Omelette.js Simple Autocompletion Helper for Node

Usage no npm install needed!

<script type="module">
  import omeletteFork from '';


Omelette.js v0.3.1

Build Status

npm install omelette

Omelette is a simple, template based autocompletion tool for Node projects.

You just have to decide your program name and CLI fragments.

omelette "githubber <module> <command> <suboption>"

And you are almost done!


A more detailed template spec:

omelette "<programname>[|<shortname>|<short>|<...>] <module> [<command> <suboption> <...>]"


Implementing omelette is very easy.

#!/usr/bin/env coffee

omelette = require "omelette"
comp = omelette "programname|prgmnm|prgnm <firstargument>"

comp.on "firstargument", ->
  @reply ["hello", "cruel", "world"]


You can add multiple names to programs


It's based on a simple CLI template.

Let's think we have a executable file with the name githubber, in a global path.

And in our program, code will be:

#!/usr/bin/env coffee

omelette = require "omelette"

# Write your CLI template.
complete = omelette "githubber|gh <action> <user> <repo>"

# Bind events for every template part.
complete.on "action", -> @reply ["clone", "update", "push"]

complete.on "user", (action)-> @reply fs.readdirSync "/Users/"

complete.on "repo", (user)->
  @reply [

# Initialize the omelette.

# If you want to have a setup feature, you can use `omeletteInstance.setupShellInitFile()` function.
if ~process.argv.indexOf '--setup'

# Rest is yours
console.log "Your program's default workflow."
console.log process.argv

If you like oldschool:

var fs = require("fs"),
    omelette = require("omelette");

// Write your CLI template.
var complete = omelette("githubber|gh <action> <user> <repo>");

complete.on("action", function() {
  this.reply(["clone", "update", "push"]);

complete.on("user", function(action) {

complete.on("repo", function(user) {
    "" + user + "/helloworld",
    "" + user + "/blabla"

// Initialize the omelette.

// If you want to have a setup feature, you can use `omeletteInstance.setupShellInitFile()` function.
if (~process.argv.indexOf '--setup') {

// Rest is yours.
console.log("Your program's default workflow.");

complete.reply is the completion replier. You should pass the options into that method.


Automated Install

Installing, and making your users install the autocompletion feature is very simple.

You can use simply use setupShellInitFile function.

// If you want to write file,

If you use Bash, it will create a file at ~/.<program-name>/ and append a loader code to ~/.bash_profile file.

If you use Zsh, it just append a loader code to ~/.zshrc file.

TL;DR: It does the Manual Install part, basically.

Manual Install

(You should add these instructions to your project's README)

In zsh, you can write these:

echo '. <(./githubber --completion)' >> .zshrc

In bash, you should write:

./githubber --completion >> ~/
echo 'source ~/' >> .bash_profile

That's all!

Now you have an autocompletion system for your CLI tool.


There are some useful additions for omelette.


Callbacks have three parameters:

  • The number of fragment just for global event
  • The parent word.
  • The whole command line buffer allow you to parse and reply as you wish.

Global Event

You also can be able to listen all fragments by "complete" event.

complete.on "complete", (fragment, word, line)-> @reply ["hello", "world"]

Numbered Arguments

You also can listen events by its order.

complete.on "$1", (word, line)-> @reply ["hello", "world"]

Short Names

You can set short name of an executable:

In this example, githubber is long and gh is shorter examples.

omelette "githubber|gh <module> <command> <suboption>"


Now, you can try it in your shell.

git clone
cd omelette/examples
alias githubber="./githubber" # The app should be global, completion will search it on global level.
./githubber --setup --debug # --setup is not provided by omelette, you should proxy it.
# (reload bash, or source ~/.bash_profile)
omelette-debug-githubber # See Debugging section
ghb<tab> # short alias
gh<tab> # short alias


--debug option generates a function called omlette-debug-<programname>. (omlette-debug-githubber in this example).

When you run omlette-debug-<programname>, it will create aliases for your application. (githubber and gh in this example).

Long name,

$ githubber<tab>
clone update push

Or short name:

$ gh<tab>
clone update push

Then you can start easily.

$ ./githubber<tab>
clone update push
$ ./githubber cl<tab>
$ ./githubber clone<tab>
Guest fka
$ ./githubber clone fka<tab>
$ ./githubber clone fka<tab>

Who uses?

Windows Azure uses Omelette to support autocompletion in azure-cli.


I need your contributions to make that work better!


This project licensed under MIT.