From Bill.lists at Eccles.net  Wed Nov  4 18:06:19 2009
From: Bill.lists at Eccles.net (Bill Eccles)
Date: Wed, 4 Nov 2009 18:06:19 -0500
Subject: A Suggestion for Strikethrough Syntax
Message-ID: <81A1E838-5304-45B4-9075-D428551419AC@Eccles.net>

All,

Hopefully, I'm not covering old territory, and a search of the list  
archives seems to indicate that I'm not. If I am, then I extend my  
apologies in advance.

I use strikethrough a lot so I modify my Movable Type Markdown module  
as shown below, right about line 1040 or so. I assume other Markdown  
implementations can use this change as well:

sub _DoItalicsAndBold {
    my $text = shift;

    # <strong> must go first:
    $text =~ s{ (\*\*|__) (?=\S) (.+?[*_]*) (?<=\S) \1 }
        {<strong>$2</strong>}gsx;

    $text =~ s{ (\*|_) (?=\S) (.+?) (?<=\S) \1 }
        {<em>$2</em>}gsx;

    # These lines added by Bill Eccles, 2008-07-04
    $text =~ s{ (\s) (-) (?=\S) (.+?) (?<=\S) (-) }
    {$1<strike>$3</strike>}gsx;

    return $text;
}

It converts

    -text to be struck through-

to

    <strike>text to be struck through</strike>.

Simple, and it works for me.

(I detail it at <http://www.bill.eccles.net/bills_words/2008/07/a-test-entry-with-markdownstri.html 
 >.)

Thoughts?

/Bill
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From jgm at berkeley.edu  Thu Nov  5 13:05:39 2009
From: jgm at berkeley.edu (John MacFarlane)
Date: Thu, 5 Nov 2009 10:05:39 -0800
Subject: A Suggestion for Strikethrough Syntax
In-Reply-To: <81A1E838-5304-45B4-9075-D428551419AC@Eccles.net>
References: <81A1E838-5304-45B4-9075-D428551419AC@Eccles.net>
Message-ID: <20091105180539.GA3196@protagoras.phil.berkeley.edu>

+++ Bill Eccles [Nov 04 09 18:06 ]:
>    All,
> 
>    Hopefully, I'm not covering old territory, and a search of the list
>    archives seems to indicate that I'm not. If I am, then I extend my
>    apologies in advance.
> 
>    It converts
> 
>       -text to be struck through-
> 
>    to
> 
>       <strike>text to be struck through</strike>.
> 
>    Simple, and it works for me.

Pandoc uses this syntax in its markdown extensions:

~~text to be struck through~~

http://johnmacfarlane.net/pandoc/README.html#strikeout

One advantage of this over your proposal is that it doesn't require
a leading space, which is useful for edits and occasionally other
things (e.g. when you want to strike out the first word of a text):

apol~~l~~ogies
syntactic~~al~~
~~Dear Colleagues:~~To whom it may concern:

It also allows e.g. hyphenated words in struck-through
text:

~~permutation-invariant~~

Now that it's been in pandoc for a while, I'd be reluctant
to change this syntax, but it now strikes me that something
like the following would look better:

apol(~l~)ogies
syntactic(~al~)
(~permutation-invariant~)

John

From Bill.lists at Eccles.net  Mon Nov  9 18:55:35 2009
From: Bill.lists at Eccles.net (Bill Eccles)
Date: Mon, 9 Nov 2009 18:55:35 -0500
Subject: A Suggestion for Strikethrough Syntax
In-Reply-To: <mailman.47.1257526839.82431.markdown-discuss@six.pairlist.net>
References: <mailman.47.1257526839.82431.markdown-discuss@six.pairlist.net>
Message-ID: <539EBA5E-6680-4DEA-B3C4-4D400A8E693B@Eccles.net>

> Pandoc uses this syntax in its markdown extensions:
> 
> ~~text to be struck through~~
8< snip!
>
> Now that it's been in pandoc for a while, I'd be reluctant
> to change this syntax, but it now strikes me that something
> like the following would look better:
>
> apol(~l~)ogies
> syntactic(~al~)
> (~permutation-invariant~)
> 
> John

Actually, I like your double-tilde notation a lot better than my hyphen notation. It accomplishes much better what John set out to do, namely make something that looks like what it represents. And a tilde does look a lot like a scribble, which is a lot like what a strikethrough represents.

I don't much care for the parenthesis-laden notation, though. Doesn't quite look like what it represents as much as the double-tilde does.

I'd love to see Pandoc integrated with Movable Type. That'd be sweeeeeeet.

/Bill

From autarch at urth.org  Sun Nov 29 13:51:29 2009
From: autarch at urth.org (Dave Rolsky)
Date: Sun, 29 Nov 2009 12:51:29 -0600 (CST)
Subject: New Markdown parser in Perl: Markdent
Message-ID: <alpine.DEB.0.9999.0911291247440.32433@urth.org>

I've recently released a new Markdown parser in Perl, called Markdent. 
This differs from the existing Perl tools (and most other language tools 
I've seen) in that it's an event-driven parser.

This lets you analyze the document in much more interesting ways, as well 
as cache parse results (but not HTML generation), and do other fun stuff.

The module is also designed so that it's relatively easy(ish) to create 
Markdown dialects. Right now it ships with a dialect that supports David 
Wheeler's table syntax proposal at 
http://www.justatheory.com/computers/markup/markdown-table-rfc.html. The 
actual implementation is slightly different from David's proposal, but 
mostly with his blessing ;)

The module is on CPAN at http://search.cpan.org/dist/Markdent/

I also wrote a bit about why this module can be useful in a blog post at 
http://blog.urth.org/2009/11/whats-the-point-of-markdent.html


-dave

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