Git: Add git bash to tools menu

Can be useful to perform tasks that don't have
a dedicated UI in Creator.

In my setup, git bash was directly in the git
installation folder %ProgramFiles%\Git and
therefore one level above git.exe itself.

Change-Id: I1ca0d3439690170d7fb840bca17e2c412effe0a4
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/git/gitplugin.cpp

@@ -303,6 +303,7 @@ public:
     void gitkForCurrentFile();
     void gitkForCurrentFolder();
     void gitGui();
+    void gitBash();
     void cleanProject();
     void cleanRepository();
     void updateSubmodules();
@@ -962,6 +963,14 @@ GitPluginPrivate::GitPluginPrivate()
             = createRepositoryAction(gitToolsMenu, tr("Merge Tool"), "Git.MergeTool",
                                      context, true, std::bind(&GitPluginPrivate::startMergeTool, this));
 
+    // --------------
+    if (Utils::HostOsInfo::isWindowsHost()) {
+        gitToolsMenu->addSeparator(context);
+
+        createRepositoryAction(gitToolsMenu, tr("Git Bash"), "Git.GitBash",
+                               context, true, std::bind(&GitPluginPrivate::gitBash, this));
+    }
+
     /* \"Git Tools" menu */
 
     // --------------
@@ -1282,6 +1291,13 @@ void GitPluginPrivate::gitGui()
     m_gitClient.launchGitGui(state.topLevel());
 }
 
+void GitPluginPrivate::gitBash()
+{
+    const VcsBasePluginState state = currentState();
+    QTC_ASSERT(state.hasTopLevel(), return);
+    m_gitClient.launchGitBash(state.topLevel());
+}
+
 void GitPluginPrivate::startCommit(CommitType commitType)
 {
     if (!promptBeforeCommit())