Some new help functions, some cleanup.

app/controllers/HelpController.php

@@ -0,0 +1,46 @@
+<?php
+
+class HelpController extends BaseController
+{
+    public function show($route)
+    {
+        // no valid route
+        if (!Route::has($route)) {
+            $helpText  = '<p>There is no help for this route!</p>';
+            $helpTitle = 'Help';
+
+            return Response::json(['title' => $helpTitle, 'text' => $helpText]);
+        }
+
+        // content in cache
+        if (Cache::has('help.' . $route . '.title') && Cache::has('help.' . $route . '.text')) {
+            $helpText  = Cache::get('help.' . $route . '.text');
+            $helpTitle = Cache::get('help.' . $route . '.title');
+
+            return Response::json(['title' => $helpTitle, 'text' => $helpText]);
+        }
+
+        // get the help-content from Github:
+        $URL = 'https://raw.githubusercontent.com/JC5/firefly-iii-help/master/' . e($route) . '.md';
+        try {
+            $content = file_get_contents($URL);
+        } catch (ErrorException $e) {
+            $content = '<p>There is no help for this route.</p>';
+        }
+        if (strlen($content) > 0) {
+            $helpText  = \Michelf\Markdown::defaultTransform($content);
+            $helpTitle = $route;
+
+            Cache::put('help.' . $route . '.text', $helpText, 10080); // a week.
+            Cache::put('help.' . $route . '.title', $helpTitle, 10080);
+
+            return Response::json(['title' => $helpTitle, 'text' => $helpText]);
+        }
+
+        $helpText  = '<p>There is no help for this route!</p>';
+        $helpTitle = 'Help';
+
+        return Response::json(['title' => $helpTitle, 'text' => $helpText]);
+
+    }
+}