`now alias ls`: accept deployment url

lib/alias.js

@@ -6,9 +6,10 @@ import chalk from 'chalk';
 
 export default class Alias extends Now {
 
-  async ls (target) {
-    if (target) {
-      const res = await this._fetch(`/now/deployments/${target}/aliases`);
+  async ls (deployment) {
+    if (deployment) {
+      const target = await this.findDeployment(deployment);
+      const res = await this._fetch(`/now/deployments/${target.uid}/aliases`);
       const body = await res.json();
       return body.aliases;
     }
@@ -33,10 +34,9 @@ export default class Alias extends Now {
     console.log(`${chalk.cyan('> Success!')}`);
   }
 
-  async set (deployment, alias) {
+  async findDeployment (deployment) {
     const list = await this.list();
     let key, val;
-
     if (/\./.test(deployment)) {
       val = toHost(deployment);
       key = 'url';
@@ -60,6 +60,11 @@ export default class Alias extends Now {
       return false;
     });
 
+    return depl;
+  }
+
+  async set (deployment, alias) {
+    const depl = await this.findDeployment(deployment);
     if (!depl) {
       const err = new Error(`Deployment not found by "${deployment}". Run ${chalk.dim('`now ls`')} to see your deployments.`);
       err.userError = true;