Perlcritic column number and rule names (#640)

* Add column number to perlcritic linting output

This returns the column number of the perlcritic error so that ale can
show the column in addition to the line where perlcritic found an error.

* Add perlcritic configuration for rule names

This adds a configuration setting so that the name of the perlcritic
rule is shown [Rule::Name] after the error message.

This is useful to lookup the rule failure.

* Add a vader test for perlcritic#GetCommand

ale_linters/perl/perlcritic.vim

@@ -1,14 +1,29 @@
 " Author: Vincent Lequertier <https://github.com/SkySymbol>
 " Description: This file adds support for checking perl with perl critic
 
+if !exists('g:ale_perl_perlcritic_showrules')
+    let g:ale_perl_perlcritic_showrules = 0
+endif
+
+function! ale_linters#perl#perlcritic#GetCommand(buffer) abort
+    let l:critic_verbosity = '%l:%c %m\n'
+    if g:ale_perl_perlcritic_showrules
+        let l:critic_verbosity = '%l:%c %m [%p]\n'
+    endif
+
+    return "perlcritic --verbose '". l:critic_verbosity . "' --nocolor"
+endfunction
+
+
 function! ale_linters#perl#perlcritic#Handle(buffer, lines) abort
-    let l:pattern = '\(.\+\) at \(.\+\) line \(\d\+\)'
+    let l:pattern = '\(\d\+\):\(\d\+\) \(.\+\)'
     let l:output = []
 
     for l:match in ale#util#GetMatches(a:lines, l:pattern)
         call add(l:output, {
-        \   'text': l:match[1],
-        \   'lnum': l:match[3],
+        \   'lnum': l:match[1],
+        \   'col': l:match[2],
+        \   'text': l:match[3],
         \})
     endfor
 
@@ -19,6 +34,6 @@ call ale#linter#Define('perl', {
 \   'name': 'perlcritic',
 \   'executable': 'perlcritic',
 \   'output_stream': 'stdout',
-\   'command': 'perlcritic --verbose 3 --nocolor',
+\   'command_callback': 'ale_linters#perl#perlcritic#GetCommand',
 \   'callback': 'ale_linters#perl#perlcritic#Handle',
 \})

doc/ale-perl.txt

@@ -22,5 +22,17 @@ g:ale_perl_perl_options                               *g:ale_perl_perl_options*
   invocation.
 
 
+-------------------------------------------------------------------------------
+perlcritic                                                *ale-perl-perlcritic*
+
+g:ale_perl_perlcritic_showrules               *g:ale_perl_perlcritic_showrules*
+
+  Type: |Number|
+  Default: 0
+
+  Controls whether perlcritic rule names are shown after the error message.
+  Defaults to off to reduce length of message.
+
+
 -------------------------------------------------------------------------------
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale.txt

@@ -63,6 +63,7 @@ CONTENTS                                                         *ale-contents*
       merlin..............................|ale-ocaml-merlin|
     perl..................................|ale-perl-options|
       perl................................|ale-perl-perl|
+      perlcritic..........................|ale-perl-perlcritic|
     php...................................|ale-php-options|
       phpcs...............................|ale-php-phpcs|
       phpmd...............................|ale-php-phpmd|

test/test_perlcritic_showrules.vader

@@ -0,0 +1,16 @@
+Execute(no g:ale_perl_perlcritic_showrules):
+  silent noautocmd new testfile.pl
+
+  let g:ale_perl_perlcritic_showrules = 0
+
+  AssertEqual
+  \ "perlcritic --verbose '". '%l:%c %m\n' . "' --nocolor",
+  \ ale_linters#perl#perlcritic#GetCommand(bufnr(''))
+
+  let g:ale_perl_perlcritic_showrules = 1
+
+  AssertEqual
+  \ "perlcritic --verbose '". '%l:%c %m [%p]\n' . "' --nocolor",
+  \ ale_linters#perl#perlcritic#GetCommand(bufnr(''))
+
+  :q