Add support for rolling death saving throws

lang/en.json

@@ -282,7 +282,7 @@
   "DND5E.DamImm": "Damage Immunities",
   "DND5E.DamRes": "Damage Resistances",
   "DND5E.DamVuln": "Damage Vulnerabilities",
-  "DND5E.DeathSave": "Death Saving Throws",
+  "DND5E.DeathSave": "Death Saves",
   "DND5E.Description": "Description",
   "DND5E.Details": "Details",
   "DND5E.Equipped": "Equipped",

module/actor/entity.js

@@ -392,6 +392,56 @@ export class Actor5e extends Actor {
 
   /* -------------------------------------------- */
 
+  /**
+   * Perform a death saving throw, rolling a d20 plus any global save bonuses
+   * @param {Object} options      Additional options which modify the roll
+   * @return {Promise<Roll>}      A Promise which resolves to the Roll instance
+   */
+  async rollDeathSave(options={}) {
+    const bonus = getProperty(this.data.data.bonuses, "abilities.save");
+    const parts = !!bonus ? ["@saveBonus"] : [];
+    const speaker = ChatMessage.getSpeaker({actor: this});
+    const roll = await Dice5e.d20Roll({
+      event: options.event,
+      parts: parts,
+      data: {saveBonus: parseInt(bonus)},
+      title: `Death Saving Throw`,
+      speaker: speaker
+    });
+
+    // Take action depending on the result
+    const success = roll.total >= 10;
+    const death = this.data.data.attributes.death;
+
+    // Save success
+    if ( success ) {
+      let successes = (death.success || 0) + (roll.total === 20 ? 2 : 1);
+      if ( successes === 3 ) {      // Survival
+        await this.update({
+          "data.attributes.death.success": 0,
+          "data.attributes.death.failure": 0,
+          "data.attributes.hp.value": 1
+        });
+        await ChatMessage.create({content: `${this.name} has survived with 3 death save successes!`, speaker});
+      }
+      else await this.update({"data.attributes.death.success": Math.clamped(successes, 0, 3)});
+    } 
+
+    // Save failure
+    else {
+      let failures = (death.failure || 0) + (roll.total === 1 ? 2 : 1);
+      await this.update({"data.attributes.death.failure": Math.clamped(failures, 0, 3)});
+      if ( failures === 3 ) {       // Death
+        await ChatMessage.create({content: `${this.name} has died with 3 death save failures!`, speaker});
+      }
+    }
+
+    // Return the rolled result
+    return roll;
+  }
+
+  /* -------------------------------------------- */
+
   /**
    * Roll a hit die of the appropriate type, gaining hit points equal to the die roll plus your CON modifier
    * @param {string} formula    The hit die type to roll. Example "d8"

module/actor/sheets/character.js

@@ -230,6 +230,21 @@ export class ActorSheet5eCharacter extends ActorSheet5e {
     // Short and Long Rest
     html.find('.short-rest').click(this._onShortRest.bind(this));
     html.find('.long-rest').click(this._onLongRest.bind(this));
+
+    // Death saving throws
+    html.find('.death-save').click(this._onDeathSave.bind(this));
+  }
+
+  /* -------------------------------------------- */
+
+  /**
+   * Handle rolling a death saving throw for the Character
+   * @param {MouseEvent} event    The originating click event
+   * @private
+   */
+  _onDeathSave(event) {
+    event.preventDefault();
+    return this.actor.rollDeathSave({event: event});
   }
 
   /* -------------------------------------------- */

templates/actors/character-sheet.html

@@ -183,7 +183,7 @@ <h4 class="attribute-name box-title">{{ localize "DND5E.Initiative" }}</h4>
                 {{!-- Counters --}}
                 <div class="counters flexrow">
                     <div class="counter flexrow death-saves">
-                        <h4>{{ localize "DND5E.DeathSave" }}</h4>
+                        <h4 class="death-save rollable">{{ localize "DND5E.DeathSave" }}</h4>
                         <div class="counter-value">
                             <i class="fas fa-check"></i>
                             <input type="text" name="data.attributes.death.success" data-dtype="Number" placeholder="0"