Add a custom formatter for "pow" numbers.

[layus]

This PR is based on #471 just because I worked incrementally.

Instead of providing a pre-formatted string as the value for large
numbers (disk size, network bandwidth), I defined a new format that
accepts =, < and > as modifiers

Example:

format   result
>{}<     >1B<
>{:<}<   >1B     <
>{:>}<   >     1B<
>{:=}<   >1     B<

>{:>}<   > 118Mib/s<
>{:>}<   >11.8Mib/s<
>{:>}<   >1.18Mib/s<
>{:>}<   > 121kib/s<

>{:>}<   > 123Mb/s<
>{:>}<   >12.3Mb/s<
>{:>}<   >1.23Mb/s<
>{:>}<   > 123kb/s<

[Alexays]

Could you also rebase this PR, and update the wiki for the disk module on github? ❤️

[layus]

Yes, sure !

[layus]

Wiki updated :-)

[Alexays]

Thanks a lot ❤️

[dschrempf]

Just saw this thread and, wow, thank you! I did NOT find this in the Wiki! Maybe it could be promoted a bit more!

[layus]

@dschrempf To be honnest, the feature still has some bugs where a stray "e" sometimes appears where it should not. Rounding errors ? Some float artifact ?

Just saw this thread and, wow, thank you! I did NOT find this in the Wiki! Maybe it could be promoted a bit more!

I would be glad to make changes. Could you tell me where you searched for that information ? It would help even more if you could make yourself a fix that matches your search.

Anyway, glad that I was useful to at least one person :-).

[layus]

@dschrempf Do you like the updated wiki ? https://github.com/Alexays/Waybar/wiki/FAQ/_compare/8b9b0dfc0881303eecfb9f828e1715c0cc083753

[dschrempf]

Thank you, this is very accessible and also clear!