Add background XML file

.gitignore

@@ -1 +1,2 @@
+build
 scaled

Makefile

@@ -1,31 +1,50 @@
 ORIGINAL=$(wildcard original/*.jpg)
-SCALED=$(patsubst original/%.jpg, scaled/%.jpg, $(ORIGINAL))
+SCALED=$(sort $(patsubst original/%.jpg, scaled/%.jpg, $(ORIGINAL)))
 
 prefix ?= /usr
 datarootdir = $(prefix)/share
 datadir = $(datarootdir)
 
 .PHONY: all clean install uninstall
 
-all: $(SCALED)
+all: $(SCALED) scaled/info.xml
 
 clean:
-	rm -rf scaled
+	rm -rf build scaled
 
 install: all
 	for file in $(SCALED); do \
-		install -D -m 0644 "$$file" "$(DESTDIR)$(datadir)/backgrounds/$$(basename "$$file")"; \
+		install -D -m 0644 "$$file" "$(DESTDIR)$(datadir)/backgrounds/pop/$$(basename "$$file")"; \
 	done
+	install -D -m 0644 "scaled/info.xml" "$(DESTDIR)$(datadir)/gnome-background-properties/pop-wallpapers.xml"
 
 uninstall:
 	for file in $(SCALED); do \
-		rm -f "$(DESTDIR)$(datadir)/backgrounds/$$(basename "$$file")"; \
+		rm -f "$(DESTDIR)$(datadir)/backgrounds/pop/$$(basename "$$file")"; \
 	done
-	rmdir --ignore-fail-on-non-empty "$(DESTDIR)$(datadir)/backgrounds/"
-
-scaled:
-	mkdir -p scaled
-	touch scaled
-
-scaled/%.jpg: original/%.jpg scaled
-	convert "$<" -resize "3840x2160^" "$@"
+	rmdir --ignore-fail-on-non-empty "$(DESTDIR)$(datadir)/backgrounds/pop/"
+	rm -f "$(DESTDIR)$(datadir)/gnome-background-properties/pop-wallpapers.xml"
+	rmdir --ignore-fail-on-non-empty "$(DESTDIR)$(datadir)/gnome-background-properties/"
+
+scaled/%.jpg: original/%.jpg
+	@mkdir -p build scaled
+	convert "$<" -resize "3840x2160^" "build/$*.jpg"
+	mv "build/$*.jpg" "$@"
+
+scaled/info.xml: $(SCALED)
+	@mkdir -p build scaled
+	echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" > "build/info.xml"
+	echo "<!DOCTYPE wallpapers SYSTEM \"gnome-wp-list.dtd\">" >> "build/info.xml"
+	echo "<wallpapers>" >> "build/info.xml"
+	for file in $(SCALED); do \
+		echo "    <wallpaper>" >> "build/info.xml"; \
+		echo "        <name>$$(basename "$$file" .jpg)</name>" >> "build/info.xml"; \
+		echo "        <filename>/usr/share/backgrounds/pop/$$(basename "$$file")</filename>" >> "build/info.xml"; \
+		echo "        <options>zoom</options>" >> "build/info.xml"; \
+		echo "        <pcolor>#000000</pcolor>" >> "build/info.xml"; \
+		echo "        <scolor>#000000</scolor>" >> "build/info.xml"; \
+		echo "        <shade_type>solid</shade_type>" >> "build/info.xml"; \
+		echo "    </wallpaper>" >> "build/info.xml"; \
+	done
+	echo "</wallpapers>" >> "build/info.xml"
+	mv "build/info.xml" "$@"