Termion
chat
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Termion
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When to flush()?
This is an example from the Termion crate:
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How difficult is ncurses?
There are plenty of terminal UI libraries that are actually nice to work with. For Python, there's Textual and PyTermGUI. For Rust, there's ratatui and Cursive (or, if you want something a bit lower level, crosster or termion). For Go, there's bubbletea.
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Writing to a real stdout in the following adapter pattern
But let's say I want to write to Termion's raw terminal: stdout().into_raw_mode().unwrap();
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How to write the mock version of this trait method?
And I implemented it for a TermWriter struct (Note: DetectCursorPos comes from the Termion crate):
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How to test the cursor's position in the following test?
The following code stores the user input and cursor position in a raw terminal (using Termion):
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Testing the stdout of a RawTerminal
That being said, termion has already handle this for us (an example).
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Termion: recreating Backspace for deleting characters
I'm trying to recreate the Backspace functionality with Termion in raw mode. Right now, it works as expected if I'm deleting the last character. But If I move to the left with the Left arrow, then delete a character, the characters on the right of the cursor won't move to the left.
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When rustc developers run out of error messages to write
Termion crate (https://crates.io/crates/termion), and very careful observation of a rust error. Hope your friend finds it useful ;)
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Crate for an interactive terminal program.
Found an alternative https://github.com/redox-os/termion
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Hey Rustaceans! Got an easy question? Ask here (35/2021)!
If you just need basic printing and limited input then I'd choose either crossterm or termion. If you want a full tui, then tui-rs is really good.
chat
- Lunatic is an Erlang-inspired runtime for WebAssembly
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Charm – tools to make the command line glamorous
TUIs over ssh/telnet can be a lot of fun. Especially in cases where multiple people can interact with each other on the server. It simplifies the programming model as you only have one state on the backend that you render to multiple connections. Syncing up everyone becomes trivial. You can also use some React concepts, like rendering a virtual TUI and sending just the right set of minimal escape sequences back to the user to bring their display up to date.
A few months ago I implemented a telnet chat server[0] for fun and it was surprisingly easy to do so. Even by using a wasm vm that I was still working on at the same time.
[0]: https://github.com/lunatic-solutions/chat
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Launch HN: Lunatic (YC W21) – An Erlang Inspired WebAssembly Platform
We are investing a lot of effort into making Lunatic feel native to the particular language and ecosystem. If you look at the Rust chat server we built in Lunatic (https://github.com/lunatic-solutions/chat), it fully integrates with cargo. You just run your typical “cargo run” command, it will compile the app to wasm and use lunatic to run it. If you want to run your test, you can just do “cargo test”.
wasm-bindgen is necessary only because it’s really hard right now to merge the wasm world and the JS one in the browser. We have the advantage here of staying out of the browser.
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How I built a telnet chat server in 2021 with WebAssembly
It took me around a week to build it with Rust + Lunatic and you can check out the code here. If you would like to try it out you can connect to it with:
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The Stakker actor runtime: Beyond "Go++"
Recently I implemented a command line chat server in Rust using an actor framework. I model each TCP connection as an actor.
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I built a telnet chat server with WebAssembly
Hi HN,
I'm working on an Erlang inspired WebAssembly runtime for the backend[0]. Recently I added TCP support and was looking for apps I could build with it. I ended up building a telnet line chat app. It was a great dogfooding experience and has a nice retro feel to it.
You can access the US server with:
> telnet lunatic.chat
or the EU one with:
> telnet eu.lunatic.chat
Pick the one closer to you, as all the rendering is done on the backend and lower latency will mean better UX.
The server is open source[1] and written in Rust. The Rust code is then compiled to WebAssembly and runs on top of Lunatic. Each connection runs in a separate (lightweight) process, has it's own state and sends just a diff of esc-sequences back to the terminal to bring it up to date with the current render buffer. Everything is deployed to an ARM Linux box.
[0]: https://github.com/lunatic-solutions/lunatic
[1]: https://github.com/lunatic-solutions/chat
- WebAssembly Powered Telnet Chat
- Lunatic.chat – A WebAssembly powered telnet chat
- A telnet chat server powered by WebAssembly
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telnet lunatic.chat – A chat server for the terminal
The server is open source and written in Rust. The Rust code is then compiled to WebAssembly and runs on top of Lunatic. Each connection runs in a separate (lightweight) process, has it's own state and sends just a diff of esc-sequences back to the terminal to bring it up to date with the current render buffer. Everything is deployed to an ARM Linux box.
What are some alternatives?
crossterm - Cross platform terminal library rust
meetings - WebAssembly meetings (VC or in-person), agendas, and notes
Native Windows GUI - A light windows GUI toolkit for rust
lunatic - Lunatic is an Erlang-inspired runtime for WebAssembly
ncurses-rs - A low-level ncurses wrapper for Rust
chrono - Date and time library for Rust
Cursive - A Text User Interface library for the Rust programming language
embly - Attempt at building an opinionated webassembly runtime for web services
tui-rs - Build terminal user interfaces and dashboards using Rust
lumen - An alternative BEAM implementation, designed for WebAssembly
QML-rust - QML (Qt Quick) bindings for Rust language
mapscii - 🗺 MapSCII is a Braille & ASCII world map renderer for your console - enter => telnet mapscii.me <= on Mac (brew install telnet) and Linux, connect with PuTTY on Windows