generate qrcode externally, needs python qrcode and pillow

wedding-invitation/Makefile

@@ -2,12 +2,16 @@ DOC=thiep1
 INPUT=$(DOC).tex
 TARGET=$(DOC).pdf
 TEX=xelatex
+QR=qr.png
 
 default: $(TARGET)
 
-$(TARGET): $(INPUT) Makefile 
+$(TARGET): $(INPUT) Makefile $(QR)
 	$(TEX) $< && $(TEX) $< 
 
+$(QR): event.txt
+	cat $< | qr > $@
+
 clean:
 	rm -f $(DOC).{pdf,out,aux,log}
 	rm -f *.{pdf,out,aux,log,bbl,blg}