From 4245790d63e3a6a3e192471f3d9e31c6967adff4 Mon Sep 17 00:00:00 2001
From: Jack Brewer <jack@jackbrewer.co.uk>
Date: Tue, 4 Apr 2023 15:48:32 +0100
Subject: [PATCH] Add settings info to the message shown as each run starts

---
 src/lib/run-event/helpers.js      | 21 +++++++++++++
 src/lib/run-event/helpers.test.js | 51 +++++++++++++++++++++++++++++++
 src/lib/run-event/index.js        | 14 ++++++---
 3 files changed, 81 insertions(+), 5 deletions(-)
 create mode 100644 src/lib/run-event/helpers.js
 create mode 100644 src/lib/run-event/helpers.test.js

diff --git a/src/lib/run-event/helpers.js b/src/lib/run-event/helpers.js
new file mode 100644
index 00000000..9e24712e
--- /dev/null
+++ b/src/lib/run-event/helpers.js
@@ -0,0 +1,21 @@
+export const formatStartMessage = ({ count, path, formFactor, locale }) => {
+  const message = ['Running Lighthouse on', path];
+
+  // Build a list of settings used for this run.
+  const settings = [];
+  if (locale) {
+    settings.push(`the “${locale}” locale`);
+  }
+  if (formFactor === 'desktop') {
+    settings.push('the “desktop” preset');
+  }
+  if (settings.length) {
+    message.push(`using ${settings.join(' and ')}`);
+  }
+
+  if (count?.total > 1) {
+    message.push(`(${count.i}/${count.total})`);
+  }
+
+  return message.join(' ');
+};
diff --git a/src/lib/run-event/helpers.test.js b/src/lib/run-event/helpers.test.js
new file mode 100644
index 00000000..1c49e28c
--- /dev/null
+++ b/src/lib/run-event/helpers.test.js
@@ -0,0 +1,51 @@
+import { formatStartMessage } from './helpers.js';
+
+describe('formatStartMessage', () => {
+  it('should format a message using only the path', () => {
+    const result = formatStartMessage({ path: 'https://example.com/path' });
+    expect(result).toEqual('Running Lighthouse on https://example.com/path');
+  });
+
+  it('should format a message using only the path and count', () => {
+    const result = formatStartMessage({
+      count: { i: 1, total: 2 },
+      path: 'https://example.com/path',
+    });
+    expect(result).toEqual(
+      'Running Lighthouse on https://example.com/path (1/2)',
+    );
+  });
+
+  it('should format a message using a single feature', () => {
+    const result = formatStartMessage({
+      path: 'https://example.com/path',
+      formFactor: 'desktop',
+    });
+    expect(result).toEqual(
+      'Running Lighthouse on https://example.com/path using the “desktop” preset',
+    );
+  });
+
+  it('should format a message using multiple features', () => {
+    const result = formatStartMessage({
+      path: 'https://example.com/path',
+      formFactor: 'desktop',
+      locale: 'de',
+    });
+    expect(result).toEqual(
+      'Running Lighthouse on https://example.com/path using the “de” locale and the “desktop” preset',
+    );
+  });
+
+  it('should format a message using all available inputs', () => {
+    const result = formatStartMessage({
+      count: { i: 1, total: 2 },
+      path: 'https://example.com/path',
+      formFactor: 'desktop',
+      locale: 'es',
+    });
+    expect(result).toEqual(
+      'Running Lighthouse on https://example.com/path using the “es” locale and the “desktop” preset (1/2)',
+    );
+  });
+});
diff --git a/src/lib/run-event/index.js b/src/lib/run-event/index.js
index 5fb1c461..348f910d 100644
--- a/src/lib/run-event/index.js
+++ b/src/lib/run-event/index.js
@@ -6,6 +6,8 @@ import runAuditWithUrl from '../../lib/run-audit-with-url/index.js';
 import runAuditWithServer from '../../lib/run-audit-with-server/index.js';
 import getConfiguration from '../get-configuration/index.js';
 
+import { formatStartMessage } from './helpers.js';
+
 const runEvent = async ({
   event,
   constants,
@@ -57,12 +59,14 @@ const runEvent = async ({
       const { serveDir, path, url, thresholds, output_path } = auditConfig;
       const fullPath = [serveDir, path].join('/');
 
-      let countMessage = '';
-      if (auditConfigs.length > 1) {
-        countMessage = ` (${i}/${auditConfigs.length})`;
-      }
+      const startMessage = formatStartMessage({
+        count: { i, total: auditConfigs.length },
+        path: fullPath,
+        formFactor: settings?.settings.formFactor,
+        locale: settings?.settings.locale,
+      });
 
-      console.log(`Running Lighthouse on ${fullPath}${countMessage}`);
+      console.log(startMessage);
 
       const runner = isOnSuccess ? runAuditWithUrl : runAuditWithServer;
       const { errors, summary, shortSummary, details, report, runtimeError } =