[GreaseMonkey] Fixed loading invalid script when script file is deleted

Also fixed copyright in gm_jsobect.{cpp,h}

src/plugins/GreaseMonkey/gm_jsobject.cpp

@@ -1,5 +1,5 @@
 /* ============================================================
-* QupZilla - WebKit based browser
+* GreaseMonkey plugin for QupZilla
 * Copyright (C) 2013  David Rosca <nowrep@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify

src/plugins/GreaseMonkey/gm_jsobject.h

@@ -1,5 +1,5 @@
 /* ============================================================
-* QupZilla - WebKit based browser
+* GreaseMonkey plugin for QupZilla
 * Copyright (C) 2013  David Rosca <nowrep@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify

src/plugins/GreaseMonkey/gm_manager.cpp

@@ -139,7 +139,7 @@ void GM_Manager::disableScript(GM_Script* script)
 
 bool GM_Manager::addScript(GM_Script* script)
 {
-    if (!script) {
+    if (!script || !script->isValid()) {
         return false;
     }
 

src/plugins/GreaseMonkey/gm_plugin.cpp

@@ -38,7 +38,7 @@ PluginSpec GM_Plugin::pluginSpec()
     spec.name = "GreaseMonkey";
     spec.info = "Userscripts for QupZilla";
     spec.description = "Provides support for userscripts (www.userscripts.org)";
-    spec.version = "0.3.0";
+    spec.version = "0.3.1";
     spec.author = "David Rosca <nowrep@gmail.com>";
     spec.icon = QPixmap(":gm/data/icon.png");
     spec.hasSettings = true;

src/plugins/GreaseMonkey/gm_script.cpp

@@ -30,7 +30,11 @@ GM_Script::GM_Script(GM_Manager* manager, const QString &filePath)
     : QObject(manager)
     , m_manager(manager)
     , m_fileWatcher(new QFileSystemWatcher(this))
+    , m_namespace("GreaseMonkeyNS")
+    , m_startAt(DocumentEnd)
     , m_fileName(filePath)
+    , m_enabled(true)
+    , m_valid(false)
 {
     parseScript();
 
@@ -146,6 +150,10 @@ void GM_Script::watchedFileChanged(const QString &file)
     if (m_fileName == file) {
         parseScript();
 
+        if (!isValid()) {
+            return;
+        }
+
         m_manager->removeScript(this, false);
         m_manager->addScript(this);
     }
@@ -153,6 +161,12 @@ void GM_Script::watchedFileChanged(const QString &file)
 
 void GM_Script::parseScript()
 {
+    QFile file(m_fileName);
+    if (!file.open(QFile::ReadOnly)) {
+        qWarning() << "GreaseMonkey: Cannot open file for reading" << m_fileName;
+        return;
+    }
+
     m_name.clear();
     m_namespace = "GreaseMonkeyNS";
     m_description.clear();
@@ -164,12 +178,6 @@ void GM_Script::parseScript()
     m_enabled = true;
     m_valid = false;
 
-    QFile file(m_fileName);
-    if (!file.open(QFile::ReadOnly)) {
-        qWarning() << "GreaseMonkey: Cannot open file for reading" << m_fileName;
-        return;
-    }
-
     if (!m_fileWatcher->files().contains(m_fileName)) {
         m_fileWatcher->addPath(m_fileName);
     }