[PATCH 4/5] scripts/kernel-doc: Use asciidoc instead of markdown

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By popular demand.

This needs some adjustment/fixups after feeding snippets to asciidoc
since compared to markdown asciidown escapes xml markup and doesn't
just let it through.

The other noticeable change is that build times increase a lot - we
need to launch the markup process per-snippet, there's a few thousand
of them and asciidoc (python) has a substantial higher overhead per
invocation than pandoc (haskell).

Cc: Danilo Cesar Lemes de Paula <danilo.cesar@xxxxxxxxxxxxxxx>
Cc: Thomas Wood <thomas.wood@xxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---
 Documentation/DocBook/Makefile |  6 +++---
 scripts/kernel-doc             | 12 +++++++++++-
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/Documentation/DocBook/Makefile b/Documentation/DocBook/Makefile
index 246ad38550e5..5335955c0de5 100644
--- a/Documentation/DocBook/Makefile
+++ b/Documentation/DocBook/Makefile
@@ -104,8 +104,8 @@ define rule_docproc
 endef
 
 %.xml: %.tmpl $(KERNELDOC) $(DOCPROC) $(KERNELDOCXMLREF) FORCE
-	@(which pandoc > /dev/null 2>&1) || \
-	(echo "*** To get propper documentation you need to install pandoc ***";)
+	@(which asciidoc > /dev/null 2>&1) || \
+	(echo "*** To get propper documentation you need to install asciidoc ***";)
 	$(call if_changed_rule,docproc)
 
 # Tell kbuild to always build the programs
@@ -116,7 +116,7 @@ notfoundtemplate = echo "*** You have to install docbook-utils or xmlto ***"; \
 db2xtemplate = db2TYPE -o $(dir $@) $<
 xmltotemplate = xmlto TYPE $(XMLTOFLAGS) -o $(dir $@) $<
 
-ifneq ($(shell which pandoc >/dev/null 2>&1 && echo found),found)
+ifneq ($(shell which asciidoc >/dev/null 2>&1 && echo found),found)
 	MARKDOWNREADY := "";
 endif
 
diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index e01e74f15a22..c8eed5299a4b 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -524,7 +524,7 @@ sub dump_doc_section {
 sub markdown_to_docbook {
 	my $orig_content = $_[0];
 
-	my $pid = open3( \*CHLD_IN, \*CHLD_OUT, \*CHLD_ERR, "pandoc  --columns=80 -f markdown -t docbook" );
+	my $pid = open3( \*CHLD_IN, \*CHLD_OUT, \*CHLD_ERR, "asciidoc  --no-header-footer --backend=docbook45 -" );
 
 	print CHLD_IN "$orig_content";
 	close(CHLD_IN);
@@ -605,6 +605,16 @@ sub output_highlight {
 #   print STDERR "contents af:$contents\n";
     if ($use_markdown) {
         $contents = markdown_to_docbook($contents);
+
+	# Compared to markdown asciidoc doesn't let through arbitrary xml
+	# markup. We need to un-escape the kerneldoc markup for functions,
+	# structures, ...
+	$contents =~ s/&lt;quote&gt;(\S*)&lt;\/quote&gt;/<quote>$1<\/quote>/g;
+	$contents =~ s/&lt;constant&gt;(\S*)&lt;\/constant&gt;/<constant>$1<\/constant>/g;
+	$contents =~ s/&lt;structname&gt;(\S*)&lt;\/structname&gt;/<structname>$1<\/structname>/g;
+	$contents =~ s/&lt;parameter&gt;(\S*)&lt;\/parameter&gt;/<parameter>$1<\/parameter>/g;
+	$contents =~ s/&lt;function&gt;(\S*)&lt;\/function&gt;/<function>$1<\/function>/g;
+	$contents =~ s/&lt;envar&gt;(\S*)&lt;\/envar&gt;/<envar>$1<\/envar>/g;
     }
 
 #   strip whitespaces when generating html5
-- 
2.5.1

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