git-hook-workingcopychange

#!/usr/bin/env bash
#
# Ref:https://gist.github.com/jubianchi
# Symlink this file at: `.git/hooks/post-checkout` and make it executable.
# You can install it system wide too, see http://stackoverflow.com/a/2293578/685587

#---------------------------------------------------------------------
usage ()
{
	cat <<EOT

${0##*/}
    A git hook script intended to be used when your working copy
    changes (checkout or merge). Checks for a composer.lock file.
    If present, checks if the checkout includes changes to the
    lock file. If changes are detected, executes
    \`composer install\` to update dependencies to match the new
    working copy.

    Symlink this file as \`.git/hooks/post-checkout\` in your
    project to have it auto-execute at the appropriate times. By
    default, the script will only prompt you when the associated
    commands should be executed.

Usage:
    bin/${0##*/}

Environment Variables:
    GIT_HOOK_POSTCHECKOUT_FORCE_EXECUTE
        When set to a non-empty string, will cause the script to
        auto-execute the associated commands instead of just
        prompting about them.


EOT

	exit ${1:-0}  # Exit with code 0 unless an arg is passed to the method.
}
if [ "$1" = '-h' ]; then
	usage
fi


# Bail out early if we're in the middle of a merge or rebase.
GIT_DIR=$(git rev-parse --git-dir)
GIT_DIR_MERGE="$GIT_DIR"/rebase-merge
GIT_DIR_APPLY="$GIT_DIR"/rebase-apply
if [[ (-d "$GIT_DIR_MERGE" && -f "$GIT_DIR_MERGE/interactive") || -d "$GIT_DIR_APPLY" ]]; then
	exit 0
fi


# Add pairs of files to check for differences, and the commands to run
# if diffs are found. MUST be in the same order! (first file must
# pair with the first command!)
FILE_LIST=("composer.lock")
CMD_LIST=("composer install --dev --no-interaction --ignore-platform-reqs")


# Loop over the configured files.
for ((i=0; i < ${#FILE_LIST[@]}; ++i)); do
	CHECK_FILE="${FILE_LIST[i]}"
	CHECK_CMD="${CMD_LIST[i]}"
	DIFF=$(git diff --stat HEAD@{1}..HEAD@{0} -- "$CHECK_FILE")
	if [[ -f "$CHECK_FILE" && -n "$DIFF" ]]; then
		if [ "${GIT_HOOK_POSTCHECKOUT_FORCE_EXECUTE:-""}" ]; then
			echo "\`$CHECK_FILE\` has changed. Executing hook command."
			$CHECK_CMD
		else
			echo "\`$CHECK_FILE\` has changed. You should execute the following command:"
			echo ""
			echo "    $CHECK_CMD"
			echo ""
		fi
	fi
done