feat: Add pumpkin_solver solver

Cargo.toml

@@ -31,6 +31,7 @@ all_default_solvers = [
     "scip_bundled",
     "lp-solvers",
     "clarabel",
+    "pumpkin-solver",
 ] # cplex-rs is not included because it is incompatible with lpsolve
 minilp = [
     "microlp",
@@ -45,6 +46,7 @@ russcip = { version = "0.6.4", optional = true }
 lp-solvers = { version = "1.0.0", features = ["cplex"], optional = true }
 cplex-rs = { version = "0.1", optional = true }
 clarabel = { version = "0.10.0", optional = true, features = [] }
+pumpkin-solver = { version = "0.1.4", optional = true }
 fnv = "1.0.5"
 
 [dev-dependencies]
@@ -66,7 +68,7 @@ all-features = false
 # Use almost the same as all_default_solvers. Similarly, cplex-rs is not
 # included because it is incompatible with lpsolve. Additionally,
 # russcip/bundled is not included because network access is blocked on docs.rs.
-features = ["coin_cbc", "microlp", "lpsolve", "highs", "lp-solvers", "clarabel"]
+features = ["coin_cbc", "microlp", "lpsolve", "highs", "lp-solvers", "clarabel", "pumpkin-solver"]
 default-target = "x86_64-unknown-linux-gnu"
 targets = ["x86_64-unknown-linux-gnu"]
 rustdoc-args = ["--cfg", "docsrs"]

src/lib.rs

@@ -76,6 +76,7 @@ pub use expression::Expression;
     feature = "highs",
     feature = "scip",
     feature = "cplex-rs",
+    feature = "pumpkin-solver",
 )))]
 #[cfg(feature = "clarabel")]
 pub use solvers::clarabel::clarabel as default_solver;
@@ -120,6 +121,9 @@ pub use solvers::microlp::microlp;
 #[cfg(feature = "microlp")]
 /// When the "coin_cbc" cargo feature is absent, microlp is used as the default solver
 pub use solvers::microlp::microlp as default_solver;
+#[cfg(feature = "pumpkin-solver")]
+#[cfg_attr(docsrs, doc(cfg(feature = "pumpkin-solver")))]
+pub use solvers::pumpkin_solver::pumpkin;
 #[cfg(feature = "scip")]
 #[cfg_attr(docsrs, doc(cfg(feature = "highs")))]
 pub use solvers::scip::scip;
@@ -161,6 +165,7 @@ pub const default_solver: LpSolver<
     feature = "scip",
     feature = "cplex-rs",
     feature = "clarabel",
+    feature = "pumpkin-solver",
 )))]
 compile_error!(
     "No solver available. \

src/solvers/mod.rs

@@ -41,6 +41,10 @@ pub mod lp_solvers;
 #[cfg_attr(docsrs, doc(cfg(feature = "clarabel")))]
 pub mod clarabel;
 
+#[cfg(feature = "pumpkin-solver")]
+#[cfg_attr(docsrs, doc(cfg(feature = "pumpkin-solver")))]
+pub mod pumpkin_solver;
+
 /// An entity that is able to solve linear problems
 pub trait Solver {
     /// The internal model type used by the solver