colors

#!/bin/bash
#
# Display supported terminal color palette and available text effects.
#
# - Display the palette:
#
# `colors`
#
# ---
# Author: Nick Plekhanov, https://nikkhan.com/
# License: MIT
# https://github.com/nicksp/dotfiles

set -euo pipefail

CYAN="$(tput setaf 6)"
UNDERLINE="$(tput sgr 0 1)"
RESET="$(tput sgr0)"

title() {
  echo
  echo -e "${UNDERLINE}${CYAN}${1}${RESET}"
  echo
}

# Represent the 16 base colors in the 256-color palette
for row in {0..15}; do
  # Represent the 16 shades of each base color
  for col in {0..15}; do
    color=$((row * 16 + col))
    color_code=$(printf "%03d" $color)

    echo -en "\033[48;5;${color}m\033[1m $color_code \033[0m\033[38;5;${color}m\033[0m"
  done
  echo
done

title "Escape sequences"

echo "Effects:"
echo -e "1:             \033[1mBold\033[0m"
echo -e "2:             \033[2mDimmed\033[0m"
echo -e "3:             \033[3mItalic\033[0m"
echo -e "4:             \033[4mUnderline\033[0m"
echo -e "5:             \033[5mBlinking\033[0m"
echo -e "6:             \033[6mBlinking fast\033[0m"
echo -e "7:             \033[7mInverted\033[0m"
echo -e "8 (invisible): \033[8mInvisible\033[0m"
echo
echo "Examples:"
echo -e "\\\033\[33;44;1m  \033[33;44;1myellow on blue, bold\033[0m \\\033\[0m"
echo -e "\\\033\[38;5;219m \033[38;5;219m256-color foreground\033[0m \\\033\[0m"
echo -e "\\\033\[48;5;61m  \033[48;5;61m256-color background\033[0m \\\033\[0m"

title "Tput commands"

echo "Effects:"
echo "bold:  $(tput bold)Bold$RESET"
echo "dim:   $(tput dim)Dim$RESET"
echo "sitm:  $(tput sitm)Italic$RESET"
echo "smul:  $(tput smul)Underline$RESET"
echo "blink: $(tput blink)Blinking$RESET"
echo "rev:   $(tput rev)Inverted$RESET"
echo "invis: $(tput invis)Invisible$RESET"
echo
echo "Examples:"
echo "\$(tput setaf 3)\$(tput setab 4)\$(tput bold) $(tput setaf 3)$(tput setab 4)$(tput bold)$(tput)yellow on blue, bold$RESET \$(tput sgr0)"
echo "\$(tput setaf 153)                          $(tput setaf 153)256-color foreground$RESET \$(tput sgr0)"
echo "\$(tput setab 128)                          $(tput setab 128)256-color background$RESET \$(tput sgr0)"