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---@param manifest string
---@return nil|string
local function parse_edition(manifest)
for line in io.lines(manifest) do
if line:match("^edition *=") then
local edition = line:match("%d+")
if edition then
return edition
end
end
end
end
---@type conform.FileFormatterConfig
return {
meta = {
url = "https://github.com/rust-lang/rustfmt",
description = "A tool for formatting rust code according to style guidelines.",
},
command = "rustfmt",
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
local manifest = vim.fs.find("Cargo.toml", { upward = true, path = ctx.dirname })[1]
if manifest then
edition = parse_edition(manifest)
end
if not edition then
edition = self.options.default_edition
end
table.insert(args, "--edition=" .. edition)
return args
end,
}
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