zsh Theme for the fantastic pocketCHIP, will display battery level and charging indicator

blinks-chip.zsh-theme

# https://github.com/blinks zsh theme
# edited to display pocketchip battery status by https://github.com/thiemok

function _prompt_char() {
  if $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then
    echo "%{%F{blue}%}±%{%f%k%b%}"
  else
    echo ' '
  fi
}

# This theme works with both the "dark" and "light" variants of the
# Solarized color schema.  Set the SOLARIZED_THEME variable to one of
# these two values to choose.  If you don't specify, we'll assume you're
# using the "dark" variant.

case ${SOLARIZED_THEME:-dark} in
    light) bkg=white;;
    *)     bkg=black;;
esac

ZSH_THEME_GIT_PROMPT_PREFIX=" [%{%B%F{blue}%}"
ZSH_THEME_GIT_PROMPT_SUFFIX="%{%f%k%b%K{${bkg}}%B%F{green}%}]"
ZSH_THEME_GIT_PROMPT_DIRTY=" %{%F{red}%}*%{%f%k%b%}"
ZSH_THEME_GIT_PROMPT_CLEAN=""

VOLTAGE_DROP=43
MAX_VOLTAGE=4202
MIN_VOLTAGE=3600
function batteryIndicator() {
  is_charging=$(cat /usr/lib/pocketchip-batt/charging)
  voltage=$(cat /usr/lib/pocketchip-batt/voltage)
  voltage_offset=$(bc <<< "$is_charging*$VOLTAGE_DROP")
  excess_voltage=$(bc <<< "$voltage-$voltage_offset-$MIN_VOLTAGE")
  max_excess_voltage=$(bc <<< "$MAX_VOLTAGE-$VOLTAGE_DROP-$MIN_VOLTAGE")
  percentage=$(bc <<< "scale=2; $excess_voltage/($max_excess_voltage/100)")
  battStatus="-" && [[ "$is_charging" == 1 ]] && battStatus="+"
  if (( $(bc <<< "$percentage < 20") ))
  then
    statusColor=red
  else
    statusColor=green
  fi
  echo "%B%F{${statusColor}}%}$percentage$battStatus"
}

PROMPT='%{%f%k%b%}
%{%K{${bkg}}%B%F{green}%}%n%{%B%F{blue}%}@%{%B%F{cyan}%}%m%{%B%F{green}%} %{%b%F{yellow}%K{${bkg}}%}%~%{%B%F{green}%}$(git_prompt_info)%E%{%f%k%b%}
%{%K{${bkg}}%}$(_prompt_char)%{%K{${bkg}}%} %#%{%f%k%b%} '

RPROMPT='!%{%B%F{cyan}%}%!%{%f%k%b%} - $(batteryIndicator)%{%f%k%b%}'