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save_variables: Support saving variables to a disk file

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Signed-off-by: Dushyant Ahuja dusht.ahuja@gmail.com
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2020-12-03 12:05:46 -05:00
parent 91de1560a7
commit d7053f6e71
4 changed files with 123 additions and 0 deletions
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35
docs/Command_Templates.md
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@@ -396,3 +396,38 @@ gcode:
```
UPDATE_DELAYED_GCODE ID=report_temp DURATION=0
```
### Save Variables to disk
If a
[save_variables config section](Config_Reference.md#save_variables)
has been enabled, `SAVE_VARIABLE VARIABLE=<name> VALUE=<value>` can be
used to save the variable to disk so that it can be used across
restarts. All stored variables are loaded into the
`printer.save_variables.variables` dict at startup and can be used in
gcode macros. to avoid overly long lines you can add the following at
the top of the macro:
```
{% set svv = printer.save_variables.variables %}
```
As an example, it could be used to save the state of 2-in-1-out hotend
and when starting a print ensure that the active extruder is used,
instead of T0:
```
[gcode_macro T1]
gcode:
ACTIVATE_EXTRUDER extruder=extruder1
SAVE_VARIABLE VARIABLE=currentextruder VALUE='"extruder1"'
[gcode_macro T0]
gcode:
ACTIVATE_EXTRUDER extruder=extruder
SAVE_VARIABLE VARIABLE=currentextruder VALUE='"extruder"'
[gcode_macro START_GCODE]
gcode:
{% set svv = printer.save_variables.variables %}
ACTIVATE_EXTRUDER extruder={svv.currentextruder}
```