512 lines
14 KiB
Bash
Executable File
512 lines
14 KiB
Bash
Executable File
#!/usr/bin/env bash
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# This script will take an HTML compatible hex colour string and turn it into
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# a terminal sequence for true colour and other formats which best approximate
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# its colour value.
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#
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# After that, we can map a few other special named symbols. The idea is to
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# permit shell variables such as `aaffcc bold italic` to indicate what you
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# want a format to look like.
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#
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# The terminal colour and effect language herein implemented is named
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# "SGR Name".
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debug=0
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# This is the named color map. Just add new entries and they'll be supported...
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declare -A map
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map[white]="FFFFFF"
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map[silver]="C0C0C0"
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map[gray]="808080"
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map[grey]="808080"
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map[black]="000000"
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map[red]="FF0000"
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map[maroon]="800000"
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map[yellow]="FFFF00"
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map[olive]="808000"
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map[lime]="00FF00"
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map[green]="008000"
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map[aqua]="00FFFF"
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map[teal]="008080"
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map[blue]="0000FF"
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map[navy]="000080"
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map[fuchsia]="FF00FF"
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map[purple]="800080"
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# Some VGA color names can be promoted:
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map[brown]="aa5500"
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map[cyan]="00aaaa"
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# The VGA names can be prefixed with "vga-" to explicitly avoid the collisions with HTML names, above...
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# Based upon wikipedia's article on ANSI. See the table on that page for details.
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map[vga-black]="000000"
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map[vga-red]="aa0000"
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map[vga-green]="00aa00"
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map[vga-brown]="aa5500"
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map[vga-yellow]="aa5500"
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map[vga-blue]="0000aa"
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map[vga-magenta]="aa00aa"
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map[vga-cyan]="00aaaa"
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map[vga-white]="aaaaaa"
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map[vga-brightblack]="555555"
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map[vga-grey]="555555"
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map[vga-gray]="555555"
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map[vga-brightred]="ff5555"
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map[vga-brightgreen]="55ff55"
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map[vga-brightyellow]="ffff55"
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map[vga-brightblue]="5555ff"
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map[vga-brightmagenta]="ff55ff"
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map[vga-brightcyan]="55ffff"
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map[vga-brightwhite]="ffffff"
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enable_greyscale_cheat=0
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nocsi=0
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if [[ $1 == "no-csi" ]]
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then
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nocsi=1
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shift 1
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fi
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function dump_color()
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{
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text_color=$1
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shift 1
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name=$1
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shift 1
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ext_name=$1
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shift 1
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do_reverse="reverse"
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do_reverse=""
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printf "%-24s%-7s |" ${name} ${ext_name}
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printf "`$0 reset ${do_reverse} bg:${text_color} fg:${name}`native-sample`$0 reset`|"
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if [[ ! -v CSHENV_TERMINAL_COLORS ]] || (( ${CSHENV_TERMINAL_COLORS} >= 256 ))
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then
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printf "`env CSHENV_TERMINAL_COLORS=256 $0 reset ${do_reverse} bg:${text_color} fg:${name}`8-bit sample`$0 reset`|"
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fi
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if [[ ! -v CSHENV_TERMINAL_COLORS ]] || (( ${CSHENV_TERMINAL_COLORS} >= 16 ))
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then
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printf "`env CSHENV_TERMINAL_COLORS=16 $0 reset ${do_reverse} bg:${text_color} fg:${name}`4-bit sample`$0 reset`|"
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fi
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if [[ ! -v CSHENV_TERMINAL_COLORS ]] || (( ${CSHENV_TERMINAL_COLORS} >= 8 ))
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then
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printf "`env CSHENV_TERMINAL_COLORS=8 $0 reset ${do_reverse} bg:${text_color} fg:${name}`3-bit sample`$0 reset`|"
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fi
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printf "\n"
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}
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function dump_colors()
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{
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for key in ${!map[@]}
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do
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case $key in
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*bright*) text_color="000000" ;;
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*black*) text_color="ffffff" ;;
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*) text_color="000000" ;;
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esac
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dump_color ${text_color} ${key} ${map[${key}]}
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done
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val=0
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while (( ${val} < 16 ))
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do
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#text_color="cccccc"
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text_color="000000"
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dump_color ${text_color} ansi:${val} ansi:${val}
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val=$(( ${val} + 1 ))
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done
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exit 0
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}
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function xdump_colors()
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{
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for key in ${!map[@]}
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do
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case $key in
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*bright*) text_color="000000" ;;
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*black*) text_color="ffffff" ;;
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*) text_color="000000" ;;
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esac
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printf "%-24s${map[${key}]} |" ${key}
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printf "`$0 reset reverse bg:${text_color} fg:${key}`native-sample`$0 reset`|"
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if [[ ! -v CSHENV_TERMINAL_COLORS ]] || (( ${CSHENV_TERMINAL_COLORS} >= 256 ))
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then
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printf "`env CSHENV_TERMINAL_COLORS=256 $0 reset reverse bg:${text_color} fg:${key}`8-bit sample`$0 reset`|"
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fi
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if [[ ! -v CSHENV_TERMINAL_COLORS ]] || (( ${CSHENV_TERMINAL_COLORS} >= 16 ))
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then
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printf "`env CSHENV_TERMINAL_COLORS=16 $0 reset reverse bg:${text_color} fg:${key}`4-bit sample`$0 reset`|"
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fi
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if [[ ! -v CSHENV_TERMINAL_COLORS ]] || (( ${CSHENV_TERMINAL_COLORS} >= 8 ))
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then
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printf "`env CSHENV_TERMINAL_COLORS=8 $0 reset reverse bg:${text_color} fg:${key}`3-bit sample`$0 reset`|"
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fi
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printf "\n"
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done
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exit 0
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}
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function setup_color_depth()
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{
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use_8_bit=0
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use_4_bit=0
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use_3_bit=0
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# Must only be set if terminal colors are reduced...
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if [[ -v CSHENV_TERMINAL_COLORS ]]
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then
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if (( ${CSHENV_TERMINAL_COLORS} == 256 ))
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then
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use_8_bit=1
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elif (( ${CSHENV_TERMINAL_COLORS} == 16 ))
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then
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use_4_bit=1
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elif (( ${CSHENV_TERMINAL_COLORS} == 8 ))
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then
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use_3_bit=1
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else
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echo "ERROR!" 1>&2 ; exit -1
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fi
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fi
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}
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function render_color()
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{
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command_color=30
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if (( ${use_3_bit} ))
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then
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# Underline colours need 8-bit or more
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if (( ${background} > 1 )) ; then return; fi
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basecolor=$(( ${command_color} + ${background}*10))
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next="$(( ${basecolor} + ${legacy_3_bit} ))"
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elif (( ${use_4_bit} ))
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then
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# Underline colours need 8-bit or more
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if (( ${background} > 1 )) ; then return; fi
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command_color=$(( ${command_color} + ${intensity_1_bit} * 60 ))
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basecolor=$(( ${command_color} + ${background}*10 ))
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next="$(( ${basecolor} + ${legacy_3_bit} ))"
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elif (( ${use_8_bit} ))
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then
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basecolor=$(( 8 + ${command_color} + ${background}*10 ))
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next="${basecolor};5;${ext_8_bit}"
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else
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basecolor=$(( 8 + ${command_color} + ${background}*10 ))
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next="${basecolor};2;${red_dec};${green_dec};${blue_dec}"
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fi
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}
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function ansi_color()
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{
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if (( ${1} > 15 ))
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then
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echo "ERROR!" 1>&2 ; exit -1
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elif (( ${1} >= 8 ))
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then
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use_4_bit=1
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intensity_1_bit=1
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legacy_3_bit=$(( ${1} - 8 ))
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else
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use_3_bit=1
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intensity_1_bit=0
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legacy_3_bit=$(( ${1} ))
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fi
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}
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function ext_grey()
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{
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use_8_bit=1
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grey_val=${1}
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if (( ${grey_val} < 0 || ${grey_val} > 23 ))
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then
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echo "ERROR!" 1>&2 ; exit -1
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fi
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ext_8_bit=$(( 232 + ${grey_val} ))
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}
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function ext_rgb()
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{
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use_8_bit=1
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red_ext_val=$((6#${1:0:1}))
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green_ext_val=$((6#${1:1:1}))
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blue_ext_val=$((6#${1:2:1}))
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ext_8_bit=$(( 16 + 36 * ${red_ext_val} + 6 * ${green_ext_val} + ${blue_ext_val} ))
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}
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function ext_color()
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{
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use_8_bit=1
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if (( ${1} > 255 ))
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then
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echo "ERROR!" 1>&2 ; exit -1
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else
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ext_8_bit=${1}
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fi
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}
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function rgb_color()
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{
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color=$1
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case $1 in
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[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]) color=${1:0:1}${1:0:1}${1:1:1}${1:1:1}${1:2:1}${1:2:1} ;;
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esac
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# First split off the red, green, and blue components...
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red_hex=${color:0:2}
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green_hex=${color:2:2}
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blue_hex=${color:4:2}
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# Convert to decimal...
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red_dec=$((16#${red_hex}))
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green_dec=$((16#${green_hex}))
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blue_dec=$((16#${blue_hex}))
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if (( ${debug} != 0 ))
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then
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echo "Red: $red_dec"
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echo "Green: $green_dec"
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echo "Blue: $blue_dec"
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fi
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# Now compute the rest of the stuff...
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# We probably don't have to compute all the unused color states. We only have to compute
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# the color state we're signed up for by CSHENV_TERMINAL_COLORS... but whatever...
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# We round up by 128 points of colour, so that if we're above a certain intensity, we get the top
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# bit set.
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red_1_bit=$(( ( ( ${red_dec} + 128 ) >> 8 ) & 1 ))
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green_1_bit=$(( ( ( ${green_dec} + 128 ) >> 8 ) & 1 ))
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blue_1_bit=$(( ( ( ${blue_dec} + 128 ) >> 8 ) & 1 ))
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intensity_1_bit=0
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# If we can support an intensity bit, we'll turn that on too...
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# But we're going to stop using bold to set the colour "intense"
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# We'll use the 9x and 10x forms...
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if (( ${red_dec} >= 192 || ${green_dec} >= 192 || ${blue_dec} >= 192 ))
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then
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intensity_1_bit=1
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fi
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if (( ${debug} != 0 ))
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then
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echo "Red bit: " $red_1_bit
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echo "Green bit: " $green_1_bit
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echo "Blue bit: " $blue_1_bit
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echo "Intensity bit: " $intensity_1_bit
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fi
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# Because grey is tricky, I'm going to special case it:
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if (( 1 && ${red_dec} == ${green_dec} && ${green_dec} == ${blue_dec} && ${red_dec} < 128 && ${red_dec} >= 80 ))
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then
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red_1_bit=0
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green_1_bit=0
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blue_1_bit=0
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intensity_1_bit=1
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fi
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# Because brown is tricky, I'm going to special case it:
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if (( ${red_dec} > 128 && ${green_dec} > 80 && ${blue_dec} < 50 ))
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then
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red_1_bit=1
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green_1_bit=1
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blue_1_bit=0
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fi
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if (( ${debug} != 0 ))
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then
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echo "Red bit: " $red_1_bit
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echo "Green bit: " $green_1_bit
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echo "Blue bit: " $blue_1_bit
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echo "Intensity bit: " $intensity_1_bit
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fi
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# This lets us combine them for a legacy colour value in the legacy colour space...
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legacy_3_bit=$(( ( ${blue_1_bit} << 2 ) + ( ${green_1_bit} << 1 ) + ( ${red_1_bit} ) ))
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if (( ${debug} != 0 ))
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then
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echo "Legacy colour: " ${legacy_3_bit} " Intensity: " ${intensity_1_bit}
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fi
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# Now compute an extended colour cube placement (216 colours):
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red_ext_val=$(( ${red_dec} * 6 / 256 ))
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green_ext_val=$(( ${green_dec} * 6 / 256 ))
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blue_ext_val=$(( ${blue_dec} * 6 / 256 ))
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if (( ${debug} != 0 ))
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then
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echo "Red ext: " ${red_ext_val}
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echo "Green ext: " ${green_ext_val}
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echo "Blue ext: " ${blue_ext_val}
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fi
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ext_8_bit=$(( 16 + 36 * ${red_ext_val} + 6 * ${green_ext_val} + ${blue_ext_val} ))
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if (( ${debug} ))
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then
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echo "Computed 216 color cube: " ${ext_8_bit}
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fi
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# Check for precise greyscale, which would replace the above:
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# (Note that precise greyscale is implied by a user explicitly making ALL of RGB the
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# same value, thus demanding greyscale, rather than a subtle tinting...)
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if (( ${red_dec} == ${green_dec} && ${green_dec} == ${blue_dec} ))
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then
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ext_8_bit=$(( 232 + ${red_dec} * 24 / 256 ))
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fi
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if (( ${debug} ))
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then
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echo "Computed 256 color choice, after applying greyscale scan: " ${ext_8_bit}
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fi
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if (( ${enable_greyscale_cheat} ))
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then
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# Check for SPECIFIC white and black and grey:
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# The half-saturation, no saturation, and full saturation values are mapped
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# to specific points in the legacy set. (This may be ill-advised as a manually
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# built reverse video terminal setting through colour mapping may make it so that
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# we wind up in la-la land. Perhaps the better way is to find the head and tail
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# points in the 6x6x6 colour cube.)
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#
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# TODO: Only map the head and tail of the colour cube.
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if (( ${red_dec} == ${green_dec} && ${green_dec} == ${blue_dec} ))
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then
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if (( ${red_dec} == 0 ))
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then
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ext_8_bit=0
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elif (( ${red_dec} == 255 ))
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then
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ext_8_bit=15
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elif (( ${red_dec} == 128 ))
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then
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ext_8_bit=8
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elif (( ${red_dec} == 192 ))
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then
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ext_8_bit=7
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fi
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fi
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fi
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if (( ${debug} ))
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then
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echo "Computed 256 color choice, after applying white and black scan: " ${ext_8_bit}
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fi
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# We do NOT check for the base colours precisely. Since those 16 can be custom mapped by your terminal emulator, you just pass `ansi:0` thru
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# `ansi:15` to select them by ID. Or use `ext:0` thru `ext:255` to select a specific extended colour.
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}
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function make_color()
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{
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setup_color_depth
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background=$1 # $1 is the background bit
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$2 $3 # $2 is the color function
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render_color
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}
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function named_color()
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{
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name=${1,,}
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if [[ ! -v map[$name] ]]
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then
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echo "ERROR!" 1>&2 ; exit -1
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fi
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mapped=${map[$name]}
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rgb_color ${mapped}
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}
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function build_sgr_code()
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{
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case $1 in
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dump-colors) dump_colors ;;
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reset) next=0 ;;
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bold) next=1 ;;
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dim) next=2 ;;
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italic) next=3 ;;
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underline|under) next=4 ;;
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blink) next=5 ;;
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fastblink) next=6 ;;
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reverse) next=7 ;;
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hide|conceal) next=8 ;;
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strike|strikethrough|strikethru) next=9 ;;
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doubleunder) next=21 ;;
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reveal) next=28 ;;
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ansi:*) make_color 0 ansi_color ${1:5} ;;
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ext:grey*) make_color 0 ext_grey ${1:8} ;;
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ext:rgb*) make_color 0 ext_rgb ${1:7} ;;
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ext:*) make_color 0 ext_color ${1:4} ;;
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# 12-bit color also supported
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[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]) make_color 0 rgb_color $1 ;;
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[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]) make_color 0 rgb_color $1 ;;
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fg:ansi:*) make_color 0 ansi_color ${1:8} ;;
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fg:ext:grey*) make_color 0 ext_grey ${1:11} ;;
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fg:ext:rgb*) make_color 0 ext_rgb ${1:10} ;;
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fg:ext:*) make_color 0 ext_color ${1:7} ;;
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# 12-bit color also supported
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fg:[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]) make_color 0 rgb_color ${1:3} ;;
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fg:[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]) make_color 0 rgb_color ${1:3} ;;
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bg:ansi:*) make_color 1 ansi_color ${1:8} ;;
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bg:ext:grey*) make_color 1 ext_grey ${1:11} ;;
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bg:ext:rgb*) make_color 1 ext_rgb ${1:10} ;;
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bg:ext:*) make_color 1 ext_color ${1:7} ;;
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# 12-bit color also supported
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bg:[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]) make_color 1 rgb_color ${1:3} ;;
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bg:[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]) make_color 1 rgb_color ${1:3} ;;
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ul:ext:*) make_color 2 ext_color ${1:7} ;;
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# 12-bit color also supported
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ul:[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]) make_color 2 rgb_color ${1:3} ;;
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ul:[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]) make_color 2 rgb_color ${1:3} ;;
|
|
|
|
fg:*) make_color 0 named_color ${1:3} ;;
|
|
bg:*) make_color 1 named_color ${1:3} ;;
|
|
ul:*) make_color 2 named_color ${1:3} ;;
|
|
*) make_color 0 named_color $1 ;;
|
|
esac
|
|
if [[ ! -z ${output} ]]
|
|
then
|
|
output="${output};"
|
|
fi
|
|
output="${output}${next}"
|
|
}
|
|
|
|
output=""
|
|
while [[ ! -z $1 ]]
|
|
do
|
|
build_sgr_code $1
|
|
shift 1
|
|
done
|
|
|
|
if [[ ! -z ${output} ]] && (( ! ${nocsi} ))
|
|
then
|
|
output="[${output}m"
|
|
fi
|
|
if [[ ! -z ${output} ]]
|
|
then
|
|
printf ${output}
|
|
fi
|
|
|
|
|
|
exit 0
|