feat: range formatting

Should work the same as vim.lsp.buf.format(). Additionally, range
formatting is supported for *any* formatter. If the formatter doesn't
have native support for ranges, conform will do its best to only apply the
diffs that affect that range.

1 files changed, 14 insertions, 1 deletions

diff --git a/lua/conform/formatters/stylua.lua b/lua/conform/formatters/stylua.lua
index ac482bd..d971932 100644
--- a/lua/conform/formatters/stylua.lua
+++ b/lua/conform/formatters/stylua.lua
@@ -1,5 +1,5 @@
 local util = require("conform.util")
----@type conform.FormatterConfig
+---@type conform.FileFormatterConfig
 return {
   meta = {
     url = "https://github.com/JohnnyMorganz/StyLua",
@@ -7,6 +7,19 @@ return {
   },
   command = "stylua",
   args = { "--search-parent-directories", "--stdin-filepath", "$FILENAME", "-" },
+  range_args = function(ctx)
+    local start_offset, end_offset = util.get_offsets_from_range(ctx.buf, ctx.range)
+    return {
+      "--search-parent-directories",
+      "--stdin-filepath",
+      "$FILENAME",
+      "--range-start",
+      tostring(start_offset),
+      "--range-end",
+      tostring(end_offset),
+      "-",
+    }
+  end,
   cwd = util.root_file({
     ".stylua.toml",
     "stylua.toml",