feat(cli): format buy & sell output

This attempts to make the cli output for the `buy` and `sell` commands
more human-readable and succint.

Closes #620.

Author: sangaman

lib/cli/utils.ts

@@ -1,6 +1,6 @@
 import { Arguments, Argv } from 'yargs';
 import { callback, loadXudClient } from './command';
-import { PlaceOrderRequest, PlaceOrderEvent, OrderSide } from '../proto/xudrpc_pb';
+import { PlaceOrderRequest, PlaceOrderEvent, OrderSide, PlaceOrderResponse, Order, SwapResult } from '../proto/xudrpc_pb';
 
 export const orderBuilder = (argv: Argv, command: string) => argv
   .option('quantity', {
@@ -50,9 +50,43 @@ export const orderHandler = (argv: Arguments, isSell = false) => {
   if (argv.stream) {
     const subscription = loadXudClient(argv).placeOrder(request);
     subscription.on('data', (response: PlaceOrderEvent) => {
-      console.log(JSON.stringify(response.toObject(), undefined, 2));
+      if (argv.json) {
+        console.log(JSON.stringify(response.toObject(), undefined, 2));
+      } else {
+        console.log('stweeem');
+        const internalMatch = response.getInternalMatch();
+        const swapResult = response.getSwapResult();
+        const remainingOrder = response.getRemainingOrder();
+        if (internalMatch) {
+          formatInternalMatch(internalMatch.toObject());
+        } else if (swapResult) {
+          formatSwapResult(swapResult.toObject());
+        } else if (remainingOrder) {
+          formatRemainingOrder(remainingOrder.toObject());
+        }
+      }
     });
   } else {
-    loadXudClient(argv).placeOrderSync(request, callback(argv));
+    loadXudClient(argv).placeOrderSync(request, callback(argv, formatPlaceOrderOutput));
   }
 };
+
+const formatPlaceOrderOutput = (response: PlaceOrderResponse.AsObject) => {
+  response.internalMatchesList.forEach(formatInternalMatch);
+  response.swapResultsList.forEach(formatSwapResult);
+  if (response.remainingOrder) {
+    formatRemainingOrder(response.remainingOrder);
+  }
+};
+
+const formatInternalMatch = (order: Order.AsObject) => {
+  console.log(`matched ${order.quantity} quantity @ ${order.price} with own order ${order.id}`);
+};
+
+const formatSwapResult = (swapResult: SwapResult.AsObject) => {
+  console.log(`swapped ${swapResult.quantity} with peer order ${swapResult.orderId}`);
+};
+
+const formatRemainingOrder = (remainingOrder: Order.AsObject) => {
+  console.log(`new order ${remainingOrder.id} entered the order book with ${remainingOrder.quantity} quantity`);
+};