#!/bin/bash
# A meta micro manager for the masses.
# USAGE:
#     gimme [-f|--force] stuff
#     gimme [-l|--list|--installed]
#     gimme [--old|--outdated]
#     gimme [-v|--verbose|--debug]
#     gimme [-h|--help|help]
###############################################################################

[ "$GIMME_URL" ]         ||  export GIMME_URL="https://github.com/KylePDavis/gimme"
[ "$GIMME_DIR" ]         ||  export GIMME_DIR="$HOME/.gimme"
[ "$GIMME_GIMMES_DIR" ]  ||  export GIMME_GIMMES_DIR="$GIMME_DIR/gimmes"
[ "$GIMME_LINK" ]        ||  export GIMME_LINK="$HOME/bin/gimme"
[ "$GIMME_LINK_DIR" ]    ||  export GIMME_LINK_DIR=$(dirname "$GIMME_LINK")
[ "$GIMMES" ]            ||  export GIMMES=""
[ "$INIT_GIMMES" ]       ||  export INIT_GIMMES=""
[ "$OS" ]                ||  export OS=$(uname -s)
[ "$DEBUG" ]             ||  export DEBUG=
[ "$FORCE" ]             ||  export FORCE=

###############################################################################
! [[ "$DEBUG" ]] || set -x

has() {
	if [[ "$FORCE" ]] && echo " $INIT_GIMMES " | grep -q " $1 "; then
		false
	else
		which "$1" >/dev/null
	fi
}

gimme_pkg() {
	if [[ "$OS" = "Darwin" ]]; then
		if brew cask cat "$1" &>/dev/null; then
			if brew cask list "$1" &>/dev/null; then
				if [[ "$FORCE" ]]; then
					brew cask reinstall "$@"
				else
					echo "# SKIPPED: $GIMME  (force reinstall/upgrade via:  gimme -f $GIMME)"
				fi
			else
				brew cask install "$@"
			fi
		elif brew cat "$1" &>/dev/null; then
			if brew list "$1" &>/dev/null; then
				if [[ "$FORCE" ]]; then
					brew upgrade "$@"  ||  echo "# WARN: forced upgrade failed (it may already be up to date)"
				else
					echo "# SKIPPED: $GIMME  (force upgrade via:  gimme -f $GIMME)"
				fi
			else
				brew install "$@"
			fi
		else
			brew search "$1"
		fi
	else
		sudo apt-get -y install "$@"
	fi
}

if [[ "$0" =~ [-]?bash ]]; then # sourced or piped

	if [[ "${BASH_SOURCE[@]}" ]]; then # sourced

		_gimme_completely() {
			if [[ "$2" = -* ]]; then
				COMPREPLY=( $(compgen -W "-v --verbose --debug --force --version --help -l --list --installed --old --outdated" -- "$2") )
			else
				COMPREPLY=( $(find "$GIMME_GIMMES_DIR" -type f -path "$GIMME_GIMMES_DIR/$2*" \! -name '.*' | cut -c$(( ${#GIMME_GIMMES_DIR} + 2))- ) )
			fi
		}

		complete -F _gimme_completely gimme

	else # piped

		set -o errexit -o pipefail

		# gimmes/gcc: inlined for curl-based installs
		if [[ "$OS" = "Darwin" ]]; then
			if ! "xcode-select" --version &>/dev/null; then
				echo "Try again after installing the Xcode command-line tools by running:  xcode-select --install"
				exit 1
			fi
			if ! xcodebuild -help &>/dev/null; then
				echo "Try again after agreeing to the Xcode license by running:  sudo xcodebuild -license"
				exit 1
			fi
		else
			has gcc  ||  gimme_pkg build-essential
		fi

		# gimmes/git: inlined for curl-based installs
		has git  ||  gimme_pkg git

		if ! [[ -d "$GIMME_DIR" ]]; then

			echo "Installing $GIMME_DIR/gimme ..."
			mkdir -p "$GIMME_DIR"
			git clone "$GIMME_URL" "$GIMME_DIR"
			mkdir -p "$(dirname "$GIMME_LINK")"
			ln -sf "$GIMME_DIR/gimme" "$GIMME_LINK"
			echo "Done! Now you can 'gimme stuff' or 'gimme dev/stuff' or even 'gimme gimme'!"

		else

			echo "Updating gimme (in $GIMME_DIR) ..."
			cd "$GIMME_DIR"
			OLD_REV=$(git rev-parse HEAD)
			git pull
			git log --oneline "$OLD_REV.."

		fi

	fi

else # normal usage

	set -o errexit -o pipefail

	export -f has gimme_pkg

	[[ "$INIT_GIMMES" ]] || export INIT_GIMMES="$@"

	DID_GIMME=
	for GIMME; do

		case "$GIMME" in
			-v|--verbose|--debug)
				DEBUG=1
				continue
				;;
			-f|--force)
				FORCE=1
				continue
				;;
			--version)
				echo "Version:"
				git log -1
				exit 0
				;;
			-h|--help|"")
				sed -n -e'/^#[[:space:]]/p' -e'/^###/q' "$0"
				echo "# GIMMES:"
				echo $(cd "$GIMME_GIMMES_DIR"; find . -type f -perm +1 | sed -e's/^..//' -e'/^_/d' | sort)
				exit 0
				;;
			-l|--list|--installed)
				echo "# BREW (cask):"
				brew cask list
				echo
				echo "# BREW:"
				brew list
				echo
				echo "# NPM:"
				npm -g ls --depth 0
				echo
				echo "# PIP:"
				pip list --format=columns
				exit 0
				;;
			--old|--outdated)
				echo "# BREW (cask):"
				brew cask outdated
				echo
				echo "# BREW:"
				brew outdated
				echo
				echo "# NPM:"
				npm outdated -g --depth 0
				echo
				echo "# PIP:"
				pip list --format=columns --outdated
				exit 0
				;;
		esac

		! [[ "$DEBUG" ]] || set -x

		echo "# WANT: $GIMME"
		! [[ "$GIMMES" == *" $GIMME "* ]]  ||  exit 0
		export GIMMES+=" $GIMME " GIMME

		P="$GIMME_GIMMES_DIR/$GIMME"

		if ! [[ -f "$P" ]]; then
			# find _default handler
			while P=$(dirname "$P") && [[ "$P" = "$GIMME_GIMMES_DIR"* ]]; do
				if [[ -f "$P/_default" ]]; then
					P="$P/_default"
					break;
				fi
			done
			# no default
			if ! [[ "$P" = "$GIMME_GIMMES_DIR"* ]]; then
				echo "# ERROR: Unable to find $GIMME_GIMMES_DIR/_default handler"
				exit 1
			fi
		fi

		if [[ -x "$P" ]]; then
			DID_GIMME=1
			[[ "$PATH" = "$LINK_DIR"* ]]  ||  export PATH="$LINK_DIR:$PATH"
			if (if [[ "$DEBUG" ]]; then bash -x "$P"; else bash "$P"; fi); then
				echo "# DONE: $GIMME"
			else
				OUCH=$?
				echo "# FAIL: Error for gimme \"$GIMME\" (EXIT_CODE=$OUCH)"
				exit $OUCH
			fi
		else
			echo "# WARN: the gimme \"$GIMME\" was SKIPPED because \"$P\" is not marked executable!"
		fi

	done

	[[ "$DID_GIMME" ]]  ||  echo "# WARN: nothing to do... try:  gimme --help"
fi