fix: pdf builds

pdf/zh-cn/Makefile

@@ -1,20 +1,23 @@
 title = '高速上手 C++11/14/17'
 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 $(filename).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

pdf/zh-cn/meta/template.tex

@@ -152,11 +152,14 @@ $endif$
 \setlength{\parskip}{1ex}
 \setlength{\parskip}{0.5\baselineskip}
 
+\input{revision}
+
+% fix build, see https://github.com/laboon/ebook/issues/139#issuecomment-408696480
+\newcommand{\passthrough}[1]{\lstset{mathescape=false}#1\lstset{mathescape=true}}
 
 \begin{document}
-
 \newcommand{\tightlist}{%
-  \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
+\setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
 
 \thispagestyle{plain}
 \begin{center}
@@ -167,7 +170,7 @@ $endif$
   {\large 欧长坤 (hi@changkun.us)}
   
   \vspace{1ex}
-  最后更新 \today
+  最后更新 \today - \revision
 
   \vspace{1em}
   \textbf{\large 版权声明}

pdf/zh-cn/revision.tex

@@ -0,0 +1,2 @@
+% Autogenerated, do not edit
+\newcommand{\revision}{v1.0.1-91-g6f6531f}