update: prepare english chapters

pdf/en-us/Makefile

@@ -1,20 +1,23 @@
 title = 'C++11/14/17 On the Fly'
 filename = 'modern-cpp-tutorial'
 outputname='modern-cpp-tutorial'
+revision = $(shell git describe --always --tags)
 
-all: pdf
+all: revision pdf
+
+revision:
+	@echo '% Autogenerated, do not edit' > revision.tex
+	@echo '\\newcommand{\\revision}{'$(revision)'}' >> revision.tex
 
 pdf: markdown
 	@echo "Compiling PDF file..."
-	@pandoc -s $(filename).md -o $(outputname).pdf \
+	@pandoc -f markdown+smart -s $(filename).md -o $(filename).pdf \
 		--title-prefix $(title) \
 		--listings -H meta/cpp-listings.tex \
 		--template=meta/template.tex \
-		--normalize \
-		--smart \
-		--latex-engine=`which xelatex`
+		--pdf-engine=`which xelatex`
 	@echo "Done."
-	@rm *.md
+	@rm *.md revision.tex
 
 markdown:
 	@echo "Copy markdown files..."
@@ -23,6 +26,6 @@ markdown:
 	@python3 aggregator.py
 
 clean:
-	rm -rf *.md *.pdf
+	rm -rf revision.tex *.md *.pdf
 
 .PHONY: markdown pdf clean