DiffEditorController: Add an option to set a syntax highlighter

Change-Id: I66fc252e7ccc168fd32ed7100cc9af7f940dc3e0
Reviewed-by: André Hartmann <aha_1980@gmx.de>

src/plugins/diffeditor/diffeditor.cpp

@@ -146,6 +146,7 @@ private:
     void documentHasChanged();
     void toggleDescription();
     void updateDescription();
+    void updateDescriptionHighlighter();
     void contextLineCountHasChanged(int lines);
     void ignoreWhitespaceHasChanged();
     void prepareForReload();
@@ -298,6 +299,8 @@ void DiffEditor::setDocument(std::shared_ptr<DiffEditorDocument> doc)
             this, &DiffEditor::documentHasChanged);
     connect(m_document.get(), &DiffEditorDocument::descriptionChanged,
             this, &DiffEditor::updateDescription);
+    connect(m_document.get(), &DiffEditorDocument::descriptionHighlighterChanged,
+            this, &DiffEditor::updateDescriptionHighlighter);
     connect(m_document.get(), &DiffEditorDocument::aboutToReload,
             this, &DiffEditor::prepareForReload);
     connect(m_document.get(), &DiffEditorDocument::reloadFinished,
@@ -451,6 +454,13 @@ void DiffEditor::updateDescription()
     m_toggleDescriptionAction->setVisible(!description.isEmpty());
 }
 
+void DiffEditor::updateDescriptionHighlighter()
+{
+    const auto creator = m_document->descriptionSyntaxHighlighterCreator();
+    if (creator)
+        m_descriptionWidget->textDocument()->resetSyntaxHighlighter(creator);
+}
+
 void DiffEditor::contextLineCountHasChanged(int lines)
 {
     QTC_ASSERT(!m_document->isContextLineCountForced(), return);

src/plugins/diffeditor/diffeditorcontroller.cpp

@@ -87,6 +87,12 @@ void DiffEditorController::setDescription(const QString &description)
     m_document->setDescription(description);
 }
 
+void DiffEditorController::setDescriptionSyntaxHighlighterCreator(
+    const std::function<TextEditor::SyntaxHighlighter *()> &creator)
+{
+    m_document->setDescriptionSyntaxHighlighterCreator(creator);
+}
+
 /**
  * @brief Force the lines of context to the given number.
  *

src/plugins/diffeditor/diffeditorcontroller.h

@@ -16,6 +16,7 @@ class QMenu;
 QT_END_NAMESPACE
 
 namespace Core { class IDocument; }
+namespace TextEditor { class SyntaxHighlighter; }
 namespace Utils { class FilePath; }
 
 namespace DiffEditor {
@@ -63,6 +64,8 @@ protected:
     // Optional:
     void setDisplayName(const QString &name) { m_displayName = name; }
     void setDescription(const QString &description);
+    void setDescriptionSyntaxHighlighterCreator(
+        const std::function<TextEditor::SyntaxHighlighter *()> &creator);
     void setStartupFile(const QString &startupFile);
     void forceContextLineCount(int lines);
 

src/plugins/diffeditor/diffeditordocument.cpp

@@ -179,6 +179,13 @@ void DiffEditorDocument::setDescription(const QString &description)
     emit descriptionChanged();
 }
 
+void DiffEditorDocument::setDescriptionSyntaxHighlighterCreator(
+    const std::function<TextEditor::SyntaxHighlighter *()> &creator)
+{
+    m_descriptionHighlighter = creator;
+    emit descriptionHighlighterChanged();
+}
+
 QString DiffEditorDocument::description() const
 {
     return m_description;

src/plugins/diffeditor/diffeditordocument.h

@@ -8,6 +8,8 @@
 #include <coreplugin/patchtool.h>
 #include <coreplugin/textdocument.h>
 
+namespace TextEditor { class SyntaxHighlighter; }
+
 namespace DiffEditor {
 
 class DiffEditorController;
@@ -45,6 +47,11 @@ public:
 
     void setDescription(const QString &description);
     QString description() const;
+    void setDescriptionSyntaxHighlighterCreator(
+        const std::function<TextEditor::SyntaxHighlighter *()> &creator);
+    std::function<TextEditor::SyntaxHighlighter *()> descriptionSyntaxHighlighterCreator() const {
+        return m_descriptionHighlighter;
+    }
 
     void setContextLineCount(int lines);
     int contextLineCount() const;
@@ -71,6 +78,7 @@ signals:
     void temporaryStateChanged();
     void documentChanged();
     void descriptionChanged();
+    void descriptionHighlighterChanged();
 
 protected:
     bool saveImpl(QString *errorString, const Utils::FilePath &filePath, bool autoSave) override;
@@ -85,6 +93,7 @@ private:
     Utils::FilePath m_workingDirectory;
     QString m_startupFile;
     QString m_description;
+    std::function<TextEditor::SyntaxHighlighter *()> m_descriptionHighlighter = {};
     int m_contextLineCount = 3;
     bool m_isContextLineCountForced = false;
     bool m_ignoreWhitespace = false;