.bin/bash-colors

   1 #!/bin/bash
   2 # Author: Mike Frysinger <vapier@gmail.com>; released into the public domain; suck it.
   3
   4 # This is for bash.
   5 BASH_PREFIX="\e"
   6 # And this is the portable one.
   7 POSIX_PREFIX="\033"
   8 # Default to bash.
   9 PREFIX=${BASH_PREFIX}
  10
  11 show_env() {
  12         local c colors=(
  13                 GOOD="\$'${PREFIX}[32;01m'"
  14                 WARN="\$'${PREFIX}[33;01m'"
  15                 BAD="\$'${PREFIX}[31;01m'"
  16                 HILITE="\$'${PREFIX}[36;01m'"
  17                 BRACKET="\$'${PREFIX}[34;01m'"
  18                 NORMAL="\$'${PREFIX}[0m'"
  19         )
  20         for c in "${colors[@]}" ; do
  21                 [[ -t 0 ]] || c="${c%=*}="
  22                 echo "${c}"
  23         done
  24 }
  25
  26 check256() {
  27         if [[ ${TERM} != *-256color ]] ; then
  28                 (
  29                 echo "warning: TERM (${TERM}) does not end in '-256color';"
  30                 echo "warning: trying to use 256 colors might not work."
  31                 ) >&2
  32         fi
  33 }
  34
  35 showit() {
  36         local col="${PREFIX}[${1};${2}m"
  37         printf '%bthis color is: %s   %b\n' "${col}" "${col}" "${PREFIX}[0m"
  38 }
  39
  40 main() {
  41         if [[ $1 == "--posix" ]] ; then
  42                 PREFIX=${POSIX_PREFIX}
  43                 shift
  44         fi
  45         case $1 in
  46         --env)
  47                 show_env
  48                 ;;
  49         ""|16|system)
  50                 for i in {0..1} ; do
  51                         for j in {30..37} ; do
  52                                 showit ${i} ${j}
  53                         done
  54                 done
  55                 ;;
  56         cube|6x6x6)
  57                 check256
  58                 for n in {16..231} ; do
  59                         showit "38;05" $(printf '%03i' ${n})
  60                 done
  61                 ;;
  62         gr[ae]y)
  63                 check256
  64                 for n in {232..255} ; do
  65                         showit "38;05" ${n}
  66                 done
  67                 ;;
  68         all|256)
  69                 for x in system cube gray ; do
  70                         echo "### SET: ${x}"
  71                         "$0" ${x}
  72                 done
  73                 ;;
  74         ncurses|curses|mutt|nano)
  75                 colors=(
  76                         black
  77                         red
  78                         green
  79                         yellow
  80                         blue
  81                         magenta
  82                         cyan
  83                         white
  84                 )
  85                 norm=$(tput sgr0)
  86                 bold=$(tput bold)
  87                 blackfg=$(tput setaf 0)
  88                 for seta in "af" "ab" ; do
  89                         [[ ${seta} == "af" ]] && ground=fore || ground=back
  90                         for pfx in "" "bright" ; do
  91                                 for (( i = 0; i < ${#colors[@]}; ++i )) ; do
  92                                         [[ ${pfx} == "bright" ]] && printf "${bold}"
  93                                         [[ ${seta} == "ab" ]] && printf "${blackfg}"
  94                                         echo "$(tput set${seta} ${i})this is ${ground}ground color '${pfx}${colors[i]}'${norm}"
  95                                 done
  96                         done
  97                 done
  98                 ;;
  99         *)
 100                 cat <<-EOF
 101                         usage: $0 [--posix] [colors]
 102
 103                         Colors:
 104                          - --env        - show env you can eval in a shell
 105                          - 16, system   - show basic colors (default)
 106                          - cube, 6x6x6  - show most extended colors
 107                          - gray         - show gray scale
 108                          - all, 256     - show all colors
 109                          - curses       - show ncurses color names (used by mutt, nano, etc...)
 110                 EOF
 111                 exit 1
 112                 ;;
 113         esac
 114 }
 115 main "$@"