enforce commit message to start with issue number

commit-msg

#!/bin/bash
#
# This file should be in .git/hooks/commit-msg
# It uses the current branch name to prefix the commit message.

name=$(git rev-parse --abbrev-ref HEAD | sed 's/\(issue-[0-9]*\).*/\1/')
if [ $name != 'HEAD' ]; then
    cat $1 | sed "s/^$name: //" | egrep -v "^#" > $1.tmp
    echo -n "$name"': ' > $1
    cat $1.tmp >> $1
    rm $1.tmp
fi

Copy this file in your .git/hooks/ it will prepend the branch name to your commit messages.
If your branch is named issue-451-something-else it will only prepend issue-451.

It works nicely with amending commit. During rebasing it doesn't prepend anything as during rebasing it is not possible to determine which is the current branch.

Very nice, thanks!

you're welcome! I've updated it again since there was a bug with multiline comments.