Candle2
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Schildkroet
support multiple machine-specific configurations ("profiles")
This makes Candle2 usable for driving multiple machines from the same computer, by making separate copies of the entire config file per machine.
By default, nothing will change; the file format is unchanged, and the current configuration is treated as a default profile. If multiple profiles are present at startup, the user is prompted to select one. If the environment variable $CANDLE_PROFILE is present and non-empty, that profile is used without prompting.
Profiles are stored in the app config directory, as urlencode(profilename) + ".ini". (URL-encoding the names allows profiles to be named without regard for the platform's file naming rules.)
There is currently no UI for managing profiles; they may be created by manually copying settings.ini to a new file in the same directory, or by setting $CANDLE_PROFILE to a profile that does not yet exist (it will be created with default settings).
My use case here is that I have two GRBL machines now, a laser engraver and a CNC router, and I wanted different user command buttons for each.
I'm not opposed to adding a UI for this; I didn't in this PR because (1) I wanted to make sure you're okay with this before I go expanding on it, and (2) UI design is hard and I don't feel like doing it tonight. :)
