powerline-rs

powerline-rs is a rewrite of powerline-shell, inspired by powerline-go.

Note: powerline-rs is in somewhat of a maintenance mode. I’ll try to make time to fix bugs and add new features, but the code is messy and I will not be fixing it any time soon unfortunately. It could be reworked to be more generic and maybe read a config file for the prompt, since it’s still going to be very fast thanks to rust. But I’m not going to implement that. Not now, at least.

/That said,/ I still use this for my own prompt and will probably never stop, so don’t worry it’s definitely not a dead project.

Why?

Speed! I haven’t done any extensive benchmarks, but it appears like even the debug version of powerline-rs is about 20 milliseconds faster than powerline-go. The Rust language is perfect for fast applications, since copying large structures isn’t implicit.

How to install

I strongly recommend installing powerline-rs using the Nix package manager, which will get you all the required native dependencies by default.

nix-env -iA powerline-rs

If you’d prefer the absolutely latest git version, you can use this instead:

nix-env -if https://gitlab.com/jD91mZM2/powerline-rs/-/archive/master.tar.gz

Then add the following code to your shell:

• Bash
• Fish
• Ion
• Zsh

Other installation options

You can also install powerline-rs from an unofficial AUR package.

Using other installation options you’ll unfortunately have to fetch all native dependencies yourself. I’ve tried to guess which dependencies most users will need to install to build this, feel free to update the following matrix if it proves outdated.

Configuration	Native dependencies	Description
Default	All of the below
–no-default-features	None of the below
–features chrono	None	Add time support for `–shell bare`
–features flame	None	Adds some performance benchmarks. Don’t use this.
–features git2	libgit2, libzip	Add git support
–features users	None	Add username support for `–shell bare`

You’ll also need Rust, obviously. After that you can install powerline-rs via cargo.

cargo install powerline-rs

What’s new?

Well, the default modules have changed to not include the username and hostname. I feel like most people already know theirs. But you can always enable it, of course!

What’s optimized?

• Generally just using Rust.
• Using libgit2 over calling and parsing git output (Thanks tbodt for suggesting it!)
• libgit2 can be disabled at compile time if you don’t plan on using git functionality.
• Themes are using a simple small key=value scripts. No JSON overhead or similar.
• The output of powerline-rs is slightly smaller than the 2 alternatives I mentioned. To be honest, I have no idea why.

What’s removed?

Most of the service-specific modules are deleted. I am very lazy. Pull requests are welcome, though.

Also, the jobs module won’t work with --shell bare.

Add it to your shell

Bash

prompt() {
    PS1="$(powerline-rs --shell bash $?)"
}
PROMPT_COMMAND=prompt

Zsh

prompt() {
    PS1="$(powerline-rs --shell zsh $?)"
}
precmd_functions+=(prompt)

Fish

function fish_prompt
    powerline-rs --shell bare $status
end

Ion

We can’t display the success status because ion now forbids the use $? from functions as a bi-product of the new namespacing system. This will of course eventually be resolved.

fn PROMPT
    powerline-rs --shell bare
end

Themes

User contributed themes are found in contrib/ You can define usage of a theme with argument –theme ~/.dotfiles/powerline-rs/solarized.theme If no theme is defined the default theme will be used.