Bash Colors and Text Style Demonstration

demo-bash-colors.sh

#!/bin/bash

# Bash Color and Style Demonstration
# Author: Yukal Alexander <yukal@email.ua>
# License MIT
# Version: 3.0
#
# UTF-8 encoding table and Unicode characters
# https://www.utf8-chartable.de/unicode-utf8-table.pl?start=9472&unicodeinhtml=dec

# brick="■"
brick="██"
brick2="▓▓"
brick3="▒▒"
brick4="░░"
# empty="✕"
empty="◉"

reset() { printf "\033[m"; }
wrap() { printf " \033[$1\033[0m"; }
color256() {
    local color=2;
    local str=$brick
    if [ -n "$1" ]; then color=$1; fi
    if [ -n "$2" ]; then str=$2; fi
    printf "\033[38;05;${color}m${str}\033[m";
}

table_c16() {
    for color in {0..15}; do
        if (($color % 8 == 0)); then echo; fi
        color256 $color $1;
        if (($color ==  6)); then printf "  $(color256 8 $1)"; fi
        if (($color == 14)); then printf "  $(color256 7 $1)"; fi
    done
    echo ;
}

grayscale() {
    printf "                  $(color256 8 $1)              $(color256 7 $1)              $(color256 15 $1)";
    echo ;
    color256 0 $1;
    for ((color=232; color<256; color++)); do
        color256 $color $1;
    done
    color256 15 $1;
    echo -e "\n";
}

triplex() {
    if (( $1 < 10 )); then
        out="00"$1;
    elif (( $1 < 100 )); then 
        out="0"$1;
    else
        out=$1
    fi
    echo $out
}

table1() {
    for (( tab=0; tab<6; tab++ )); do
        for (( row=0; row<6; row++ )); do
            for (( col=1; col<7; col++ )); do

                color=$(( 15+(6*$tab)+($row*36)+$col ))

                if [ "$1" == "1" ]; then
                    color256 $color $(triplex $color)" "
                else
                    color256 $color $1
                fi

            done
        done
        echo ;
    done
    echo ;
}

table2() {
    for (( tab=0; tab<6; tab++ )); do
        for (( col=1; col<7; col++ )); do
            for (( row=0; row<6; row++ )); do

                if (( ($color-16) % 6 == 0 )); then
                    color=$(( 15+(6*$tab)+($row*36)+$col ))
                else
                    color=$(( 15+(6*$tab)+($row*36)+$col ))
                fi

                if [ "$1" == "1" ]; then
                    color256 $color $(triplex $color)" "
                else
                    color256 $color $1
                fi
            done
        done
        echo ;
    done
    echo ;
}

rgb_matrix() {
    local row1=( 016 052 088 124 160 196   016 017 018 019 020 021   016 017 018 019 020 021   016 232 233 234 235 )
    local row2=( 022 058 094 130 166 202   052 053 054 055 056 057   022 023 024 025 026 027   236 237 238 239 240 )
    local row3=( 028 064 100 136 172 208   088 089 090 091 092 093   028 029 030 031 032 033   241 242 243 244 245 )
    local row4=( 034 070 106 142 178 214   124 125 126 127 128 129   034 035 036 037 038 039   246 247 248 249 250 )
    local row5=( 040 076 112 148 184 220   160 161 162 163 164 165   040 041 042 043 044 045   251 252 253 254 255 )
    local row6=( 046 082 118 154 190 226   196 197 198 199 200 201   046 047 048 049 050 051    -1  -1  -1  -1 015 )

    for (( r=1; r<7; r++ )); do
        ARRAYNAME="row${r}"
        eval row=\( \${${ARRAYNAME}[@]} \)
        # echo "${row[@]}     ${ARRAYNAME}[${#row[@]}]"

        for (( col=0; col<${#row[@]}; col++ )); do
            if [ "$1" == "1" ]; then
                if [ "${row[$col]}" == "-1" ]; then
                    color256 235 "${empty}${empty}${empty} ";
                else
                    color256 "${row[$col]}" "${row[$col]} ";
                fi
            else
                if [ "${row[$col]}" == "-1" ]; then
                    color256 235 "${empty}${empty}";
                else
                    color256 "${row[$col]}" "$1";
                fi
            fi
        done
        echo ;
    done
    echo ;
}

rgb_matrix2() {
    local row1=(  051 045 039 033 027   021   235 240 245 250 255 )
    local row2=(  050 044 038 032 026   020   234 239 244 249 254 )
    local row3=(  049 043 037 031 025   019   233 238 243 248 253 )
    local row4=(  048 042 036 030 024   018   232 237 242 247 252 )
    local row5=(  047 041 035 029 023   017   016 236 241 246 251 )

    local row6=(  046 040 034 028 022   016   017 018 019 020 021 )

    local row7=(  082 076 070 064 058   052   053 054 055 056 057 )
    local row8=(  118 112 106 100 094   088   089 090 091 092 093 )
    local row9=(  154 148 142 136 130   124   125 126 127 128 129 )
    local row10=( 190 184 178 172 166   160   161 162 163 164 165 )
    local row11=( 226 220 214 208 202   196   197 198 199 200 201 )

    for r in {1..11}; do
        ARRAYNAME="row${r}"
        eval row=\( \${${ARRAYNAME}[@]} \)
        # echo "${row[@]}     ${ARRAYNAME}[${#row[@]}]"

        for (( col=0; col<${#row[@]}; col++ )); do
            if [ "$1" == "1" ]; then
                printf "\e[38;05;${row[$col]}m${row[$col]}\033[m ";
            else
                printf "\e[38;05;${row[$col]}m${1}\033[m";
            fi
        done
        echo ;
    done
    echo ;
}

bars() {
    for style in {100..107}; do
        ((color=style-70))
        printf "\e[${style};${color}m  ${style};${color} \033[0m "
        if (( (style-3) % 8 == 0)); then echo; fi
    done

    for mode in {1..2}; do
        for color in {30..37}; do
            ((bg=color+10))
            code="${mode};${bg};${color}"
            printf "\033[${code}m ${code} \033[0m "
        done
        echo ;
    done
    echo ;

    for mode in {1,0,2}; do
        for color in {30..37}; do
            code="${mode};7;${color}"
            printf "\033[${code}m  ${code} \033[0m "
        done
        echo ;
    done
    echo ;

    for foreground in {30..37}; do
        for background in {40..47}; do
            colors="${foreground};${background}"

            if (($foreground==$background-10));
                then mode=1; else mode=0;
            fi

            printf "\033[${mode};${colors}m   ${colors} \033[0m "
        done
        echo ;
    done
    echo ;
}

modes() {
    for mode in {1,0,2}; do
        for foreground in {30..37}; do
            printf "\e[${mode};${foreground}m    ${mode};${foreground}\033[0m  "
        done
        echo;
    done
    echo ;
}

textstyles() {
    local info=""
    declare -A STYLES=([3]=italic [4]=underline [5]=blink [6]=unknown [7]=inverse [8]=hidden [9]=strike [21]=underline2 [53]=overline)

    for s in "${!STYLES[@]}"; do
        info=$(color256 238 ${STYLES[$s]})
        echo -e " $s \t \033[${s};37m text \033[0m ${info}\n";
    done
    echo ;
}


reset;
clear && clear;

textstyles

# table_c16 "[T]";
# grayscale "[T]";
table_c16 "TE";
table_c16 "$brick";

echo ;

grayscale "TE";
grayscale "$brick";

echo -e "\n";

modes
bars

echo ;

table1 "$brick"
table1 "1"
table2 "$brick"
table2 "1"
rgb_matrix "$brick"
rgb_matrix "1"
# rgb_matrix2 "$brick"
# rgb_matrix2 "1"

reset;
exit 0;