surma
4b27e9afd5
Local workflow, smart-HTTP clone/fetch/push and public HTTPS clone/fetch match native git in stdout and exit codes. Only WASI imports (wasi:http, exit-with-code).
63 lines
1.7 KiB
Rust
63 lines
1.7 KiB
Rust
use crate::find;
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use gix_error::Result;
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/// A way to obtain object properties without fully decoding it.
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pub trait Header {
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/// Try to read the header of the object associated with `id` or return `None` if it could not be found.
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fn try_header(&self, id: &gix_hash::oid) -> Result<Option<find::Header>>;
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}
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mod _impls {
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use gix_error::Result;
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use std::{ops::Deref, rc::Rc, sync::Arc};
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use gix_hash::oid;
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use crate::find::Header;
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impl<T> crate::Header for &T
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where
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T: crate::Header,
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{
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fn try_header(&self, id: &oid) -> Result<Option<Header>> {
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(*self).try_header(id)
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}
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}
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impl<T> crate::Header for Rc<T>
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where
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T: crate::Header,
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{
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fn try_header(&self, id: &oid) -> Result<Option<Header>> {
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self.deref().try_header(id)
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}
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}
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impl<T> crate::Header for Arc<T>
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where
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T: crate::Header,
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{
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fn try_header(&self, id: &oid) -> Result<Option<Header>> {
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self.deref().try_header(id)
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}
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}
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}
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mod ext {
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use gix_error::{OptionExt, Result};
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use crate::find;
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/// An extension trait with convenience functions.
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pub trait HeaderExt: super::Header {
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/// Like [`try_header(…)`][super::Header::try_header()], but flattens the `Result<Option<_>>` into a single `Result` making a non-existing object an error.
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fn header(&self, id: impl AsRef<gix_hash::oid>) -> Result<find::Header> {
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let id = id.as_ref();
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self.try_header(id)?
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.ok_or_raise(|| gix_error::message!("An object with id {id} could not be found").not_found())
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}
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}
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impl<T: super::Header> HeaderExt for T {}
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}
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pub use ext::HeaderExt;
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