cleanup: make rayon optional

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rs-aggregate"
-version = "0.3.1"
+version = "0.3.2"
 authors = ["Keenan Tims <ktims@gotroot.ca>"]
 edition = "2021"
 description = "Aggregate a list of IP prefixes into their minimum equivalent representation"
@@ -10,11 +10,14 @@ license = "MIT"
 categories = ["network-programming"]
 exclude = [".github/*", "doc/*", "test-data/*"]
 
+[features]
+default = ["rayon"]
+
 [dependencies]
 clap = { version = "4.4.6", features = ["derive"] }
 clio = { version = "0.3.4", features = ["clap-parse"] }
 ipnet = "2.8.0"
-rayon = "1.8.0"
+rayon = { version = "1.8.0", optional = true }
 
 [dev-dependencies]
 assert_cmd = "2.0.10"

src/iputils.rs

@@ -1,3 +1,4 @@
+#[cfg(feature = "rayon")]
 use rayon::join;
 use std::{
     error::Error,
@@ -24,12 +25,18 @@ impl IpBothRange {
             IpNet::V6(n) => self.v6.push(n),
         }
     }
+    #[cfg(feature = "rayon")]
     pub fn simplify(&mut self) {
         (self.v4, self.v6) = join(
             || Ipv4Net::aggregate(&self.v4),
             || Ipv6Net::aggregate(&self.v6),
         );
     }
+    #[cfg(not(feature = "rayon"))]
+    pub fn simplify(&mut self) {
+        self.v4 = Ipv4Net::aggregate(&self.v4);
+        self.v6 = Ipv6Net::aggregate(&self.v6);
+    }
 
     pub fn v4_iter(&self) -> impl Iterator<Item = &Ipv4Net> {
         self.v4.iter()