[3/5] scripts/kernel-doc: Improve Markdown results

Submitted by Daniel Vetter on Nov. 25, 2015, 5:07 p.m.

Details

Message ID 1448471279-19748-4-git-send-email-daniel.vetter@ffwll.ch
State New
Headers show
Series "Better markup for GPU DocBook" ( rev: 1 ) in Intel GFX

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Commit Message

Daniel Vetter Nov. 25, 2015, 5:07 p.m.
From: Danilo Cesar Lemes de Paula <danilo.cesar@collabora.co.uk>

Using pandoc as the Markdown engine cause some minor side effects as
pandoc includes  main <para> tags for almost everything.
Original Markdown support approach removes those main tags, but it caused
some inconsistencies when that tag is not the main one, like:
<something>..</something>
<para>...</para>

As kernel-doc was already including a <para> tag, it causes the presence
of double <para> tags (<para><para>), which is not supported by DocBook
spec.

Html target gets away with it, so it causes no harm, although other
targets might not be so lucky (pdf as example).

We're now delegating the inclusion of the main <para> tag to pandoc
only, as it knows when it's necessary or not.

That behavior causes a corner case, the only situation where we're
certainly that <para> is not needed, which is the <refpurpose> content.
For those cases, we're using a $output_markdown_nopara = 1 control var.

Signed-off-by: Danilo Cesar Lemes de Paula <danilo.cesar@collabora.co.uk>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Stephan Mueller <smueller@chronox.de>
Cc: Michal Marek <mmarek@suse.cz>
Cc: linux-kernel@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: intel-gfx <intel-gfx@lists.freedesktop.org>
Cc: dri-devel <dri-devel@lists.freedesktop.org>
Cc: Graham Whaley <graham.whaley@linux.intel.com>
---
 scripts/kernel-doc | 48 ++++++++++++++++++++++++++++++++++--------------
 1 file changed, 34 insertions(+), 14 deletions(-)

Patch hide | download patch | download mbox

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 28737053395a..e01e74f15a22 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -288,6 +288,7 @@  my $use_markdown = 0;
 my $verbose = 0;
 my $output_mode = "man";
 my $output_preformatted = 0;
+my $output_markdown_nopara = 0;
 my $no_doc_sections = 0;
 my @highlights = @highlights_man;
 my $blankline = $blankline_man;
@@ -538,8 +539,11 @@  sub markdown_to_docbook {
 	close(CHLD_OUT);
 	close(CHLD_ERR);
 
-	# pandoc insists in adding Main <para></para>, we should remove them.
-	$content =~ s:\A\s*<para>\s*\n(.*)\n</para>\Z$:$1:egsm;
+	if ($output_markdown_nopara) {
+		# pandoc insists in adding Main <para></para>, sometimes we
+		# want to remove them.
+		$content =~ s:\A\s*<para>\s*\n(.*)\n</para>\Z$:$1:egsm;
+	}
 
 	return $content;
 }
@@ -614,7 +618,7 @@  sub output_highlight {
 	    $line =~ s/^\s*//;
 	}
 	if ($line eq ""){
-	    if (! $output_preformatted) {
+	    if (! $output_preformatted && ! $use_markdown) {
 		print $lineprefix, local_unescape($blankline);
 	    }
 	} else {
@@ -1035,7 +1039,7 @@  sub output_section_xml(%) {
 	    # programlisting is already included by pandoc
 	    print "<programlisting>\n" unless $use_markdown;
 	    $output_preformatted = 1;
-	} else {
+	} elsif (! $use_markdown) {
 	    print "<para>\n";
 	}
 	output_highlight($args{'sections'}{$section});
@@ -1043,7 +1047,7 @@  sub output_section_xml(%) {
 	if ($section =~ m/EXAMPLE/i) {
 	    print "</programlisting>\n" unless $use_markdown;
 	    print "</informalexample>\n";
-	} else {
+	} elsif (! $use_markdown) {
 	    print "</para>\n";
 	}
 	print "</refsect1>\n";
@@ -1075,7 +1079,9 @@  sub output_function_xml(%) {
     print " <refname>" . $args{'function'} . "</refname>\n";
     print " <refpurpose>\n";
     print "  ";
+    $output_markdown_nopara = 1;
     output_highlight ($args{'purpose'});
+    $output_markdown_nopara = 0;
     print " </refpurpose>\n";
     print "</refnamediv>\n";
 
@@ -1113,10 +1119,12 @@  sub output_function_xml(%) {
 	    $parameter_name =~ s/\[.*//;
 
 	    print "  <varlistentry>\n   <term><parameter>$parameter</parameter></term>\n";
-	    print "   <listitem>\n    <para>\n";
+	    print "   <listitem>\n";
+	    print "    <para>\n" unless $use_markdown;
 	    $lineprefix="     ";
 	    output_highlight($args{'parameterdescs'}{$parameter_name});
-	    print "    </para>\n   </listitem>\n  </varlistentry>\n";
+	    print "    </para>\n" unless $use_markdown;
+	    print "   </listitem>\n  </varlistentry>\n";
 	}
 	print " </variablelist>\n";
     } else {
@@ -1152,7 +1160,9 @@  sub output_struct_xml(%) {
     print " <refname>" . $args{'type'} . " " . $args{'struct'} . "</refname>\n";
     print " <refpurpose>\n";
     print "  ";
+    $output_markdown_nopara = 1;
     output_highlight ($args{'purpose'});
+    $output_markdown_nopara = 0;
     print " </refpurpose>\n";
     print "</refnamediv>\n";
 
@@ -1205,9 +1215,11 @@  sub output_struct_xml(%) {
       ($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
       print "    <varlistentry>";
       print "      <term>$parameter</term>\n";
-      print "      <listitem><para>\n";
+      print "      <listitem>\n";
+      print "         <para>\n" unless $use_markdown;
       output_highlight($args{'parameterdescs'}{$parameter_name});
-      print "      </para></listitem>\n";
+      print "         </para>\n" unless $use_markdown;
+      print "      </listitem>\n";
       print "    </varlistentry>\n";
     }
     print "  </variablelist>\n";
@@ -1246,7 +1258,9 @@  sub output_enum_xml(%) {
     print " <refname>enum " . $args{'enum'} . "</refname>\n";
     print " <refpurpose>\n";
     print "  ";
+    $output_markdown_nopara = 1;
     output_highlight ($args{'purpose'});
+    $output_markdown_nopara = 0;
     print " </refpurpose>\n";
     print "</refnamediv>\n";
 
@@ -1276,9 +1290,11 @@  sub output_enum_xml(%) {
 
       print "    <varlistentry>";
       print "      <term>$parameter</term>\n";
-      print "      <listitem><para>\n";
+      print "      <listitem>\n";
+      print "         <para>\n" unless $use_markdown;
       output_highlight($args{'parameterdescs'}{$parameter_name});
-      print "      </para></listitem>\n";
+      print "         </para>\n" unless $use_markdown;
+      print "      </listitem>\n";
       print "    </varlistentry>\n";
     }
     print "  </variablelist>\n";
@@ -1344,14 +1360,14 @@  sub output_blockhead_xml(%) {
 	if ($section =~ m/EXAMPLE/i) {
 	    print "<example><para>\n";
 	    $output_preformatted = 1;
-	} else {
+	} elsif (! $use_markdown) {
 	    print "<para>\n";
 	}
 	output_highlight($args{'sections'}{$section});
 	$output_preformatted = 0;
 	if ($section =~ m/EXAMPLE/i) {
 	    print "</para></example>\n";
-	} else {
+	} elsif (! $use_markdown) {
 	    print "</para>";
 	}
 	if (!$args{'content-only'}) {
@@ -2721,7 +2737,11 @@  sub process_file($) {
 		{
 			if ( $1 eq "" )
 			{
-				$contents .= $blankline;
+				if ($use_markdown) {
+					$contents .= "\n";
+				} else {
+					$contents .= $blankline;
+				}
 			}
 			else
 			{