[feature] `swhks` env var synchronization sequence with `swhkd`

[Shinyzenith]

If an initiation sequence takes place between the client and the daemon then we can synchronize environment variables into swhkd.

This has multiple benefits in code such as:

• Parse environment variables in the config file.
• Check the environment swhkd is running on and conditionally perform logic such as set repeat rate on X11.
• Resolve ~/.config/swhkd/swhkdrc instead of /etc/swhkd/swhkdrc for default config file detection!
• etc.

Ref: #117
Ref: #76

[Shinyzenith]

@ajanon Hi Alexis, what are your thoughts on this? How do you think we should try implementing this?

[ajanon]

I feel like ideally we could have bidirectional communication between sxhkd and swhkd, and swhkd could then request environment variables values only when needed at runtime, but this may add much more complexity.

I am not very familiar with the IPC system we have, so this may be completely off. What do you think?

[Shinyzenith]

bidirectional communication between sxhkd and swhkd

Do you mean swhks and swhkd?

when needed at runtime, but this may add much more complexity

In my opinion swhks is a fairly trivial program, we just have a socket that we write commands to, it's nothing more than that,

A simple if check for a specially crafted message for requesting environment variables will take little to no effort I believe?

[ajanon]

bidirectional communication between sxhkd and swhkd

Do you mean swhks and swhkd?

Yes, that was a typo.

when needed at runtime, but this may add much more complexity

In my opinion swhks is a fairly trivial program, we just have a socket that we write commands to, it's nothing more than that,

A simple if check for a specially crafted message for requesting environment variables will take little to no effort I believe?

Would you mind taking a shot at implementing this if/when you have some time on your hands then?

[Shinyzenith]

A simple if check for a specially crafted message for requesting environment variables will take little to no effort I believe?

Would you mind taking a shot at implementing this if/when you have some time on your hands then?

Absolutely!

[Shinyzenith]

While attempting to write a PoC for this a peculiar question came to mind: What if we want to resolve $TERMINAL variable from the config file during execution? Should this be done on swhks side after parsing out the command and looking for environment variables? Or should this be done in the daemon itself after config parsing?