Add ansible-lint support and factor out PEP8 handler

autoload/ale/handlers.vim

@@ -103,6 +103,43 @@ function! ale#handlers#HandleCppCheckFormat(buffer, lines) abort
 
 endfunction
 
+function! ale#handlers#HandlePEP8Format(buffer, lines)
+    " Matches patterns line the following:
+    "
+    " Matches patterns line the following:
+    "
+    " stdin:6:6: E111 indentation is not a multiple of four
+    " test.yml:35: [EANSIBLE0002] Trailing whitespace
+    let l:pattern = '^' . s:path_pattern . ':\(\d\+\):\?\(\d\+\)\?: \[\?\(\([[:alpha:]]\)[[:alnum:]]\+\)\]\? \(.*\)$'
+    let l:output = []
+
+    for l:line in a:lines
+        let l:match = matchlist(l:line, l:pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        let l:code = l:match[3]
+        if (l:code ==# 'W291' || l:code ==# 'W293' || l:code ==# 'EANSIBLE002')
+                    \ && !g:ale_warn_about_trailing_whitespace
+            " Skip warnings for trailing whitespace if the option is off.
+            continue
+        endif
+
+        call add(l:output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[1] + 0,
+        \   'vcol': 0,
+        \   'col': l:match[2] + 0,
+        \   'text': l:code . ': ' . l:match[5],
+        \   'type': l:match[4] ==# 'E' ? 'E' : 'W',
+        \   'nr': -1,
+        \})
+    endfor
+
+    return l:output
+endfunction
 
 function! ale#handlers#HandleCSSLintFormat(buffer, lines) abort
     " Matches patterns line the following: