#!/usr/bin/env bash

#--- is number functions
# https://stackoverflow.com/questions/806906/how-do-i-test-if-a-variable-is-a-number-in-bash/806923#806923
pb_isuint() { case $1        in '' | *[!0-9]*              ) return 1;; esac ;}
pb_isint()  { case ${1#[-+]} in '' | *[!0-9]*              ) return 1;; esac ;}
pb_isunum() { case $1        in '' | . | *[!0-9.]* | *.*.* ) return 1;; esac ;}
pb_isnum()  { case ${1#[-+]} in '' | . | *[!0-9.]* | *.*.* ) return 1;; esac ;}

#--- 256 colour functions 
# usage:
#  source ./pb
#  printf %b "$(pb_bg 196)$(pb_fg 254) RED $(pb_nc)\n"

pb_nc() {
  printf '\033[0;0m';
  exit;	
}

pb_fg() {

  if [ -z "$1" ] || ! pb_isuint "$1" ; then
    return 1
  fi
  
  local x
  x=$(tput colors)

  if (("$1" < 256)) && (("$x" > 255)); then
    printf %s "\033[38;5;$1m"
  fi

  return 0

}

pb_bg() {

  if [ -z "$1" ] || ! pb_isuint $1 ; then
    return 1
  fi

  local x
  x=$(tput colors)

  if (("$1" < 256)) && (("$x" > 255)); then
    printf %s "\033[48;5;$1m"
  fi

  return 0
}    
	
# end 256 colour functions