Method StartNextGCode

src/GCodes/GCodes.cpp:563–660

Start a new gcode, or continue to execute one that has already been started. Return true if we found something significant to do.

// Start a new gcode, or continue to execute one that has already been started. Return true if we found something significant to do.
bool GCodes::StartNextGCode(GCodeBuffer& gb, const StringRef& reply) noexcept
{
	// There are special rules for fileGCode because it needs to suspend when paused:
	// - if the pause state is paused or resuming, don't execute
	// - if the state is pausing then don't execute, unless we are executing a macro (because it could be the pause macro or filament change macro)
	// - if there is a deferred pause pending, don't execute once we have finished the current macro
	if (   gb.IsFileChannel()
		&& (   pauseState > PauseState::pausing				// paused or resuming
			|| (!gb.IsDoingFileMacro() && (deferredPauseCommandPending != nullptr || pauseState == PauseState::pausing))
		   )
	   )
	{
		// We are paused or pausing, so don't process any more gcodes from the file being printed.
		// There is a potential issue here if fileGCode holds any locks, so unlock everything.
		UnlockAll(gb);
	}
	else if (gb.IsReady() || gb.IsExecuting())
	{
		gb.SetFinished(ActOnCode(gb, reply));
		return true;
	}
	else if (gb.IsDoingFile())
	{
		return DoFilePrint(gb, reply);
	}
	else if (&gb == AutoPauseGCode() && !gb.LatestMachineState().waitingForAcknowledgement)
	{
		if (Event::StartProcessing())
		{
			ProcessEvent(gb);								// call out to separate function to avoid increasing stack usage of this function
		}
	}
	else if (&gb == DaemonGCode()
#if SUPPORT_REMOTE_COMMANDS
			 && !CanInterface::InExpansionMode()			// looking for the daemon.g file increases the loop time too much
#endif
			)
	{
		// Check whether the daemon really is idle and not executing daemon.g, not just waiting for a M291 acknowledgement or something else
		if (   !reprap.IsProcessingConfig()
			&& gb.LatestMachineState().GetPrevious() == nullptr
			&& !gb.LatestMachineState().DoingFile()
		   )
		{
			// Delay 1 or 10 seconds, then try to open and run daemon.g. No error if it is not found.
			if (gb.DoDwellTime((daemonRunning) ? 10000 : 1000))
			{
				daemonRunning = true;
				return DoFileMacro(gb, DAEMON_G, false, AsyncSystemMacroCode);
			}
		}
	}
	else
	{
		const bool gotCommand =
#if HAS_SBC_INTERFACE
			// Two SBC-mode guards on accepting input here:
			// - IsExecutingOnSbc: a code has been handed to DSF for processing (see SendToSbc), so don't