Add fixer definition for XO

autoload/ale/fixers/xo.vim

@@ -0,0 +1,23 @@
+" Author: Albert Marquez - https://github.com/a-marquez
+" Description: Fixing files with XO.
+
+call ale#Set('javascript_xo_executable', 'xo')
+call ale#Set('javascript_xo_use_global', get(g:, 'ale_use_global_executables', 0))
+call ale#Set('javascript_xo_options', '')
+
+function! ale#fixers#xo#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'javascript_xo', [
+    \   'node_modules/xo/cli.js',
+    \   'node_modules/.bin/xo',
+    \])
+endfunction
+
+function! ale#fixers#xo#Fix(buffer) abort
+    let l:executable = ale#fixers#xo#GetExecutable(a:buffer)
+
+    return {
+    \   'command': ale#node#Executable(a:buffer, l:executable)
+    \       . ' --fix %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction