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R8244/node_modules/yargs/lib/completion.js
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completion.js
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			var fs = require('fs'),
			path = require('path')

			// add bash completions to your
			// yargs-powered applications.
			module.exports = function (yargs, usage) {
			var self = {
			completionKey: 'get-yargs-completions'
			}

			// get a list of completion commands.
			self.getCompletion = function (done) {
			var completions = [],
			current = process.argv[process.argv.length - 1],
			previous = process.argv.slice(process.argv.indexOf('--' + self.completionKey) + 1),
			argv = yargs.parse(previous)

			// a custom completion function can be provided
			// to completion().
			if (completionFunction) {
			if (completionFunction.length < 3) {
			// synchronous completion function.
			return done(completionFunction(current, argv))
			} else {
			// asynchronous completion function
			return completionFunction(current, argv, function (completions) {
			done(completions)
			})
			}
			}

			if (!current.match(/^-/)) {
			usage.getCommands().forEach(function (command) {
			completions.push(command[0])
			})
			}

			if (current.match(/^-/)) {
			Object.keys(yargs.getOptions().key).forEach(function (key) {
			completions.push('--' + key)
			})
			}

			done(completions)
			}

			// generate the completion script to add to your .bashrc.
			self.generateCompletionScript = function ($0) {
			var script = fs.readFileSync(
			path.resolve(__dirname, '../completion.sh.hbs'),
			'utf-8'
			),
			name = path.basename($0)

			// add ./to applications not yet installed as bin.
			if ($0.match(/\.js$/)) $0 = './' + $0

			script = script.replace(/{{app_name}}/g, name)
			return script.replace(/{{app_path}}/g, $0)
			}

			// register a function to perform your own custom
			// completions., this function can be either
			// synchrnous or asynchronous.
			var completionFunction = null
			self.registerFunction = function (fn) {
			completionFunction = fn
			}

			return self
			}