[PATCH v2 1/3] doc: introduce a synopsis custom paragraph attribute

["Jean-Noël Avila via GitGitGadget" <gitgitgadget@xxxxxxxxx>]

From: =?UTF-8?q?Jean-No=C3=ABl=20Avila?= <jn.avila@xxxxxxx>

In order to follow the common manpage usage, the synopsis of the
commands needs to be heavily typeset. A first try was performed with
using native markup, but it turned out to make the document source
almost unreadable, difficult to write and prone to mistakes with
unwanted Asciidoc's role attributes.

In order to both simplify the writer's task and obtain a consistant
typesetting in the synopsis, a custom 'synopsis' paragraph type is
created and the backends of asciidoc and asciidoctor take in charge to
correctly add the required typesetting.

Signed-off-by: Jean-Noël Avila <jn.avila@xxxxxxx>
---
 Documentation/asciidoc.conf             | 12 ++++++++++++
 Documentation/asciidoctor-extensions.rb | 17 +++++++++++++++++
 t/t0450-txt-doc-vs-help.sh              | 11 ++++-------
 3 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/Documentation/asciidoc.conf b/Documentation/asciidoc.conf
index 60f76f43edab..08111e98ab33 100644
--- a/Documentation/asciidoc.conf
+++ b/Documentation/asciidoc.conf
@@ -57,3 +57,15 @@ git-relative-html-prefix=
 [linkgit-inlinemacro]
 <a href="{git-relative-html-prefix}{target}.html">{target}{0?({0})}</a>
 endif::backend-xhtml11[]
+
+ifdef::backend-docbook[]
+ifdef::doctype-manpage[]
+[paradef-default]
+synopsis-style=template="verseparagraph",filter="sed -E 's!([\[ |()>]|^|\])([-=a-zA-Z0-9:+.]+)!\\1<literal>\\2</literal>!g;s!&lt;[-a-zA-Z0-9.]+&gt;!<emphasis>\\0</emphasis>!g'"
+endif::doctype-manpage[]
+endif::backend-docbook[]
+
+ifdef::backend-xhtml11[]
+[paradef-default]
+synopsis-style=template="verseparagraph",filter="sed -E 's!([\[ |()>]|^|\])([-=a-zA-Z0-9:+.]+)!\\1<code>\\2</code>!g;s!&lt;[-a-zA-Z0-9.]+&gt;!<em>\\0</em>!g'"
+endif::backend-xhtml11[]
diff --git a/Documentation/asciidoctor-extensions.rb b/Documentation/asciidoctor-extensions.rb
index d906a008039c..8c7612743504 100644
--- a/Documentation/asciidoctor-extensions.rb
+++ b/Documentation/asciidoctor-extensions.rb
@@ -39,10 +39,27 @@ module Git
         output
       end
     end
+
+    class SynopsisBlock < Asciidoctor::Extensions::BlockProcessor
+
+      use_dsl
+      named :synopsis
+      parse_content_as :simple
+
+      def process parent, reader, attrs
+        outlines = reader.lines.map do |l|
+          l.gsub(/([\[\] |()>]|^)([-a-zA-Z0-9:+=.]+)/, '\\1{empty}`\\2`{empty}')
+           .gsub(/(<[-a-zA-Z0-9.]+>)/, '__\\1__')
+           .gsub(']', ']{empty}')
+        end
+        create_block parent, :verse, outlines, attrs
+      end
+    end
   end
 end
 
 Asciidoctor::Extensions.register do
   inline_macro Git::Documentation::LinkGitProcessor, :linkgit
+  block Git::Documentation::SynopsisBlock
   postprocessor Git::Documentation::DocumentPostProcessor
 end
diff --git a/t/t0450-txt-doc-vs-help.sh b/t/t0450-txt-doc-vs-help.sh
index 69917d7b8459..f99a69ae1b74 100755
--- a/t/t0450-txt-doc-vs-help.sh
+++ b/t/t0450-txt-doc-vs-help.sh
@@ -56,14 +56,11 @@ txt_to_synopsis () {
 	fi &&
 	b2t="$(builtin_to_txt "$builtin")" &&
 	sed -n \
-		-e '/^\[verse\]$/,/^$/ {
+		-E '/^\[(verse|synopsis)\]$/,/^$/ {
 			/^$/d;
-			/^\[verse\]$/d;
-			s/_//g;
-			s/++//g;
-			s/`//g;
-			s/{litdd}/--/g;
-			s/'\''\(git[ a-z-]*\)'\''/\1/g;
+			/^\[(verse|synopsis)\]$/d;
+			s/\{litdd\}/--/g;
+			s/'\''(git[ a-z-]*)'\''/\1/g;
 
 			p;
 		}' \
-- 
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