Submit editor: Use config font settings, add simple highlighting for git

src/plugins/git/gitsubmiteditorwidget.cpp

@@ -30,15 +30,92 @@
 #include "gitsubmiteditorwidget.h"
 #include "commitdata.h"
 
+#include <texteditor/texteditorsettings.h>
+#include <texteditor/fontsettings.h>
+#include <texteditor/texteditorconstants.h>
+
+#include <QtGui/QSyntaxHighlighter>
+#include <QtGui/QTextEdit>
+
+#include <QtCore/QDebug>
+#include <QtCore/QRegExp>
+
 namespace Git {
 namespace Internal {
 
+// Retrieve the comment char format from the text editor.
+static QTextCharFormat commentFormat()
+{
+    const TextEditor::FontSettings settings = TextEditor::TextEditorSettings::instance()->fontSettings();
+    return settings.toTextCharFormat(QLatin1String(TextEditor::Constants::C_COMMENT));
+}
+
+// Highlighter for git submit messages. Make the first line bold, indicates
+// comments as such (retrieving the format from the text editor) and marks up
+// keywords (words in front of a colon as in 'Task: <bla>').
+
+class GitSubmitHighlighter : QSyntaxHighlighter {
+public:    
+    explicit GitSubmitHighlighter(QTextEdit *parent);
+    virtual void highlightBlock(const QString &text);
+
+private:
+    enum State { Header, Comment, Other };
+    const QTextCharFormat m_commentFormat;    
+    const QRegExp m_keywordPattern;
+    const QChar m_hashChar;
+};
+
+GitSubmitHighlighter::GitSubmitHighlighter(QTextEdit * parent) :
+    QSyntaxHighlighter(parent),
+    m_commentFormat(commentFormat()),
+    m_keywordPattern(QLatin1String("^\\w+:")),
+    m_hashChar(QLatin1Char('#'))
+{
+    Q_ASSERT(m_keywordPattern.isValid());
+}
+
+void GitSubmitHighlighter::highlightBlock(const QString &text)
+{
+    // figure out current state
+    State state = Other;
+    const QTextBlock block = currentBlock();
+    if (block.position() == 0) {
+        state = Header;
+    } else {
+        if (text.startsWith(m_hashChar))
+            state = Comment;
+    }
+    // Apply format.
+    switch (state) {        
+    case Header: {
+            QTextCharFormat charFormat = format(0);
+            charFormat.setFontWeight(QFont::Bold);
+            setFormat(0, text.size(), charFormat);
+    }
+        break;
+    case Comment:
+        setFormat(0, text.size(), m_commentFormat);
+        break;
+    case Other:
+        // Format key words ("Task:") italic
+        if (m_keywordPattern.indexIn(text, 0, QRegExp::CaretAtZero) == 0) {
+            QTextCharFormat charFormat = format(0);
+            charFormat.setFontItalic(true);
+            setFormat(0, m_keywordPattern.matchedLength(), charFormat);
+        }
+        break;
+    }
+}
+
+// ------------------
 GitSubmitEditorWidget::GitSubmitEditorWidget(QWidget *parent) :
     Core::Utils::SubmitEditorWidget(parent),
     m_gitSubmitPanel(new QWidget)
 {
     m_gitSubmitPanelUi.setupUi(m_gitSubmitPanel);
     insertTopWidget(m_gitSubmitPanel);
+    new GitSubmitHighlighter(descriptionEdit());
 }
 
 void GitSubmitEditorWidget::setPanelInfo(const GitSubmitEditorPanelInfo &info)