Lib.rs

• powerline-rs =powerline-rs= is a rewrite of [[https://github.com/b-ryan/powerline-shell][powerline-shell]], inspired by [[https://github.com/justjanne/powerline-go][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 [[https://nixos.org/nix/][Nix package manager]], which will get you all the required native dependencies by default.

#+BEGIN_SRC sh nix-env -iA powerline-rs #+END_SRC

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

#+BEGIN_SRC sh nix-env -if https://gitlab.com/jD91mZM2/powerline-rs/-/archive/master.tar.gz #+END_SRC

Then add the following code to your shell:

• [[#bash][Bash]]
• [[#fish][Fish]]
• [[#ion][Ion]]
• [[#zsh][Zsh]]

*** Other installation options You can also install powerline-rs from an [[https://aur.archlinux.org/packages/powerline-rs/][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which dependencies most users will need to install to build this, feel free to update the following matrix if it proves outdated.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.

#+BEGIN_SRC sh cargo install powerline-rs #+END_SRC

** 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 [[https://github.com/tbodt][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 #+BEGIN_SRC sh prompt() { PS1="$(powerline-rs --shell bash $?)" } PROMPT_COMMAND=prompt #+END_SRC ** Zsh #+BEGIN_SRC sh prompt() { PS1="$(powerline-rs --shell zsh $?)" } precmd_functions+=(prompt) #+END_SRC ** Fish #+BEGIN_SRC sh function fish_prompt powerline-rs --shell bare $status end #+END_SRC ** Ion We can't display the success status because ion now forbids the use =$?= from functions as a bi-product of the new [[https://gitlab.redox-os.org/redox-os/ion/merge_requests/807][namespacing system]]. This will of course eventually be resolved.

#+BEGIN_SRC sh fn PROMPT powerline-rs --shell bare end #+END_SRC