Assuming that when you saw "full" that meant AC connected but fully charged,
here is what I have. Probably should be tested on all 3 platforms before
letting it fly as a finished utility. Works a peach on the Mac.
function getPowerSource
-- returns the current power source for a laptop
-- "AC" or "Battery"
-- requires caseSwitch()
switch the platform
case "MacOS"
-- thanks to Martin Koob, use-LC list
put shell ("pmset -g batt") into tSource
-- returns something like:
-- Currently drawing from 'AC Power'
-- -InternalBattery-0 99%; finishing charge; 0:00 remaining
return char 2 to -1 of word -2 of line 1 of tSource
break
case "Win32"
-- thanks to Bob Sneidar, use-LC list
put shell("WMIC Path Win32_Battery GetAvailability") into tSource
-- Line 3 will contain 2 if the battery is charging, 3 if running on
battery
put line 3 of tSource into tStatus
return caseSwitch(tStatus,"3=Battery","*=AC")
break
default
-- Unix, thanks to Richard Gaskin, use-LC list
put url "/sys/class/power_supply/BAT0/" into tStatus
if tSource = empty then put url "/sys/class/power_supply/BAT1/" into
tStatus
return
caseSwitch(tStatus,"discharging=Battery","charging,full=AC","*=*")
-- if non-standard,
-- just returns whatever "/sys/class/power_supply/BATx/" reports
end switch
end getPowerSource
-- Peter
Peter M. Brigham
pmb...@gmail.com
http://home.comcast.net/~pmbrig
On Mar 3, 2015, at 10:29 AM, Richard Gaskin wrote:
> Peter M. Brigham wrote:
> > So it looks from your links that I should use "/sys/class/power_supply
> > /BAT0/" for the URL on Unix, and check for "charging" or
> > "discharging" as the first word??
>
> ...or "full", as I saw last night while testing this.
>
> So far I'm only seeing one-word values, so using "word 1" would seem a safe
> choice - good call.
>
>
> We have one remaining mystery, however: my Dell has only one battery, but
> has no values at /sys/class/power_supply/BAT0/, instead using
> /sys/class/power_supply/BAT1/.
>
> I've read other cases online where folks find the same thing, but haven't
> found the definitive rule governing why.
>
> In my reading I also came across some laptop models (Toshiba came up a couple
> times) in which the battery firmware doesn't report its info in a standard
> way, making it more difficult for generalized utilities to obtain it. But
> frankly, if an OEM chooses to disregard published standards personally I
> can't see spending much time accommodating them, so I'm not too worried about
> such edge cases.
>
> Given all this, I would feel reasonably safe at this time with the following
> algorithm:
>
> First check BAT0/status
> If empty then
> check BAT1/status
> end if
> If both are empty there's probably no battery
> If a value is found then use it
>
> I've seen no mention of BAT2 or more, so I feel this should account for a
> reasonably useful range of contexts.
>
>
> My own goal here is to know whether I can feel save performing optional
> background processing which can improve performance but at the cost of
> battery life.
>
> So either "full" or "charging" implies that the laptop is plugged into a wall
> socket, so I'd proceed with those background tasks.
>
> And if no battery info can be found at all in either location (BAT0 or BAT1),
> it seems safe to assume we're not on a battery-powered device, so I'd also
> proceed with optional background tasks.
>
> So it's only when the status returns "discharging" that I know a battery is
> present and that it's not plugged into a wall socket, in which case I should
> at least let the user decide whether or not to run optional background tasks.
>
> --
> Richard Gaskin
> Fourth World Systems
> Software Design and Development for the Desktop, Mobile, and the Web
> ____________________________________________________________________
> ambassa...@fourthworld.com http://www.FourthWorld.com
>
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