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Dev server with live-reloading, a file server, proxy support, and more. Language and framework agnostic. 🐧

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# Penguin: language and framework agnostic dev server

[<img alt="CI status of main" src="https://img.shields.io/github/actions/workflow/status/LukasKalbertodt/penguin/ci.yml?branch=main&label=CI&logo=github&logoColor=white&style=for-the-badge" height="23">](https://github.com/LukasKalbertodt/penguin/actions/workflows/ci.yml)
[<img alt="App version on crates.io" src="https://img.shields.io/crates/v/penguin-app?label=app%20version&logo=rust&style=for-the-badge" height="23">](https://crates.io/crates/penguin-app)
[<img alt="Library version on crates.io" src="https://img.shields.io/crates/v/penguin?label=library%20version&logo=rust&style=for-the-badge" height="23">](https://crates.io/crates/penguin)
[<img alt="docs.rs" src="https://img.shields.io/crates/v/penguin?color=blue&label=library%20docs&style=for-the-badge" height="23">](https://docs.rs/penguin)

Penguin is a dev server featuring live-reloading, a file server, proxy support, and more.
It is language and framework agnostic, so it works for basically any web project.
Browser sessions can reload themselves (e.g. when a file changes) or show an overlay with a custom message (e.g. the compiler error).

Penguin is available both as a command line application (`penguin-app` on crates.io) and as a library. For for more information on the library, see [its documentation](https://docs.rs/penguin). The rest of this document will mainly talk about the CLI app.

## Example

- `penguin serve .` serves the current directory as file server
- `penguin proxy localhost:3000` forwards all requests to `http://localhost:3000`.
- `-m uri_path:fs_path` allows you to mount additional directories in the router.
- `penguin reload` reloads all active browser sessions.

## Installation

For now, you have to compile the app yourself. It's easiest to install it from
crates.io:

```
cargo install penguin-app
```

Don't worry about the `-app` suffix: the installed binary is called `penguin`.

## CLI Usage

There are two main "entry points": `penguin proxy <target>` and `penguin serve <directory>`.
The `proxy` subcommand is useful if you have some (backend) webserver on your own, e.g. to provide an API.
The `serve` subcommand is useful if you only have static files that need to be served, e.g. for static site generators or backend-less single page applications.

In either case, you can *mount* additional directories at an URL path with `-m/--mount`.
The syntax is `-m <url-path>:<fs-path>`, for example `-m fonts:frontend/static`.
An HTTP request for `/fonts/foo.woff2` would be answered with the file `frontend/static/foo.woff2` or with 404 if said file does not exist.

All paths that are served by Penguin are automatically watched by default.
This means that any file change in any of those directories will lead to all browser sessions reloading automatically.
You can watch additional paths (that are not mounted/served) with `-w/--watch`.

Reloading all active browser sessions can also be done manually via `penguin reload`.
This is intended to be used at the end of your build scripts.
Note that Penguin is not a build system or task executor!
So you are mostly expected to combine it with other tools, like [`watchexec`](https://github.com/watchexec/watchexec), [`cargo watch`](https://github.com/passcod/cargo-watch) or others.
I am also working on [`floof`](https://github.com/LukasKalbertodt/floof/), which is a WIP file-watcher and task-runner/build-system that uses Penguin under the hood to provide a dev server.

Penguins output can be modified with `-v/-vv` and the log level (set via `-l` or `RUST_LOG`).

For the full CLI documentation run `penguin --help` or `penguin <subcommand> --help`.

## Project status and "using in production"

This project is fairly young and not well tested.
However, it already serves as a useful development tool for me.
I'm interested in making it useful for as many people as possible without increasing the project's scope too much.

I am looking for **Community Feedback**: please speak your mind in [this issue](https://github.com/LukasKalbertodt/penguin/issues/6).
Especially if you have a use case that is not yet well served by Penguin, I'd like to know about that!

"Can I use Penguin in production?". **No, absolutely not!** This is a
development tool only and you should not open up a Penguin server to the public.
There are probably a gazillion attack vectors.

## Versioning and stability guarantees

The app and library are versioned independently from one another. The project
mostly follows the usual semantic versioning guidelines.

- The required Rust version (MSRV) can be bumped at any time, even with minor
  releases. This will change once this project reaches 1.0.
- All UI (HTML/CSS) this app/lib produces is subject to change even with minor
  version bumps. For example, you cannot rely on a specific "directory listing"
  of the file server.
- HTTP headers in server replies might be added (or potentially even removed)
  even in minor version bumps.

<br />

---

## License

Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this project by you, as defined in the Apache-2.0 license,
shall be dual licensed as above, without any additional terms or conditions.

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