add epm whatdepends command

bin/epm

@@ -169,6 +169,9 @@ check_command()
     provides)             # HELPCMD: print package provides
         epm_cmd=provides
         ;;
+    whatdepends)          # HELPCMD: print packages dependences on that
+        epm_cmd=whatdepends
+        ;;
     -qa|list|packages|-l) # HELPCMD: list of installed package(s)
         epm_cmd=packages
         ;;

bin/epm-whatdepends

+#!/bin/sh
+#
+# Copyright (C) 2013  Etersoft
+# Copyright (C) 2013  Vitaly Lipatov <lav@etersoft.ru>
+#
+# 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/>.
+#
+
+epm_whatdepends()
+{
+	local CMD
+	[ -n "$pkg_names" ] || fatal "Run query without names"
+
+# by package name
+case $PMTYPE in
+	apt-rpm|apt-dpkg)
+		CMD="apt-cache whatdepends"
+		;;
+	*)
+		fatal "Do not known command for $PMTYPE"
+		;;
+esac
+
+[ -n "$pkg_names" ] && docmd $CMD $pkg_names
+
+}