#!/usr/bin/env bash
# reset environment variables that could interfere with normal usage
unset GREP_OPTIONS
# put all utility functions here

# make a temporary file
git_extra_mktemp() {
    mktemp -t "$(basename "$0")".XXX
}

#
# check whether current directory is inside a git repository
#

is_git_repo() {
  git rev-parse --show-toplevel > /dev/null 2>&1
  result=$?
  if test $result != 0; then
    >&2 echo 'Not a git repo!'
    exit $result
  fi
}

is_git_repo

# extract current branch name
BRANCH=$(git rev-parse --abbrev-ref HEAD 2> /dev/null)

# get name of the most top folder of current directory, used for the
# output filename
ARCHIVE_NAME=$(basename $(pwd))

if [[ $BRANCH = tags* ]]; then
	BRANCH=$(git describe)
	echo Building for tag \"$BRANCH\"
	FILENAME=$ARCHIVE_NAME.$BRANCH.zip
else
	echo Building archive on branch \"$BRANCH\"
	# get a version string, so archives will not be overwritten when creating
	# many of them
	VERSION=$(git describe --always --long)
	# if not on master append branch name into the filename
	if [ "$BRANCH" = "master" ]; then
		FILENAME=$ARCHIVE_NAME.$VERSION.zip
	else
		FILENAME=$ARCHIVE_NAME.$VERSION.$BRANCH.zip
	fi
fi

# combine path and filename
OUTPUT=$(pwd)/$FILENAME

# building archive
git archive --format zip --output $OUTPUT $BRANCH

# also display size of the resulting file
echo Saved to \"$FILENAME\" \(`du -h $OUTPUT | cut -f1`\)
