Is there a way to get syntax checker working outside of a package?

[sdondley]

I'm new to swift so I'm not familiar with how things are supposed to work. Is there a way to get syntax errors to show up when editing a standalone file?

Similarly, if I edit a file that's part of an xcode project, is there a way to get syntax errors to display?

So far, I've only gotten this to work after init'ing a package and then editing Source/package/main.swift

[keith]

Definitely possible, the syntax checkers checked in to this repo currently only support swiftpm since that's such a common case, but neomake has a direct swiftc example that just parses the current file:

https://github.com/neomake/neomake/blob/76e5b2bad8e98e805ff4749068e6be6206bec2a0/autoload/neomake/makers/ft/swift.vim#L44-L54

[keith]

Kinda related: #142

[sdondley]

Thanks. But I'm confused. I don't understand how your module works with Syntastic or how I would integrate neomake with your module or what swiftpm does exactly (I know what a package manager is but I have no idea why it's involved in syntax checking).

So what do I have to do, exactly, to get syntax checking on a standalone file working?

[sdondley]

Also, another point of confusion for me is that I've got swift syntax checking working on Ubuntu. But when I run swift pacakage --version on my mac, I get this error:

error: unable to invoke subcommand: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-pacakage (No such file or directory)

So I'm not sure how to get this working on my Mac. I thought the package manager would be installed with xcode, though.

[keith]

You have a typo, it's swift package --version

[keith]

You have a few options:

1. You can use this plugin and neomake, this plugin will provide highlighting while neomake would provide the syntax checking
2. If you prefer your current syntax checker you can create a new checker in this repo similar to https://github.com/keith/swift.vim/blob/master/syntax_checkers/swift/swiftpm.vim but replace the fact that it's calling swift build and call swiftc -parse instead.

[sdondley]

doh! thanks. I should put my glasses on, I guess. :)

[keith]

Note that SwiftPM isn't actually only doing syntax checking, the way it is setup in this repo it actually does a build of your package, and reports the compiler errors back

[sdondley]

OK, I think this is starting to make more sense now. Thank you.

[sdondley]

I took a stab at trying to create a new syntax checker (though my vimscript skills are about on par with my swift skills) called swiftc.vim:

if exists('g:loaded_syntastic_swift_swiftc_checker')
  finish
endif
let g:loaded_syntastic_swift_swiftc_checker = 1

if !exists('g:syntastic_swift_swiftc_executable')
  let g:syntastic_swift_swiftc_executable = 'swiftc'
endif

if !exists('g:syntastic_swift_swiftc_arguments')
  let g:syntastic_swift_swiftc_arguments = '-parse'
endif

let s:save_cpo = &cpo
set cpo&vim

function! SyntaxCheckers_swift_swiftc_IsAvailable() dict
  "if !executable(self.getExec())
  "  return 0
  "endif
  return 1

endfunction

function! SyntaxCheckers_swift_swiftc_GetLocList() dict
  let makeprg = self.makeprgBuild({
        \ 'fname': '',
        \ 'args': g:syntastic_swift_swiftc_arguments })

  let errorformat =
        \ '%f:%l:%c: error: %m'

  return SyntasticMake({
        \ 'makeprg': makeprg,
        \ 'errorformat': errorformat })
endfunction

call g:SyntasticRegistry.CreateAndRegisterChecker({
    \ 'filetype': 'swift',
    \ 'name': 'swiftc',
    \ 'exec': g:syntastic_swift_swiftc_executable })

let &cpo = s:save_cpo
unlet s:save_cpo

It doesn't work, though.

[sdondley]

OK, I did a little bit more noodling and got something working:

if exists('g:loaded_syntastic_swift_swiftc_checker')
  finish
endif
let g:loaded_syntastic_swift_swiftc_checker = 1

if !exists('g:syntastic_swift_swiftc_executable')
  let g:syntastic_swift_swiftc_executable = 'swiftc'
endif

if !exists('g:syntastic_swift_swiftc_arguments')
  let g:syntastic_swift_swiftc_arguments = ''
endif

let s:save_cpo = &cpo
set cpo&vim

function! SyntaxCheckers_swift_swiftc_IsAvailable() dict
  "if !executable(self.getExec())
  "  return 0
  "endif
  return 1

endfunction

function! SyntaxCheckers_swift_swiftc_GetLocList() dict
    let file = fnameescape(expand("%:p"))
  let makeprg = self.makeprgBuild({
        \ 'fname': file,
        \ 'args': [''] })

  let errorformat = '%f:%l:%c: error: %m,%W%f:%l:%c: warning: %m,%Z%\s%#^~%#,%-G%.%#'

  return SyntasticMake({
        \ 'makeprg': makeprg,
        \ 'errorformat': errorformat })
endfunction

call g:SyntasticRegistry.CreateAndRegisterChecker({
    \ 'filetype': 'swift',
    \ 'name': 'swiftc',
    \ 'exec': g:syntastic_swift_swiftc_executable })

let &cpo = s:save_cpo
unlet s:save_cpo

Are you interested in having me create a patch for this? I'm sure what I have needs to be fixed up and better integrated with your plugin, though.

[keith]

Yep looks good! If you put it in that directory named swiftc.vim it should "just work" if you enable it in your syntastic config