Git: Move GitSubmitHighlighter to header

And change it to derive TextEditor::SyntaxHighlighter

Required for reusing for a BaseTextDocument

Change-Id: I034b76e03e447bcc47f11833367f7bba9cc031c1
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/git/gitsubmiteditorwidget.h

@@ -33,8 +33,12 @@
 #include "ui_gitsubmitpanel.h"
 #include "gitsettings.h"
 
+#include <texteditor/syntaxhighlighter.h>
 #include <vcsbase/submiteditorwidget.h>
 
+#include <QRegExp>
+#include <QSyntaxHighlighter>
+
 QT_BEGIN_NAMESPACE
 class QValidator;
 QT_END_NAMESPACE
@@ -89,6 +93,25 @@ private:
     bool m_isInitialized;
 };
 
+// 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 : public TextEditor::SyntaxHighlighter
+{
+public:
+    explicit GitSubmitHighlighter(QTextEdit *parent);
+    explicit GitSubmitHighlighter(TextEditor::BaseTextDocument *parent);
+    void highlightBlock(const QString &text);
+
+    void initialize();
+private:
+    enum State { None = -1, Header, Other };
+    QTextCharFormat m_commentFormat;
+    QRegExp m_keywordPattern;
+    QChar m_hashChar;
+};
+
 } // namespace Internal
 } // namespace Git