my-site/content/posts/wallpaper-playlist.md

title	date	draft
Wallpaper Playlist for pywal	2019-02-16T11:42:33-05:00	false

{{< highlight sh >}} #!/bin/bash

shuffle_cache="shuffle.txt" regen_flag=0 dir=""

function usage_msg() { # echo "usage: shuffler [-r] [dir_name]" cat <<-EOF Usage: shuffler [-r] [dir_name] -r: regenerate the shuffle cache EOF }

while getopts ":r" opt; do case $opt in r) echo "-r was triggered!" >&2 regen_flag=1 ;; ?) echo "Invalid flag: -$OPTARG" >&2 usage_msg exit 1 ;; esac done

shift $((OPTIND-1))

if no dir, use pwd

if "$#" -eq 0 ; then dir=$(pwd) elif "$#" -gt 1 || ! -d "$1" ; then usage_msg exit 1 else dir="$1" fi

rebuild shuffle cache if regen_flag, doesn't exist or file empty

if "$regen_flag" -eq 1 || ! -f "$dir"/"$shuffle_cache" ||
$(wc -l "$dir"/"$shuffle_cache" ; then find "$dir"/* ! -name "$shuffle_cache" -type f | shuf >
"$dir"/"$shuffle_cache" fi head -n 1 "$dir"/"$shuffle_cache" printf '%s\n\n' "$(sed '1d' "$dir"/"$shuffle_cache")" > "$dir"/"$shuffle_cache" {{< /highlight >}}