Add functionality to create item macros via drag & drop

src/module/macros/item-macro.ts

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+import { DS4Actor } from "../actor/actor";
+import { getCanvas } from "../helpers";
+import { DS4ItemData } from "../item/item-data";
+import notifications from "../ui/notifications";
+
+/**
+ * Create a Macro from an item drop.
+ * Get an existing item macro if one exists, otherwise create a new one.
+ * @param itemData - The item data
+ * @param slot     - The hotbar slot to use
+ */
+export async function createItemMacro(itemData: DS4ItemData, slot: string): Promise<void> {
+    const command = `game.ds4.macros.rollItemMacro("${itemData._id}");`;
+    const macro =
+        game.macros?.entities.find((m) => m.name === itemData.name && m.data.command === command) ??
+        (await Macro.create(
+            {
+                command,
+                name: itemData.name,
+                type: "script",
+                img: itemData.img,
+                flags: { "ds4.itemMacro": true },
+            },
+            { displaySheet: false },
+        ));
+    game.user?.assignHotbarMacro(macro, (slot as unknown) as number); // TODO(types): adjust so that cast is not needed, slot should be an optional string
+}
+
+/**
+ * Execute the item macro for the given itemId.
+ * @param itemId
+ */
+export async function rollItemMacro(itemId: string): Promise<void> {
+    const speaker = ChatMessage.getSpeaker();
+    const actor = (getCanvas().tokens.get(speaker.token ?? "")?.actor ?? game.actors?.get(speaker.actor ?? "")) as
+        | DS4Actor
+        | null
+        | undefined;
+    if (!actor) {
+        return notifications.warn(game.i18n.localize("DS4.WarningMustControlActorToRollItemMacro"));
+    }
+    const item = actor.items?.get(itemId);
+    if (!item) {
+        return notifications.warn(
+            game.i18n.format("DS4.WarningControlledActorDoesNotHaveItem", {
+                actorName: actor.name,
+                actorId: actor.id,
+                itemId,
+            }),
+        );
+    }
+
+    return item.roll();
+}

src/module/macros/macros.ts

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+import { rollItemMacro } from "./item-macro";
+
+export const macros = {
+    rollItemMacro,
+};