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node_modules/@vue/cli-service/lib/commands/help.js

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+const { chalk } = require('@vue/cli-shared-utils')
+const getPadLength = require('../util/getPadLength')
+
+module.exports = (api, options) => {
+  api.registerCommand('help', args => {
+    const commandName = args._[0]
+    if (!commandName) {
+      logMainHelp()
+    } else {
+      logHelpForCommand(commandName, api.service.commands[commandName])
+    }
+  })
+
+  function logMainHelp () {
+    console.log(
+      `\n  Usage: vue-cli-service <command> [options]\n` +
+      `\n  Commands:\n`
+    )
+    const commands = api.service.commands
+    const padLength = getPadLength(commands)
+    for (const name in commands) {
+      if (name !== 'help') {
+        const opts = commands[name].opts || {}
+        console.log(`    ${
+          chalk.blue(name.padEnd(padLength))
+        }${
+          opts.description || ''
+        }`)
+      }
+    }
+    console.log(`\n  run ${
+      chalk.green(`vue-cli-service help [command]`)
+    } for usage of a specific command.\n`)
+  }
+
+  function logHelpForCommand (name, command) {
+    if (!command) {
+      console.log(chalk.red(`\n  command "${name}" does not exist.`))
+    } else {
+      const opts = command.opts || {}
+      if (opts.usage) {
+        console.log(`\n  Usage: ${opts.usage}`)
+      }
+      if (opts.options) {
+        console.log(`\n  Options:\n`)
+        const padLength = getPadLength(opts.options)
+        for (const [flags, description] of Object.entries(opts.options)) {
+          console.log(`    ${
+            chalk.blue(flags.padEnd(padLength))
+          }${
+            description
+          }`)
+        }
+      }
+      if (opts.details) {
+        console.log()
+        console.log(opts.details.split('\n').map(line => `  ${line}`).join('\n'))
+      }
+      console.log()
+    }
+  }
+}