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feat: introduces support for default commands, using the '*' identifier (#785)
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‎README.md

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Original file line numberDiff line numberDiff line change
@@ -591,6 +591,34 @@ yargs
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.argv
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```
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### Default Commands
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To specify a default command use the character `*`. A default command
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will be run if the positional arguments provided match no known
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commands:
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```js
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const argv = require('yargs')
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.command('*', 'the default command', () => {}, (argv) => {
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console.log('this command will be run by default')
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})
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```
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The command defined above will be executed if the program
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is run with `./my-cli.js --x=22`.
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Default commands can also be used as a command alias, like so:
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```js
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const argv = require('yargs')
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.command(['serve', '*'], 'the serve command', () => {}, (argv) => {
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console.log('this command will be run by default')
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})
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```
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The command defined above will be executed if the program
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is run with `./my-cli.js --x=22`, or with `./my-cli.js serve --x=22`.
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### Positional Arguments
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Commands can accept _optional_ and _required_ positional arguments. Required

‎lib/command.js

Lines changed: 53 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -2,6 +2,8 @@ const path = require('path')
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const inspect = require('util').inspect
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const camelCase = require('camelcase')
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const DEFAULT_MARKER = '*'
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// handles parsing positional arguments,
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// and populating argv with said positional
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// arguments.
@@ -10,6 +12,7 @@ module.exports = function (yargs, usage, validation) {
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var handlers = {}
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var aliasMap = {}
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var defaultCommand
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self.addHandler = function (cmd, description, builder, handler) {
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var aliases = []
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if (Array.isArray(cmd)) {
@@ -28,15 +31,50 @@ module.exports = function (yargs, usage, validation) {
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return
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}
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// parse positionals out of cmd string
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var parsedCommand = self.parseCommand(cmd)
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// remove positional args from aliases only
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aliases = aliases.map(function (alias) {
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alias = self.parseCommand(alias).cmd // remove positional args
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return self.parseCommand(alias).cmd
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})
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// check for default and filter out '*''
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var isDefault = false
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var parsedAliases = [parsedCommand.cmd].concat(aliases).filter(function (c) {
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if (c === DEFAULT_MARKER) {
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isDefault = true
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return false
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}
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return true
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})
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// short-circuit if default with no aliases
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if (isDefault && parsedAliases.length === 0) {
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defaultCommand = {
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original: cmd.replace(DEFAULT_MARKER, '').trim(),
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handler: handler,
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builder: builder || {},
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demanded: parsedCommand.demanded,
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optional: parsedCommand.optional
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}
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return
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}
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// shift cmd and aliases after filtering out '*'
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if (isDefault) {
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parsedCommand.cmd = parsedAliases[0]
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aliases = parsedAliases.slice(1)
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cmd = cmd.replace(DEFAULT_MARKER, parsedCommand.cmd)
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}
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// populate aliasMap
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aliases.forEach(function (alias) {
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aliasMap[alias] = parsedCommand.cmd
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return alias
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})
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if (description !== false) {
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usage.command(cmd, description, aliases)
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usage.command(cmd, description, isDefault, aliases)
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}
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handlers[parsedCommand.cmd] = {
@@ -46,6 +84,8 @@ module.exports = function (yargs, usage, validation) {
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demanded: parsedCommand.demanded,
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optional: parsedCommand.optional
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}
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if (isDefault) defaultCommand = handlers[parsedCommand.cmd]
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}
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self.addDirectory = function (dir, context, req, callerFile, opts) {
@@ -130,9 +170,13 @@ module.exports = function (yargs, usage, validation) {
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return handlers
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}
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self.hasDefaultCommand = function () {
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return !!defaultCommand
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}
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self.runCommand = function (command, yargs, parsed) {
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var aliases = parsed.aliases
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var commandHandler = handlers[command] || handlers[aliasMap[command]]
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var commandHandler = handlers[command] || handlers[aliasMap[command]] || defaultCommand
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var currentContext = yargs.getContext()
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var numFiles = currentContext.files.length
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var parentCommands = currentContext.commands.slice()
@@ -142,7 +186,7 @@ module.exports = function (yargs, usage, validation) {
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var innerYargs = null
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var positionalMap = {}
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currentContext.commands.push(command)
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if (command) currentContext.commands.push(command)
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if (typeof commandHandler.builder === 'function') {
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// a function can be provided, which builds
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// up a yargs chain and possibly returns it.
@@ -186,7 +230,7 @@ module.exports = function (yargs, usage, validation) {
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commandHandler.handler(innerArgv)
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}
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currentContext.commands.pop()
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if (command) currentContext.commands.pop()
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numFiles = currentContext.files.length - numFiles
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if (numFiles > 0) currentContext.files.splice(numFiles * -1, numFiles)
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@@ -263,6 +307,7 @@ module.exports = function (yargs, usage, validation) {
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self.reset = function () {
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handlers = {}
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aliasMap = {}
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defaultCommand = undefined
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return self
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}
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@@ -275,10 +320,12 @@ module.exports = function (yargs, usage, validation) {
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frozen = {}
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frozen.handlers = handlers
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frozen.aliasMap = aliasMap
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frozen.defaultCommand = defaultCommand
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}
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self.unfreeze = function () {
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handlers = frozen.handlers
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aliasMap = frozen.aliasMap
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defaultCommand = frozen.defaultCommand
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frozen = undefined
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}
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‎lib/usage.js

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Original file line numberDiff line numberDiff line change
@@ -77,8 +77,15 @@ module.exports = function (yargs, y18n) {
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}
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var commands = []
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self.command = function (cmd, description, aliases) {
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commands.push([cmd, description || '', aliases])
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self.command = function (cmd, description, isDefault, aliases) {
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// the last default wins, so cancel out any previously set default
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if (isDefault) {
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commands = commands.map(function (cmdArray) {
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cmdArray[2] = false
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return cmdArray
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})
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}
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commands.push([cmd, description || '', isDefault, aliases])
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}
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self.getCommands = function () {
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return commands
@@ -166,8 +173,13 @@ module.exports = function (yargs, y18n) {
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{text: command[0], padding: [0, 2, 0, 2], width: maxWidth(commands, theWrap) + 4},
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{text: command[1]}
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)
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if (command[2] && command[2].length) {
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ui.div({text: '[' + __('aliases:') + ' ' + command[2].join(', ') + ']', padding: [0, 0, 0, 2], align: 'right'})
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var hints = []
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if (command[2]) hints.push('[' + __('default:').slice(0, -1) + ']') // TODO hacking around i18n here
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if (command[3] && command[3].length) {
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hints.push('[' + __('aliases:') + ' ' + command[3].join(', ') + ']')
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}
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if (hints.length) {
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ui.div({text: hints.join(' '), padding: [0, 0, 0, 2], align: 'right'})
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} else {
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ui.div()
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}

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