Nestjs Console
Create beautiful CLI commands in your application. A simple NestJS CLI module, comes packaged with utilities.
Table Of Content
- Features
- Installation
- Getting Started
- Creating Command
- Defining Input
- Command Console I/O
- Available Commands
- Available Options
- Contributing
- About Us
- License
Features
-
Quick Setup - Quickly setup and configure your application
-
Utilities - Comes packed with utilities to let you easily interact and print.
-
Beautiful Commands - Creating a beautiful command is as easy as creating a simple injector.
Installation
To install the package, run
npm install @squareboat/nest-console
OR
yarn add @squareboat/nest-console
For NestJS v6.7.x, please use
npm install @squareboat/nest-console^0.0.7
Getting Started
Once the cli
file is copied, you need to open the cli
file and change the module that you need to pass in createApplicationContext
method.
If you are following the default project structure created by
nest
command. You don't need to do anything.
Once the added the correct module in cli
file, you need to import the ConsoleModule
from the package.
import { Module } from "@nestjs/common";
import { ConsoleModule } from "@squareboat/nest-console";
import { AppController } from "./app.controller";
import { AppService } from "./app.service";
@Module({
imports: [ConsoleModule],
controllers: [AppController],
providers: [AppService],
})
export class AppModule {}
Now, whatever command you create in your application will be discovered automatically.
To be able for the package to discover the command, you need to register the Injectable class inside
providers
property in your module.
Creating Command
There are basically two ways through which you can define commands.
- Using the
Command
decorator on an Injectable class - Using the
Command
decorator on an Injectable class' method.
Remember to use the
@Injectable
decorator on the class always a, else the command will not be discovered and registered.
Class
You can create an injectable class and use @Command
decorator on it. The package will automatically look for handle
method inside the class.
Method
You can use @Command
decorator on the method.
import { Injectable } from "@nestjs/common";
import { Command, ConsoleIO } from "@squareboat/nest-console";
@Injectable()
export class AppService {
@Command("hello {name=world}", { desc: "Test Command" })
sayHello(_cli: ConsoleIO) {
const name = _cli.argument<string>("name");
_cli.info(`Hello ${name}!`);
return;
}
}
Before running the command, you need to build it first.
npm run build
Now, to run any command, you can simply do
node cli hello
Defining Input
We understand that you may want to build commands which can be dynamic in nature, ie. you may expect some required or optional parameters from client while running the command. We have made it dead simple for you to define your input expectations.
All user supplied arguments and options are wrapped in curly braces.
Arguments
Arguments in console applications are required variables.
@Command(
'generate:report {type}',
{ desc: 'Test Command' }
)
$ node cli generate:report gar
Options
Options are the optional inputs for each command. They are denoted by double hyphens (--
).
Example:
@Command(
'generate:report {type} {--emails}',
{ desc: 'Test Command',}
)
$ node cli generate:report gar --emails=email@example.com
To pass array of values in any options or arguments, you can add asterik.
generate:report {type*} {--emails*}
$ node cli generate:report gar gmr --emails=email@example.com --emails=email2@example.com
You can also define default values for the arguments or options by adding a =
equal sign followed by the value.
generate:report {type=gar} {--emails=email@example.com}
Retrieving Inputs
We provide easy to use APIs to work with I/O directly from the console.
Retrieving Passed Inputs
While executing command, you will need to fetch the values that you may have passed in the invocation. Your method will be passed an _cli: ConsoleIO
object. You can then simply check for all the values.
For fetching an argument, you can do
const type = _cli.argument<string>("type");
For fetching an option, you can do
const email = _cli.option<string>("email");
If no value is passed, the argument
and option
function will return the default value or null
value.
Prompting for Input
You may want to ask for input while executing a command. We provide several ways with which you can ask for inputs directly on console.
To ask for simple input from the user, you can call ask(question: string)
method.
const name = _cli.ask("name");
You may want to ask user about some secret or any password, which ideally should not get printed on the console.
const password = await _cli.password("Enter your pasword to continue");
While running a command, you can also give choices to select from a defined list. For example:
/**
* Single choice example.
* Returns one of the passed choices.
*/
const choice = await _cli.select(
"Please select one superhero", // question
["Batman", "Ironman"], // choices
false // multiple?
);
/**
* Multiple choices example.
* Returns an array of the selected options.
*/
const choice = await _cli.select(
"Please select one superhero",
["Batman", "Ironman"],
true
);
Lastly, sometimes you may want to ask for confirmation from the user before doing any execution. You can do so by using confirm
method.
const confirm = await _cli.confirm("Do you really wish to continue?");
if (confirm) {
// do your magic here
}
Writing Outputs
Till now, we have seen how we can operate with differnt type of inputs on the cli. There will be scenarios when you will want to print something on the console. We provide a very easy-to-use set of APIs for your basic console outputing needs.
To print any message on the console, use info
method
_cli.info("Some amazing message"); // Outputs 'Some amazing message' on the console
Incase of an error message, use error
method.
_cli.error("Oops! Something went wrong.");
Similarly, to print any success message, use success
method
_cli.success("Wohoo! The command worked just fine!");
To print a divider on the console, simple do
_cli.line();
To print a table on the console, you can use table
method:
// this will automatically print unicode table on the console
_cli.table([
{ name: "User 1", designation: "Software Engineer L1" },
{ name: "User 2", designation: "Software Engineer L1" },
]);
Available Commands
We provide few commands, which will help in your day to day development process.
To list all commands available in your application, you can do
node cli list
list
is a reserved command name, please don't use it in any of the commands
Available Options
We provide few out-of-the-box predefined options, which you can use with each of your command.
To list all the arguments and options that your command supports/expects, simply run
node cli users:greet --options
--options
is a reserved option. Please don't use it anywhere in your command
Contributing
To know about contributing to this package, read the guidelines here
About Us
We are a bunch of dreamers, designers, and futurists. We are high on collaboration, low on ego, and take our happy hours seriously. We'd love to hear more about your product. Let's talk and turn your great ideas into something even greater! We have something in store for everyone.
We are hiring! Apply now at careers page
License
The MIT License. Please see License File for more information. Copyright © 2020 SquareBoat.
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