doc: Make asciidoc extra optional.

Completely separate man page generation from the main build to satisfy
travis-ci behaviour.

Signed-off-by: Loui Chang <louipc.ist@gmail.com>

README.md

@@ -24,7 +24,8 @@ Toxic is a [Tox](https://tox.im)-based instant messenging client which formerly
 
 ##### Documentation
 * [Asciidoc](http://asciidoc.org/index.html) Only required for regenerating manpages.
-* Run `make doc` in the build directory after editing the asciidoc to regenerate the manpages.
+* Run `make` in the doc directory after editing the asciidoc to regenerate the manpages.
+* Asciidoc files and generated manpages will need to be commited together.
 
 ### Compiling
 1. `cd build/`

build/Makefile

@@ -69,12 +69,6 @@ toxic: $(OBJ)
 
 doc: $(MANFILES:%=$(DOC_DIR)/%)
 
-$(DOC_DIR)/%: $(DOC_DIR)/%.asc
-	@echo "  Generating man page $(@F)"
-	@a2x -f manpage -a revdate=$(shell git log -1 --date=short --format="%ad" $<) \
-	-a manmanual="toxic manual" -a mansource=toxic \
-	-a manversion=__VERSION__ -a datadir=__DATADIR__ $<
-
 clean:
 	rm -rf *.d *.o toxic
 	rm -rf $(MANFILES)

doc/Makefile

@@ -0,0 +1,12 @@
+MANFILES = toxic.1 toxic.conf.5
+
+# Targets
+doc: $(MANFILES)
+
+%: %.asc
+	@echo "  Generating man page $(@F)"
+	@a2x -f manpage -a revdate=$(shell git log -1 --date=short --format="%ad" $<) \
+	-a manmanual="toxic manual" -a mansource=toxic \
+	-a manversion=__VERSION__ -a datadir=__DATADIR__ $<
+
+.PHONY: doc