Prepend the ticket number from current branch to commit message

prepare-commit-msg

#!/bin/sh

# Put this in .git/hooks/

# Get current branch
branchName=`git rev-parse --abbrev-ref HEAD`
echo "branchName: $branchName" >&2

# Match Jira issue ID in a pattern such as "{any_word}/abc-123-description" or "ABC-123-description"
jiraId=$(echo $branchName | sed -Ene 's,^([a-zA-Z0-9_/-]+/)?([a-zA-Z]+-[0-9]+)-.+,\2,p')
echo "jiraId: $jiraId" >&2

# Only prepare commit message if pattern matched and JiraId was found
if [[ ! -z $jiraId ]]; then
    # $1 is the name of the file containing the commit message
    echo "Adding Jira issue ID to commit message..." >&2
    sed -i.bak -e "1s/^/[$jiraId] /" $1
else
    echo "No Jira issue ID found in branch name." >&2
fi