add downloadable book version?

[apreshill]

Hey @njtierney,

Not that you need to-you could disable that option all together. But you can add an epub or pdf version to your .travis.yml like this example:

https://github.com/tidyverse/style/blob/e2d76307a7ec8feecb4b3da72501687b7f4ba770/.travis.yml#L17-L18

I would offer a PR but I don't know tic and am afraid of screwing up your build!

Alison

[njtierney]

Heya @apreshill 👋

Ah, the broken download link has been bothering me for a while! Thank you for this. Let's see how it goes.

😄

[njtierney]

well this failed in a way I was not expecting: https://travis-ci.org/njtierney/rmd4sci/builds/570664147#L1252

24.19s$ Rscript -e "bookdown::render_book('index.Rmd', 'bookdown::pdf_book', quiet = TRUE)"
!!! Error: Ghostscript exited with error code 127!
!!! Error: Ghostscript exited with error code 127!

Have you seen that error before?

Also, I used to use tic, but once you showed me your recipe for getting bookdown to publish via netlify it worked a charm, and I removed tic. https://github.com/njtierney/rmd4sci/search?q=tic&type=Code

[apreshill]

Blurg! No I haven't seen it, but a google search suggests (to me) that Ghostscript may be associated with the PDF output. When I tried to build the PDF book locally, I fail with this error:

tlmgr search --file --global '/Source Code Pro[.](tfm|afm|mf|otf)'
! Package fontspec Error: The font "Source Code Pro" cannot be found.

! kpathsea:make_tex: Invalid filename `Source Code Pro', contains ' '

Error: Failed to compile rmd4sci.tex. See https://yihui.name/tinytex/r/#debugging for debugging tips. See rmd4sci.log for more info.
In addition: Warning message:
In parse_packages(logfile, quiet = c(TRUE, FALSE, FALSE)) :
  Failed to find a package that contains Source Code Pro[.](tfm|afm|mf|otf)
Execution halted

Exited with status 1.

I would bet if you removed that build from your script it would work.

[njtierney]

Ah, thanks for tracing that issue down, @apreshill :)

Let's see how this one goes.

[njtierney]

OK so removing the PDF build fixed it 🎉

Next steps will be getting the PDF build working and the MOBI version as well.

[murraycadzow]

I just ran into the same issue as @apreshill plus a few other fonts seemed to be missing on my machine when building but found that this managed to solve it for me (on ubuntu)

mkdir ~/.fonts
git clone git://github.com/google/fonts.git ~/.fonts/google-fonts 
fc-cache -f

from https://gist.github.com/keeferrourke/d29bf364bd292c78cf774a5c37a791db#gistcomment-2716262

[yihui]

!!! Error: Ghostscript exited with error code 127!

@njtierney Here is the fix to this issue: rstudio/bookdown-demo@ae54659

[njtierney]

Thanks, @yihui - it works for EPUB now, but it looks like PDF causes some issues still: https://travis-ci.org/github/njtierney/rmd4sci/jobs/725481117#L4502

50% there though, thanks for your help, @yihui :)

[yihui]

The problem that you mentioned seems to be for EPUB instead of PDF.

[WARNING] Could not convert TeX math '
  Y \sim X\beta_0 + X\beta_1 + \epsilon \tag{1}
  ', rendering as TeX:
  
                     ^
  unexpected "{"
  expecting "%", "\\label", "\\nonumber" or whitespace
[1] "/home/travis/build/njtierney/rmd4sci/_book/rmd4sci.epub"

It was caused by \tag{}:

rmd4sci/caption-reference-eqn.Rmd

Lines 30 to 32 in ce9d405

	$$
	Y \sim X\beta_0 + X\beta_1 + \epsilon \tag{1}
	$$

I don't know why Pandoc doesn't support \tag{}. Perhaps you can drop this way of providing equation numbers, and only mention the first way.

[yihui]

You didn't seem to build PDF at all:

rmd4sci/.travis.yml

Line 24 in 1c734e2

# - Rscript -e "bookdown::render_book('index.Rmd', 'bookdown::pdf_book', quiet = TRUE)"

[njtierney]

Ack, sorry for that, @yihui, thanks for being a fresh pair of eyes. I'll more thoroughly read my travis build next time 🙂

[yihui]

To be able to build PDF, you have to either delete the font specifications (i.e. use default fonts):

rmd4sci/index.Rmd

Lines 13 to 14 in 059dd5a

	monofont: "Source Code Pro"
	monofontoptions: "Scale=0.7"

rmd4sci/latex/preamble.tex

Line 5 in 059dd5a

\setmainfont[UprightFeatures={SmallCapsFont=AlegreyaSC-Regular}]{Alegreya}

or actually install the fonts, e.g. follow @murraycadzow's tip above. Cloning and installing all Google Fonts sounds like an overkill to me, since you only need two of them. If I were you, I won't bother doing this.

The third option is to use fonts available on Ubuntu, and I believe there are many, but the downside is for people who do not use Ubuntu, they may not be able to build PDF by themselves. It depends on how much you really care about the typefaces in PDF.