Git: Show Precedes/Follows tags on Show editor

Known limitation: Commit that has a tag shows its own tag on Precedes
field

Change-Id: I533e48b4bb5d57809d8e9f12fa7db5d8706f7372
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/git/gitclient.cpp

@@ -1156,6 +1156,37 @@ QString GitClient::synchronousTopRevision(const QString &workingDirectory, QStri
     return revision;
 }
 
+void GitClient::synchronousTagsForCommit(const QString &workingDirectory, const QString &revision,
+                                         QByteArray &precedes, QByteArray &follows)
+{
+    QStringList arguments;
+    QByteArray parents;
+    arguments << QLatin1String("describe") << QLatin1String("--contains") << revision;
+    fullySynchronousGit(workingDirectory, arguments, &precedes);
+    int tilde = precedes.indexOf('~');
+    if (tilde != -1)
+        precedes.truncate(tilde);
+    else
+        precedes = precedes.trimmed();
+
+    arguments.clear();
+    arguments << QLatin1String("log") << QLatin1String("-n1") << QLatin1String("--pretty=format:%P") << revision;
+    fullySynchronousGit(workingDirectory, arguments, &parents);
+    foreach (const QByteArray &p, parents.split(' ')) {
+        QByteArray pf;
+        arguments.clear();
+        arguments << QLatin1String("describe") << QLatin1String("--tags")
+                  << QLatin1String("--abbrev=0") << QLatin1String(p);
+        fullySynchronousGit(workingDirectory, arguments, &pf);
+        pf.truncate(pf.lastIndexOf('\n'));
+        if (!pf.isEmpty()) {
+            if (!follows.isEmpty())
+                follows += ", ";
+            follows += pf;
+        }
+    }
+}
+
 // Format an entry in a one-liner for selection list using git log.
 QString GitClient::synchronousShortDescription(const QString &workingDirectory, const QString &revision,
                                             const QString &format)

src/plugins/git/gitclient.h

@@ -163,6 +163,8 @@ public:
                                      const QString &format);
     QString synchronousBranch(const QString &workingDirectory);
     QString synchronousTopRevision(const QString &workingDirectory, QString *errorMessage = 0);
+    void synchronousTagsForCommit(const QString &workingDirectory, const QString &revision,
+                                  QByteArray &precedes, QByteArray &follows);
 
     bool cloneRepository(const QString &directory, const QByteArray &url);
     QString vcsGetRepositoryURL(const QString &directory);

src/plugins/git/giteditor.cpp

@@ -207,11 +207,32 @@ static QByteArray removeAnnotationDate(const QByteArray &b)
 void GitEditor::setPlainTextDataFiltered(const QByteArray &a)
 {
     QByteArray array = a;
+    GitPlugin *plugin = GitPlugin::instance();
     // If desired, filter out the date from annotation
-    const bool omitAnnotationDate = contentType() == VcsBase::AnnotateOutput
+    switch (contentType())
-                                    && GitPlugin::instance()->settings().boolValue(GitSettings::omitAnnotationDateKey);
+    {
-    if (omitAnnotationDate)
+    case VcsBase::AnnotateOutput: {
-        array = removeAnnotationDate(a);
+        const bool omitAnnotationDate = plugin->settings().boolValue(GitSettings::omitAnnotationDateKey);
+        if (omitAnnotationDate)
+            array = removeAnnotationDate(a);
+        break;
+    }
+    case VcsBase::DiffOutput: {
+        const QFileInfo fi(source());
+        const QString workingDirectory = fi.absolutePath();
+        QByteArray precedes, follows;
+        if (array.startsWith("commit ")) { // show
+            int lastHeaderLine = array.indexOf("\n\n") + 1;
+            plugin->gitClient()->synchronousTagsForCommit(workingDirectory, QLatin1String(array.mid(7, 8)), precedes, follows);
+            if (!precedes.isEmpty())
+                array.insert(lastHeaderLine, "Precedes: " + precedes + '\n');
+            if (!follows.isEmpty())
+                array.insert(lastHeaderLine, "Follows: " + follows + '\n');
+        }
+        break;
+    }
+    }
+
     setPlainTextData(array);
 }