Git: Move submit highlighter to a separate file

Change-Id: I61e07b2abe3b1da1b56935bb3ce528a5f571705f
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/git/githighlighters.cpp

@@ -0,0 +1,108 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include <texteditor/fontsettings.h>
+#include <texteditor/texteditorconstants.h>
+#include <texteditor/texteditorsettings.h>
+
+#include <utils/qtcassert.h>
+
+#include "githighlighters.h"
+
+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(TextEditor::C_COMMENT);
+}
+
+GitSubmitHighlighter::GitSubmitHighlighter(QTextEdit * parent) :
+    TextEditor::SyntaxHighlighter(parent)
+{
+    initialize();
+}
+
+GitSubmitHighlighter::GitSubmitHighlighter(TextEditor::BaseTextDocument *parent) :
+    TextEditor::SyntaxHighlighter(parent)
+{
+    initialize();
+}
+
+void GitSubmitHighlighter::initialize()
+{
+    m_commentFormat = commentFormat();
+    m_keywordPattern.setPattern(QLatin1String("^[\\w-]+:"));
+    m_hashChar = QLatin1Char('#');
+    QTC_CHECK(m_keywordPattern.isValid());
+}
+
+void GitSubmitHighlighter::highlightBlock(const QString &text)
+{
+    // figure out current state
+    State state = static_cast<State>(previousBlockState());
+    if (text.isEmpty()) {
+        if (state == Header)
+            state = Other;
+        setCurrentBlockState(state);
+        return;
+    } else if (text.startsWith(m_hashChar)) {
+        setFormat(0, text.size(), m_commentFormat);
+        setCurrentBlockState(state);
+        return;
+    } else if (state == None) {
+        state = Header;
+    }
+
+    setCurrentBlockState(state);
+    // Apply format.
+    switch (state) {
+    case None:
+        break;
+    case Header: {
+        QTextCharFormat charFormat = format(0);
+        charFormat.setFontWeight(QFont::Bold);
+        setFormat(0, text.size(), charFormat);
+        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;
+    }
+}
+
+} // namespace Internal
+} // namespace Git