feat: add 'XScreenSaver' plugin

meson_options.txt

@@ -0,0 +1,5 @@
+option('enable-xscreensaver-plugin',
+  type: 'boolean',
+  value: true,
+  description: 'Build plugin for XScreenSaver support'
+)

plugins/XScreenSaverPlugin/Main.vala

@@ -0,0 +1,115 @@
+class Caffeine.Plugins.XScreenSaver : Peas.ExtensionBase, Peas.Activatable {
+    private uint source_id = 0U;
+    private int timeout_duration = 0;
+    private int timeout_offset = -5;
+    private File xscreensaver_preferences_file;
+
+    public Object object { owned get; construct; }
+
+    public XScreenSaver () {
+        Object ();
+    }
+
+    construct {
+        xscreensaver_preferences_file = File.new_build_filename (
+            Environment.get_home_dir (), ".xscreensaver");
+
+        if (!xscreensaver_preferences_file.query_exists ())
+            error ("~/.xscreensaver not found.");
+
+        var xscreensaver_preferences_file_monitor = xscreensaver_preferences_file.monitor_file (FileMonitorFlags.NONE, null);
+
+        xscreensaver_preferences_file_monitor.changed.connect ((src, dest, event) => {
+            if (event == FileMonitorEvent.CHANGED)
+                on_xscreensaver_preferences_file_updated ();
+        });
+
+        on_xscreensaver_preferences_file_updated ();
+
+        this.notify["timeout_duration"].connect (() => {
+            if (source_id == 0U)
+                deactivate_screensaver ();
+        });
+    }
+
+    public void activate () {
+        deactivate_screensaver ();
+    }
+
+    public void deactivate () {
+        if (source_id != 0U) {
+            Source.remove (source_id);
+            source_id = 0U;
+        }
+    }
+
+    public void update_state () {}
+
+    private void deactivate_screensaver (int? interval = null) {
+        if (interval == null)
+            interval = timeout_duration;
+
+        if (source_id != 0U)
+            Source.remove (source_id);
+
+        source_id = Timeout.add_seconds (interval + timeout_offset, () => {
+            var success = false;
+            string[] spawn_args = { "xscreensaver-command", "-deactivate" };
+            string[] spawn_env = Environ.get ();
+
+            try {
+                Process.spawn_sync (
+                    Environment.get_home_dir (),
+                    spawn_args,
+                    spawn_env,
+                    SpawnFlags.SEARCH_PATH,
+                    null,
+                    null);
+
+                success = true;
+            } catch (Error err) {
+                error (@"unable to spawn process");
+            }
+
+            return success;
+        });
+    }
+
+    private void on_xscreensaver_preferences_file_updated () {
+        try {
+            var dis = new DataInputStream (
+                xscreensaver_preferences_file.read ());
+
+            string line;
+            while ((line = dis.read_line (null)) != null) {
+                string[] preference = line.split (":", 2);
+                unowned string key = preference[0];
+
+                if (key.strip () == "timeout") {
+                    int timeout_duration = -1;
+                    string[] time = preference[1].split (":");
+
+                    for (int i = 0 ; i < time.length ; i++)
+                        timeout_duration += int.parse (time[i].strip ()) * (i == (time.length - 1) ? 1 : 60);
+
+                    if (timeout_duration != -1)
+                        this.timeout_duration = timeout_duration;
+
+                    break;
+                }
+            }
+        } catch (Error err) {
+            error ("unable to parse preferences file");
+        }
+    }
+
+}
+
+[ModuleInit]
+public void peas_register_types (GLib.TypeModule module) {
+    Peas.ObjectModule object_module = module as Peas.ObjectModule;
+
+    object_module.register_extension_type (
+        typeof (Peas.Activatable),
+        typeof (Caffeine.Plugins.XScreenSaver));
+}

plugins/XScreenSaverPlugin/meson.build

@@ -0,0 +1,19 @@
+shared_library('xscreensaver',
+  [
+    'Main.vala'
+  ],
+  dependencies: [
+    libpeas_dep
+  ],
+  install: true,
+  install_dir: join_paths(pkgpluginslibdir, 'xscreensaver'),
+)
+
+i18n.merge_file(
+  type: 'desktop',
+  input: 'xscreensaver.plugin.in',
+  output: 'xscreensaver.plugin',
+  po_dir: po_dir,
+  install: true,
+  install_dir: join_paths(pkgpluginslibdir, 'xscreensaver')
+)

plugins/XScreenSaverPlugin/xscreensaver.plugin.in

@@ -0,0 +1,6 @@
+[Plugin]
+Module=xscreensaver.so
+Name=XScreenSaver
+Description=XScreenSaver support for Caffeine.
+Authors=Payson Wallach <payson@paysonwallach.com>
+Copyright=Copyright © 2020 Payson Wallach

plugins/meson.build

@@ -0,0 +1,3 @@
+if get_option('enable-xscreensaver-plugin')
+  subdir('XScreenSaverPlugin')
+endif