Add BatteryStatus

[Uzlopak]

Well. How about providing the battery status, as described in mdn for navigator.getBattery()
https://developer.mozilla.org/en-US/docs/Web/API/Navigator/getBattery

Win:
https://learn.microsoft.com/en-us/windows/win32/power/battery-information

Mac:
https://developer.apple.com/documentation/iokit/iopowersources_h#topics

Linux:
Read the status from /sys/class/power_supply/

[bnoordhuis]

I guess? PR welcome.

macOS note: IOKit.framework should be loaded dynamically with dlopen, not linked against with -framework IOKit. See src/unix/darwin-proctitle.c for an example how to.

[juanarbol]

I can work on the macOS part :)

[juanarbol]

I can work on the linux for arm64, as well but I need a bit more time for it :)

[oluan]

I can work on Windows implementation soon

@juanarbol To ensure we're aligned, could you specify the features you're working on?

I've seen your PR and I'll use it to start my branch.

Specifically, are you planning to implement the BatteryManager browser interface as outlined here:

https://developer.mozilla.org/en-US/docs/Web/API/BatteryManager ?

[juanarbol]

Yes, once we have everything landed in libuv, I can implement the battery thing in Node.js

[juanarbol]

Are we sure about Linux? I tried reading from the power_supply folder, empty from a Raspberry Pi and from a AWS machine as well:

ubuntu@ip-172-31-11-139:~$ cat /sys/class/power_supply/
cat: /sys/class/power_supply/: Is a directory
ubuntu@ip-172-31-11-139:~$ cat /sys/class/power_supply/
cat: /sys/class/power_supply/: Is a directory
ubuntu@ip-172-31-11-139:~$ ls /sys/class/power_supply/
ubuntu@ip-172-31-11-139:~$ uname -a
Linux ip-172-31-11-139 6.2.0-1017-aws #17~22.04.1-Ubuntu SMP Fri Nov 17 21:07:13 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

[Uzlopak]

aras@aras-Lenovo-Legion-5-17ARH05H:~$ cat /sys/class/power_supply/BAT0/capacity
100

[juanarbol]

That works on laptops; for servers, it is empty; the same happens with macOS, I will propose returning a UV_EPERM when no resources available