CLI lite parser for Deno

CliteParser generate CLI from a class, each method generate a “command”, each field generate an “option” :

#!/usr/bin/env -S deno run -A
import { cliteRun } from "https://deno.land/x/clite_parser@0.1.10/clite_parser.ts";

class Tool {
  retry = 2;
  webUrl = "none"; // fields are converted to kebab case as global options
  no_color?: string | boolean; // → --no-color

  main() {
    console.log("main command", this);
  }

  up() {
    console.log("up command", this);
  }

  down(force: boolean, timeout: number) {
    console.log("down command", { force, timeout }, this);
  }
}

cliteRun(new Tool());

The help is generated automatically:

Plain text (without color and styles in markdown):

$ ./example-lite-lite.ts --help
Usage: <Tool file> [Options] [command [command args]]

Commands:
  main                    (default)
  up
  down <force> <timeout>

Options:
  --retry=<RETRY>        (default "2")
  --web-url=<WEB_URL>    (default "none")
  --no-color=<NO_COLOR>
  --help                 Show this help

Run the commands with options and arguments

#                   ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓ options ↓↓↓↓↓↓↓↓↓↓↓ ↓command↓ ↓cmd args↓
$ ./example-lite.ts --retry=4 --web-url=tttt --no-color   down     true  14
down command { force: "true", timeout: "14" } Tool { retry: "4", webUrl: "tttt", no_color: true }

$ ./example-lite.ts down true 14
down command { force: "true", timeout: "14" } Tool { retry: 2, webUrl: "none", no_color: undefined }

$ ./example-lite.ts  --retry=4 --web-url=tttt --no-color
main command Tool { retry: "4", webUrl: "tttt", no_color: true }

Help description

Optional fields _<filed or method name>_desc are displayed as description in the help :

#!/usr/bin/env -S deno run -A
import { cliteRun } from "https://deno.land/x/clite_parser@0.1.10/clite_parser.ts";

class Tool {
  _desc = "This tool is a little example of CliteParser"; // optional description
  retry = 2;
  webUrl = "none"; // fields are converted to kebab case as global options
  no_color?: string | boolean; // → --no-color
  _no_color_desc = "skip colorize"; // optional description for "no_color" field
  _up_desc = "create and start"; // optional description for "up" command

  main() {
    console.log("main command", this);
  }

  up() {
    console.log("up command", this);
  }

  down(force: boolean, timeout: number) {
    console.log("down command", { force, timeout }, this);
  }
}

if (import.meta.main) { // if the file is imported, do not execute this block
  cliteRun(new Tool());
}

Plain text (without color and styles in markdown):

This tool is a little example of CliteParser

Usage: <Tool file> [Options] [command [command args]]

Commands:
  main                    (default)
  up                      create and start
  down <force> <timeout>

Options:
  --retry=<RETRY>        (default "2")
  --web-url=<WEB_URL>    (default "none")
  --no-color=<NO_COLOR>  skip colorize
  --help                 Show this help

Default command

• If there is only one method/command => this method is the default
• If the main method exist => main is the default
• else => no default method

$ ./example-lite.ts
main command Tool { retry: 2, webUrl: "none", no_color: undefined }

Ignore _* methods and fields (in the help)

Fields and methods that start with “_” are ignored.

_privateData = 12;
_privmethod();
{
  console.log("this method is not visible in the help (starts with '_')");
}

Note: this “private” method can be run by the CLI, it’s useful during the development.

Boolean options

$ ./example-lite.ts
main command Tool { retry: 2, webUrl: "none", no_color: undefined }
$ ./example-lite.ts --no-color
main command Tool { retry: 2, webUrl: "none", no_color: true }
$ ./example-lite.ts --no-color=false
main command Tool { retry: 2, webUrl: "none", no_color: "false" }
$ ./example-lite.ts --no-color=true
main command Tool { retry: 2, webUrl: "none", no_color: "true" }

Return value

If the method run by cliteRun return a value != undefined, it will be print in stdout.

This behavior can be disabled with the env var CLITE_RUN_DONT_PRINT_RESULT:

export CLITE_RUN_DONT_PRINT_RESULT=false

or with the config : cliteRun(new Tool(), { dontPrintResult: true } )

cliteRun config

cliteRun(new Tool(), { args: ... } )

type CliteRunConfig = {
  args?: string[]; // default : Deno.args
  dontPrintResult?: boolean; // default : false
};