Python editor: Add buttons & actions for opening REPL

Opens interactive Python, optionally with the current file imported, for
testing and experimentation.

Change-Id: Ieb120e3698bdba77a1445c40fe7fda533773a0cf
Reviewed-by: David Schulz <david.schulz@qt.io>

src/libs/utils/consoleprocess.cpp

@@ -136,6 +136,11 @@ void ConsoleProcess::setCommand(const CommandLine &command)
     d->m_commandLine = command;
 }
 
+CommandLine ConsoleProcess::command() const
+{
+    return d->m_commandLine;
+}
+
 void ConsoleProcess::setSettings(QSettings *settings)
 {
     d->m_settings = settings;

src/libs/utils/consoleprocess.h

@@ -65,6 +65,7 @@ public:
     ~ConsoleProcess() override;
 
     void setCommand(const Utils::CommandLine &command);
+    Utils::CommandLine command() const;
     void setAbortOnMetaChars(bool abort);
 
     void setWorkingDirectory(const QString &dir);

src/plugins/python/pythonconstants.h

@@ -37,6 +37,10 @@ const char C_EDITOR_DISPLAY_NAME[] =
 const char C_PYTHONOPTIONS_PAGE_ID[] = "PythonEditor.OptionsPage";
 const char C_PYTHON_SETTINGS_CATEGORY[] = "P.Python";
 
+const char PYTHON_OPEN_REPL[] = "Python.OpenRepl";
+const char PYTHON_OPEN_REPL_IMPORT[] = "Python.OpenReplImport";
+const char PYTHON_OPEN_REPL_IMPORT_TOPLEVEL[] = "Python.OpenReplImportToplevel";
+
 /*******************************************************************************
  * MIME type
  ******************************************************************************/

src/plugins/python/pythoneditor.cpp

@@ -27,16 +27,81 @@
 #include "pythonconstants.h"
 #include "pythonhighlighter.h"
 #include "pythonindenter.h"
+#include "pythonsettings.h"
 #include "pythonutils.h"
 
+#include <coreplugin/actionmanager/actionmanager.h>
+#include <coreplugin/actionmanager/commandbutton.h>
+
 #include <texteditor/textdocument.h>
 #include <texteditor/texteditoractionhandler.h>
 
+#include <QAction>
+#include <QMenu>
+
 namespace Python {
 namespace Internal {
 
+static QAction *createAction(QObject *parent, ReplType type)
+{
+    QAction *action = new QAction(parent);
+    switch (type) {
+    case ReplType::Unmodified:
+        action->setText(QCoreApplication::translate("Python", "REPL"));
+        action->setToolTip(QCoreApplication::translate("Python", "Open interactive Python."));
+        break;
+    case ReplType::Import:
+        action->setText(QCoreApplication::translate("Python", "REPL Import File"));
+        action->setToolTip(
+            QCoreApplication::translate("Python", "Open interactive Python and import file."));
+        break;
+    case ReplType::ImportToplevel:
+        action->setText(QCoreApplication::translate("Python", "REPL Import *"));
+        action->setToolTip(
+            QCoreApplication::translate("Python",
+                                        "Open interactive Python and import * from file."));
+        break;
+    }
+
+    QObject::connect(action, &QAction::triggered, parent, [type] {
+        Core::IDocument *doc = Core::EditorManager::currentDocument();
+        openPythonRepl(doc ? doc->filePath() : Utils::FilePath(), type);
+    });
+    return action;
+}
+
+static void registerReplAction(QObject *parent)
+{
+    Core::ActionManager::registerAction(createAction(parent, ReplType::Unmodified),
+                                        Constants::PYTHON_OPEN_REPL);
+    Core::ActionManager::registerAction(createAction(parent, ReplType::Import),
+                                        Constants::PYTHON_OPEN_REPL_IMPORT);
+    Core::ActionManager::registerAction(createAction(parent, ReplType::ImportToplevel),
+                                        Constants::PYTHON_OPEN_REPL_IMPORT_TOPLEVEL);
+}
+
+static QWidget *createEditorWidget()
+{
+    auto widget = new TextEditor::TextEditorWidget;
+    auto replButton = new QToolButton(widget);
+    replButton->setProperty("noArrow", true);
+    replButton->setText(QCoreApplication::translate("Python", "REPL"));
+    replButton->setPopupMode(QToolButton::InstantPopup);
+    auto menu = new QMenu(replButton);
+    replButton->setMenu(menu);
+    menu->addAction(Core::ActionManager::command(Constants::PYTHON_OPEN_REPL)->action());
+    menu->addSeparator();
+    menu->addAction(Core::ActionManager::command(Constants::PYTHON_OPEN_REPL_IMPORT)->action());
+    menu->addAction(
+        Core::ActionManager::command(Constants::PYTHON_OPEN_REPL_IMPORT_TOPLEVEL)->action());
+    widget->insertExtraToolBarWidget(TextEditor::TextEditorWidget::Left, replButton);
+    return widget;
+}
+
 PythonEditorFactory::PythonEditorFactory()
 {
+    registerReplAction(this);
+
     setId(Constants::C_PYTHONEDITOR_ID);
     setDisplayName(
         QCoreApplication::translate("OpenWith::Editors", Constants::C_EDITOR_DISPLAY_NAME));
@@ -48,6 +113,7 @@ PythonEditorFactory::PythonEditorFactory()
                             | TextEditor::TextEditorActionHandler::FollowSymbolUnderCursor);
 
     setDocumentCreator([] { return new TextEditor::TextDocument(Constants::C_PYTHONEDITOR_ID); });
+    setEditorWidgetCreator(createEditorWidget);
     setIndenterCreator([](QTextDocument *doc) { return new PythonIndenter(doc); });
     setSyntaxHighlighterCreator([] { return new PythonHighlighter; });
     setCommentDefinition(Utils::CommentDefinition::HashStyle);

src/plugins/python/pythonutils.cpp

@@ -43,6 +43,8 @@
 
 #include <texteditor/textdocument.h>
 
+#include <utils/consoleprocess.h>
+#include <utils/mimetypes/mimedatabase.h>
 #include <utils/qtcassert.h>
 #include <utils/runextensions.h>
 #include <utils/synchronousprocess.h>
@@ -170,7 +172,9 @@ static FilePath detectPython(const FilePath &documentPath)
 {
     FilePath python;
 
-    PythonProject *project = qobject_cast<PythonProject *>(
+    PythonProject *project = documentPath.isEmpty()
+                                 ? nullptr
+                                 : qobject_cast<PythonProject *>(
                                      ProjectExplorer::SessionManager::projectForFile(documentPath));
     if (!project)
         project = qobject_cast<PythonProject *>(ProjectExplorer::SessionManager::startupProject());
@@ -480,6 +484,55 @@ PyLSConfigureAssistant::PyLSConfigureAssistant(QObject *parent)
             });
 }
 
+static QStringList replImportArgs(const FilePath &pythonFile, ReplType type)
+{
+    using MimeTypes = QList<MimeType>;
+    const MimeTypes mimeTypes = pythonFile.isEmpty() || type == ReplType::Unmodified
+                                    ? MimeTypes()
+                                    : mimeTypesForFileName(pythonFile.toString());
+    const bool isPython = Utils::anyOf(mimeTypes, [](const MimeType &mt) {
+        return mt.inherits("text/x-python") || mt.inherits("text/x-python3");
+    });
+    if (type == ReplType::Unmodified || !isPython)
+        return {};
+    const auto import = type == ReplType::Import
+                            ? QString("import %1").arg(pythonFile.toFileInfo().completeBaseName())
+                            : QString("from %1 import *")
+                                  .arg(pythonFile.toFileInfo().completeBaseName());
+    return {"-c", QString("%1; print('Running \"%1\"')").arg(import)};
+}
+
+void openPythonRepl(const FilePath &file, ReplType type)
+{
+    static const auto workingDir = [](const FilePath &file) {
+        if (file.isEmpty()) {
+            if (ProjectExplorer::Project *project = ProjectExplorer::SessionManager::startupProject())
+                return project->projectDirectory().toFileInfo().filePath();
+            return QDir::currentPath();
+        }
+        return file.toFileInfo().path();
+    };
+
+    const auto args = QStringList{"-i"} + replImportArgs(file, type);
+    auto process = new ConsoleProcess;
+    const FilePath pythonCommand = detectPython(file);
+    process->setCommand({pythonCommand, args});
+    process->setWorkingDirectory(workingDir(file));
+    const QString commandLine = process->command().toUserOutput();
+    QObject::connect(process,
+                     &ConsoleProcess::processError,
+                     process,
+                     [process, commandLine](const QString &errorString) {
+                         Core::MessageManager::write(
+                             QCoreApplication::translate("Python",
+                                                         "Failed to run Python (%1): \"%2\".")
+                                 .arg(commandLine, errorString));
+                         process->deleteLater();
+                     });
+    QObject::connect(process, &ConsoleProcess::stubStopped, process, &QObject::deleteLater);
+    process->start();
+}
+
 } // namespace Internal
 } // namespace Python
 

src/plugins/python/pythonutils.h

@@ -40,6 +40,10 @@ namespace TextEditor { class TextDocument; }
 namespace Python {
 namespace Internal {
 
+enum class ReplType { Unmodified, Import, ImportToplevel };
+
+void openPythonRepl(const Utils::FilePath &file, ReplType type);
+
 struct PythonLanguageServerState;
 
 class PyLSConfigureAssistant : public QObject