Now __build_sgr_code supports a simple language
This makes it easy in configs to build control codes for colour, etc.
This commit is contained in:
286
bin/__build_sgr_code
Executable file
286
bin/__build_sgr_code
Executable file
@ -0,0 +1,286 @@
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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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#
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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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# TODO: Update the script to allow for `bg:ff00ff` style descriptions, instead
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# of positional.
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debug=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 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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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 (( ${use_3_bit} ))
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then
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basecolor=$(( ${command_color} ))
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next="$(( ${basecolor} + ${legacy_3_bit} ))"
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elif (( ${use_4_bit} ))
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then
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command_color=$(( ${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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exit -1
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elif (( ${1} >= 8 ))
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then
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use_4_bit=1
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intensity_1_bit=1
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legacy_3_bit=$(( ${1} - 8 ))
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else
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use_3_bit=1
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intensity_1_bit=0
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legacy_3_bit=$(( ${1} ))
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fi
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}
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function ext_color()
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{
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use_8_bit=1
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selection=${1:4}
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if (( ${1} > 255 ))
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then
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exit -1
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else
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ext_8_bit=${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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# 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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}
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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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output=""
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if (( ! ${nocsi} ))
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then
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output="["
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fi
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while [[ ! -z $1 ]]
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do
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case $1 in
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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:*) make_color 0 ext_color ${1:4} ;;
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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:*) make_color 0 ext_color ${1:7} ;;
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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:*) make_color 1 ext_color ${1:7} ;;
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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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*) echo "ERROR!" 1>&2 ; exit -1 ;;
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esac
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if [[ ! -z ${output} ]]
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then
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output="${output};"
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fi
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output="${output}${next}"
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shift 1
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done
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if (( ! ${nocsi} ))
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then
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output="${output}m"
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fi
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printf ${output}
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exit 0
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