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# Update Log
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**This document details any major updates required to use new features or improvements in Viper.**
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## v1.20.x
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### New file searching API
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Viper now includes a new file searching API that allows users to customize how Viper looks for config files.
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Viper accepts a custom [`Finder`](https://pkg.go.dev/github.com/spf13/viper#Finder) interface implementation:
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```go
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// Finder looks for files and directories in an [afero.Fs] filesystem.
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type Finder interface {
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Find(fsys afero.Fs) ([]string, error)
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}
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```
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It is supposed to return a list of paths to config files.
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The default implementation uses [github.com/sagikazarmark/locafero](https://github.com/sagikazarmark/locafero) under the hood.
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You can supply your own implementation using `WithFinder`:
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```go
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v := viper.NewWithOptions(
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viper.WithFinder(&MyFinder{}),
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)
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```
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For more information, check out the [Finder examples](https://pkg.go.dev/github.com/spf13/viper#Finder)
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and the [documentation](https://pkg.go.dev/github.com/sagikazarmark/locafero) for the locafero package.
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### New encoding API
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Viper now allows customizing the encoding layer by providing an API for encoding and decoding configuration data:
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```go
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// Encoder encodes Viper's internal data structures into a byte representation.
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// It's primarily used for encoding a map[string]any into a file format.
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type Encoder interface {
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Encode(v map[string]any) ([]byte, error)
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}
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// Decoder decodes the contents of a byte slice into Viper's internal data structures.
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// It's primarily used for decoding contents of a file into a map[string]any.
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type Decoder interface {
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Decode(b []byte, v map[string]any) error
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}
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// Codec combines [Encoder] and [Decoder] interfaces.
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type Codec interface {
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Encoder
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Decoder
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}
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```
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By default, Viper includes the following codecs:
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- JSON
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- TOML
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- YAML
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- Dotenv
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The rest of the codecs are moved to [github.com/go-viper/encoding](https://github.com/go-viper/encoding)
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Customizing the encoding layer is possible by providing a custom registry of codecs:
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- [Encoder](https://pkg.go.dev/github.com/spf13/viper#Encoder) -> [EncoderRegistry](https://pkg.go.dev/github.com/spf13/viper#EncoderRegistry)
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- [Decoder](https://pkg.go.dev/github.com/spf13/viper#Decoder) -> [DecoderRegistry](https://pkg.go.dev/github.com/spf13/viper#DecoderRegistry)
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- [Codec](https://pkg.go.dev/github.com/spf13/viper#Codec) -> [CodecRegistry](https://pkg.go.dev/github.com/spf13/viper#CodecRegistry)
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You can supply the registry of codecs to Viper using the appropriate `With*Registry` function:
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```go
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codecRegistry := viper.NewCodecRegistry()
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codecRegistry.RegisterCodec("myformat", &MyCodec{})
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v := viper.NewWithOptions(
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viper.WithCodecRegistry(codecRegistry),
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)
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```
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### BREAKING: HCL, Java properties, INI removed from core
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In order to reduce third-party dependencies, Viper dropped support for the following formats from the core:
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- HCL
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- Java properties
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- INI
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You can still use these formats though by importing them from [github.com/go-viper/encoding](https://github.com/go-viper/encoding):
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```go
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import (
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"github.com/go-viper/encoding/hcl"
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"github.com/go-viper/encoding/javaproperties"
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"github.com/go-viper/encoding/ini"
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)
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codecRegistry := viper.NewCodecRegistry()
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{
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codec := hcl.Codec{}
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codecRegistry.RegisterCodec("hcl", codec)
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codecRegistry.RegisterCodec("tfvars", codec)
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}
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{
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codec := &javaproperties.Codec{}
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codecRegistry.RegisterCodec("properties", codec)
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codecRegistry.RegisterCodec("props", codec)
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codecRegistry.RegisterCodec("prop", codec)
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}
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codecRegistry.RegisterCodec("ini", ini.Codec{})
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v := viper.NewWithOptions(
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viper.WithCodecRegistry(codecRegistry),
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)
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```
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+3
-3
@@ -6,7 +6,7 @@ replace github.com/spf13/viper => ../
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require (
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github.com/sagikazarmark/crypt v0.26.0
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github.com/spf13/viper v1.20.0-alpha.6
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github.com/spf13/viper v1.20.0
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)
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require (
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@@ -56,8 +56,8 @@ require (
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github.com/sagikazarmark/locafero v0.7.0 // indirect
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github.com/sourcegraph/conc v0.3.0 // indirect
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github.com/spf13/afero v1.12.0 // indirect
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github.com/spf13/cast v1.7.0 // indirect
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github.com/spf13/pflag v1.0.5 // indirect
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github.com/spf13/cast v1.7.1 // indirect
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github.com/spf13/pflag v1.0.6 // indirect
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github.com/subosito/gotenv v1.6.0 // indirect
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go.etcd.io/etcd/api/v3 v3.5.15 // indirect
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go.etcd.io/etcd/client/pkg/v3 v3.5.15 // indirect
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+4
-4
@@ -256,10 +256,10 @@ github.com/sourcegraph/conc v0.3.0 h1:OQTbbt6P72L20UqAkXXuLOj79LfEanQ+YQFNpLA9yS
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github.com/sourcegraph/conc v0.3.0/go.mod h1:Sdozi7LEKbFPqYX2/J+iBAM6HpqSLTASQIKqDmF7Mt0=
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github.com/spf13/afero v1.12.0 h1:UcOPyRBYczmFn6yvphxkn9ZEOY65cpwGKb5mL36mrqs=
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github.com/spf13/afero v1.12.0/go.mod h1:ZTlWwG4/ahT8W7T0WQ5uYmjI9duaLQGy3Q2OAl4sk/4=
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github.com/spf13/cast v1.7.0 h1:ntdiHjuueXFgm5nzDRdOS4yfT43P5Fnud6DH50rz/7w=
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github.com/spf13/cast v1.7.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
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github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
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github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
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github.com/spf13/cast v1.7.1 h1:cuNEagBQEHWN1FnbGEjCXL2szYEXqfJPbP2HNUaca9Y=
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github.com/spf13/cast v1.7.1/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
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github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
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github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
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github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
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