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_revert_handler.cpp

@@ -0,0 +1,108 @@
+/*
+ * 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 "git_revert_handler.h"
+
+#include <wx/log.h>
+#include <wx/string.h>
+
+GIT_REVERT_HANDLER::GIT_REVERT_HANDLER( git_repository* aRepository )
+{
+    m_repository = aRepository;
+}
+
+GIT_REVERT_HANDLER::~GIT_REVERT_HANDLER()
+{
+}
+
+bool GIT_REVERT_HANDLER::Revert( const wxString& aFilePath )
+{
+    m_filesToRevert.push_back( aFilePath );
+    return true;
+}
+
+static void checkout_progress_cb(const char *path, size_t cur, size_t tot, void *payload)
+{
+    wxLogDebug( "checkout_progress_cb: %s %zu/%zu", path, cur, tot );
+}
+
+
+static int checkout_notify_cb(git_checkout_notify_t why, const char *path,
+                              const git_diff_file *baseline,
+                              const git_diff_file *target,
+                              const git_diff_file *workdir, void *payload)
+{
+    GIT_REVERT_HANDLER* handler = static_cast<GIT_REVERT_HANDLER*>(payload);
+
+    if( why & ( GIT_CHECKOUT_NOTIFY_CONFLICT | GIT_CHECKOUT_NOTIFY_IGNORED | GIT_CHECKOUT_NOTIFY_UPDATED ) )
+        handler->PushFailedFile( path );
+
+    return 0;
+}
+
+void GIT_REVERT_HANDLER::PerformRevert()
+{
+    git_object* head_commit = NULL;
+    git_checkout_options opts = GIT_CHECKOUT_OPTIONS_INIT;
+
+    // Get the HEAD commit
+    if (git_revparse_single(&head_commit, m_repository, "HEAD") != 0) {
+        // Handle error. If we cannot get the HEAD, then there's no point proceeding.
+        return;
+    }
+
+    opts.checkout_strategy = GIT_CHECKOUT_FORCE;
+    char** paths =  new char*[m_filesToRevert.size()];
+
+    for( size_t ii = 0; ii < m_filesToRevert.size(); ii++ )
+    {
+        // Set paths to the specific file
+        paths[ii] = wxStrdup( m_filesToRevert[ii].ToUTF8() );
+    }
+
+    git_strarray arr = { paths, m_filesToRevert.size() };
+
+    opts.paths = arr;
+    opts.progress_cb = checkout_progress_cb;
+    opts.notify_cb = checkout_notify_cb;
+    opts.notify_payload = static_cast<void*>(this);
+
+    // Attempt to checkout the file(s)
+    if (git_checkout_tree(m_repository, head_commit, &opts) != 0)
+    {
+        const git_error *e = git_error_last();
+        if (e)
+        {
+            wxLogError( "Checkout failed: %d: %s", e->klass, e->message );
+        }
+    }
+
+    // Free the HEAD commit
+    for( size_t ii = 0; ii < m_filesToRevert.size(); ii++ )
+        delete( paths[ii] );
+
+    delete[] paths;
+
+    git_object_free(head_commit);
+}
+