file viewer can be called from File menu or context menu in editor if word under cursor is a file

tools/lammps-gui/codeeditor.cpp

@@ -12,6 +12,7 @@
 ------------------------------------------------------------------------- */
 
 #include "codeeditor.h"
+#include "fileviewer.h"
 #include "lammpsgui.h"
 #include "linenumberarea.h"
 
@@ -33,6 +34,7 @@
 #include <QSettings>
 #include <QShortcut>
 #include <QStringListModel>
+#include <QStringRef>
 #include <QTextBlock>
 #include <QTextDocumentFragment>
 #include <QUrl>
@@ -574,7 +576,7 @@ void CodeEditor::keyPressEvent(QKeyEvent *event)
         auto line   = cursor.block().text();
         if (line.isEmpty()) return;
 
-        // QTextCursor::WordUnderCursor is unusable here since recognizes '/' as word boundary.
+        // QTextCursor::WordUnderCursor is unusable here since it recognizes '/' as word boundary.
         // Work around it by manually searching for the location of the beginning of the word.
         int begin = qMin(cursor.positionInBlock(), line.length() - 1);
 
@@ -736,6 +738,38 @@ void CodeEditor::contextMenuEvent(QContextMenuEvent *event)
             connect(action2, &QAction::triggered, this, &CodeEditor::open_help);
         }
     }
+
+    // check if word under cursor is file
+    {
+        auto cursor = textCursor();
+        auto line   = cursor.block().text();
+        if (!line.isEmpty()) {
+            // QTextCursor::WordUnderCursor is unusable here since it recognizes '/' as word
+            // boundary. Work around it by manually searching for the location of the beginning of
+            // the word.
+            int begin = qMin(cursor.positionInBlock(), line.length() - 1);
+
+            while (begin >= 0) {
+                if (line[begin].isSpace()) break;
+                --begin;
+            }
+            int end = begin + 1;
+            while (end < line.length()) {
+                if (line[end].isSpace()) break;
+                ++end;
+            }
+
+            QString word = line.mid(begin, end - begin).trimmed();
+            QFileInfo fi(word);
+            if (fi.exists() && fi.isFile()) {
+                auto *action = menu->addAction(QString("View file '%1'").arg(word));
+                action->setIcon(QIcon(":/icons/document-open.png"));
+                action->setData(word);
+                connect(action, &QAction::triggered, this, &CodeEditor::view_file);
+            }
+        }
+    }
+
     auto *action = menu->addAction(QString("LAMMPS Manual"));
     action->setIcon(QIcon(":/icons/help-browser.png"));
     action->setData(QString());
@@ -1091,7 +1125,7 @@ void CodeEditor::insertCompletedCommand(const QString &completion)
     if (completer->widget() != this) return;
 
     // select the entire word (non-space text) under the cursor
-    // we need to do it in this compicated way, since QTextCursor does not recognize
+    // we need to do it in this complicated way, since QTextCursor does not recognize
     // special characters as part of a word.
     auto cursor = textCursor();
     auto line   = cursor.block().text();
@@ -1174,6 +1208,13 @@ void CodeEditor::open_help()
         QUrl(QString("https://docs.lammps.org/%1").arg(act->data().toString())));
 }
 
+void CodeEditor::view_file()
+{
+    auto *act    = qobject_cast<QAction *>(sender());
+    auto *viewer = new FileViewer(act->data().toString());
+    viewer->show();
+}
+
 // Local Variables:
 // c-basic-offset: 4
 // End:

tools/lammps-gui/codeeditor.h

@@ -78,6 +78,7 @@ private slots:
     void get_help();
     void find_help(QString &page, QString &help);
     void open_help();
+    void view_file();
     void reformatCurrentLine();
     void runCompletion();
     void insertCompletedCommand(const QString &completion);

tools/lammps-gui/lammpsgui.cpp

@@ -14,6 +14,7 @@
 #include "lammpsgui.h"
 
 #include "chartviewer.h"
+#include "fileviewer.h"
 #include "helpers.h"
 #include "highlighter.h"
 #include "imageviewer.h"
@@ -193,6 +194,7 @@ LammpsGui::LammpsGui(QWidget *parent, const char *filename) :
     connect(ui->actionOpen, &QAction::triggered, this, &LammpsGui::open);
     connect(ui->actionSave, &QAction::triggered, this, &LammpsGui::save);
     connect(ui->actionSave_As, &QAction::triggered, this, &LammpsGui::save_as);
+    connect(ui->actionView, &QAction::triggered, this, &LammpsGui::view);
     connect(ui->actionQuit, &QAction::triggered, this, &LammpsGui::quit);
     connect(ui->actionCopy, &QAction::triggered, this, &LammpsGui::copy);
     connect(ui->actionCut, &QAction::triggered, this, &LammpsGui::cut);
@@ -394,6 +396,12 @@ void LammpsGui::open()
     open_file(fileName);
 }
 
+void LammpsGui::view()
+{
+    QString fileName = QFileDialog::getOpenFileName(this, "Open the file");
+    view_file(fileName);
+}
+
 void LammpsGui::open_recent()
 {
     auto *act = qobject_cast<QAction *>(sender());
@@ -640,6 +648,20 @@ void LammpsGui::open_file(const QString &fileName)
     lammps.close();
 }
 
+// open file in read-only mode for viewing in separate window
+void LammpsGui::view_file(const QString &fileName)
+{
+    QFile file(fileName);
+    if (!file.open(QIODevice::ReadOnly | QFile::Text)) {
+        QMessageBox::warning(this, "Warning",
+                             "Cannot open file " + fileName + ": " + file.errorString() + ".\n");
+    } else {
+        file.close();
+        auto *viewer = new FileViewer(fileName);
+        viewer->show();
+    }
+}
+
 // write file and update CWD to its folder
 
 void LammpsGui::write_file(const QString &fileName)

tools/lammps-gui/lammpsgui.h

@@ -61,6 +61,7 @@ public:
 
 protected:
     void open_file(const QString &filename);
+    void view_file(const QString &filename);
     void write_file(const QString &filename);
     void update_recents(const QString &filename = "");
     void update_variables();
@@ -75,6 +76,7 @@ public slots:
 private slots:
     void new_document();
     void open();
+    void view();
     void open_recent();
     void start_exe();
     void save();

tools/lammps-gui/lammpsgui.ui

@@ -37,6 +37,7 @@
     <addaction name="actionNew"/>
     <addaction name="separator"/>
     <addaction name="actionOpen"/>
+    <addaction name="actionView"/>
     <addaction name="separator"/>
     <addaction name="action_1"/>
     <addaction name="action_2"/>
@@ -125,6 +126,17 @@
     <string>Ctrl+O</string>
    </property>
   </action>
+  <action name="actionView">
+   <property name="icon">
+    <iconset theme=":/icons/document-open.png"/>
+   </property>
+   <property name="text">
+    <string>&amp;View</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+Shift+F</string>
+   </property>
+  </action>
   <action name="actionSave">
    <property name="icon">
     <iconset theme=":/icons/document-save.png"/>