.git/hooks/prepare-commit-msg

prepare-commit-msg

#!/bin/bash

# usage:
# mkdir ~/.githooks
# nvim ~/.githooks/prepare-commit-msg # paste the content of this file
# git config --global core.hooksPath ~/.githooks/ # you don't have to do it globally but

COMMIT_MSG_FILE=$1
branch="$(git rev-parse --abbrev-ref HEAD)"

if [[ "$branch" =~ ^([0-9]+) ]]; then
  prefix="[${BASH_REMATCH[1]}]"

  echo -e "$prefix\n$(cat $COMMIT_MSG_FILE)" > $COMMIT_MSG_FILE
fi

if [[ "$branch" =~ ^([a-zA-Z]+)-([0-9]+) ]]; then
  raw_prefix="${BASH_REMATCH[1]}"
  id="${BASH_REMATCH[2]}"

  # Convert the prefix to uppercase
  prefix=$(echo "$raw_prefix" | tr '[:lower:]' '[:upper:]')

  # Format the prefix and prepend it to the commit message
  echo -e "[${prefix}-${id}]\n$(cat "$COMMIT_MSG_FILE")" > "$COMMIT_MSG_FILE"
fi