about: display GStreamer version

TODO.md

@@ -93,6 +93,7 @@
 ### GStreamer:
 
 - [ ] Implement pipeline unit test
+- [x] Display GStreamer version in the about dialog
 
 ### app
 

src/gps/player.rs

@@ -82,6 +82,10 @@ impl Player {
         Ok(pipeline)
     }
 
+    pub fn get_version() -> String {
+        gst::version_string().to_string()
+    }
+
     pub fn set_app(&self, app: GPSAppWeak) {
         *self.app.borrow_mut() = Some(app.upgrade().unwrap());
     }

src/ui/about.rs

@@ -8,6 +8,7 @@
 
 use crate::app::GPSApp;
 use crate::config;
+use crate::gps as GPS;
 use gettextrs::gettext;
 use gtk::builders::AboutDialogBuilder;
 use gtk::prelude::*;
@@ -23,7 +24,11 @@ pub fn display_about_dialog(app: &GPSApp) {
         .modal(true)
         .program_name("GstPipelineStudio")
         .version(config::VERSION)
-        .comments(&gettext("Draw your own GStreamer pipeline"))
+        .comments(&format!(
+            "{}\n\n{}",
+            &gettext("Draw your own GStreamer pipeline"),
+            GPS::Player::get_version()
+        ))
         .website("https://gitlab.freedesktop.org/dabrain34/GstPipelineStudio")
         .authors(vec!["Stéphane Cerveau".to_string()])
         .artists(vec!["Stéphane Cerveau".to_string()])