commit-msg

#!/usr/bin/env bash
unset GREP_OPTIONS
COMMIT_MSG_ERROR_FOUND=0
MSG="$1"
ERROR_TEXT="\n"

#
# Check for maximum line length
#
checkForLineLength() {
    if egrep -q '^[^#].{74}' "$MSG"; then
        COMMIT_MSG_ERROR_FOUND=1
        ERROR_TEXT="${ERROR_TEXT} - The maximum line length of 74 characters is exceeded.\n"
    fi
}

#
# Check for existence of the commit type text
#
checkForCommitType() {
    if ! egrep -q '\[[^]]+\] .+$' "$MSG"; then
        COMMIT_MSG_ERROR_FOUND=1
        ERROR_TEXT="${ERROR_TEXT} - Your first line has to contain a commit type like '[BUGFIX]'.\n"
    fi
}

checkForLineLength
checkForCommitType

# Abort commit on message format errors
if [ $COMMIT_MSG_ERROR_FOUND -eq 1 ]; then
    echo -e " "
    echo -e "------------------------------------------------------------------"
    echo -e " >> ERROR in your commit message:                                 "
    echo -e "  $ERROR_TEXT"
    echo -e "                                                                  "
    echo -e "  You should fix this and then do commit --amend etc.             "
    echo -e "------------------------------------------------------------------\n"
fi