From 5c5e931f7cad7994bfc029d729c029c27913d9b9 Mon Sep 17 00:00:00 2001
From: Quentin <jianstm@gmail.com>
Date: Mon, 27 Aug 2018 13:33:10 +0800
Subject: [PATCH] Make Interval conform Comparable

---
 Schedule.xcodeproj/project.pbxproj      | 22 ----------------------
 Sources/Schedule/Interval.swift         | 11 +++++++++++
 Tests/ScheduleTests/DateTimeTests.swift |  4 ++++
 3 files changed, 15 insertions(+), 22 deletions(-)

diff --git a/Schedule.xcodeproj/project.pbxproj b/Schedule.xcodeproj/project.pbxproj
index f3d5690..79aeb0c 100644
--- a/Schedule.xcodeproj/project.pbxproj
+++ b/Schedule.xcodeproj/project.pbxproj
@@ -70,17 +70,10 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
-		626D761B2113F9D100FCAFFE /* README.zh_cn.md */ = {isa = PBXFileReference; lastKnownFileType = net.daringfireball.markdown; path = README.zh_cn.md; sourceTree = "<group>"; };
 		62AA63012133970A00A442A5 /* Calendar.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Calendar.swift; sourceTree = "<group>"; };
 		62AA63032133A0FB00A442A5 /* CalendarTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CalendarTests.swift; sourceTree = "<group>"; };
 		667D2DF62132C5390071DC89 /* DeinitObserver.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeinitObserver.swift; sourceTree = "<group>"; };
 		667D2DF82132C95D0071DC89 /* DeinitObserverTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeinitObserverTests.swift; sourceTree = "<group>"; };
-		668685ED210DCC0E009305C3 /* .swift-version */ = {isa = PBXFileReference; lastKnownFileType = text; path = ".swift-version"; sourceTree = "<group>"; };
-		668685EE210DCC0E009305C3 /* README.md */ = {isa = PBXFileReference; lastKnownFileType = net.daringfireball.markdown; path = README.md; sourceTree = "<group>"; };
-		668685EF210DCC0E009305C3 /* .codecov.yml */ = {isa = PBXFileReference; lastKnownFileType = text; path = .codecov.yml; sourceTree = "<group>"; };
-		668685F0210DCC0E009305C3 /* Schedule.podspec */ = {isa = PBXFileReference; lastKnownFileType = text; path = Schedule.podspec; sourceTree = "<group>"; };
-		668685F1210DCC0F009305C3 /* .travis.yml */ = {isa = PBXFileReference; lastKnownFileType = text; path = .travis.yml; sourceTree = "<group>"; };
-		668685F2210DCC0F009305C3 /* .swiftlint.yml */ = {isa = PBXFileReference; lastKnownFileType = text; path = .swiftlint.yml; sourceTree = "<group>"; };
 		668685F3210DCEB0009305C3 /* Schedule.playground */ = {isa = PBXFileReference; lastKnownFileType = file.playground; path = Schedule.playground; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.swift; };
 		OBJ_10 /* Bucket.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Bucket.swift; sourceTree = "<group>"; };
 		OBJ_11 /* Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Extensions.swift; sourceTree = "<group>"; };
@@ -138,20 +131,6 @@
 			name = Platforms;
 			sourceTree = "<group>";
 		};
-		668685EC210DCBD4009305C3 /* Related */ = {
-			isa = PBXGroup;
-			children = (
-				668685EF210DCC0E009305C3 /* .codecov.yml */,
-				668685ED210DCC0E009305C3 /* .swift-version */,
-				668685F2210DCC0F009305C3 /* .swiftlint.yml */,
-				668685F1210DCC0F009305C3 /* .travis.yml */,
-				668685EE210DCC0E009305C3 /* README.md */,
-				668685F0210DCC0E009305C3 /* Schedule.podspec */,
-				626D761B2113F9D100FCAFFE /* README.zh_cn.md */,
-			);
-			name = Related;
-			sourceTree = "<group>";
-		};
 		668685F4210DD21A009305C3 /* Utils */ = {
 			isa = PBXGroup;
 			children = (
@@ -225,7 +204,6 @@
 				668685F3210DCEB0009305C3 /* Schedule.playground */,
 				OBJ_6 /* Package.swift */,
 				OBJ_37 /* Products */,
-				668685EC210DCBD4009305C3 /* Related */,
 				OBJ_7 /* Sources */,
 				OBJ_24 /* Tests */,
 			);
diff --git a/Sources/Schedule/Interval.swift b/Sources/Schedule/Interval.swift
index d23c81c..53f3838 100644
--- a/Sources/Schedule/Interval.swift
+++ b/Sources/Schedule/Interval.swift
@@ -116,6 +116,17 @@ extension Interval {
     }
 }
 
+extension Interval: Comparable {
+
+    /// Returns a Boolean value indicating whether the first interval is
+    /// less than the second interval.
+    ///
+    /// A negative interval is always less than a positive interval.
+    public static func < (lhs: Interval, rhs: Interval) -> Bool {
+        return lhs.compare(rhs) == .orderedAscending
+    }
+}
+
 // MARK: - Adding & Subtracting
 extension Interval {
     /// Returns a new interval by multipling this interval by the given number.
diff --git a/Tests/ScheduleTests/DateTimeTests.swift b/Tests/ScheduleTests/DateTimeTests.swift
index 7e0864d..2cbbf95 100644
--- a/Tests/ScheduleTests/DateTimeTests.swift
+++ b/Tests/ScheduleTests/DateTimeTests.swift
@@ -21,6 +21,10 @@ final class DateTimeTests: XCTestCase {
         XCTAssertEqual(7.day, 1.week)
 
         XCTAssertEqual((-2).seconds.compare(1.second), .orderedAscending)
+        XCTAssertTrue(1.1.second > 1.0.second)
+        XCTAssertTrue(3.days < 1.week)
+        XCTAssertTrue(4.day >= 4.days)
+        XCTAssertTrue(-2.seconds < 1.seconds)
 
         XCTAssertTrue(1.1.second.isLonger(than: 1.0.second))
         XCTAssertTrue(3.days.isShorter(than: 1.week))