Add support for Pug with pug-lint.

README.md

@@ -39,6 +39,7 @@ name. That seems to be the fairest way to arrange this table.
 | JavaScript | [eslint](http://eslint.org/), [jscs](http://jscs.info/), [jshint](http://jshint.com/) |
 | JSON | [jsonlint](http://zaa.ch/jsonlint/) |
 | PHP | [php -l](https://secure.php.net/), [phpcs](https://github.com/squizlabs/PHP_CodeSniffer) |
+| Pug | [pug-lint](https://github.com/pugjs/pug-lint) |
 | Python | [flake8](http://flake8.pycqa.org/en/latest/) |
 | Ruby   | [rubocop](https://github.com/bbatsov/rubocop) |
 | SASS | [sass-lint](https://www.npmjs.com/package/sass-lint) |

ale_linters/pug/puglint.vim

@@ -0,0 +1,44 @@
+" Author: w0rp - <devw0rp@gmail.com>
+" Description: pug-lint for checking Pug/Jade files.
+
+if exists('g:loaded_ale_linters_pug_puglint')
+    finish
+endif
+
+let g:loaded_ale_linters_pug_puglint = 1
+
+function! ale_linters#pug#puglint#Handle(buffer, lines)
+    " Matches patterns like the following:
+    "
+    " temp.jade:6:1 The end of the string reached with no closing bracket ) found.
+    let pattern = '^.\+:\(\d\+\):\(\d\+\) \(.\+\)$'
+    let output = []
+
+    for line in a:lines
+        let l:match = matchlist(line, pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        call add(output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[1] + 0,
+        \   'vcol': 0,
+        \   'col': l:match[2] + 0,
+        \   'text': l:match[3],
+        \   'type': 'E',
+        \   'nr': -1,
+        \})
+    endfor
+
+    return output
+endfunction
+
+call ALEAddLinter('pug', {
+\   'name': 'puglint',
+\   'executable': 'pug-lint',
+\   'output_stream': 'stderr',
+\   'command': g:ale#util#stdin_wrapper . ' .pug pug-lint -r inline',
+\   'callback': 'ale_linters#pug#puglint#Handle',
+\})

doc/ale.txt

@@ -52,6 +52,7 @@ The following languages and tools are supported.
 * JavaScript: 'eslint', 'jscs', 'jshint'
 * JSON: 'jsonlint'
 * PHP: 'php' (-l flag), 'phpcs'
+* Pug: 'pug-lint'
 * Python: 'flake8'
 * Ruby: 'rubocop'
 * SASS: 'sasslint'