Initial divergences from upstream (#1)

src/internal/core.rs

@@ -25,7 +25,8 @@ pub struct State<P: Package, VS: VersionSet, Priority: Ord + Clone> {
     root_package: P,
     root_version: VS::V,
 
-    incompatibilities: Map<P, Vec<IncompId<P, VS>>>,
+    /// All incompatibilities indexed by package.
+    pub incompatibilities: Map<P, Vec<IncompId<P, VS>>>,
 
     /// Store the ids of incompatibilities that are already contradicted.
     /// For each one keep track of the decision level when it was found to be contradicted.

src/internal/incompatibility.rs

@@ -34,14 +34,16 @@ use crate::version_set::VersionSet;
 #[derive(Debug, Clone)]
 pub struct Incompatibility<P: Package, VS: VersionSet> {
     package_terms: SmallMap<P, Term<VS>>,
-    kind: Kind<P, VS>,
+    /// The reason for the incompatibility.
+    pub kind: Kind<P, VS>,
 }
 
 /// Type alias of unique identifiers for incompatibilities.
 pub type IncompId<P, VS> = Id<Incompatibility<P, VS>>;
 
+/// The reason for the incompatibility.
 #[derive(Debug, Clone)]
-enum Kind<P: Package, VS: VersionSet> {
+pub enum Kind<P: Package, VS: VersionSet> {
     /// Initial incompatibility aiming at picking the root package for the first decision.
     NotRoot(P, VS::V),
     /// There are no versions in the given range for this package.
@@ -123,6 +125,8 @@ impl<P: Package, VS: VersionSet> Incompatibility<P, VS> {
         }
     }
 
+    /// Return the two packages where this incompatibility when the incompatibility was created
+    /// through a dependency edge between the two.
     pub fn as_dependency(&self) -> Option<(&P, &P)> {
         match &self.kind {
             Kind::FromDependencyOf(p1, _, p2, _) => Some((p1, p2)),

src/internal/partial_solution.rs

@@ -257,6 +257,24 @@ impl<P: Package, VS: VersionSet, Priority: Ord + Clone> PartialSolution<P, VS, P
         }
     }
 
+    pub fn prioritized_packages(&self) -> impl Iterator<Item = (&P, &VS)> {
+        let check_all = self.changed_this_decision_level
+            == self.current_decision_level.0.saturating_sub(1) as usize;
+        let current_decision_level = self.current_decision_level;
+        self.package_assignments
+            .get_range(self.changed_this_decision_level..)
+            .unwrap()
+            .iter()
+            .filter(move |(_, pa)| {
+                // We only actually need to update the package if its Been changed
+                // since the last time we called prioritize.
+                // Which means it's highest decision level is the current decision level,
+                // or if we backtracked in the mean time.
+                check_all || pa.highest_decision_level == current_decision_level
+            })
+            .filter_map(|(p, pa)| pa.assignments_intersection.potential_package_filter(p))
+    }
+
     pub fn pick_highest_priority_pkg(
         &mut self,
         prioritizer: impl Fn(&P, &VS) -> Priority,

src/lib.rs

@@ -221,6 +221,7 @@
 //! do not exist in your cache.
 
 #![warn(missing_docs)]
+#![allow(clippy::all, unreachable_pub)]
 
 pub mod error;
 pub mod package;

src/range.rs

@@ -217,7 +217,7 @@ impl<V: Ord> Range<V> {
                 .segments
                 .last()
                 .expect("if there is a first element, there must be a last element");
-            (start.as_ref(), end.1.as_ref())
+            (bound_as_ref(start), bound_as_ref(&end.1))
         })
     }
 
@@ -335,6 +335,15 @@ fn within_bounds<V: PartialOrd>(v: &V, segment: &Interval<V>) -> Ordering {
     Ordering::Greater
 }
 
+/// Implementation of [`Bound::as_ref`] which is currently marked as unstable.
+fn bound_as_ref<V>(bound: &Bound<V>) -> Bound<&V> {
+    match bound {
+        Included(v) => Included(v),
+        Excluded(v) => Excluded(v),
+        Unbounded => Unbounded,
+    }
+}
+
 fn valid_segment<T: PartialOrd>(start: &Bound<T>, end: &Bound<T>) -> bool {
     match (start, end) {
         (Included(s), Included(e)) => s <= e,
@@ -561,7 +570,7 @@ impl<V: Display + Eq> Display for Range<V> {
         } else {
             for (idx, segment) in self.segments.iter().enumerate() {
                 if idx > 0 {
-                    write!(f, " | ")?;
+                    write!(f, ", ")?;
                 }
                 match segment {
                     (Unbounded, Unbounded) => write!(f, "*")?,
@@ -570,9 +579,9 @@ impl<V: Display + Eq> Display for Range<V> {
                     (Included(v), Unbounded) => write!(f, ">={v}")?,
                     (Included(v), Included(b)) => {
                         if v == b {
-                            write!(f, "{v}")?
+                            write!(f, "=={v}")?
                         } else {
-                            write!(f, ">={v}, <={b}")?
+                            write!(f, ">={v},<={b}")?
                         }
                     }
                     (Included(v), Excluded(b)) => write!(f, ">={v}, <{b}")?,

src/solver.rs

@@ -75,8 +75,8 @@ use std::convert::Infallible;
 use std::error::Error;
 
 use crate::error::PubGrubError;
-use crate::internal::core::State;
-use crate::internal::incompatibility::Incompatibility;
+pub use crate::internal::core::State;
+pub use crate::internal::incompatibility::{Incompatibility, Kind};
 use crate::package::Package;
 use crate::type_aliases::{DependencyConstraints, Map, SelectedDependencies};
 use crate::version_set::VersionSet;

src/term.rs

@@ -64,7 +64,7 @@ impl<VS: VersionSet> Term<VS> {
 
     /// Unwrap the set contained in a positive term.
     /// Will panic if used on a negative set.
-    pub(crate) fn unwrap_positive(&self) -> &VS {
+    pub fn unwrap_positive(&self) -> &VS {
         match self {
             Self::Positive(set) => set,
             _ => panic!("Negative term cannot unwrap positive set"),

tests/examples.rs

@@ -231,12 +231,12 @@ fn confusing_with_lots_of_holes() {
     };
     assert_eq!(
         &DefaultStringReporter::report(&derivation_tree),
-        r#"Because there is no available version for bar and foo 1 | 2 | 3 | 4 | 5 depends on bar, foo 1 | 2 | 3 | 4 | 5 is forbidden.
-And because there is no version of foo in <1 | >1, <2 | >2, <3 | >3, <4 | >4, <5 | >5 and root 1 depends on foo, root 1 is forbidden."#
+        r#"Because there is no available version for bar and foo ==1, ==2, ==3, ==4, ==5 depends on bar, foo ==1, ==2, ==3, ==4, ==5 is forbidden.
+And because there is no version of foo in <1, >1, <2, >2, <3, >3, <4, >4, <5, >5 and root ==1 depends on foo, root ==1 is forbidden."#
     );
     derivation_tree.collapse_no_versions();
     assert_eq!(
         &DefaultStringReporter::report(&derivation_tree),
-        "Because foo depends on bar and root 1 depends on foo, root 1 is forbidden."
+        "Because foo depends on bar and root ==1 depends on foo, root ==1 is forbidden."
     );
 }