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module/chat.js

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+import {Actor5e} from "./actor/entity.js";
+
+/**
+ * Highlight critical success or failure on d20 rolls
+ */
+export const highlightCriticalSuccessFailure = function(message, html, data) {
+  if ( !message.isRoll || !message.isRollVisible || !message.roll.parts.length ) return;
+
+  // Highlight rolls where the first part is a d20 roll
+  const roll = message.roll;
+  let d = roll.parts[0];
+  const isD20Roll = d instanceof Die && (d.faces === 20) && (d.results.length === 1);
+  if ( !isD20Roll ) return;
+
+  // Ensure it is not a modified roll
+  const isModifiedRoll = ("success" in d.rolls[0]) || d.options.marginSuccess || d.options.marginFailure;
+  if ( isModifiedRoll ) return;
+
+  // Highlight successes and failures
+  if ( d.options.critical && (d.total >= d.options.critical) ) html.find(".dice-total").addClass("critical");
+  else if ( d.options.fumble && (d.total <= d.options.fumble) ) html.find(".dice-total").addClass("fumble");
+  else if ( d.options.target ) {
+    if ( roll.total >= d.options.target ) html.find(".dice-total").addClass("success");
+    else html.find(".dice-total").addClass("failure");
+  }
+};
+
+/* -------------------------------------------- */
+
+/**
+ * Optionally hide the display of chat card action buttons which cannot be performed by the user
+ */
+export const displayChatActionButtons = function(message, html, data) {
+  const chatCard = html.find(".sw5e.chat-card");
+  if ( chatCard.length > 0 ) {
+
+    // If the user is the message author or the actor owner, proceed
+    let actor = game.actors.get(data.message.speaker.actor);
+    if ( actor && actor.owner ) return;
+    else if ( game.user.isGM || (data.author.id === game.user.id)) return;
+
+    // Otherwise conceal action buttons except for saving throw
+    const buttons = chatCard.find("button[data-action]");
+    buttons.each((i, btn) => {
+      if ( btn.dataset.action === "save" ) return;
+      btn.style.display = "none"
+    });
+  }
+};
+
+/* -------------------------------------------- */
+
+/**
+ * This function is used to hook into the Chat Log context menu to add additional options to each message
+ * These options make it easy to conveniently apply damage to controlled tokens based on the value of a Roll
+ *
+ * @param {HTMLElement} html    The Chat Message being rendered
+ * @param {Array} options       The Array of Context Menu options
+ *
+ * @return {Array}              The extended options Array including new context choices
+ */
+export const addChatMessageContextOptions = function(html, options) {
+  let canApply = li => canvas.tokens.controlledTokens.length && li.find(".dice-roll").length;
+  options.push(
+    {
+      name: game.i18n.localize("SW5E.ChatContextDamage"),
+      icon: '<i class="fas fa-user-minus"></i>',
+      condition: canApply,
+      callback: li => Actor5e.applyDamage(li, 1)
+    },
+    {
+      name: game.i18n.localize("SW5E.ChatContextHealing"),
+      icon: '<i class="fas fa-user-plus"></i>',
+      condition: canApply,
+      callback: li => Actor5e.applyDamage(li, -1)
+    },
+    {
+      name: game.i18n.localize("SW5E.ChatContextDoubleDamage"),
+      icon: '<i class="fas fa-user-injured"></i>',
+      condition: canApply,
+      callback: li => Actor5e.applyDamage(li, 2)
+    },
+    {
+      name: game.i18n.localize("SW5E.ChatContextHalfDamage"),
+      icon: '<i class="fas fa-user-shield"></i>',
+      condition: canApply,
+      callback: li => Actor5e.applyDamage(li, 0.5)
+    }
+  );
+  return options;
+};