A re-implementation of powerline-shell in Scala
I was always using the powerling-shell created by milkbikis and I like it very much. But since it's a python script, sometimes it reponses slowly, maybe there's a way to make it fast but I decided to re-implement it using Scala, in a different structure.
The original python script is executed every time the shell prompt is evaluated. Since I implement it here using scala, it can't fit into the same structure because running a scala program means starting a java VM first, so it's not suitable for lots of short lived execution. For this reason, powerline-shell-scala is done in a client-server structure. There's a native client written in C, which sends all information needed over a socket to a local scala server, run as a system daemon. The result? I get a new shell prompt instantly.
It has all the basic features of powerline-shell: nice path segments rendering, git branches, error return code etc. It also adapts the prompt length according to the actual console window width: you have always 1/3 the place to type your commands.
You need to have gcc, scala and sbt to compile. Just type
make all
to compile. The compiled client is target/powerline-client, and the server jar is target/scala-{version}/powerline-shell-scala-assembly-0.1.0-SNAPSHOT.jar.
To use it, add this function in you .bashrc and then override the prompt command:
function _update_ps1() {
export PS1="$(PATH/TO/powerline-shell-scala/target/powerline-client $?)"
}
export PROMPT_COMMAND="_update_ps1 && other_stuff_that_you_had_before"Dont foget to run the server daemon at startup, you can put the command in .xinitrc:
java -Xmx50m -cp PATH/TO/powerline-shell-scala/target/scala-{version}/powerline-shell-scala-assembly-0.1.0-SNAPSHOT.jar PowerlineServerwhich will launch the server with maximum 50Mb of memory at startup.
As the original one, powerline uses some special symbols that maybe not included in your font. Consult this post for patching your favorite font.
Patched terminus font is included in repo, under font/terminus/.
Setup console fonts in ~/.Xresources like below:
URxvt.font: xft:Terminus:pixelsize=14:antialias=false:hinting=false:autohint=false, xft:Terminus (TTF) for Powerline:pixelsize=16:antialias=true:hinting=true:autohint=true
URxvt.boldFont: xft:Terminus:bold:pixelsize=14:antialias=false:hinting=false:autohint=false, xft:Terminus (TTF) for Powerline:bold:pixelsize=16:antialias=true:hinting=true:autohint=trueAs you can see the patched fonts are used as secondary fonts only to provide the special symbols needed.
- supports for other shells
- supports for other CVS