76 lines
1.8 KiB
Bash
Executable File
76 lines
1.8 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Print out escape sequences usable for coloured text on tty.
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# shellcheck disable=2016
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printf 'Colour escapes are %s\n' '\e[${value};...;${value}m'
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printf 'Values 30..37 are \e[33mforeground colours\e[m\n'
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printf 'Values 40..47 are \e[43mbackground colours\e[m\n'
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printf 'Value 1 gives a \e[1mbold look\e[m\n'
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printf 'Value 2 gives a \e[2mdim look\e[m\n'
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printf 'Value 3 gives a \e[3mitalic look\e[m\n'
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printf 'Value 4 gives a \e[4munderlined look\e[m\n'
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printf 'Value 5 gives a \e[5mblinking look\e[m\n\n'
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# foreground colours
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for fgc in {30..37}; do
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# background colours
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for bgc in {40..47}; do
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fgc=${fgc#37} # white
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bgc=${bgc#40} # black
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vals="${fgc:+$fgc};${bgc}"
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vals=${vals%%;}
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seq0="${vals:+\e[${vals}m}"
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printf " %-9s" "${seq0:-(default)}"
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echo -en " ${seq0}TEXT\e[m"
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echo -en " \e[${vals:+${vals+$vals}};1mBOLD\e[m"
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echo -en " \e[${vals:+${vals+$vals}};2mDIM\e[m"
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echo -en " \e[${vals:+${vals+$vals}};3mITA\e[m"
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echo -en " \e[${vals:+${vals+$vals}};4mUND\e[m"
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echo -en " \e[${vals:+${vals+$vals}};5mBLI\e[m"
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done
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echo; echo
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done
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rainbowColor() {
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local h=$(($1 / 43))
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local f=$(($1 - 43 * h))
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local t=$((f * 255 / 43))
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local q=$((255 - t))
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if [ $h -eq 0 ]
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then
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echo "255 $t 0"
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elif [ $h -eq 1 ]
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then
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echo "$q 255 0"
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elif [ $h -eq 2 ]
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then
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echo "0 255 $t"
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elif [ $h -eq 3 ]
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then
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echo "0 $q 255"
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elif [ $h -eq 4 ]
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then
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echo "$t 0 255"
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elif [ $h -eq 5 ]
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then
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echo "255 0 $q"
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else
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# execution should never reach here
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echo '0 0 0'
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fi
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}
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rf(){ echo "$1" 0 0; }; gf(){ echo 0 "$1" 0; }; bf(){ echo 0 0 "$1"; }
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for f in rf gf bf rainbowColor; do
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for s in "$(seq 0 127)" "$(seq 255 -1 128)"; do
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for i in $s; do
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# shellcheck disable=2183,2046
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printf '\x1b[48;2;%s;%s;%sm ' $($f "$i")
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done
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echo -en "\x1b[0m\n"
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done
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done
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