Support preserving case when replacing.

When making a case insensitive search, try to keep the string capitalization when doing
the replace:
      - All upper-case matches are replaced with the upper-case new	text.
      - All lower-case matches are replaced with the lower-case new text.
      - Capitalized matches are replace with the capitalized new text.
      - Other matches are replaced with the new text as provided.

Note: this does not work with regexp replace, only plain text.

Change-Id: I87cbc28eb64688bdf3c8c6ec173fcb22f91abcd0
Reviewed-by: Cristian Tibirna <tibirna@kde.org>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

23 files changed, 256 insertions, 32 deletions

diff --git a/doc/src/editors/creator-editors.qdoc b/doc/src/editors/creator-editors.qdoc
index cf217ae9b6..34a340e5b6 100644
--- a/doc/src/editors/creator-editors.qdoc
+++ b/doc/src/editors/creator-editors.qdoc
@@ -1172,6 +1172,28 @@
 
     \endlist
 
+    The \gui{Preserve Case when Replacing} option can be selected to preserve
+    the case of the original text when replacing. This option is not compatible
+    with the \gui {Regular Expressions} search option, and will thus be
+    disabled when regular expressions are used. When the option is used, the
+    case of the occurrence will be conserved, according to the following rules:
+
+    \list
+
+        \o All upper-case occurrences are replaced with the upper-case new text.
+
+        \o All lower-case occurrences are replaced with the lower-case new text.
+
+        \o Capitalized occurrences are replaced with the capitalized new text.
+
+        \o Other occurrences are replaced with the new text as entered.
+
+        \o If an occurrence and the new text have the same prefix or suffix,
+           then the case of the prefix and/or suffix are preserved, and the
+           other rules are applied on the rest of the occurrence only.
+
+    \endlist
+
     \section1 Advanced Search
 
     To search through projects, files on a file system or the currently open
diff --git a/src/libs/utils/filesearch.cpp b/src/libs/utils/filesearch.cpp
index 8af9484cf7..dc5692666f 100644
--- a/src/libs/utils/filesearch.cpp
+++ b/src/libs/utils/filesearch.cpp
@@ -348,6 +348,72 @@ QString Utils::expandRegExpReplacement(const QString &replaceText, const QString
     return result;
 }
 
+namespace Utils {
+namespace Internal {
+QString matchCaseReplacement(const QString &originalText, const QString &replaceText)
+{
+    //Now proceed with actual case matching
+    bool firstIsUpperCase = originalText.at(0).isUpper();
+    bool firstIsLowerCase = originalText.at(0).isLower();
+    bool restIsLowerCase = true; // to be verified
+    bool restIsUpperCase = true; // to be verified
+
+    for (int i = 1; i < originalText.length(); ++i) {
+        if (originalText.at(i).isUpper())
+            restIsLowerCase = false;
+        else if (originalText.at(i).isLower())
+            restIsUpperCase = false;
+
+        if (!restIsLowerCase && !restIsUpperCase)
+            return replaceText; // mixed
+    }
+
+    if (restIsLowerCase) {
+        QString res = replaceText.toLower();
+        if (firstIsUpperCase)
+            res.replace(0, 1, res.at(0).toUpper());
+        return res;
+    }
+
+    if (restIsUpperCase) {
+        QString res = replaceText.toUpper();
+        if (firstIsLowerCase)
+            res.replace(0, 1, res.at(0).toLower());
+        return res;
+    }
+
+    return replaceText;         // mixed
+}
+}
+}
+
+QString Utils::matchCaseReplacement(const QString &originalText, const QString &replaceText)
+{
+    if (originalText.isEmpty())
+        return replaceText;
+
+    //Find common prefix & suffix: these will be unaffected
+    const int replaceTextLen = replaceText.length();
+    const int originalTextLen = originalText.length();
+
+    int prefixLen = 0;
+    for (; prefixLen <= replaceTextLen && prefixLen <= originalTextLen; prefixLen++)
+        if (replaceText.at(prefixLen).toLower() != originalText.at(prefixLen).toLower())
+            break;
+
+    int suffixLen = 0;
+    for (; suffixLen < replaceTextLen - prefixLen && suffixLen < originalTextLen - prefixLen; suffixLen++)
+        if (replaceText.at(replaceTextLen - 1 - suffixLen).toLower() != originalText.at(originalTextLen- 1 - suffixLen).toLower())
+            break;
+
+    //keep prefix and suffix, and do actual replacement on the 'middle' of the string
+    return originalText.left(prefixLen)
+            + Internal::matchCaseReplacement(originalText.mid(prefixLen, originalTextLen - prefixLen - suffixLen),
+                                             replaceText.mid(prefixLen, replaceTextLen - prefixLen - suffixLen))
+            + originalText.right(suffixLen);
+
+}
+
 // #pragma mark -- FileIterator
 
 FileIterator::FileIterator()
diff --git a/src/libs/utils/filesearch.h b/src/libs/utils/filesearch.h
index d390c4d7c7..4a54e1860a 100644
--- a/src/libs/utils/filesearch.h
+++ b/src/libs/utils/filesearch.h
@@ -118,6 +118,7 @@ QTCREATOR_UTILS_EXPORT QFuture<FileSearchResultList> findInFilesRegExp(const QSt
     QTextDocument::FindFlags flags, QMap<QString, QString> fileToContentsMap = QMap<QString, QString>());
 
 QTCREATOR_UTILS_EXPORT QString expandRegExpReplacement(const QString &replaceText, const QStringList &capturedTexts);
+QTCREATOR_UTILS_EXPORT QString matchCaseReplacement(const QString &originalText, const QString &replaceText);
 
 } // namespace Utils
 
diff --git a/src/plugins/cpptools/cppfindreferences.cpp b/src/plugins/cpptools/cppfindreferences.cpp
index 173ed20222..c782f1a5ed 100644
--- a/src/plugins/cpptools/cppfindreferences.cpp
+++ b/src/plugins/cpptools/cppfindreferences.cpp
@@ -255,8 +255,8 @@ void CppFindReferences::findUsages(CPlusPlus::Symbol *symbol,
                                                         : Find::SearchResultWindow::SearchOnly,
                                                 QLatin1String("CppEditor"));
     search->setTextToReplace(replacement);
-    connect(search, SIGNAL(replaceButtonClicked(QString,QList<Find::SearchResultItem>)),
-            SLOT(onReplaceButtonClicked(QString,QList<Find::SearchResultItem>)));
+    connect(search, SIGNAL(replaceButtonClicked(QString,QList<Find::SearchResultItem>,bool)),
+            SLOT(onReplaceButtonClicked(QString,QList<Find::SearchResultItem>,bool)));
     connect(search, SIGNAL(paused(bool)), this, SLOT(setPaused(bool)));
     search->setSearchAgainSupported(true);
     connect(search, SIGNAL(searchAgainRequested()), this, SLOT(searchAgain()));
@@ -303,9 +303,10 @@ void CppFindReferences::findAll_helper(Find::SearchResult *search)
 }
 
 void CppFindReferences::onReplaceButtonClicked(const QString &text,
-                                               const QList<Find::SearchResultItem> &items)
+                                               const QList<Find::SearchResultItem> &items,
+                                               bool preserveCase)
 {
-    const QStringList fileNames = TextEditor::BaseFileFind::replaceAll(text, items);
+    const QStringList fileNames = TextEditor::BaseFileFind::replaceAll(text, items, preserveCase);
     if (!fileNames.isEmpty()) {
         _modelManager->updateSourceFiles(fileNames);
         Find::SearchResultWindow::instance()->hide();
diff --git a/src/plugins/cpptools/cppfindreferences.h b/src/plugins/cpptools/cppfindreferences.h
index 4f5f9e19ab..d3c979106e 100644
--- a/src/plugins/cpptools/cppfindreferences.h
+++ b/src/plugins/cpptools/cppfindreferences.h
@@ -89,7 +89,7 @@ private Q_SLOTS:
     void cancel();
     void setPaused(bool paused);
     void openEditor(const Find::SearchResultItem &item);
-    void onReplaceButtonClicked(const QString &text, const QList<Find::SearchResultItem> &items);
+    void onReplaceButtonClicked(const QString &text, const QList<Find::SearchResultItem> &items, bool preserveCase);
     void searchAgain();
 
 private:
diff --git a/src/plugins/find/basetextfind.cpp b/src/plugins/find/basetextfind.cpp
index 6f25776c4e..4f7ff89f35 100644
--- a/src/plugins/find/basetextfind.cpp
+++ b/src/plugins/find/basetextfind.cpp
@@ -124,7 +124,8 @@ bool BaseTextFind::supportsReplace() const
 Find::FindFlags BaseTextFind::supportedFindFlags() const
 {
     return Find::FindBackward | Find::FindCaseSensitively
-            | Find::FindRegularExpression | Find::FindWholeWords;
+            | Find::FindRegularExpression | Find::FindWholeWords
+            | Find::FindPreserveCase;
 }
 
 void BaseTextFind::resetIncrementalSearch()
@@ -216,12 +217,19 @@ QTextCursor BaseTextFind::replaceInternal(const QString &before, const QString &
 {
     QTextCursor cursor = textCursor();
     bool usesRegExp = (findFlags & Find::FindRegularExpression);
+    bool preserveCase = (findFlags & Find::FindPreserveCase);
     QRegExp regexp(before,
                    (findFlags & Find::FindCaseSensitively) ? Qt::CaseSensitive : Qt::CaseInsensitive,
                    usesRegExp ? QRegExp::RegExp : QRegExp::FixedString);
 
     if (regexp.exactMatch(cursor.selectedText())) {
-        QString realAfter = usesRegExp ? Utils::expandRegExpReplacement(after, regexp.capturedTexts()) : after;
+        QString realAfter;
+        if (usesRegExp)
+            realAfter = Utils::expandRegExpReplacement(after, regexp.capturedTexts());
+        else if (preserveCase)
+            realAfter = Utils::matchCaseReplacement(cursor.selectedText(), after);
+        else
+            realAfter = after;
         int start = cursor.selectionStart();
         cursor.insertText(realAfter);
         if ((findFlags&Find::FindBackward) != 0)
@@ -252,6 +260,7 @@ int BaseTextFind::replaceAll(const QString &before, const QString &after,
     editCursor.beginEditBlock();
     int count = 0;
     bool usesRegExp = (findFlags & Find::FindRegularExpression);
+    bool preserveCase = (findFlags & Find::FindPreserveCase);
     QRegExp regexp(before);
     regexp.setPatternSyntax(usesRegExp ? QRegExp::RegExp : QRegExp::FixedString);
     regexp.setCaseSensitivity((findFlags & Find::FindCaseSensitively) ? Qt::CaseSensitive : Qt::CaseInsensitive);
@@ -263,7 +272,14 @@ int BaseTextFind::replaceAll(const QString &before, const QString &after,
         editCursor.setPosition(found.selectionStart());
         editCursor.setPosition(found.selectionEnd(), QTextCursor::KeepAnchor);
         regexp.exactMatch(found.selectedText());
-        QString realAfter = usesRegExp ? Utils::expandRegExpReplacement(after, regexp.capturedTexts()) : after;
+
+        QString realAfter;
+        if (usesRegExp)
+            realAfter = Utils::expandRegExpReplacement(after, regexp.capturedTexts());
+        else if (preserveCase)
+            realAfter = Utils::matchCaseReplacement(found.selectedText(), after);
+        else
+            realAfter = after;
         editCursor.insertText(realAfter);
         found = findOne(regexp, editCursor, Find::textDocumentFlagsForFindFlags(findFlags));
     }
diff --git a/src/plugins/find/find.qrc b/src/plugins/find/find.qrc
index 52d7a810bf..0c4e128101 100644
--- a/src/plugins/find/find.qrc
+++ b/src/plugins/find/find.qrc
@@ -5,5 +5,6 @@
         <file>images/regexp.png</file>
         <file>images/expand.png</file>
         <file>images/wrapindicator.png</file>
+        <file>images/preservecase.png</file>
     </qresource>
 </RCC>
diff --git a/src/plugins/find/findplugin.cpp b/src/plugins/find/findplugin.cpp
index f24e7d36f3..63e1c0a6bf 100644
--- a/src/plugins/find/findplugin.cpp
+++ b/src/plugins/find/findplugin.cpp
@@ -270,6 +270,11 @@ void FindPlugin::setRegularExpression(bool regExp)
     setFindFlag(Find::FindRegularExpression, regExp);
 }
 
+void FindPlugin::setPreserveCase(bool preserveCase)
+{
+    setFindFlag(Find::FindPreserveCase, preserveCase);
+}
+
 void FindPlugin::setFindFlag(Find::FindFlag flag, bool enabled)
 {
     bool hasFlag = hasFindFlag(flag);
@@ -296,6 +301,7 @@ void FindPlugin::writeSettings()
     settings->setValue(QLatin1String("CaseSensitively"), hasFindFlag(Find::FindCaseSensitively));
     settings->setValue(QLatin1String("WholeWords"), hasFindFlag(Find::FindWholeWords));
     settings->setValue(QLatin1String("RegularExpression"), hasFindFlag(Find::FindRegularExpression));
+    settings->setValue(QLatin1String("PreserveCase"), hasFindFlag(Find::FindPreserveCase));
     settings->setValue(QLatin1String("FindStrings"), d->m_findCompletions);
     settings->setValue(QLatin1String("ReplaceStrings"), d->m_replaceCompletions);
     settings->endGroup();
@@ -312,6 +318,7 @@ void FindPlugin::readSettings()
     setCaseSensitive(settings->value(QLatin1String("CaseSensitively"), false).toBool());
     setWholeWord(settings->value(QLatin1String("WholeWords"), false).toBool());
     setRegularExpression(settings->value(QLatin1String("RegularExpression"), false).toBool());
+    setPreserveCase(settings->value(QLatin1String("PreserveCase"), false).toBool());
     blockSignals(block);
     d->m_findCompletions = settings->value(QLatin1String("FindStrings")).toStringList();
     d->m_replaceCompletions = settings->value(QLatin1String("ReplaceStrings")).toStringList();
diff --git a/src/plugins/find/findplugin.h b/src/plugins/find/findplugin.h
index dc80fd83f1..b4b84a3e9f 100644
--- a/src/plugins/find/findplugin.h
+++ b/src/plugins/find/findplugin.h
@@ -83,6 +83,7 @@ public slots:
     void setWholeWord(bool wholeOnly);
     void setBackward(bool backward);
     void setRegularExpression(bool regExp);
+    void setPreserveCase(bool preserveCase);
 
 signals:
     void findFlagsChanged();
diff --git a/src/plugins/find/findtoolbar.cpp b/src/plugins/find/findtoolbar.cpp
index 47a72db22f..543e92a732 100644
--- a/src/plugins/find/findtoolbar.cpp
+++ b/src/plugins/find/findtoolbar.cpp
@@ -250,6 +250,15 @@ FindToolBar::FindToolBar(FindPlugin *plugin, CurrentDocumentFind *currentDocumen
     connect(m_regularExpressionAction, SIGNAL(triggered(bool)), this, SLOT(setRegularExpressions(bool)));
     lineEditMenu->addAction(m_regularExpressionAction);
 
+    m_preserveCaseAction = new QAction(tr("Preserve Case when Replacing"), this);
+    m_preserveCaseAction->setIcon(QPixmap(QLatin1String(":/find/images/preservecase.png")));
+    m_preserveCaseAction->setCheckable(true);
+    m_preserveCaseAction->setChecked(false);
+    cmd = Core::ActionManager::registerAction(m_preserveCaseAction, Constants::PRESERVE_CASE, globalcontext);
+    mfind->addAction(cmd, Constants::G_FIND_FLAGS);
+    connect(m_preserveCaseAction, SIGNAL(triggered(bool)), this, SLOT(setPreserveCase(bool)));
+    lineEditMenu->addAction(m_preserveCaseAction);
+
     connect(m_currentDocumentFind, SIGNAL(candidateChanged()), this, SLOT(adaptToCandidate()));
     connect(m_currentDocumentFind, SIGNAL(changed()), this, SLOT(updateToolBar()));
     updateToolBar();
@@ -357,6 +366,7 @@ void FindToolBar::updateToolBar()
     m_caseSensitiveAction->setEnabled(enabled);
     m_wholeWordAction->setEnabled(enabled);
     m_regularExpressionAction->setEnabled(enabled);
+    m_preserveCaseAction->setEnabled(replaceEnabled && !hasFindFlag(Find::FindRegularExpression));
     if (QApplication::clipboard()->supportsFindBuffer())
         m_enterFindStringAction->setEnabled(enabled);
     bool replaceFocus = m_ui.replaceEdit->hasFocus();
@@ -549,7 +559,8 @@ void FindToolBar::updateIcons()
     bool casesensitive = effectiveFlags & Find::FindCaseSensitively;
     bool wholewords = effectiveFlags & Find::FindWholeWords;
     bool regexp = effectiveFlags & Find::FindRegularExpression;
-    if (!casesensitive && !wholewords && !regexp) {
+    bool preserveCase = effectiveFlags & Find::FindPreserveCase;
+    if (!casesensitive && !wholewords && !regexp && !preserveCase) {
         QPixmap pixmap(17, 17);
         pixmap.fill(Qt::transparent);
         QPainter painter(&pixmap);
@@ -565,10 +576,15 @@ void FindToolBar::updateIcons()
 Find::FindFlags FindToolBar::effectiveFindFlags()
 {
     Find::FindFlags supportedFlags;
-    if (m_currentDocumentFind->isEnabled())
+    bool supportsReplace = true;
+    if (m_currentDocumentFind->isEnabled()) {
         supportedFlags = m_currentDocumentFind->supportedFindFlags();
-    else
+        supportsReplace = m_currentDocumentFind->supportsReplace();
+    } else {
         supportedFlags = (Find::FindFlags)0xFFFFFF;
+    }
+    if (!supportsReplace || m_findFlags & Find::FindRegularExpression)
+        supportedFlags &= ~Find::FindPreserveCase;
     return supportedFlags & m_findFlags;
 }
 
@@ -577,18 +593,23 @@ void FindToolBar::updateFlagMenus()
     bool wholeOnly = ((m_findFlags & Find::FindWholeWords));
     bool sensitive = ((m_findFlags & Find::FindCaseSensitively));
     bool regexp = ((m_findFlags & Find::FindRegularExpression));
+    bool preserveCase = ((m_findFlags & Find::FindPreserveCase));
     if (m_wholeWordAction->isChecked() != wholeOnly)
         m_wholeWordAction->setChecked(wholeOnly);
     if (m_caseSensitiveAction->isChecked() != sensitive)
         m_caseSensitiveAction->setChecked(sensitive);
     if (m_regularExpressionAction->isChecked() != regexp)
         m_regularExpressionAction->setChecked(regexp);
+    if (m_preserveCaseAction->isChecked() != preserveCase)
+        m_preserveCaseAction->setChecked(preserveCase);
     Find::FindFlags supportedFlags;
     if (m_currentDocumentFind->isEnabled())
         supportedFlags = m_currentDocumentFind->supportedFindFlags();
     m_wholeWordAction->setEnabled(supportedFlags & Find::FindWholeWords);
     m_caseSensitiveAction->setEnabled(supportedFlags & Find::FindCaseSensitively);
     m_regularExpressionAction->setEnabled(supportedFlags & Find::FindRegularExpression);
+    bool replaceEnabled = m_currentDocumentFind->isEnabled() && m_currentDocumentFind->supportsReplace();
+    m_preserveCaseAction->setEnabled((supportedFlags & Find::FindPreserveCase) && !regexp && replaceEnabled);
 }
 
 bool FindToolBar::setFocusToCurrentFindSupport()
@@ -682,6 +703,7 @@ void FindToolBar::writeSettings()
     settings->setValue(QLatin1String("CaseSensitively"), QVariant((m_findFlags & Find::FindCaseSensitively) != 0));
     settings->setValue(QLatin1String("WholeWords"), QVariant((m_findFlags & Find::FindWholeWords) != 0));
     settings->setValue(QLatin1String("RegularExpression"), QVariant((m_findFlags & Find::FindRegularExpression) != 0));
+    settings->setValue(QLatin1String("PreserveCase"), QVariant((m_findFlags & Find::FindPreserveCase) != 0));
     settings->endGroup();
     settings->endGroup();
 }
@@ -700,6 +722,8 @@ void FindToolBar::readSettings()
         flags |= Find::FindWholeWords;
     if (settings->value(QLatin1String("RegularExpression"), false).toBool())
         flags |= Find::FindRegularExpression;
+    if (settings->value(QLatin1String("PreserveCase"), false).toBool())
+        flags |= Find::FindPreserveCase;
     settings->endGroup();
     settings->endGroup();
     m_findFlags = flags;
@@ -744,6 +768,11 @@ void FindToolBar::setRegularExpressions(bool regexp)
     setFindFlag(Find::FindRegularExpression, regexp);
 }
 
+void FindToolBar::setPreserveCase(bool preserveCase)
+{
+    setFindFlag(Find::FindPreserveCase, preserveCase);
+}
+
 void FindToolBar::setBackward(bool backward)
 {
     setFindFlag(Find::FindBackward, backward);
diff --git a/src/plugins/find/findtoolbar.h b/src/plugins/find/findtoolbar.h
index a53e721b39..015e15fd36 100644
--- a/src/plugins/find/findtoolbar.h
+++ b/src/plugins/find/findtoolbar.h
@@ -91,6 +91,7 @@ private slots:
     void setCaseSensitive(bool sensitive);
     void setWholeWord(bool wholeOnly);
     void setRegularExpressions(bool regexp);
+    void setPreserveCase(bool preserveCase);
 
     void adaptToCandidate();
 
@@ -132,6 +133,7 @@ private:
     QAction *m_caseSensitiveAction;
     QAction *m_wholeWordAction;
     QAction *m_regularExpressionAction;
+    QAction *m_preserveCaseAction;
     Find::FindFlags m_findFlags;
 
     QTimer m_findIncrementalTimer;
diff --git a/src/plugins/find/ifindfilter.cpp b/src/plugins/find/ifindfilter.cpp
index 9f5a778800..feda930078 100644
--- a/src/plugins/find/ifindfilter.cpp
+++ b/src/plugins/find/ifindfilter.cpp
@@ -225,13 +225,16 @@ QPixmap Find::IFindFilter::pixmapForFindFlags(Find::FindFlags flags)
     static const QPixmap casesensitiveIcon = QPixmap(QLatin1String(":/find/images/casesensitively.png"));
     static const QPixmap regexpIcon = QPixmap(QLatin1String(":/find/images/regexp.png"));
     static const QPixmap wholewordsIcon = QPixmap(QLatin1String(":/find/images/wholewords.png"));
+    static const QPixmap preservecaseIcon = QPixmap(QLatin1String(":/find/images/preservecase.png"));
     bool casesensitive = flags & Find::FindCaseSensitively;
     bool wholewords = flags & Find::FindWholeWords;
     bool regexp = flags & Find::FindRegularExpression;
+    bool preservecase = flags & Find::FindPreserveCase;
     int width = 0;
     if (casesensitive) width += 6;
     if (wholewords) width += 6;
     if (regexp) width += 6;
+    if (preservecase) width += 6;
     if (width > 0) --width;
     QPixmap pixmap(width, 17);
     pixmap.fill(Qt::transparent);
@@ -248,6 +251,10 @@ QPixmap Find::IFindFilter::pixmapForFindFlags(Find::FindFlags flags)
     }
     if (regexp) {
         painter.drawPixmap(x - 6, 0, regexpIcon);
+        x += 6;
+    }
+    if (preservecase) {
+        painter.drawPixmap(x - 6, 0, preservecaseIcon);
     }
     return pixmap;
 }
@@ -261,6 +268,8 @@ QString Find::IFindFilter::descriptionForFindFlags(Find::FindFlags flags)
         flagStrings.append(tr("Whole words"));
     if (flags & Find::FindRegularExpression)
         flagStrings.append(tr("Regular expressions"));
+    if (flags & Find::FindPreserveCase)
+        flagStrings.append(tr("Preserve case"));
     QString description = tr("Flags: %1");
     if (flagStrings.isEmpty())
         description = description.arg(tr("None"));
diff --git a/src/plugins/find/images/preservecase.png b/src/plugins/find/images/preservecase.png
new file mode 100644
index 0000000000..4869aabd71
--- /dev/null
+++ b/src/plugins/find/images/preservecase.png
diff --git a/src/plugins/find/searchresultwidget.cpp b/src/plugins/find/searchresultwidget.cpp
index e61d36c614..71b1900f83 100644
--- a/src/plugins/find/searchresultwidget.cpp
+++ b/src/plugins/find/searchresultwidget.cpp
@@ -35,6 +35,7 @@
 #include "searchresultcolor.h"
 
 #include "ifindsupport.h"
+#include "findplugin.h"
 #include "treeviewfind.h"
 
 #include <aggregation/aggregate.h>
@@ -163,6 +164,14 @@ SearchResultWidget::SearchResultWidget(QWidget *parent) :
     m_replaceButton->setText(tr("Replace"));
     m_replaceButton->setToolButtonStyle(Qt::ToolButtonTextOnly);
     m_replaceButton->setEnabled(false);
+    m_preserveCaseCheck = new QCheckBox(topWidget);
+    m_preserveCaseCheck->setText(tr("Preserve case"));
+    m_preserveCaseCheck->setEnabled(false);
+
+    if (FindPlugin * plugin = FindPlugin::instance()) {
+        m_preserveCaseCheck->setChecked(plugin->hasFindFlag(Find::FindPreserveCase));
+        connect(m_preserveCaseCheck, SIGNAL(clicked(bool)), plugin, SLOT(setPreserveCase(bool)));
+    }
 
     m_matchesFoundLabel = new QLabel(topWidget);
     updateMatchesFoundLabel();
@@ -173,6 +182,7 @@ SearchResultWidget::SearchResultWidget(QWidget *parent) :
     topLayout->addWidget(m_replaceLabel);
     topLayout->addWidget(m_replaceTextEdit);
     topLayout->addWidget(m_replaceButton);
+    topLayout->addWidget(m_preserveCaseCheck);
     topLayout->addStretch(2);
     topLayout->addWidget(m_matchesFoundLabel);
     topWidget->setMinimumHeight(m_cancelButton->sizeHint().height()
@@ -285,6 +295,7 @@ void SearchResultWidget::setShowReplaceUI(bool visible)
     m_replaceLabel->setVisible(visible);
     m_replaceTextEdit->setVisible(visible);
     m_replaceButton->setVisible(visible);
+    m_preserveCaseCheck->setVisible(visible);
     m_isShowingReplaceUI = visible;
 }
 
@@ -397,6 +408,7 @@ void SearchResultWidget::finishSearch(bool canceled)
     m_sizeWarningOverridden = false;
     m_replaceTextEdit->setEnabled(m_count > 0);
     m_replaceButton->setEnabled(m_count > 0);
+    m_preserveCaseCheck->setEnabled(m_count > 0);
     m_cancelButton->setVisible(false);
     m_messageWidget->setVisible(canceled);
     m_searchAgainButton->setVisible(m_searchAgainSupported);
@@ -441,7 +453,7 @@ void SearchResultWidget::handleReplaceButton()
     // by pressing return in replace line edit
     if (m_replaceButton->isEnabled()) {
         m_infoBar.clear();
-        emit replaceButtonClicked(m_replaceTextEdit->text(), checkedItems());
+        emit replaceButtonClicked(m_replaceTextEdit->text(), checkedItems(), m_preserveCaseCheck->isChecked());
     }
 }
 
diff --git a/src/plugins/find/searchresultwidget.h b/src/plugins/find/searchresultwidget.h
index 62c4321c93..7bdce4629c 100644
--- a/src/plugins/find/searchresultwidget.h
+++ b/src/plugins/find/searchresultwidget.h
@@ -39,6 +39,7 @@
 #include <QLineEdit>
 #include <QToolButton>
 #include <QWidget>
+#include <QCheckBox>
 
 namespace Find {
 namespace Internal {
@@ -94,7 +95,7 @@ public slots:
 
 signals:
     void activated(const Find::SearchResultItem &item);
-    void replaceButtonClicked(const QString &replaceText, const QList<Find::SearchResultItem> &checkedItems);
+    void replaceButtonClicked(const QString &replaceText, const QList<Find::SearchResultItem> &checkedItems, bool preserveCase);
     void searchAgainRequested();
     void cancelled();
     void paused(bool paused);
@@ -132,6 +133,7 @@ private:
     QLineEdit *m_replaceTextEdit;
     QToolButton *m_replaceButton;
     QToolButton *m_searchAgainButton;
+    QCheckBox *m_preserveCaseCheck;
     bool m_searchAgainSupported;
     QWidget *m_descriptionContainer;
     QLabel *m_label;
diff --git a/src/plugins/find/searchresultwindow.cpp b/src/plugins/find/searchresultwindow.cpp
index f8e89d1929..f587698af4 100644
--- a/src/plugins/find/searchresultwindow.cpp
+++ b/src/plugins/find/searchresultwindow.cpp
@@ -218,7 +218,7 @@ using namespace Find::Internal;
 */
 
 /*!
-    \fn void SearchResult::replaceButtonClicked(const QString &replaceText, const QList<Find::SearchResultItem> &checkedItems)
+    \fn void SearchResult::replaceButtonClicked(const QString &replaceText, const QList<Find::SearchResultItem> &checkedItems, bool preserveCase)
     \brief Sent when the user initiated a replace, e.g. by pressing the replace
     all button.
 
@@ -614,8 +614,8 @@ SearchResult::SearchResult(SearchResultWidget *widget)
 {
     connect(widget, SIGNAL(activated(Find::SearchResultItem)),
             this, SIGNAL(activated(Find::SearchResultItem)));
-    connect(widget, SIGNAL(replaceButtonClicked(QString,QList<Find::SearchResultItem>)),
-            this, SIGNAL(replaceButtonClicked(QString,QList<Find::SearchResultItem>)));
+    connect(widget, SIGNAL(replaceButtonClicked(QString,QList<Find::SearchResultItem>,bool)),
+            this, SIGNAL(replaceButtonClicked(QString,QList<Find::SearchResultItem>,bool)));
     connect(widget, SIGNAL(cancelled()),
             this, SIGNAL(cancelled()));
     connect(widget, SIGNAL(paused(bool)),
diff --git a/src/plugins/find/searchresultwindow.h b/src/plugins/find/searchresultwindow.h
index dc737d1391..6966c340df 100644
--- a/src/plugins/find/searchresultwindow.h
+++ b/src/plugins/find/searchresultwindow.h
@@ -110,7 +110,7 @@ public slots:
 
 signals:
     void activated(const Find::SearchResultItem &item);
-    void replaceButtonClicked(const QString &replaceText, const QList<Find::SearchResultItem> &checkedItems);
+    void replaceButtonClicked(const QString &replaceText, const QList<Find::SearchResultItem> &checkedItems, bool preserveCase);
     void cancelled();
     void paused(bool paused);
     void visibilityChanged(bool visible);
diff --git a/src/plugins/find/textfindconstants.h b/src/plugins/find/textfindconstants.h
index 1c884a1da8..533e790383 100644
--- a/src/plugins/find/textfindconstants.h
+++ b/src/plugins/find/textfindconstants.h
@@ -59,6 +59,7 @@ const char REPLACE_ALL[]       = "Find.ReplaceAll";
 const char CASE_SENSITIVE[]    = "Find.CaseSensitive";
 const char WHOLE_WORDS[]       = "Find.WholeWords";
 const char REGULAR_EXPRESSIONS[] = "Find.RegularExpressions";
+const char PRESERVE_CASE[]     = "Find.PreserveCase";
 const char TASK_SEARCH[]       = "Find.Task.Search";
 
 } // namespace Constants
@@ -67,7 +68,8 @@ enum FindFlag {
     FindBackward = 0x01,
     FindCaseSensitively = 0x02,
     FindWholeWords = 0x04,
-    FindRegularExpression = 0x08
+    FindRegularExpression = 0x08,
+    FindPreserveCase = 0x10
 };
 Q_DECLARE_FLAGS(FindFlags, FindFlag)
 
diff --git a/src/plugins/qmljseditor/qmljsfindreferences.cpp b/src/plugins/qmljseditor/qmljsfindreferences.cpp
index 48bd7b6c18..d31b1af533 100644
--- a/src/plugins/qmljseditor/qmljsfindreferences.cpp
+++ b/src/plugins/qmljseditor/qmljsfindreferences.cpp
@@ -933,8 +933,8 @@ void FindReferences::displayResults(int first, int last)
             m_currentSearch = Find::SearchResultWindow::instance()->startNewSearch(
                         label, QString(), symbolName, Find::SearchResultWindow::SearchAndReplace);
             m_currentSearch->setTextToReplace(replacement);
-            connect(m_currentSearch, SIGNAL(replaceButtonClicked(QString,QList<Find::SearchResultItem>)),
-                    SLOT(onReplaceButtonClicked(QString,QList<Find::SearchResultItem>)));
+            connect(m_currentSearch, SIGNAL(replaceButtonClicked(QString,QList<Find::SearchResultItem>,bool)),
+                    SLOT(onReplaceButtonClicked(QString,QList<Find::SearchResultItem>,bool)));
         }
         connect(m_currentSearch, SIGNAL(activated(Find::SearchResultItem)),
                 this, SLOT(openEditor(Find::SearchResultItem)));
@@ -996,9 +996,9 @@ void FindReferences::openEditor(const Find::SearchResultItem &item)
     }
 }
 
-void FindReferences::onReplaceButtonClicked(const QString &text, const QList<Find::SearchResultItem> &items)
+void FindReferences::onReplaceButtonClicked(const QString &text, const QList<Find::SearchResultItem> &items, bool preserveCase)
 {
-    const QStringList fileNames = TextEditor::BaseFileFind::replaceAll(text, items);
+    const QStringList fileNames = TextEditor::BaseFileFind::replaceAll(text, items, preserveCase);
 
     // files that are opened in an editor are changed, but not saved
     QStringList changedOnDisk;
diff --git a/src/plugins/qmljseditor/qmljsfindreferences.h b/src/plugins/qmljseditor/qmljsfindreferences.h
index 625a75bbd5..d6f6f50289 100644
--- a/src/plugins/qmljseditor/qmljsfindreferences.h
+++ b/src/plugins/qmljseditor/qmljsfindreferences.h
@@ -86,7 +86,7 @@ private Q_SLOTS:
     void cancel();
     void setPaused(bool paused);
     void openEditor(const Find::SearchResultItem &item);
-    void onReplaceButtonClicked(const QString &text, const QList<Find::SearchResultItem> &items);
+    void onReplaceButtonClicked(const QString &text, const QList<Find::SearchResultItem> &items, bool preserveCase);
 
 private:
     QPointer<Find::SearchResult> m_currentSearch;
diff --git a/src/plugins/texteditor/basefilefind.cpp b/src/plugins/texteditor/basefilefind.cpp
index ee87ea1757..bc64ea484d 100644
--- a/src/plugins/texteditor/basefilefind.cpp
+++ b/src/plugins/texteditor/basefilefind.cpp
@@ -131,8 +131,8 @@ void BaseFileFind::runNewSearch(const QString &txt, Find::FindFlags findFlags,
     search->setUserData(qVariantFromValue(parameters));
     connect(search, SIGNAL(activated(Find::SearchResultItem)), this, SLOT(openEditor(Find::SearchResultItem)));
     if (searchMode == SearchResultWindow::SearchAndReplace) {
-        connect(search, SIGNAL(replaceButtonClicked(QString,QList<Find::SearchResultItem>)),
-                this, SLOT(doReplace(QString,QList<Find::SearchResultItem>)));
+        connect(search, SIGNAL(replaceButtonClicked(QString,QList<Find::SearchResultItem>,bool)),
+                this, SLOT(doReplace(QString,QList<Find::SearchResultItem>,bool)));
     }
     connect(search, SIGNAL(visibilityChanged(bool)), this, SLOT(hideHighlightAll(bool)));
     connect(search, SIGNAL(cancelled()), this, SLOT(cancel()));
@@ -183,9 +183,10 @@ void BaseFileFind::replaceAll(const QString &txt, Find::FindFlags findFlags)
 }
 
 void BaseFileFind::doReplace(const QString &text,
-                               const QList<Find::SearchResultItem> &items)
+                             const QList<Find::SearchResultItem> &items,
+                             bool preserveCase)
 {
-    QStringList files = replaceAll(text, items);
+    QStringList files = replaceAll(text, items, preserveCase);
     if (!files.isEmpty()) {
         Core::DocumentManager::notifyFilesChangedInternally(files);
         Find::SearchResultWindow::instance()->hide();
@@ -331,7 +332,8 @@ void BaseFileFind::searchAgain()
 }
 
 QStringList BaseFileFind::replaceAll(const QString &text,
-                               const QList<Find::SearchResultItem> &items)
+                                     const QList<Find::SearchResultItem> &items,
+                                     bool preserveCase)
 {
     if (items.isEmpty())
         return QStringList();
@@ -358,10 +360,15 @@ QStringList BaseFileFind::replaceAll(const QString &text,
             processed.insert(p);
 
             QString replacement;
-            if (item.userData.canConvert<QStringList>() && !item.userData.toStringList().isEmpty())
+            if (item.userData.canConvert<QStringList>() && !item.userData.toStringList().isEmpty()) {
                 replacement = Utils::expandRegExpReplacement(text, item.userData.toStringList());
-            else
+            } else if (preserveCase) {
+                const QString originalText = (item.textMarkLength == 0) ? item.text
+                                                                        : item.text.mid(item.textMarkPos, item.textMarkLength);
+                replacement = Utils::matchCaseReplacement(originalText, text);
+            } else {
                 replacement = text;
+            }
 
             const int start = file->position(item.lineNumber, item.textMarkPos + 1);
             const int end = file->position(item.lineNumber,
diff --git a/src/plugins/texteditor/basefilefind.h b/src/plugins/texteditor/basefilefind.h
index e7451f5bd8..c4d78d72f9 100644
--- a/src/plugins/texteditor/basefilefind.h
+++ b/src/plugins/texteditor/basefilefind.h
@@ -71,7 +71,8 @@ public:
 
     /* returns the list of unique files that were passed in items */
     static QStringList replaceAll(const QString &txt,
-                                  const QList<Find::SearchResultItem> &items);
+                                  const QList<Find::SearchResultItem> &items,
+                                  bool preserveCase = false);
 
 protected:
     virtual Utils::FileIterator *files(const QStringList &nameFilters,
@@ -95,7 +96,8 @@ private slots:
     void setPaused(bool paused);
     void openEditor(const Find::SearchResultItem &item);
     void doReplace(const QString &txt,
-                    const QList<Find::SearchResultItem> &items);
+                   const QList<Find::SearchResultItem> &items,
+                   bool preserveCase);
     void hideHighlightAll(bool visible);
     void searchAgain();
 
diff --git a/tests/auto/filesearch/tst_filesearch.cpp b/tests/auto/filesearch/tst_filesearch.cpp
index c610d6c5a9..a2d1d47882 100644
--- a/tests/auto/filesearch/tst_filesearch.cpp
+++ b/tests/auto/filesearch/tst_filesearch.cpp
@@ -51,6 +51,7 @@ private slots:
     void multipleResults();
     void caseSensitive();
     void caseInSensitive();
+    void matchCaseReplacement();
 };
 
 namespace {
@@ -99,6 +100,49 @@ void tst_FileSearch::caseInSensitive()
     test_helper(expectedResults, QLatin1String("CaseSensitive"), QTextDocument::FindFlags(0));
 }
 
+void tst_FileSearch::matchCaseReplacement()
+{
+    QCOMPARE(Utils::matchCaseReplacement("", "foobar"), QString("foobar"));          //empty string
+
+    QCOMPARE(Utils::matchCaseReplacement("testpad", "foobar"), QString("foobar"));   //lower case
+    QCOMPARE(Utils::matchCaseReplacement("TESTPAD", "foobar"), QString("FOOBAR"));   //upper case
+    QCOMPARE(Utils::matchCaseReplacement("Testpad", "foobar"), QString("Foobar"));   //capitalized
+    QCOMPARE(Utils::matchCaseReplacement("tESTPAD", "foobar"), QString("fOOBAR"));   //un-capitalized
+    QCOMPARE(Utils::matchCaseReplacement("tEsTpAd", "foobar"), QString("foobar"));   //mixed case, use replacement as specified
+    QCOMPARE(Utils::matchCaseReplacement("TeStPaD", "foobar"), QString("foobar"));   //mixed case, use replacement as specified
+
+    QCOMPARE(Utils::matchCaseReplacement("testpad", "fooBar"), QString("foobar"));   //lower case
+    QCOMPARE(Utils::matchCaseReplacement("TESTPAD", "fooBar"), QString("FOOBAR"));   //upper case
+    QCOMPARE(Utils::matchCaseReplacement("Testpad", "fooBar"), QString("Foobar"));   //capitalized
+    QCOMPARE(Utils::matchCaseReplacement("tESTPAD", "fooBar"), QString("fOOBAR"));   //un-capitalized
+    QCOMPARE(Utils::matchCaseReplacement("tEsTpAd", "fooBar"), QString("fooBar"));   //mixed case, use replacement as specified
+    QCOMPARE(Utils::matchCaseReplacement("TeStPaD", "fooBar"), QString("fooBar"));   //mixed case, use replacement as specified
+
+    //with common prefix
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXtestpad", "prefixfoobar"), QString("pReFiXfoobar"));   //lower case
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXTESTPAD", "prefixfoobar"), QString("pReFiXFOOBAR"));   //upper case
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXTestpad", "prefixfoobar"), QString("pReFiXFoobar"));   //capitalized
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXtESTPAD", "prefixfoobar"), QString("pReFiXfOOBAR"));   //un-capitalized
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXtEsTpAd", "prefixfoobar"), QString("pReFiXfoobar"));   //mixed case, use replacement as specified
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXTeStPaD", "prefixfoobar"), QString("pReFiXfoobar"));   //mixed case, use replacement as specified
+
+    //with common suffix
+    QCOMPARE(Utils::matchCaseReplacement("testpadSuFfIx", "foobarsuffix"), QString("foobarSuFfIx"));   //lower case
+    QCOMPARE(Utils::matchCaseReplacement("TESTPADSuFfIx", "foobarsuffix"), QString("FOOBARSuFfIx"));   //upper case
+    QCOMPARE(Utils::matchCaseReplacement("TestpadSuFfIx", "foobarsuffix"), QString("FoobarSuFfIx"));   //capitalized
+    QCOMPARE(Utils::matchCaseReplacement("tESTPADSuFfIx", "foobarsuffix"), QString("fOOBARSuFfIx"));   //un-capitalized
+    QCOMPARE(Utils::matchCaseReplacement("tEsTpAdSuFfIx", "foobarsuffix"), QString("foobarSuFfIx"));   //mixed case, use replacement as specified
+    QCOMPARE(Utils::matchCaseReplacement("TeStPaDSuFfIx", "foobarsuffix"), QString("foobarSuFfIx"));   //mixed case, use replacement as specified
+
+    //with common prefix and suffix
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXtestpadSuFfIx", "prefixfoobarsuffix"), QString("pReFiXfoobarSuFfIx"));   //lower case
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXTESTPADSuFfIx", "prefixfoobarsuffix"), QString("pReFiXFOOBARSuFfIx"));   //upper case
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXTestpadSuFfIx", "prefixfoobarsuffix"), QString("pReFiXFoobarSuFfIx"));   //capitalized
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXtESTPADSuFfIx", "prefixfoobarsuffix"), QString("pReFiXfOOBARSuFfIx"));   //un-capitalized
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXtEsTpAdSuFfIx", "prefixfoobarsuffix"), QString("pReFiXfoobarSuFfIx"));   //mixed case, use replacement as specified
+    QCOMPARE(Utils::matchCaseReplacement("pReFiXTeStPaDSuFfIx", "prefixfoobarsuffix"), QString("pReFiXfoobarSuFfIx"));   //mixed case, use replacement as specified
+}
+
 QTEST_MAIN(tst_FileSearch)
 
 #include "tst_filesearch.moc"