337 lines
11 KiB
JavaScript
337 lines
11 KiB
JavaScript
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.
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module.exports = function (yargs, usage, validation) {
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const self = {}
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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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handler = handler || function () {}
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if (Array.isArray(cmd)) {
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aliases = cmd.slice(1)
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cmd = cmd[0]
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} else if (typeof cmd === 'object') {
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var command = (Array.isArray(cmd.command) || typeof cmd.command === 'string') ? cmd.command : moduleName(cmd)
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if (cmd.aliases) command = [].concat(command).concat(cmd.aliases)
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self.addHandler(command, extractDesc(cmd), cmd.builder, cmd.handler)
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return
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}
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// allow a module to be provided instead of separate builder and handler
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if (typeof builder === 'object' && builder.builder && typeof builder.handler === 'function') {
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self.addHandler([cmd].concat(aliases), description, builder.builder, builder.handler)
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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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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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})
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if (description !== false) {
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usage.command(cmd, description, isDefault, aliases)
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}
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handlers[parsedCommand.cmd] = {
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original: cmd,
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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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if (isDefault) defaultCommand = handlers[parsedCommand.cmd]
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}
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self.addDirectory = function (dir, context, req, callerFile, opts) {
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opts = opts || {}
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// disable recursion to support nested directories of subcommands
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if (typeof opts.recurse !== 'boolean') opts.recurse = false
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// exclude 'json', 'coffee' from require-directory defaults
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if (!Array.isArray(opts.extensions)) opts.extensions = ['js']
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// allow consumer to define their own visitor function
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const parentVisit = typeof opts.visit === 'function' ? opts.visit : function (o) { return o }
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// call addHandler via visitor function
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opts.visit = function (obj, joined, filename) {
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const visited = parentVisit(obj, joined, filename)
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// allow consumer to skip modules with their own visitor
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if (visited) {
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// check for cyclic reference
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// each command file path should only be seen once per execution
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if (~context.files.indexOf(joined)) return visited
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// keep track of visited files in context.files
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context.files.push(joined)
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self.addHandler(visited)
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}
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return visited
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}
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require('require-directory')({ require: req, filename: callerFile }, dir, opts)
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}
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// lookup module object from require()d command and derive name
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// if module was not require()d and no name given, throw error
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function moduleName (obj) {
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const mod = require('which-module')(obj)
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if (!mod) throw new Error('No command name given for module: ' + inspect(obj))
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return commandFromFilename(mod.filename)
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}
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// derive command name from filename
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function commandFromFilename (filename) {
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return path.basename(filename, path.extname(filename))
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}
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function extractDesc (obj) {
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for (var keys = ['describe', 'description', 'desc'], i = 0, l = keys.length, test; i < l; i++) {
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test = obj[keys[i]]
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if (typeof test === 'string' || typeof test === 'boolean') return test
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}
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return false
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}
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self.parseCommand = function (cmd) {
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var extraSpacesStrippedCommand = cmd.replace(/\s{2,}/g, ' ')
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var splitCommand = extraSpacesStrippedCommand.split(/\s+(?![^[]*]|[^<]*>)/)
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var bregex = /\.*[\][<>]/g
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var parsedCommand = {
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cmd: (splitCommand.shift()).replace(bregex, ''),
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demanded: [],
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optional: []
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}
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splitCommand.forEach(function (cmd, i) {
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var variadic = false
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cmd = cmd.replace(/\s/g, '')
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if (/\.+[\]>]/.test(cmd) && i === splitCommand.length - 1) variadic = true
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if (/^\[/.test(cmd)) {
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parsedCommand.optional.push({
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cmd: cmd.replace(bregex, '').split('|'),
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variadic: variadic
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})
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} else {
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parsedCommand.demanded.push({
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cmd: cmd.replace(bregex, '').split('|'),
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variadic: variadic
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})
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}
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})
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return parsedCommand
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}
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self.getCommands = function () {
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return Object.keys(handlers).concat(Object.keys(aliasMap))
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}
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self.getCommandHandlers = function () {
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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, commandIndex) {
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var aliases = parsed.aliases
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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()
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// what does yargs look like after the buidler is run?
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var innerArgv = parsed.argv
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var innerYargs = null
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var positionalMap = {}
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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.
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innerYargs = commandHandler.builder(yargs.reset(parsed.aliases))
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// if the builder function did not yet parse argv with reset yargs
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// and did not explicitly set a usage() string, then apply the
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// original command string as usage() for consistent behavior with
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// options object below.
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if (yargs.parsed === false) {
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if (typeof yargs.getUsageInstance().getUsage() === 'undefined') {
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yargs.usage('$0 ' + (parentCommands.length ? parentCommands.join(' ') + ' ' : '') + commandHandler.original)
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}
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innerArgv = innerYargs ? innerYargs._parseArgs(null, null, true, commandIndex) : yargs._parseArgs(null, null, true, commandIndex)
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} else {
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innerArgv = yargs.parsed.argv
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}
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if (innerYargs && yargs.parsed === false) aliases = innerYargs.parsed.aliases
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else aliases = yargs.parsed.aliases
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} else if (typeof commandHandler.builder === 'object') {
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// as a short hand, an object can instead be provided, specifying
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// the options that a command takes.
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innerYargs = yargs.reset(parsed.aliases)
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innerYargs.usage('$0 ' + (parentCommands.length ? parentCommands.join(' ') + ' ' : '') + commandHandler.original)
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Object.keys(commandHandler.builder).forEach(function (key) {
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innerYargs.option(key, commandHandler.builder[key])
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})
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innerArgv = innerYargs._parseArgs(null, null, true, commandIndex)
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aliases = innerYargs.parsed.aliases
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}
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if (!yargs._hasOutput()) {
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positionalMap = populatePositionals(commandHandler, innerArgv, currentContext, yargs)
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}
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// we apply validation post-hoc, so that custom
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// checks get passed populated positional arguments.
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if (!yargs._hasOutput()) yargs._runValidation(innerArgv, aliases, positionalMap, yargs.parsed.error)
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if (commandHandler.handler && !yargs._hasOutput()) {
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yargs._setHasOutput()
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commandHandler.handler(innerArgv)
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}
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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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return innerArgv
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}
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// transcribe all positional arguments "command <foo> <bar> [apple]"
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// onto argv.
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function populatePositionals (commandHandler, argv, context, yargs) {
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argv._ = argv._.slice(context.commands.length) // nuke the current commands
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var demanded = commandHandler.demanded.slice(0)
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var optional = commandHandler.optional.slice(0)
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var positionalMap = {}
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validation.positionalCount(demanded.length, argv._.length)
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while (demanded.length) {
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var demand = demanded.shift()
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populatePositional(demand, argv, yargs, positionalMap)
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}
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while (optional.length) {
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var maybe = optional.shift()
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populatePositional(maybe, argv, yargs, positionalMap)
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}
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argv._ = context.commands.concat(argv._)
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return positionalMap
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}
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// populate a single positional argument and its
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// aliases onto argv.
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function populatePositional (positional, argv, yargs, positionalMap) {
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// "positional" consists of the positional.cmd, an array representing
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// the positional's name and aliases, and positional.variadic
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// indicating whether or not it is a variadic array.
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var variadics = null
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var value = null
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for (var i = 0, cmd; (cmd = positional.cmd[i]) !== undefined; i++) {
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if (positional.variadic) {
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if (variadics) argv[cmd] = variadics.slice(0)
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else argv[cmd] = variadics = argv._.splice(0)
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} else {
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if (!value && !argv._.length) continue
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if (value) argv[cmd] = value
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else argv[cmd] = value = argv._.shift()
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}
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positionalMap[cmd] = true
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postProcessPositional(yargs, argv, cmd)
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addCamelCaseExpansions(argv, cmd)
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}
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}
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// TODO move positional arg logic to yargs-parser and remove this duplication
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function postProcessPositional (yargs, argv, key) {
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var coerce = yargs.getOptions().coerce[key]
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if (typeof coerce === 'function') {
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try {
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argv[key] = coerce(argv[key])
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} catch (err) {
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yargs.getUsageInstance().fail(err.message, err)
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}
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}
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}
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function addCamelCaseExpansions (argv, option) {
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if (/-/.test(option)) {
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const cc = camelCase(option)
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if (typeof argv[option] === 'object') argv[cc] = argv[option].slice(0)
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else argv[cc] = argv[option]
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}
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}
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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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// used by yargs.parse() to freeze
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// the state of commands such that
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// we can apply .parse() multiple times
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// with the same yargs instance.
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var frozen
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self.freeze = function () {
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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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return self
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}
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