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#!/bin/sh
. ./ansi.sh
. ./colors.sh
# this uses the webaim.org contrast checker api to check all colors against
# background.
# depends on jo, jq, and xh
[ $# -lt 0 ] || set -- \
red green yellow blue magenta cyan white \
brred brgreen bryellow brblue brmagenta brcyan brwhite
# lower: error if below this
lower=4.5
# higher: warn if below this
higher=7
# reset after printing
reprint() {
printf '%s%s' "$@" "$(reset)"
}
prefix() {
reprint "$(acol $1)$2"
}
demo() {
reprint "$(fgc $color)$(bgc $background)demo text"
}
# $1 should be "fail" or "warn"
fmt() {
case "$1" in
fail) printf '"%s: #%s at \(.ratio)\t%s (%s)\n"' \
"$(prefix 31 fail)" "$color" "$(demo)" "$colnm";;
warn) printf '"%s: #%s at \(.ratio)\t%s (%s)\n"' \
"$(prefix 33 warn)" "$color" "$(demo)" "$colnm";;
*) printf '""' ;;
esac
}
# reads stdin (json) and prints information about color if it fails
check() {
jq -j "
if (.ratio | tonumber) < $lower then $(fmt fail)
elif (.ratio | tonumber) < $higher then $(fmt warn)
else $(fmt none)
end"
}
for i; do
color=$(eval echo '$'$i)
colnm=$i
xh https://webaim.org/resources/contrastchecker/ api== \
bcolor==$background fcolor==$color | \
jo -f- color=$color | check
done
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