fix: truncate command title to stdout width

This makes sure the task title is as long as possible to fit on a single line of the console output, applying both to regular and functional tasks.

lib/makeCmdTasks.js

@@ -1,9 +1,27 @@
 'use strict'
 
+const cliTruncate = require('cli-truncate')
+const debug = require('debug')('lint-staged:make-cmd-tasks')
+
 const resolveTaskFn = require('./resolveTaskFn')
 const { createError } = require('./validateConfig')
 
-const debug = require('debug')('lint-staged:make-cmd-tasks')
+const STDOUT_COLUMNS_DEFAULT = 80
+
+const listrPrefixLength = {
+  update: `    X `.length, // indented task title where X is a checkmark or a cross (failure)
+  verbose: `[STARTED] `.length, // verbose renderer uses 7-letter STARTED/SUCCESS prefixes
+}
+
+/**
+ * Get length of title based on the number of available columns prefix length
+ * @param {string} renderer The name of the Listr renderer
+ * @returns {number}
+ */
+const getTitleLength = (renderer, columns = process.stdout.columns) => {
+  const prefixLength = listrPrefixLength[renderer] || 0
+  return (columns || STDOUT_COLUMNS_DEFAULT) - prefixLength
+}
 
 /**
  * Creates and returns an array of listr tasks which map to the given commands.
@@ -12,10 +30,11 @@ const debug = require('debug')('lint-staged:make-cmd-tasks')
  * @param {Array<string|Function>|string|Function} options.commands
  * @param {Array<string>} options.files
  * @param {string} options.gitDir
+ * @param {string} options.renderer
  * @param {Boolean} shell
  * @param {Boolean} verbose
  */
-module.exports = async function makeCmdTasks({ commands, files, gitDir, shell, verbose }) {
+const makeCmdTasks = async ({ commands, files, gitDir, renderer, shell, verbose }) => {
   debug('Creating listr tasks for commands %o', commands)
   const commandArray = Array.isArray(commands) ? commands : [commands]
   const cmdTasks = []
@@ -28,32 +47,26 @@ module.exports = async function makeCmdTasks({ commands, files, gitDir, shell, v
     const resolvedArray = Array.isArray(resolved) ? resolved : [resolved] // Wrap non-array command as array
 
     for (const command of resolvedArray) {
-      let title = isFn ? '[Function]' : command
-
-      if (isFn) {
-        // If the function linter didn't return string | string[]  it won't work
-        // Do the validation here instead of `validateConfig` to skip evaluating the function multiple times
-        if (typeof command !== 'string') {
-          throw new Error(
-            createError(
-              title,
-              'Function task should return a string or an array of strings',
-              resolved
-            )
+      // If the function linter didn't return string | string[]  it won't work
+      // Do the validation here instead of `validateConfig` to skip evaluating the function multiple times
+      if (isFn && typeof command !== 'string') {
+        throw new Error(
+          createError(
+            '[Function]',
+            'Function task should return a string or an array of strings',
+            resolved
           )
-        }
-
-        const [startOfFn] = command.split(' ')
-        title += ` ${startOfFn} ...` // Append function name, like `[Function] eslint ...`
+        )
       }
 
-      cmdTasks.push({
-        title,
-        command,
-        task: resolveTaskFn({ command, files, gitDir, isFn, shell, verbose }),
-      })
+      // Truncate title to single line based on renderer
+      const title = cliTruncate(command, getTitleLength(renderer))
+      const task = resolveTaskFn({ command, files, gitDir, isFn, shell, verbose })
+      cmdTasks.push({ title, command, task })
     }
   }
 
   return cmdTasks
 }
+
+module.exports = makeCmdTasks

lib/runAll.js

@@ -136,6 +136,7 @@ const runAll = async (
         commands: task.commands,
         files: task.fileList,
         gitDir,
+        renderer: listrOptions.renderer,
         shell,
         verbose,
       })

package.json

@@ -33,6 +33,7 @@
   },
   "dependencies": {
     "chalk": "^4.0.0",
+    "cli-truncate": "2.1.0",
     "commander": "^5.1.0",
     "cosmiconfig": "^6.0.0",
     "debug": "^4.1.1",

test/index.spec.js

@@ -8,14 +8,10 @@ jest.unmock('execa')
 import getStagedFiles from '../lib/getStagedFiles'
 // eslint-disable-next-line import/first
 import lintStaged from '../lib/index'
+import { replaceSerializer } from './utils/replaceSerializer'
 
 jest.mock('../lib/getStagedFiles')
 
-const replaceSerializer = (from, to) => ({
-  test: (val) => typeof val === 'string' && from.test(val),
-  print: (val) => val.replace(from, to),
-})
-
 const mockCosmiconfigWith = (result) => {
   cosmiconfig.mockImplementationOnce(() => ({
     search: () => Promise.resolve(result),

test/integration.test.js

@@ -1,5 +1,6 @@
 import makeConsoleMock from 'consolemock'
 import fs from 'fs-extra'
+import ansiSerializer from 'jest-snapshot-serializer-ansi'
 import { nanoid } from 'nanoid'
 import normalize from 'normalize-path'
 import os from 'os'
@@ -10,6 +11,7 @@ jest.unmock('execa')
 
 import execGitBase from '../lib/execGit'
 import lintStaged from '../lib/index'
+import { replaceSerializer } from './utils/replaceSerializer'
 
 jest.setTimeout(20000)
 
@@ -751,8 +753,8 @@ describe('lint-staged', () => {
       LOG [SUCCESS] Preparing...
       LOG [STARTED] Running tasks...
       LOG [STARTED] Running tasks for *.js
-      LOG [STARTED] [Function] git ...
-      LOG [SUCCESS] [Function] git ...
+      LOG [STARTED] git stash drop
+      LOG [SUCCESS] git stash drop
       LOG [SUCCESS] Running tasks for *.js
       LOG [SUCCESS] Running tasks...
       LOG [STARTED] Applying modifications...
@@ -970,6 +972,19 @@ describe('lint-staged', () => {
       })
     ).rejects.toThrowError()
 
+    // Hide filepath from test snapshot because it's not important and varies in CI
+    const replaceFilepathSerializer = replaceSerializer(
+      /prettier --write (.*)?$/gm,
+      `prettier --write FILEPATH`
+    )
+
+    // Awkwardly merge two serializers
+    expect.addSnapshotSerializer({
+      test: (val) => ansiSerializer.test(val) || replaceFilepathSerializer.test(val),
+      print: (val, serialize) =>
+        replaceFilepathSerializer.print(ansiSerializer.print(val, serialize)),
+    })
+
     expect(console.printHistory()).toMatchInlineSnapshot(`
       "
       WARN ‼ Skipping backup because \`--no-stash\` was used.
@@ -980,8 +995,8 @@ describe('lint-staged', () => {
       LOG [SUCCESS] Hiding unstaged changes to partially staged files...
       LOG [STARTED] Running tasks...
       LOG [STARTED] Running tasks for *.js
-      LOG [STARTED] [Function] prettier ...
-      LOG [SUCCESS] [Function] prettier ...
+      LOG [STARTED] prettier --write FILEPATH
+      LOG [SUCCESS] prettier --write FILEPATH
       LOG [SUCCESS] Running tasks for *.js
       LOG [SUCCESS] Running tasks...
       LOG [STARTED] Applying modifications...

test/makeCmdTasks.spec.js

@@ -61,7 +61,7 @@ describe('makeCmdTasks', () => {
   it('should work with function task returning a string', async () => {
     const res = await makeCmdTasks({ commands: () => 'test', gitDir, files: ['test.js'] })
     expect(res.length).toBe(1)
-    expect(res[0].title).toEqual('[Function] test ...')
+    expect(res[0].title).toEqual('test')
   })
 
   it('should work with function task returning array of string', async () => {
@@ -71,8 +71,8 @@ describe('makeCmdTasks', () => {
       files: ['test.js'],
     })
     expect(res.length).toBe(2)
-    expect(res[0].title).toEqual('[Function] test ...')
-    expect(res[1].title).toEqual('[Function] test2 ...')
+    expect(res[0].title).toEqual('test')
+    expect(res[1].title).toEqual('test2')
   })
 
   it('should work with function task accepting arguments', async () => {
@@ -82,8 +82,8 @@ describe('makeCmdTasks', () => {
       files: ['test.js', 'test2.js'],
     })
     expect(res.length).toBe(2)
-    expect(res[0].title).toEqual('[Function] test ...')
-    expect(res[1].title).toEqual('[Function] test ...')
+    expect(res[0].title).toEqual('test test.js')
+    expect(res[1].title).toEqual('test test2.js')
   })
 
   it('should work with array of mixed string and function tasks', async () => {
@@ -93,17 +93,17 @@ describe('makeCmdTasks', () => {
       files: ['test.js', 'test2.js', 'test3.js'],
     })
     expect(res.length).toBe(5)
-    expect(res[0].title).toEqual('[Function] test ...')
+    expect(res[0].title).toEqual('test')
     expect(res[1].title).toEqual('test2')
-    expect(res[2].title).toEqual('[Function] test ...')
-    expect(res[3].title).toEqual('[Function] test ...')
-    expect(res[4].title).toEqual('[Function] test ...')
+    expect(res[2].title).toEqual('test test.js')
+    expect(res[3].title).toEqual('test test2.js')
+    expect(res[4].title).toEqual('test test3.js')
   })
 
   it('should work with async function tasks', async () => {
     const res = await makeCmdTasks({ commands: async () => 'test', gitDir, files: ['test.js'] })
     expect(res.length).toBe(1)
-    expect(res[0].title).toEqual('[Function] test ...')
+    expect(res[0].title).toEqual('test')
   })
 
   it("should throw when function task doesn't return string | string[]", async () => {
@@ -120,4 +120,17 @@ describe('makeCmdTasks', () => {
 Please refer to https://github.com/okonet/lint-staged#configuration for more information..."
 `)
   })
+
+  it('should truncate task title', async () => {
+    const longString = new Array(1000)
+      .fill()
+      .map((_, index) => index)
+      .join('')
+
+    const res = await makeCmdTasks({ commands: () => longString, gitDir, files: ['test.js'] })
+    expect(res.length).toBe(1)
+    expect(res[0].title).toMatchInlineSnapshot(
+      `"0123456789101112131415161718192021222324252627282930313233343536373839404142434…"`
+    )
+  })
 })

test/utils/replaceSerializer.js

@@ -0,0 +1,4 @@
+export const replaceSerializer = (from, to) => ({
+  test: (val) => typeof val === 'string' && from.test(val),
+  print: (val) => val.replace(from, to),
+})

yarn.lock

@@ -1845,7 +1845,7 @@ cli-cursor@^3.1.0:
   dependencies:
     restore-cursor "^3.1.0"
 
-cli-truncate@^2.1.0:
+cli-truncate@2.1.0, cli-truncate@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/cli-truncate/-/cli-truncate-2.1.0.tgz#c39e28bf05edcde5be3b98992a22deed5a2b93c7"
   integrity sha512-n8fOixwDD6b/ObinzTrp1ZKFzbgvKZvuz/TvejnLn1aQfC6r52XEx85FmuC+3HI+JM7coBRXUvNqEU2PHVrHpg==