Vcs: Introduce IVersionControl::unmanagedFiles()

... and use it in VcsManager::promptToAdd().
This is purely a refactoring. The different IVersionControl subclasses
can (and should) override the naive base class implementation in the
future.

Change-Id: Ifdf49852a98f53a95dad1a89131243b21052bc66
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/coreplugin/iversioncontrol.cpp

@@ -26,6 +26,7 @@
 #include "iversioncontrol.h"
 #include "vcsmanager.h"
 
+#include <utils/algorithm.h>
 #include <utils/hostosinfo.h>
 #include <utils/qtcassert.h>
 
@@ -147,6 +148,14 @@ IVersionControl::~IVersionControl()
     delete m_topicCache;
 }
 
+QStringList IVersionControl::unmanagedFiles(const QString &workingDir,
+                                            const QStringList &filePaths) const
+{
+    return Utils::filtered(filePaths, [wd = QDir(workingDir), this](const QString &f) {
+        return !managesFile(wd.path(), wd.relativeFilePath(f));
+    });
+}
+
 IVersionControl::OpenSupportMode IVersionControl::openSupportMode(const QString &fileName) const
 {
     Q_UNUSED(fileName)

src/plugins/coreplugin/iversioncontrol.h

@@ -123,6 +123,15 @@ public:
      */
     virtual bool managesFile(const QString &workingDirectory, const QString &fileName) const = 0;
 
+    /*!
+     * Returns the subset of \a filePaths that is not managed by this version control.
+     *
+     * \a workingDirectory is assumed to be part of a valid repository (not necessarily its
+     * top level). The \a filePaths are expected to be absolute paths.
+     */
+    virtual QStringList unmanagedFiles(const QString &workingDir,
+                                       const QStringList &filePaths) const;
+
     /*!
      * Returns true is the VCS is configured to run.
      */

src/plugins/coreplugin/vcsmanager.cpp

@@ -400,12 +400,7 @@ void VcsManager::promptToAdd(const QString &directory, const QStringList &fileNa
     if (!vc || !vc->supportsOperation(IVersionControl::AddOperation))
         return;
 
-    QStringList unmanagedFiles;
-    QDir dir(directory);
-    foreach (const QString &fileName, fileNames) {
-        if (!vc->managesFile(directory, dir.relativeFilePath(fileName)))
-            unmanagedFiles << fileName;
-    }
+    const QStringList unmanagedFiles = vc->unmanagedFiles(directory, fileNames);
     if (unmanagedFiles.isEmpty())
         return;