From 8dfc61bf04dfc5e5977a5dd7aa2981c8fd609b3b Mon Sep 17 00:00:00 2001
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Date: Fri, 15 Sep 2023 12:46:24 +0200
Subject: Introduce gsettings (list): includeonly-sessions, excluded-sessions.

---
 .../org.ArcticaProject.arctica-greeter.gschema.xml |  8 ++++++
 src/arctica-greeter.vala                           | 31 ++++++++++++++++++++++
 src/settings.vala                                  |  2 ++
 3 files changed, 41 insertions(+)

diff --git a/data/org.ArcticaProject.arctica-greeter.gschema.xml b/data/org.ArcticaProject.arctica-greeter.gschema.xml
index ddef373..db00737 100644
--- a/data/org.ArcticaProject.arctica-greeter.gschema.xml
+++ b/data/org.ArcticaProject.arctica-greeter.gschema.xml
@@ -219,5 +219,13 @@
       <default>60</default>
       <summary>Time in seconds until the shutdown dialog forcefully selects the default action. Set to 0 to disable.</summary>
     </key>
+    <key name="includeonly-sessions" type="as">
+      <default>[]</default>
+      <summary>Unordered list of include-only desktop sessions (if non-empty, only explicitly listed sessions types will be offered by the greeter). Takes precedence over the excluded-sessions list.</summary>
+    </key>
+    <key name="excluded-sessions" type="as">
+      <default>[]</default>
+      <summary>Unordered list of excluded desktop sessions (if non-empty, listed sessions types will not be offered by the greeter). Only used if includeonly-sessions is empty.</summary>
+    </key>
   </schema>
 </schemalist>
diff --git a/src/arctica-greeter.vala b/src/arctica-greeter.vala
index cacfdac..0aee212 100644
--- a/src/arctica-greeter.vala
+++ b/src/arctica-greeter.vala
@@ -254,8 +254,19 @@ public class ArcticaGreeter : Object
             sessions.append (preferred_session);
         }
 
+        var excluded_sessions = AGSettings.get_strv (AGSettings.KEY_EXCLUDED_SESSIONS);
+        var includeonly_sessions = AGSettings.get_strv (AGSettings.KEY_INCLUDEONLY_SESSIONS);
+
         if (!AGSettings.get_boolean (AGSettings.KEY_HIDE_WAYLAND_SESSIONS)) {
             foreach (string session in sessions) {
+                if (includeonly_sessions.length > 0) {
+                    if (!(session in includeonly_sessions)) {
+                        continue;
+                    }
+                }
+                else if (session in excluded_sessions) {
+                    continue;
+                }
                 var path = Path.build_filename  ("/usr/share/wayland-sessions/", session.concat(".desktop"), null);
                 if (FileUtils.test (path, FileTest.EXISTS)) {
                     debug ("Using %s as default (Wayland) session.", session);
@@ -266,6 +277,14 @@ public class ArcticaGreeter : Object
 
         if (!AGSettings.get_boolean (AGSettings.KEY_HIDE_X11_SESSIONS)) {
             foreach (string session in sessions) {
+                if (includeonly_sessions.length > 0) {
+                    if (!(session in includeonly_sessions)) {
+                        continue;
+                    }
+                }
+                else if (session in excluded_sessions) {
+                    continue;
+                }
                 var path = Path.build_filename  ("/usr/share/xsessions/", session.concat(".desktop"), null);
                 if (FileUtils.test (path, FileTest.EXISTS)) {
                     debug ("Using %s as default (X11) session.", session);
@@ -283,6 +302,18 @@ public class ArcticaGreeter : Object
         /* Make sure the given session actually exists. Return it if it does.
          * otherwise, return the default session.
          */
+        var excluded_sessions = AGSettings.get_strv (AGSettings.KEY_EXCLUDED_SESSIONS);
+        var includeonly_sessions = AGSettings.get_strv (AGSettings.KEY_INCLUDEONLY_SESSIONS);
+
+        if (includeonly_sessions.length > 0) {
+            if (!(session in includeonly_sessions)) {
+                session = null;
+            }
+        }
+        else if (session in excluded_sessions) {
+            session = null;
+        }
+
         if (session != null) {
             var xsessions_path = Path.build_filename  ("/usr/share/xsessions/", session.concat(".desktop"), null);
             var wsessions_path = Path.build_filename  ("/usr/share/wayland-sessions/", session.concat(".desktop"), null);
diff --git a/src/settings.vala b/src/settings.vala
index acef828..7c4bd84 100644
--- a/src/settings.vala
+++ b/src/settings.vala
@@ -73,6 +73,8 @@ public class AGSettings : Object
     public const string KEY_MENUBAR_ALPHA = "menubar-alpha";
     public const string KEY_HIDE_X11_SESSIONS = "hide-x11-sessions";
     public const string KEY_HIDE_WAYLAND_SESSIONS = "hide-wayland-sessions";
+    public const string KEY_INCLUDEONLY_SESSIONS = "includeonly-sessions";
+    public const string KEY_EXCLUDED_SESSIONS = "excluded-sessions";
     public const string KEY_SHUTDOWN_DIALOG_TIMEOUT = "shutdown-dialog-timeout";
     public const string KEY_PREFERRED_SESSIONS = "preferred-sessions";
 
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