git hook to edit commit message

commit-msg

#!/bin/bash
# git hook to add ticket number from branch name
# branch names should have the following naming
# convention for this to work:
#   <type>/<ticket-handle-without-hashes>-<ticket-title>

BRANCH_NAME="$(git rev-parse --abbrev-ref HEAD)"

COMMIT_MSG=$(cat "$1")
TICKET_NO_FROM_BRANCH_NAME=$(echo $BRANCH_NAME | cut -d "/" -f 2 | cut -d "-" -f 1)
grep -qs "^$TICKET_NO_FROM_BRANCH_NAME" "$1" || echo "[$TICKET_NO_FROM_BRANCH_NAME] $(cat "$1")" > "$1"