ALE linter for zig

zig.vim

" Author: Kevin Watters <kevinwatters@gmail.com>
" Description: This file adds support for checking zig code.

function! ale_linters#zig#zig#GetExecutable(buffer) abort
    return g:ale_zig_compiler
endfunction

function! s:find_build_dir(direc, count) abort
    let l:path = a:direc . "/build.zig"
    if filereadable(l:path)
        return a:direc
    else
        if a:count < 10
            return s:find_build_dir(expand(a:direc . "../"), a:count + 1)
        endif
    endif 

    return "."
endif

endfunction

function! ale_linters#zig#zig#GetCommand(buffer) abort
    let l:buf_direc = expand('%:h')
    let l:direc = s:find_build_dir(l:buf_direc, 0)

    return 'cd ' . direc . ' && ' . fnameescape(ale_linters#zig#zig#GetExecutable(a:buffer))
    \   . ' build --verbose'
endfunction

function! ale_linters#zig#zig#HandleZigCompilerCheck(buffer, lines) abort
    " Regular expression to match messages:
    " They look like:
    "
    " C:\Users\Foo\src\myproject\src\main.zig:24:4: error: invalid token: '.'
    "
    let l:pattern = '\v([^\(]+):(\d+):(\d+): error: (.*)$'

    let l:output = [] " For each match, update the l:output list:

    for l:match in ale#util#GetMatches(a:lines, l:pattern)
        call add(l:output, {
        \   'filename': expand(l:match[1]),
        \   'lnum': str2nr(l:match[2]),
        \   'col': str2nr(l:match[3]),
        \   'text': l:match[4],
        \   'type': 'E'
        \})
    endfor

    return l:output
endfunction

call ale#linter#Define('zig', {
\   'name': 'zig',
\   'executable_callback': 'ale_linters#zig#zig#GetExecutable',
\   'command_callback': 'ale_linters#zig#zig#GetCommand',
\   'callback': 'ale_linters#zig#zig#HandleZigCompilerCheck',
\   'output_stream': 'both'
\})