Add support for checking Cython files

README.md

@@ -31,6 +31,7 @@ name. That seems to be the fairest way to arrange this table.
 | C | [gcc](https://gcc.gnu.org/) |
 | CoffeeScript | [coffeelint](https://www.npmjs.com/package/coffeelint) |
 | CSS | [csslint](http://csslint.net/)^ |
+| Cython (pyrex filetype) | [cython](http://cython.org/) |
 | D | [dmd](https://dlang.org/dmd-linux.html)^ |
 | Fortran | [gcc](https://gcc.gnu.org/) |
 | Haskell | [ghc](https://www.haskell.org/ghc/)^ |

ale_linters/pyrex/cython.vim

@@ -0,0 +1,45 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: cython syntax checking for cython files.
+
+function! ale_linters#pyrex#cython#Handle(buffer, lines)
+    " Matches patterns line the following:
+    "
+    " test.pyx:13:25: Expected ':', found 'NEWLINE'
+    let pattern = '^.\+:\(\d\+\):\(\d\+\): \(.\+\)$'
+    let output = []
+
+    for line in a:lines
+        let l:match = matchlist(line, pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        if l:match[3] =~# 'is not a valid module name$'
+            " Skip invalid module name errors.
+            continue
+        endif
+
+        call add(output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[1] + 0,
+        \   'vcol': 0,
+        \   'col': l:match[2] + 0,
+        \   'text': l:match[3],
+        \   'type': 'E',
+        \   'nr': -1,
+        \})
+    endfor
+
+    return output
+endfunction
+
+call ALEAddLinter('pyrex', {
+\   'name': 'cython',
+\   'output_stream': 'stderr',
+\   'executable': 'cython',
+\   'command': g:ale#util#stdin_wrapper
+\       . ' .pyx cython --warning-extra -o '
+\       . g:ale#util#nul_file,
+\   'callback': 'ale_linters#pyrex#cython#Handle',
+\})

doc/ale.txt

@@ -44,6 +44,7 @@ The following languages and tools are supported.
 * C: 'gcc'
 * CoffeeScript: 'coffelint'
 * CSS: 'csslint'
+* Cython (pyrex filetype): 'cython'
 * D: 'dmd'
 * Fortran: 'gcc'
 * Haskell: 'ghc'

plugin/ale/util.vim

@@ -30,3 +30,10 @@ endfunction
 function! ale#util#FindNearestFile(buffer, filename)
     return findfile(a:filename, fnamemodify(bufname(a:buffer), ':p') . ';')
 endfunction
+
+" A null file for sending output to nothing.
+let g:ale#util#nul_file = '/dev/null'
+
+if has('win32')
+    let g:ale#util#nul_file = 'nul'
+endif