q-power_supply: init from tv's q

1 files changed, 126 insertions, 0 deletions

diff --git a/krebs/5pkgs/simple/q-power_supply.nix b/krebs/5pkgs/simple/q-power_supply.nix
new file mode 100644
index 000000000..87f900194
--- /dev/null
+++ b/krebs/5pkgs/simple/q-power_supply.nix
@@ -0,0 +1,126 @@
+{ gawk, gnused, writeDashBin }:
+
+writeDashBin "q-power_supply" ''
+  power_supply() {(
+    set -efu
+    uevent=$1
+    eval "$(${gnused}/bin/sed -n '
+      s/^\([A-Z_]\+=[0-9A-Za-z_-]*\)$/export \1/p
+    ' $uevent)"
+    case $POWER_SUPPLY_NAME in
+      AC)
+        exit # not battery
+        ;;
+    esac
+    exec </dev/null
+    exec ${gawk}/bin/awk '
+      function die(s) {
+        printf "%s: %s\n", name, s
+        exit 1
+      }
+
+      function print_hm(h, m) {
+        m = (h - int(h)) * 60
+        return sprintf("%dh%dm", h, m)
+      }
+
+      function print_bar(n, r, t1, t2, t_col) {
+        t1 = int(r * n)
+        t2 = n - t1
+        if (r >= .42)     t_col = "1;32"
+        else if (r >= 23) t_col = "1;33"
+        else if (r >= 11) t_col = "1;31"
+        else              t_col = "5;1;31"
+        return sgr(t_col) strdup("■", t1) sgr(";30") strdup("■", t2) sgr()
+      }
+
+      function sgr(p) {
+        return "\x1b[" p "m"
+      }
+
+      function strdup(s,n,t) {
+        t = sprintf("%"n"s","")
+        gsub(/ /,s,t)
+        return t
+      }
+
+      END {
+        name = ENVIRON["POWER_SUPPLY_NAME"]
+
+        charge_unit = "Ah"
+        charge_now = ENVIRON["POWER_SUPPLY_CHARGE_NOW"] / 10^6
+        charge_full = ENVIRON["POWER_SUPPLY_CHARGE_FULL"] / 10^6
+
+        current_unit = "A"
+        current_now = ENVIRON["POWER_SUPPLY_CURRENT_NOW"] / 10^6
+
+        energy_unit = "Wh"
+        energy_now = ENVIRON["POWER_SUPPLY_ENERGY_NOW"] / 10^6
+        energy_full = ENVIRON["POWER_SUPPLY_ENERGY_FULL"] / 10^6
+
+        power_unit = "W"
+        power_now = ENVIRON["POWER_SUPPLY_POWER_NOW"] / 10^6
+
+        voltage_unit = "V"
+        voltage_now = ENVIRON["POWER_SUPPLY_VOLTAGE_NOW"] / 10^6
+        voltage_min_design = ENVIRON["POWER_SUPPLY_VOLTAGE_MIN_DESIGN"] / 10^6
+
+        #printf "charge_now: %s\n", charge_now
+        #printf "charge_full: %s\n", charge_full
+        #printf "current_now: %s\n", current_now
+        #printf "energy_now: %s\n", energy_now
+        #printf "energy_full: %s\n", energy_full
+        #printf "energy_full: %s\n", ENVIRON["POWER_SUPPLY_ENERGY_FULL"]
+        #printf "energy_full: %s\n", ENVIRON["POWER_SUPPLY_ENERGY_FULL"] / 10^6
+        #printf "power_now: %s\n", power_now
+        #printf "voltage_now: %s\n", voltage_now
+
+        if (current_now == 0 && voltage_now != 0) {
+          current_now = power_now / voltage_now
+        }
+        if (power_now == 0) {
+          power_now = current_now * voltage_now
+        }
+        if (charge_now == 0 && voltage_min_design != 0) {
+          charge_now = energy_now / voltage_min_design
+        }
+        if (energy_now == 0) {
+          energy_now = charge_now * voltage_min_design
+        }
+        if (charge_full == 0 && voltage_min_design != 0) {
+          charge_full = energy_full / voltage_min_design
+        }
+        if (energy_full == 0) {
+          energy_full = charge_full * voltage_min_design
+        }
+
+        if (charge_now == 0 || charge_full == 0) {
+          die("unknown charge")
+        }
+
+        charge_ratio = charge_now / charge_full
+
+        out = out name
+        out = out sprintf(" %s", print_bar(10, charge_ratio))
+        out = out sprintf(" %d%", charge_ratio * 100)
+        out = out sprintf(" %.2f%s", charge_now, charge_unit)
+        if (current_now != 0) {
+          out = out sprintf("/%.1f%s", current_now, current_unit)
+        }
+        out = out sprintf(" %d%s", energy_full, energy_unit)
+        if (power_now != 0) {
+          out = out sprintf("/%.1f%s", power_now, power_unit)
+        }
+        if (current_now != 0) {
+          out = out sprintf(" %s", print_hm(charge_now / current_now))
+        }
+
+        print out
+      }
+    '
+  )}
+
+  for uevent in /sys/class/power_supply/*/uevent; do
+    power_supply "$uevent" || :
+  done
+''