use crate::Spec; /// How to interpret a revision specification, or `revspec`.#[derive(Debug, Copy, Clone, PartialOrd, PartialEq, Ord, Eq, Hash)]#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]pub enum Kind {    /// Include commits reachable from this revision, the default when parsing revision `a` for example, i.e. `a` and its ancestors.    /// Example: `a`.    IncludeReachable,    /// Exclude commits reachable from this revision, i.e. `a` and its ancestors. Example: `^a`.    ExcludeReachable,    /// Every commit that is reachable from `b` but not from `a`. Example: `a..b`.    RangeBetween,    /// Every commit reachable through either `a` or `b` but no commit that is reachable by both. Example: `a...b`.    ReachableToMergeBase,    /// Include every commit of all parents of `a`, but not `a` itself. Example: `a^@`.    IncludeReachableFromParents,    /// Exclude every commit of all parents of `a`, but not `a` itself. Example: `a^!`.    ExcludeReachableFromParents,} impl Default for Kind {    fn default() -> Self {        Kind::IncludeReachable    }} impl Spec {    /// Return the kind of this specification.    pub fn kind(&self) -> Kind {        match self {            Spec::Include(_) => Kind::IncludeReachable,            Spec::Exclude(_) => Kind::ExcludeReachable,            Spec::Range { .. } => Kind::RangeBetween,            Spec::Merge { .. } => Kind::ReachableToMergeBase,            Spec::IncludeOnlyParents { .. } => Kind::IncludeReachableFromParents,            Spec::ExcludeParents { .. } => Kind::ExcludeReachableFromParents,        }    }} mod _impls {    use std::fmt::{Display, Formatter};     use crate::Spec;     impl Display for Spec {        fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {            match self {                Spec::Include(oid) => Display::fmt(oid, f),                Spec::Exclude(oid) => write!(f, "^{oid}"),                Spec::Range { from, to } => write!(f, "{from}..{to}"),                Spec::Merge { theirs, ours } => write!(f, "{theirs}...{ours}"),                Spec::IncludeOnlyParents(from_exclusive) => write!(f, "{from_exclusive}^@"),                Spec::ExcludeParents(oid) => write!(f, "{oid}^!"),            }        }    }} ///pub mod parse;pub use parse::function::parse;