pkgs/profpatsch/display-infos: display remaining battery life

The battery life is displayed as an [sft] timespan.

1 files changed, 37 insertions, 5 deletions

diff --git a/pkgs/profpatsch/display-infos/default.nix b/pkgs/profpatsch/display-infos/default.nix
index 9dc510cd..97a13944 100644
--- a/pkgs/profpatsch/display-infos/default.nix
+++ b/pkgs/profpatsch/display-infos/default.nix
@@ -1,4 +1,4 @@
-{ lib, runCommand, writeText, python3, libnotify, sfttime }:
+{ lib, runCommand, writeText, python3, libnotify, bc, sfttime }:
 
 let
   name = "display-infos-0.1.0";
@@ -15,18 +15,48 @@ let
         with open(fn, 'r') as f:
             return int(f.read())
 
+    def seconds_to_sft(secs):
+        p = sub.Popen(["@bc@", "-l"], stdin=sub.PIPE, stdout=sub.PIPE)
+        (sft, _) = p.communicate(input="scale=2; obase=16; {} / 86400\n".format(secs).encode())
+        p.terminate()
+        return str(sft.strip().decode())
+
+    charging = readint("/sys/class/power_supply/AC/online")
+
     full = 0
     now  = 0
+    # this is "to charged" if charging and "to empty" if not
+    seconds_remaining = 0
     for bat in glob.iglob("/sys/class/power_supply/BAT*"):
 
+        # these files might be different for different ACPI/battery providers
+        # see the full list in acpi.c of the acpi(1) tool
+        # unit: who knows
         full += readint(path.join(bat, "energy_full"))
         now  += readint(path.join(bat, "energy_now" ))
+        # in unit?/hours, hopefully the same unit as above
+        # ACPI is a garbage fire
+        current_rate = readint(path.join(bat, "power_now"))
+
+        if current_rate == 0:
+          continue
+        elif charging:
+          seconds_remaining += 3600 * (full - now) / current_rate
+        else:
+          seconds_remaining += 3600 * now / current_rate
 
     bat = round( now/full, 2 )
-    ac = "🗲" if readint("/sys/class/power_supply/AC/online") else ""
+    ac = "🗲 " if charging else ""
+    sft_remaining = seconds_to_sft(seconds_remaining)
     date = sub.run(["date", "+%d.%m. %a %T"], stdout=sub.PIPE).stdout.strip().decode()
-    sfttime = sub.run(["${sfttime}/bin/sfttime"], stdout=sub.PIPE).stdout.strip().decode()
-    notify = "BAT: {}% {} | {} | {}".format(int(bat*100), ac, date, sfttime)
+    sftdate = sub.run(["@sfttime@"], stdout=sub.PIPE).stdout.strip().decode()
+    notify = "BAT: {percent}% {ac}{charge}| {date} | {sftdate}".format(
+      percent = int(bat*100),
+      ac = ac,
+      charge = "{} ".format(sft_remaining) if seconds_remaining else "",
+      date = date,
+      sftdate = sftdate
+    )
     sub.run(["@notify-send@", notify])
   '';
 
@@ -36,6 +66,8 @@ in
   } ''
     substitute ${script} script \
       --replace "@python3@" "${getBin python3}/bin/python3" \
-      --replace "@notify-send@" "${getBin libnotify}/bin/notify-send"
+      --replace "@notify-send@" "${getBin libnotify}/bin/notify-send" \
+      --replace "@bc@" "${getBin bc}/bin/bc" \
+      --replace "@sfttime@" "${getBin sfttime}/bin/sfttime"
     install -D script $out/bin/display-infos
   ''