Add default application selector for browsers, email, and file managers

src/core/integrator.rs

@@ -332,6 +332,28 @@ pub fn undo_all_modifications(db: &Database, appimage_id: i64) -> Result<(), Str
                         .status();
                 }
             }
+            "default_app" => {
+                if let Some(ref prev) = m.previous_value {
+                    match m.file_path.as_str() {
+                        "web-browser" => {
+                            let _ = Command::new("xdg-settings")
+                                .args(["set", "default-web-browser", prev])
+                                .status();
+                        }
+                        "email-client" => {
+                            let _ = Command::new("xdg-settings")
+                                .args(["set", "default-url-scheme-handler", "mailto", prev])
+                                .status();
+                        }
+                        "file-manager" => {
+                            let _ = Command::new("xdg-mime")
+                                .args(["default", prev, "inode/directory"])
+                                .status();
+                        }
+                        _ => {}
+                    }
+                }
+            }
             "system_desktop" | "system_icon" | "system_binary" => {
                 let _ = Command::new("pkexec")
                     .args(["rm", "-f", &m.file_path])
@@ -395,6 +417,124 @@ pub fn set_mime_default(
     Ok(())
 }
 
+/// A system-level default application type that an AppImage can serve as.
+#[derive(Debug, Clone, PartialEq)]
+pub enum DefaultAppType {
+    WebBrowser,
+    EmailClient,
+    FileManager,
+}
+
+impl DefaultAppType {
+    pub fn label(&self) -> &'static str {
+        match self {
+            Self::WebBrowser => "Web browser",
+            Self::EmailClient => "Email client",
+            Self::FileManager => "File manager",
+        }
+    }
+}
+
+/// Detect which system-default roles an AppImage can fill based on its categories.
+pub fn detect_default_capabilities(categories: &str) -> Vec<DefaultAppType> {
+    let mut caps = Vec::new();
+    if categories.contains("WebBrowser") {
+        caps.push(DefaultAppType::WebBrowser);
+    }
+    if categories.contains("Email") {
+        caps.push(DefaultAppType::EmailClient);
+    }
+    if categories.contains("FileManager") {
+        caps.push(DefaultAppType::FileManager);
+    }
+    caps
+}
+
+/// Set an AppImage as a system-default application for the given role.
+/// Stores the previous default in system_modifications for reversal.
+pub fn set_default_app(
+    db: &Database,
+    appimage_id: i64,
+    app_id: &str,
+    cap: &DefaultAppType,
+) -> Result<(), String> {
+    let desktop_filename = format!("driftwood-{}.desktop", app_id);
+
+    match cap {
+        DefaultAppType::WebBrowser => {
+            let prev = Command::new("xdg-settings")
+                .args(["get", "default-web-browser"])
+                .output()
+                .ok()
+                .and_then(|o| {
+                    if o.status.success() {
+                        let s = String::from_utf8_lossy(&o.stdout).trim().to_string();
+                        if s.is_empty() { None } else { Some(s) }
+                    } else {
+                        None
+                    }
+                });
+
+            let status = Command::new("xdg-settings")
+                .args(["set", "default-web-browser", &desktop_filename])
+                .status()
+                .map_err(|e| format!("xdg-settings failed: {}", e))?;
+            if !status.success() {
+                return Err("xdg-settings returned non-zero".to_string());
+            }
+            db.register_modification(appimage_id, "default_app", "web-browser", prev.as_deref()).ok();
+        }
+        DefaultAppType::EmailClient => {
+            let prev = Command::new("xdg-settings")
+                .args(["get", "default-url-scheme-handler", "mailto"])
+                .output()
+                .ok()
+                .and_then(|o| {
+                    if o.status.success() {
+                        let s = String::from_utf8_lossy(&o.stdout).trim().to_string();
+                        if s.is_empty() { None } else { Some(s) }
+                    } else {
+                        None
+                    }
+                });
+
+            let status = Command::new("xdg-settings")
+                .args(["set", "default-url-scheme-handler", "mailto", &desktop_filename])
+                .status()
+                .map_err(|e| format!("xdg-settings failed: {}", e))?;
+            if !status.success() {
+                return Err("xdg-settings returned non-zero".to_string());
+            }
+            db.register_modification(appimage_id, "default_app", "email-client", prev.as_deref()).ok();
+        }
+        DefaultAppType::FileManager => {
+            let prev = Command::new("xdg-mime")
+                .args(["query", "default", "inode/directory"])
+                .output()
+                .ok()
+                .and_then(|o| {
+                    if o.status.success() {
+                        let s = String::from_utf8_lossy(&o.stdout).trim().to_string();
+                        if s.is_empty() { None } else { Some(s) }
+                    } else {
+                        None
+                    }
+                });
+
+            let status = Command::new("xdg-mime")
+                .args(["default", &desktop_filename, "inode/directory"])
+                .status()
+                .map_err(|e| format!("xdg-mime failed: {}", e))?;
+            if !status.success() {
+                return Err("xdg-mime returned non-zero".to_string());
+            }
+            db.register_modification(appimage_id, "default_app", "file-manager", prev.as_deref()).ok();
+        }
+    }
+
+    Ok(())
+}
+
 fn update_desktop_database() {
     let apps_dir = applications_dir();
     Command::new("update-desktop-database")

src/ui/detail_view.rs

@@ -1123,6 +1123,62 @@ fn build_system_tab(record: &AppImageRecord, db: &Rc<Database>, toast_overlay: &
         }
     }
 
+    // Default Application group
+    if let Some(ref cats) = record.categories {
+        let caps = integrator::detect_default_capabilities(cats);
+        if !caps.is_empty() && record.integrated {
+            let default_group = adw::PreferencesGroup::builder()
+                .title("Default Application")
+                .description(
+                    "Set this app as your system default for tasks it can handle."
+                )
+                .build();
+
+            let app_id = integrator::make_app_id(
+                record.app_name.as_deref().unwrap_or(&record.filename),
+            );
+
+            for cap in &caps {
+                let row = adw::ActionRow::builder()
+                    .title(cap.label())
+                    .build();
+
+                let set_btn = gtk::Button::builder()
+                    .label("Set Default")
+                    .valign(gtk::Align::Center)
+                    .build();
+                set_btn.add_css_class("flat");
+
+                let db_def = db.clone();
+                let record_id = record.id;
+                let app_id_clone = app_id.clone();
+                let cap_clone = cap.clone();
+                let toast_def = toast_overlay.clone();
+                set_btn.connect_clicked(move |btn| {
+                    match integrator::set_default_app(
+                        &db_def, record_id, &app_id_clone, &cap_clone,
+                    ) {
+                        Ok(()) => {
+                            toast_def.add_toast(adw::Toast::new(
+                                &format!("Set as default {}", cap_clone.label().to_lowercase()),
+                            ));
+                            btn.set_sensitive(false);
+                            btn.set_label("Default");
+                        }
+                        Err(e) => {
+                            log::error!("Failed to set default app: {}", e);
+                            toast_def.add_toast(adw::Toast::new("Failed to set default"));
+                        }
+                    }
+                });
+
+                row.add_suffix(&set_btn);
+                default_group.add(&row);
+            }
+            inner.append(&default_group);
+        }
+    }
+
     // Runtime Compatibility group
     let compat_group = adw::PreferencesGroup::builder()
         .title("Compatibility")