[#1610] Apply temp HP from context menu on dice rolls (#1614)

Co-authored-by: Jeff Hitchcock <[email protected]>

lang/en.json

@@ -222,6 +222,7 @@
 "DND5E.Charges": "Charges",
 "DND5E.ChatContextDamage": "Apply Damage",
 "DND5E.ChatContextHealing": "Apply Healing",
+"DND5E.ChatContextTempHP": "Apply Temporary HP",
 "DND5E.ChatContextDoubleDamage": "Apply Double Damage",
 "DND5E.ChatContextHalfDamage": "Apply Half Damage",
 "DND5E.ChatFlavor": "Chat Message Flavor",

module/documents/actor/actor.mjs

@@ -776,6 +776,22 @@ export default class Actor5e extends Actor {
     return allowed !== false ? this.update(updates, {dhp: -amount}) : this;
   }
 
+  /* -------------------------------------------- */
+
+  /**
+   * Apply a certain amount of temporary hit point, but only if it's more than the actor currently has.
+   * @param {number} amount       An amount of temporary hit points to set
+   * @returns {Promise<Actor5e>}  A Promise which resolves once the temp HP has been applied
+   */
+  async applyTempHP(amount=0) {
+    amount = parseInt(amount);
+    const hp = this.system.attributes.hp;
+
+    // Update the actor if the new amount is greater than the current
+    const tmp = parseInt(hp.temp) || 0;
+    return amount > tmp ? this.update({"system.attributes.hp.temp": amount}) : this;
+  }
+
   /* -------------------------------------------- */
 
   /**

module/documents/chat-message.mjs

@@ -85,6 +85,12 @@ export function addChatMessageContextOptions(html, options) {
       condition: canApply,
       callback: li => applyChatCardDamage(li, -1)
     },
+    {
+      name: game.i18n.localize("DND5E.ChatContextTempHP"),
+      icon: '<i class="fas fa-user-clock"></i>',
+      condition: canApply,
+      callback: li => applyChatCardTemp(li)
+    },
     {
       name: game.i18n.localize("DND5E.ChatContextDoubleDamage"),
       icon: '<i class="fas fa-user-injured"></i>',
@@ -120,6 +126,22 @@ function applyChatCardDamage(li, multiplier) {
   }));
 }
 
+/* -------------------------------------------- */
+
+/**
+ * Apply rolled dice as temporary hit points to the controlled token(s).
+ * @param {HTMLElement} li  The chat entry which contains the roll data
+ * @returns {Promise}
+ */
+function applyChatCardTemp(li) {
+  const message = game.messages.get(li.data("messageId"));
+  const roll = message.rolls[0];
+  return Promise.all(canvas.tokens.controlled.map(t => {
+    const a = t.actor;
+    return a.applyTempHP(roll.total);
+  }));
+}
+
 /* -------------------------------------------- */
 
 /**