Add an extra paragraph to the Macro deletion dialog in order to tell people how many items use that macro (closes #81)

module/documents/Macro.mjs

@@ -0,0 +1,39 @@
+export class TAFMacro extends foundry.documents.Macro {
+	async deleteDialog(options, operation) {
+		const itemsUsingMacro = new Set();
+
+		// Check Items on Actors
+		game.actors.forEach(actor => {
+			actor.items.forEach(item => {
+				console.log(item.uuid, `owned by`, actor.uuid);
+				if (item.system.trigger === this.uuid) {
+					itemsUsingMacro.add(item.uuid);
+				};
+			});
+		});
+
+		// Check World Items
+		game.items.forEach(item => {
+			if (item.system.trigger === this.uuid) {
+				itemsUsingMacro.add(item.uuid);
+			};
+		});
+
+		// Modify the dialog arguments
+		const type = _loc(this.constructor.metadata.label);
+		const question = _loc(`COMMON.AreYouSure`);
+		const warning = _loc(`SIDEBAR.DeleteWarning`, { type });
+		let content = `<p style="margin: 0;"><strong>${question}</strong> ${warning}</p>`;
+
+		if (itemsUsingMacro.size) {
+			const extraInfo = _loc(
+				`taf.misc.macro-is-in-use`,
+				{ count: itemsUsingMacro.size },
+			);
+			content += `<p style="margin: 0;">${extraInfo}</p>`;
+		};
+
+		options.content = content;
+		return super.deleteDialog(options, operation);
+	};
+};