feat: add Oxfmt (#818)

* feat: add Oxfmt

* docs: Add reference to Oxfmt in readme

* fix: cwd detection

without cwd detection configuration files would be ignored in subdirectories

* doc: simplify description of Oxfmt

---------

Co-authored-by: Steven Arcangeli <[email protected]>

Author: FLchs

README.md

@@ -327,6 +327,7 @@ You can view this list in vim with `:help conform-formatters`
 - [odinfmt](https://github.com/DanielGavin/ols) - Auto-formatter for the Odin programming language.
 - [opa_fmt](https://www.openpolicyagent.org/docs/latest/cli/#opa-fmt) - Format Rego files using `opa fmt` command.
 - [ormolu](https://hackage.haskell.org/package/ormolu) - A formatter for Haskell source code.
+- [oxfmt](https://github.com/oxc-project/oxc) - Prettier-compatible code formatter.
 - [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.
 - [perlimports](https://github.com/perl-ide/App-perlimports) - Make implicit Perl imports explicit.

lua/conform/formatters/oxfmt.lua

@@ -0,0 +1,19 @@
+local util = require("conform.util")
+
+local config_file_names = {
+  -- https://oxc.rs/docs/guide/usage/formatter.html#configuration-file
+  ".oxfmtrc.json",
+  ".oxfmtrc.jsonc",
+}
+
+---@type conform.FileFormatterConfig
+return {
+  meta = {
+    url = "https://github.com/oxc-project/oxc",
+    description = "A Prettier-compatible code formatter.",
+  },
+  command = util.from_node_modules("oxfmt"),
+  args = { "$FILENAME" },
+  stdin = false,
+  cwd = require("conform.util").root_file(config_file_names),
+}