Development Environment Management System (DEMS)

Contents

• 🗒️ Overview
• 🔧 Setup
• 🖍️ Style
• 🏗️ Structure
  • 🟢 Commands
  • 🔵 Config
  • 🟠 Utils

🗒️ Overview

DEMS is a generic CLI tool meant to assist teams to quickly get from onboarding to coding by automating the initialization process of an application (git clone, deps install, provisioning of required services like databases or mail servers) using Docker.

DEMS is made with Bun, TypeScript and Commander.js.

🔧 Setup

To install dependencies:

bun install

To run:

./cli.ts --help

🖍️ Style

Our chosen format and lint tool is Biome. For more information about our preset and custom rules configuration, see the biome.json file.

🏗️ Structure

The current version of DEMS in this repository is a modern adaptation of an internal tool with the same name that I made for gbh.tech. The original version was made purely with Bash scripts, which is the main motivation for this newer version, to extend its capabilities with a rich ecosystem and make it more accesible to developers.

The structure of DEMS is simple: it has commands (/src/commands), and those commands depend on utilities (/src/utils) and config files (/src/config).

🟢 Commands

As you'd expect, commands are the protagonists of DEMS. They assist the software engineer in the various tasks needed to setup a local project and start working on it.

Commands are instances of the Command class provided by Commander.js, which are then added to the main cli Command object in the ./cli.ts file with addCommand().

💡 Execute dems --help to check all available commands.

🔵 Config

The DEMS Config is split into three (3) different contexts found in two different files: ./src/config/cli.ts and ./src/config/dems.ts.

• CLI: modifies the behavior of the CLI tool, without affecting any specific project.
• DEMS: defines the configuration directives of DEMS for every project, in the form of a config.json file.
• Environment: defines the blogal environment variables of DEMS that can affect all other configurations (all env vars start with a prefix DEMS_ to avoid conflicts).

🟠 Utils

The Utils are simply re-usable functions that assist commands, they can go from simple things like normalizing a string, to more complex tags like generating a .env file from the config.json of the project or generating parameter for Docker Compose.

For more information, check the ./src/utils directory.