From 071933646ef80fff6295b581376d018ba8ddc39a Mon Sep 17 00:00:00 2001
From: rbuj <robert.buj@gmail.com>
Date: Mon, 18 Jan 2021 21:39:36 +0100
Subject: Support xscreensaver when mate-screensaver is not available

---
 mate-session/gsm-inhibit-dialog.c | 23 +++++++++++++++++------
 mate-session/gsm-manager.c        | 36 ++++++++++++++++++++++++------------
 mate-session/gsm-util.c           | 27 +++++++++++++++++++++++++++
 mate-session/gsm-util.h           |  2 ++
 4 files changed, 70 insertions(+), 18 deletions(-)

diff --git a/mate-session/gsm-inhibit-dialog.c b/mate-session/gsm-inhibit-dialog.c
index a4e86e8..c79fa18 100644
--- a/mate-session/gsm-inhibit-dialog.c
+++ b/mate-session/gsm-inhibit-dialog.c
@@ -91,13 +91,24 @@ G_DEFINE_TYPE (GsmInhibitDialog, gsm_inhibit_dialog, GTK_TYPE_DIALOG)
 static void
 lock_screen (GsmInhibitDialog *dialog)
 {
-        GError *error;
-        error = NULL;
-        g_spawn_command_line_async ("mate-screensaver-command --lock", &error);
-        if (error != NULL) {
-                g_warning ("Couldn't lock screen: %s", error->message);
-                g_error_free (error);
+        gchar **screen_locker_command;
+
+        if ((screen_locker_command = gsm_get_screen_locker_command ()) != NULL) {
+                GError *error = NULL;
+
+                g_spawn_async (NULL, screen_locker_command, NULL, G_SPAWN_DEFAULT,
+                               NULL, NULL, NULL, &error);
+
+                if (error != NULL) {
+                        g_warning ("Couldn't lock screen: %s", error->message);
+                        g_error_free (error);
+                }
+
+        } else {
+                g_warning ("Couldn't find any screen locker");
         }
+
+        g_strfreev (screen_locker_command);
 }
 
 static void
diff --git a/mate-session/gsm-manager.c b/mate-session/gsm-manager.c
index 817688a..4be8eb0 100644
--- a/mate-session/gsm-manager.c
+++ b/mate-session/gsm-manager.c
@@ -1224,21 +1224,33 @@ sleep_lock_is_enabled (GsmManager *manager)
 static void
 manager_perhaps_lock (GsmManager *manager)
 {
-        GError   *error;
-        gboolean  ret;
+        gchar **screen_locker_command;
 
-        /* only lock if mate-screensaver is set to lock */
-        if (!sleep_lock_is_enabled (manager)) {
-                return;
-        }
+        if ((screen_locker_command = gsm_get_screen_locker_command ()) != NULL) {
+                GError *error = NULL;
 
-        /* do this sync to ensure it's on the screen when we start suspending */
-        error = NULL;
-        ret = g_spawn_command_line_sync ("mate-screensaver-command --lock", NULL, NULL, NULL, &error);
-        if (!ret) {
-                g_warning ("Couldn't lock screen: %s", error->message);
-                g_error_free (error);
+                /* only lock if mate-screensaver is set to lock */
+                if (!g_strcmp0 (screen_locker_command[0], "mate-screensaver-command") &&
+                    !sleep_lock_is_enabled (manager)) {
+                        goto clear_screen_locker_command;
+                }
+
+                /* do this sync to ensure it's on the screen when we start suspending */
+                g_spawn_sync (NULL, screen_locker_command, NULL, G_SPAWN_DEFAULT,
+                              NULL, NULL, NULL, NULL, NULL, &error);
+
+                if (error) {
+                        g_warning ("Couldn't lock screen: %s", error->message);
+                        g_error_free (error);
+                }
+
+        } else {
+                g_warning ("Couldn't find any screen locker");
         }
+
+clear_screen_locker_command:
+
+        g_strfreev (screen_locker_command);
 }
 
 static void
diff --git a/mate-session/gsm-util.c b/mate-session/gsm-util.c
index a769d8c..76bf9cd 100644
--- a/mate-session/gsm-util.c
+++ b/mate-session/gsm-util.c
@@ -38,6 +38,33 @@
 
 static gchar *_saved_session_dir = NULL;
 
+gchar **
+gsm_get_screen_locker_command (void)
+{
+        const char *screen_locker_command[] = {
+                "mate-screensaver-command --lock",
+                "xscreensaver-command -lock",
+                NULL
+        };
+        gchar **screen_locker_argv = NULL;
+        gsize   i;
+
+        for (i = 0; screen_locker_command[i] != NULL && screen_locker_argv == NULL; i++) {
+                gchar **argv;
+                char   *path;
+
+                argv = g_strsplit (screen_locker_command [i], " ", -1);
+                path = g_find_program_in_path (argv[0]);
+                if (path)
+                        screen_locker_argv = g_strdupv (argv);
+
+                g_free (path);
+                g_strfreev (argv);
+        }
+
+        return screen_locker_argv;
+}
+
 char *
 gsm_util_find_desktop_file_for_app_name (const char *name,
                                          char      **autostart_dirs)
diff --git a/mate-session/gsm-util.h b/mate-session/gsm-util.h
index dcec60e..d1c3c5c 100644
--- a/mate-session/gsm-util.h
+++ b/mate-session/gsm-util.h
@@ -29,6 +29,8 @@ extern "C" {
 
 #define IS_STRING_EMPTY(x) ((x)==NULL||(x)[0]=='\0')
 
+gchar**     gsm_get_screen_locker_command           (void);
+
 char *      gsm_util_find_desktop_file_for_app_name (const char  *app_name,
                                                      char       **dirs);
 
-- 
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