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#!/bin/bash
# Sample ~/.cache sizes into a cache file, for widgets/cache.lua.
#
# du walks the tree and costs about 100ms warm, which is fine every 15 minutes
# and unthinkable on a 2-second draw. The old conky config used the same
# interval for the same reason.
set -u
CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/udt"
CACHE="$CACHE_DIR/cachesize.txt"
TARGET="${XDG_CACHE_HOME:-$HOME/.cache}"
mkdir -p "$CACHE_DIR"
TMP="$CACHE.tmp.$$"
trap 'rm -f "$TMP"' EXIT
umask 077
# Total first, then the four largest children. `sort -h` compares human sizes
# numerically; the Lua side converts them again because it needs the ratio to
# the total, not just the order.
{
du -sh "$TARGET" 2>/dev/null
du -sh "$TARGET"/* 2>/dev/null | sort -hr | head -4
} > "$TMP"
if [ ! -s "$TMP" ]; then
echo "cache-sample: du produced nothing" >&2
exit 1
fi
mv -f "$TMP" "$CACHE"
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