Replace lefthook with shell script

git/pre-commit

@@ -0,0 +1,32 @@
+#!/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.
+
+if which goimports > /dev/null; then
+  gofmtcmd=goimports
+else
+  gofmtcmd=gofmt
+fi
+
+gofiles=$(git diff --cached --name-only --diff-filter=ACM | grep '.go$')
+[ -z "$gofiles" ] && exit 0
+
+unformatted=$($gofmtcmd -l $gofiles)
+[ -z "$unformatted" ] && exit 0
+
+# Some files are not gofmt'd. Print message and fail.
+
+echo >&2 "Go files must be formatted with '$gofmtcmd'. Please run:"
+for fn in $unformatted; do
+	echo >&2 "  $gofmtcmd -w $PWD/$fn"
+done
+
+exit 1