install

#!/bin/bash

function usage {
	echo ""
	echo "Installs or updates dkr"
	echo ""
	echo "$0 [OPTIONS]"
	echo ""
	column -t -s':' <<< "
	--bin-file=${DKR_BIN_PATH} : The location the dkr bin file should be installed. This should be on the PATH.
	--bin-path=${DKR_BIN_DIR_PATH} : The location the built-in extention files should be installed to.
	: These will be deleted and reinstalled every time the install script is run.
	: User extensions should be put in the DKR_HOME directory instead.
	--home=${DKR_HOME} : The location user extention files should be put.
	--profile=${DKR_PROFILE} : The location of the user's bash profile file.
	: A simple 'source' line for the dkr profile file will be added to this file the first time the installer is run.
	--dkr-profile-file=${DKR_PROFILE_FILE} : The location the dkr profile should be installed to.
	: This file ensures that all the environment variables and functions required are available in the bash session.
	--docker-command=$(which docker) : The location of the docker bin.
	--debug : Prints debug information
	--help : Prints this help file.
	"
}

help=false
while [ "$1" != "" ]; do
	case "$1" in
		--bin-file)
			DKR_BIN_PATH="$2"
			shift
			;;
		--bin-path)
			DKR_BIN_DIR_PATH="$2"
			shift
			;;
		--home)
			DKR_HOME="$2"
			shift
			;;
		--profile)
			if [ "$DKR_PROFILE" != "$2" ] && [ "$DKR_PROFILE" != "" ]; then
				echo "WARNING: Cannot use flag '--profile' if it's been previously set. Ignoring."
			else
				DKR_PROFILE="$2"
			fi
			shift
			;;
		--dkr-profile-file)
			if [ "$DKR_PROFILE_FILE" != "$2" ] && [ "$DKR_PROFILE_FILE" != "" ]; then
				echo "WARNING: Cannot use flag '--dkr-profile-file' if it's been previously set. Ignoring."
			else
				DKR_PROFILE_FILE="$2"
			fi
			shift
			;;
		--docker-command)
			DKR_DOCKER_COMMAND="$2"
			shift
			;;
		--debug)
			set -x
			shift
			;;
		--no-pull)
			NO_PULL=true
			;;
		--help)
			help=true
			;;
		*)
			echo "Unknown flag: '$1'"
			exit 1
			;;
	esac
	shift
done

if [ "${DKR_BIN_DIR_PATH}" == "" ]; then
	if [ -d ~/bin ]; then
		DKR_BIN_DIR_PATH=~/bin/.dkr_builtins
	else
		DKR_BIN_DIR_PATH=/usr/local/var/dkr
	fi
fi
if [ "${DKR_BIN_PATH}" == "" ]; then
	if [ -d /usr/local/bin/dkr ]; then
		# for compatibility with existing installs
		DKR_BIN_PATH=/usr/local/bin/dkr
	else
		DKR_BIN_PATH=~/bin/dkr
	fi
fi
if [ "${DKR_HOME}" == "" ]; then
	DKR_HOME=~/.dkr
fi
if [ "${DKR_PROFILE}" == "" ]; then
	if [ -f ~/.bashrc ]; then
		DKR_PROFILE=~/.bashrc
	else
		DKR_PROFILE=~/.profile
	fi
fi
if [ "${DKR_PROFILE_FILE}" == "" ]; then
	DKR_PROFILE_FILE=~/.dkrprofile
fi
if [ "${DKR_DOCKER_COMMAND}" == "" ]; then
	DKR_DOCKER_COMMAND="$(which docker)"
fi

if [ "${help}" == "true" ]; then
	export DKR_BIN_DIR_PATH
	export DKR_BIN_PATH
	export DKR_HOME
	export DKR_PROFILE
	export DKR_PROFILE_FILE
	export DKR_DOCKER_COMMAND
	usage
	exit 0
fi

if [ -d .git ]; then
	if [ "${NO_PULL}" != "true" ]; then
		echo "Attempting to update the repo."
		git pull 1> /dev/null 2> /dev/null
		if [ "$?" != "0" ]; then
			echo "Unable to update repo. There are probably local changes that conflict."
		fi
	fi
fi

2>/dev/null 1>/dev/null grep '# ADDED BY DKR' "${DKR_PROFILE}"
if [ "$?" == "0" ]; then
	echo "Detected dkr was previously installed."
	installed=true
else
	installed=false
fi

# Older version of dkr installed by linking things. Make sure the links are gone.
2>/dev/null 1>/dev/null unlink "${DKR_BIN_DIR_PATH}"
2>/dev/null 1>/dev/null unlink "${DKR_BIN_PATH}"

rm -rf "${DKR_BIN_DIR_PATH}"
rm -f "${DKR_BIN_PATH}"

mkdir -p "${DKR_HOME}"
mkdir -p "${DKR_BIN_DIR_PATH}"

cp dkr "${DKR_BIN_PATH}"
cp home/* "${DKR_BIN_DIR_PATH}"

if [ "${installed}" != "true" ]; then
	if [ ! -f "${DKR_PROFILE}" ]; then
		echo "WARNING: ${DKR_PROFILE} doesn't exist. It will be created."
	fi

	echo "# ADDED BY DKR" >> ${DKR_PROFILE}
	echo "if [ -f \"${DKR_PROFILE_FILE}\" ]; then" >> ${DKR_PROFILE}
	echo "	source \"${DKR_PROFILE_FILE}\"" >> ${DKR_PROFILE}
	echo "fi" >> ${DKR_PROFILE}
fi

# (Re)generate the DKR_PROFILE_FILE which should be sourced into the bash profile
echo "export DKR_HOME=\"${DKR_HOME}\"" > "${DKR_PROFILE_FILE}"
echo "export DKR_BIN_DIR_PATH=\"${DKR_BIN_DIR_PATH}\"" >> "${DKR_PROFILE_FILE}"
echo "export DKR_BIN_PATH=\"${DKR_BIN_PATH}\"" >> "${DKR_PROFILE_FILE}"
echo "export DKR_PROFILE=\"${DKR_PROFILE}\"" >> "${DKR_PROFILE_FILE}"
echo "export DKR_PROFILE_FILE=\"${DKR_PROFILE_FILE}\"" >> "${DKR_PROFILE_FILE}"
echo "export DKR_DOCKER_COMMAND=\"${DKR_DOCKER_COMMAND}\"" >> "${DKR_PROFILE_FILE}"

cat profileFile >> "${DKR_PROFILE_FILE}"

echo "Successfully installed dkr to \"${DKR_BIN_PATH}\". You may need to restart your bash session or run:"
echo ""
echo "source \"${DKR_PROFILE_FILE}\""
echo ""