Colorized echo command

cecho.sh

#!/bin/sh

# source me in your script or .bashrc/.zshrc if wanna use cecho
# source '/path/to/cecho.sh'

# check this var to detect "cecho" being imported
CECHO_IS_IMPORTED=1

cecho()
{
	#FOREGROUND

	local FG_BLACK="\e[30m"
	local FG_RED="\e[31m"
	local FG_GREEN="\e[32m"
	local FG_YELLOW="\e[33m"
	local FG_BLUE="\e[34m"
	local FG_PURPLE="\e[35m"
	local FG_CYAN="\e[36m"
	local FG_WHITE="\e[37m"

	#BACKGROUND

	local BG_BLACK="\e[40m"
	local BG_RED="\e[41m"
	local BG_GREEN="\e[42m"
	local BG_YELLOW="\e[43m"
	local BG_BLUE="\e[44m"
	local BG_PURPLE="\e[45m"
	local BG_CYAN="\e[46m"
	local BG_WHITE="\e[47m"

	#ACTION

	local DONE="\e[0m"
	local HIGHLIGHT="\e[1m"
	local UNDERLINE="\e[4m"
	local BLINK="\e[5m"
	local REVERSE="\e[7m"
	local INVISIBLE="\e[8m"

	# for Bash compatibility

	local WS="\\ "

	# for self-adapting: inactive if output is pipe/file, active if screen

	local CECHO_IS_INACTIVE_INTL=$CECHO_IS_INACTIVE
	if [ ! -t 1 ]
	then
		CECHO_IS_INACTIVE_INTL=1
	fi

	# for keeping format when inactive

	local IS_NEED_BLANK=
	local INTL_SINGLE_BLANK=

	# other

	local msg=
	
	local version_info='cecho \
		cecho -B 0.21 -B "<https://github.com/springlie/cecho>" -n \
		Written -B by -B Springlie -B "<[email protected]>"'

	local help_info='cecho \
		-r -hl -re -t -t -t -t "the page is generated by" -B -bl "cecho" -d -r -hl -re -t -t -t -t -d -n \
		-hl Usage: -d -n \
		-t "a light and simple wrapper of echo, with colour flags." -d -n -n \
		-hl Syntax: -d -n \
		-t -g -hl cecho -d -B -y -color1 -B -b message1 -w -B "[ -color2 message2 ... ]" -r -B "[ -done ]" -d -n \
		-t -g -hl cecho -d -B -y -fg_color -B -p -bg_color -B -c -action -B -b message -B -w "[...]" -B -r "[ -done ]" -d -n -n \
		-hl "ForeGround color flag:" -d -n \
		-t -r "-r | -red" -t -g "-g | -green" -t -y "-y | -yellow" -t -bk -bw "-bk | -black" -d "(here with white bg)" -d -n \
		-t -b "-b | -blue" -t -p "-p | -purple" -t -c "-c | -cyan" -t -w "-w | -gr | -white | -gray" -d -n -n \
		-hl "BackGround color flag:" -d -n \
		-t -br "-br | -b_red" -t -bg "-bg | -b_green" -t -by "-by | -b_yellow" -t -bbk "-bbk | -b_black" -d -n \
		-t -bb "-bb | -b_blue" -t -bp "-bp | -b_purple" -t -bc "-bc | -b_cyan" -t -bw "-bw | -bgr | -b_white | -b_gray" -d -n -n \
		-hl "Action flag:" -d -n \
		-t "-d  | -done" -t -hl "-hl | -highlight" -d -t -ul "-ul | -underline" -d -t -re "-re | -reverse" -d -n \
		-t -bl "-bl | -blink" -d -t "[ there is invisible here ]" -t "-->" -iv "-iv | -invisible" -d "<--" -n -n \
		-hl "Escaped character:" -d -n \
		-t "-B | -blank" -t "-t | -tab" -t "-n | -newline" -d -n \
		-g -hl -re -t -t -t -t "the src of above (as an example)" -t -t -t -d'

	# main looooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooop

	while (($#!=0))
	do

		# set internal single blank(avoid duplicate blanks in inactive mode)

		if [ -z $IS_NEED_BLANK ]
		then
			INTL_SINGLE_BLANK=""
		else
			INTL_SINGLE_BLANK=" "
		fi

		IS_NEED_BLANK=

		
	# switch

	case $1 in

		# escape character

		-B|-blank  |$WS-B|$WS-blank  )msg+=" " ;	;;
		-t|-tab    |$WS-t|$WS-tab    )msg+="\t";	;;
		-n|-newline|$WS-n|$WS-newline)msg+="\n";	;;

		# foreground color

		-bk|-black |$WS-bk|$WS-black       )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $FG_BLACK || echo $INTL_SINGLE_BLANK);   ;;
		-r |-red   |$WS-r |$WS-red         )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $FG_RED   || echo $INTL_SINGLE_BLANK);   ;;
		-g |-green |$WS-g |$WS-green       )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $FG_GREEN || echo $INTL_SINGLE_BLANK);   ;;
		-y |-yellow|$WS-y |$WS-yellow      )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $FG_YELLOW|| echo $INTL_SINGLE_BLANK);   ;;
		-b |-blue  |$WS-b |$WS-blue        )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $FG_BLUE  || echo $INTL_SINGLE_BLANK);   ;;
		-p |-purple|$WS-p |$WS-purple      )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $FG_PURPLE|| echo $INTL_SINGLE_BLANK);   ;;
		-c |-cyan  |$WS-c |$WS-cyan        )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $FG_CYAN  || echo $INTL_SINGLE_BLANK);   ;;
		-w |-white |$WS-w |$WS-white       )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $FG_WHITE || echo $INTL_SINGLE_BLANK);   ;;
		-gr|-gray  |$WS-gr|$WS-gray        )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $FG_WHITE || echo $INTL_SINGLE_BLANK);   ;;

		# background color

		-bbk|-b_black |$WS-bbk|$WS-b_black )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $BG_BLACK || echo $INTL_SINGLE_BLANK);   ;;
		-br |-b_red   |$WS-br |$WS-b_red   )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $BG_RED   || echo $INTL_SINGLE_BLANK);   ;;
		-bg |-b_green |$WS-bg |$WS-b_green )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $BG_GREEN || echo $INTL_SINGLE_BLANK);   ;;
		-by |-b_yellow|$WS-by |$WS-b_yellow)msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $BG_YELLOW|| echo $INTL_SINGLE_BLANK);   ;;
		-bb |-b_blue  |$WS-bb |$WS-b_blue  )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $BG_BLUE  || echo $INTL_SINGLE_BLANK);   ;;
		-bp |-b_purple|$WS-bp |$WS-b_purple)msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $BG_PURPLE|| echo $INTL_SINGLE_BLANK);   ;;
		-bc |-b_cyan  |$WS-bc |$WS-b_cyan  )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $BG_CYAN  || echo $INTL_SINGLE_BLANK);   ;;
		-bw |-b_white |$WS-bw |$WS-b_white )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $BG_WHITE || echo $INTL_SINGLE_BLANK);   ;;
		-bgr|-b_gray  |$WS-bgr|$WS-b_gray  )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $BG_WHITE || echo $INTL_SINGLE_BLANK);   ;;

		# action, some can be overlaid

		-d |-done     |$WS-d |$WS-done     )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $DONE	    || echo $INTL_SINGLE_BLANK);   ;;
		-hl|-highlight|$WS-hl|$WS-highlight)msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $HIGHLIGHT|| echo $INTL_SINGLE_BLANK);   ;;
		-ul|-underline|$WS-ul|$WS-underline)msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $UNDERLINE|| echo $INTL_SINGLE_BLANK);   ;;
		-bl|-blink    |$WS-bl|$WS-blink    )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $BLINK    || echo $INTL_SINGLE_BLANK);   ;;
		-re|-reverse  |$WS-re|$WS-reverse  )msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $REVERSE  || echo $INTL_SINGLE_BLANK);   ;;
		-iv|-invisible|$WS-iv|$WS-invisible)msg+=$([ -z $CECHO_IS_INACTIVE_INTL ] && echo $INVISIBLE|| echo $INTL_SINGLE_BLANK);   ;;

		# functional

		-v|-version|--version|$WS-v|$WS-version|$WS--version)
			eval $version_info
			return 0
		;;

		-h|-help|--help|$WS-h|$WS-help|$WS--help)
			eval $help_info

			if [ $0 "==" "bash" ]
			then
				echo $help_info | sed -r 's/\\/\\\n/g'
			else
				echo $help_info
			fi

			return 0
		;;

		# string

		*)
			msg=$msg$1
			
			# reset

			IS_NEED_BLANK=1
		;;

	esac
	shift
	done

	# clear

	msg=$DONE$msg$DONE

	# print

	echo -e $msg
}