feature: add support for COSMIC Epoch

Author: netraptor

CHANGELOG.md

@@ -1,5 +1,6 @@
 # Next
 
+- **[Feature]** Detect COSMIC Epoch. ([@netraptor](https://github.com/netraptor), [#13](https://github.com/demurgos/detect-desktop-environment/pull/13))
 - **[Fix]** Fix spelling when matching `GNOME-Classic`. ([@bash](https://github.com/bash), [#11](https://github.com/demurgos/detect-desktop-environment/pull/11))
 - **[Fix]** Remove thumbnails from Cargo package, for faster downloads. ([@bbb651](https://github.com/bbb651), [#12](https://github.com/demurgos/detect-desktop-environment/pull/12))
 

README.md

@@ -40,6 +40,7 @@ section.
 |-----------------|--------------------------------------------------|
 | `Cinnamon`      | ![Cinnamon](./thumbnails/cinnamon.png)           |
 | `Cosmic`        | ![COSMIC](./thumbnails/cosmic.png)               |
+| `Cosmic Epoch`  | ![COSMIC Epoch](./thumbnails/cosmic-epoch.png)   |
 | `Dde`           | ![Deepin DE](./thumbnails/dde.png)               |
 | `Ede`           | ![EDE](./thumbnails/ede.png)                     |
 | `Endless`       | ![Endless](./thumbnails/endless.png)             |

src/lib.rs

@@ -25,14 +25,21 @@ pub enum DesktopEnvironment {
   ///
   /// - <https://en.wikipedia.org/wiki/Cinnamon_(desktop_environment)>
   Cinnamon,
-  /// COSMIC, the default desktop environment for Linux Pop!_OS.
+  /// COSMIC, the legacy GNOME-based desktop environment for Linux Pop!_OS.
   ///
-  /// Note: This corresponds to the classic COSMIC based on GNOME, not the Rust
-  /// [COSMIC-epoch](https://github.com/pop-os/cosmic-epoch). Please send a PR if you can
-  /// test how to detect cosmic-epoch.
+  /// Note: This corresponds to the classic COSMIC based on GNOME. For the new
+  /// [COSMIC Epoch](https://github.com/pop-os/cosmic-epoch) desktop
+  /// environment built in Rust, use [`DesktopEnvironment::CosmicEpoch`].
   ///
   /// - <https://github.com/pop-os/cosmic>
   Cosmic,
+  /// COSMIC Epoch
+  ///
+  /// Note: This corresponds to the new COSMIC desktop environment
+  /// built by System76 in Rust for Linux Pop!_OS.
+  ///
+  /// - <https://github.com/pop-os/cosmic-epoch>
+  CosmicEpoch,
   /// Deepin desktop environment
   ///
   /// - <https://www.deepin.org/index/en>
@@ -206,6 +213,7 @@ impl DesktopEnvironment {
   pub fn from_freedesktop(name: &str) -> Option<Self> {
     // the patterns in the match below are ordered to match the order in the freedesktop table
     match name {
+      "COSMIC" => Some(DesktopEnvironment::CosmicEpoch),
       "GNOME" => Some(DesktopEnvironment::Gnome),
       "GNOME-Classic" => Some(DesktopEnvironment::Gnome),
       "GNOME-Flashback" => Some(DesktopEnvironment::Gnome),
@@ -368,6 +376,10 @@ mod tests {
       DesktopEnvironment::from_xdg_current_desktop("Hyprland"),
       Some(DesktopEnvironment::Hyprland)
     );
+    assert_eq!(
+      DesktopEnvironment::from_xdg_current_desktop("COSMIC"),
+      Some(DesktopEnvironment::CosmicEpoch)
+    );
 
     // Colon splitting
     assert_eq!(