WIP: app: allow to load recent open files

Keep a list of 4 files and be able to load it
again

TODO.md

@@ -112,6 +112,7 @@
 - [ ] reopen the last log on prematured exit (crash)
 - [ ] Play/pause should be prevented until the pipeline is ready
 - [ ] Filter the elements by class/rank etc.
+- [ ] Add a list of recent open files to the burger menu
 
 ### CI/Infra
 

src/app.rs

@@ -483,6 +483,7 @@ impl GPSApp {
             GPSApp::get_file_from_dialog(&app, false, move |app, filename| {
                 app.load_graph(&filename)
                     .unwrap_or_else(|_| GPS_ERROR!("Unable to open file {}", filename));
+                Settings::add_recent_open_file(&filename);
             });
         });
 

src/settings.rs

@@ -17,6 +17,7 @@ use crate::config;
 use crate::logger;
 
 #[derive(Debug, Serialize, Deserialize, Default)]
+#[serde(default)]
 pub struct Settings {
     pub app_maximized: bool,
     pub app_width: i32,
@@ -24,6 +25,7 @@ pub struct Settings {
 
     // values must be emitted before tables
     pub favorites: Vec<String>,
+    pub recent_open_files: Vec<String>,
     pub paned_positions: HashMap<String, i32>,
     pub preferences: HashMap<String, String>,
 }
@@ -89,6 +91,24 @@ impl Settings {
         favorites
     }
 
+    pub fn add_recent_open_file(filename: &str) {
+        let mut settings = Settings::load_settings();
+        if settings.recent_open_files.len() >= 4 {
+            settings.recent_open_files.pop();
+        }
+        settings.recent_open_files.insert(0, String::from(filename));
+        Settings::save_settings(&settings);
+    }
+
+    pub fn get_recent_open_files() -> Vec<String> {
+        let mut recent_open_files = Vec::new();
+        let settings = Settings::load_settings();
+        for recent in settings.recent_open_files {
+            recent_open_files.push(recent);
+        }
+        recent_open_files
+    }
+
     // Save the provided settings to the settings path
     pub fn save_settings(settings: &Settings) {
         Settings::settings_file_exist();

src/ui/gps.ui

@@ -18,6 +18,10 @@
         <attribute name="action">app.save_as</attribute>
         <attribute name="accel">&lt;primary&gt;n</attribute>
       </item>
+      <submenu>
+        <attribute name="label" translatable="yes" comments="Primary menu entry that open recent files">_Open recent ...</attribute>
+        <attribute name="action">app.open_recent</attribute>
+      </submenu>
       <item>
         <attribute name="label" translatable="yes" comments="Primary menu entry that open the preferences">_Preferences</attribute>
         <attribute name="action">app.preferences</attribute>