add ocamlformat support

autoload/ale/fix/registry.vim

@@ -180,6 +180,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['haskell'],
 \       'description': 'Refactor Haskell files with stylish-haskell.',
 \   },
+\   'ocamlformat': {
+\       'function': 'ale#fixers#ocamlformat#Fix',
+\       'suggested_filetypes': ['ocaml'],
+\       'description': 'Fix OCaml files with ocamlformat.',
+\   },
 \   'refmt': {
 \       'function': 'ale#fixers#refmt#Fix',
 \       'suggested_filetypes': ['reason'],

autoload/ale/fixers/ocamlformat.vim

@@ -0,0 +1,18 @@
+" Author: Stephen Lumenta <@sbl>
+" Description: Integration of ocamlformat with ALE.
+
+call ale#Set('ocaml_ocamlformat_executable', 'ocamlformat')
+call ale#Set('ocaml_ocamlformat_options', '')
+
+function! ale#fixers#ocamlformat#Fix(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'ocaml_ocamlformat_executable')
+    let l:options = ale#Var(a:buffer, 'ocaml_ocamlformat_options')
+
+    return {
+    \   'command': ale#Escape(l:executable)
+    \       . (empty(l:options) ? '' : ' ' . l:options)
+    \       . ' --inplace'
+    \       . ' %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction