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random_seed_is_set() {
[ -n "$RANDOM_SEED" ]
}
deterministic_index() {
local -r namespace="$1"; shift
local -r count="$1"; shift
local checksum
checksum=$(printf '%s' "${RANDOM_SEED}:$namespace" | cksum)
checksum=${checksum%% *}
printf '%s\n' $(( checksum % count ))
}
random_index() {
local -r namespace="$1"; shift
local -r count="$1"; shift
if random_seed_is_set; then
deterministic_index "$namespace" "$count"
else
printf '%s\n' $(( RANDOM % count ))
fi
}
random_animation_css_class() {
local -r speed="$1"; shift
local -r context="${1:-$speed}"
local -i index
local -a classes=(
"animate-opacity-$speed"
"animate-top-$speed"
"animate-left-$speed"
"animate-right-$speed"
"animate-bottom-$speed"
"animate-zoom-$speed"
"animate-snap-rotate-$speed"
"animate-hard-zoom-$speed"
"animate-slam-left-$speed"
"animate-slam-right-$speed"
"animate-flash-in-$speed"
"animate-invert-pop-$speed"
"animate-posterize-pop-$speed"
"animate-skew-snap-$speed"
"animate-glitch-step-$speed"
)
index=$(random_index "animation:$speed:$context" "${#classes[@]}")
printf '%s\n' "${classes[index]}"
}
deterministic_shuffle() {
local checksum
local line
while IFS= read -r line; do
checksum=$(printf '%s' "${RANDOM_SEED}:shuffle:$line" | cksum)
checksum=${checksum%% *}
printf '%010u\t%s\n' "$checksum" "$line"
done | sort -n -k1,1 -k2,2 | cut -f2-
}
maybe_shuffle() {
if [ "$SHUFFLE" = yes ]; then
if random_seed_is_set; then
deterministic_shuffle
else
# $SORT (compat.source.sh): -R (random shuffle) is GNU-only.
"$SORT" -R
fi
else
# Plain sort here is POSIX-portable; no GNU-only flag involved.
sort
fi
}
|
