commit-msg

#!/bin/sh
set -e
#
# A hook script to check the commit log message.
# Called by "git commit" with one argument, the name of the file
# that has the commit message.  The hook should exit with non-zero
# status after issuing an appropriate message if it wants to stop the
# commit.  The hook is allowed to edit the commit message file.

used_emojis=$(git log --pretty=format:"%s" | awk 'NF>1{print $NF}')
commit_emoji=$(cat $1 | awk 'NF>1{print $NF}')

if [ -z "$(sed 's/[a-zA-Z0-9+\-_., ;:]//g' "$1")" ]; then
	echo -e >&2 "\e[1;33mWarning: It looks like no emoji was used\e[0m"
fi
if [ "${used_emojis#*"$commit_emoji"}" != "$used_emojis" ]; then
	echo -e >&2 "\e[1;31mError: The emoji in the commit message has already been used! Unable to commit.\e[0m"
	exit 1
fi