add collapsible SNI system tray, rename project to i3bar-mango

Tray: the bar acts as org.kde.StatusNotifierWatcher plus host (zbus),
rendering items on the right edge with icon/name; [tray] config toggles
expanded, show_icon, show_name, show_description. Clicks map to
Activate/SecondaryActivate/ContextMenu.

Rename: package, binary, config dir, layer-shell namespace and DBus
names are now i3bar-mango; mango is the default feature and the first
WM provider tried.

1 files changed, 28 insertions, 0 deletions

diff --git a/src/icon.rs b/src/icon.rs
index 4dae1a9..1173629 100644
--- a/src/icon.rs
+++ b/src/icon.rs
@@ -17,6 +17,34 @@ impl IconCache {
             .or_insert_with(|| resolve_icon(app_id, bar_height))
             .as_ref()
     }
+
+    /// Get a tray icon by name, preferring the given SNI IconThemePath.
+    pub fn get_tray_icon(
+        &mut self,
+        name: &str,
+        theme_path: &str,
+        bar_height: u32,
+    ) -> Option<&cairo::ImageSurface> {
+        if name.is_empty() {
+            return None;
+        }
+        self.map
+            .entry(format!("{theme_path}:{name}"))
+            .or_insert_with(|| resolve_tray_icon(name, theme_path, bar_height))
+            .as_ref()
+    }
+}
+
+fn resolve_tray_icon(name: &str, theme_path: &str, bar_height: u32) -> Option<cairo::ImageSurface> {
+    if !theme_path.is_empty() {
+        let path = PathBuf::from(theme_path).join(format!("{name}.png"));
+        if let Ok(mut file) = std::fs::File::open(path)
+            && let Ok(surface) = cairo::ImageSurface::create_from_png(&mut file)
+        {
+            return Some(surface);
+        }
+    }
+    resolve_icon(name, bar_height)
 }
 
 fn resolve_icon(app_id: &str, bar_height: u32) -> Option<cairo::ImageSurface> {