Add rufo fixer for ruby files

autoload/ale/fix/registry.vim

@@ -84,6 +84,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['ruby'],
 \       'description': 'Fix ruby files with rubocop --auto-correct.',
 \   },
+\   'rufo': {
+\       'function': 'ale#fixers#rufo#Fix',
+\       'suggested_filetypes': ['ruby'],
+\       'description': 'Fix ruby files with rufo',
+\   },
 \   'standard': {
 \       'function': 'ale#fixers#standard#Fix',
 \       'suggested_filetypes': ['javascript'],

autoload/ale/fixers/rufo.vim

@@ -0,0 +1,20 @@
+" Author: Fohte (Hayato Kawai) https://github.com/fohte
+" Description: Integration of Rufo with ALE.
+
+call ale#Set('ruby_rufo_executable', 'rufo')
+
+function! ale#fixers#rufo#GetCommand(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'ruby_rufo_executable')
+    let l:exec_args = l:executable =~? 'bundle$'
+    \   ? ' exec rufo'
+    \   : ''
+
+    return ale#Escape(l:executable) . l:exec_args . ' %t'
+endfunction
+
+function! ale#fixers#rufo#Fix(buffer) abort
+    return {
+    \   'command': ale#fixers#rufo#GetCommand(a:buffer),
+    \   'read_temporary_file': 1,
+    \}
+endfunction