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#!/bin/sh
# wpPointer.sh: Set next or previous wallpaper in wallpaper history or set and add one to it
#
# Usage: wpPointer.sh [-n|p] [-o] FILE...
#
# -n sets next wallpaper if it exists
# -p sets previous wallpaper if it exists
# -o opens recorded wallpapers in sxiv
usageMessage="Usage: ${0} [-n|p] [-o] FILE..."
wpDatFile="$CONFIG_WPLIST"
wpPointerFile="$CONFIG_WPPOINTER"
recordedMax="30"
nextOrPrev=""
next="n"
prev="p"
open=""
error() {
printf '%s error: %s\n' "$0" "$*" >&2
notify-send "${0} error" "$*"
}
errorAndUsage() {
printf '%s error: %s\n%s\n' "$0" "$*" "$usageMessage" >&2
notify-send "${0} error" "${*}\n\n${usageMessage}"
}
getRecordedAmount() {
wc -l "$wpDatFile" | cut -d' ' -f1
}
setWP() {
wp="$1"
feh --bg-max "$wp"
ln -sf "$wp" "${HOME}/wp"
}
setWpByPointer() {
pointer="$1"
wp="$(sed -n "${pointer}p" "$wpDatFile")"
echo "$pointer" >"$wpPointerFile"
if ! setWP "$wp"; then
error "Unable to set ${wp} as wallpaper."
fi
}
setNextOrPrev() {
nextOrPrev="$1"
if ! [ -f "$wpDatFile" ]; then
error "${wpDatFile} does not exist or is not a regular file. Maybe no wallpapers were registered yet."
exit 2
fi
if ! [ -s "$wpDatFile" ]; then
error "${wpDatFile} is empty."
exit 2
fi
datFileLength="$(getRecordedAmount)"
if [ -f "$wpPointerFile" ]; then
pointer="$(cat "$wpPointerFile")"
else
pointer="$datFileLength"
fi
if [ "$nextOrPrev" = "$next" ]; then
if [ "$pointer" -eq "$datFileLength" ]; then
error 'Last recorded wallpaper already selected.'
exit 3
fi
pointer=$((pointer+1))
setWpByPointer "$pointer"
fi
if [ "$nextOrPrev" = "$prev" ]; then
if [ "$pointer" -eq "1" ]; then
error 'First recorded wallpaper already selected.'
exit 3
fi
pointer=$((pointer-1))
setWpByPointer "$pointer"
fi
}
addWp() {
wp="$1"
if ! [ -f "$1" ]; then
error "File ${1} does not exist."
exit 4
fi
if ! setWP "$wp"; then
error "Unable to set ${wp} as wallpaper."
exit 4
fi
wpPath="$(readlink -f "$wp")"
# Double \ for explicit \ to reach variable!
wpPathSanitized="$(echo "$wpPath" | sed 's|/|\\/|g')"
# Delete existing references to the wallpaper to avoid repetition in history
sed -i "/^${wpPathSanitized}$/d" "$wpDatFile"
echo "$wpPath" >>"$wpDatFile"
[ "$(getRecordedAmount)" -gt "$recordedMax" ] && sed -i "1d" "$wpDatFile"
getRecordedAmount >"$wpPointerFile"
}
# Check pointer file makes sense
if [ -f "$wpPointerFile" ]; then
pointer="$(cat "$wpPointerFile")"
pointerAsNumber="$(echo "$pointer" | sed 1q | grep -E '[0-9]+')"
if [ "$pointer" != "$pointerAsNumber" ]; then
rm "$wpPointerFile"
else
if [ "$pointer" -lt 1 ]; then
echo "1" >"$wpPointerFile"
fi
recordedAmount=$(getRecordedAmount)
if [ "$pointer" -gt "$recordedAmount" ]; then
echo "$recordedAmount" >"$wpPointerFile"
fi
fi
fi
# Process options
while getopts ':npo' opt; do
case $opt in
'n' )
if [ -n "$nextOrPrev" ]; then
errorAndUsage 'Tried to use -n and -p at the same time.'
exit 1
fi
setNextOrPrev "$next"
;;
'p' )
if [ -n "$nextOrPrev" ]; then
errorAndUsage 'Tried to use -n and -p at the same time.'
exit 1
fi
setNextOrPrev "$prev"
;;
'o' )
open="y"
;;
'?' )
printf '%s\n' "$usageMessage"
exit 1
esac
done
shift $((OPTIND - 1))
# Set and add arguments to wallpaper history
for wp in "$@"; do
addWp "$wp"
done
[ -n "$open" ] && sxiv -t $(cat "$wpDatFile")
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