#!/bin/bash
#source: https://medium.com/better-programming/how-to-automatically-add-the-ticket-number-in-git-commit-message-bda5426ded05

FILE=$1
MESSAGE=$(cat $FILE)
BRANCH_NAME=$(git rev-parse --abbrev-ref HEAD)
TITLE_TAG="<Title>"

BRANCH_REGEXP="^(\w+/)?(\w+[-_])?([0-9]+)[-_](.*)$"
if [[ ${BRANCH_NAME} =~ ${BRANCH_REGEXP} ]]; then
    TICKET="[${BASH_REMATCH[2]}${BASH_REMATCH[3]}]"
    MESSAGE_TEXT="${BASH_REMATCH[4]//[-_]/ }"

    if [[ ${MESSAGE} == "${TICKET}"* ]]; then
        exit 0
    fi

    NEW_TITLE="${TICKET} ${MESSAGE_TEXT}"

    echo "FILE:$FILE"
    echo "TITLE_TAG:$TITLE_TAG"
    FROM_TEMPLATE=$(cat ${FILE} | grep "${TITLE_TAG}")
    echo "FROM_TEMPLATE: '${FROM_TEMPLATE}'"
    if [[ -n $( cat $FILE | grep "${TITLE_TAG}" ) ]]; then
        sed  -i "s:${TITLE_TAG}:${NEW_TITLE}:" $FILE
    else 
        echo -e "$TICKET $MESSAGE_TEXT \n$MESSAGE" > $FILE
    fi
else
    echo "$MESSAGE" > $FILE
fi