Loosely enforces a [PROJECT]-[TICKET] naming structure for Git commits based on Git branch name.

prepare-commit-msg.bash

#!/bin/bash

# SOURCE: https://git-scm.com/docs/githooks
# SOURCE: https://gist.github.com/bartoszmajsak/1396344

#==================================================================================================#
# Loosely enforces a [PROJECT]-[TICKET] naming structure for Git commits based on Git branch name. #
#==================================================================================================#

BRANCH_NAME=$(git rev-parse --abbrev-ref HEAD 2> /dev/null)

if [ "$BRANCH_NAME" == "master" ] || [ "$BRANCH_NAME" == "develop" ] || [ "$BRANCH_NAME" == "test" ] || [[ "$BRANCH_NAME" = release* ]]; then
  # exit normally and don't modify the commit
  exit 0
else
  # otherwise, extract [PROJECT]-[TICKET] from the branch name
  PROJECT_AND_TICKET=$(echo $BRANCH_NAME | grep -oE "[A-Z0-9]+-[0-9]+")

  if [ -n "$PROJECT_AND_TICKET" ]; then
    # prepend the commit message with "[PROJECT]-[TICKET]"
    sed -i.bak -e "1s/^/$PROJECT_AND_TICKET: /" $1
  else
    echo "error: your branch name must contain \"[PROJECT]-[TICKET]\""
    exit 1
  fi
fi