Git hook to extract ticket id by regex, to prefix the message with the ticket id when staging with a message.

prepare-commit-msg.bash

#!/bin/sh

# Default regex for clubhouse.io tickets
DEFAULT_TICKET_REGEX="ch\d\+"
: ${TICKET_ID_REGEX:=$DEFAULT_TICKET_REGEX}

# Example 
# Branch: ch1623/global-sitemap-urls-are-relative
# Message: Fixed that shit
# Result commit message: "ch1623: Fixed that shit"

prefixExtractedTicketIdToMessage() {
  branch_name=$(git branch | grep '*' | sed 's/* //')
  ticket_id=$(echo $branch_name | grep -io "$TICKET_ID_REGEX" )

  if [ $ticket_id ]; then
    echo "$ticket_id: $2" > $1
  fi
}

case "$2,$3" in
  # Matches Typical git comm
  message,)
    prefixExtractedTicketIdToMessage $1 $2
  ;;

  # Merge commits
  merge,)
  ;;

  # Non-merges with no prior messages
  *)
  ;;
esac