fix(rustfmt): use Cargo.toml settings and default to recent edition (#328)

1 files changed, 14 insertions, 1 deletions

diff --git a/lua/conform/formatters/rustfmt.lua b/lua/conform/formatters/rustfmt.lua
index d8f0f19..34fb09b 100644
--- a/lua/conform/formatters/rustfmt.lua
+++ b/lua/conform/formatters/rustfmt.lua
@@ -5,5 +5,18 @@ return {
     description = "A tool for formatting rust code according to style guidelines.",
   },
   command = "rustfmt",
-  args = { "--emit=stdout" },
+  options = {
+    -- The default edition of Rust to use when no Cargo.toml file is found
+    default_edition = "2021",
+  },
+  args = function(self, ctx)
+    local args = { "--emit=stdout" }
+    local manifest = vim.fs.find("Cargo.toml", { upward = true, path = ctx.dirname })[1]
+    if manifest then
+      table.insert(args, "--manifest-path=" .. manifest)
+    elseif self.options.default_edition then
+      table.insert(args, "--edition=" .. self.options.default_edition)
+    end
+    return args
+  end,
 }