#!/bin/bash
#
# pre-receive hook for Commit Check
#

COMPANY_EMAIL="mycorp.org"

readonly PROGNAME=$(basename $0)
readonly PROGDIR=$(readlink -m $(dirname $0))

check_single_commit()
{
  #
  # Put here any logic you want for your commit
  #
  # COMMIT_MESSAGE contains commit message
  # COMMIT_AUTHOR contains commit author (without email)
  #
  # Set COMMIT_CHECK_STATUS to non zero to indicate an error
  if [[ "$COMMIT_MESSAGE" =~ ^(refacto|feat|test|fix|style|docs|chore|perf):[[:space:]].*$  ]]
  then
    COMMIT_CHECK_STATUS=0
    echo "Commit message is conform."
  else
    COMMIT_CHECK_STATUS=1
    echo "Commit message \"$COMMIT_MESSAGE\" is not conform."
    echo "The push has been refused by the server."
    echo "You can change you commit message with the command: git commit --amend -m \"<NEW MESSAGE>\""
  fi
}

check_all_commits()
{
  if [ "$OLD_REVISION" = "0000000000000000000000000000000000000000" ]
  then
    OLD_REVISION=$NEW_REVISION
  fi
  REVISIONS=$(git rev-list $OLD_REVISION..$NEW_REVISION)
  IFS='\n' read -ra LIST_OF_REVISIONS <<< "$REVISIONS"

  for rid in "${!LIST_OF_REVISIONS[@]}"; do
    REVISION=${LIST_OF_REVISIONS[rid]}
    COMMIT_MESSAGE=$(git cat-file commit $REVISION | sed '1,/^$/d')
    COMMIT_AUTHOR=$(git cat-file commit $REVISION | grep committer | sed 's/^.* \([^@ ]\+@[^ ]\+\) \?.*$/\1/' | sed 's/<//' | sed 's/>//' | sed 's/@$COMPANY_EMAIL//')
    check_single_commit

    if [ "$COMMIT_CHECK_STATUS" != "0" ]; then
      echo "Commit validation failed for commit $REVISION ($COMMIT_AUTHOR)" >&2
      exit 1
    fi

  done
}

# Get custom commit message format
while read OLD_REVISION NEW_REVISION REFNAME ; do
  check_all_commits
done

exit 0