I'm not totally convinced that the refcounting is right
because I've not seen `dealloc` get triggered, but the
important thing is that closing the window does cause the
rust level objects to be dropped.
Earlier in the life of wezterm we had software rendering in src/xgfx.rs.
This is the bitmap portion of that code from rev
236960e1a8, tweaked slightly for more
recent changes to the palette crate.
Tested only on windows with a USB serial connector to my NUC running
linux.
This allows opening up wezterm on a serial port connection.
Serial is closer to a tty than a pty, so it is a bit different
to configure and use.
This commit allows running:
```
wezterm serial COM3
```
to open a window that connects to the specified COM port.
You can change the baud rate with:
```
wezterm serial --baud 9600 COM3
```
There are more options that could be set, but I'm a bit lazy and
have only exposed the baud rate to the wezterm cli so far.
Previously we had the logic for this in wezterm itself; it would know
how to figure out which shell to run, or whether we should run a
different program by default (the `default_prog` setting).
This was OK, but when I added support for ssh we hit a conceptual
issue: the local side of the ssh session doesn't have any information
about the shell that should be invoked on the remote side and instead
needs to ask the remote to figure that out. The interfaces defined
in the code didn't allow for this.
This commit formalizes the concept of a default program and allows
it to be carried through to the pty layer, including over ssh sessions.
Since we now have enough smarts to figure out the local shell and the
local home dir, I've removed the logic that run `login -pf` on macos
by default; this should make the terminal startup very slightly faster
on macos, but since I'm currently on a windows system, I can only test
linux and windows on this side of this commit. I'll follow up on macos
later.
