Prepend issue number to commit message.

commit-msg.sh

#!/bin/bash
#
# Author:   Ye Liu
# URL:      https://gist.github.com/jaux/0380afaaada554488054
# License:  MIT

TICKET_FILE="$(pwd)/.last-ticket"

line=$(head -n 1 "$1")

# test if message has [TICKET#] already
echo $line | grep -q '^\s*\[.\+\].*'
if [ $? -eq 0 ]; then
    exit 0
fi

# get last ticket number
last_ticket=
if [ -f "$TICKET_FILE" ]; then
    last_ticket=$(head -n 1 "$TICKET_FILE")
    echo "$last_ticket" | grep -q '\d\+'
    if [ $? -ne 0 ]; then
        last_ticket=
    fi
fi

exec < /dev/tty

# prompt to enter ticket number
echo -n 'Ticket number (q to skip)'
if [ -z "$last_ticket" ]; then
    echo -n ': '
else
    echo -n " [$last_ticket]: "
fi
read ticket

if [ -z "$ticket" ]; then
    ticket="$last_ticket"
elif [ ${#ticket} -eq 1 -a $(echo "$ticket" | tr '[:upper:]' '[:lower:]') == 'q' ]; then
    exit 0
fi
echo "$ticket" > "$TICKET_FILE"

# confirm commit message
msg="[$ticket] $line"
echo "$msg"
while true; do
    read -p 'Look good? [Y/n/e] ' confirm
    if [ -z "$confirm" ]; then
        confirm='Y'
    else
        confirm=$(echo "${confirm:0:1}" | tr '[:lower:]' '[:upper:]')
    fi
    case "$confirm" in
        Y)
            # write commit message file
            echo "$msg" > "$1"
            exit 0
            ;;
        E)
            editor="$EDITOR"
            if [ -z "$editor" ]; then
                editor=$(which vim)
                if [ -z "$editor" ]; then
                    editor=$(which vi)
                    if [ -z "$editor" ]; then
                        echo 'No editor, abort commit'
                        exit 1
                    fi
                fi
            fi
            # write commit message file
            echo "$msg" > "$1"
            # edit commit message file
            $editor $1
            if [ $? -ne 0 ]; then
                echo 'abort commit'
                exit 1
            fi
            exit 0
            ;;
        N)
            # abort commit
            echo 'abort commit'
            exit 1
            ;;
        *)
            ;;
    esac
done