implement automatic completion popup and reformat on return

tools/lammps-gui/TODO.md

@@ -3,6 +3,9 @@ LAMMPS-GUI TODO list:
 # Short term goals
 
 - add "syntax check" with enabled "-skiprun" flag
+- implement "static" completion for fix/compute/styles/region etc...
+- implement "dynamic" completion for variable names, group names, molecule names, compute/dump/fix/region/group IDs
+- implement indenting regions for (nested) loops?
 
 # Long term ideas
 - rewrite entire application to build the App and its layout manually

tools/lammps-gui/codeeditor.cpp

@@ -290,9 +290,10 @@ void CodeEditor::setCommandList(const QStringList &words)
 
 void CodeEditor::keyPressEvent(QKeyEvent *event)
 {
+    const auto key = event->key();
     if (command_completer && command_completer->popup()->isVisible()) {
         // The following keys are forwarded by the completer to the widget
-        switch (event->key()) {
+        switch (key) {
             case Qt::Key_Enter:
             case Qt::Key_Return:
             case Qt::Key_Escape:
@@ -304,15 +305,47 @@ void CodeEditor::keyPressEvent(QKeyEvent *event)
                 break;
         }
     }
-    if (event->key() == Qt::Key_Tab) {
+
+    // reformat current line and consume key event
+    if (key == Qt::Key_Tab) {
         reformatCurrentLine();
         return;
     }
-    if (event->key() == Qt::Key_Backtab) {
+
+    // run command completion and consume key event
+    if (key == Qt::Key_Backtab) {
         runCompletion();
         return;
     }
+
+    // automatically reformat when hitting the return or enter key
+    if (reformat_on_return && (key == Qt::Key_Return) || (key == Qt::Key_Enter)) {
+        reformatCurrentLine();
+    }
+
+    // pass key event on to parent class
     QPlainTextEdit::keyPressEvent(event);
+
+    // pop up completion automatically after 3 characters
+    if (automatic_completion) {
+        auto cursor = textCursor();
+        auto line   = cursor.block().text().trimmed();
+        if (!line.isEmpty()) {
+            auto words = split_line(line.toStdString());
+            cursor.select(QTextCursor::WordUnderCursor);
+            auto word = cursor.selectedText().trimmed();
+            if (command_completer) {
+                if (words[0] == word.toStdString()) {
+                    if (word.length() > 2)
+                        runCompletion();
+                    else if (command_completer->popup()->isVisible())
+                        command_completer->popup()->hide();
+                } else {
+                    if (command_completer->popup()->isVisible()) command_completer->popup()->hide();
+                }
+            }
+        }
+    }
 }
 
 void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */)
@@ -475,6 +508,11 @@ void CodeEditor::runCompletion()
 
             command_completer->setCompletionPrefix(words[0].c_str());
             auto popup = command_completer->popup();
+            // if the command is already a complete command, remove existing popup
+            if (words[0] == command_completer->currentCompletion().toStdString()) {
+                if (popup->isVisible()) popup->hide();
+                return;
+            }
             QRect cr = cursorRect();
             cr.setWidth(popup->sizeHintForColumn(0) +
                         popup->verticalScrollBar()->sizeHint().width());

tools/lammps-gui/codeeditor.h

@@ -33,6 +33,8 @@ public:
     void setFont(const QFont &newfont);
     void setCursor(int block);
     void setHighlight(int block, bool error);
+    void setReformatOnReturn(bool flag) { reformat_on_return = flag; }
+    void setAutoComplete(bool flag) { automatic_completion = flag; }
     QString reformatLine(const QString &line);
     void setCommandList(const QStringList &words);
 
@@ -61,6 +63,8 @@ private:
     QShortcut *help_action;
     QCompleter *command_completer;
     int highlight;
+    bool reformat_on_return;
+    bool automatic_completion;
 
     QMap<QString, QString> cmd_map;
     QMap<QString, QString> fix_map;

tools/lammps-gui/lammpsgui.cpp

@@ -317,6 +317,10 @@ LammpsGui::LammpsGui(QWidget *parent, const char *filename) :
     }
     command_list.sort();
     ui->textEdit->setCommandList(command_list);
+    settings.beginGroup("reformat");
+    ui->textEdit->setReformatOnReturn(settings.value("return", true).toBool());
+    ui->textEdit->setAutoComplete(settings.value("automatic", true).toBool());
+    settings.endGroup();
 }
 
 LammpsGui::~LammpsGui()
@@ -1256,6 +1260,10 @@ void LammpsGui::preferences()
             lammpsstatus->hide();
         }
         if (imagewindow) imagewindow->createImage();
+        settings.beginGroup("reformat");
+        ui->textEdit->setReformatOnReturn(settings.value("return", true).toBool());
+        ui->textEdit->setAutoComplete(settings.value("automatic", true).toBool());
+        settings.endGroup();
     }
 }
 

tools/lammps-gui/preferences.cpp

@@ -178,7 +178,7 @@ void Preferences::accept()
         execl(path, arg0, (char *)NULL);
     }
 
-    // reformattting settings
+    // reformatting settings
 
     settings->beginGroup("reformat");
     auto spin = tabWidget->findChild<QSpinBox *>("cmdval");
@@ -189,6 +189,10 @@ void Preferences::accept()
     if (spin) settings->setValue("id", spin->value());
     spin = tabWidget->findChild<QSpinBox *>("nameval");
     if (spin) settings->setValue("name", spin->value());
+    box = tabWidget->findChild<QCheckBox *>("retval");
+    if (box) settings->setValue("return", box->isChecked());
+    box = tabWidget->findChild<QCheckBox *>("autoval");
+    if (box) settings->setValue("automatic", box->isChecked());
     settings->endGroup();
 
     QDialog::accept();
@@ -508,10 +512,14 @@ EditorTab::EditorTab(QSettings *_settings, QWidget *parent) : QWidget(parent), s
     auto *typelbl  = new QLabel("Type width:");
     auto *idlbl    = new QLabel("ID width:");
     auto *namelbl  = new QLabel("Name width:");
+    auto *retlbl   = new QLabel("Reformat with 'Return':");
+    auto *autolbl  = new QLabel("Automatic completion:");
     auto *cmdval   = new QSpinBox;
     auto *typeval  = new QSpinBox;
     auto *idval    = new QSpinBox;
     auto *nameval  = new QSpinBox;
+    auto *retval   = new QCheckBox;
+    auto *autoval  = new QCheckBox;
     cmdval->setRange(1, 32);
     cmdval->setValue(settings->value("command", "16").toInt());
     cmdval->setObjectName("cmdval");
@@ -524,6 +532,11 @@ EditorTab::EditorTab(QSettings *_settings, QWidget *parent) : QWidget(parent), s
     nameval->setRange(1, 32);
     nameval->setValue(settings->value("name", "8").toInt());
     nameval->setObjectName("nameval");
+    retval->setCheckState(settings->value("return", true).toBool() ? Qt::Checked : Qt::Unchecked);
+    retval->setObjectName("retval");
+    autoval->setCheckState(settings->value("automatic", true).toBool() ? Qt::Checked
+                                                                       : Qt::Unchecked);
+    autoval->setObjectName("autoval");
     settings->endGroup();
 
     int i = 0;
@@ -536,6 +549,10 @@ EditorTab::EditorTab(QSettings *_settings, QWidget *parent) : QWidget(parent), s
     grid->addWidget(idval, i++, 1, Qt::AlignTop);
     grid->addWidget(namelbl, i, 0, Qt::AlignTop);
     grid->addWidget(nameval, i++, 1, Qt::AlignTop);
+    grid->addWidget(retlbl, i, 0, Qt::AlignTop);
+    grid->addWidget(retval, i++, 1, Qt::AlignVCenter);
+    grid->addWidget(autolbl, i, 0, Qt::AlignTop);
+    grid->addWidget(autoval, i++, 1, Qt::AlignVCenter);
 
     grid->addItem(new QSpacerItem(100, 100, QSizePolicy::Minimum, QSizePolicy::Expanding), i, 0);
     grid->addItem(new QSpacerItem(100, 100, QSizePolicy::Minimum, QSizePolicy::Expanding), i, 1);