feat: add ocp-indent for OCaml formatting (#335)

README.md

@@ -249,6 +249,7 @@ You can view this list in vim with `:help conform-formatters`
 - [nixfmt](https://github.com/serokell/nixfmt) - nixfmt is a formatter for Nix code, intended to apply a uniform style.
 - [nixpkgs_fmt](https://github.com/nix-community/nixpkgs-fmt) - nixpkgs-fmt is a Nix code formatter for nixpkgs.
 - [ocamlformat](https://github.com/ocaml-ppx/ocamlformat) - Auto-formatter for OCaml code.
+- [ocp-indent](https://github.com/ocaml-ppx/ocamlformat) - Automatic indentation of OCaml source files.
 - [opa_fmt](https://www.openpolicyagent.org/docs/latest/cli/#opa-fmt) - Format Rego files using `opa fmt` command.
 - [packer_fmt](https://developer.hashicorp.com/packer/docs/commands/fmt) - The packer fmt Packer command is used to format HCL2 configuration files to a canonical format and style.
 - [pangu](https://github.com/vinta/pangu.py) - Insert whitespace between CJK and half-width characters.

doc/conform.txt

@@ -277,6 +277,7 @@ FORMATTERS                                                    *conform-formatter
          style.
 `nixpkgs_fmt` - nixpkgs-fmt is a Nix code formatter for nixpkgs.
 `ocamlformat` - Auto-formatter for OCaml code.
+`ocp-indent` - Automatic indentation of OCaml source files.
 `opa_fmt` - Format Rego files using `opa fmt` command.
 `packer_fmt` - The packer fmt Packer command is used to format HCL2
              configuration files to a canonical format and style.

lua/conform/formatters/ocp-indent.lua

@@ -0,0 +1,8 @@
+---@type conform.FileFormatterConfig
+return {
+  meta = {
+    url = "https://github.com/OCamlPro/ocp-indent",
+    description = "Automatic indentation of OCaml source files.",
+  },
+  command = "ocp-indent",
+}