[PATCH v4 1/3] doc: introduce a synopsis typesetting

["Jean-Noël Avila via GitGitGadget" <gitgitgadget@gmail.com>]

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

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 processor for backticked text are modified. The
backends of asciidoc and asciidoctor take in charge to correctly add
the required typesetting.

Signed-off-by: Jean-Noël Avila <jn.avila@free.fr>
---
 Documentation/asciidoc.conf             | 20 ++++++
 Documentation/asciidoctor-extensions.rb | 87 +++++++++++++++++++++++++
 ci/install-dependencies.sh              |  1 +
 t/t0450-txt-doc-vs-help.sh              | 11 ++--
 4 files changed, 112 insertions(+), 7 deletions(-)

diff --git a/Documentation/asciidoc.conf b/Documentation/asciidoc.conf
index 60f76f43eda..75ae9f3da92 100644
--- a/Documentation/asciidoc.conf
+++ b/Documentation/asciidoc.conf
@@ -28,6 +28,10 @@ ifdef::backend-docbook[]
 {0#<citerefentry>}
 {0#<refentrytitle>{target}</refentrytitle><manvolnum>{0}</manvolnum>}
 {0#</citerefentry>}
+
+[literal-inlinemacro]
+{eval:re.sub(r'(&lt;[-a-zA-Z0-9.]+&gt;)', r'<emphasis>\1</emphasis>', re.sub(r'([\[\s|()>]|^|\]|&gt;)(\.?([-a-zA-Z0-9:+=~@,\/_^\$]+\.?)+)',r'\1<literal>\2</literal>', re.sub(r'(\.\.\.?)([^\]$.])', r'<literal>\1</literal>\2', macros.passthroughs[int(attrs['passtext'][1:-1])] if attrs['passtext'][1:-1].isnumeric() else attrs['passtext'][1:-1])))}
+
 endif::backend-docbook[]
 
 ifdef::backend-docbook[]
@@ -56,4 +60,20 @@ ifdef::backend-xhtml11[]
 git-relative-html-prefix=
 [linkgit-inlinemacro]
 <a href="{git-relative-html-prefix}{target}.html">{target}{0?({0})}</a>
+
+[literal-inlinemacro]
+{eval:re.sub(r'(&lt;[-a-zA-Z0-9.]+&gt;)', r'<em>\1</em>', re.sub(r'([\[\s|()>]|^|\]|&gt;)(\.?([-a-zA-Z0-9:+=~@,\/_^\$]+\.?)+)',r'\1<code>\2</code>', re.sub(r'(\.\.\.?)([^\]$.])', r'<code>\1</code>\2', macros.passthroughs[int(attrs['passtext'][1:-1])] if attrs['passtext'][1:-1].isnumeric() else attrs['passtext'][1:-1])))}
+
+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 d906a008039..cb24480b63d 100644
--- a/Documentation/asciidoctor-extensions.rb
+++ b/Documentation/asciidoctor-extensions.rb
@@ -1,5 +1,7 @@
 require 'asciidoctor'
 require 'asciidoctor/extensions'
+require 'asciidoctor/converter/docbook5'
+require 'asciidoctor/converter/html5'
 
 module Git
   module Documentation
@@ -39,10 +41,95 @@ 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(/(\.\.\.?)([^\]$.])/, '`\1`\2')
+           .gsub(%r{([\[\] |()>]|^)([-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
+
+    class GitDBConverter < Asciidoctor::Converter::DocBook5Converter
+
+      extend Asciidoctor::Converter::Config
+      register_for 'docbook5'
+
+      def convert_inline_quoted node
+        if (type = node.type) == :asciimath
+          # NOTE fop requires jeuclid to process mathml markup
+          asciimath_available? ? %(<inlineequation>#{(::AsciiMath.parse node.text).to_mathml 'mml:', 'xmlns:mml' => 'http://www.w3.org/1998/Math/MathML'}</inlineequation>) : %(<inlineequation><mathphrase><![CDATA[#{node.text}]]></mathphrase></inlineequation>)
+        elsif type == :latexmath
+          # unhandled math; pass source to alt and required mathphrase element; dblatex will process alt as LaTeX math
+          %(<inlineequation><alt><![CDATA[#{equation = node.text}]]></alt><mathphrase><![CDATA[#{equation}]]></mathphrase></inlineequation>)
+        elsif type == :monospaced
+          node.text.gsub(/(\.\.\.?)([^\]$.])/, '<literal>\1</literal>\2')
+              .gsub(%r{([\[\s|()>.]|^|\]|&gt;)(\.?([-a-zA-Z0-9:+=~@,/_^\$]+\.{0,2})+)}, '\1<literal>\2</literal>')
+              .gsub(/(&lt;[-a-zA-Z0-9.]+&gt;)/, '<emphasis>\1</emphasis>')
+        else
+          open, close, supports_phrase = QUOTE_TAGS[type]
+          text = node.text
+          if node.role
+            if supports_phrase
+              quoted_text = %(#{open}<phrase role="#{node.role}">#{text}</phrase>#{close})
+            else
+              quoted_text = %(#{open.chop} role="#{node.role}">#{text}#{close})
+            end
+          else
+            quoted_text = %(#{open}#{text}#{close})
+          end
+          node.id ? %(<anchor#{common_attributes node.id, nil, text}/>#{quoted_text}) : quoted_text
+        end
+      end
+    end
+
+    # register a html5 converter that takes in charge to convert monospaced text into Git style synopsis
+    class GitHTMLConverter < Asciidoctor::Converter::Html5Converter
+
+      extend Asciidoctor::Converter::Config
+      register_for 'html5'
+
+      def convert_inline_quoted node
+        if node.type == :monospaced
+          node.text.gsub(/(\.\.\.?)([^\]$.])/, '<code>\1</code>\2')
+              .gsub(%r{([\[\s|()>.]|^|\]|&gt;)(\.?([-a-zA-Z0-9:+=~@,/_^\$]+\.{0,2})+)}, '\1<code>\2</code>')
+              .gsub(/(&lt;[-a-zA-Z0-9.]+&gt;)/, '<em>\1</em>')
+
+        else
+          open, close, tag = QUOTE_TAGS[node.type]
+          if node.id
+            class_attr = node.role ? %( class="#{node.role}") : ''
+            if tag
+              %(#{open.chop} id="#{node.id}"#{class_attr}>#{node.text}#{close})
+            else
+              %(<span id="#{node.id}"#{class_attr}>#{open}#{node.text}#{close}</span>)
+            end
+          elsif node.role
+            if tag
+              %(#{open.chop} class="#{node.role}">#{node.text}#{close})
+            else
+              %(<span class="#{node.role}">#{open}#{node.text}#{close}</span>)
+            end
+          else
+            %(#{open}#{node.text}#{close})
+          end
+        end
+      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/ci/install-dependencies.sh b/ci/install-dependencies.sh
index 4781cd20bb0..3e3ae39cbb1 100755
--- a/ci/install-dependencies.sh
+++ b/ci/install-dependencies.sh
@@ -107,6 +107,7 @@ Documentation)
 
 	test -n "$ALREADY_HAVE_ASCIIDOCTOR" ||
 	sudo gem install --version 1.5.8 asciidoctor
+	sudo gem install concurrent-ruby
 	;;
 esac
 
diff --git a/t/t0450-txt-doc-vs-help.sh b/t/t0450-txt-doc-vs-help.sh
index 69917d7b845..f99a69ae1b7 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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