mutter/debian/patches/ubuntu/main-Support-loading-multiple-Yaru-theme-variants.patch

From: =?utf-8?b?Ik1hcmNvIFRyZXZpc2FuIChUcmV2acOxbyki?= <mail@3v1n0.net>
Date: Fri, 25 Feb 2022 01:07:12 +0100
Subject: main: Support loading multiple Yaru theme variants

Yaru can provide multiple variants, we can support using more theme
variants in GNOME shell as it happens on Gtk apps.

So, make StSettings to compute the main theme and the chosen variant,
and we use those to pick the correct .css file.

We don't make difference between dark/light themes here, as we assume
that the shell theme will always be dark or light.

Forwarded: not-needed
---
 data/meson.build                           |   8 +-
 data/org.gnome.shell.ubuntu.gschema.xml.in |  17 ++++
 js/ui/main.js                              |  42 ++++++++++
 src/st/st-settings.c                       | 120 +++++++++++++++++++++++++++++
 4 files changed, 186 insertions(+), 1 deletion(-)
 create mode 100644 data/org.gnome.shell.ubuntu.gschema.xml.in

diff --git a/data/meson.build b/data/meson.build
index 07d6d4a..3274af2 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -97,6 +97,12 @@ schema = configure_file(
   configuration: schemaconf,
   install_dir: schemadir
 )
+schema_ubuntu = configure_file(
+  input: 'org.gnome.shell.ubuntu.gschema.xml.in',
+  output: 'org.gnome.shell.ubuntu.gschema.xml',
+  configuration: schemaconf,
+  install_dir: schemadir
+)
 schema_ubuntu_login = configure_file(
   input: 'com.ubuntu.login-screen.gschema.xml.in',
   output: 'com.ubuntu.login-screen.gschema.xml',
@@ -131,7 +137,7 @@ endif
 
 # for unit tests - gnome.compile_schemas() only looks in srcdir
 custom_target('compile-schemas',
-  input: [schema, schema_ubuntu_login],
+  input: [schema, schema_ubuntu, schema_ubuntu_login],
   output: 'gschemas.compiled',
   command: [find_program('glib-compile-schemas'), data_builddir],
   build_by_default: true)
diff --git a/data/org.gnome.shell.ubuntu.gschema.xml.in b/data/org.gnome.shell.ubuntu.gschema.xml.in
new file mode 100644
index 0000000..6f9cc62
--- /dev/null
+++ b/data/org.gnome.shell.ubuntu.gschema.xml.in
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<schemalist gettext-domain="@GETTEXT_PACKAGE@">
+  <enum id="org.gnome.shell.ubuntu.GDesktopColorScheme">
+    <value value="1" nick="default"/>
+    <value value="2" nick="prefer-dark"/>
+    <value value="3" nick="prefer-light"/>
+  </enum>
+  <schema id="org.gnome.shell.ubuntu" path="/org/gnome/shell/ubuntu/">
+    <key name="color-scheme" enum="org.gnome.shell.ubuntu.GDesktopColorScheme">
+      <default>'default'</default>
+      <summary>Color scheme</summary>
+      <description>
+        The preferred color scheme for the shell user interface. Valid values are “default”, “prefer-dark”, “prefer-light”.
+      </description>
+    </key>
+  </schema>
+</schemalist>
diff --git a/js/ui/main.js b/js/ui/main.js
index b39bcf4..0d786b1 100644
--- a/js/ui/main.js
+++ b/js/ui/main.js
@@ -186,6 +186,9 @@ function start() {
     sessionMode.connect('updated', _sessionUpdated);
 
     St.Settings.get().connect('notify::high-contrast', _loadDefaultStylesheet);
+    St.Settings.get().connect('notify::gtk-theme', _loadDefaultStylesheet);
+    St.Settings.get().connect('notify::gtk-theme-variant', _loadDefaultStylesheet);
+    St.Settings.get().connect('notify::shell-color-scheme', _loadDefaultStylesheet);
 
     // Initialize ParentalControlsManager before the UI
     ParentalControlsManager.getDefault();
@@ -434,6 +437,38 @@ function _getStylesheet(name) {
     return null;
 }
 
+function _getYaruStyleSheet(themeVariant) {
+    const { shellColorScheme: colorScheme } = St.Settings.get();
+    const baseThemeName = sessionMode.stylesheetName.split(".css").at(0);
+    const isDark = themeVariant === 'dark' || themeVariant?.endsWith('-dark');
+    let colorSchemeVariant;
+
+    if (isDark && colorScheme == 'prefer-light') {
+        colorSchemeVariant = themeVariant.split('-').slice(0, -1).join('-');
+    } else if (!isDark && colorScheme == 'prefer-dark' ) {
+        colorSchemeVariant = themeVariant ? `${themeVariant}-dark` : 'dark';
+    }
+
+    if (colorSchemeVariant !== undefined) {
+        if (colorSchemeVariant.length)
+            colorSchemeVariant = `-${colorSchemeVariant}`;
+        const stylesheet = _getStylesheet(`${baseThemeName}${colorSchemeVariant}.css`);
+        if (stylesheet)
+            return stylesheet;
+    }
+
+    if (!themeVariant)
+        return null;
+
+    const stylesheet = _getStylesheet(`${baseThemeName}-${themeVariant}.css`);
+
+    // Try to use the dark theme if a dark variant is selected
+    if (!stylesheet && isDark)
+        return _getStylesheet(`${baseThemeName}-dark.css`);
+
+    return stylesheet;
+}
+
 function _getDefaultStylesheet() {
     let stylesheet = null;
     let name = sessionMode.stylesheetName;
@@ -442,6 +477,13 @@ function _getDefaultStylesheet() {
     if (St.Settings.get().high_contrast)
         stylesheet = _getStylesheet(name.replace('.css', '-high-contrast.css'));
 
+    if (stylesheet == null) {
+        const settings = St.Settings.get();
+
+        if (settings.gtkTheme === 'Yaru')
+            stylesheet = _getYaruStyleSheet(settings.gtkThemeVariant?.toLowerCase());
+    }
+
     if (stylesheet == null)
         stylesheet = _getStylesheet(sessionMode.stylesheetName);
 
diff --git a/src/st/st-settings.c b/src/st/st-settings.c
index 04bf68f..cb625b2 100644
--- a/src/st/st-settings.c
+++ b/src/st/st-settings.c
@@ -33,6 +33,8 @@
 #define KEY_FONT_NAME             "font-name"
 #define KEY_HIGH_CONTRAST         "high-contrast"
 #define KEY_GTK_ICON_THEME        "icon-theme"
+#define KEY_GTK_THEME             "gtk-theme"
+#define KEY_COLOR_SCHEME          "color-scheme"
 #define KEY_MAGNIFIER_ACTIVE      "screen-magnifier-enabled"
 #define KEY_DISABLE_SHOW_PASSWORD "disable-show-password"
 
@@ -43,7 +45,10 @@ enum {
   PROP_DRAG_THRESHOLD,
   PROP_FONT_NAME,
   PROP_HIGH_CONTRAST,
+  PROP_GTK_THEME,
+  PROP_GTK_THEME_VARIANT,
   PROP_GTK_ICON_THEME,
+  PROP_SHELL_COLOR_SCHEME,
   PROP_MAGNIFIER_ACTIVE,
   PROP_SLOW_DOWN_FACTOR,
   PROP_DISABLE_SHOW_PASSWORD,
@@ -60,10 +65,13 @@ struct _StSettings
   GSettings *a11y_applications_settings;
   GSettings *a11y_interface_settings;
   GSettings *lockdown_settings;
+  GSettings *ubuntu_settings;
 
   gchar *font_name;
   gboolean high_contrast;
   gchar *gtk_icon_theme;
+  gchar *gtk_theme;
+  gchar *gtk_theme_variant;
   int inhibit_animations_count;
   gboolean enable_animations;
   gboolean primary_paste;
@@ -133,7 +141,10 @@ st_settings_finalize (GObject *object)
   g_object_unref (settings->a11y_applications_settings);
   g_object_unref (settings->a11y_interface_settings);
   g_object_unref (settings->lockdown_settings);
+  g_object_unref (settings->ubuntu_settings);
   g_free (settings->font_name);
+  g_free (settings->gtk_theme);
+  g_free (settings->gtk_theme_variant);
   g_free (settings->gtk_icon_theme);
 
   G_OBJECT_CLASS (st_settings_parent_class)->finalize (object);
@@ -185,6 +196,16 @@ st_settings_get_property (GObject    *object,
     case PROP_GTK_ICON_THEME:
       g_value_set_string (value, settings->gtk_icon_theme);
       break;
+    case PROP_GTK_THEME:
+      g_value_set_string (value, settings->gtk_theme);
+      break;
+    case PROP_GTK_THEME_VARIANT:
+      g_value_set_string (value, settings->gtk_theme_variant);
+      break;
+    case PROP_SHELL_COLOR_SCHEME:
+      g_value_take_string (value,
+        g_settings_get_string (settings->ubuntu_settings, KEY_COLOR_SCHEME));
+      break;
     case PROP_MAGNIFIER_ACTIVE:
       g_value_set_boolean (value, settings->magnifier_active);
       break;
@@ -275,6 +296,39 @@ st_settings_class_init (StSettingsClass *klass)
                                                     "",
                                                     ST_PARAM_READABLE);
 
+  /**
+   * StSettings:gtk-theme:
+   *
+   * The current GTK theme
+   */
+  props[PROP_GTK_THEME] = g_param_spec_string ("gtk-theme",
+                                               "GTK Theme",
+                                               "GTK Theme",
+                                               "",
+                                               ST_PARAM_READABLE);
+
+  /**
+   * StSettings:gtk-theme-variant:
+   *
+   * The current GTK theme
+   */
+  props[PROP_GTK_THEME_VARIANT] = g_param_spec_string ("gtk-theme-variant",
+                                                       "GTK Theme Variant",
+                                                       "GTK Theme Variant",
+                                                       "",
+                                                       ST_PARAM_READABLE);
+
+  /**
+   * StSettings:shell-color-scheme:
+   *
+   * The current GTK theme
+   */
+  props[PROP_SHELL_COLOR_SCHEME] = g_param_spec_string ("shell-color-scheme",
+                                                        "Shell Color Scheme",
+                                                        "Shell Color Scheme",
+                                                        "default",
+                                                        ST_PARAM_READABLE);
+
   /**
    * StSettings:magnifier-active:
    *
@@ -311,6 +365,45 @@ st_settings_class_init (StSettingsClass *klass)
   g_object_class_install_properties (object_class, N_PROPS, props);
 }
 
+static void
+update_theme_settings (StSettings *settings)
+{
+  g_auto(GStrv) parts = NULL;
+  g_autofree char *theme = NULL;
+  g_autofree char *variant = NULL;
+
+  theme = g_settings_get_string (settings->interface_settings, KEY_GTK_THEME);
+  parts = g_strsplit (theme, "-", 2);
+
+  switch (g_strv_length (parts))
+    {
+    case 2:
+      variant = g_strdup (parts[1]);
+      /* fallthrough */
+    case 1:
+      theme = g_strdup (parts[0]);
+      break;
+    }
+
+  if (g_strcmp0 (settings->gtk_theme, theme) != 0)
+    {
+      g_free (settings->gtk_theme);
+      settings->gtk_theme = g_steal_pointer (&theme);
+
+      g_object_notify_by_pspec (G_OBJECT (settings),
+                                props[PROP_GTK_THEME]);
+    }
+
+  if (g_strcmp0 (settings->gtk_theme_variant, variant) != 0)
+    {
+      g_free (settings->gtk_theme_variant);
+      settings->gtk_theme_variant = g_steal_pointer (&variant);
+
+      g_object_notify_by_pspec (G_OBJECT (settings),
+                                props[PROP_GTK_THEME_VARIANT]);
+    }
+}
+
 static void
 on_interface_settings_changed (GSettings   *g_settings,
                                const gchar *key,
@@ -332,6 +425,10 @@ on_interface_settings_changed (GSettings   *g_settings,
       settings->font_name = g_settings_get_string (g_settings, key);
       g_object_notify_by_pspec (G_OBJECT (settings), props[PROP_FONT_NAME]);
     }
+  else if (g_str_equal (key, KEY_GTK_THEME))
+    {
+      update_theme_settings (settings);
+    }
   else if (g_str_equal (key, KEY_GTK_ICON_THEME))
     {
       g_free (settings->gtk_icon_theme);
@@ -339,6 +436,23 @@ on_interface_settings_changed (GSettings   *g_settings,
       g_object_notify_by_pspec (G_OBJECT (settings),
                                 props[PROP_GTK_ICON_THEME]);
     }
+  else if (g_str_equal (key, KEY_COLOR_SCHEME))
+    {
+      g_object_notify_by_pspec (G_OBJECT (settings),
+                                props[PROP_SHELL_COLOR_SCHEME]);
+    }
+}
+
+static void
+on_ubuntu_settings_changed (GSettings   *g_settings,
+                            const gchar *key,
+                            StSettings  *settings)
+{
+  if (g_str_equal (key, KEY_COLOR_SCHEME))
+    {
+      g_object_notify_by_pspec (G_OBJECT (settings),
+                                props[PROP_SHELL_COLOR_SCHEME]);
+    }
 }
 
 static void
@@ -398,6 +512,10 @@ st_settings_init (StSettings *settings)
   g_signal_connect (settings->interface_settings, "changed",
                     G_CALLBACK (on_interface_settings_changed), settings);
 
+  settings->ubuntu_settings = g_settings_new ("org.gnome.shell.ubuntu");
+  g_signal_connect (settings->ubuntu_settings, "changed",
+                    G_CALLBACK (on_ubuntu_settings_changed), settings);
+
   settings->mouse_settings = g_settings_new ("org.gnome.desktop.peripherals.mouse");
   g_signal_connect (settings->mouse_settings, "changed",
                     G_CALLBACK (on_mouse_settings_changed), settings);
@@ -414,6 +532,8 @@ st_settings_init (StSettings *settings)
   g_signal_connect (settings->lockdown_settings, "changed",
                     G_CALLBACK (on_lockdown_settings_changed), settings);
 
+  update_theme_settings (settings);
+
   settings->enable_animations = g_settings_get_boolean (settings->interface_settings,
                                                         KEY_ENABLE_ANIMATIONS);
   settings->primary_paste = g_settings_get_boolean (settings->interface_settings,