Add meson as formatter

[Totto16]

Add meson as formatter

Since meson 1.5.0 meson has a format subcommand, see here

Meson has support for stdin as input since 1.7.0 see here (from the PR from here: mesonbuild/meson#13793)

Notes

This only works since meson 1.7.0 because:

I tested several ways on how to get this to work with >= 1.5.0 and < 1.7.0. But after countless attempts, it didn't work, for some tests see e.g. Totto16/vscode-meson:add_meson_formatter_experiments and in the files utils.ts:55 and utils.ts:104

The main problem with using somethings like "/dev/stdin" "/dev/fd/0" "/proc/self/fd/0" instead of the "-" option only supported since 1.7.0 is the way node child processes handle stdin, see here

If anyone has an idea, on how to "polyfill" stdin in >=1.5.0 < 1.7.0 please share it with me 😓

Conclusion

Otherwise this works fine, I tested it with the 1.7.0 release and it works as expected.

Every new setting works as expected, it is a bit annoying, that, if you make some errors in the config, you have to check the output, and don't get intellisense (the error) in the file (if it's in the current workspace) , but thats a "premium" feature and not essential to this PR

TODO

• Get it to work
• Wait for the "-" feature to release
• Add syntax highlighting and maybe also supported values for meson.format files

[tristan957]

Super excited for this!

[Totto16]

Super excited for this!

Me too, but still figuring out, what the best way of doing this is.

I never managed to create an issue in meson, since some things don't work as expected. With muon you can use "-" as file and it reads from stdin, but with meson this doesn't work yet. I looked into the source code, but it's more complicated, since you have more options, can have multiple file and other more complicated things. It would be nice, If we would Be able to discuss this over there, and see what the best solution for that would be, as for now, in meson v1.5.0 I tried "/dev/stdin" and "/dev/fd/0" But they worked only in a interactive terminal and not in the extension 😓

You are also a contributor in meson, so maybe you have an idea how to do this in a way, that is already supported in v1.5.0 and we should create an issue there, so that it would be supported in a better way, than through a hack 🤔

Edit: I created mesonbuild/meson#13791

[tristan957]

Maybe that is an issue that I can get to in the future.

[Totto16]

Since meson v1.7.0 released today, this now works, there are two version checks in the code atm, since only >=1.7.0 supports the needed feature, to use the stdin. I tried several ways to "polyfill" this behavior in >=1.5.0 < 1.7.0 but didn't succeed.

Feel free to try this, it should work as expected.

@tristan957