add clear sql log button

classes/pref/system.php

@@ -19,6 +19,10 @@ class Pref_System extends Handler_Protected {
 		return array_search($method, $csrf_ignored) !== false;
 	}
 
+	function clearLog() {
+		$this->dbh->query("DELETE FROM ttrss_error_log");
+	}
+
 	function index() {
 
 		print "<div dojoType=\"dijit.layout.AccordionContainer\" region=\"center\">";
@@ -35,6 +39,9 @@ class Pref_System extends Handler_Protected {
 			print "<button dojoType=\"dijit.form.Button\"
 				onclick=\"updateSystemList()\">".__('Refresh')."</button> ";
 
+			print "&nbsp;<button dojoType=\"dijit.form.Button\"
+				onclick=\"clearSqlLog()\">".__('Clear log')."</button> ";
+
 			print "<p><table width=\"100%\" cellspacing=\"10\" class=\"prefErrorLog\">";
 
 			print "<tr class=\"title\">

js/prefs.js

@@ -1833,3 +1833,21 @@ function clearPluginData(name) {
 		exception_error("clearPluginData", e);
 	}
 }
+
+function clearSqlLog() {
+
+	if (confirm(__("Clear all messages in the error log?"))) {
+
+		notify_progress("Loading, please wait...");
+		var query = "?op=pref-system&method=clearLog";
+
+		new Ajax.Request("backend.php",	{
+			parameters: query,
+			onComplete: function(transport) {
+				updateSystemList();
+			} });
+
+	}
+}
+
+