1 files changed, 184 insertions, 0 deletions
diff --git a/wallpaper/wpPointer.sh b/wallpaper/wpPointer.sh
new file mode 100755
index 0000000..a816f18
--- /dev/null
+++ b/wallpaper/wpPointer.sh
@@ -0,0 +1,184 @@
+#!/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")