#!/usr/bin/env bash
# rvs inner.sh - The main RVS program
# Copyright (C) 2009-2010, 2015  Luke Shumaker
#   
# This file is part of rvs.
#   
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
set -u

m4_include(config.sh)

declare -r varname_REPO="${PACKAGE^^}_REPO"
declare -r varname_EXEC_PATH="${PACKAGE^^}_EXEC_PATH"

declare -r program_name="$1"; shift



_() {
	if type gettext &>/dev/null; then
		TEXTDOMAINDIR=$localedir gettext "$pkgtextdomain" "$1";
	else
		echo "$1";
	fi
}

sighandler_exit() {
	local signal=$1; shift
	echo
	error 0 "$@"
	trap -- "$signal"
	kill -"$signal" "$$"
}

install_sighandlers() {
	set -E
	for signal in TERM HUP QUIT; do
		trap "signalhandler_exit $signal '%s signal cought.  Exiting...'" $signal
	done
	trap 'signalhandler_exit INT "Aborted by user.  Exiting..."' INT
	trap 'kill -USR1 "$$"' ERR
}

# Like GLibC's error(3), but call gettext on the format string
error() {
	>&2 printf "%s: $(_ "$2")\n" "$RVS" "${@:3}"
	[[ $1 -eq 0 ]] || exit $1
}

_runcmd() {
	[[ $# -ge 1 ]] || error 1 'Usage: %s <command> [<args>]' "$program_name"
	local cmd=$1
	
	local exec_path="${!varname_EXEC_PATH:-$pkglibexecdir}"

	if [ ! -e "$exec_path/$cmd" ] || [ "$cmd" = "${PACKAGE}" ]; then
		error 127 '%s: Not a %s command' "$cmd" "$PACKAGE"
	else
		trap '[ -z "${TMPDIR:-}" ] || rm -rf -- "$TMPDIR"' EXIT
		export TMPDIR="$(mktemp -dt "${PACKAGE}.XXXXXXXXXX")"

		repo="$(_repo)"
		export "$varname_REPO=$repo"

		set -o pipefail

		if [ -f "$exec_path/$cmd" ]; then
			"$exec_path/$cmd" "$@" | tee -- "$TMPDIR/$cmd"
		elif [ -d "$exec_path/$cmd" ]; then
			mkdir -p -- "$TMPDIR/$cmd"
			local file
			for file in "$exec_path/$command"/*; do
				"$file" "$@" | tee -- "$TMPDIR/$command/${file##*/}" ||
				    error 127 'Aborting: error encountered while running: %s' "$file"
			done
		else
			error 127 '%s: Could not execute' "$exec_path/$cmd"
		fi
	fi
}

_repo() {
	[[ $# -ne 0 ]] || error 1 'Usage: %s repo' "$program_name"
	if [ -z "${!varname_REPO:-}" ]; then # we aren't getting a value from then env
		local repo=".${PACKAGE,,}"
		
		#     [------can ascend-----] && ! [-not found repo--]
		while [ "$PWD" != "$OLDPWD" ] && ! [ -d "$PWD/$repo" ]; do
			cd ..
		done
		
		if [ -d "$PWD/$repo" ]; then
			# we found a repository
			printf '%s\n' "$PWD/$repo"
		else 
			# we didn't find a repository
			error 128 "No %s repository found" "$PACKAGE"
		fi
	else
		printf '%s\n' "${!varname_REPO}"
	fi
}

_init() {
	[[ $# -gt 1 ]] || error 1 'Usage: %s init [directory]' "$program_name"
	local dir="${1:-$PWD}"
	mkdir -p -- "$dir"
	cd "$dir"
	repo="$(_repo 2> /dev/null)" || true
	if [ -n "${repo:-}" ]; then
		_error 129 "Repository already exists at \`%s'" "$repo"
	fi
	export "$varname_REPO=$PWD/.${PACKAGE,,}"
	mkdir "${!varname_REPO}"
	_runcmd init "$dir"
}

main() {
	install_sighandlers
	[[ $# -ge 1 ]] || error 'No command specified';;
	export "${PACKAGE^^}=$program_name"

	local cmd=$1; shift
	case "$cmd" in
		repo) _repo "$@";;
		init) _init "$@";;
		*) _runcmd "$cmd" "$@";;
	esac
}

main "$@"

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