#!/usr/bin/env bash

#--- colour functions
# tested on 16/88/256/truecolor TERM definitions
# limited to 256 colours
# usage:
#   source ./pb
#   printf %b "$(pb_bg 196)$(pb_fg 254) RED $(pb_nc)\n"

pb_ctest() {

  if [ -z "$TERM" ] ; then
    return 1
  fi
  
  case $1 in '' | *[!0-9]* ) return 1;; esac

  local x
  x=$(tput colors)

  if [ -z "$1" ] || (("$1" >= "$x")) ; then
    return 1
  fi
  
  return 0
}

pb_terminfo() {
  local x
  x=$(tput colors)
  echo "TERM = $TERM : $x colours supported"	
}

pb_nc() {

    printf '\033[0;0m'
    return 0
    
}

pb_fg() {

  if pb_ctest $1; then
    printf %s "\033[38;5;$1m"
    return 0
  else
    return 1
  fi

}

pb_bg() {

  if pb_ctest $1; then
    printf %s "\033[48;5;$1m"
    return 0
  else
    return 1
  fi

}    

pb_ef() {

	case $1 in

	  "bold")
	    printf %s "\033[1m"
	    return 0
	    ;;

	  "dim")
	    printf %s "\033[2m"
	    return 0
	    ;;

	  "italic")
	    printf %s "\033[3m"
	    return 0
	    ;;
	    
	  "underline")
	    printf %s "\033[4m"
	    return 0
	    ;;

	  "blink")
	    printf %s "\033[5m"
	    return 0
	    ;;
	    
	  "reverse")
	    printf %s "\033[7m"
	    return 0
	    ;;

	  "hidden")
	    printf %s "\033[8m"
	    return 0
	    ;;
	    
	   "strikethrough")
	    printf %s "\033[9m"
	    return 0
	    ;;

	  *)
	    return 1
	    ;;
esac

}	

# end 256 colour functions