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# Add ability to define custom g-code macros
#
# Copyright (C) 2018-2019 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import traceback, logging
import jinja2
######################################################################
# Template handling
######################################################################
# Wrapper for access to printer object get_status() methods
class GetStatusWrapper:
def __init__(self, printer, eventtime=None):
self.printer = printer
self.eventtime = eventtime
self.cache = {}
def __getitem__(self, val):
sval = str(val).strip()
if sval in self.cache:
return self.cache[sval]
po = self.printer.lookup_object(sval, None)
if po is None or not hasattr(po, 'get_status'):
raise KeyError(val)
if self.eventtime is None:
self.eventtime = self.printer.get_reactor().monotonic()
self.cache[sval] = res = dict(po.get_status(self.eventtime))
return res
def __contains__(self, val):
try:
self.__getitem__(val)
except KeyError as e:
return False
return True
# Wrapper around a Jinja2 template
class TemplateWrapper:
def __init__(self, printer, env, name, script):
self.printer = printer
self.name = name
self.gcode = self.printer.lookup_object('gcode')
try:
self.template = env.from_string(script)
except Exception as e:
msg = "Error loading template '%s': %s" % (
name, traceback.format_exception_only(type(e), e)[-1])
logging.exception(msg)
raise printer.config_error(msg)
def create_status_wrapper(self, eventtime=None):
return GetStatusWrapper(self.printer, eventtime)
def render(self, context=None):
if context is None:
context = {'printer': self.create_status_wrapper()}
try:
return str(self.template.render(context))
except Exception as e:
msg = "Error evaluating '%s': %s" % (
self.name, traceback.format_exception_only(type(e), e)[-1])
logging.exception(msg)
raise self.gcode.error(msg)
def run_gcode_from_command(self, context=None):
self.gcode.run_script_from_command(self.render(context))
# Main gcode macro template tracking
class PrinterGCodeMacro:
def __init__(self, config):
self.printer = config.get_printer()
self.env = jinja2.Environment('{%', '%}', '{', '}')
def load_template(self, config, option, default=None):
name = "%s:%s" % (config.get_name(), option)
if default is None:
script = config.get(option)
else:
script = config.get(option, default)
return TemplateWrapper(self.printer, self.env, name, script)
def load_config(config):
return PrinterGCodeMacro(config)
######################################################################
# GCode macro
######################################################################
class GCodeMacro:
def __init__(self, config):
name = config.get_name().split()[1]
self.alias = name.upper()
printer = config.get_printer()
gcode_macro = printer.try_load_module(config, 'gcode_macro')
self.template = gcode_macro.load_template(config, 'gcode')
self.gcode = printer.lookup_object('gcode')
self.gcode.register_command(self.alias, self.cmd, desc=self.cmd_desc)
self.gcode.register_mux_command("SET_GCODE_VARIABLE", "MACRO",
name, self.cmd_SET_GCODE_VARIABLE,
desc=self.cmd_SET_GCODE_VARIABLE_help)
self.in_script = False
prefix = 'default_parameter_'
self.kwparams = { o[len(prefix):].upper(): config.get(o)
for o in config.get_prefix_options(prefix) }
prefix = 'variable_'
self.variables = { o[len(prefix):]: config.get(o)
for o in config.get_prefix_options(prefix) }
def get_status(self, eventtime):
return dict(self.variables)
cmd_SET_GCODE_VARIABLE_help = "Set the value of a G-Code macro variable"
def cmd_SET_GCODE_VARIABLE(self, params):
variable = self.gcode.get_str('VARIABLE', params)
value = self.gcode.get_str('VALUE', params)
if variable not in self.variables:
if variable in self.kwparams:
self.kwparams[variable] = value
return
raise self.gcode.error("Unknown gcode_macro variable '%s'" % (
variable,))
self.variables[variable] = value
cmd_desc = "G-Code macro"
def cmd(self, params):
if self.in_script:
raise self.gcode.error(
"Macro %s called recursively" % (self.alias,))
kwparams = dict(self.kwparams)
kwparams.update(params)
kwparams.update(self.variables)
kwparams['printer'] = self.template.create_status_wrapper()
kwparams['params'] = params
self.in_script = True
try:
self.template.run_gcode_from_command(kwparams)
finally:
self.in_script = False
def load_config_prefix(config):
return GCodeMacro(config)
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