script for toml reformatting

unsection.lua

-- script for removing the sections of toml files
-- and instead fully specifying each key.
--
-- in particular this is used for the migration of
-- rust-lang/rust bootstrap.example.toml

section = ""
for ln in io.input():lines() do
	local m = string.match(ln, "^%[([a-zA-Z0-9_.-]+)%]")
	if m then
		if string.match(m, "target.") then
			-- the target-specific section is not modified
			print(ln)
			section = ""
		else
			section = m .. "."
		end
	elseif string.match(ln, "^#?[a-zA-Z0-9_-]+ +=") then
		local h = string.match(ln, "^#")
		local s = string.gsub(ln, "^#", "")
		print(h..section..s)
	else
		print(ln)
	end
end