From aada09c9cfea38187966ce47f34b9008e1104d21 Mon Sep 17 00:00:00 2001
From: Steven Arcangeli <stevearc@stevearc.com>
Date: Tue, 26 Sep 2023 09:34:49 -0700
Subject: feat: another utility for extending formatter arguments

---
 doc/recipes.md       |  3 +++
 lua/conform/util.lua | 14 ++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/doc/recipes.md b/doc/recipes.md
index 5aeaf47..66bc662 100644
--- a/doc/recipes.md
+++ b/doc/recipes.md
@@ -191,4 +191,7 @@ local deno_fmt = require("conform.formatters.deno_fmt")
 require("conform").formatters.deno_fmt = vim.tbl_deep_extend('force', deno_fmt, {
   args = util.extend_args(deno_fmt.args, { "--use-tabs" }, { append = true })
 })
+
+-- There is also a utility to modify a formatter in-place
+util.add_formatter_args(require("conform.formatters.prettier"), { "--tab", "--indent", "2" })
 ```
diff --git a/lua/conform/util.lua b/lua/conform/util.lua
index 5813736..959e88c 100644
--- a/lua/conform/util.lua
+++ b/lua/conform/util.lua
@@ -114,4 +114,18 @@ M.extend_args = function(args, extra_args, opts)
   end
 end
 
+---@param formatter conform.FormatterConfig
+---@param extra_args string|string[]|fun(ctx: conform.Context): string|string[]
+---@param opts? { append?: boolean }
+---@example
+--- local util = require("conform.util")
+--- local prettier = require("conform.formatters.prettier")
+--- util.add_formatter_args(prettier, { "--tab", "--indent", "2" })
+M.add_formatter_args = function(formatter, extra_args, opts)
+  formatter.args = M.extend_args(formatter.args, extra_args, opts)
+  if formatter.range_args then
+    formatter.range_args = M.extend_args(formatter.range_args, extra_args, opts)
+  end
+end
+
 return M
-- 
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