Automatically append a ticket number reference to git commit messages

commit-msg

#!/bin/bash

NUMLINES=$(cat "$1" |
    sed '{
        # Ignore the "References #blah" line
        /^References \#[0-9]*/d
        # Remove blank lines
        /^$/d
        # Remove lines containing only whitespace
        /^[ \t]*$/d
        # Remove comments that will be ignored by git
        /^\#.*/d
    }' |
    wc -l)

if [ $NUMLINES -eq "0" ]; then
    echo >&2 Aborting commit due to empty commit message.
    exit 1
fi

prepare-commit-msg

#!/bin/bash

# Don't do anything if we're editing a commit as a result of a merge,
# rebase, amend, etc
[[ $2 != "" ]] && [[ $3 != "" ]] && exit 0

TICKET_NUM=$(git branch | grep '^\*' | awk -F '[/-]' '{print $2}')

# The ticket number must be all digits
echo $TICKET_NUM | grep "^[[:digit:]]\+$" > /dev/null
[[ "$?" == "1" ]] && exit 0

grep "References #[[:digit]]\+"
if [ "$?" == "1" ]; then
  echo >> "$1"
  echo "References #$TICKET_NUM" >> "$1"
fi