A text-based status bar written in Haskell. It was written solely for my personal use with the i3 and Sway window managers on my systems running Arch Linux, so customisability is very limited outside of editing the source code, and it may depend on external packages that are unavailable on other systems.
The program should be called with command-line arguments constituting a space-separated list of blocks. The output for the listed blocks should then be displayed in the order listed, with a new line printed each time the output text for one of the blocks updates.
> ./statusbar volume battery datetime
| Volume: Muted | Battery: 86% | Sunday 20/05/2018 @ 00:16
| Volume: Muted | Battery: 86% | Sunday 20/05/2018 @ 00:17
| Volume: Muted | Battery: 85% | Sunday 20/05/2018 @ 00:17
| Volume: Muted | Battery: 85% | Sunday 20/05/2018 @ 00:18
...
Blocks are named IO actions which each independently execute in their own thread.
Periodically, a block will write some text to an MVar shared by all threads, prompting the main thread to update the text of the statusbar if anything has changed.
All blocks are currently implemented in the same way:
- A command to obtain the desired information from the external system. These are run by the
System.Processlibrary. - A parser to transform the raw output of the command into the string which will actually be displayed. This uses the
Data.Attoparsec.Textlibrary. - Logic to determine when to re-run the command and parser, pushing the output to the main thread.
The currently implemented blocks and the external commands they depend upon are listed below.
| Block Name | Command |
|---|---|
battery |
acpi |
datetime |
date |
dropbox |
dropbox-cli |
solaredge |
curl |
sync |
inotifywait |
playerctl |
playerctl |
volume |
amixer |
Additionally, the solaredge block requires the SOLAR_EDGE_SITE and SOLAR_EDGE_API_KEY environment variables to be set to gain access to the SolarEdge monitoring API.