ale/autoload/ale/handlers/haskell.vim

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" Author: w0rp <devw0rp@gmail.com>
" Description: Error handling for the format GHC outputs.
function! ale#handlers#haskell#HandleGHCFormat(buffer, lines) abort
" Look for lines like the following.
"
"Appoint/Lib.hs:8:1: warning:
"Appoint/Lib.hs:8:1:
let l:pattern = '^[^:]\+:\(\d\+\):\(\d\+\):\(.*\)\?$'
let l:output = []
let l:corrected_lines = []
for l:line in a:lines
if len(matchlist(l:line, l:pattern)) > 0
call add(l:corrected_lines, l:line)
elseif l:line ==# ''
call add(l:corrected_lines, l:line)
else
if len(l:corrected_lines) > 0
let l:line = substitute(l:line, '\v^\s+', ' ', '')
let l:corrected_lines[-1] .= l:line
endif
endif
endfor
for l:line in l:corrected_lines
let l:match = matchlist(l:line, l:pattern)
if len(l:match) == 0
continue
endif
let l:errors = matchlist(l:match[3], '\(warning:\|error:\)\(.*\)')
if len(l:errors) > 0
let l:type = l:errors[1]
let l:text = l:errors[2]
else
let l:type = ''
let l:text = l:match[3]
endif
let l:type = l:type ==# '' ? 'E' : toupper(l:type[0])
call add(l:output, {
\ 'lnum': l:match[1] + 0,
\ 'col': l:match[2] + 0,
\ 'text': l:text,
\ 'type': l:type,
\})
endfor
return l:output
endfunction