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refactor(nix-compat/nixhash): use a bit more map and ok_or_else

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This looks more readable like this.

Change-Id: Iaa750fae66c7263612f169405eb7d38fb9541b04
Reviewed-on: https://cl.snix.dev/c/snix/+/30552
Autosubmit: Florian Klink <flokli@flokli.de>
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
Tested-by: besadii
This commit is contained in:
Florian Klink 2025-06-03 22:28:26 +03:00 • committed by clbot
parent 963546bd37
commit 7b6b94c5ca
1 changed files with 4 additions and 10 deletions
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14
snix/nix-compat/src/nixhash/mod.rs
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@ -210,11 +210,7 @@ pub enum Error {
/// one communicated out-of-band.
pub fn from_str(s: &str, algo_str: Option<&str>) -> NixHashResult<NixHash> {
// if algo_str is some, parse or bail out
let algo: Option<HashAlgo> = if let Some(algo_str) = algo_str {
Some(algo_str.try_into()?)
} else {
None
};
let algo: Option<HashAlgo> = algo_str.map(HashAlgo::try_from).transpose()?;
// Peek at the beginning of the string to detect SRI hashes.
if s.starts_with("sha1-")
@ -240,6 +236,7 @@ pub fn from_str(s: &str, algo_str: Option<&str>) -> NixHashResult<NixHash> {
|| s.starts_with("md5:")
{
let parsed_nixhash = from_nix_str(s)?;
// ensure the algo matches with what has been passed externally, if so.
if let Some(algo) = algo {
if algo != parsed_nixhash.algo() {
@ -250,11 +247,8 @@ pub fn from_str(s: &str, algo_str: Option<&str>) -> NixHashResult<NixHash> {
}
// Neither of these, assume a bare digest, so there MUST be an externally-passed algo.
match algo {
// Fail if there isn't.
None => Err(Error::MissingInlineHashAlgo(s.to_string())),
Some(algo) => decode_digest(s.as_bytes(), algo),
}
let algo = algo.ok_or_else(|| Error::MissingInlineHashAlgo(s.to_string()))?;
decode_digest(s.as_bytes(), algo)
}
/// Parses a Nix hash string ($algo:$digest) to a NixHash.