[PATCH] perf: Documentation: Support for asciidoctor

[Takashi Iwai <tiwai@suse.de>]

asciidoc seems behind the recent big wave of python3 conversion, and
we were advised to switch to asciidoctor instead.  It's almost
compatible but some extensions used for perf documentation don't work
with it.  Here is the patch to cover them, and add the proper support
for asciidoctor.

Pass USE_ASCIIDOCTOR=yes to make for using asciidoctor instead of
asciidoc.  The man source and manual attributes are passed via command
options.  The support for these attributes have been fixed in the
latest asciidoctor code.

Since asciidoctor can covert to a man page and an HTML directly, we
can omit the dependency on xmlto when USE_ASCIIDOCTOR is set.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 tools/perf/Documentation/Makefile                  | 29 ++++++++++++++++++----
 tools/perf/Documentation/asciidoctor-extensions.rb | 29 ++++++++++++++++++++++
 2 files changed, 53 insertions(+), 5 deletions(-)
 create mode 100644 tools/perf/Documentation/asciidoctor-extensions.rb

diff --git a/tools/perf/Documentation/Makefile b/tools/perf/Documentation/Makefile
index db11478e30b4..42261a9b280e 100644
--- a/tools/perf/Documentation/Makefile
+++ b/tools/perf/Documentation/Makefile
@@ -47,7 +47,8 @@ man5dir=$(mandir)/man5
 man7dir=$(mandir)/man7
 
 ASCIIDOC=asciidoc
-ASCIIDOC_EXTRA = --unsafe
+ASCIIDOC_EXTRA = --unsafe -f asciidoc.conf
+ASCIIDOC_HTML = xhtml11
 MANPAGE_XSL = manpage-normal.xsl
 XMLTO_EXTRA =
 INSTALL?=install
@@ -55,6 +56,14 @@ RM ?= rm -f
 DOC_REF = origin/man
 HTML_REF = origin/html
 
+ifdef USE_ASCIIDOCTOR
+ASCIIDOC = asciidoctor
+ASCIIDOC_EXTRA = -a compat-mode
+ASCIIDOC_EXTRA += -I. -rasciidoctor-extensions
+ASCIIDOC_EXTRA += -a mansource="perf" -a manmanual="perf Manual"
+ASCIIDOC_HTML = xhtml5
+endif
+
 infodir?=$(prefix)/share/info
 MAKEINFO=makeinfo
 INSTALL_INFO=install-info
@@ -73,10 +82,12 @@ ifeq ($(_tmp_tool_path),)
 	missing_tools = $(ASCIIDOC)
 endif
 
+ifndef USE_ASCIIDOCTOR
 _tmp_tool_path := $(call get-executable,$(XMLTO))
 ifeq ($(_tmp_tool_path),)
 	missing_tools += $(XMLTO)
 endif
+endif
 
 #
 # For asciidoc ...
@@ -264,9 +275,17 @@ clean:
 
 $(MAN_HTML): $(OUTPUT)%.html : %.txt
 	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
-	$(ASCIIDOC) -b xhtml11 -d manpage -f asciidoc.conf \
+	$(ASCIIDOC) -b $(ASCIIDOC_HTML) -d manpage \
+		$(ASCIIDOC_EXTRA) -aperf_version=$(PERF_VERSION) -o $@+ $< && \
+	mv $@+ $@
+
+ifdef USE_ASCIIDOCTOR
+$(OUTPUT)%.1 $(OUTPUT)%.5 $(OUTPUT)%.7 : $(OUTPUT)%.txt
+	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
+	$(ASCIIDOC) -b manpage -d manpage \
 		$(ASCIIDOC_EXTRA) -aperf_version=$(PERF_VERSION) -o $@+ $< && \
 	mv $@+ $@
+endif
 
 $(OUTPUT)%.1 $(OUTPUT)%.5 $(OUTPUT)%.7 : $(OUTPUT)%.xml
 	$(QUIET_XMLTO)$(RM) $@ && \
@@ -274,7 +293,7 @@ $(OUTPUT)%.1 $(OUTPUT)%.5 $(OUTPUT)%.7 : $(OUTPUT)%.xml
 
 $(OUTPUT)%.xml : %.txt
 	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
-	$(ASCIIDOC) -b docbook -d manpage -f asciidoc.conf \
+	$(ASCIIDOC) -b docbook -d manpage \
 		$(ASCIIDOC_EXTRA) -aperf_version=$(PERF_VERSION) -o $@+ $< && \
 	mv $@+ $@
 
@@ -321,13 +340,13 @@ howto-index.txt: howto-index.sh $(wildcard howto/*.txt)
 	mv $@+ $@
 
 $(patsubst %,%.html,$(ARTICLES)) : %.html : %.txt
-	$(QUIET_ASCIIDOC)$(ASCIIDOC) -b xhtml11 $*.txt
+	$(QUIET_ASCIIDOC)$(ASCIIDOC) -b $(ASCIIDOC_HTML) $*.txt
 
 WEBDOC_DEST = /pub/software/tools/perf/docs
 
 $(patsubst %.txt,%.html,$(wildcard howto/*.txt)): %.html : %.txt
 	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
-	sed -e '1,/^$$/d' $< | $(ASCIIDOC) -b xhtml11 - >$@+ && \
+	sed -e '1,/^$$/d' $< | $(ASCIIDOC) -b $(ASCIIDOC_HTML) - >$@+ && \
 	mv $@+ $@
 
 # UNIMPLEMENTED
diff --git a/tools/perf/Documentation/asciidoctor-extensions.rb b/tools/perf/Documentation/asciidoctor-extensions.rb
new file mode 100644
index 000000000000..d148fe95c0c4
--- /dev/null
+++ b/tools/perf/Documentation/asciidoctor-extensions.rb
@@ -0,0 +1,29 @@
+require 'asciidoctor'
+require 'asciidoctor/extensions'
+
+module Perf
+  module Documentation
+    class LinkPerfProcessor < Asciidoctor::Extensions::InlineMacroProcessor
+      use_dsl
+
+      named :chrome
+
+      def process(parent, target, attrs)
+        if parent.document.basebackend? 'html'
+          %(<a href="#{target}.html">#{target}(#{attrs[1]})</a>\n)
+        elsif parent.document.basebackend? 'manpage'
+          "#{target}(#{attrs[1]})"
+        elsif parent.document.basebackend? 'docbook'
+          "<citerefentry>\n" \
+            "<refentrytitle>#{target}</refentrytitle>" \
+            "<manvolnum>#{attrs[1]}</manvolnum>\n" \
+          "</citerefentry>\n"
+        end
+      end
+    end
+  end
+end
+
+Asciidoctor::Extensions.register do
+  inline_macro Perf::Documentation::LinkPerfProcessor, :linkperf
+end
-- 
2.16.3