Allow other applications to open text files with Odysseus.

And while I was trying to make that work, I corrected some problems in
the .desktop file.
Specifically I wrote down the wrong executable name and
the categories I selected for it didn't validate.
So I focused it on the publishing category.

16min

data/write-as-gtk.desktop

@@ -2,10 +2,11 @@
 Type=Application
 Name=write.as
 Comment=Spread your ideas
-Exec=write.as-gtk
+Exec=write-as-gtk %f
 Icon=write-as
 Terminal=false
-Categories=Network;GTK;Development;Office;Utility;Publishing;TextTools;TextEditor;
+MimeType=text/plain;
+Categories=GTK;Office;Publishing;
 Keywords=blog;pastebin;snippets;code;publish;
 StartupNotify=true
 

src/application.vala

@@ -1,5 +1,6 @@
 public class WriteAs.Application : Gtk.Application {
     construct {
+        this.flags |= ApplicationFlags.HANDLES_OPEN;
         Intl.setlocale(LocaleCategory.ALL, "");
         Intl.textdomain("write.as");
 
@@ -11,6 +12,15 @@ public class WriteAs.Application : Gtk.Application {
             new WriteAs.MainWindow(this).show_all();
     }
 
+    public override void open(File[] files, string hint) {
+        activate(); // ensure we have a window open.
+        try {
+            (get_windows().data as MainWindow).open_file(files[0]);
+        } catch (Error e) {
+            error(e.message);
+        }
+    }
+
     public static int main(string[] args) {
         return new WriteAs.Application().run(args);
     }

src/window.vala

@@ -120,10 +120,7 @@ public class WriteAs.MainWindow : Gtk.ApplicationWindow {
         accels.connect(Gdk.Key.O, Gdk.ModifierType.CONTROL_MASK,
                 Gtk.AccelFlags.VISIBLE | Gtk.AccelFlags.LOCKED, (g, a, k, m) => {
             try {
-                uint8[] text;
-                var file = prompt_file(Gtk.FileChooserAction.OPEN, _("_Open"));
-                file.load_contents(null, out text, null);
-                canvas.buffer.text = (string) text;
+                open_file(prompt_file(Gtk.FileChooserAction.OPEN, _("_Open")));
             } catch (Error e) {
                 // It's fine...
             }
@@ -161,6 +158,12 @@ public class WriteAs.MainWindow : Gtk.ApplicationWindow {
         if (resp == Gtk.ResponseType.ACCEPT) return file_chooser.get_file();
         else throw new UserCancellable.USER_CANCELLED("FileChooserDialog");
     }
+
+    public void open_file(File file) throws Error {
+        uint8[] text;
+        file.load_contents(null, out text, null);
+        canvas.buffer.text = (string) text;
+    }
 }
 
 errordomain WriteAs.UserCancellable {USER_CANCELLED}