Action to execute external make command and ask for unsaved sources.

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>

12 files changed, 503 insertions, 9 deletions

diff --git a/qtmips_gui/MainWindow.ui b/qtmips_gui/MainWindow.ui
index aa01737..0e51abc 100644
--- a/qtmips_gui/MainWindow.ui
+++ b/qtmips_gui/MainWindow.ui
@@ -104,6 +104,7 @@
     <addaction name="actionMnemonicRegisters"/>
     <addaction name="actionShow_Symbol"/>
     <addaction name="actionCompileSource"/>
+    <addaction name="actionBuildExe"/>
    </widget>
    <widget class="QMenu" name="menuHelp">
     <property name="title">
@@ -150,6 +151,7 @@
    <addaction name="actionOpen"/>
    <addaction name="actionSave"/>
    <addaction name="actionCompileSource"/>
+   <addaction name="actionBuildExe"/>
   </widget>
   <action name="actionNewMachine">
    <property name="icon">
@@ -263,6 +265,24 @@
     <string>Ctrl+C</string>
    </property>
   </action>
+  <action name="actionBuildExe">
+   <property name="enabled">
+    <bool>true</bool>
+   </property>
+   <property name="icon">
+    <iconset resource="icons.qrc">
+     <normaloff>:/icons/build-256.png</normaloff>:/icons/build-256.png</iconset>
+   </property>
+   <property name="text">
+    <string>Build Executable</string>
+   </property>
+   <property name="toolTip">
+    <string>Build executable by external make</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+B</string>
+   </property>
+  </action>
   <action name="actionExit">
    <property name="icon">
     <iconset resource="icons.qrc">
diff --git a/qtmips_gui/extprocess.cpp b/qtmips_gui/extprocess.cpp
new file mode 100644
index 0000000..18cc3c3
--- /dev/null
+++ b/qtmips_gui/extprocess.cpp
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*******************************************************************************
+ * QtMips - MIPS 32-bit Architecture Subset Simulator
+ *
+ * Implemented to support following courses:
+ *
+ *   B35APO - Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b35apo
+ *
+ *   B4M35PAP - Advanced Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
+ *
+ * Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
+ * Copyright (c) 2019      Pavel Pisa <pisa@cmp.felk.cvut.cz>
+ *
+ * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+ * Czech Technical University        (http://www.cvut.cz/)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ ******************************************************************************/
+
+#include <QFileInfo>
+#include <QDir>
+#include "extprocess.h"
+#include <iostream>
+#include <fstream>
+#include <iomanip>
+#include <typeinfo>
+
+using namespace std;
+
+ExtProcess::ExtProcess(QObject *parent) : Super(parent) {
+    setProcessChannelMode(QProcess::MergedChannels);
+    connect(this, SIGNAL(readyReadStandardOutput()), this, SLOT(process_output()));
+    connect(this, SIGNAL(finished(int,QProcess::ExitStatus)),
+            this, SLOT(report_finished(int,QProcess::ExitStatus)));
+    connect(this, SIGNAL(started()), this, SLOT(report_started()));
+}
+
+void ExtProcess::report_finished(int exitCode, QProcess::ExitStatus exitStatus) {
+    if ((exitStatus != QProcess::NormalExit) || (exitCode != 0))
+        report_message(messagetype::MSG_FINISH, "", 0, 0, program() +
+                       ": failed - exit code " + QString::number(exitCode), "");
+    else
+        report_message(messagetype::MSG_FINISH, "", 0, 0, program() +
+                       ": finished", "");
+    deleteLater();
+}
+
+void ExtProcess::report_started() {
+    report_message(messagetype::MSG_START, "", 0, 0, program() + ": started", "");
+}
+
+void ExtProcess::process_output()
+{
+    QString file = "";
+    int ln = 0;
+    int col = 0;
+    messagetype::Type type = messagetype::MSG_INFO;
+    if (!canReadLine())
+        return;
+    QString line = QString::fromLocal8Bit(readLine());
+    while (line.count() > 0) {
+        if (line.at(line.count() - 1) != '\n' &&
+            line.at(line.count() - 1) != '\r')
+            break;
+        line.truncate(line.count() - 1);
+    }
+
+    int pos = line.indexOf(':');
+    if (pos >= 0) {
+        QFileInfo fi(QDir(workingDirectory()), line.mid(0, pos));
+        line = line.mid(pos + 1);
+        file = fi.absoluteFilePath();
+    }
+
+    for(pos = 0; line.count() > pos && line.at(pos).isDigit(); pos++);
+    if ((pos < line.count()) && (line.at(pos) == ':')) {
+        ln = line.mid(0, pos).toInt();
+        line = line.mid(pos + 1);
+    }
+
+    for(pos = 0; line.count() > pos && line.at(pos).isDigit(); pos++);
+    if ((pos < line.count()) && (line.at(pos) == ':')) {
+        col = line.mid(0, pos).toInt();
+        line = line.mid(pos + 1);
+    }
+
+    if (line.startsWith(' ')) {
+        line = line.mid(1);
+    }
+    if (line.startsWith('\t')) {
+        line = line.mid(1);
+    }
+    if (line.startsWith("error:", Qt::CaseInsensitive)) {
+        type = messagetype::MSG_ERROR;
+    } else if (line.startsWith("warning:", Qt::CaseInsensitive)) {
+        type = messagetype::MSG_WARNING;
+    }
+
+    report_message(type, file, ln, col, line, "");
+}
diff --git a/qtmips_gui/extprocess.h b/qtmips_gui/extprocess.h
new file mode 100644
index 0000000..24cc5da
--- /dev/null
+++ b/qtmips_gui/extprocess.h
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*******************************************************************************
+ * QtMips - MIPS 32-bit Architecture Subset Simulator
+ *
+ * Implemented to support following courses:
+ *
+ *   B35APO - Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b35apo
+ *
+ *   B4M35PAP - Advanced Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
+ *
+ * Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
+ * Copyright (c) 2019      Pavel Pisa <pisa@cmp.felk.cvut.cz>
+ *
+ * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+ * Czech Technical University        (http://www.cvut.cz/)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ ******************************************************************************/
+
+#ifndef MSGREPORT_H
+#define MSGREPORT_H
+
+#include <QProcess>
+#include <QString>
+#include "messagetype.h"
+
+class ExtProcess : public QProcess {
+    Q_OBJECT
+
+    using Super = QProcess;
+
+public:
+    ExtProcess(QObject *parent = nullptr);
+
+signals:
+    void report_message(messagetype::Type type, QString file, int line, int column, QString text, QString hint);
+
+protected slots:
+    void process_output();
+    void report_started();
+    void report_finished(int exitCode, QProcess::ExitStatus exitStatus);
+
+protected:
+    QByteArray m_buffer;
+};
+
+#endif // MSGREPORT_H
diff --git a/qtmips_gui/icons.qrc b/qtmips_gui/icons.qrc
index b43e84f..91ccd98 100644
--- a/qtmips_gui/icons.qrc
+++ b/qtmips_gui/icons.qrc
@@ -16,5 +16,6 @@
         <file>icons/save.png</file>
         <file>icons/closetab.png</file>
         <file>icons/compfile-256.png</file>
+        <file>icons/build-256.png</file>
     </qresource>
 </RCC>
diff --git a/qtmips_gui/icons/build-256.png b/qtmips_gui/icons/build-256.png
new file mode 100644
index 0000000..b21fd38
--- /dev/null
+++ b/qtmips_gui/icons/build-256.png
diff --git a/qtmips_gui/mainwindow.cpp b/qtmips_gui/mainwindow.cpp
index 3af5e47..db9acce 100644
--- a/qtmips_gui/mainwindow.cpp
+++ b/qtmips_gui/mainwindow.cpp
@@ -51,6 +51,8 @@
 #include "gotosymboldialog.h"
 #include "fixmatheval.h"
 #include "simpleasm.h"
+#include "extprocess.h"
+#include "savechangeddialog.h"
 
 #ifdef __EMSCRIPTEN__
 #include <QFileInfo>
@@ -120,6 +122,7 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) {
     connect(ui->actionClose, SIGNAL(triggered(bool)), this, SLOT(close_source()));
     connect(ui->actionMnemonicRegisters, SIGNAL(triggered(bool)), this, SLOT(view_mnemonics_registers(bool)));
     connect(ui->actionCompileSource, SIGNAL(triggered(bool)), this, SLOT(compile_source()));
+    connect(ui->actionBuildExe, SIGNAL(triggered(bool)), this, SLOT(build_execute()));
     connect(ui->actionShow_Symbol, SIGNAL(triggered(bool)), this, SLOT(show_symbol_dialog()));
     connect(ui->actionRegisters, SIGNAL(triggered(bool)), this, SLOT(show_registers()));
     connect(ui->actionProgram_memory, SIGNAL(triggered(bool)), this, SLOT(show_program()));
@@ -164,6 +167,10 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) {
             delete(editor);
         }
     }
+
+#ifdef __EMSCRIPTEN__
+    ui->actionBuildExe->setEnabled(false);
+#endif
 }
 
 MainWindow::~MainWindow() {
@@ -310,10 +317,10 @@ void MainWindow::new_machine() {
     ndialog->show();
 }
 
-void MainWindow::machine_reload(bool force_memory_reset) {
+void MainWindow::machine_reload(bool force_memory_reset, bool force_elf_load) {
     if (machine == nullptr)
         return new_machine();
-    bool load_executable = machine->executable_loaded();
+    bool load_executable = force_elf_load || machine->executable_loaded();
     machine::MachineConfig cnf(&machine->config()); // We have to make local copy as create_core will delete current machine
     try {
         create_core(cnf, load_executable, !load_executable && !force_memory_reset);
@@ -334,7 +341,7 @@ void MainWindow::print_action() {
     QPrintDialog print_dialog(&printer, this);
     if (print_dialog.exec() == QDialog::Accepted) {
         QRectF scene_rect = corescene->sceneRect();
-        if (printer.outputFormat() == QPrinter::PdfFormat && scene_rect.height()) {
+        if (printer.outputFormat() == QPrinter::PdfFormat && (scene_rect.height() != 0)) {
             QPageLayout layout = printer.pageLayout();
             layout.setOrientation(QPageLayout::Portrait);
             QPageSize pagesize = layout.pageSize();
@@ -541,6 +548,27 @@ void MainWindow::update_open_file_list() {
     settings->setValue("openSrcFiles", open_src_files);
 }
 
+bool MainWindow::modified_file_list(QStringList &list) {
+    bool ret = false;
+    list.clear();
+    QStringList open_src_files;
+    if (central_window == nullptr)
+        return false;
+    for (int i = 0; i < central_window->count(); i++) {
+        QWidget *w = central_window->widget(i);
+        SrcEditor *editor = dynamic_cast<SrcEditor *>(w);
+        if (editor == nullptr)
+            continue;
+        if (editor->filename() == "")
+            continue;
+        if (!editor->isModified())
+            continue;
+        ret = true;
+        list.append(editor->filename());
+    }
+    return ret;
+}
+
 static int compare_filenames(const QString &filename1, const QString &filename2) {
     QFileInfo fi1(filename1);
     QFileInfo fi2(filename2);
@@ -557,7 +585,7 @@ SrcEditor *MainWindow::source_editor_for_file(QString filename, bool open) {
     if (central_window == nullptr)
         return nullptr;
     int found_match = 0;
-    SrcEditor *found_editor;
+    SrcEditor *found_editor = nullptr;
     for (int i = 0; i < central_window->count(); i++) {
         QWidget *w = central_window->widget(i);
         SrcEditor *editor = dynamic_cast<SrcEditor *>(w);
@@ -596,7 +624,7 @@ void MainWindow::open_source() {
 #ifndef __EMSCRIPTEN__
     QString file_name = "";
 
-    file_name = QFileDialog::getOpenFileName(this, tr("Open File"), "", "Source Files (*.asm *.S *.s)");
+    file_name = QFileDialog::getOpenFileName(this, tr("Open File"), "", "Source Files (*.asm *.S *.s *.c Makefile)");
 
     if (!file_name.isEmpty()) {
         SrcEditor *editor = source_editor_for_file(file_name, false);
@@ -705,6 +733,8 @@ void MainWindow::message_selected(messagetype::Type type, QString file, int line
     (void)text;
     (void)hint;
 
+    if (file.isEmpty())
+        return;
     SrcEditor *editor = source_editor_for_file(file, true);
     if (editor == nullptr)
         return;
@@ -758,3 +788,69 @@ void MainWindow::compile_source() {
     if (error_occured)
         show_messages();
 }
+
+void MainWindow::build_execute() {
+    QStringList list;
+    if (modified_file_list(list)) {
+        SaveChnagedDialog *dialog = new SaveChnagedDialog(list, this);
+        connect(dialog, SIGNAL(user_decision(bool,QStringList&)),
+                this, SLOT(build_execute_with_save(bool,QStringList&)));
+        dialog->open();
+    } else {
+        build_execute_no_check();
+    }
+}
+
+void MainWindow::build_execute_with_save(bool cancel, QStringList &tosavelist) {
+    if (cancel)
+        return;
+    for (const auto &fname : tosavelist) {
+        SrcEditor *editor = source_editor_for_file(fname, false);
+        editor->saveFile();
+    }
+    build_execute_no_check();
+}
+
+void MainWindow::build_execute_no_check() {
+    QString work_dir = "";
+    ExtProcess *proc;
+    ExtProcess *procptr = build_process;
+    if (procptr != nullptr) {
+        procptr->close();
+        procptr->deleteLater();
+    }
+
+    emit clear_messages();
+    show_messages();
+    proc = new ExtProcess(this);
+    build_process = procptr;
+    connect(proc, SIGNAL(report_message(messagetype::Type,QString,int,int,QString,QString)),
+            this, SIGNAL(report_message(messagetype::Type,QString,int,int,QString,QString)));
+    connect(proc, SIGNAL(finished(int,QProcess::ExitStatus)),
+            this, SLOT(build_execute_finished(int,QProcess::ExitStatus)));
+    if (current_srceditor != nullptr) {
+        if (!current_srceditor->filename().isEmpty()) {
+            QFileInfo fi(current_srceditor->filename());
+            work_dir = fi.dir().path();
+        }
+    }
+    if (work_dir.isEmpty() && (machine != nullptr)) {
+        if (!machine->config().elf().isEmpty()) {
+            QFileInfo fi(machine->config().elf());
+            work_dir = fi.dir().path();
+        }
+    }
+    if (!work_dir.isEmpty())
+        proc->setWorkingDirectory(work_dir);
+    proc->start("make", QProcess::Unbuffered | QProcess::ReadOnly);
+}
+
+void MainWindow::build_execute_finished(int exitCode, QProcess::ExitStatus exitStatus) {
+    if ((exitStatus != QProcess::NormalExit) || (exitCode != 0))
+        return;
+
+    if (machine != nullptr) {
+        if (machine->config().reset_at_compile())
+            machine_reload(true, true);
+    }
+}
diff --git a/qtmips_gui/mainwindow.h b/qtmips_gui/mainwindow.h
index d48ccda..09c82fd 100644
--- a/qtmips_gui/mainwindow.h
+++ b/qtmips_gui/mainwindow.h
@@ -39,6 +39,8 @@
 #include <QMainWindow>
 #include <QSettings>
 #include <QTabWidget>
+#include <QPointer>
+
 #include "ui_MainWindow.h"
 #include "newdialog.h"
 #include "coreview.h"
@@ -51,6 +53,7 @@
 #include "lcddisplaydock.h"
 #include "cop0dock.h"
 #include "messagesdock.h"
+#include "extprocess.h"
 
 #include "qtmipsmachine.h"
 #include "machineconfig.h"
@@ -60,7 +63,7 @@ class MainWindow : public QMainWindow {
     Q_OBJECT
 
 public:
-    explicit MainWindow(QWidget *parent = 0);
+    explicit MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
 
     void start();
@@ -77,7 +80,7 @@ signals:
 public slots:
     // Actions signals
     void new_machine();
-    void machine_reload(bool force_memory_reset = false);
+    void machine_reload(bool force_memory_reset = false, bool force_elf_load = false);
     void print_action();
     void new_source();
     void open_source();
@@ -85,6 +88,9 @@ public slots:
     void save_source_as();
     void close_source();
     void compile_source();
+    void build_execute();
+    void build_execute_no_check();
+    void build_execute_with_save(bool cancel, QStringList &tosavelist);
     void show_registers();
     void show_program();
     void show_memory();
@@ -117,6 +123,7 @@ protected:
 
 protected slots:
     void src_editor_save_to(QString filename);
+    void build_execute_finished(int exitCode, QProcess::ExitStatus exitStatus);
 
 private:
     Ui::MainWindow *ui;
@@ -148,7 +155,9 @@ private:
     void show_dockwidget(QDockWidget *w, Qt::DockWidgetArea area = Qt::RightDockWidgetArea);
     void add_src_editor_to_tabs(SrcEditor *editor);
     void update_open_file_list();
+    bool modified_file_list(QStringList &list);
     SrcEditor *source_editor_for_file(QString filename, bool open);
+    QPointer<ExtProcess> build_process;
 };
 
 #endif // MAINWINDOW_H
diff --git a/qtmips_gui/qtmips_gui.pro b/qtmips_gui/qtmips_gui.pro
index 6cf1c06..16cd5cf 100644
--- a/qtmips_gui/qtmips_gui.pro
+++ b/qtmips_gui/qtmips_gui.pro
@@ -80,7 +80,9 @@ SOURCES += \
     highlighterc.cpp \
     messagesdock.cpp \
     messagesmodel.cpp \
-    messagesview.cpp
+    messagesview.cpp \
+    extprocess.cpp \
+    savechangeddialog.cpp
 
 HEADERS += \
         mainwindow.h \
@@ -129,7 +131,9 @@ HEADERS += \
     highlighterc.h \
     messagesdock.h \
     messagesmodel.h \
-    messagesview.h
+    messagesview.h \
+    extprocess.h \
+    savechangeddialog.h
 
 wasm: SOURCES += \
     qhtml5file_html5.cpp
diff --git a/qtmips_gui/savechangeddialog.cpp b/qtmips_gui/savechangeddialog.cpp
new file mode 100644
index 0000000..dda1949
--- /dev/null
+++ b/qtmips_gui/savechangeddialog.cpp
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*******************************************************************************
+ * QtMips - MIPS 32-bit Architecture Subset Simulator
+ *
+ * Implemented to support following courses:
+ *
+ *   B35APO - Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b35apo
+ *
+ *   B4M35PAP - Advanced Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
+ *
+ * Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
+ * Copyright (c) 2019      Pavel Pisa <pisa@cmp.felk.cvut.cz>
+ *
+ * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+ * Czech Technical University        (http://www.cvut.cz/)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ ******************************************************************************/
+
+#include "savechangeddialog.h"
+#include <QTabWidget>
+#include <QVBoxLayout>
+#include <QPlainTextEdit>
+#include <QLabel>
+#include <QPushButton>
+#include <QStandardItem>
+#include <QListView>
+
+SaveChnagedDialog::SaveChnagedDialog(QStringList &changedlist, QWidget *parent) :
+    QDialog(parent)
+{
+    setAttribute(Qt::WA_DeleteOnClose);
+    setAttribute(Qt::WA_ShowModal);
+    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+    setWindowTitle(tr("Save next modified files?"));
+
+    model = new QStandardItemModel(this);
+
+    for ( const auto& fname : changedlist) {
+        int row = model->rowCount();
+        QStandardItem* item = new QStandardItem();
+        item->setText(fname);
+        item->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled);
+        item->setCheckState(Qt::Checked);
+        model->setItem(row, 0, item);
+    }
+
+    QVBoxLayout *all = new QVBoxLayout(this);
+
+    QListView *listview = new QListView(this);
+    listview->setModel(model);
+    listview->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+    all->addWidget(listview);
+
+    QWidget *hbBtn = new QWidget();
+    QHBoxLayout *hlBtn = new QHBoxLayout(hbBtn);
+
+    QPushButton *cancelButton = new QPushButton(tr("&Cancel"), parent);
+    QPushButton *ignoreButton = new QPushButton(tr("&Ignore"), parent);
+    QPushButton *saveButton = new QPushButton(tr("&Save"), parent);
+    saveButton->setFocus();
+    connect(cancelButton, SIGNAL(clicked()), this, SLOT(cancel_clicked()));
+    connect(ignoreButton, SIGNAL(clicked()), this, SLOT(ignore_clicked()));
+    connect(saveButton, SIGNAL(clicked()), this, SLOT(save_clicked()));
+    hlBtn->addWidget(cancelButton);
+    hlBtn->addStretch();
+    hlBtn->addWidget(ignoreButton);
+    hlBtn->addStretch();
+    hlBtn->addWidget(saveButton);
+
+    all->addWidget(hbBtn);
+
+    setMinimumSize(400, 300);
+}
+
+SaveChnagedDialog::~SaveChnagedDialog()
+{
+}
+
+void SaveChnagedDialog::cancel_clicked() {
+    QStringList list;
+    emit user_decision(true, list);
+    close();
+}
+
+void SaveChnagedDialog::ignore_clicked() {
+    QStringList list;
+    emit user_decision(false, list);
+    close();
+}
+
+void SaveChnagedDialog::save_clicked() {
+    QStringList list;
+    for(int r = 0; r < model->rowCount(); ++r) {
+        if (model->item(r)->checkState() == Qt::Checked)
+            list.append(model->item(r)->text());
+    }
+    emit user_decision(false, list);
+    close();
+}
+
diff --git a/qtmips_gui/savechangeddialog.h b/qtmips_gui/savechangeddialog.h
new file mode 100644
index 0000000..34eb5cd
--- /dev/null
+++ b/qtmips_gui/savechangeddialog.h
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*******************************************************************************
+ * QtMips - MIPS 32-bit Architecture Subset Simulator
+ *
+ * Implemented to support following courses:
+ *
+ *   B35APO - Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b35apo
+ *
+ *   B4M35PAP - Advanced Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
+ *
+ * Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
+ * Copyright (c) 2019      Pavel Pisa <pisa@cmp.felk.cvut.cz>
+ *
+ * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+ * Czech Technical University        (http://www.cvut.cz/)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ ******************************************************************************/
+
+#ifndef SAVECHANGED_H
+#define SAVECHANGED_H
+
+#include <QDialog>
+#include <QList>
+#include <QStringList>
+#include <QStandardItemModel>
+
+class SaveChnagedDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit SaveChnagedDialog(QStringList &changedlist, QWidget *parent= nullptr);
+    ~SaveChnagedDialog();
+signals:
+    void user_decision(bool cancel, QStringList &tosavelist);
+private slots:
+    void cancel_clicked();
+    void ignore_clicked();
+    void save_clicked();
+private:
+    QStandardItemModel *model;
+};
+
+#endif // SAVECHANGED_H
diff --git a/qtmips_gui/srceditor.cpp b/qtmips_gui/srceditor.cpp
index 8b0000d..18da3b5 100644
--- a/qtmips_gui/srceditor.cpp
+++ b/qtmips_gui/srceditor.cpp
@@ -116,6 +116,8 @@ bool SrcEditor::saveFile(QString filename) {
     writer.setFormat("plaintext");
     bool success = writer.write(document());
     setFileName(filename);
+    if (success)
+        document()->setModified(false);
     return success;
 }
 
@@ -123,3 +125,7 @@ void SrcEditor::setCursorToLine(int ln) {
     QTextCursor cursor(document()->findBlockByLineNumber(ln-1));
     setTextCursor(cursor);
 }
+
+bool SrcEditor::isModified() const {
+    return document()->isModified();
+}
diff --git a/qtmips_gui/srceditor.h b/qtmips_gui/srceditor.h
index 02650e5..880520e 100644
--- a/qtmips_gui/srceditor.h
+++ b/qtmips_gui/srceditor.h
@@ -55,6 +55,7 @@ public:
     bool loadByteArray(const QByteArray &content, QString filename = "");
     void setCursorToLine(int ln);
     void setFileName(QString filename);
+    bool isModified() const;
 private:
     QSyntaxHighlighter *highlighter;
     void setup_common();