Mercurial > hg
view rust/hg-core/src/lib.rs @ 41348:2f54f31c41aa stable
rust: working directory revision number constant
This introduces the constant, but does not use it anywhere yet.
author | Georges Racinet <georges.racinet@octobus.net> |
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date | Wed, 23 Jan 2019 07:39:27 -0500 |
parents | 47881d2a9d99 |
children | ee943a920606 |
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// Copyright 2018 Georges Racinet <gracinet@anybox.fr> // // This software may be used and distributed according to the terms of the // GNU General Public License version 2 or any later version. mod ancestors; pub mod dagops; pub use ancestors::{AncestorsIterator, LazyAncestors, MissingAncestors}; #[cfg(test)] pub mod testing; /// Mercurial revision numbers /// /// As noted in revlog.c, revision numbers are actually encoded in /// 4 bytes, and are liberally converted to ints, whence the i32 pub type Revision = i32; pub const NULL_REVISION: Revision = -1; /// Same as `mercurial.node.wdirrev` /// /// This is also equal to `i32::max_value()`, but it's better to spell /// it out explicitely, same as in `mercurial.node` pub const WORKING_DIRECTORY_REVISION: Revision = 0x7fffffff; /// The simplest expression of what we need of Mercurial DAGs. pub trait Graph { /// Return the two parents of the given `Revision`. /// /// Each of the parents can be independently `NULL_REVISION` fn parents(&self, Revision) -> Result<[Revision; 2], GraphError>; } #[derive(Clone, Debug, PartialEq)] pub enum GraphError { ParentOutOfRange(Revision), }