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gcode: Return previous handler from register_command(cmd, None)

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When overriding a g-code command, allow the caller to obtain the
previous command handler.  Use this feature in homing_override and
safe_z_home.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2020-02-12 20:19:18 -05:00
parent 512ad4b3a4
commit 0cfab84e1a
3 changed files with 7 additions and 6 deletions
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3
klippy/gcode.py
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@ -71,11 +71,12 @@ class GCodeParser:
return False
def register_command(self, cmd, func, when_not_ready=False, desc=None):
if func is None:
old_cmd = self.ready_gcode_handlers.get(cmd)
if cmd in self.ready_gcode_handlers:
del self.ready_gcode_handlers[cmd]
if cmd in self.base_gcode_handlers:
del self.base_gcode_handlers[cmd]
return
return old_cmd
if cmd in self.ready_gcode_handlers:
raise self.printer.config_error(
"gcode command %s already registered" % (cmd,))