Git: Support change links on commit editor

Useful for commit messages with "reverts <hash>" for example.

Can later be extended for interactive rebase

Change-Id: Ibf77433ecddfacbd8d443636ddbc406bda474aa7
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/git/gitclient.cpp

@@ -794,6 +794,19 @@ QString GitClient::findGitDirForRepository(const QString &repositoryDir) const
     return res;
 }
 
+QString GitClient::findRepositoryForGitDir(const QString &gitDir) const
+{
+    static QHash<QString, QString> gitDirCache;
+    QString &res = gitDirCache[gitDir];
+    if (!res.isEmpty())
+        return res;
+    QByteArray outputText;
+    QStringList arguments;
+    arguments << QLatin1String("rev-parse") << QLatin1String("--show-toplevel");
+    fullySynchronousGit(gitDir, arguments, &outputText, 0, false);
+    return QString::fromLocal8Bit(outputText.trimmed());
+}
+
 VcsBase::VcsBaseEditorWidget *GitClient::findExistingVCSEditor(const char *registerDynamicProperty,
                                                                const QString &dynamicPropertyValue) const
 {

src/plugins/git/gitclient.h

@@ -138,6 +138,7 @@ public:
 
     QString findRepositoryForDirectory(const QString &dir);
     QString findGitDirForRepository(const QString &repositoryDir) const;
+    QString findRepositoryForGitDir(const QString &gitDir) const;
 
     void diff(const QString &workingDirectory, const QStringList &diffArgs, const QString &fileName);
     void diff(const QString &workingDirectory, const QStringList &diffArgs,

src/plugins/git/giteditor.cpp

@@ -235,6 +235,16 @@ void GitEditor::init()
         new GitSubmitHighlighter(baseTextDocument().data());
 }
 
+bool GitEditor::open(QString *errorString, const QString &fileName, const QString &realFileName)
+{
+    bool res = VcsBaseEditorWidget::open(errorString, fileName, realFileName);
+    if (editor()->id() == Git::Constants::GIT_COMMIT_TEXT_EDITOR_ID) {
+        QFileInfo fi(fileName);
+        setSource(GitPlugin::instance()->gitClient()->findRepositoryForGitDir(fi.absolutePath()));
+    }
+    return res;
+}
+
 QString GitEditor::decorateVersion(const QString &revision) const
 {
     const QFileInfo fi(source());
@@ -284,5 +294,11 @@ QString GitEditor::revisionSubject(const QTextBlock &inBlock) const
     return QString();
 }
 
+bool GitEditor::supportChangeLinks() const
+{
+    return VcsBaseEditorWidget::supportChangeLinks()
+            || (editor()->id() == Git::Constants::GIT_COMMIT_TEXT_EDITOR_ID);
+}
+
 } // namespace Internal
 } // namespace Git

src/plugins/git/giteditor.h

@@ -60,6 +60,7 @@ private slots:
 
 private:
     void init();
+    bool open(QString *errorString, const QString &fileName, const QString &realFileName);
     QSet<QString> annotationChanges() const;
     QString changeUnderCursor(const QTextCursor &) const;
     VcsBase::BaseAnnotationHighlighter *createAnnotationHighlighter(const QSet<QString> &changes, const QColor &bg) const;
@@ -68,6 +69,7 @@ private:
     bool isValidRevision(const QString &revision) const;
     void addChangeActions(QMenu *menu, const QString &change);
     QString revisionSubject(const QTextBlock &inBlock) const;
+    bool supportChangeLinks() const;
 
     mutable QRegExp m_changeNumberPattern;
     QString m_currentChange;