#!@SHELL@
name='@name@'
ver='0.7.3'
#   Copyright (C) 2009 Luke Shumaker
#   
#   This file is part of rvs.
#   
#   rvs is free software; you can redistribute it and/or modify it under the
#   terms of the GNU General Public License as published by the Free Software
#   Foundation; either version 2, or (at your option) any later version.
#   
#   rvs 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 General Public License for more details.
#   
#   You should have received a copy of the GNU General Public License
#   along with rvs; see the file COPYING.
#   If not, write to the Free Software Foundation,
#   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

RVS="$0" #RVS="@rvs@"
libexecdir="@libexecdir@/$name"

_error() {
	echo "$name: $1" >> /dev/stderr
	exit 1
}

_repo() {
	repo=".$name"
	pwd=`pwd`
	owd="$pwd"
	
	while [ "$pwd" != "`pwd`" ] && [ ! -e "`pwd`/$repo" ]; do
		pwd=`pwd`
		cd ..
	done
	
	if [ -e "`pwd`/$repo" ]; then
		echo "`pwd`/$repo"
	else 
		_error "no $name repository found"
	fi
	cd "$owd"
}

_init() {
	repo=`_repo 2> /dev/null`
	if [ -z "$repo" ]; then
		repo=".$name"
		install -d "$repo"
		install -T $libexecdir/plugins $repo/plugins
		while read plugin; do
			echo "initializing plugin \`$plugin'"
			install -d "$repo/$plugin"
			export REPO=.rvs/$plugin
			if [ -e "$libexecdir/$plugin/init" ]; then
				"$libexecdir/$plugin/init"
			fi
		done < $repo/plugins
	else
		_error "repository already exists at \`$repo'"
	fi
}

_install() {
	id=$1
	dir=${2-$id}
	name=`echo $id | sed 's/-.*$//'`
	if (grep "^$name-" "$libexecdir/plugins" &> /dev/null); then
		# an entry for this plugin already exists, though possibly a
		# different version
		sed -i "s/^$name-.*$/$id/" "$libexecdir/plugins"
	else
		echo "$id" >> "$libexecdir/plugins"
	fi
	rm -rf         "$libexecdir/$id"
	cp -rpT "$dir" "$libexecdir/$id"
}

_uninstall() {
	id=$1
	sed -i "/^$id$/ d" "$libexecdir/plugins"
	rm -rf "$libexecdir/$id"
}

_treebranch() {
	branch="$1"
	for com in "$branch"; do
		var="r_$com"
		if [ -z "\$$var" ]; then
			exec r$var="`$libexecdir/$com $param`"
			var="_$com"
			_treebranch "\$$var"
		else
			_error "plugin dependancy loop detected"
		fi
	done
}

_runcom() {
	com="$1"
	tmp_mast="`tempfile`"
	# bash optimized version
	#grep -E "^$com(:.*)?$" "$libexecdir/*/plugin.conf" | sed \
	#	-e 's/\#.*//' \
	#	-e "s:^${libexecdir//':'/'\:'}/::" \
	#	-e 's@plugin.conf\:@@' > "$tmp_mast"
	# POSIX version
	grep -E "^$com(:.*)?$" $libexecdir/*/plugin.conf | sed \
		-e 's/\#.*//' \
		-e "s:^`echo "$libexecdir" |sed 's@:@\\:@g'`/::" \
		-e 's@plugin.conf\:@@' > "$tmp_mast"
	
	# start processing-------------------------------------------
	if [ "`wc -c < "$tmp_mast"`" = '0' ]; then
		_error "unrecognized command \`$com'"
	else
		# create tree
		tmp_work="`tempfile`"
		lev1="`sed \
			-e "/\:/w  '$tmp_work'" \
			-e '/\:/d' "$tmp_mast"`"
		while read line; do
			com="`echo "$line" | sed 's/\:.*$/'`"
			dep="_`echo "$line" | sed 's/.*\:$/'`"
			# bash optimized version
			#	eval $dep=\"${!dep} $com\"
			# POSIX version
				eval $dep=\"\$$dep $com\"
		done < "$tmp_work"
		rm "$tmp_work"
		
		# cycle through tree
		_treebranch "$lev1"
	fi
	rm "$tmp_mast"
}

# START OPTION HANDLING #
com=$1;
# END   OPTION HANDLING #
case "$com" in
	'') _error 'no command specified';;
	# 'repo') _repo; exit $?;;
	'init') _init; exit $?;;
	  'install') shift;   _install $@; exit $?;;
	'uninstall') shift; _uninstall $@; exit $?;;
	*)	repo=`_repo`
		if [ "$?" = '0' ]; then
			shift
			param="$@"
			_runcom
			exit $?
		else
			_error "cannot find an existing repository"
		fi
	:;;
esac

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