117 lines
3.7 KiB
Rust
117 lines
3.7 KiB
Rust
// Copyright © 2019-2020 The Radicle Foundation <hello@radicle.foundation>
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//
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// This file is part of radicle-link, distributed under the GPLv3 with Radicle
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// Linking Exception. For full terms see the included LICENSE file.
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mod author_commit {
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super::oid_trailer! {AuthorCommitTrailer, "Rad-Author"}
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}
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mod resource_identity {
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super::oid_trailer! {ResourceCommitTrailer, "Rad-Resource"}
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}
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pub mod error {
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pub use super::author_commit::Error as InvalidAuthorTrailer;
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pub use super::resource_identity::Error as InvalidResourceTrailer;
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}
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pub use author_commit::AuthorCommitTrailer;
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pub use resource_identity::ResourceCommitTrailer;
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/// A macro for generating boilerplate From and TryFrom impls for trailers which
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/// have git object IDs as their values
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#[macro_export]
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macro_rules! oid_trailer {
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($typename:ident, $trailer:literal) => {
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use git_trailers::{OwnedTrailer, Token, Trailer};
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use radicle_git_ext as ext;
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use std::convert::{TryFrom, TryInto};
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#[derive(Debug)]
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pub enum Error {
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WrongToken,
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NoTrailer,
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NoValue,
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InvalidOid,
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}
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// We can't use `derive(thiserror::Error)` as we need to concat strings with
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// $trailer and macros are not allowed in non-key-value attributes
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impl std::fmt::Display for Error {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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Self::WrongToken => {
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write!(f, concat!("found wrong token for ", $trailer, " trailer"))
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}
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Self::NoTrailer => write!(f, concat!("no ", $trailer)),
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Self::NoValue => write!(f, concat!("no value for ", $trailer, " trailer")),
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Self::InvalidOid => write!(f, "invalid git OID"),
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}
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}
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}
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impl std::error::Error for Error {}
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pub struct $typename(git2::Oid);
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impl $typename {
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pub fn oid(&self) -> git2::Oid {
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self.0
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}
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}
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impl From<git2::Oid> for $typename {
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fn from(oid: git2::Oid) -> Self {
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$typename(oid)
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}
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}
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impl From<$typename> for Trailer<'_> {
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fn from(containing: $typename) -> Self {
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Trailer {
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token: Token::try_from($trailer).unwrap(),
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values: vec![containing.0.to_string().into()],
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}
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}
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}
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impl From<$typename> for OwnedTrailer {
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fn from(containing: $typename) -> Self {
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Trailer::from(containing).to_owned()
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}
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}
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impl TryFrom<&Trailer<'_>> for $typename {
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type Error = Error;
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fn try_from(Trailer { values, token }: &Trailer<'_>) -> Result<Self, Self::Error> {
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let val = values.first().ok_or(Error::NoValue)?;
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let ext_oid =
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radicle_git_ext::Oid::try_from(val.as_ref()).map_err(|_| Error::InvalidOid)?;
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if Some(token) == Token::try_from($trailer).ok().as_ref() {
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Ok($typename(ext_oid.into()))
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} else {
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Err(Error::WrongToken)
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}
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}
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}
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impl TryFrom<&OwnedTrailer> for $typename {
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type Error = Error;
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fn try_from(trailer: &OwnedTrailer) -> Result<Self, Self::Error> {
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(&Trailer::from(trailer)).try_into()
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}
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}
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impl From<ext::Oid> for $typename {
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fn from(oid: ext::Oid) -> Self {
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$typename(oid.into())
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}
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}
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};
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}
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pub(crate) use oid_trailer;
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