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63 lines
1.1 KiB
Bash
63 lines
1.1 KiB
Bash
#!/usr/bin/env bash
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trap 'tput sgr0' exit # Clean up even if user hits ^C
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function setfg () {
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printf '\e[38;5;%dm' $1
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}
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function setbg () {
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printf '\e[48;5;%dm' $1
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}
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function showcolors() {
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# Given an integer, display that many colors
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for ((i=0; i<$1; i++))
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do
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printf '%4d ' $i
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setbg $i
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tput el
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tput sgr0
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echo
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done
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tput sgr0 el
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}
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### Main starts here
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# First, test if terminal supports OSC 4 at all.
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printf '\e]4;%d;?\a' 0
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read -d $'\a' -s -t 0.1 </dev/tty
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if [ -z "$REPLY" ]
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then
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# OSC 4 not supported, so we'll fall back to terminfo
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max=$(tput colors)
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else
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# OSC 4 is supported, so use it for a binary search
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min=0
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max=256
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while [[ $((min+1)) -lt $max ]]
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do
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i=$(( (min+max)/2 ))
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printf '\e]4;%d;?\a' $i
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read -d $'\a' -s -t 0.1 </dev/tty
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if [ -z "$REPLY" ]; then
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max=$i
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else
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min=$i
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fi
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done
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fi
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# If -v is given, show all the colors
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case ${1-none} in none)
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echo $max;;-v)
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showcolors $max;;*)
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if [[ "$1" -gt 0 ]]; then
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showcolors $1
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else
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echo $max
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fi
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;;
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esac | less --raw-control-chars --QUIT-AT-EOF --no-init |