init

.gitignore

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+build/

data/finder.appdata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2019 Your Name <you@email.com> -->
+<component type="desktop">
+  <id>de.inhji.finder</id>
+  <metadata_license>CC0</metadata_license>
+  <name>Finder</name>
+  <summary>Find everything, do everything!</summary>
+  <description>
+    <p>A quick summary of your app's main selling points and features. Just a couple sentences per paragraph is best.</p>
+  </description>
+</component>

data/finder.desktop

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+[Desktop Entry]
+Name=Finder
+GenericName=Finder App
+Comment=Proves that we can use Vala and Gtk
+Categories=Utility;Education;
+Exec=de.inhji.finder
+Icon=application-default-icon
+Terminal=false
+Type=Application
+Keywords=Hello;World;Example;

meson.build

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+# project name and programming language
+project('de.inhji.finder', 'vala', 'c')
+
+# Create a new executable, list the files we want to compile, list the dependencies we need, and install
+executable(
+    meson.project_name(),
+    'src/Application.vala',
+    dependencies: [
+        dependency('gtk+-3.0')
+    ],
+    install: true
+)
+
+# Install our .desktop file so the Applications Menu will see it
+install_data(
+    join_paths('data', 'finder.desktop'),
+    install_dir: join_paths(get_option('datadir'), 'applications'),
+    rename: meson.project_name() + '.desktop'
+)
+
+# Install our .appdata.xml file so AppCenter will see it
+install_data(
+    join_paths('data', 'finder.appdata.xml'),
+    install_dir: join_paths(get_option('datadir'), 'metainfo'),
+    rename: meson.project_name() + '.appdata.xml'
+)

src/Application.vala

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+using Gtk;
+
+namespace Vala {
+	class FinderApp : Gtk.Application {
+		public FinderApp() {
+			Object (
+				application_id: "de.inhji.finder",
+				flags: ApplicationFlags.FLAGS_NONE
+			);
+		}
+
+		protected override void activate() {
+			var main_window = new Gtk.ApplicationWindow(this) {
+				default_height = 300,
+				default_width = 300,
+				title = "Finder!"
+			};
+
+			var label = new Gtk.Label("Hello Again World!");
+
+			main_window.add(label);
+			main_window.show_all();
+		}
+
+		public static int main(string[] args) {
+			return new FinderApp().run(args);
+		}
+	}
+}