update pre-commit hook with other static checks

misc/git/pre-commit

@@ -1,37 +1,52 @@
 #!/bin/sh
-# Copyright 2012 The Go Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
 
-# git gofmt pre-commit hook
-#
-# To use, store as .git/hooks/pre-commit inside your repository and make sure
-# it has execute permissions.
-#
-# This script does not handle file names that contain spaces.
+echo ">>> golint"
+for dir in $(go list ./... | grep -v /vendor/)
+do
+    golint "${dir}"
+done
+echo "<<< golint"
+echo
 
-# golint is purely informational, it doesn't fail with exit code != 0 if it finds something,
-# because it may find a lot of false positives. Just print out its result for information.
-echo "lint result (informational only):"
-golint .
+echo ">>> go vet"
+go vet $(go list ./... | grep -v /vendor/)
+echo "<<< go vet"
+echo
 
-# go vet returns 1 if an error was found. Exit the hook with this exit code.
-go vet ./...
-vetres=$?
+echo ">>> gosimple"
+gosimple $(go list ./... | grep -v /vendor/)
+echo "<<< gosimple"
+echo
+
+echo ">>> staticcheck"
+staticcheck $(go list ./... | grep -v /vendor/)
+echo "<<< staticcheck"
+echo
+
+echo ">>> unused"
+unused $(go list ./... | grep -v /vendor/)
+echo "<<< unused"
+echo
+
+echo ">>> gas"
+gas $(find . -name "*.go" | grep -v /vendor/ | grep -v '_test.go$')
+echo "<<< gas"
+echo
 
 # Check for gofmt problems and report if any.
-gofiles=$(git diff --cached --name-only --diff-filter=ACM | grep '.go$')
+gofiles=$(git diff --cached --name-only --diff-filter=ACM | grep '.go$' | grep -v /vendor/)
 [ -z "$gofiles" ] && echo "EXIT $vetres" && exit $vetres
 
-unformatted=$(gofmt -l $gofiles)
-[ -z "$unformatted" ] && echo "EXIT $vetres" && exit $vetres
+if [ -n "$gofiles" ]; then
+    unformatted=$(gofmt -l $gofiles)
 
-# Some files are not gofmt'd. Print message and fail.
+    if [ -n "$unformatted" ]; then
+        # Some files are not gofmt'd.
+        echo >&2 "Go files must be formatted with gofmt. Please run:"
+        for fn in $unformatted; do
+            echo >&2 "  gofmt -w $PWD/$fn"
+        done
+    fi
+fi
+echo
 
-echo >&2 "Go files must be formatted with gofmt. Please run:"
-for fn in $unformatted; do
-    echo >&2 "  gofmt -w $PWD/$fn"
-done
-
-echo "EXIT 1"
-exit 1