ADDED: Git integration support

Adds support for project-based git integration, branch support, commit,
revert and updates

Fixes https://gitlab.com/kicad/code/kicad/issues/10441

common/git/git_remove_from_index_handler.cpp

@@ -0,0 +1,98 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2023 KiCad Developers, see AUTHORS.TXT for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/gpl-3.0.html
+ * or you may search the http://www.gnu.org website for the version 3 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <wx/string.h>
+#include <wx/log.h>
+
+#include "git_remove_from_index_handler.h"
+
+GIT_REMOVE_FROM_INDEX_HANDLER::GIT_REMOVE_FROM_INDEX_HANDLER( git_repository* aRepository )
+{
+    m_repository = aRepository;
+    m_filesToRemove.clear();
+}
+
+GIT_REMOVE_FROM_INDEX_HANDLER::~GIT_REMOVE_FROM_INDEX_HANDLER()
+{
+}
+
+bool GIT_REMOVE_FROM_INDEX_HANDLER::RemoveFromIndex( const wxString& aFilePath )
+{
+    // Test if file is currently in the index
+
+    git_index* index = nullptr;
+    size_t at_pos = 0;
+
+    if( git_repository_index( &index, m_repository ) != 0 )
+    {
+        wxLogError( "Failed to get repository index" );
+        return false;
+    }
+
+    if( git_index_find( &at_pos, index, aFilePath.ToUTF8().data() ) != 0 )
+    {
+        git_index_free( index );
+        wxLogError( "Failed to find index entry for %s", aFilePath );
+        return false;
+    }
+
+    git_index_free( index );
+
+    m_filesToRemove.push_back( aFilePath );
+    return true;
+}
+
+void GIT_REMOVE_FROM_INDEX_HANDLER::PerformRemoveFromIndex()
+{
+    for( auto& file : m_filesToRemove )
+    {
+        git_index* index = nullptr;
+        git_oid oid;
+
+        if( git_repository_index( &index, m_repository ) != 0 )
+        {
+            wxLogError( "Failed to get repository index" );
+            return;
+        }
+
+        if( git_index_remove_bypath( index, file.ToUTF8().data() ) != 0 )
+        {
+            wxLogError( "Failed to remove index entry for %s", file );
+            return;
+        }
+
+        if( git_index_write( index ) != 0 )
+        {
+            wxLogError( "Failed to write index" );
+            return;
+        }
+
+        if( git_index_write_tree( &oid, index ) != 0 )
+        {
+            wxLogError( "Failed to write index tree" );
+            return;
+        }
+
+        git_index_free( index );
+    }
+}