improve admin git info card

www/commands/site_gitinfo.php

@@ -0,0 +1,23 @@
+<?php
+require_once (__DIR__ . '/../internals/website.php');
+
+/** @var PageFrameOptions $FRAME_OPTIONS */ global $FRAME_OPTIONS;
+/** @var URLRoute $ROUTE */ global $ROUTE;
+/** @var Website $SITE */ global $SITE;
+
+
+if (!isset($API_OPTIONS['field'])) { $FRAME_OPTIONS->forceResult(400, "Wrong parameters."); return; }
+
+$field = strtolower($API_OPTIONS['field']);
+
+if ($field === 'branch')    { echo exec('git rev-parse --abbrev-ref HEAD'); return; }
+if ($field === 'head')      { echo exec('git rev-parse HEAD'); return; }
+if ($field === 'timestamp') { echo (new DateTime(exec('git log -1 --format=%cd --date=iso')))->format('Y-m-d H:i:s'); return; }
+if ($field === 'origin')    { echo exec('git config --get remote.origin.url'); return; }
+if ($field === 'message')   { echo trim(shell_exec('git log -1 --format=%B')); return; }
+
+
+$FRAME_OPTIONS->statuscode = 400;
+echo 'Unknown field';
+
+return;