devenv.new

A Mix task that wraps any Elixir Mix project generator in a devenv.sh environment.

Installation

Install the archive directly from Hex:

mix archive.install hex devenv_new

Usage

Use mix devenv.new to wrap any Mix project generator:

# Create a Phoenix project with devenv
mix devenv.new phx.new my_app --devenv postgres,redis

# Create an Igniter project with devenv
mix devenv.new igniter.new my_project --devenv elixir=1.17,postgres --install ash,ash_postgres

# Create a basic Elixir project with devenv
mix devenv.new new my_lib --devenv elixir=1.17,minio --sup

# To run Mix in a temporary Elixir Nix environment
nix-shell -p elixir --run 'mix devenv.new igniter.new demo_app '\
'--devenv postgres,bun '\
'--install ash,ash_postgres,ash_authentication_phoenix,ash_graphql '\
'--auth-strategy magic_link '\
'--with phx.new'

cd demo_app
devenv up
MIX_ENV=test mix ash.reset
mix test

See story.html (local) for a full log of a generator run.

Devenv Features

Available devenv features:

• elixir - Elixir runtime (supports version specification, e.g., elixir=1.17)
• postgres - PostgreSQL database with project-specific databases
• redis - Redis cache/session store
• minio - MinIO object storage (S3-compatible)
• npm - Node.js runtime with npm
• bun - Bun runtime/package manager

The generator is built to be easily extendable, by creating an .eex template file and adding it to the look-up table in devenv.new.ex.

Examples

Phoenix with PostgreSQL and Redis

mix devenv.new phx.new my_phoenix_app --devenv postgres,redis
cd my_phoenix_app
devenv shell  # or use direnv

Igniter with Ash and PostgreSQL

mix devenv.new igniter.new my_ash_app --devenv elixir=1.17,postgres --install ash,ash_postgres

Basic Elixir Library with MinIO

mix devenv.new new my_lib --devenv elixir=1.17,minio --sup

How it Works

1. Runs the specified Mix task (e.g., phx.new, igniter.new, new)
2. Initializes devenv in the created project directory
3. Generates devenv.nix with requested features
4. Creates project-specific database configurations when applicable

Developer Instructions

Installing Archive Locally

For development, install the archive from your local checkout:

# Clone and build the archive
git clone https://github.com/your-username/devenv_new.git
cd devenv_new
mix archive.build
mix archive.install devenv_new-*.ez --force

# Test the installation
mix devenv.new --help

Rebuilding After Changes

# Rebuild and reinstall
mix archive.build
mix archive.install devenv_new-*.ez --force

Uninstalling

mix archive.uninstall devenv_new

Requirements

• Elixir/Mix installed
• devenv.sh installed
• The target project generator (e.g., phx.new, igniter.new) available