#!/bin/sh

set -e

SCRIPT="$(readlink -f "$0")"
TARGET="${SCRIPT}.real"

main() {
	# Some (old?) versions of git provided the compiled script.
	d="/usr/share/doc/git/contrib/diff-highlight"
	if [ -x "${d}/diff-highlight" ] ; then
		exec "${d}/diff-highlight"
	fi

	# See if we need to bootstrap first.
	if [ ! -x "${TARGET}" ] && [ -e "${d}" ] ; then
		(
		echo "#!/usr/bin/env perl"
		cat "${d}/DiffHighlight.pm" "${d}/diff-highlight.perl"
		) >"${TARGET}"
		chmod a+rx "${TARGET}"
	fi

	# If we've already bootstrapped, use it.
	if [ -x "${TARGET}" ] ; then
		exec "${TARGET}" "$@"
	elif [ -x "/usr/bin/diff-highlight" ] ; then
		exec /usr/bin/diff-highlight "$@"
	else
		# Fallback so .gitconfig setings always work.
		exec cat
	fi
}

main "$@"