#!/bin/bash

BRANCH_NAME=$(git symbolic-ref --short HEAD)
BRANCH_ADDED=$(grep -c "\[$BRANCH_NAME\]" $1)

## if branch was not manually added and BRANCH_NAME is not empty + starts with "ch"
if ! [[ $BRANCH_ADDED -ge 1 ]] && [ -n $BRANCH_NAME ] && [[ $BRANCH_NAME =~ ^ch.* ]]; then
  # remove everything after - or / (ch122/my-branch => ch122)
  BRANCH_NAME="${BRANCH_NAME%%[-/]*}"

  sed -i.bak -e "1s/^/[$BRANCH_NAME] /" $1
fi