base64 encoding of CSS file not working in pandoc 1.14

[jjallaire]

I've noticed that when pandoc 1.14 attempts to base64 encode the bootstrap.min.css CSS file it doesn't work (whereas it did in pandoc 1.13). From a simple example (link to code of which is below) here is what I observe:

• In pandoc 1.13.2 the CSS file is fully inlined as base64 content and all boostrap styles are applied to the content (i.e. the background of the code blocks is shaded). The size of this file is 385.5 KB.
• In pandoc 1.14.1 it looks like only part of the CSS file is inlined (the size of the generated HTML file is 78.5 KB). Not surprisingly the bootstrap styles are not applied to the code blocks (there is no background shading).

Here's the code for the minimal reproducible example: https://github.com/jjallaire/pandoc-1.14-base64

[jgm]

Probably introduced in 1b44acf, when we replaced crufty CSS parsing heuristics with a real css parser (text-css).

Needs further investigation.

[jgm]

Sure enough, the problem seems to lie with css-text.
If you do parseNestedBlocks on the bootstrap.min.css file, and then renderNestedBlocks on the result, you get a much shorter text.
Opened issue yesodweb/css-text#6

[jjallaire]

I discovered another issue with the new CSS handling -- it fails when attempting to embed a font file that's referenced within the CSS. After modifying the original example to include a CSS file (flatly.min.css) that contains references to embedded TrueType fonts, I observe different results depending on whether I use pandoc 1.13.2 or pandoc 1.14.1:

• In pandoc 1.13.2 the conversion succeeds.

• In pandoc 1.14.0.1 the conversion fails with this error:

  pandoc: Could not fetch bootstrap/css/fonts/Lato.ttf) format('truetype
  bootstrap/css/fonts/Lato.ttf) format('truetype: openBinaryFile: does not exist
  (No such file or directory)
  

I've added this case to the repo that contains the reproducible example code: https://github.com/jjallaire/pandoc-1.14-base64

[Thell]

Closed rstudio/rmarkdown #454 as a dupe of this issue, and commenting here to subscribe.