Makes repairable component able to heal a set amount of damage (#6852)

Content.Server/Repairable/RepairableComponent.cs

@@ -1,3 +1,4 @@
+using Content.Shared.Damage;
 using Content.Shared.Tools;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization.Manager.Attributes;
@@ -9,6 +10,16 @@ namespace Content.Server.Repairable
     [RegisterComponent]
     public sealed class RepairableComponent : Component
     {
+        /// <summary>
+        ///     All the damage to change information is stored in this <see cref="DamageSpecifier"/>.
+        /// </summary>
+        /// <remarks>
+        ///     If this data-field is specified, it will change damage by this amount instead of setting all damage to 0.
+        ///     in order to heal/repair the damage values have to be negative.
+        /// </remarks>
+        [ViewVariables(VVAccess.ReadWrite)] [DataField("damage")]
+        public DamageSpecifier? Damage;
+
         [ViewVariables(VVAccess.ReadWrite)] [DataField("fuelCost")]
         public int FuelCost = 5;
 

Content.Server/Repairable/RepairableSystem.cs

@@ -34,9 +34,18 @@ namespace Content.Server.Repairable
             if (!await _toolSystem.UseTool(args.Used, args.User, uid, component.FuelCost, component.DoAfterDelay, component.QualityNeeded))
                 return;
 
-            // Repair all damage
+            if (component.Damage != null)
-            _damageableSystem.SetAllDamage(damageable, 0);
+            {
-            _logSystem.Add(LogType.Healed, $"{ToPrettyString(args.User):user} repaired ${ToPrettyString(uid):target} back to full health");
+                var damageChanged = _damageableSystem.TryChangeDamage(uid, component.Damage, true, false);
+                _logSystem.Add(LogType.Healed, $"{ToPrettyString(args.User):user} repaired {ToPrettyString(uid):target} by {damageChanged?.Total}");
+            }
+            else
+            {
+                // Repair all damage
+                _damageableSystem.SetAllDamage(damageable, 0);
+                _logSystem.Add(LogType.Healed, $"{ToPrettyString(args.User):user} repaired {ToPrettyString(uid):target} back to full health");
+            }
+
 
             component.Owner.PopupMessage(args.User,
                 Loc.GetString("comp-repairable-repair",