Add linter yamllint for yaml

README.md

@@ -36,6 +36,7 @@ name. That seems to be the fairest way to arrange this table.
 | Python | [flake8](http://flake8.pycqa.org/en/latest/) |
 | Ruby   | [rubocop](https://github.com/bbatsov/rubocop) |
 | Vim | [vint](https://github.com/Kuniwak/vint)^ |
+| Yaml | [yamllint](https://yamllint.readthedocs.io/)^ |
 
 *^ Supported only on Unix machines via a wrapper script.*
 

ale_linters/yaml/yamllint.vim

@@ -0,0 +1,48 @@
+" Author: KabbAmine <amine.kabb@gmail.com>
+
+if exists('g:loaded_ale_linters_yaml_yamllint')
+    finish
+endif
+
+let g:loaded_ale_linters_yaml_yamllint = 1
+
+function! ale_linters#yaml#yamllint#Handle(buffer, lines)
+    " Matches patterns line the following:
+    " something.yaml: line 2, col 1, Error - Expected RBRACE at line 2, col 1. (errors)
+    "
+    let pattern = '^.*:\(\d\+\):\(\d\+\): \[\(error\|warning\)\] \(.\+\)$'
+    let output = []
+
+    for line in a:lines
+        let l:match = matchlist(line, pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        let line = match[1] + 0
+        let col = match[2] + 0
+        let type = match[3]
+        let text = printf('[%s]%s', type, match[4])
+
+        " vcol is Needed to indicate that the column is a character.
+        call add(output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': line,
+        \   'vcol': 0,
+        \   'col': col,
+        \   'text': text,
+        \   'type': type ==# 'warning' ? 'W' : 'E',
+        \   'nr': -1,
+        \})
+    endfor
+
+    return output
+endfunction
+
+call ALEAddLinter('yaml', {
+\   'name': 'yamllint',
+\   'executable': 'yamllint',
+\   'command': g:ale#util#stdin_wrapper . ' .yml yamllint -f parsable',
+\   'callback': 'ale_linters#yaml#yamllint#Handle',
+\})