any
 	for _, k := range keys {
 		if val == nil {
-			assert.Fail(fmt.Sprintf("%s is not a map[string]interface{}", ms))
+			assert.Failf("%s is not a map[string]any", ms)
 			return
 		}
 
 		// deep scan of the map to get the final value
-		switch val.(type) {
-		case map[interface{}]interface{}:
+		switch val := val.(type) {
+		case map[any]any:
 			m = cast.ToStringMap(val)
-		case map[string]interface{}:
-			m = val.(map[string]interface{})
+		case map[string]any:
+			m = val
 		default:
-			assert.Fail(fmt.Sprintf("%s is not a map[string]interface{}", ms))
+			assert.Failf("%s is not a map[string]any", ms)
 			return
 		}
 		ms = ms + "[\"" + k + "\"]"
 		val = m[k]
 	}
-	if !err {
-		assert.Equal(value, val)
-	}
+	assert.Equal(value, val)
 }

remote.go

@@ -0,0 +1,255 @@
+package viper
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"reflect"
+)
+
+// SupportedRemoteProviders are universally supported remote providers.
+var SupportedRemoteProviders = []string{"etcd", "etcd3", "consul", "firestore", "nats"}
+
+func resetRemote() {
+	SupportedRemoteProviders = []string{"etcd", "etcd3", "consul", "firestore", "nats"}
+}
+
+type remoteConfigFactory interface {
+	Get(rp RemoteProvider) (io.Reader, error)
+	Watch(rp RemoteProvider) (io.Reader, error)
+	WatchChannel(rp RemoteProvider) (<-chan *RemoteResponse, chan bool)
+}
+
+type RemoteResponse struct {
+	Value []byte
+	Error error
+}
+
+// RemoteConfig is optional, see the remote package.
+var RemoteConfig remoteConfigFactory
+
+// UnsupportedRemoteProviderError denotes encountering an unsupported remote
+// provider. Currently only etcd and Consul are supported.
+type UnsupportedRemoteProviderError string
+
+// Error returns the formatted remote provider error.
+func (str UnsupportedRemoteProviderError) Error() string {
+	return fmt.Sprintf("Unsupported Remote Provider Type %q", string(str))
+}
+
+// RemoteConfigError denotes encountering an error while trying to
+// pull the configuration from the remote provider.
+type RemoteConfigError string
+
+// Error returns the formatted remote provider error.
+func (rce RemoteConfigError) Error() string {
+	return fmt.Sprintf("Remote Configurations Error: %s", string(rce))
+}
+
+type defaultRemoteProvider struct {
+	provider      string
+	endpoint      string
+	path          string
+	secretKeyring string
+}
+
+func (rp defaultRemoteProvider) Provider() string {
+	return rp.provider
+}
+
+func (rp defaultRemoteProvider) Endpoint() string {
+	return rp.endpoint
+}
+
+func (rp defaultRemoteProvider) Path() string {
+	return rp.path
+}
+
+func (rp defaultRemoteProvider) SecretKeyring() string {
+	return rp.secretKeyring
+}
+
+// RemoteProvider stores the configuration necessary
+// to connect to a remote key/value store.
+// Optional secretKeyring to unencrypt encrypted values
+// can be provided.
+type RemoteProvider interface {
+	Provider() string
+	Endpoint() string
+	Path() string
+	SecretKeyring() string
+}
+
+// AddRemoteProvider adds a remote configuration source.
+// Remote Providers are searched in the order they are added.
+// provider is a string value: "etcd", "etcd3", "consul", "firestore" or "nats" are currently supported.
+// endpoint is the url.  etcd requires http://ip:port, consul requires ip:port, nats requires nats://ip:port
+// path is the path in the k/v store to retrieve configuration
+// To retrieve a config file called myapp.json from /configs/myapp.json
+// you should set path to /configs and set config name (SetConfigName()) to
+// "myapp".
+func AddRemoteProvider(provider, endpoint, path string) error {
+	return v.AddRemoteProvider(provider, endpoint, path)
+}
+
+func (v *Viper) AddRemoteProvider(provider, endpoint, path string) error {
+	if !stringInSlice(provider, SupportedRemoteProviders) {
+		return UnsupportedRemoteProviderError(provider)
+	}
+	if provider != "" && endpoint != "" {
+		v.logger.Info("adding remote provider", "provider", provider, "endpoint", endpoint)
+
+		rp := &defaultRemoteProvider{
+			endpoint: endpoint,
+			provider: provider,
+			path:     path,
+		}
+		if !v.providerPathExists(rp) {
+			v.remoteProviders = append(v.remoteProviders, rp)
+		}
+	}
+	return nil
+}
+
+// AddSecureRemoteProvider adds a remote configuration source.
+// Secure Remote Providers are searched in the order they are added.
+// provider is a string value: "etcd", "etcd3", "consul", "firestore" or "nats" are currently supported.
+// endpoint is the url.  etcd requires http://ip:port  consul requires ip:port
+// secretkeyring is the filepath to your openpgp secret keyring.  e.g. /etc/secrets/myring.gpg
+// path is the path in the k/v store to retrieve configuration
+// To retrieve a config file called myapp.json from /configs/myapp.json
+// you should set path to /configs and set config name (SetConfigName()) to
+// "myapp".
+// Secure Remote Providers are implemented with github.com/sagikazarmark/crypt.
+func AddSecureRemoteProvider(provider, endpoint, path, secretkeyring string) error {
+	return v.AddSecureRemoteProvider(provider, endpoint, path, secretkeyring)
+}
+
+func (v *Viper) AddSecureRemoteProvider(provider, endpoint, path, secretkeyring string) error {
+	if !stringInSlice(provider, SupportedRemoteProviders) {
+		return UnsupportedRemoteProviderError(provider)
+	}
+	if provider != "" && endpoint != "" {
+		v.logger.Info("adding remote provider", "provider", provider, "endpoint", endpoint)
+
+		rp := &defaultRemoteProvider{
+			endpoint:      endpoint,
+			provider:      provider,
+			path:          path,
+			secretKeyring: secretkeyring,
+		}
+		if !v.providerPathExists(rp) {
+			v.remoteProviders = append(v.remoteProviders, rp)
+		}
+	}
+	return nil
+}
+
+func (v *Viper) providerPathExists(p *defaultRemoteProvider) bool {
+	for _, y := range v.remoteProviders {
+		if reflect.DeepEqual(y, p) {
+			return true
+		}
+	}
+	return false
+}
+
+// ReadRemoteConfig attempts to get configuration from a remote source
+// and read it in the remote configuration registry.
+func ReadRemoteConfig() error { return v.ReadRemoteConfig() }
+
+func (v *Viper) ReadRemoteConfig() error {
+	return v.getKeyValueConfig()
+}
+
+func WatchRemoteConfig() error { return v.WatchRemoteConfig() }
+func (v *Viper) WatchRemoteConfig() error {
+	return v.watchKeyValueConfig()
+}
+
+func (v *Viper) WatchRemoteConfigOnChannel() error {
+	return v.watchKeyValueConfigOnChannel()
+}
+
+// Retrieve the first found remote configuration.
+func (v *Viper) getKeyValueConfig() error {
+	if RemoteConfig == nil {
+		return RemoteConfigError("Enable the remote features by doing a blank import of the viper/remote package: '_ github.com/spf13/viper/remote'")
+	}
+
+	if len(v.remoteProviders) == 0 {
+		return RemoteConfigError("No Remote Providers")
+	}
+
+	for _, rp := range v.remoteProviders {
+		val, err := v.getRemoteConfig(rp)
+		if err != nil {
+			v.logger.Error(fmt.Errorf("get remote config: %w", err).Error())
+
+			continue
+		}
+
+		v.kvstore = val
+
+		return nil
+	}
+	return RemoteConfigError("No Files Found")
+}
+
+func (v *Viper) getRemoteConfig(provider RemoteProvider) (map[string]any, error) {
+	reader, err := RemoteConfig.Get(provider)
+	if err != nil {
+		return nil, err
+	}
+	err = v.unmarshalReader(reader, v.kvstore)
+	return v.kvstore, err
+}
+
+// Retrieve the first found remote configuration.
+func (v *Viper) watchKeyValueConfigOnChannel() error {
+	if len(v.remoteProviders) == 0 {
+		return RemoteConfigError("No Remote Providers")
+	}
+
+	for _, rp := range v.remoteProviders {
+		respc, _ := RemoteConfig.WatchChannel(rp)
+		// Todo: Add quit channel
+		go func(rc <-chan *RemoteResponse) {
+			for {
+				b := <-rc
+				reader := bytes.NewReader(b.Value)
+				v.unmarshalReader(reader, v.kvstore)
+			}
+		}(respc)
+		return nil
+	}
+	return RemoteConfigError("No Files Found")
+}
+
+// Retrieve the first found remote configuration.
+func (v *Viper) watchKeyValueConfig() error {
+	if len(v.remoteProviders) == 0 {
+		return RemoteConfigError("No Remote Providers")
+	}
+
+	for _, rp := range v.remoteProviders {
+		val, err := v.watchRemoteConfig(rp)
+		if err != nil {
+			v.logger.Error(fmt.Errorf("watch remote config: %w", err).Error())
+
+			continue
+		}
+		v.kvstore = val
+		return nil
+	}
+	return RemoteConfigError("No Files Found")
+}
+
+func (v *Viper) watchRemoteConfig(provider RemoteProvider) (map[string]any, error) {
+	reader, err := RemoteConfig.Watch(provider)
+	if err != nil {
+		return nil, err
+	}
+	err = v.unmarshalReader(reader, v.kvstore)
+	return v.kvstore, err
+}

remote/go.mod

@@ -0,0 +1,90 @@
+module github.com/spf13/viper/remote
+
+go 1.21
+
+replace github.com/spf13/viper => ../
+
+require (
+	github.com/sagikazarmark/crypt v0.22.0
+	github.com/spf13/viper v1.20.0-alpha.5
+)
+
+require (
+	cloud.google.com/go v0.115.0 // indirect
+	cloud.google.com/go/auth v0.6.0 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.2 // indirect
+	cloud.google.com/go/compute/metadata v0.3.0 // indirect
+	cloud.google.com/go/firestore v1.15.0 // indirect
+	cloud.google.com/go/longrunning v0.5.7 // indirect
+	github.com/armon/go-metrics v0.4.1 // indirect
+	github.com/coreos/go-semver v0.3.0 // indirect
+	github.com/coreos/go-systemd/v22 v22.3.2 // indirect
+	github.com/fatih/color v1.16.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-viper/mapstructure/v2 v2.0.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/s2a-go v0.1.7 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
+	github.com/googleapis/gax-go/v2 v2.12.5 // indirect
+	github.com/hashicorp/consul/api v1.29.1 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-hclog v1.5.0 // indirect
+	github.com/hashicorp/go-immutable-radix v1.3.1 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
+	github.com/hashicorp/golang-lru v0.5.4 // indirect
+	github.com/hashicorp/serf v0.10.1 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.17.2 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/nats-io/nats.go v1.36.0 // indirect
+	github.com/nats-io/nkeys v0.4.7 // indirect
+	github.com/nats-io/nuid v1.0.1 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/sagikazarmark/locafero v0.6.0 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.11.0 // indirect
+	github.com/spf13/cast v1.6.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	go.etcd.io/etcd/api/v3 v3.5.14 // indirect
+	go.etcd.io/etcd/client/pkg/v3 v3.5.14 // indirect
+	go.etcd.io/etcd/client/v2 v2.305.14 // indirect
+	go.etcd.io/etcd/client/v3 v3.5.14 // indirect
+	go.opencensus.io v0.24.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect
+	go.opentelemetry.io/otel v1.24.0 // indirect
+	go.opentelemetry.io/otel/metric v1.24.0 // indirect
+	go.opentelemetry.io/otel/trace v1.24.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
+	go.uber.org/zap v1.21.0 // indirect
+	golang.org/x/crypto v0.24.0 // indirect
+	golang.org/x/exp v0.0.0-20230817173708-d852ddb80c63 // indirect
+	golang.org/x/net v0.26.0 // indirect
+	golang.org/x/oauth2 v0.21.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.21.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
+	golang.org/x/time v0.5.0 // indirect
+	google.golang.org/api v0.186.0 // indirect
+	google.golang.org/genproto v0.0.0-20240617180043-68d350f18fd4 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20240610135401-a8a62080eff3 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240617180043-68d350f18fd4 // indirect
+	google.golang.org/grpc v1.64.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

remote/go.sum

@@ -0,0 +1,460 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.115.0 h1:CnFSK6Xo3lDYRoBKEcAtia6VSC837/ZkJuRduSFnr14=
+cloud.google.com/go v0.115.0/go.mod h1:8jIM5vVgoAEoiVxQ/O4BFTfHqulPZgs/ufEzMcFMdWU=
+cloud.google.com/go/auth v0.6.0 h1:5x+d6b5zdezZ7gmLWD1m/xNjnaQ2YDhmIz/HH3doy1g=
+cloud.google.com/go/auth v0.6.0/go.mod h1:b4acV+jLQDyjwm4OXHYjNvRi4jvGBzHWJRtJcy+2P4g=
+cloud.google.com/go/auth/oauth2adapt v0.2.2 h1:+TTV8aXpjeChS9M+aTtN/TjdQnzJvmzKFt//oWu7HX4=
+cloud.google.com/go/auth/oauth2adapt v0.2.2/go.mod h1:wcYjgpZI9+Yu7LyYBg4pqSiaRkfEK3GQcpb7C/uyF1Q=
+cloud.google.com/go/compute/metadata v0.3.0 h1:Tz+eQXMEqDIKRsmY3cHTL6FVaynIjX2QxYC4trgAKZc=
+cloud.google.com/go/compute/metadata v0.3.0/go.mod h1:zFmK7XCadkQkj6TtorcaGlCW1hT1fIilQDwofLpJ20k=
+cloud.google.com/go/firestore v1.15.0 h1:/k8ppuWOtNuDHt2tsRV42yI21uaGnKDEQnRFeBpbFF8=
+cloud.google.com/go/firestore v1.15.0/go.mod h1:GWOxFXcv8GZUtYpWHw/w6IuYNux/BtmeVTMmjrm4yhk=
+cloud.google.com/go/longrunning v0.5.7 h1:WLbHekDbjK1fVFD3ibpFFVoyizlLRl73I7YKuAKilhU=
+cloud.google.com/go/longrunning v0.5.7/go.mod h1:8GClkudohy1Fxm3owmBGid8W0pSgodEMwEAztp38Xng=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/DataDog/datadog-go v3.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
+github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
+github.com/armon/go-metrics v0.4.1 h1:hR91U9KYmb6bLBYLQjyM+3j+rcd/UhE+G78SFnF8gJA=
+github.com/armon/go-metrics v0.4.1/go.mod h1:E6amYzXo6aW1tqzoZGT755KkbgrJsSdpwZ+3JqfkOG4=
+github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
+github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
+github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
+github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible/go.mod h1:nmEj6Dob7S7YxXgwXpfOuvO54S+tGdZdw9fuRZt25Ag=
+github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp5jckzBHf4XRpQvBOLI+I=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
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+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
+google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
+google.golang.org/grpc v1.64.0 h1:KH3VH9y/MgNQg1dE7b3XfVK0GsPSIzJwdF617gUSbvY=
+google.golang.org/grpc v1.64.0/go.mod h1:oxjF8E3FBnjp+/gVFYdWacaLDx9na1aqy9oovLpxQYg=
+google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
+google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
+google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
+google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
+google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
+google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

remote/remote.go

@@ -10,10 +10,11 @@ import (
 	"bytes"
 	"io"
 	"os"
+	"strings"
+
+	crypt "github.com/sagikazarmark/crypt/config"
 
 	"github.com/spf13/viper"
-
-	crypt "github.com/xordataexchange/crypt/config"
 )
 
 type remoteConfigProvider struct{}
@@ -75,6 +76,7 @@ func getConfigManager(rp viper.RemoteProvider) (crypt.ConfigManager, error) {
 	var cm crypt.ConfigManager
 	var err error
 
+	endpoints := strings.Split(rp.Endpoint(), ";")
 	if rp.SecretKeyring() != "" {
 		var kr *os.File
 		kr, err = os.Open(rp.SecretKeyring())
@@ -82,16 +84,30 @@ func getConfigManager(rp viper.RemoteProvider) (crypt.ConfigManager, error) {
 			return nil, err
 		}
 		defer kr.Close()
-		if rp.Provider() == "etcd" {
-			cm, err = crypt.NewEtcdConfigManager([]string{rp.Endpoint()}, kr)
-		} else {
-			cm, err = crypt.NewConsulConfigManager([]string{rp.Endpoint()}, kr)
+		switch rp.Provider() {
+		case "etcd":
+			cm, err = crypt.NewEtcdConfigManager(endpoints, kr)
+		case "etcd3":
+			cm, err = crypt.NewEtcdV3ConfigManager(endpoints, kr)
+		case "firestore":
+			cm, err = crypt.NewFirestoreConfigManager(endpoints, kr)
+		case "nats":
+			cm, err = crypt.NewNatsConfigManager(endpoints, kr)
+		default:
+			cm, err = crypt.NewConsulConfigManager(endpoints, kr)
 		}
 	} else {
-		if rp.Provider() == "etcd" {
-			cm, err = crypt.NewStandardEtcdConfigManager([]string{rp.Endpoint()})
-		} else {
-			cm, err = crypt.NewStandardConsulConfigManager([]string{rp.Endpoint()})
+		switch rp.Provider() {
+		case "etcd":
+			cm, err = crypt.NewStandardEtcdConfigManager(endpoints)
+		case "etcd3":
+			cm, err = crypt.NewStandardEtcdV3ConfigManager(endpoints)
+		case "firestore":
+			cm, err = crypt.NewStandardFirestoreConfigManager(endpoints)
+		case "nats":
+			cm, err = crypt.NewStandardNatsConfigManager(endpoints)
+		default:
+			cm, err = crypt.NewStandardConsulConfigManager(endpoints)
 		}
 	}
 	if err != nil {

util.go

@@ -12,15 +12,14 @@ package viper
 
 import (
 	"fmt"
+	"log/slog"
 	"os"
 	"path/filepath"
 	"runtime"
 	"strings"
 	"unicode"
 
-	"github.com/spf13/afero"
 	"github.com/spf13/cast"
-	jww "github.com/spf13/jwalterweatherman"
 )
 
 // ConfigParseError denotes failing to parse configuration file.
@@ -33,13 +32,18 @@ func (pe ConfigParseError) Error() string {
 	return fmt.Sprintf("While parsing config: %s", pe.err.Error())
 }
 
+// Unwrap returns the wrapped error.
+func (pe ConfigParseError) Unwrap() error {
+	return pe.err
+}
+
 // toCaseInsensitiveValue checks if the value is a  map;
 // if so, create a copy and lower-case the keys recursively.
-func toCaseInsensitiveValue(value interface{}) interface{} {
+func toCaseInsensitiveValue(value any) any {
 	switch v := value.(type) {
-	case map[interface{}]interface{}:
+	case map[any]any:
 		value = copyAndInsensitiviseMap(cast.ToStringMap(v))
-	case map[string]interface{}:
+	case map[string]any:
 		value = copyAndInsensitiviseMap(v)
 	}
 
@@ -48,15 +52,15 @@ func toCaseInsensitiveValue(value interface{}) interface{} {
 
 // copyAndInsensitiviseMap behaves like insensitiviseMap, but creates a copy of
 // any map it makes case insensitive.
-func copyAndInsensitiviseMap(m map[string]interface{}) map[string]interface{} {
-	nm := make(map[string]interface{})
+func copyAndInsensitiviseMap(m map[string]any) map[string]any {
+	nm := make(map[string]any)
 
 	for key, val := range m {
 		lkey := strings.ToLower(key)
 		switch v := val.(type) {
-		case map[interface{}]interface{}:
+		case map[any]any:
 			nm[lkey] = copyAndInsensitiviseMap(cast.ToStringMap(v))
-		case map[string]interface{}:
+		case map[string]any:
 			nm[lkey] = copyAndInsensitiviseMap(v)
 		default:
 			nm[lkey] = v
@@ -66,18 +70,25 @@ func copyAndInsensitiviseMap(m map[string]interface{}) map[string]interface{} {
 	return nm
 }
 
-func insensitiviseMap(m map[string]interface{}) {
-	for key, val := range m {
-		switch val.(type) {
-		case map[interface{}]interface{}:
-			// nested map: cast and recursively insensitivise
-			val = cast.ToStringMap(val)
-			insensitiviseMap(val.(map[string]interface{}))
-		case map[string]interface{}:
-			// nested map: recursively insensitivise
-			insensitiviseMap(val.(map[string]interface{}))
-		}
+func insensitiviseVal(val any) any {
+	switch v := val.(type) {
+	case map[any]any:
+		// nested map: cast and recursively insensitivise
+		val = cast.ToStringMap(val)
+		insensitiviseMap(val.(map[string]any))
+	case map[string]any:
+		// nested map: recursively insensitivise
+		insensitiviseMap(v)
+	case []any:
+		// nested array: recursively insensitivise
+		insensitiveArray(v)
+	}
+	return val
+}
 
+func insensitiviseMap(m map[string]any) {
+	for key, val := range m {
+		val = insensitiviseVal(val)
 		lower := strings.ToLower(key)
 		if key != lower {
 			// remove old key (not lower-cased)
@@ -88,17 +99,20 @@ func insensitiviseMap(m map[string]interface{}) {
 	}
 }
 
-func absPathify(inPath string) string {
-	jww.INFO.Println("Trying to resolve absolute path to", inPath)
+func insensitiveArray(a []any) {
+	for i, val := range a {
+		a[i] = insensitiviseVal(val)
+	}
+}
 
-	if strings.HasPrefix(inPath, "$HOME") {
+func absPathify(logger *slog.Logger, inPath string) string {
+	logger.Info("trying to resolve absolute path", "path", inPath)
+
+	if inPath == "$HOME" || strings.HasPrefix(inPath, "$HOME"+string(os.PathSeparator)) {
 		inPath = userHomeDir() + inPath[5:]
 	}
 
-	if strings.HasPrefix(inPath, "$") {
-		end := strings.Index(inPath, string(os.PathSeparator))
-		inPath = os.Getenv(inPath[1:end]) + inPath[end:]
-	}
+	inPath = os.ExpandEnv(inPath)
 
 	if filepath.IsAbs(inPath) {
 		return filepath.Clean(inPath)
@@ -109,21 +123,9 @@ func absPathify(inPath string) string {
 		return filepath.Clean(p)
 	}
 
-	jww.ERROR.Println("Couldn't discover absolute path")
-	jww.ERROR.Println(err)
-	return ""
-}
+	logger.Error(fmt.Errorf("could not discover absolute path: %w", err).Error())
 
-// Check if file Exists
-func exists(fs afero.Fs, path string) (bool, error) {
-	stat, err := fs.Stat(path)
-	if err == nil {
-		return !stat.IsDir(), nil
-	}
-	if os.IsNotExist(err) {
-		return false, nil
-	}
-	return false, err
+	return ""
 }
 
 func stringInSlice(a string, list []string) bool {
@@ -154,7 +156,7 @@ func safeMul(a, b uint) uint {
 	return c
 }
 
-// parseSizeInBytes converts strings like 1GB or 12 mb into an unsigned integer number of bytes
+// parseSizeInBytes converts strings like 1GB or 12 mb into an unsigned integer number of bytes.
 func parseSizeInBytes(sizeStr string) uint {
 	sizeStr = strings.TrimSpace(sizeStr)
 	lastChar := len(sizeStr) - 1
@@ -196,22 +198,22 @@ func parseSizeInBytes(sizeStr string) uint {
 // In case intermediate keys do not exist, or map to a non-map value,
 // a new map is created and inserted, and the search continues from there:
 // the initial map "m" may be modified!
-func deepSearch(m map[string]interface{}, path []string) map[string]interface{} {
+func deepSearch(m map[string]any, path []string) map[string]any {
 	for _, k := range path {
 		m2, ok := m[k]
 		if !ok {
 			// intermediate key does not exist
 			// => create it and continue from there
-			m3 := make(map[string]interface{})
+			m3 := make(map[string]any)
 			m[k] = m3
 			m = m3
 			continue
 		}
-		m3, ok := m2.(map[string]interface{})
+		m3, ok := m2.(map[string]any)
 		if !ok {
 			// intermediate key is a value
 			// => replace with a new map
-			m3 = make(map[string]interface{})
+			m3 = make(map[string]any)
 			m[k] = m3
 		}
 		// continue search from here

util_test.go

@@ -11,44 +11,76 @@
 package viper
 
 import (
-	"reflect"
+	"log/slog"
+	"os"
+	"path/filepath"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestCopyAndInsensitiviseMap(t *testing.T) {
 	var (
-		given = map[string]interface{}{
+		given = map[string]any{
 			"Foo": 32,
-			"Bar": map[interface{}]interface {
-			}{
+			"Bar": map[any]any{
 				"ABc": "A",
-				"cDE": "B"},
+				"cDE": "B",
+			},
 		}
-		expected = map[string]interface{}{
+		expected = map[string]any{
 			"foo": 32,
-			"bar": map[string]interface {
-			}{
+			"bar": map[string]any{
 				"abc": "A",
-				"cde": "B"},
+				"cde": "B",
+			},
 		}
 	)
 
 	got := copyAndInsensitiviseMap(given)
 
-	if !reflect.DeepEqual(got, expected) {
-		t.Fatalf("Got %q\nexpected\n%q", got, expected)
+	assert.Equal(t, expected, got)
+	_, ok := given["foo"]
+	assert.False(t, ok)
+	_, ok = given["bar"]
+	assert.False(t, ok)
+
+	m := given["Bar"].(map[any]any)
+	_, ok = m["ABc"]
+	assert.True(t, ok)
+}
+
+func TestAbsPathify(t *testing.T) {
+	skipWindows(t)
+
+	home := userHomeDir()
+	homer := filepath.Join(home, "homer")
+	wd, _ := os.Getwd()
+
+	t.Setenv("HOMER_ABSOLUTE_PATH", homer)
+	t.Setenv("VAR_WITH_RELATIVE_PATH", "relative")
+
+	tests := []struct {
+		input  string
+		output string
+	}{
+		{"", wd},
+		{"sub", filepath.Join(wd, "sub")},
+		{"./", wd},
+		{"./sub", filepath.Join(wd, "sub")},
+		{"$HOME", home},
+		{"$HOME/", home},
+		{"$HOME/sub", filepath.Join(home, "sub")},
+		{"$HOMER_ABSOLUTE_PATH", homer},
+		{"$HOMER_ABSOLUTE_PATH/", homer},
+		{"$HOMER_ABSOLUTE_PATH/sub", filepath.Join(homer, "sub")},
+		{"$VAR_WITH_RELATIVE_PATH", filepath.Join(wd, "relative")},
+		{"$VAR_WITH_RELATIVE_PATH/", filepath.Join(wd, "relative")},
+		{"$VAR_WITH_RELATIVE_PATH/sub", filepath.Join(wd, "relative", "sub")},
 	}
 
-	if _, ok := given["foo"]; ok {
-		t.Fatal("Input map changed")
-	}
-
-	if _, ok := given["bar"]; ok {
-		t.Fatal("Input map changed")
-	}
-
-	m := given["Bar"].(map[interface{}]interface{})
-	if _, ok := m["ABc"]; !ok {
-		t.Fatal("Input map changed")
+	for _, test := range tests {
+		got := absPathify(slog.Default(), test.input)
+		assert.Equal(t, test.output, got)
 	}
 }

viper_yaml_test.go

@@ -0,0 +1,53 @@
+package viper
+
+var yamlExample = []byte(`Hacker: true
+name: steve
+hobbies:
+    - skateboarding
+    - snowboarding
+    - go
+clothing:
+    jacket: leather
+    trousers: denim
+    pants:
+        size: large
+age: 35
+eyes : brown
+beard: true
+`)
+
+var yamlWriteExpected = []byte(`age: 35
+beard: true
+clothing:
+    jacket: leather
+    pants:
+        size: large
+    trousers: denim
+eyes: brown
+hacker: true
+hobbies:
+    - skateboarding
+    - snowboarding
+    - go
+name: steve
+`)
+
+var yamlExampleWithDot = []byte(`Hacker: true
+name: steve
+hobbies:
+    - skateboarding
+    - snowboarding
+    - go
+clothing:
+    jacket: leather
+    trousers: denim
+    pants:
+        size: large
+age: 35
+eyes : brown
+beard: true
+emails:
+    steve@hacker.com:
+        created: 01/02/03
+        active: true
+`)