fix: disable ANSI colors in history list when stdout is not a TTY

src/command/history/list.ts

@@ -22,10 +22,14 @@ export class List extends HistoryCommand implements LeafCommand {
 
       return
     }
+
+    const useColors = Boolean(process.stdout.isTTY)
+
     const table = new Table({
       head: ['Index', 'Timestamp', 'Reference', 'Postage stamp batch ID', 'File path', 'Upload type'],
       style: {
-        head: ['green', 'bold'],
+        head: useColors ? ['green', 'bold'] : [],
+        border: useColors ? ['grey'] : [],
       },
       wordWrap: true,
     })

test/command/history.spec.ts

@@ -2,6 +2,9 @@ import chalk from 'chalk'
 import { randomUUID } from 'crypto'
 import { describeCommand, invokeTestCli } from '../utility'
 import { getStampOption } from '../utility/stamp'
+import colors from '@colors/colors/safe'
+
+const ANSI_PATTERN = /\u001B\[\d+m/ //adding this for testing the ansi disable part
 
 async function uploadTestFile() {
   const uploadFilePath = `${__dirname}/../testpage/images/swarm.png`
@@ -124,6 +127,43 @@ describeCommand(
         await invokeTestCli(['history', 'disable', '--yes'])
       })
     })
+
+    describe('ansi: list colors', () => {
+      const originalIsTTY = process.stdout.isTTY
+      const colorsWereEnabled = colors.enabled
+
+      beforeAll(() => {
+        colors.enable()
+      })
+
+      afterAll(() => {
+        if (!colorsWereEnabled) {
+          colors.disable()
+        }
+      })
+
+      afterEach(() => {
+        process.stdout.isTTY = originalIsTTY
+        invokeTestCli(['history', 'disable', '--yes'])
+      })
+
+      it('should not use colors when stdout is not a TTY', async () => {
+        await invokeTestCli(['history', 'enable'])
+        process.stdout.isTTY = false
+        await invokeTestCli(['history', 'list'])
+
+        expect(consoleMessages[1]).not.toMatch(ANSI_PATTERN)
+        expect(consoleMessages[1]).toContain('Timestamp')
+      })
+
+      it('should use colors when stdout is a TTY', async () => {
+        await invokeTestCli(['history', 'enable'])
+        process.stdout.isTTY = true
+        await invokeTestCli(['history', 'list'])
+
+        expect(consoleMessages[1]).toMatch(ANSI_PATTERN)
+      })
+    })
   },
   { configFileName: 'history' },
 )