1---
2title: Display xterm color palette
3url: xterm-color-palette.html
4date: 2023-05-25T12:00:00+02:00
5type: note
6draft: false
7---
8
9- `bash xterm-palette.sh` - will show you number of max colors available
10- `bash xterm-palette.sh -v` - will create a list of all colors with codes
11
12
13
14```sh
15#!/usr/bin/env bash
16# xterm-palette.sh
17
18trap 'tput sgr0' exit # Clean up even if user hits ^C
19
20function setfg () {
21 printf '\e[38;5;%dm' $1
22}
23
24function setbg () {
25 printf '\e[48;5;%dm' $1
26}
27
28function showcolors() {
29 # Given an integer, display that many colors
30 for ((i=0; i<$1; i++))
31 do
32 printf '%4d ' $i
33 setbg $i
34 tput el
35 tput sgr0
36 echo
37 done
38 tput sgr0 el
39}
40
41# First, test if terminal supports OSC 4 at all.
42printf '\e]4;%d;?\a' 0
43read -d $'\a' -s -t 0.1 </dev/tty
44if [ -z "$REPLY" ]
45then
46 # OSC 4 not supported, so we'll fall back to terminfo
47 max=$(tput colors)
48else
49 # OSC 4 is supported, so use it for a binary search
50 min=0
51 max=256
52 while [[ $((min+1)) -lt $max ]]
53 do
54 i=$(( (min+max)/2 ))
55 printf '\e]4;%d;?\a' $i
56 read -d $'\a' -s -t 0.1 </dev/tty
57 if [ -z "$REPLY" ]
58 then
59 max=$i
60 else
61 min=$i
62 fi
63 done
64fi
65
66
67# If -v is given, show all the colors
68case ${1-none} in
69 none)
70 echo $max
71 ;;
72 -v)
73 showcolors $max
74 ;;
75 *)
76 if [[ "$1" -gt 0 ]]; then
77 showcolors $1
78 else
79 echo $max
80 fi
81 ;;
82esac | less --raw-control-chars --QUIT-AT-EOF --no-init
83```