factor this code with run

[github-actions]

Line: 78

gyromouse//src/main.rs

Lines 75 to 85 in 2f32632

	match opts.cmd {
	Some(opts::Cmd::Validate(v)) => {
	// TODO: factor this code with run
	let mut content_file = File::open(&v.mapping_file)
	.with_context(|| format!("opening config file {:?}", v.mapping_file))?;
	let content = {
	let mut buf = String::new();
	content_file.read_to_string(&mut buf)?;
	buf
	};