Encapsulate libgit commands into single backend

Sets stage for allowing alternate backends for version control

common/git/git_push_handler.cpp

@@ -22,13 +22,8 @@
  */
 
 #include "git_push_handler.h"
-#include <git/kicad_git_common.h>
-#include <git/kicad_git_memory.h>
 #include <trace_helpers.h>
-
-#include <iostream>
-
-#include <wx/log.h>
+#include "git_backend.h"
 
 GIT_PUSH_HANDLER::GIT_PUSH_HANDLER( KIGIT_COMMON* aRepo ) : KIGIT_REPO_MIXIN( aRepo )
 {}
@@ -38,79 +33,7 @@ GIT_PUSH_HANDLER::~GIT_PUSH_HANDLER()
 
 PushResult GIT_PUSH_HANDLER::PerformPush()
 {
-    std::unique_lock<std::mutex> lock( GetCommon()->m_gitActionMutex, std::try_to_lock );
-
-    if(!lock.owns_lock())
-    {
-        wxLogTrace(traceGit, "GIT_PUSH_HANDLER::PerformPush: Could not lock mutex");
-        return PushResult::Error;
-    }
-
-    PushResult result = PushResult::Success;
-
-    // Fetch updates from remote repository
-    git_remote* remote = nullptr;
-
-    if(git_remote_lookup(&remote, GetRepo(), "origin") != 0)
-    {
-        AddErrorString(_("Could not lookup remote"));
-        return PushResult::Error;
-    }
-
-    KIGIT::GitRemotePtr remotePtr(remote);
-
-    git_remote_callbacks remoteCallbacks;
-    git_remote_init_callbacks(&remoteCallbacks, GIT_REMOTE_CALLBACKS_VERSION);
-    remoteCallbacks.sideband_progress = progress_cb;
-    remoteCallbacks.transfer_progress = transfer_progress_cb;
-    remoteCallbacks.update_tips = update_cb;
-    remoteCallbacks.push_transfer_progress = push_transfer_progress_cb;
-    remoteCallbacks.credentials = credentials_cb;
-    remoteCallbacks.payload = this;
-    GetCommon()->SetCancelled( false );
-
-    TestedTypes() = 0;
-    ResetNextKey();
-
-    if( git_remote_connect( remote, GIT_DIRECTION_PUSH, &remoteCallbacks, nullptr, nullptr ) )
-    {
-        AddErrorString( wxString::Format( _( "Could not connect to remote: %s" ),
-                                          KIGIT_COMMON::GetLastGitError() ) );
-        return PushResult::Error;
-    }
-
-    git_push_options pushOptions;
-    git_push_init_options( &pushOptions, GIT_PUSH_OPTIONS_VERSION );
-    pushOptions.callbacks = remoteCallbacks;
-
-    // Get the current HEAD reference
-    git_reference* head = nullptr;
-
-    if( git_repository_head( &head, GetRepo() ) != 0 )
-    {
-        git_remote_disconnect( remote );
-        AddErrorString( _( "Could not get repository head" ) );
-        return PushResult::Error;
-    }
-
-    KIGIT::GitReferencePtr headPtr( head );
-
-    // Create refspec for current branch
-    const char* refs[1];
-    refs[0] = git_reference_name( head );
-    const git_strarray refspecs = { (char**) refs, 1 };
-
-    if( git_remote_push( remote, &refspecs, &pushOptions ) )
-    {
-        AddErrorString( wxString::Format( _( "Could not push to remote: %s" ),
-                                          KIGIT_COMMON::GetLastGitError() ) );
-        git_remote_disconnect( remote );
-        return PushResult::Error;
-    }
-
-    git_remote_disconnect( remote );
-
-    return result;
+    return GetGitBackend()->Push( this );
 }