Re: How to suppress title attribute in a CommonMark image link?

[John MACFARLANE <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org>]

Hm.  Don't know what RMarkdown is doing with this.

+++ Jennifer Bryan [Oct 13 17 11:16 ]:
>   My problem is occurring at arm's length inside an R Markdown workflow
>   (.R or .Rmd --> .md --> .html). I guess there's something else we're
>   doing that causes ?URL encoding? of the image link. This is the pandoc
>   error I ultimately see at the conversion to html stage for the affected
>   image links:
>pandoc: Could not fetch fooabcdefghijklmnopqrstuvwxyz_files/figure-markdown_stri
>ct/unnamed-chunk-1-1.png%20%22fig:%22
>fooabcdefghijklmnopqrstuvwxyz_files/figure-markdown_strict/unnamed-chunk-1-1.png
> "fig:": openBinaryFile: does not exist (No such file or directory)
>Error: pandoc document conversion failed with error 67
>
>   On Friday, October 13, 2017 at 11:05:11 AM UTC-7, John MacFarlane
>   wrote:
>
>     +++ Jennifer Bryan [Oct 13 17 10:57 ]:
>     >   From my narrow view of the world, changing the CommonMark writer
>     to
>     >   match the rest here would be great!
>     Done.
>     >   In my real problem, the presence of this "fig:" makes image
>     links
>     >   vulnerable to breakage via the insertion of a hard line break at
>     the
>     >   space before "fig:". Therefore I have to also manipulate text
>     wrapping,
>     >   i.e. set --wrap=none or --wrap=preserve to protect the links.
>     I don't get that.  This is a perfectly valid image in
>     CommonMark:
>     ![](foo.png
>     "fig:")
>     >   On Friday, October 13, 2017 at 10:31:12 AM UTC-7, John
>     MacFarlane
>     >   wrote:
>     >
>     >     It's a kludge we use to distinguish images that should be
>     >     treated as figures.  You can turn off the extension
>     >     entirely using
>     >         -f markdown-implicit_figures
>     >     I can also change the CommonMark writer so that the "fig:"
>     >     prefix is removed, as it is in the other Markdown writers.
>     >     +++ Jennifer Bryan [Oct 13 17 09:44 ]:
>     >     >   Why does the title "fig:" get inserted into this image
>     link and,
>     >     more
>     >     >   importantly, how can I prevent that?
>     >     >   $ echo '![](foo.png)' | pandoc -f markdown -t commonmark
>     >     >   ![](foo.png "fig:")
>     >     >   It appears to be fairly specific to CommonMark, i.e. it's
>     not
>     >     there for
>     >     >   other flavours of markdown.
>     >     >   $ echo '![](foo.png)' | pandoc -f markdown -t
>     markdown_github
>     >     >   ![](foo.png)
>     >     >
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>     >   3. [13]https://groups.google.com/d/
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>     >   4. [14]http://40googlegroups.com/
>     >   5. [15]https://groups.google.com/d/optout
>     >   6. javascript:/
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>     >   8. [16]https://groups.google.com/d/
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>     >   9. [17]https://groups.google.com/d/optout
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>     >  12. [20]https://groups.google.com/d/
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>     >  13. [21]https://groups.google.com/d/optout
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>References
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>   1. https://groups.google.com/d/msgid/pandoc-discuss/
>   2. http://40googlegroups.com/
>   3. https://groups.google.com/
>   4. javascript:/
>   5. https://groups.google.com/d/msgid/pandoc-discuss/892c5a25-
>   6. http://086a-4e19-b4c1-8975cea8df0f-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org/?utm_medium=
>   7. https://groups.google.com/d/optout
>   8. javascript:/
>   9. javascript:/
>  10. https://groups.google.com/d/msgid/pandoc-discuss/3dcce503-9815-4a2d
>  11. http://40googlegroups.com/
>  12. https://groups.google.com/d/optout
>  13. https://groups.google.com/d/msgid/pandoc-discuss/892c5a25-086a-4e19-
>  14. http://40googlegroups.com/
>  15. https://groups.google.com/d/optout
>  16. https://groups.google.com/d/msgid/pandoc-discuss/892c5a25-086a-4e19-b4c1-8975cea8df0f-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org?utm_medium=email&utm_source=footer
>  17. https://groups.google.com/d/optout
>  18. javascript:/
>  19. javascript:/
>  20. https://groups.google.com/d/msgid/pandoc-discuss/3dcce503-9815-4a2d-aad9-b884f0e023aa-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org?utm_medium=email&utm_source=footer
>  21. https://groups.google.com/d/optout
>  22. mailto:pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>  23. mailto:pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>  24. https://groups.google.com/d/msgid/pandoc-discuss/d32e07da-beac-4710-b65e-7a02d9f76d43-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org?utm_medium=email&utm_source=footer
>  25. https://groups.google.com/d/optout