radicle_cob/
trailers.rs

1// Copyright © 2019-2020 The Radicle Foundation <hello@radicle.foundation>
2
3use git_ext::commit::trailers::{OwnedTrailer, Token, Trailer};
4use std::ops::Deref as _;
5
6pub mod error {
7    use thiserror::Error;
8
9    #[derive(Debug, Error)]
10    pub enum InvalidResourceTrailer {
11        #[error("found wrong token for Rad-Resource tailer")]
12        WrongToken,
13        #[error("no value for Rad-Resource")]
14        NoValue,
15        #[error("invalid git OID")]
16        InvalidOid,
17    }
18}
19
20/// Commit trailer for COB commits.
21pub enum CommitTrailer {
22    /// Points to the owning resource.
23    Resource(git2::Oid),
24    /// Points to a related change.
25    Related(git2::Oid),
26}
27
28impl CommitTrailer {
29    pub fn oid(&self) -> git2::Oid {
30        match self {
31            Self::Resource(oid) => *oid,
32            Self::Related(oid) => *oid,
33        }
34    }
35}
36
37impl TryFrom<&Trailer<'_>> for CommitTrailer {
38    type Error = error::InvalidResourceTrailer;
39
40    fn try_from(Trailer { value, token }: &Trailer<'_>) -> Result<Self, Self::Error> {
41        let ext_oid =
42            git_ext::Oid::try_from(value.as_ref()).map_err(|_| Self::Error::InvalidOid)?;
43        if token.deref() == "Rad-Resource" {
44            Ok(CommitTrailer::Resource(ext_oid.into()))
45        } else if token.deref() == "Rad-Related" {
46            Ok(CommitTrailer::Related(ext_oid.into()))
47        } else {
48            Err(Self::Error::WrongToken)
49        }
50    }
51}
52
53impl TryFrom<&OwnedTrailer> for CommitTrailer {
54    type Error = error::InvalidResourceTrailer;
55
56    fn try_from(trailer: &OwnedTrailer) -> Result<Self, Self::Error> {
57        Self::try_from(&Trailer::from(trailer))
58    }
59}
60
61impl From<CommitTrailer> for Trailer<'_> {
62    fn from(t: CommitTrailer) -> Self {
63        match t {
64            #[allow(clippy::unwrap_used)]
65            CommitTrailer::Related(oid) => {
66                Trailer {
67                    // SAFETY: "Rad-Related" is a valid `Token`.
68                    token: Token::try_from("Rad-Related").unwrap(),
69                    value: oid.to_string().into(),
70                }
71            }
72            #[allow(clippy::unwrap_used)]
73            CommitTrailer::Resource(oid) => {
74                Trailer {
75                    // SAFETY: "Rad-Resource" is a valid `Token`.
76                    token: Token::try_from("Rad-Resource").unwrap(),
77                    value: oid.to_string().into(),
78                }
79            }
80        }
81    }
82}
83
84impl From<CommitTrailer> for OwnedTrailer {
85    fn from(containing: CommitTrailer) -> Self {
86        Trailer::from(containing).to_owned()
87    }
88}
radicle_cob/trailers.rs

radicle_cob/
trailers.rs
