From c454c790fa87bf86553e545b9e183f84f1e3d995 Mon Sep 17 00:00:00 2001
From: David Rowe <david@ctrlaltstudio.com>
Date: Sun, 29 Jun 2014 21:31:28 -0700
Subject: [PATCH] Check script file for external changes when editor regains
 focus

Prompt user whether to reload.
---
 interface/src/ui/ScriptEditorWidget.cpp | 39 ++++++++++++++++++++++---
 interface/src/ui/ScriptEditorWidget.h   |  6 ++++
 interface/src/ui/ScriptEditorWindow.cpp | 11 +++++++
 interface/src/ui/ScriptEditorWindow.h   |  4 +++
 4 files changed, 56 insertions(+), 4 deletions(-)

diff --git a/interface/src/ui/ScriptEditorWidget.cpp b/interface/src/ui/ScriptEditorWidget.cpp
index 4d73ab26bd..3829cb6a2e 100644
--- a/interface/src/ui/ScriptEditorWidget.cpp
+++ b/interface/src/ui/ScriptEditorWidget.cpp
@@ -29,8 +29,11 @@
 ScriptEditorWidget::ScriptEditorWidget() :
     _scriptEditorWidgetUI(new Ui::ScriptEditorWidget),
     _scriptEngine(NULL),
-    _isRestarting(false)
+    _isRestarting(false),
+    _isReloading(false)
 {
+    setAttribute(Qt::WA_DeleteOnClose);
+
     _scriptEditorWidgetUI->setupUi(this);
 
     connect(_scriptEditorWidgetUI->scriptEdit->document(), &QTextDocument::modificationChanged, this,
@@ -52,7 +55,7 @@ ScriptEditorWidget::~ScriptEditorWidget() {
 }
 
 void ScriptEditorWidget::onScriptModified() {
-    if(_scriptEditorWidgetUI->onTheFlyCheckBox->isChecked() && isModified() && isRunning()) {
+    if(_scriptEditorWidgetUI->onTheFlyCheckBox->isChecked() && isModified() && isRunning() && !_isReloading) {
         _isRestarting = true;
         setRunning(false);
         // Script is restarted once current script instance finishes.
@@ -76,7 +79,7 @@ bool ScriptEditorWidget::isRunning() {
 }
 
 bool ScriptEditorWidget::setRunning(bool run) {
-    if (run && !save()) {
+    if (run && isModified() && !save()) {
         return false;
     }
 
@@ -114,13 +117,14 @@ bool ScriptEditorWidget::saveFile(const QString &scriptPath) {
 
      QTextStream out(&file);
      out << _scriptEditorWidgetUI->scriptEdit->toPlainText();
+     file.close();
 
      setScriptFile(scriptPath);
      return true;
 }
 
 void ScriptEditorWidget::loadFile(const QString& scriptPath) {
-     QUrl url(scriptPath);
+    QUrl url(scriptPath);
 
     // if the scheme length is one or lower, maybe they typed in a file, let's try
     const int WINDOWS_DRIVE_LETTER_SIZE = 1;
@@ -133,6 +137,7 @@ void ScriptEditorWidget::loadFile(const QString& scriptPath) {
         }
         QTextStream in(&file);
         _scriptEditorWidgetUI->scriptEdit->setPlainText(in.readAll());
+        file.close();
         setScriptFile(scriptPath);
 
         if (_scriptEngine != NULL) {
@@ -184,6 +189,7 @@ bool ScriptEditorWidget::saveAs() {
 
 void ScriptEditorWidget::setScriptFile(const QString& scriptPath) {
     _currentScript = scriptPath;
+    _currentScriptModified = QFileInfo(_currentScript).lastModified();
     _scriptEditorWidgetUI->scriptEdit->document()->setModified(false);
     setWindowModified(false);
 
@@ -207,3 +213,28 @@ void ScriptEditorWidget::onScriptError(const QString& message) {
 void ScriptEditorWidget::onScriptPrint(const QString& message) {
     _scriptEditorWidgetUI->debugText->appendPlainText("> " + message);
 }
+
+void ScriptEditorWidget::onWindowActivated() {
+    if (!_isReloading) {
+        _isReloading = true;
+        
+        if (QFileInfo(_currentScript).lastModified() > _currentScriptModified) {
+            if (QMessageBox::warning(this, _currentScript,
+                tr("This file has been modified outside of the Interface editor.") + "\n\n"
+                    +(isModified()
+                    ? tr("Do you want to reload it and lose the changes you've made in the Interface editor?")
+                    : tr("Do you want to reload it?")),
+                QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes) {
+                loadFile(_currentScript);
+                if (_scriptEditorWidgetUI->onTheFlyCheckBox->isChecked() && isRunning()) {
+                    _isRestarting = true;
+                    setRunning(false);
+                    // Script is restarted once current script instance finishes.
+                }
+
+            }
+        }
+
+        _isReloading = false;
+    }
+}
diff --git a/interface/src/ui/ScriptEditorWidget.h b/interface/src/ui/ScriptEditorWidget.h
index d7fa615024..8dd847ee6d 100644
--- a/interface/src/ui/ScriptEditorWidget.h
+++ b/interface/src/ui/ScriptEditorWidget.h
@@ -13,6 +13,7 @@
 #define hifi_ScriptEditorWidget_h
 
 #include <QDockWidget>
+
 #include "ScriptEngine.h"
 
 namespace Ui {
@@ -42,6 +43,9 @@ signals:
     void scriptnameChanged();
     void scriptModified();
 
+public slots:
+    void onWindowActivated();
+
 private slots:
     void onScriptError(const QString& message);
     void onScriptPrint(const QString& message);
@@ -52,7 +56,9 @@ private:
     Ui::ScriptEditorWidget* _scriptEditorWidgetUI;
     ScriptEngine* _scriptEngine;
     QString _currentScript;
+    QDateTime _currentScriptModified;
     bool _isRestarting;
+    bool _isReloading;
 };
 
 #endif // hifi_ScriptEditorWidget_h
diff --git a/interface/src/ui/ScriptEditorWindow.cpp b/interface/src/ui/ScriptEditorWindow.cpp
index 3f63f0741b..7c8f5c79cb 100644
--- a/interface/src/ui/ScriptEditorWindow.cpp
+++ b/interface/src/ui/ScriptEditorWindow.cpp
@@ -36,6 +36,8 @@ ScriptEditorWindow::ScriptEditorWindow() :
     _loadMenu(new QMenu),
     _saveMenu(new QMenu)
 {
+    setAttribute(Qt::WA_DeleteOnClose);
+
     _ScriptEditorWindowUI->setupUi(this);
     this->setWindowFlags(Qt::Tool);
     show();
@@ -140,6 +142,7 @@ ScriptEditorWidget* ScriptEditorWindow::addScriptEditorWidget(QString title) {
     connect(newScriptEditorWidget, &ScriptEditorWidget::scriptnameChanged, this, &ScriptEditorWindow::updateScriptNameOrStatus);
     connect(newScriptEditorWidget, &ScriptEditorWidget::scriptModified, this, &ScriptEditorWindow::updateScriptNameOrStatus);
     connect(newScriptEditorWidget, &ScriptEditorWidget::runningStateChanged, this, &ScriptEditorWindow::updateButtons);
+    connect(this, &ScriptEditorWindow::windowActivated, newScriptEditorWidget, &ScriptEditorWidget::onWindowActivated);
     _ScriptEditorWindowUI->tabWidget->addTab(newScriptEditorWidget, title);
     _ScriptEditorWindowUI->tabWidget->setCurrentWidget(newScriptEditorWidget);
     newScriptEditorWidget->setUpdatesEnabled(true);
@@ -216,3 +219,11 @@ void ScriptEditorWindow::terminateCurrentTab() {
         this->raise();
     }
 }
+
+bool ScriptEditorWindow::event(QEvent* event) {
+    if (event->type() == QEvent::WindowActivate) {
+        emit windowActivated();
+    }
+    return QWidget::event(event);
+}
+
diff --git a/interface/src/ui/ScriptEditorWindow.h b/interface/src/ui/ScriptEditorWindow.h
index 360e902cc2..271a3d685b 100644
--- a/interface/src/ui/ScriptEditorWindow.h
+++ b/interface/src/ui/ScriptEditorWindow.h
@@ -27,8 +27,12 @@ public:
 
     void terminateCurrentTab();
 
+signals:
+    void windowActivated();
+
 protected:
     void closeEvent(QCloseEvent* event);
+    virtual bool event(QEvent* event);
 
 private:
     Ui::ScriptEditorWindow* _ScriptEditorWindowUI;