73 lines
1.9 KiB
Text
73 lines
1.9 KiB
Text
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#!/usr/bin/env sh
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#
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# Determine if term background is dark or light.
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# Uses a couple different heuristics, most of them
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# from this:
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# https://unix.stackexchange.com/questions/245378/common-environment-variable-to-set-dark-or-light-terminal-background
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# unix exchange.
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#
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# If the background is dark, returns exit code 0 (true).
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# If the background is light, returns exit code 1 (false).
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# TODO implement alternative $COLORBFG method
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is_dark() {
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IFS=/ read -r bg_r bg_g bg_b << EOF
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${1:-"0000/0000/0000"}
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EOF
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IFS=/ read -r fg_r fg_g fg_b << EOF
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${2:-"ffff/ffff/ffff"}
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EOF
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calc=$(echo "($bg_r+$bg_g+$bg_b)-($fg_r+$fg_g+$fg_b)" | tr '[:lower:]' '[:upper:]')
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luminance=$(echo "ibase=16; $calc" | bc)
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if [ "$luminance" -lt 0 ]; then
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true
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else
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false
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fi
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}
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orig_ssty=$(stty -g)
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stty raw -echo min 0 time 0
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printf '\e]11;?\a'
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sleep 0.01
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read -r answer
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bg="${answer#*;}"
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printf '\e]10;?\a'
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sleep 0.01
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read -r answer
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fg="${answer#*;}"
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stty "$orig_ssty"
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bg=$(echo "${bg}" | sed 's/.*\(rgb:[0-9a-f/]*\).*/\1/')
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fg=$(echo "${fg}" | sed 's/.*\(rgb:[0-9a-f/]*\).*/\1/')
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# from the amazing
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# https://stackoverflow.com/questions/2683279/how-to-detect-if-a-script-is-being-sourced
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# answer
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sourced=0
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if [ -n "$ZSH_VERSION" ]; then
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case $ZSH_EVAL_CONTEXT in *:file) sourced=1;; esac
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elif [ -n "$KSH_VERSION" ]; then
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# shellcheck disable=SC2296
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[ "$(cd -- "$(dirname -- "$0")" && pwd -P)/$(basename -- "$0")" != "$(cd -- "$(dirname -- "${.sh.file}")" && pwd -P)/$(basename -- "${.sh.file}")" ] && sourced=1
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elif [ -n "$BASH_VERSION" ]; then
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(return 0 2>/dev/null) && sourced=1
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else
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# Detects `sh` and `dash`; add additional shell filenames as needed.
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case ${0##*/} in sh|-sh|dash|-dash) sourced=1;; esac
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fi
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is_dark "${bg#rgb:}" "${fg#rgb:}"
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outp="$?"
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if [ "$sourced" -eq 1 ]; then
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if [ "$outp" -eq 0 ]; then
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export TERM_DARK=true
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else
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export TERM_DARK=false
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fi
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else
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exit "$outp"
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fi
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