-- Return the project's go module path from go.mod, or an empty string if the file cannot be read.
function Get_project_go_module_path()
	local root_path = vim.fn.getcwd()
	local mod_path = root_path .. "/go.mod"
	if vim.fn.filereadable(mod_path) == 0 then
		return ""
	end

	local file = io.open(mod_path, "r")
	if file == nil then
		return ""
	end

	io.input(file)
	-- The first line of go.mod, something like:
	-- module github.com/username/repo
	local line = io.read()
	io.close(file)

	local match = string.match(line, "^module (.+)")
	if match == nil then
		return ""
	end

	return match
end