+" Author: Vincent Lequertier <https://github.com/SkySymbol>
+" Description: This file adds support for checking perl syntax
+
+call ale#Set('perl_perl_executable', 'perl')
+call ale#Set('perl_perl_options', '-c -Mwarnings -Ilib')
+
+function! ale_linters#perl#perl#GetCommand(buffer) abort
+ return '%e' . ale#Pad(ale#Var(a:buffer, 'perl_perl_options')) . ' %t'
+endfunction
+
+let s:begin_failed_skip_pattern = '\v' . join([
+\ '^Compilation failed in require',
+\ '^Can''t locate',
+\], '|')
+
+function! ale_linters#perl#perl#Handle(buffer, lines) abort
+ if empty(a:lines)
+ return []
+ endif
+
+ let l:pattern = '\(..\{-}\) at \(..\{-}\) line \(\d\+\)'
+ let l:output = []
+ let l:basename = expand('#' . a:buffer . ':t')
+
+ let l:type = 'E'
+
+ if a:lines[-1] =~# 'syntax OK'
+ let l:type = 'W'
+ endif
+
+ let l:seen = {}
+
+ for l:match in ale#util#GetMatches(a:lines, l:pattern)
+ let l:line = l:match[3]
+ let l:file = l:match[2]
+ let l:text = l:match[1]
+
+ if ale#path#IsBufferPath(a:buffer, l:file)
+ \ && !has_key(l:seen,l:line)
+ \ && (
+ \ l:text isnot# 'BEGIN failed--compilation aborted'
+ \ || empty(l:output)
+ \ || match(l:output[-1].text, s:begin_failed_skip_pattern) < 0
+ \ )
+ call add(l:output, {
+ \ 'lnum': l:line,
+ \ 'text': l:text,
+ \ 'type': l:type,
+ \})
+
+ let l:seen[l:line] = 1
+ endif
+ endfor
+
+ return l:output
+endfunction
+
+call ale#linter#Define('perl', {
+\ 'name': 'perl',
+\ 'executable': {b -> ale#Var(b, 'perl_perl_executable')},
+\ 'output_stream': 'both',
+\ 'command': function('ale_linters#perl#perl#GetCommand'),
+\ 'callback': 'ale_linters#perl#perl#Handle',
+\})