The ultimate Vim configuration: vimrc
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" Author: Magnus Ottenklinger - https://github.com/evnu
let g:ale_erlang_erlc_options = get(g:, 'ale_erlang_erlc_options', '')
function! ale_linters#erlang#erlc#GetCommand(buffer) abort
let l:output_file = ale#util#Tempname()
call ale#command#ManageFile(a:buffer, l:output_file)
return 'erlc -o ' . ale#Escape(l:output_file)
\ . ' ' . ale#Var(a:buffer, 'erlang_erlc_options')
\ . ' %t'
endfunction
function! ale_linters#erlang#erlc#Handle(buffer, lines) abort
" Matches patterns like the following:
"
" error.erl:4: variable 'B' is unbound
" error.erl:3: Warning: function main/0 is unused
" error.erl:4: Warning: variable 'A' is unused
let l:pattern = '\v^([a-zA-Z]?:?[^:]+):(\d+): (Warning: )?(.+)$'
" parse_transforms are a special case. The error message does not indicate a location:
" error.erl: undefined parse transform 'some_parse_transform'
let l:pattern_parse_transform = '\v(undefined parse transform .*)$'
let l:output = []
let l:pattern_no_module_definition = '\v(no module definition)$'
let l:pattern_unused = '\v(.* is unused)$'
let l:is_hrl = fnamemodify(bufname(a:buffer), ':e') is# 'hrl'
for l:line in a:lines
let l:match = matchlist(l:line, l:pattern)
" Determine if the output indicates an error. We distinguish between two cases:
"
" 1) normal errors match l:pattern
" 2) parse_transform errors match l:pattern_parse_transform
"
" If none of the patterns above match, the line can be ignored
if len(l:match) == 0 " not a 'normal' warning or error
let l:match_parse_transform = matchlist(l:line, l:pattern_parse_transform)
if len(l:match_parse_transform) == 0 " also not a parse_transform error
continue
endif
call add(l:output, {
\ 'bufnr': a:buffer,
\ 'lnum': 0,
\ 'col': 0,
\ 'type': 'E',
\ 'text': l:match_parse_transform[0],
\})
continue
endif
let l:line = l:match[2]
let l:warning_or_text = l:match[3]
let l:text = l:match[4]
" If this file is a header .hrl, ignore the following expected messages:
" - 'no module definition'
" - 'X is unused'
if l:is_hrl && (
\ match(l:text, l:pattern_no_module_definition) != -1
\ || match(l:text, l:pattern_unused) != -1
\)
continue
endif
if !empty(l:warning_or_text)
let l:type = 'W'
else
let l:type = 'E'
endif
call add(l:output, {
\ 'bufnr': a:buffer,
\ 'lnum': l:line,
\ 'col': 0,
\ 'type': l:type,
\ 'text': l:text,
\})
endfor
return l:output
endfunction
call ale#linter#Define('erlang', {
\ 'name': 'erlc',
\ 'executable': 'erlc',
\ 'command': function('ale_linters#erlang#erlc#GetCommand'),
\ 'callback': 'ale_linters#erlang#erlc#Handle',
\})