Git: Enable Show for file in a specified revision

Fixes: QTCREATORBUG-24689
Change-Id: Ic4ceb1c59f39009c28be7f34ee62f65fd41506c1
Reviewed-by: André Hartmann <aha_1980@gmx.de>

src/plugins/git/gitclient.cpp

@@ -3714,9 +3714,10 @@ QString GitClient::suggestedLocalBranchName(
     return suggestedName;
 }
 
-void GitClient::addChangeActions(QMenu *menu, const QString &workingDir, const QString &change)
+void GitClient::addChangeActions(QMenu *menu, const QString &source, const QString &change)
 {
     QTC_ASSERT(!change.isEmpty(), return);
+    const QString &workingDir = fileWorkingDirectory(source);
     menu->addAction(tr("Cherr&y-Pick Change %1").arg(change), [workingDir, change] {
         m_instance->synchronousCherryPick(workingDir, change);
     });
@@ -3733,6 +3734,13 @@ void GitClient::addChangeActions(QMenu *menu, const QString &workingDir, const Q
     QAction *logAction = menu->addAction(tr("&Log for Change %1").arg(change), [workingDir, change] {
         m_instance->log(workingDir, QString(), false, {change});
     });
+    const FilePath filePath = FilePath::fromString(source);
+    if (!filePath.isDir()) {
+        menu->addAction(tr("Sh&ow file \"%1\" on revision %2").arg(filePath.fileName()).arg(change),
+                        [workingDir, change, source] {
+            m_instance->openShowEditor(workingDir, change, source);
+        });
+    }
     if (change.contains(".."))
         menu->setDefaultAction(logAction);
     menu->addAction(tr("Add &Tag for Change %1...").arg(change), [workingDir, change] {
@@ -3781,6 +3789,45 @@ void GitClient::addChangeActions(QMenu *menu, const QString &workingDir, const Q
     });
 }
 
+QString GitClient::fileWorkingDirectory(const QString &file)
+{
+    Utils::FilePath path = Utils::FilePath::fromString(file);
+    if (!path.isEmpty() && !path.isDir())
+        path = path.parentDir();
+    while (!path.isEmpty() && !path.exists())
+        path = path.parentDir();
+    return path.toString();
+}
+
+IEditor *GitClient::openShowEditor(const QString &workingDirectory, const QString &ref,
+                                   const QString &path, ShowEditor showSetting)
+{
+    QString topLevel;
+    VcsManager::findVersionControlForDirectory(workingDirectory, &topLevel);
+    const QString relativePath = QDir(topLevel).relativeFilePath(path);
+    const QByteArray content = synchronousShow(topLevel, ref + ":" + relativePath);
+    if (showSetting == ShowEditor::OnlyIfDifferent) {
+        if (content.isEmpty())
+            return nullptr;
+        QByteArray fileContent;
+        if (TextFileFormat::readFileUTF8(path, nullptr, &fileContent, nullptr)
+                == TextFileFormat::ReadSuccess) {
+            if (fileContent == content)
+                return nullptr; // open the file for read/write
+        }
+    }
+
+    const QString documentId = QLatin1String(Git::Constants::GIT_PLUGIN)
+            + QLatin1String(".GitShow.") + topLevel
+            + QLatin1String(".") + relativePath;
+    QString title = tr("Git Show %1:%2").arg(ref).arg(relativePath);
+    IEditor *editor = EditorManager::openEditorWithContents(Id(), &title, content, documentId,
+                                                            EditorManager::DoNotSwitchToDesignMode);
+    editor->document()->setTemporary(true);
+    VcsBase::setSource(editor->document(), path);
+    return editor;
+}
+
 } // namespace Internal
 } // namespace Git
 

src/plugins/git/gitclient.h

@@ -366,7 +366,11 @@ public:
     static QString suggestedLocalBranchName(
             const QString &workingDirectory, const QStringList &existingLocalNames,
             const QString &target, BranchTargetType targetType);
-    static void addChangeActions(QMenu *menu, const QString &workingDir, const QString &change);
+    static void addChangeActions(QMenu *menu, const QString &source, const QString &change);
+    static QString fileWorkingDirectory(const QString &file);
+    enum class ShowEditor { OnlyIfDifferent, Always };
+    Core::IEditor *openShowEditor(const QString &workingDirectory, const QString &ref,
+                                  const QString &path, ShowEditor showSetting = ShowEditor::Always);
 
 private:
     void finishSubmoduleUpdate();

src/plugins/git/giteditor.cpp

@@ -325,7 +325,7 @@ bool GitEditorWidget::isValidRevision(const QString &revision) const
 void GitEditorWidget::addChangeActions(QMenu *menu, const QString &change)
 {
     if (contentType() != OtherContent)
-        GitClient::addChangeActions(menu, sourceWorkingDirectory(), change);
+        GitClient::addChangeActions(menu, source(), change);
 }
 
 QString GitEditorWidget::revisionSubject(const QTextBlock &inBlock) const
@@ -364,12 +364,7 @@ QString GitEditorWidget::fileNameForLine(int line) const
 
 QString GitEditorWidget::sourceWorkingDirectory() const
 {
-    Utils::FilePath path = Utils::FilePath::fromString(source());
-    if (!path.isEmpty() && !path.isDir())
-        path = path.parentDir();
-    while (!path.isEmpty() && !path.exists())
-        path = path.parentDir();
-    return path.toString();
+    return GitClient::fileWorkingDirectory(source());
 }
 
 void GitEditorWidget::refresh()

src/plugins/git/gitgrep.cpp

@@ -316,25 +316,9 @@ IEditor *GitGrep::openEditor(const SearchResultItem &item,
         return nullptr;
     const QString path = QDir::fromNativeSeparators(item.path.first());
     const QString topLevel = parameters.additionalParameters.toString();
-    const QString relativePath = QDir(topLevel).relativeFilePath(path);
-    const QByteArray content = m_client->synchronousShow(topLevel, params.ref + ":./" + relativePath);
-    if (content.isEmpty())
-        return nullptr;
-    QByteArray fileContent;
-    if (TextFileFormat::readFileUTF8(path, nullptr, &fileContent, nullptr)
-            == TextFileFormat::ReadSuccess) {
-        if (fileContent == content)
-            return nullptr; // open the file for read/write
-    }
-
-    const QString documentId = QLatin1String(Git::Constants::GIT_PLUGIN)
-            + QLatin1String(".GitShow.") + params.id()
-            + QLatin1String(".") + relativePath;
-    QString title = tr("Git Show %1:%2").arg(params.ref).arg(relativePath);
-    IEditor *editor = EditorManager::openEditorWithContents(Id(), &title, content, documentId,
-                                                            EditorManager::DoNotSwitchToDesignMode);
+    IEditor *editor = m_client->openShowEditor(
+                topLevel, params.ref, path, GitClient::ShowEditor::OnlyIfDifferent);
     editor->gotoLine(item.mainRange.begin.line, item.mainRange.begin.column);
-    editor->document()->setTemporary(true);
     return editor;
 }
 

src/plugins/git/gitplugin.cpp

@@ -1220,7 +1220,13 @@ void GitPluginPrivate::startChangeRelatedAction(const Id &id)
         return;
 
     if (dialog.command() == Show) {
-        m_gitClient.show(workingDirectory, change);
+        const int colon = change.indexOf(':');
+        if (colon > 0) {
+            const QString path = QDir(workingDirectory).absoluteFilePath(change.mid(colon + 1));
+            m_gitClient.openShowEditor(workingDirectory, change.left(colon), path);
+        } else {
+            m_gitClient.show(workingDirectory, change);
+        }
         return;
     }