chore(cli): add output for waiting logs (#3066)

* Add output for waiting logs

* Update log-displayer & tests

* Update log-displayer

* Update tests

packages/cli/src/lib/run/log-displayer.ts

@@ -1,5 +1,6 @@
 import {APIClient} from '@heroku-cli/command'
 import {ux} from '@oclif/core'
+import color from '@heroku-cli/color'
 import colorize from './colorize'
 import {isFirApp} from '../apps/generation'
 import {LogSession} from '../types/fir'
@@ -74,17 +75,19 @@ async function logDisplayer(heroku: APIClient, options: LogDisplayerOptions) {
     source: options.source,
   }
 
-  if (firApp)
+  if (firApp) {
+    process.stderr.write(color.cyan.bold('Fetching logs...\n\n'))
     Object.assign(requestBodyParameters, {
       dyno: options.dyno,
       type: options.type,
     })
-  else
+  } else {
     Object.assign(requestBodyParameters, {
       dyno: options.dyno || options.type,
       lines: options.lines,
       tail: options.tail,
     })
+  }
 
   let recreateLogSession = false
   do {

packages/cli/test/unit/lib/run/log-displayer.unit.test.ts

@@ -4,7 +4,7 @@ import {Config} from '@oclif/core'
 import {CLIError} from '@oclif/core/lib/errors'
 import {expect} from 'chai'
 import * as nock from 'nock'
-import {stdout} from 'stdout-stderr'
+import {stdout, stderr} from 'stdout-stderr'
 import heredoc from 'tsheredoc'
 import logDisplayer from '../../../../src/lib/run/log-displayer'
 import {cedarApp, firApp} from '../../../fixtures/apps/fixtures'
@@ -380,12 +380,14 @@ describe('logDisplayer', function () {
 
       try {
         stdout.start()
+        stderr.start()
         await logDisplayer(heroku, {
           app: 'my-fir-app',
           tail: false,
         })
       } catch (error: unknown) {
         stdout.stop()
+        stderr.stop()
         const {message} = error as Error
         expect(message.trim()).to.equal('HTTP Error 500 for POST https://api.heroku.com/apps/my-fir-app/log-sessions')
       }
@@ -403,6 +405,9 @@ describe('logDisplayer', function () {
 
       logSession1.done()
       logSession2.done()
+
+      // it displays message about fetching logs for fir apps
+      expect(stderr.output).to.eq('Fetching logs...\n\n')
     })
   })
 })