This sets me up to do more adaptive colours with the prompt.
Colours now can use 24-bit colour sequences. A script drives the generation of SGR codes... Now I just have to integrate this into `tcshrc.prompt.final`, for dynamic updating.
This commit is contained in:
214
bin/__hex_to_ansi
Executable file
214
bin/__hex_to_ansi
Executable file
@ -0,0 +1,214 @@
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#!/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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debug=0
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if [ ${1} == "fg" ]
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then
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background=0
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elif [ ${1} == "bg" ]
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then
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background=1
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else
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exit -1
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fi
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shift 1
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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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if [ ${1:0:5} == "ansi:" ]
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then
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selection=${1:5}
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if (( ${selection} > 15 ))
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then
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exit -1
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elif (( ${selection} >= 8 ))
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then
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use_4_bit=1
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intensity_1_bit=1
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legacy_3_bit=$(( ${selection} - 8 ))
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else
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use_3_bit=1
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intensity_1_bit=0
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legacy_3_bit=$(( ${selection} ))
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fi
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elif [ ${1:0:4} == "ext:" ]
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then
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use_8_bit=1
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selection=${1:4}
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if (( ${selection} > 255 ))
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then
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exit -1
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else
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ext_8_bit=${selection}
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fi
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else # Parse the hex and do the thing...
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# First split off the red, green, and blue components...
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red_hex=${1:0:2}
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green_hex=${1:2:2}
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blue_hex=${1:4:2}
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# Convert to decimal...
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red_dec=$((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: " $intensity_1_bit
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fi
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# This lets us combine them for a legacy colour value in the legacy colour space...
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legacy_3_bit=$(( ( ${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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# 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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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. Otherwise, we now generate the true-colour
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# result:
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fi
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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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exit -1
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fi
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fi
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command_color=30
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if (( ${use_3_bit} ))
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then
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basecolor=$(( ${command_color} ))
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printf $(( ${basecolor} + ${legacy_3_bit} ))
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elif (( ${use_4_bit} ))
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then
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command_color=$(( ${command_color} + ${intensity_1_bit} * 60 ))
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basecolor=$(( ${command_color} + ${background}*10 ))
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printf $(( ${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} + ${background}*10 ))
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printf "${basecolor};5;${ext_8_bit}"
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else
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basecolor=$(( 8 + ${command_color} + ${background}*10 ))
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printf "${basecolor};2;${red_dec};${green_dec};${blue_dec}"
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fi
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exit 0
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@ -4,6 +4,7 @@
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set csi='['
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# Legacy 3-bit ANSI Forms:
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set ansi_bright='1'
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set ansi_dim='0'
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set ansi_color='m'
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@ -34,6 +35,10 @@ set magenta="$csi$ansi_magenta$ansi_color"
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set cyan="$csi$ansi_cyan$ansi_color"
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set white="$csi$ansi_white$ansi_color"
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# Bright and Dim rely upon the console's setting of colour intensity paired
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# to boldness intensity. For better colour choices, it's better to use
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# extended colours or true colours.
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set dim_black="$csi$ansi_dim;$ansi_black$ansi_color"
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@ -55,6 +60,26 @@ set bright_magenta="$csi$ansi_bright;$ansi_magenta$ansi_color"
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set bright_cyan="$csi$ansi_bright;$ansi_cyan$ansi_color"
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set bright_white="$csi$ansi_bright;$ansi_white$ansi_color"
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# Also somewhat legacy are the extended colours... so I'm not implementing them.
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# Instead, I'll use my script which does math on the 6 char hex string you use in
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# colors...
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#################################
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# Extended 8-bit colour Support #
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#################################
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#######################
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# True colour support #
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#######################
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# The idea behind a true colour variable is that you run: `color_from_hex ff0077` and it expands to
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# a proper colour sequence for a 24-bit color. The shell script which computes these will also attempt to
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# compute a rounded version of your color for use with 8-bit color and a weaker rounded form for use
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# with 3 and 4 bit color.
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# You process true colour by evaluating `__make_color_sequence` on the environment variable.
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alias __make_color_sequence ${CSHENV_DIR}/bin/__hex_to_ansi
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###########################
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# vim:filetype=tcsh
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