feat: finish YouTube downloading; primitive "raw" archiving

src/hash.rs

@@ -0,0 +1,17 @@
+use sha3::{Digest, Sha3_256};
+use std::{fs::File, io::Read, path::Path};
+use anyhow::Result;
+
+pub fn hash_file(path: &Path) -> Result<String> {
+    let mut file = File::open(path)?;
+    let mut buf = Vec::new();
+    file.read_to_end(&mut buf)?;
+    Ok(hash(String::from_utf8_lossy(&buf).to_string()))
+}
+
+pub fn hash(path: String) -> String {
+    let mut hasher = Sha3_256::new();
+    hasher.update(path.as_bytes());
+    let result = hasher.finalize();
+    hex::encode(result)
+}