A colors utility - a guide and a tool

bash_colors

#!/bin/bash

color() {
    out=""
    saved_in="$@"
    saved_in=${saved_in[@]//test} # remove the word 'test'

    while [ "${1-}" != "" ]; do
    PARAM=`echo $1 | awk -F= '{print $1}'`
    VALUE=`echo $1 | awk -F= '{print $2}'`
    case $PARAM in
        bold)       out="${out};01" ;;
        dim)        out="${out};02" ;;
        underline)  out="${out};04" ;;
        blink)      out="${out};05" ;;
        reverse)    out="${out};07" ;;
        hidden)     out="${out};08" ;;

        black)                      out="${out};30" ;;
        red)                        out="${out};31" ;;
        green)                      out="${out};32" ;;
        yellow)                     out="${out};33" ;;
        blue)                       out="${out};34" ;;
        magenta)                    out="${out};35" ;;
        cyan)                       out="${out};36" ;;
        gray | grey)                out="${out};37" ;;
        lblack | dgray | dgrey )    out="${out};90" ;; 
        lred)                       out="${out};91" ;;
        lgreen)                     out="${out};92" ;;
        lyellow)                    out="${out};93" ;;
        lblue)                      out="${out};94" ;;
        lmagenta)                   out="${out};95" ;;
        lcyan)                      out="${out};96" ;;
        white)                      out="${out};97" ;;

        bg_black)                           out="${out};40" ;;
        bg_red)                             out="${out};41" ;;
        bg_green)                           out="${out};42" ;;
        bg_yellow)                          out="${out};43" ;;
        bg_blue)                            out="${out};44" ;;
        bg_magenta)                         out="${out};45" ;;
        bg_cyan)                            out="${out};46" ;;
        bg_gray | bg_grey)                  out="${out};47" ;;
        bg_lblack | bg_dgray | bg_dgrey )   out="${out};100" ;; 
        bg_lred)                            out="${out};101" ;;
        bg_lgreen)                          out="${out};102" ;;
        bg_lyellow)                         out="${out};103" ;;
        bg_lblue)                           out="${out};104" ;;
        bg_lmagenta)                        out="${out};105" ;;
        bg_lcyan)                           out="${out};106" ;;
        bg_white)                           out="${out};107" ;;

        
        reset_color | fg_reset | default)   out="${out};39" ;;
        bg_reset_color | bg_reset)          out="${out};49" ;;
        reset | reset_all)                  out="${out};0" ;;
        test)                               print_test_output=1 ;;
        *)
            ;;
    esac
    shift
    done
    out="\033[${out:1}m"
    if [ "$print_test_output" == 1 ]; then
        color=$(echo -en $out)
        reset=$(echo -en '\033[0m')
        printf "${saved_in}: \\${out} \t ${color}This is a test of ${saved_in}.${reset}\n"
    else
        echo -en "${out}"
    fi
}

usage() {
    echo """
Outputs the requested terminal color escape sequences, by name, changing the current color.

If 'test' is one of the color names requested, then the current is not changed, 
 instead the escape sequence is displayed, along with a brief demo.

example: 
  > bash_colors cyan underline test
    cyan underline: \033[36;04m      $(bash_colors cyan underline)This is a test of cyan underline.$(bash_colors reset)

example usage in a script:
  echo \$(bash_colors blue)This text will be blue
  echo \$(bash_colors yellow bg_red)This text will be yellow on a red background
  echo \$(bash_colors green)This text will be green on a red background
  echo \$(bash_colors bg_reset cyan)This text will be cyan on a normal background
  echo \$(bash_colors reset)This text will be normal. You should usually reset before a newline.
"""


}

if [ -z "$1" ]; then usage; exit -1; fi

color $@

# sed -e '$d' "$0" # command to echo the source of the script minus this last line