commit-msg.sh

#! /bin/bash
# Script to verify that commit message matches conventions

# set directory for calling other scripts
DIR=$(dirname "${BASH_SOURCE[0]}")
# if in hook, then prep PATH to find in repo `scripts/hooks/` dir 
# shellcheck disable=SC2076
if [[ $DIR =~ ".git" ]]; then
  DIR+="/../../scripts/hooks"
fi


MSG_PREFIXES=( 'wip' )
OTHER_PREFIXES=$("$DIR"/internal/prefix-list.sh)


COMMIT_MSG_ERROR=" ! Invalid commit message  "

main() {

  COMMIT_MSG=$(sed -n "/^[^#]/p" "$1")
  FIRST_LINE=$(echo "$COMMIT_MSG" | sed -n "/[^\w]*$/p" | sed "s/^ *//" | sed "s/\n//" | head)

  # COMMIT_WORD_COUNT=`cat $1 | sed -n "/^[^#]/p" | wc -w | sed "s/\w//"`
  # COMMIT_LINE_COUNT=`cat $1 | sed -n "/^[^#]/p" | wc -l | sed "s/\w//"`
  # echo $COMMIT_WORD_COUNT 
  # echo $COMMIT_LINE_COUNT
  
  # create regexp for first line of commit message -- [square brackets] are optional:      <prefix>[(scope)][!]:<description>
    # scope provides more details
    # ! indicates BREAKING CHANGES
  regexp="^($(echo "${MSG_PREFIXES[*]} ${OTHER_PREFIXES[*]}" | sed "s/ /|/g"))(\([a-zA-Z0-9 \-]*\))?\!?\:[A-Za-z0-9\._\-\s]*"

  # check that first line of message matches regexp
  if [[ ! $FIRST_LINE =~ $regexp ]]; then
    echo "$(tput setaf 1)$(tput setab 7)$COMMIT_MSG_ERROR$(tput sgr 0)"
    echo "  <prefix>:<description>"
    echo "prefix options: ($OTHER_PREFIXES ${MSG_PREFIXES[*]})"
    exit 1
  fi

}

main "$1"