refactor: warn about long arguments string only once

src/generateTasks.js

@@ -1,8 +1,9 @@
 'use strict'
 
-const path = require('path')
 const micromatch = require('micromatch')
 const pathIsInside = require('path-is-inside')
+const path = require('path')
+
 const { getConfig } = require('./getConfig')
 
 const debug = require('debug')('lint-staged:gen-tasks')

src/resolveTaskFn.js

@@ -26,14 +26,6 @@ function execLinter(bin, args, execaOptions) {
   return execa(bin, args, { ...execaOptions })
 }
 
-/**
- * https://serverfault.com/questions/69430/what-is-the-maximum-length-of-a-command-line-in-mac-os-x
- * https://support.microsoft.com/en-us/help/830473/command-prompt-cmd-exe-command-line-string-limitation
- * https://unix.stackexchange.com/a/120652
- */
-const MAX_ARG_LENGTH =
-  (process.platform === 'darwin' && 262144) || (process.platform === 'win32' && 8191) || 131072
-
 const successMsg = linter => `${symbols.success} ${linter} passed!`
 
 /**
@@ -104,19 +96,6 @@ module.exports = function resolveTaskFn(options) {
   const tasks = linters.map(command => {
     const { bin, args } = findBin(command)
 
-    const argLength = args.join(' ').length
-    if (argLength > MAX_ARG_LENGTH) {
-      console.warn(dedent`${symbols.warning}  ${chalk.yellow(
-        `${chalk.bold(
-          command
-        )} received an argument string of ${argLength} characters, and might not run correctly on your platform.
-It is recommended to use functions as linters and split your command based on the number of staged files. For more info, please read:
-https://github.com/okonet/lint-staged#using-js-functions-to-customize-linter-commands
-        `
-      )}
-        `)
-    }
-
     // If `linter` is a function, args already include `pathsToLint`.
     const argsWithPaths = fnLinter ? args : args.concat(pathsToLint)
 

src/runAll.js

@@ -1,15 +1,27 @@
 'use strict'
 
-const generateTasks = require('./generateTasks')
-const git = require('./gitWorkflow')
-const getStagedFiles = require('./getStagedFiles')
+const chalk = require('chalk')
+const dedent = require('dedent')
 const Listr = require('listr')
 const has = require('lodash/has')
+const symbols = require('log-symbols')
+
+const generateTasks = require('./generateTasks')
+const getStagedFiles = require('./getStagedFiles')
+const git = require('./gitWorkflow')
 const makeCmdTasks = require('./makeCmdTasks')
 const resolveGitDir = require('./resolveGitDir')
 
 const debug = require('debug')('lint-staged:run')
 
+/**
+ * https://serverfault.com/questions/69430/what-is-the-maximum-length-of-a-command-line-in-mac-os-x
+ * https://support.microsoft.com/en-us/help/830473/command-prompt-cmd-exe-command-line-string-limitation
+ * https://unix.stackexchange.com/a/120652
+ */
+const MAX_ARG_LENGTH =
+  (process.platform === 'darwin' && 262144) || (process.platform === 'win32' && 8191) || 131072
+
 /**
  * Executes all tasks and either resolves or rejects the promise
  * @param config {Object}
@@ -39,6 +51,18 @@ module.exports = async function runAll(config) {
 
   debug('Loaded list of staged files in git:\n%O', files)
 
+  const argLength = files.join(' ').length
+  if (argLength > MAX_ARG_LENGTH) {
+    console.warn(
+      dedent`${symbols.warning}  ${chalk.yellow(
+        `lint-staged generated an argument string of ${argLength} characters, and commands might not run correctly on your platform.
+It is recommended to use functions as linters and split your command based on the number of staged files. For more info, please read:
+https://github.com/okonet/lint-staged#using-js-functions-to-customize-linter-commands
+        `
+      )}`
+    )
+  }
+
   const tasks = (await generateTasks(config, gitDir, files)).map(task => ({
     title: `Running tasks for ${task.pattern}`,
     task: async () =>