Re: [PATCH v2 1/2] doc: add an option to have Asciidoctor build man pages directly

[Jeff King <peff@peff.net>]

On Fri, May 14, 2021 at 12:58:12PM +0900, Junio C Hamano wrote:

> > diff --git a/Documentation/Makefile b/Documentation/Makefile
> > index 2aae4c9cbb..891181c0f3 100644
> > --- a/Documentation/Makefile
> > +++ b/Documentation/Makefile
> > @@ -192,10 +192,16 @@ ASCIIDOC_HTML = xhtml5
> >  ASCIIDOC_DOCBOOK = docbook5
> >  ASCIIDOC_EXTRA += -acompat-mode -atabsize=8
> >  ASCIIDOC_EXTRA += -I. -rasciidoctor-extensions
> > -ASCIIDOC_EXTRA += -alitdd='&\#x2d;&\#x2d;'
> > +TXT_TO_HTML += -alitdd='&\#x2d;&\#x2d;'
> > +TXT_TO_XML  += -alitdd='&\#x2d;&\#x2d;'
> >  DBLATEX_COMMON =
> >  XMLTO_EXTRA += --skip-validation
> >  XMLTO_EXTRA += -x manpage.xsl
> > +ifdef USE_ASCIIDOCTOR_MANPAGE
> > +TXT_TO_MAN = $(ASCIIDOC_COMMON) -b manpage
> > +TXT_TO_MAN += -aplus='+'
> > +TXT_TO_MAN += -alitdd='\--'
> > +endif
> >  endif
> 
> This hunk is wholly inside USE_ASCIIDOCTOR and deals with {litdd}
> and {plus}, which are defined in asciidoc.conf that is not read by
> Asciidoctor, so we'd need to be careful to keep these three places
> (i.e. TXT_TO_HTML, TXT_TO_XML and TXT_TO_MAN) in sync with the
> asciidoct.conf file.
> 
> It is curious that {plus} for Asciidoctor is deffined only for
> manpages and HTML/XML side lacks the definition.  Intended?

I don't think it's needed on the HTML/XML side, as AsciiDoctor ships
with reasonable conversions there to HTML entities. It's only for the
direct-to-manpage path that needs them. This is probably a bug in
AsciiDoctor, but I haven't investigated fully.

> It seems that the latter has several more "attributes" defined that
> we do not replicate in the Makefile---I wonder if that is a sign
> that we can get rid of entries for asterisk, caret, startsb,
> etc. from asciidoc.conf?

I don't think so. Even though AsciiDoctor ships with sensible values for
those attributes, AsciiDoc doesn't seem to. Try committing something
like this and then running "./doc-diff HEAD^ HEAD", which shows all
kinds of problems.

-- >8 --
Subject: drop maybe unused attributes

---
 Documentation/asciidoc.conf | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/Documentation/asciidoc.conf b/Documentation/asciidoc.conf
index 3e4c13971b..75f01e2fa1 100644
--- a/Documentation/asciidoc.conf
+++ b/Documentation/asciidoc.conf
@@ -11,15 +11,7 @@
 (?su)[\\]?(?P<name>linkgit):(?P<target>\S*?)\[(?P<attrlist>.*?)\]=
 
 [attributes]
-asterisk=&#42;
 plus=&#43;
-caret=&#94;
-startsb=&#91;
-endsb=&#93;
-backslash=&#92;
-tilde=&#126;
-apostrophe=&#39;
-backtick=&#96;
 litdd=&#45;&#45;
 
 ifdef::backend-docbook[]
-- 
2.31.1.1062.g531ce38507