completion.js
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const fs = require('fs')
const path = require('path')
// add bash completions to your
// yargs-powered applications.
module.exports = function (yargs, usage, command) {
const self = {
completionKey: 'get-yargs-completions'
}
// get a list of completion commands.
// 'args' is the array of strings from the line to be completed
self.getCompletion = function (args, done) {
const completions = []
const current = args.length ? args[args.length - 1] : ''
const argv = yargs.parse(args, true)
const aliases = yargs.parsed.aliases
// a custom completion function can be provided
// to completion().
if (completionFunction) {
if (completionFunction.length < 3) {
var result = completionFunction(current, argv)
// promise based completion function.
if (typeof result.then === 'function') {
return result.then(function (list) {
process.nextTick(function () { done(list) })
}).catch(function (err) {
process.nextTick(function () { throw err })
})
}
// synchronous completion function.
return done(result)
} else {
// asynchronous completion function
return completionFunction(current, argv, function (completions) {
done(completions)
})
}
}
var handlers = command.getCommandHandlers()
for (var i = 0, ii = args.length; i < ii; ++i) {
if (handlers[args[i]] && handlers[args[i]].builder) {
const builder = handlers[args[i]].builder
if (typeof builder === 'function') {
const y = yargs.reset()
builder(y)
return y.argv
}
}
}
if (!current.match(/^-/)) {
usage.getCommands().forEach(function (command) {
if (args.indexOf(command[0]) === -1) {
completions.push(command[0])
}
})
}
if (current.match(/^-/)) {
Object.keys(yargs.getOptions().key).forEach(function (key) {
// If the key and its aliases aren't in 'args', add the key to 'completions'
var keyAndAliases = [key].concat(aliases[key] || [])
var notInArgs = keyAndAliases.every(function (val) {
return args.indexOf('--' + val) === -1
})
if (notInArgs) {
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'
)
var 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
}