Add support for termux-battery-status

internal/p10k.zsh

@@ -1268,6 +1268,9 @@ _p9k_prompt_battery_init() {
     _p9k__async_segments_compute+='_p9k_worker_invoke battery _p9k_prompt_battery_compute'
     return
   fi
+  if [[ -x `which termux-battery-status` ]] && [[ -x `which jq` ]]; then
+    return
+  fi
   if [[ $_p9k_os != (Linux|Android) ||
         -z /sys/class/power_supply/(CMB*|BAT*|battery)/(energy_full|charge_full|charge_counter)(#qN) ]]; then
     typeset -g "_p9k__segment_cond_${_p9k__prompt_side}[_p9k__segment_index]"='${:-}'
@@ -1328,8 +1331,7 @@ _p9k_prompt_battery_set_args() {
     Linux|Android)
       # See https://sourceforge.net/projects/acpiclient.
       local -a bats=( /sys/class/power_supply/(CMB*|BAT*|battery)/(FN) )
-      (( $#bats )) || return
-
+      if (( $#bats )); then
         local -i energy_now energy_full power_now
         local -i is_full=1 is_calculating is_charching
         local dir
@@ -1376,6 +1378,24 @@ _p9k_prompt_battery_set_args() {
             remain="..."
           fi
         fi
+
+      else
+        # See https://wiki.termux.com/wiki/Termux-battery-status
+        if [[ -x `which termux-battery-status` ]] && [[ -x `which jq` ]]; then
+          (( bat_percent = `termux-battery-status|jq -r .percentage` ))
+          state=`termux-battery-status|jq -r .status`
+          case $state in
+            NOT_CHARGING)
+              (( bat_percent < _POWERLEVEL9K_BATTERY_LOW_THRESHOLD )) && state=LOW || state=DISCONNECTED
+            ;;
+            CHARGING)
+              (( bat_percent == 100 )) && state=CHARGED
+            ;;
+          esac
+        else
+          return
+        fi
+      fi
     ;;
 
     *)