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ultimate-vim/sources_non_forked/ale/autoload/ale/handlers/gawk.vim

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" Author: Anthony DeDominic <adedomin@gmail.com>
" Description: Handle output from gawk's --lint option
function! ale#handlers#gawk#HandleGawkFormat(buffer, lines) abort
" Look for lines like the following:
" gawk: /tmp/v0fddXz/1/something.awk:1: ^ invalid char ''' in expression
let l:pattern = '^.\{-}:\(\d\+\):\s\+\(warning:\|\^\)\s*\(.*\)'
let l:output = []
for l:match in ale#util#GetMatches(a:lines, l:pattern)
let l:ecode = 'E'
if l:match[2] is? 'warning:'
let l:ecode = 'W'
endif
call add(l:output, {
\ 'lnum': l:match[1] + 0,
\ 'col': 0,
\ 'text': l:match[3],
\ 'code': 0,
\ 'type': l:ecode,
\})
endfor
return l:output
endfunction