Démarrage des applications en mode daemon

Les applications sont désormais lancées en mode "détachées".
Une limite "dure" de 2 secondes est appliquées pour l'animation de lancement sur les tuiles.

Fixes #5

src/util/system.js

@@ -98,15 +98,64 @@ exports.runApp = function(execPath, opts) {
 
   opts = opts || {};
 
-  if(opts.clearFreeDesktopFlags) {
-    execPath = exports.clearFreeDesktopFlags(execPath);
-  }
-
   return new Promise(function(resolve, reject) {
-    cp.exec(execPath, function(err) {
-      if(err) return reject(err);
-      return resolve();
+    try {
+
+      if(opts.clearFreeDesktopFlags) {
+        execPath = exports.clearFreeDesktopFlags(execPath);
+      }
+
+      var isDev = process.env.NODE_ENV === 'development';
+
+      var child = cp.spawn(execPath, {
+        detached: true,
+        shell: true,
+        stdio: [
+          'ignore',
+          isDev ? process.stdout : 'ignore',
+          isDev ? process.stderr : 'ignore'
+        ]
+      });
+
+      // Detach the child process
+      child.unref();
+
+    } catch(err) {
+      return reject(err);
+    }
+
+    // Execute the rest after all I/O operations in this tick
+    let immediateId = setImmediate(() => {
+
+      // We do not want to be notified of child events after launch
+      child.removeAllListeners();
+
+      try {
+        // Check if the child process is still alive, should throw otherwise
+        child.kill(0);
+      } catch(err) {
+        return reject(err);
+      }
+
+      return resolve(child);
+
     });
+
+    // If the child process exit with an exit code != 0, reject the promise
+    child.once('close', code => {
+      if(code === 0) return;
+      clearImmediate(immediateId);
+      child.removeAllListeners();
+      return reject(`Program exited with a exit code "${code}"`);
+    });
+
+    // If an error occurs during the process launch, reject the promise
+    child.once('error', err => {
+      clearImmediate(immediateId);
+      child.removeAllListeners();
+      return reject(err);
+    });
+
   });
 };