Re: setup apm for 'battery low' warning on textconsole

[Jason Kraftcheck <kraftche@cae.wisc.edu>]

mi wrote:
> Hello,
> while i was roaming on a textconsole,  and the laptop only on battery, the 
> machine suddenly powered off.   Leaving it badly with filesystem checks.
> Now i wonder how to get a 'battery critical' warning yonder there .... ?

Here's some junk from my .bashrc to color the shell prompt according to 
the battery life:


APM="/usr/bin/apm"

if [ -x $APM ]; then

  function apm_percent()
  {
    state_line=$($APM)
    cut_leading=${state_line#*: }
    APM_PERCENT=${cut_leading%%%*}
    echo $APM_PERCENT
  }

  function apm_charge()
  {
    case "$($APM)" in
      *on-line*)
        APM_CHARGE="+" ;;
      *off-line*)
        APM_CHARGE="-" ;;
    esac
    echo $APM_CHARGE
  }

  function apm_color()
  {
    if  [  "$(apm_charge)"  =  "+"  ];  then
      echo  "1;37"
    else
      case  $(apm_percent)  in
         10?)  echo  "1;37"  ;;
          9?)  echo  "0;34"  ;;
          8?)  echo  "0;34"  ;;
          7?)  echo  "0;34"  ;;
          6?)  echo  "0;34"  ;;
          5?)  echo  "0;32"  ;;
          4?)  echo  "0;32"  ;;
          3?)  echo  "1;33"  ;;
          2?)  echo  "1;33"  ;;
          1?)  echo  "0;31"  ;;
           ?)  echo  "0;31;5"  ;;
           *)  echo  "0;35"  ;;
      esac
    fi
  }

  function  apm_color_prompt
  {
    PS1="\[\e[$(apm_color)m\]\h\$\[\e[0m\]  "
  }

  #  linux  console
  if  [  "$TERM"  =  "linux"  ];  then
    PROMPT_COMMAND=apm_color_prompt
  fi

  function  echo_apm
  {
    echo -n "($(apm_charge)$(apm_percent)) "
  }

  #  alternately echo apm state before prompt
  #  PROMPT_COMMAND = echo_apm
fi