Doc/Makefile: add ps and pdf generation

It can be handful to check how a man page looks in PDF or Postscript.
Use 'make ps' and 'make pdf' to generate one.
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Documentation/.gitignore

 *.xml
 *.html
 *.[1-8]
+*.pdf
+*.ps

Documentation/Makefile

@@ -9,16 +9,34 @@ XMLS		:= $(patsubst %.txt,%.xml,$(SRC))
 MANS		:= $(patsubst %.txt,%.8,$(SRC))
 MAN8DIR		:= $(MANDIR)/man8
 
+GROFF=groff
+PAPER=$(shell paperconf 2>/dev/null || echo letter)
+GROFF_OPTS	:= -Tps -t -dpaper=$(PAPER) -P-p$(PAPER) \
+		   -man -msafer -rC1 -rD1 -rS11
+PSS		:= $(MANS:%.8=%.ps)
+PDFS		:= $(MANS:%.8=%.pdf)
+
 all: $(MANS)
+ps: $(PSS)
+pdf: $(PDFS)
+.PHONY: all ps pdf
 
 %.8: %.txt
 	$(E) "  GEN     " $@
 	$(Q) $(ASCIIDOC) -b docbook -d manpage -o $(patsubst %.8,%.xml,$@) $<
 	$(Q) $(XMLTO) man --skip-validation $(patsubst %.8,%.xml,$@) 2>/dev/null
 
+%.ps: %.8
+	$(E) "  GEN     " $@
+	$(Q) $(GROFF) $(GROFF_OPTS) $^ > $@
+
+%.pdf: %.ps
+	$(E) "  GEN     " $@
+	$(Q) ps2pdf $< $@
+
 clean:
 	$(E) "  CLEAN   "
-	$(Q) rm -f $(XMLS) $(MANS)
+	$(Q) rm -f $(XMLS) $(MANS) $(PSS) $(PDFS)
 
 install: $(MANS)
 	$(E) "  INSTALL " $(MANS)