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main: strip nix store paths

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the paths we match with regex are always prefixed
with /nix/store/<...>-, which amounts to 44 chars.
Since this is always the same, we can just strip
these 44 chars before matching with regex.

This reduces both complexity of the regex and performance.
This commit is contained in:
Bloxx12 2025-05-06 12:29:52 +02:00
parent c180c26bf5
commit d0e538b1fb
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1 changed files with 8 additions and 2 deletions
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10
src/main.rs
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@ -254,7 +254,7 @@ fn main() {
fn store_path_regex() -> &'static Regex {
static REGEX: OnceLock<Regex> = OnceLock::new();
REGEX.get_or_init(|| {
Regex::new(r"^/nix/store/[a-z0-9]+-(.+?)-([0-9].*?)$")
Regex::new(r"(.+?)-([0-9].*?)$")
.expect("Failed to compile regex pattern for nix store paths")
})
}
@ -263,8 +263,14 @@ fn store_path_regex() -> &'static Regex {
fn get_version<'a>(pack: impl Into<&'a str>) -> Result<(&'a str, &'a str)> {
let path = pack.into();
// We can strip the path since it _always_ starts with
// /nix/store/....-
// This part is exactly 44 chars long, so we just remove it.
let stripped_path = &path[44..];
debug!("Stripped path: {stripped_path}");
// Match the regex against the input
if let Some(cap) = store_path_regex().captures(path) {
if let Some(cap) = store_path_regex().captures(stripped_path) {
// Handle potential missing captures safely
let name = cap.get(1).map_or("", |m| m.as_str());
let version = cap.get(2).map_or("", |m| m.as_str());