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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
}
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