#!/usr/bin/env bash

#

# https://gist.github.com/SomeRandomiOSDev/798406a4a15f6b5d78b010599865c04f

#

# printformat.sh

# Usage example: ./formatstring.sh "forground:red;bold" "Hello, World"

# Help

function printhelp() {

IFS='%'

echo -e "printformat.sh [--help | -h] <format_string> <string_to_format>" 1>&2

unset IFS

exit 1

}

function printadvancedhelp() {

local HELP="Updates a string with a specified format and returns it.\n\n"

HELP+="printformat.sh [--help | -h] <format_string> <string_to_format>\n"

HELP+="\n"

HELP+="FLAGS:\n"

HELP+="\n"

HELP+="--help, -h) Print this help message and exit.\n"

HELP+="\n"

HELP+="ARGUMENTS:\n"

HELP+="\n"

HELP+="format_string: The format string with which to configure the input string. See\n"

HELP+=" \"FORMAT STRING\" section below for how to structure the format\n"

HELP+=" string.\n"

HELP+="\n"

HELP+="string_to_print: The string to be formatted\n"

HELP+="\n"

HELP+="FORMAT STRING:\n"

HELP+="\n"

HELP+="The format string is composed of a list of modifiers separated by semicolons.\n"

HELP+="Valid modifiers are:\n"

HELP+="\n"

HELP+="- \"bold\": Bolds the text (\x1B[1mBold\x1B[0m)\n"

HELP+="- \"dim\": Dims the text (\x1B[2mDim\x1B[0m)\n"

HELP+="- \"underline\": Underlines the text (\x1B[4mUnderline\x1B[0m)\n"

HELP+="- \"blink\": Blinks the text (\x1B[5mBlink\x1B[0m)\n"

HELP+="- \"invert\": Inverts the foreground and background colors of the text\n"

HELP+=" (\x1B[7mInvert\x1B[0m)\n"

HELP+="- \"hidden\": Hides the text (\x1B[8mHidden\x1B[0m)\n"

HELP+="\n"

HELP+="- \"foreground:<color>\": Sets the text color for the text. See COLORS for a\n"

HELP+=" list of valid colors. (\x1B[32mGreen Text\x1B[0m)\n"

HELP+="- \"background:<color>\": Sets the text color for the text. See COLORS for a\n"

HELP+=" list of valid colors. (\x1B[41mRed Background\x1B[0m)\n"

HELP+="\n"

HELP+="COLORS:\n"

HELP+="\n"

HELP+="Valid color names for the \"Foreground\" and \"Background\" are:\n"

HELP+="\n"

HELP+="- \"default\": Default color (\x1B[39mText\x1B[0m)\n"

HELP+="- \"black\": Black color (\x1B[30mText\x1B[0m)\n"

HELP+="- \"red\": Red color (\x1B[31mText\x1B[0m)\n"

HELP+="- \"green\": Green color (\x1B[32mText\x1B[0m)\n"

HELP+="- \"yellow\": Yellow color (\x1B[33mText\x1B[0m)\n"

HELP+="- \"blue\": Blue color (\x1B[34mText\x1B[0m)\n"

HELP+="- \"magenta\": Magenta color (\x1B[35mText\x1B[0m)\n"

HELP+="- \"cyan\": Cyan color (\x1B[36mText\x1B[0m)\n"

HELP+="- \"light-gray\": Light gray color (\x1B[37mText\x1B[0m)\n"

HELP+="- \"dark-gray\": Dark gray color (\x1B[90mText\x1B[0m)\n"

HELP+="- \"light-red\": Light red color (\x1B[91mText\x1B[0m)\n"

HELP+="- \"light-green\": Light green color (\x1B[92mText\x1B[0m)\n"

HELP+="- \"light-yellow\": Light yellow color (\x1B[93mText\x1B[0m)\n"

HELP+="- \"light-blue\": Light blue color (\x1B[94mText\x1B[0m)\n"

HELP+="- \"light-magenta\": Light magenta color (\x1B[95mText\x1B[0m)\n"

HELP+="- \"light-cyan\": Light cyan color (\x1B[96mText\x1B[0m)\n"

HELP+="- \"white\": White color (\x1B[97mText\x1B[0m)\n"

HELP+="\n"

HELP+="Additionally in lieu of a named color on terminals that support all 256 colors\n"

HELP+="any number between 0 and 256 can be used (e.g. \"foreground:98\").\n"

IFS='%'

echo -e "$HELP" 1>&2

unset IFS

exit 0

}

# Parse Arguments

while [[ $# -gt 0 ]]; do

case "$1" in

--help | -h)

printadvancedhelp

;;

*)

if [ -z ${FORMAT_STRING+x} ]; then

FORMAT_STRING="$1"

shift # <format_string>

elif [ -z ${INPUT_STRING+x} ]; then

INPUT_STRING="$1"

shift # <string_to_format>

else

echo -e "\x1B[31mExpected exactly two positional arguments\x1B[0m\n" 1>&2

printhelp

fi

;;

esac

done

if [[ -z ${FORMAT_STRING+x} ]] || [[ -z ${INPUT_STRING+x} ]]; then

echo -e "\x1B[31mExpected exactly two positional arguments\x1B[0m\n" 1>&2

printhelp

fi

# Functions

function invalid_format_string() {

echo -e "\x1B[31mInvalid format string: \"$1\"\x1B[0m\n" 1>&2

printhelp

}

# Parse Format Sring

FORMAT_COMPONENTS=()

INPUT_COMPONENTS=()

IFS=';' read -ra INPUT_COMPONENTS <<< "$FORMAT_STRING"

#

if [[ ${#INPUT_COMPONENTS[@]} -ge 1 ]]; then

for COMPONENT in "${INPUT_COMPONENTS[@]}"; do

case "$COMPONENT" in

"bold") FORMAT_COMPONENTS=(${FORMAT_COMPONENTS[@]} "1") ;;

"dim") FORMAT_COMPONENTS=(${FORMAT_COMPONENTS[@]} "2") ;;

"underline") FORMAT_COMPONENTS=(${FORMAT_COMPONENTS[@]} "4") ;;

"blink") FORMAT_COMPONENTS=(${FORMAT_COMPONENTS[@]} "5") ;;

"invert") FORMAT_COMPONENTS=(${FORMAT_COMPONENTS[@]} "7") ;;

"hidden") FORMAT_COMPONENTS=(${FORMAT_COMPONENTS[@]} "8") ;;

*)

IFS=':' read -ra COLOR_COMPONENTS <<< "$COMPONENT"

if [ "${#COLOR_COMPONENTS[@]}" == "2" ]; then

COLOR_COMPONENT="${COLOR_COMPONENTS[0]}"

COLOR_NAME="${COLOR_COMPONENTS[1]}"

case "$COLOR_COMPONENT" in

"foreground" | "background")

COLOR=0

if [ "$COLOR_COMPONENT" == "background" ]; then

COLOR=10

fi

#

case "$COLOR_NAME" in

"default") COLOR=$((COLOR+39)) ;;

"black") COLOR=$((COLOR+30)) ;;

"red") COLOR=$((COLOR+31)) ;;

"green") COLOR=$((COLOR+32)) ;;

"yellow") COLOR=$((COLOR+33)) ;;

"blue") COLOR=$((COLOR+34)) ;;

"magenta") COLOR=$((COLOR+35)) ;;

"cyan") COLOR=$((COLOR+36)) ;;

"light-gray") COLOR=$((COLOR+37)) ;;

"dark-gray") COLOR=$((COLOR+90)) ;;

"light-red") COLOR=$((COLOR+91)) ;;

"light-green") COLOR=$((COLOR+92)) ;;

"light-yellow") COLOR=$((COLOR+93)) ;;

"light-blue") COLOR=$((COLOR+94)) ;;

"light-magenta") COLOR=$((COLOR+95)) ;;

"light-cyan") COLOR=$((COLOR+96)) ;;

"white") COLOR=$((COLOR+97)) ;;

*)

if [[ $(echo "$COLOR_NAME" | grep -E "^(1?[0-9]{1,2}|2[0-4][0-9]|25[0-6])$") ]]; then # is it a number from 0-256

COLOR=$((COLOR+38))

COLOR="$COLOR;5;$COLOR_NAME"

else

invalid_format_string "$COLOR_COMPONENT:$COLOR_NAME"

fi

;;

esac

#

FORMAT_COMPONENTS=(${FORMAT_COMPONENTS[@]} "$COLOR")

;;

*)

invalid_format_string "$FORMAT_STRING"

;;

esac

else

invalid_format_string "$FORMAT_STRING"

fi

;;

esac

done

#

if [[ ${#FORMAT_COMPONENTS[@]} -gt 0 ]]; then

echo -e "\x1B[$(echo "${FORMAT_COMPONENTS[@]}" | tr ' ' ';')m${INPUT_STRING}\x1B[0m"

fi

else

invalid_format_string "$FORMAT_STRING"

fi