Separate background config options into a section

**Breaking changes**:
- The `background` option is now `background.path`
- The `background_fit` option is now `background.fit`

regreet.sample.toml

@@ -2,14 +2,15 @@
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+[background]
 # Path to the background image
-background = "/usr/share/backgrounds/greeter.jpg"
+path = "/usr/share/backgrounds/greeter.jpg"
 
 # How the background image covers the screen if the aspect ratio doesn't match
 # Available values: "Fill", "Contain", "Cover", "ScaleDown"
 # Refer to: https://docs.gtk.org/gtk4/enum.ContentFit.html
 # NOTE: This is ignored if ReGreet isn't compiled with GTK v4.8 support.
-background_fit = "Contain"
+fit = "Contain"
 
 # The entries defined in this section will be passed to the session as environment variables when it is started
 [env]

src/config.rs

@@ -37,6 +37,15 @@ pub enum BgFit {
     ScaleDown,
 }
 
+/// Struct for info about the background image
+#[derive(Default, Deserialize, Serialize)]
+struct Background {
+    #[serde(default)]
+    path: Option<String>,
+    #[serde(default)]
+    fit: BgFit,
+}
+
 /// Struct for reboot/poweroff commands
 #[derive(Deserialize, Serialize)]
 pub struct SystemCommands {
@@ -69,9 +78,7 @@ pub struct Config {
     #[serde(default)]
     env: HashMap<String, String>,
     #[serde(default)]
-    background: Option<String>,
-    #[serde(default)]
-    pub background_fit: Option<BgFit>,
+    background: Background,
     #[serde(default, rename = "GTK")]
     gtk: Option<GtkSettings>,
     #[serde(default)]
@@ -88,12 +95,12 @@ impl Config {
     }
 
     pub fn get_background(&self) -> &Option<String> {
-        &self.background
+        &self.background.path
     }
 
     #[cfg(feature = "gtk4_8")]
-    pub fn get_background_fit(&self) -> &Option<BgFit> {
-        &self.background_fit
+    pub fn get_background_fit(&self) -> &BgFit {
+        &self.background.fit
     }
 
     pub fn get_gtk_settings(&self) -> &Option<GtkSettings> {

src/gui/component.rs

@@ -330,14 +330,15 @@ impl Component for Greeter {
 
         // cfg directives don't work inside Relm4 view! macro.
         #[cfg(feature = "gtk4_8")]
-        if let Some(fit) = model.config.get_background_fit() {
-            widgets.ui.background.set_content_fit(match fit {
+        widgets
+            .ui
+            .background
+            .set_content_fit(match model.config.get_background_fit() {
                 BgFit::Fill => gtk4::ContentFit::Fill,
                 BgFit::Contain => gtk4::ContentFit::Contain,
                 BgFit::Cover => gtk4::ContentFit::Cover,
                 BgFit::ScaleDown => gtk4::ContentFit::ScaleDown,
             });
-        };
 
         // Cancel any previous session, just in case someone started one.
         if let Err(err) = model.greetd_client.lock().unwrap().cancel_session() {