Add a Syntastic plugin for Rust.

[BurntSushi]

This plugin used to be in the Syntastic tree, but it was removed. I'm hoping it can find its new home here.

cc @chris-morgan @kballard @wting

[lilyball]

LGTM. I'll r+ it if others agree.

[BurntSushi]

FYI, I've added the rust file type as pointed out by @lcd047.

[thehydroimpulse]

+1 Thanks for doing this!

[chris-morgan]

@BurntSushi Does putting the syntastic_extra_filetypes option inside the file actually work? I wouldn’t expect it to, but I haven’t tried it yet. I would expect it would need to be in autoload or similar.

[BurntSushi]

@chris-morgan For me, the plugin works both with and without syntastic_extra_filetypes. Here's what the wiki says about it:

If your checker adds a filetype previously unknown to syntastic and you care about proper tab completion, you need to tell syntastic about it. The variable g:syntastic_extra_filetypes can be used for this purpose.

AFAIK, the line with g:SyntasticRegistry.CreateAndRegisterChecker is what is actually registering the syntax checker.

I'm not sure if any autoload commands are needed. It seems like both of these things are modifying some global state that Syntastic cares about. Presumably Syntastic handles the rest?

[lcd047]

Does putting the syntastic_extra_filetypes option inside the file actually work?

It doesn't. The checker file is sourced only when syntastic tries to run a checker against a file with filetype rust. Variable g:syntastic_extra_filetypes has to be set always.

For me, the plugin works both with and without syntastic_extra_filetypes.

Syntax checking works. What doesn't work is tab completion. Say, you open a Python file, and you type

:SyntasticInfo r

and then press Tab: then only ruby racket r rst is offered for completion (provided that you have the corresponding binaries installed), rust isn't.

Just put syntastic_extra_filetypes in a file that is always sourced, f.i. etc/vim/syntax/rust.vim

[BurntSushi]

OK, I've updated the PR with @lcd047's suggested changes. Thank you!

[lilyball]

syntax/rust.vim isn't always sourced either (also, that's not a good place to put variables like this in the first place).

Just make a plugin/rust.vim and put it there.

[BurntSushi]

@kballard Ah OK, all set. Sorry, my Vimscript is not so great.