From e148ff60592e519b1a067d2cbfd0161922af1709 Mon Sep 17 00:00:00 2001
From: Jason R Tibbetts <jason@tibbetts.net>
Date: Sat, 31 Jul 2021 11:54:52 -0400
Subject: [PATCH] No ticket: [refactor] Combined Cloisimis's
 TimeInterval.durationString extension with the TimeIntervalExtensions.

---
 Source/Util/TimeIntervalExtensions.swift     | 12 ++++++++++++
 Tests/Util/TimeIntervalExtensionsTests.swift | 20 ++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/Source/Util/TimeIntervalExtensions.swift b/Source/Util/TimeIntervalExtensions.swift
index cb57b6f..0f85787 100644
--- a/Source/Util/TimeIntervalExtensions.swift
+++ b/Source/Util/TimeIntervalExtensions.swift
@@ -12,4 +12,16 @@ public extension TimeInterval {
     var weeks:   TimeInterval { return   7.0 * days    }
     var years:   TimeInterval { return 365.0 * days    }
 
+    var formattedString: String? {
+        return Self.durationFormatter.string(from: self)
+    }
+
+    static var durationFormatter: DateComponentsFormatter = {
+        let formatter = DateComponentsFormatter()
+        formatter.allowedUnits = [.hour, .minute, .second]
+        formatter.collapsesLargestUnit = true
+
+        return formatter
+    }()
+
 }
diff --git a/Tests/Util/TimeIntervalExtensionsTests.swift b/Tests/Util/TimeIntervalExtensionsTests.swift
index c62034c..ace8812 100644
--- a/Tests/Util/TimeIntervalExtensionsTests.swift
+++ b/Tests/Util/TimeIntervalExtensionsTests.swift
@@ -13,4 +13,24 @@ class TimeIntervalExtensionsTests: XCTestCase {
         XCTAssertEqual(2.years, 104.weeks + 2.days)
     }
 
+    // MARK: - durationString
+
+    func testFormattedStringDropsHours() {
+        let timeInterval = 165.0000 // 2:45
+        let durationString = timeInterval.formattedString
+        XCTAssertEqual(durationString, "2:45")
+    }
+
+    func testFormattedStringIncludesHours() {
+        let timeInterval = (3.0 * 60.0 * 60.0) + 165.0000 // 3:02:45
+        let durationString = timeInterval.formattedString
+        XCTAssertEqual(durationString, "3:02:45")
+    }
+
+    func testFormattedStringHandlesNegativeValues() {
+        let timeInterval = -165.0000 // -2:45
+        let durationString = timeInterval.formattedString
+        XCTAssertEqual(durationString, "-2:45")
+    }
+
 }