prepare-commit-msg hook for populating commit message template with the JIRA ticket number as a prefix

prepare-commit-msg

#!/bin/sh

COMMIT_MSG_FILE=$1
COMMIT_SOURCE=$2
SHA1=$3

#/usr/bin/perl -i.bak -ne 'print unless(m/^. Please enter the commit message/..m/^#$/)' "$COMMIT_MSG_FILE"

# Include any branches for which you wish to disable this script
if [ -z "$BRANCHES_TO_SKIP" ]; then
  BRANCHES_TO_SKIP=(master develop)
fi
# Get the current branch name
BRANCH_NAME=$(git symbolic-ref --short HEAD)

# Ticket name is retrieved as a string between the first slash and the second hyphen
TICKET_NAME=$(echo $BRANCH_NAME | sed -e 's/.*\([A-Z]\{3\}-[0-9]\{3\}\).*/\1/')

BRANCH_EXCLUDED=$(printf "%s\n" "${BRANCHES_TO_SKIP[@]}" | grep -c "^$BRANCH_NAME$")

ALREADY_IN_MSG=$(grep -c "\[$TICKET_NAME\]" $COMMIT_MSG_FILE)

# If it isn't excluded or already in commit message, prepend the ticket name to the given message
if ! [ "$TICKET_NAME" == "$BRANCH_NAME" ] && [ -n "$BRANCH_NAME" ] && ! [[ "$BRANCH_EXCLUDED" -eq 1 ]] && ! [[ "$ALREADY_IN_MSG" -eq 1 ]]; then
    sed -i.bak -e "1s/^/[$TICKET_NAME] /" "$COMMIT_MSG_FILE"
fi