ncdu-cache

#!/usr/bin/env zsh

# create or use ncdu's output from cache, then open ncdu

set -eu

sanit-path() { echo "$(tr / : <<< "$1" | tr -cd '0-9a-z\-.:')"; }

cache="$HOME/data/cache/ncdu" # RUN mkdir yourself!
dir="$1"; shift
key="$cache/$(sanit-path "$dir")"

mkdir -p "$cache"
(! [ -e "$key" ] || [ -n "${F:-}" ]) && ncdu -o "$key" "$dir" || :

echo ncdu -f "$key" "$@"
ncdu -f "$key" "$@"