[PATCH 04/11] doc: use asciidoctor to build man pages directly

[Felipe Contreras <felipe.contreras@gmail.com>]

There's no need to use xmlto to build the man pages when modern
asciidoctor can do it by itself.

This new mode will be active only when USE_ASCIIDOCTOR is set.

Suggested-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
---
 Documentation/Makefile | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 981e322f18..ce9cea0817 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -198,6 +198,7 @@ ASCIIDOC_DEPS = asciidoctor-extensions.rb GIT-ASCIIDOCFLAGS
 DBLATEX_COMMON =
 XMLTO_EXTRA += --skip-validation
 XMLTO_EXTRA += -x manpage.xsl
+TXT_TO_MAN = $(ASCIIDOC_COMMON) -b manpage
 endif
 
 SHELL_PATH ?= $(SHELL)
@@ -362,8 +363,13 @@ $(OBSOLETE_HTML): %.html : %.txto $(ASCIIDOC_DEPS)
 manpage-base-url.xsl: manpage-base-url.xsl.in
 	$(QUIET_GEN)sed "s|@@MAN_BASE_URL@@|$(MAN_BASE_URL)|" $< > $@
 
+ifdef TXT_TO_MAN
+%.1 %.5 %.7 : %.txt $(ASCIIDOC_DEPS)
+	$(QUIET_ASCIIDOC)$(TXT_TO_MAN) -o $@ $<
+else
 %.1 %.5 %.7 : %.xml manpage-base-url.xsl $(wildcard manpage*.xsl)
 	$(QUIET_XMLTO)$(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
+endif
 
 %.xml : %.txt $(ASCIIDOC_DEPS)
 	$(QUIET_ASCIIDOC)$(TXT_TO_XML) -d manpage -o $@ $<
-- 
2.31.1