add pamac-cache-clean and save cache options

src/pamac-clean-cache/clean_cache.vala

@@ -0,0 +1,33 @@
+/*
+ *  pamac-vala
+ *
+ *  Copyright (C) 2017 Chris Cromer <cromer@cromnix.org>
+ *  Copyright (C) 2014-2017 Guillaume Benoit <guillaume@manjaro.org>
+ *
+ *  This program 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 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 General Public License for more details.
+ *
+ *  You should have received a get of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+int main () {
+	var pamac_config = new Pamac.Config ("/etc/pamac.conf");
+	string rm_only_uninstalled_str = "";
+	if (pamac_config.rm_only_uninstalled) {
+		rm_only_uninstalled_str = "-u";
+	}
+	try {
+		Process.spawn_command_line_sync ("paccache -q --nocolor %s -r -k %llu".printf (rm_only_uninstalled_str, pamac_config.keep_num_pkgs));
+	} catch (SpawnError e) {
+		stderr.printf ("SpawnError: %s\n", e.message);
+	}
+	return 0;
+}