'-' is a valid character for tags.
Commit 03e1c7d (module/network: Add link stats, 2022-04-30) introduced
two new tags for the network module: `ul-speed` and `dl-speed`. These
use the `-` character, that was previously never used in any tag.
We had two options: either change those tags to use `_` instead, or just
accept `-`s as a valid character. Going forward, I can see many people
deciding to name their tags with `-` instead of `_`, so I believe it is
better to just accept it once and for all.
Note that `-` cannot be used as the first character of a tag (e.g.
`-tag1`) since the `-` has a special meaning in `.yml` files. I don't
believe this will happen often, however, and should be easy to both
detect and correct if it does.
For channels that have a defined dB range, use that instead of the raw
volume range when calculating the volume percent.
Also use the same logic as alsamixer when calculating the percent from
the dB values: assume a linear scale if the dB range is “small
enough”, and otherwise normalize it against a logarithmic scale.
With this, yambar’s “percent” value matches alsamixer’s exactly.
The ‘volume’ tag remains unchanged - it always reflects the raw volume
values.
Instead, we add a new tag ‘dB’, that reflects the dB values.
Closes#202
Exports two new tags from network module, `ul-speed` and `dl-speed`.
Because these work through polling, poll-interval must be set.
Otherwise, these two tags always will be 0.
