Simplifying pandoc's HTML output even more

Simplifying pandoc's HTML output even more

[Marc Haber]

Hi,

I am using pandoc to generate simple HTML from markdown. Simple HTML
is required because the german tax authority wants footnotes and
explanation in a rather limited subset of XHTML.

For example, here a test markdown input:
  Right     Left     Center     Default
-------   ------   --------     -------
12        12       12           12
123       123      123          123
1         1        1            1

This creates the following HTML:
<table>
<thead>
<tr class="header">
<th align="right">Right</th>
<th align="right">Left</th>
<th align="right">Center</th>
<th>Default</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td align="right">12</td>
<td align="right">12</td>
<td align="right">12</td>
<td>12</td>
</tr>
<tr class="even">
<td align="right">123</td>
<td align="right">123</td>
<td align="right">123</td>
<td>123</td>
</tr>
<tr class="odd">
<td align="right">1</td>
<td align="right">1</td>
<td align="right">1</td>
<td>1</td>
</tr>
</tbody>
</table>

This HTML does not pass tax validation due to the thead and tbody and
the class attribute to the tr tag.

Can I make pandoc omit those tags and attributes, or do I need to do
post-processing of the generated HTML?

Greetings
Marc


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Re: Simplifying pandoc's HTML output even more

[BP Jonsson]

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If you make a list of everything you want changed/removed in terms of HTML
I'll try to write an HTML filter.

/bpj

lör 11 feb. 2017 kl. 22:14 skrev Marc Haber <mh+pandoc-discuss@zugschlus.de
>:

> Hi,
>
> I am using pandoc to generate simple HTML from markdown. Simple HTML
> is required because the german tax authority wants footnotes and
> explanation in a rather limited subset of XHTML.
>
> For example, here a test markdown input:
>   Right     Left     Center     Default
> -------   ------   --------     -------
> 12        12       12           12
> 123       123      123          123
> 1         1        1            1
>
> This creates the following HTML:
> <table>
> <thead>
> <tr class="header">
> <th align="right">Right</th>
> <th align="right">Left</th>
> <th align="right">Center</th>
> <th>Default</th>
> </tr>
> </thead>
> <tbody>
> <tr class="odd">
> <td align="right">12</td>
> <td align="right">12</td>
> <td align="right">12</td>
> <td>12</td>
> </tr>
> <tr class="even">
> <td align="right">123</td>
> <td align="right">123</td>
> <td align="right">123</td>
> <td>123</td>
> </tr>
> <tr class="odd">
> <td align="right">1</td>
> <td align="right">1</td>
> <td align="right">1</td>
> <td>1</td>
> </tr>
> </tbody>
> </table>
>
> This HTML does not pass tax validation due to the thead and tbody and
> the class attribute to the tr tag.
>
> Can I make pandoc omit those tags and attributes, or do I need to do
> post-processing of the generated HTML?
>
> Greetings
> Marc
>
>
> --
>
> -----------------------------------------------------------------------------
> Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
> Leimen, Germany    |  lose things."    Winona Ryder | Fon: *49 6224 1600402
> Nordisch by Nature |  How to make an American Quilt | Fax: *49 6224 1600421
>
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[-- Attachment #2: Type: text/html, Size: 7338 bytes --]

Re: Simplifying pandoc's HTML output even more

[Marc Haber]

On Sat, Feb 11, 2017 at 10:00:04PM +0000, BP Jonsson wrote:
> If you make a list of everything you want changed/removed in terms of HTML
> I'll try to write an HTML filter.

So, pandoc's output is not configurable in this regard, there a no
run-time changeable termplates being used?

Greetings
Marc

-- 
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Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany    |  lose things."    Winona Ryder | Fon: *49 6224 1600402
Nordisch by Nature |  How to make an American Quilt | Fax: *49 6224 1600421

Re: Simplifying pandoc's HTML output even more

[BP Jonsson]

[-- Attachment #1: Type: text/plain, Size: 1376 bytes --]

Den 2017-02-12 kl. 08:10, skrev Marc Haber:
> So, pandoc's output is not configurable in this regard, there a no
> run-time changeable termplates being used?

No, you have to post-process. When I need to do that I usually
write an HTML filter based on [Mojo::DOM][] like the one attached
(which should do the trick for you if thead, tbody and tr.class
are the only issues. Of course you need [perl][][^1] and the
Mojo::DOM [modules][] installed, but that should be a piece of
cake, then pipe pandoc's output through the html filter:

     $ pandoc input.md | perl strip-table-parts.pl > output.html

[Mojo::DOM]: https://metacpan.org/pod/Mojo::DOM
[perl]:      https://www.perl.org/get.html
[modules]:   http://www.cpan.org/modules/INSTALL.html

[^1]:   I recommend Strawberry Perl if you are on Windows.

/bpj

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[-- Attachment #2: strip-table-parts.pl --]
[-- Type: text/x-perl, Size: 749 bytes --]

#!/usr/bin/env perl

# strip thead, tbody tags and tr classes from HTML (as produced by pandoc)

use utf8;
use strict;
use warnings;
use warnings  qw(FATAL utf8);
use open      qw(:std :utf8);

use Mojo::DOM;

sub trim {
    my($string) = @_;
    $string =~ s/\A\s+//;   # remove leading whitespace
    $string =~ s/\s+\z//;   # remove trailing whitespace
    return $string;
}

my $html = do { local $/; <>; }; # slurp STDIN

my $dom = Mojo::DOM->new($html);

my $stripped = $dom->find('thead, tbody');

for my $elem ( @$stripped ) {
    # trim content so no empty lines inside table
    $elem->replace( trim $elem->content );
}

my $trs = $dom->find('tr');

for my $tr ( @$trs ) {
    delete $tr->attr->{class};
}

print $dom->to_string;

__END__

Re: Simplifying pandoc's HTML output even more

[Marc Haber]

On Mon, Feb 13, 2017 at 01:33:30PM +0100, BP Jonsson wrote:
> No, you have to post-process. When I need to do that I usually
> write an HTML filter based on [Mojo::DOM][] like the one attached
> (which should do the trick for you if thead, tbody and tr.class
> are the only issues. Of course you need [perl][][^1] and the
> Mojo::DOM [modules][] installed, but that should be a piece of
> cake, then pipe pandoc's output through the html filter:
> 
>     $ pandoc input.md | perl strip-table-parts.pl > output.html

Thanks for the code and the insight into Mojo::DOM, but writing a
custom lua filter was easier for me. I'll keep Mojo::DOM in mind though.

Greetings
Marc

-- 
-----------------------------------------------------------------------------
Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany    |  lose things."    Winona Ryder | Fon: *49 6224 1600402
Nordisch by Nature |  How to make an American Quilt | Fax: *49 6224 1600421

Re: Simplifying pandoc's HTML output even more

[John MacFarlane]

Another option is to use a custom lua writer (see
the manual).

The example included with pandoc (data/sample.lua)
generates HTML, so it would be easy to modify this
slightly for your needs.

+++ Marc Haber [Feb 12 17 08:10 ]:
>On Sat, Feb 11, 2017 at 10:00:04PM +0000, BP Jonsson wrote:
>> If you make a list of everything you want changed/removed in terms of HTML
>> I'll try to write an HTML filter.
>
>So, pandoc's output is not configurable in this regard, there a no
>run-time changeable termplates being used?
>
>Greetings
>Marc
>
>-- 
>-----------------------------------------------------------------------------
>Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
>Leimen, Germany    |  lose things."    Winona Ryder | Fon: *49 6224 1600402
>Nordisch by Nature |  How to make an American Quilt | Fax: *49 6224 1600421
>
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>You received this message because you are subscribed to the Google Groups "pandoc-discuss" group.
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>To view this discussion on the web visit https://groups.google.com/d/msgid/pandoc-discuss/20170212071012.GI2488%40torres.zugschlus.de.
>For more options, visit https://groups.google.com/d/optout.

Re: Simplifying pandoc's HTML output even more

[Marc Haber]

On Mon, Feb 13, 2017 at 04:27:05PM +0100, John MacFarlane wrote:
> Another option is to use a custom lua writer (see
> the manual).
> 
> The example included with pandoc (data/sample.lua)
> generates HTML, so it would be easy to modify this
> slightly for your needs.

Perfect. Thanks!

Greetings
Marc

-- 
-----------------------------------------------------------------------------
Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany    |  lose things."    Winona Ryder | Fon: *49 6224 1600402
Nordisch by Nature |  How to make an American Quilt | Fax: *49 6224 1600421

Re: Simplifying pandoc's HTML output even more

[John MacFarlane]

+++ Marc Haber [Feb 11 17 22:14 ]:
>Can I make pandoc omit those tags and attributes, or do I need to do
>post-processing of the generated HTML?

No, you need to do post-processing.