Add a <=> method to compare CSUUIDs.

Author: wyhaines

shard.yml

@@ -1,5 +1,5 @@
 name: csuuid
-version: 0.2.3
+version: 0.2.4
 
 authors:
   - Kirk Haines <[email protected]>

spec/csuuid_spec.cr

@@ -91,4 +91,12 @@ describe CSUUID do
     uuids = CSUUID.generate(10000)
     uuids.uniq.size.should eq uuids.size
   end
+
+  it "can compare CSUUIDs via <=>" do
+    uuid1 = CSUUID.new
+    uuid2 = CSUUID.new
+    (uuid1 <=> uuid2).should eq -1
+    (uuid2 <=> uuid1).should eq 1
+    (uuid1 <=> uuid1).should eq 0
+  end
 end

src/csuuid.cr

@@ -40,7 +40,7 @@ require "crystal/spin_lock"
 # ```
 #
 struct CSUUID
-  VERSION = "0.2.3"
+  VERSION = "0.2.4"
 
   @@mutex = Crystal::SpinLock.new
   # @@mutex = Mutex.new(protection: Mutex::Protection::Reentrant)
@@ -168,4 +168,16 @@ struct CSUUID
     hs = @bytes.hexstring
     io << "#{hs[0..7]}-#{hs[8..11]}-#{hs[12..15]}-#{hs[16..19]}-#{hs[20..31]}"
   end
+
+  def <=>(val)
+    s, ns = seconds_and_nanoseconds
+    s_val, ns_val = val.seconds_and_nanoseconds
+    r = s <=> s_val
+    return r unless r == 0
+
+    r = ns <=> ns_val
+    return r unless r == 0
+
+    to_s <=> val.to_s
+  end
 end