Add puppet-lint fixer (#701)

* Add puppet-lint fixer

* Add vader test for puppetlint fixer

* Ensure puppetlint variables are initialized

autoload/ale/fix/registry.vim

@@ -32,6 +32,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['javascript'],
 \       'description': 'Apply prettier-eslint to a file.',
 \   },
+\   'puppetlint': {
+\       'function': 'ale#fixers#puppetlint#Fix',
+\       'suggested_filetypes': ['puppet'],
+\       'description': 'Run puppet-lint -f on a file.',
+\   },
 \   'remove_trailing_lines': {
 \       'function': 'ale#fixers#generic#RemoveTrailingBlankLines',
 \       'suggested_filetypes': [],

autoload/ale/fixers/puppetlint.vim

@@ -0,0 +1,21 @@
+" Author: Alexander Olofsson <alexander.olofsson@liu.se>
+" Description: puppet-lint fixer
+
+if !exists('g:ale_puppet_puppetlint_executable')
+    let g:ale_puppet_puppetlint_executable = 'puppet-lint'
+endif
+if !exists('g:ale_puppet_puppetlint_options')
+    let g:ale_puppet_puppetlint_options = ''
+endif
+
+function! ale#fixers#puppetlint#Fix(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'puppet_puppetlint_executable')
+
+    return {
+    \   'command': ale#Escape(l:executable)
+    \       . ' ' . ale#Var(a:buffer, 'puppet_puppetlint_options')
+    \       . ' --fix'
+    \       . ' %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction