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Hi, I want to report my issues with this installation specific to the hardware in the title.. I'm learning on the go, not a computer guy so I can say some bull***.
Assuming this pc is legacy only I successfully installed LCNC (title) on reboot I'm getting error no operative system found. So I made my research and seems in my situation I need to install GRUB directly on the main partition ./root ? I somehow successfully installed it via the installer, but cannot replicate what I did previously for a new install, luckly I was taking some pictures of the previous screens that I guess installed GRUB manually. 

In the source i see you how you handle expressions.

I shoukd use a lib like: mu parser to handle expressions. 
This also handles and updates gcode variables for you. 

It wont run (nested) while loops. This while loop algo you can design yourself.

in future i love to see gcode dialect parsing,
given a json config file.

Then hopely the interpreter is also able to read fanuc and kuka robot language and produce the motion outputs for it. An extended version off straight_feed xyz...
would look like straigt_feed j1 j2 ....

Mu parser example

Pcw had no luck on Mesa. The install script
destroyed his home directory back then.
This was done by a rm -rf command 
wich can do nasty things so we dont use that any more for cleaning up environment.

I only tested it on Ethercat with el2124 driven steppers and delta servo.