Because Zig does not fetch recursive dependencies when you run `zig build
--fetch` (see https://github.com/ziglang/zig/issues/20976) we need to do some
extra work to fetch everything that we actually need to build without Internet
access (such as when building a Nix package).
An example of this happening:
```
error: builder for '/nix/store/cx8qcwrhjmjxik2547fw99v5j6np5san-ghostty-0.1.0.drv' failed with exit code 1;
la/build/tmp.xgHOheUF7V/p/12208cfdda4d5fdbc81b0c44b82e4d6dba2d4a86bff644a153e026fdfc80f8469133/build.zig.zon:7:20: error: unable to discover remote git server capabilities: TemporaryNameServerFailure
> .url = "git+https://github.com/zigimg/zigimg#3a667bdb3d7f0955a5a51c8468eac83210c1439e",
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> /build/tmp.xgHOheUF7V/p/12208cfdda4d5fdbc81b0c44b82e4d6dba2d4a86bff644a153e026fdfc80f8469133/build.zig.zon:16:20: error: unable to discover remote git server capabilities: TemporaryNameServerFailure
> .url = "git+https://github.com/mitchellh/libxev#f6a672a78436d8efee1aa847a43a900ad773618b",
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
For full logs, run 'nix log /nix/store/cx8qcwrhjmjxik2547fw99v5j6np5san-ghostty-0.1.0.drv'.
```
To update this script, add any failing URLs with a line like this:
```
zig fetch <url>
```
Periodically old URLs may need to be cleaned out.
Hopefully when the Zig issue is fixed this script can be eliminated in favor
of a plain `zig build --fetch`.
This adds a "fancy" theme preview to the `+list-themes` CLI action.
By default, if the command is connected to a TTY, it will display the
fancy preview. If it is not connected to a TTY, or the user specifies
`--plain` on the command line, a simple list of themes will be printed
to stdout.
While in the preview `F1` or `?` will show a help screen.
Fixes#2171
ZLS has caused us issues in our Nix shell before and I noted when we
first added it that we probably shouldn't. We now pin to release
versions of Zig so I think its reasonable to expect developers to have
ZLS installed themselves with the proper version or not use it at all.
this should reduce the amount of rebuilds that need to occur that due to
the souce changing invalidating the cache
also note that a update to nixpkgs-stable had to occur such that the new
lib functions existed
