#!/bin/bash

# A script to manage the installation of the drush script library.
#
# Drush, the Drupal Shell, is a script toolkit.  See: drupal.org/project/drush
# For most things, the Drupal Script Library, of which this script is a part,
# works better than Drush.  However, because Drush is written in PHP, it can provide
# easy access to the Drupal API.  This is very useful for calling the update process
# from the command line.
#
# This script will allow the installation and update of the Drush code.
# It is installed to a directory called 'drush' as a sub-directory to the directory
# holding this script.
#
# Drush requires PHP5.
# Script will look for PHP_HOME variable first, then look for php executable in path.
# The validate option will ensure that Drush is running with a valid version of PHP
#
# The script provides validation that Drush is installed correctly and that the
# correct version of PHP is available.

# include library file
. "`dirname ${0}`/drupalLibrary.sh"


# The tag used for Drush installation
DRUSH_GIT_TAG="master"

# Dumps out script usage
printUsage() {
	echo -e " "
	echo -e "Manages the installation of the Drush package."
	echo -e "For more info, see script header."
	echo -e " "
	echo -e "Usage: "
	echo -e "\t`basename $0` [-quiet] <install | update | findmods | validate >"
	echo -e " "
	echo -e "-quiet minimizes output."
	echo -e " "
	echo -e "install - Installs the Drush files, clobbering any previous installation."
	echo -e "update - Updates the Drush files."
	echo -e "findmods - Shows any mods to the checked-out Drush installation."
	echo -e "validate - Validates the Drush installation and PHP version."
	echo -e "\tOutputs an error message if problems detected; otherwise outputs nothing."
	echo -e "\tImplies '-quiet'"
	echo -e " "
}


#########

# Param handling
if [ $# -eq 0 ]; then
	printUsage
	exit 0
fi

# Handle flags
while (true); do
	case "${1}" in
	-quiet )
		pQuiet="-quiet"
		shift
		;;

	* )
		break
		;;
	esac
done

# All operations require the Drupal Scripts Library to be our cwd
cd "`dirname ${0}`" || {
	echo -e "** Unable to 'cd' to Drupal Scripts Library directory (!!).  Aborting.\n"
	exit 1
}

# Perform requested operation
case "${1}" in
install )
	if [ -z "${pQuiet}" ]; then
		echo " "
	fi

	# Remove old installation (if it exists)
	if [ -d "./drush" ]; then
		rm -rf "./drush" || {
			ehco -e "** Unable to remove old drush directory in Drupal Scripts Library directory.  Aborting.\n"
			exit 1
		}
	fi

	# Check out drush
	gitQuietFlag=""
	if [ -n "${pQuiet}" ]; then
		gitQuietFlag="-q"
	fi
	git clone ${gitQuietFlag} --depth 1 --branch ${DRUSH_GIT_TAG} "`makeGitURL ${DRUSH_PROJECT_NAME}`" "${DRUSH_INSTALL_DIR}" || {
		echo -e "** Error performing checkout of Drush module.  Aborting.\n"
		exit 1
	}
	;;

update | findmods )
	if [ -z "${pQuiet}" ]; then
		echo " "
	fi

	if [ ! -d "./${DRUSH_INSTALL_DIR}" ]; then
		echo -e "** Drush install directory '${DRUSH_INSTALL_DIR}' missing.  Aborting.\n"
		exit 1
	fi

	if [ "${1}" == "update" ]; then
		# update
# TODO Git Test need to test this
		cd "${DRUSH_INSTALL_DIR}" &&
		git pull -q || {
			echo -e "** Error performing update of Drush module.  Aborting.\n"
			exit 1
		}
	else
		# findmods
		findRepositoryUpdates "${DRUSH_INSTALL_DIR}"
	fi
	;;

validate )
	pQuiet="-quiet"
	drupalScriptLibraryDir="`dirname ${0}`"
	errorStr="`validateDrushInstallation "${drupalScriptLibraryDir}"`"
	if [ -n "${errorStr}" ]; then
		echo "** ${errorStr}"
	fi
	;;

* )
	echo -e "** Invalid operation parameter specified: '${1}'.  Aborting.\n"
	exit 1
esac

# Done
if [ -z "${pQuiet}" ]; then
	echo -e "\n** Done."
fi