Add puppet linters (#183)

* Start adding Puppet linters

* Use the correct output stream for puppet parser

* Finish Puppet and puppet-lint linters

* Add Puppet information to documentation

ale_linters/puppet/puppet.vim

@@ -0,0 +1,38 @@
+" Author: Alexander Olofsson <alexander.olofsson@liu.se>
+
+function! ale_linters#puppet#puppet#Handle(buffer, lines)
+    " Matches patterns like the following:
+    " Error: Could not parse for environment production: Syntax error at ':' at /root/puppetcode/modules/nginx/manifests/init.pp:43:12
+
+    let l:pattern = '^Error: .*: \(.\+\) at .\+:\(\d\+\):\(\d\+\)$'
+    let l:output = []
+
+    for l:line in a:lines
+        let l:match = matchlist(l:line, l:pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        " vcol is needed to indicate that the column is a character
+        call add(l:output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[2] + 0,
+        \   'vcol': 0,
+        \   'col': l:match[3] + 0,
+        \   'text': l:match[1],
+        \   'type': 'E',
+        \   'nr': -1,
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('puppet', {
+\   'name': 'puppet',
+\   'executable': 'puppet',
+\   'output_stream': 'stderr',
+\   'command': g:ale#util#stdin_wrapper . ' .pp puppet parser validate --color=false',
+\   'callback': 'ale_linters#puppet#puppet#Handle',
+\})

ale_linters/puppet/puppetlint.vim

@@ -0,0 +1,8 @@
+" Author: Alexander Olofsson <alexander.olofsson@liu.se>
+
+call ale#linter#Define('puppet', {
+\   'name': 'puppetlint',
+\   'executable': 'puppet-lint',
+\   'command': g:ale#util#stdin_wrapper . ' .pp puppet-lint --no-autoloader_layout-check --log-format "-:%{line}:%{column}: %{kind}: [%{check}] %{message}"',
+\   'callback': 'ale#handlers#HandleGCCFormat',
+\})