# Read parameters
COMMIT_MSG_FILE=$1
COMMIT_SOURCE=$2
SHA1=$3

# Set failing on command fail, and undefined variable use
set -eu

# This hook is invoked by git-commit right after preparing
# the default log message, and before the editor is started.

# It takes one to three parameters.

# The first is the name of the file that contains the commit log message.
# The second is the source of the commit message, and can be:
#   * message (if a -m or -F option was given);
#   * template (if a -t option was given or the configuration option
#               commit.template is set);
#   * merge (if the commit is a merge or a .git/MERGE_MSG file exists);
#   * squash (if a .git/SQUASH_MSG file exists);
#   * commit (if a -c, -C or --amend option was given)
# The third is a commit object name if source is commit.

# If the exit status is non-zero, git commit will abort.
# The purpose of the hook is to edit the message file in place,
# and it is not suppressed by the --no-verify option. A non-zero
# exit means a failure of the hook and aborts the commit. It
# should not be used as a replacement for the pre-commit hook.

# The sample prepare-commit-msg hook that comes with Git removes
# the help message found in the commented portion of the commit template.

# We use this hook to run "cz", that forces the build of a
# semantic commit message through a prompt.

# Show welcome message
echo "**************************"
echo "Generate commit message"
echo "**************************"
echo ""

# Check if we are doing an amend
if [ "$COMMIT_SOURCE" = 'commit' ] && [ -n $SHA1 ]; then
    # Amends do not call the "cz" command.
    exit 0
fi

# Check if we are doing an squash
if [ "$COMMIT_SOURCE" = 'squash' ]; then
    # Squashes should not trigger the cz command.
    exit 0
fi

# Check if we are doing an merge
if [ "$COMMIT_SOURCE" = 'merge' ]; then
    # Merging should not trigger the cz command.
    exit 0
fi

# Check if we are using a template
if [ "$COMMIT_SOURCE" = 'template' ]; then
    # Cannot use templates, warn the user and fail.
    echo "Setting a template through -t or commit.template in this project "
    echo "has been disabled. Please run a simple commit.\n"
    exit 1
fi

# Check if a message was given
if [ "$COMMIT_SOURCE" = 'message' ]; then
    # Cannot use message, warn the user and fail.
    echo "Setting a message through -m or -F option in this project "
    echo "has been disabled. Please run a simple commit.\n"
    exit 1
fi

# Regular commit has been performed, run the command.
exec < /dev/tty && npx cz --hook || true