Add No Long Notes mod

osu.Game.Rulesets.Mania/ManiaRuleset.cs

@@ -243,7 +243,8 @@ namespace osu.Game.Rulesets.Mania
                         new ManiaModDifficultyAdjust(),
                         new ManiaModClassic(),
                         new ManiaModInvert(),
-                        new ManiaModConstantSpeed()
+                        new ManiaModConstantSpeed(),
+                        new ManiaModNoLongNotes()
                     };
 
                 case ModType.Automation:

osu.Game.Rulesets.Mania/Mods/ManiaModNoLongNotes.cs

@@ -0,0 +1,80 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using osu.Framework.Extensions.IEnumerableExtensions;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Mania.Objects;
+using osu.Game.Rulesets.Mods;
+using osu.Framework.Graphics.Sprites;
+using System;
+using System.Collections.Generic;
+using osu.Game.Audio;
+using osu.Game.Rulesets.Mania.Beatmaps;
+using osu.Framework.Utils;
+using osu.Game.Overlays.Settings;
+using osu.Framework.Bindables;
+using osu.Game.Configuration;
+using osu.Game.Graphics;
+
+
+
+namespace osu.Game.Rulesets.Mania.Mods
+{
+    public class ManiaModNoLongNotes : Mod, IApplicableAfterBeatmapConversion
+    {
+
+        public override string Name => "No Long Notes";
+        public override string Acronym => "NL";
+        public override double ScoreMultiplier => 1;
+        public override string Description => @"Turns all held notes into tap notes. No coordination required.";
+        public override IconUsage? Icon => FontAwesome.Solid.DotCircle;
+        public override ModType Type => ModType.Conversion;
+
+        [SettingSource("Add end notes", "Also add a note at the end of a held note")]
+        public BindableBool AddEndNotes { get; } = new BindableBool
+        {
+            Default = true,
+            Value = true
+        };
+
+        [SettingSource("Length threshold", "Only add an end note for held notes longer than this threshold (in milliseconds)")]
+        public BindableNumber<double> Threshold { get; } = new BindableDouble
+        {
+            MinValue = 1.0,
+            MaxValue = 1990.0,
+            Default = 200.0,
+            Value = 200.0,
+            Precision = 1.0,
+        };
+        public void ApplyToBeatmap(IBeatmap beatmap)
+        {
+            var maniaBeatmap = (ManiaBeatmap)beatmap;
+
+            var newObjects = new List<ManiaHitObject>();
+            beatmap.HitObjects.OfType<HoldNote>().ForEach(h => 
+            {
+                // Add a note for the beginning of the hold note
+                newObjects.Add(new Note
+                {
+                    Column = h.Column,
+                    StartTime = h.StartTime,
+                    Samples = h.Samples
+                });
+
+                // Don't add an end note if the duration is below the threshold, or end notes are disabled
+                if (AddEndNotes.Value && h.Duration > Threshold.Value) 
+                {
+                    newObjects.Add(new Note
+                    {
+                        Column = h.Column,
+                        StartTime = h.EndTime,
+                        Samples = h.Samples
+                    });
+                }
+            });
+
+            maniaBeatmap.HitObjects = maniaBeatmap.HitObjects.OfType<Note>().Concat(newObjects).OrderBy(h => h.StartTime).ToList();            
+        }
+    }
+}