feat: add support for yew-fmt (#398)

* feat: add support for yew-fmt

Should close #314 :)

* refactor: copy rustfmt to yew-fmt

* fix: use correct default_edition

* refactor: extract Cargo.toml parsing into utility function

* refactor: yew-fmt doesn't rely directly on rustfmt definition

---------

Co-authored-by: Steven Arcangeli <stevearc@stevearc.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/lua/conform/formatters/yew-fmt.lua b/lua/conform/formatters/yew-fmt.lua
new file mode 100644
index 0000000..f441fdf
--- /dev/null
+++ b/lua/conform/formatters/yew-fmt.lua
@@ -0,0 +1,21 @@
+local util = require("conform.util")
+
+---@type conform.FileFormatterConfig
+return {
+  meta = {
+    url = "https://github.com/schvv31n/yew-fmt",
+    description = "Code formatter for the Yew framework.",
+  },
+  command = "yew-fmt",
+  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 edition = util.parse_rust_edition(ctx.dirname) or self.options.default_edition
+    table.insert(args, "--edition=" .. edition)
+
+    return args
+  end,
+}