Error in magick_image_readpath()...

[bstaton1]

Hello,

I'm very excited about this package, however I haven't been able to get it to work on my machine (see the bottom for the result of sessioninfo::session_info().

When I try running this example:

mtcars%>%
  head()%>%
  knitr::kable("latex")%>%
  tex_preview()

I get this error:

Error in magick_image_readpath(enc2native(path), density, depth, strip) : 
  Magick: PDFDelegateFailed `The system cannot find the file specified.
' @ error/pdf.c/ReadPDFImage/809

I get the same error regardless of what kind of TeX code I pass to tex_preview().

I have verified that I have all of the necessary latex packages:

texPreview:::tex_pkgs()

returns

 [1] "xcolor"   "booktabs" "multirow" "array"    "helvet"   "amsmath"  "rotating" "listings" "graphicx" "setspace" "caption" 

and

texPreview:::check_requirments()

returns

xcolor booktabs multirow    array   helvet  amsmath rotating listings graphicx setspace  caption 
    TRUE     TRUE     TRUE     TRUE     TRUE     TRUE     TRUE     TRUE     TRUE     TRUE     TRUE 

but with 11 warnings, all of the form (one for each package):

1: In system(cmd, intern = intern, wait = wait | intern,  ... :
  running command 'C:\windows\system32\cmd.exe /c mpm --list-package-names | grep xcolor' had status 255

(side note, I also get these warnings upon library(texPreview)).

I have also verified that pdflatex is in my PATH variable:

Sys.getenv("PATH")

returns (among other things):

C:\\Users\\bstaton\\AppData\\Roaming\\TinyTeX\\bin\\win32

which is where pdflatex.exe lives. I render .Rmd files to PDF using pdflatex all the time, so I suspect this isn't the issue.

Any suggestions on what could be causing this problem?

Thanks!

Session Info

- Session info ----------------------------------------------------------------------------------------------
 setting  value                       
 version  R version 3.6.0 (2019-04-26)
 os       Windows 10 x64              
 system   x86_64, mingw32             
 ui       RStudio                     
 language (EN)                        
 collate  English_United States.1252  
 ctype    English_United States.1252  
 tz       America/Los_Angeles         
 date     2020-01-08                  

- Packages --------------------------------------------------------------------------------------------------
 package     * version date       lib source        
 assertthat    0.2.1   2019-03-21 [1] CRAN (R 3.6.0)
 base64enc     0.1-3   2015-07-28 [1] CRAN (R 3.6.0)
 cli           2.0.1   2020-01-08 [1] CRAN (R 3.6.0)
 crayon        1.3.4   2017-09-16 [1] CRAN (R 3.6.0)
 digest        0.6.23  2019-11-23 [1] CRAN (R 3.6.1)
 fansi         0.4.0   2018-10-05 [1] CRAN (R 3.6.2)
 fs            1.3.1   2019-05-06 [1] CRAN (R 3.6.0)
 glue          1.3.1   2019-03-12 [1] CRAN (R 3.6.0)
 htmltools     0.4.0   2019-10-04 [1] CRAN (R 3.6.2)
 knitr       * 1.26    2019-11-12 [1] CRAN (R 3.6.1)
 lifecycle     0.1.0   2019-08-01 [1] CRAN (R 3.6.1)
 magick        2.2     2019-08-26 [1] CRAN (R 3.6.1)
 magrittr    * 1.5     2014-11-22 [1] CRAN (R 3.6.0)
 pillar        1.4.3   2019-12-20 [1] CRAN (R 3.6.2)
 pkgconfig     2.0.3   2019-09-22 [1] CRAN (R 3.6.1)
 Rcpp          1.0.3   2019-11-08 [1] CRAN (R 3.6.1)
 rematch2      2.1.0   2019-07-11 [1] CRAN (R 3.6.1)
 rlang         0.4.2   2019-11-23 [1] CRAN (R 3.6.0)
 rstudioapi    0.10    2019-03-19 [1] CRAN (R 3.6.0)
 sessioninfo   1.1.1   2018-11-05 [1] CRAN (R 3.6.0)
 svgPanZoom    0.3.3   2016-09-26 [1] CRAN (R 3.6.1)
 texPreview  * 1.4.3   2019-12-12 [1] CRAN (R 3.6.2)
 tibble        2.1.3   2019-06-06 [1] CRAN (R 3.6.0)
 whisker       0.4     2019-08-28 [1] CRAN (R 3.6.2)
 withr         2.1.2   2018-03-15 [1] CRAN (R 3.6.0)
 xfun          0.11    2019-11-12 [1] CRAN (R 3.6.2)
 xml2          1.2.2   2019-08-09 [1] CRAN (R 3.6.2)

[1] C:/Users/bstaton/Documents/R/R-3.6.0/library

[yonicd]

Thank you for trying out the package.

From the magick error it looks like the pdf is not being created in the expected path.

Can you please check if mpm is installed on your system.

I do not know if tinytex installs it by default.

Thank you

[yonicd]

This SO link may also be a good direction to try too.

It refers to error 809 in image magick.

The solution there was missing ghostscript.

https://stackoverflow.com/questions/32466112/imagemagick-convert-pdf-to-jpeg-failedtoexecutecommand-gswin32c-exe-pdfdel

[bstaton1]

Thank you for your response. Installing ghostscript was indeed the problem!

I suggest adding this to the system requirements for your package to run.

[yonicd]

Good to hear.

We will look into it if this is a magick/pdftools requirement or a tinytex minimal installation that did not install ghostscript on your system.

We will make a note of it in the readme depending on the case.

Closing this issue for now.

[yonicd]

ghostscript does not seem to be installed via tinytex on windows

https://github.com/yihui/tinytex/blob/8ab1244bcad3777470defa99a671bc925978d773/R/tlmgr.R#L104_L122

there is a related issue with ghostscript in tinytex issues that has more background on the subject

https://github.com/yihui/tinytex/issues/118