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" Author: buffalocoder - https://github.com/buffalocoder
" Description: Elm linting in Ale. Closely follows the Syntastic checker in https://github.com/ElmCast/elm-vim.
function! ale_linters#elm#make#Handle(buffer, lines) abort
let l:output = []
let l:is_windows = has('win32')
let l:temp_dir = l:is_windows ? $TMP : $TMPDIR
for l:line in a:lines
if l:line[0] ==# '['
let l:errors = json_decode(l:line)
for l:error in l:errors
" Check if file is from the temp directory.
" Filters out any errors not related to the buffer.
if l:is_windows
let l:file_is_buffer = l:error.file[0:len(l:temp_dir) - 1] ==? l:temp_dir
else
let l:file_is_buffer = l:error.file[0:len(l:temp_dir) - 1] ==# l:temp_dir
endif
if l:file_is_buffer
call add(l:output, {
\ 'bufnr': a:buffer,
\ 'lnum': l:error.region.start.line,
\ 'vcol': 0,
\ 'col': l:error.region.start.column,
\ 'type': (l:error.type ==? 'error') ? 'E' : 'W',
\ 'text': l:error.overview,
\ 'nr': -1,
\})
endif
endfor
endif
endfor
return l:output
endfunction
" Return the command to execute the linter in the projects directory.
" If it doesn't, then this will fail when imports are needed.
function! ale_linters#elm#make#GetCommand(buffer) abort
let l:elm_package = ale#util#FindNearestFile(a:buffer, 'elm-package.json')
if empty(l:elm_package)
let l:dir_set_cmd = ''
else
let l:root_dir = fnamemodify(l:elm_package, ':p:h')
let l:dir_set_cmd = 'cd ' . fnameescape(l:root_dir) . ' && '
endif
" The elm-make compiler, at the time of this writing, uses '/dev/null' as
" a sort of flag to tell the compiler not to generate an output file,
" which is why this is hard coded here.
" Source: https://github.com/elm-lang/elm-make/blob/master/src/Flags.hs
let l:elm_cmd = 'elm-make --report=json --output='.shellescape('/dev/null')
return l:dir_set_cmd . ' ' . l:elm_cmd . ' %t'
endfunction
call ale#linter#Define('elm', {
\ 'name': 'make',
\ 'executable': 'elm-make',
\ 'output_stream': 'both',
\ 'command_callback': 'ale_linters#elm#make#GetCommand',
\ 'callback': 'ale_linters#elm#make#Handle'
\})
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