Adds Cython-lint to ALE

cython-lint.vim

" cython-lint ALE linter (assumes you have cython lint installedhttps://github.com/MarcoGorelli/cython-lint)
" 
" Usage, place under ale_linters/pyrex/cython-lint.vim
" Configure the following in your vim config (e.g. .vimrc)
"
" let g:ale_linters = {
" \   'pyrex': ['cython-lint', 'cython'],
" \}
" let g:ale_cython_cython_lint_executable = 'cython-lint'

call ale#Set('pyrex_cython_executable', 'cython-lint')

function! ALE_cython_lint_handle(buffer, lines) abort
    " Regex from flake8
    let l:pattern = '\v^[a-zA-Z]?:?[^:]+:(\d+):?(\d+)?: ([[:alnum:]]+):? (.*)$'
    let l:output = []

    for l:match in ale#util#GetMatches(a:lines, l:pattern)
        call add(l:output, {
        \   'lnum': l:match[1] + 0,
        \   'col': l:match[2] + 0,
        \   'text': l:match[4],
        \   'type': 'W',
        \})
    endfor

    return l:output
endfunction

function! s:build_cython_lint_command(buffer) abort
    let l:executable = ale#Var(a:buffer, 'pyrex_cython_lint_executable')
    return l:executable . ' %t 2>&1'
endfunction


call ale#linter#Define('pyrex', {
\   'name': 'cython-lint',
\   'output_stream': 'stdout',
\   'executable': {b -> ale#Var(b, 'pyrex_cython_lint_executable')},
\   'command': function('s:build_cython_lint_command'),
\   'callback': 'ALE_cython_lint_handle',
\})