From dbb666870f4ede15b9bf9ded28d844e943e57c0f Mon Sep 17 00:00:00 2001
From: Aurelius Prochazka <aure@aure.com>
Date: Thu, 11 Apr 2024 10:43:49 -0700
Subject: [PATCH] Added 7sus4

---
 Sources/Tonic/ChordType.swift     | 6 ++++++
 Tests/TonicTests/ChordTests.swift | 9 ++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Sources/Tonic/ChordType.swift b/Sources/Tonic/ChordType.swift
index f13de28..a6bfee1 100644
--- a/Sources/Tonic/ChordType.swift
+++ b/Sources/Tonic/ChordType.swift
@@ -41,6 +41,9 @@ public enum ChordType: String, CaseIterable, Codable {
     /// Dominant Seventh: Major Third, Perfect Fifth, Minor Seventh
     case dominantSeventh
 
+    /// Dominant Seventh Suspendend Fourth: Perfect Fourth, Perfect Fifth, Minor Seventh
+    case dominantSeventhSus4
+
     /// Major Seventh: Major Third, Perfect Fifth, Major Seventh
     case majorSeventh
 
@@ -151,6 +154,7 @@ public enum ChordType: String, CaseIterable, Codable {
         case .halfDiminishedSeventh:            return [.m3, .d5, .m7]
         case .diminishedSeventh:                return [.m3, .d5, .d7]
         case .dominantSeventh:                  return [.M3, .P5, .m7]
+        case .dominantSeventhSus4:              return [.P4, .P5, .m7]
         case .majorSeventh:                     return [.M3, .P5, .M7]
         case .minorSeventh:                     return [.m3, .P5, .m7]
         case .minorMajorSeventh:                return [.m3, .P5, .M7]
@@ -203,6 +207,7 @@ extension ChordType: CustomStringConvertible {
         case .halfDiminishedSeventh:            return "ø7"
         case .diminishedSeventh:                return "°7"
         case .dominantSeventh:                  return "7"
+        case .dominantSeventhSus4:              return "7sus4"
         case .majorSeventh:                     return "maj7"
         case .minorSeventh:                     return "m7"
         case .minorMajorSeventh:                return "mMaj7"
@@ -255,6 +260,7 @@ extension ChordType: CustomStringConvertible {
         case .halfDiminishedSeventh:            return "Ø7"
         case .diminishedSeventh:                return "º7"
         case .dominantSeventh:                  return "7"
+        case .dominantSeventhSus4:              return "7sus4"
         case .majorSeventh:                     return "^7"
         case .minorSeventh:                     return "m7"
         case .minorMajorSeventh:                return "m^7"
diff --git a/Tests/TonicTests/ChordTests.swift b/Tests/TonicTests/ChordTests.swift
index 6d05e9d..8935e95 100644
--- a/Tests/TonicTests/ChordTests.swift
+++ b/Tests/TonicTests/ChordTests.swift
@@ -32,7 +32,7 @@ class ChordTests: XCTestCase {
         XCTAssertEqual(cb5.map { $0.description }, ["C♭5"])
     }
 
-    func testC7() {
+    func test7() {
         XCTAssertEqual(Chord(.C, type: .dominantSeventh).description, "C7")
         let notes: [Int8] = [60, 67, 70, 76]
         let pitchSet =  PitchSet(pitches: notes.map { Pitch($0) } )
@@ -40,6 +40,13 @@ class ChordTests: XCTestCase {
         XCTAssertEqual(c7.map { $0.description }, ["C7"])
     }
 
+    func test7sus4() {
+        let notes: [Int8] = [60, 65, 67, 70]
+        let pitchSet =  PitchSet(pitches: notes.map { Pitch($0) } )
+        let c7 = Chord.getRankedChords(from: pitchSet)
+        XCTAssertEqual(c7.map { $0.description }, ["C7sus4"])
+    }
+
     func testAugmentedDiminishededChordsPreferNoInversions() {
         let notes: [Int8] = [60, 64, 68]
         let pitchSet =  PitchSet(pitches: notes.map { Pitch($0) } )