Golang git pre commit hook

pre-commit

#!/bin/sh
#

# Note this is mostly the standard git pre-commit.sample which can be found
# in your repo's .git/hooks/ directory with golang fmt added at the bottom.

# An example hook script to verify what is about to be committed.
# Called by "git commit" with no arguments.  The hook should
# exit with non-zero status after issuing an appropriate message if
# it wants to stop the commit.
#
# This file must be called "pre-commit" in dir <project>/.git/hooks/
# and have execution permissions

if git rev-parse --verify HEAD >/dev/null 2>&1
then
       	against=HEAD
else
       	# Initial commit: diff against an empty tree object
       	against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

# If you want to allow non-ASCII filenames set this variable to true.
allownonascii=$(git config --bool hooks.allownonascii)

# Redirect output to stderr.
exec 1>&2

# Cross platform projects tend to avoid non-ASCII filenames; prevent
# them from being added to the repository. We exploit the fact that the
# printable range starts at the space character and ends with tilde.
if [ "$allownonascii" != "true" ] &&
       	# Note that the use of brackets around a tr range is ok here, (it's
       	# even required, for portability to Solaris 10's /usr/bin/tr), since
       	# the square bracket bytes happen to fall in the designated range.
       	test $(git diff --cached --name-only --diff-filter=A -z $against |
       	  LC_ALL=C tr -d '[ -~]\0' | wc -c) != 0
then
       	cat <<\EOF
Error: Attempt to add a non-ASCII file name.

This can cause problems if you want to work with people on other platforms.

To be portable it is advisable to rename the file.

If you know what you are doing you can disable this check using:

  git config hooks.allownonascii true
EOF
       	exit 1
fi

# git gofmt pre-commit hook
# This script does not handle file names that contain spaces.

gofiles=$(git diff --cached --name-only --diff-filter=ACM | grep '.go$')
[ -z "$gofiles" ] && exit 0

unformatted=$(gofmt -l $gofiles)
[ -z "$unformatted" ] && exit 0

# Some files are not gofmt'd. Print message and fail.

echo >&2 "Go files must be formatted with gofmt. Please run:"
for fn in $unformatted; do
    echo >&2 "  gofmt -w $PWD/$fn"
done

exit 1