markdown - pdf two way sync

markdown - pdf two way sync

[Andrey Ustyuzhanin]

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Hi all!

I use pandoc to generate slides of my presentation from markdown. And one 
useful use-case would be to navigate from PDF to source and back (think of 
PDF-Sync 
https://sourceforge.net/p/skim-app/wiki/TeX_and_PDF_Synchronization/#tex-pdf-synchronization). 
Are there any out-of-the-box receipts I can follow? otherwise I thought 
such synchronization can be performed if pandoc allowed to store mapping 
between md and tex files. But I couldn't find any hint how can I do it?
Thank you in advance! 

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Re: markdown - pdf two way sync

[John MACFARLANE]

Pandoc doesn't store any source-mapping information in
the AST.

+++ Andrey Ustyuzhanin [May 03 16 02:42 ]:
>   Hi all!
>   I use pandoc to generate slides of my presentation from markdown. And
>   one useful use-case would be to navigate from PDF to source and back
>   (think of PDF-Sync
>   https://sourceforge.net/p/skim-app/wiki/TeX_and_PDF_Synchronization/#te
>   x-pdf-synchronization). Are there any out-of-the-box receipts I can
>   follow? otherwise I thought such synchronization can be performed if
>   pandoc allowed to store mapping between md and tex files. But I
>   couldn't find any hint how can I do it?
>   Thank you in advance!
>
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Re: markdown - pdf two way sync

[BH]

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On Tuesday, May 3, 2016 at 2:39:05 PM UTC-4, John MacFarlane wrote:
>
> Pandoc doesn't store any source-mapping information in 
> the AST. 
>

This is, of course, right, but two-way sync (in both directions) is 
possible nonetheless (albeit in a way that's quite fragile). Here's the 
rough idea (both requiring that pdfsync be used when compiling the .pdf 
file):

1. For backward search (from .pdf to .md): have the .pdf viewer send the 
source (.tex) file and line number to a script that (a) reads in the 
relevant line from the .tex file, (b) extracts a reasonable-sized chunk of 
text, (c) searches for that text in the corresponding markdown file, and 
finally (d) sends the line number of that text to the text editor.

2. For forward search (from .md to .pdf) do the opposite: have the text 
editor send the source (.md) file and line number to a script that (a) 
reads in the relevant line from the .md file, (b) extracts a 
reasonable-sized chunk of text, (c) searches for that text in the 
corresponding .tex file, and finally (d) sends the line number of that text 
to the .pdf viewer.

Clearly, a problem lies in step (b) in both cases: how do you locate the 
relevant text to use in searching the corresponding file for? What I've 
done differs between (1) and (2).

In (2), I find it easiest to take the whole line of markdown, strip off any 
initial markdown codes (such as those for enumerated lists), run it through 
pandoc (using exactly the same options I use to generate the .pdf in the 
first place) to convert to LaTeX, and then search for this in the .tex file.

In (1), I find I need to use a different strategy, since .tex -> .md 
conversion in pandoc often fails to produce a match in the .md file. (This 
is partly because of the way I have extended markdown using some filters.) 
So here I try to locate a stretch of text in the .tex file that does not 
contain any LaTeX commands as follows: I try searching for the first 
occurrence of '\' in the relevant line, and if this occurs deep enough into 
the text, I grab text from the beginning of the line to that point. If not, 
I look for a stretch of text after that '\' that occurs between '{' and 
'}'. Usually this is good enough to find a unique match in the markdown 
file.

As I said, this is fragile: it won't work in every case, but for me it 
works about 90-95% of the time, which is good enough for my purposes.

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Re: markdown - pdf two way sync

[J]

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Is it possible to sync between markdown and pdf, or between markdown and 
docx nowadays ? Many thanks !

On Saturday, May 14, 2016 at 11:50:25 PM UTC+8 BH wrote:

> On Tuesday, May 3, 2016 at 2:39:05 PM UTC-4, John MacFarlane wrote:
>>
>> Pandoc doesn't store any source-mapping information in 
>> the AST. 
>>
>
> This is, of course, right, but two-way sync (in both directions) is 
> possible nonetheless (albeit in a way that's quite fragile). Here's the 
> rough idea (both requiring that pdfsync be used when compiling the .pdf 
> file):
>
> 1. For backward search (from .pdf to .md): have the .pdf viewer send the 
> source (.tex) file and line number to a script that (a) reads in the 
> relevant line from the .tex file, (b) extracts a reasonable-sized chunk of 
> text, (c) searches for that text in the corresponding markdown file, and 
> finally (d) sends the line number of that text to the text editor.
>
> 2. For forward search (from .md to .pdf) do the opposite: have the text 
> editor send the source (.md) file and line number to a script that (a) 
> reads in the relevant line from the .md file, (b) extracts a 
> reasonable-sized chunk of text, (c) searches for that text in the 
> corresponding .tex file, and finally (d) sends the line number of that text 
> to the .pdf viewer.
>
> Clearly, a problem lies in step (b) in both cases: how do you locate the 
> relevant text to use in searching the corresponding file for? What I've 
> done differs between (1) and (2).
>
> In (2), I find it easiest to take the whole line of markdown, strip off 
> any initial markdown codes (such as those for enumerated lists), run it 
> through pandoc (using exactly the same options I use to generate the .pdf 
> in the first place) to convert to LaTeX, and then search for this in the 
> .tex file.
>
> In (1), I find I need to use a different strategy, since .tex -> .md 
> conversion in pandoc often fails to produce a match in the .md file. (This 
> is partly because of the way I have extended markdown using some filters.) 
> So here I try to locate a stretch of text in the .tex file that does not 
> contain any LaTeX commands as follows: I try searching for the first 
> occurrence of '\' in the relevant line, and if this occurs deep enough into 
> the text, I grab text from the beginning of the line to that point. If not, 
> I look for a stretch of text after that '\' that occurs between '{' and 
> '}'. Usually this is good enough to find a unique match in the markdown 
> file.
>
> As I said, this is fragile: it won't work in every case, but for me it 
> works about 90-95% of the time, which is good enough for my purposes.
>

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