Temperature: use JSON output (-j) of sensors and add inputs whitelist

[arraypad]

It looks like JSON output has been available since 2017 so seems safe:
lm-sensors/lm-sensors#21

Also I've found the inputs whitelist useful to ignore irrelevant values. For example here's my block config:

[[block]]
block = "temperature"
collapsed = false
interval = 10
format = "CPU temp: {average}°"
chip = "nct6798-isa-0290"
good = 30
idle = 40
info = 50
warning = 65
inputs = ["CPUTIN"]

[ammgws]

LGTM.

It looks like JSON output has been available since 2017 so seems safe

I used to use Ubuntu 18.04 as a baseline but that seems to be on lm-sensors 3.4. However since 20.04 is out now I think we can say this is OK.

[ammgws]

Can you update the docs as well?

[arraypad]

Sure, I've updated blocks.md, but after running man/generate.sh I'm seeing lots of unrelated changes in the output, e.g.:

@@ -87,9 +86,9 @@ Show brightness for a specific device:
 .nf
 \f[C]
 [[block]]
-block = \[dq]backlight\[dq]
-device = \[dq]intel_backlight\[dq]
-\f[R]
+block\ =\ "backlight"
+device\ =\ "intel_backlight"
+\f[]

I'm not familiar enough with pandoc / man formatting to know if this is a problem. The output in man looks fine to me though. Would you like me to commit that too?

[ammgws]

Yeah there's always something going on with it. Commit it for now

[ammgws]

Thanks!