With knitr 1.34 and bookdown 0.21 I get the following for gitbook - Error in get(name, envir = asNamespace(pkg), inherits = FALSE) : object 'is_abs_path' not found

[N0rbert]

I have just configured fresh Ubuntu MATE 20.04.3 LTS virtual machine. As usual I installed here R and RStudio.

As you may remember I need to have bookdown 0.21 to get my project compiled (because of rstudio/bookdown#1202 ). I installed bookdown 0.21 using the following command:

R -e "require(devtools); install_version('bookdown', version = '0.21', repos = 'http://cran.rstudio.com')"

Then I tried to compile my 2 year old project using it and it failed.
After some research I wrote minimal reproducible example index.Rmd file with following contents:

---
title: Test for Knitr 1.34
date: "`r Sys.Date()`"

documentclass: book

site: bookdown::bookdown_site
output:
  bookdown::gitbook: default

---

# Abstract {-#abstract}

This is simplest document to demonstrate the problem with modern Knitr 1.34.

If I click Knit button inside RStudio I get the following output on R Markdown tab:

Error in get(name, envir = asNamespace(pkg), inherits = FALSE) : 
  object 'is_abs_path' not found
Calls: <Anonymous> ... <Anonymous> -> <Anonymous> -> move_files_html -> ::: -> get
Please delete _main.Rmd after you finish debugging the error.
Execution halted

If I compile it using terminal inside RStudio by command rm _main.* ; Rscript -e "bookdown::render_book('index.Rmd', 'bookdown::gitbook')" I get relatively same result:

$ rm _main.* ; Rscript -e "bookdown::render_book('index.Rmd', 'bookdown::gitbook')"


processing file: _main.Rmd
  |......................................................................| 100%
   inline R code fragments


output file: _main.knit.md

/usr/lib/rstudio/bin/pandoc/pandoc +RTS -K512m -RTS _main.knit.md --to html4 --from markdown+autolink_bare_uris+tex_math_single_backslash --output _main.html --lua-filter /home/mate/R/x86_64-pc-linux-gnu-library/3.6/bookdown/rmarkdown/lua/custom-environment.lua --lua-filter /home/mate/R/x86_64-pc-linux-gnu-library/3.6/rmarkdown/rmarkdown/lua/pagebreak.lua --lua-filter /home/mate/R/x86_64-pc-linux-gnu-library/3.6/rmarkdown/rmarkdown/lua/latex-div.lua --wrap preserve --standalone --section-divs --table-of-contents --toc-depth 3 --template /home/mate/R/x86_64-pc-linux-gnu-library/3.6/bookdown/templates/gitbook.html --highlight-style pygments --number-sections --include-in-header /tmp/RtmpMmifgF/rmarkdown-str15f5c1bae1cf3.html --mathjax 
Error in get(name, envir = asNamespace(pkg), inherits = FALSE) : 
  object 'is_abs_path' not found
Calls: <Anonymous> ... <Anonymous> -> <Anonymous> -> move_files_html -> ::: -> get
Please delete _main.Rmd after you finish debugging the error.
Execution halted

The issue does not exist in previous Knitr 1.33, which was installed previously on my other system. I get the same document compiled successfully using it:

$ R -e "require(devtools); install_version('knitr', version = '1.33', repos = 'http://cran.rstudio.com')"
$ rm _main.* ; Rscript -e "bookdown::render_book('index.Rmd', 'bookdown::gitbook')"


processing file: _main.Rmd
  |......................................................................| 100%
   inline R code fragments


output file: _main.knit.md

/usr/lib/rstudio/bin/pandoc/pandoc +RTS -K512m -RTS _main.knit.md --to html4 --from markdown+autolink_bare_uris+tex_math_single_backslash --output _main.html --lua-filter /home/mate/R/x86_64-pc-linux-gnu-library/3.6/bookdown/rmarkdown/lua/custom-environment.lua --lua-filter /home/mate/R/x86_64-pc-linux-gnu-library/3.6/rmarkdown/rmarkdown/lua/pagebreak.lua --lua-filter /home/mate/R/x86_64-pc-linux-gnu-library/3.6/rmarkdown/rmarkdown/lua/latex-div.lua --wrap preserve --standalone --section-divs --table-of-contents --toc-depth 3 --template /home/mate/R/x86_64-pc-linux-gnu-library/3.6/bookdown/templates/gitbook.html --highlight-style pygments --number-sections --include-in-header /tmp/RtmpxUMxyi/rmarkdown-str15fce25e23e09.html --mathjax 

Output created: _book/index.html
[1] "/home/mate/Downloads/bookdown-demo-rus/_book/index.html"

Please have a fallback for is_abs_path on knitr side.

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> xfun::session_info('knitr')
R version 3.6.3 (2020-02-29)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 20.04.3 LTS, RStudio 1.4.1717

Locale:
  LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=ru_RU.UTF-8       
  LC_COLLATE=en_US.UTF-8     LC_MONETARY=ru_RU.UTF-8    LC_MESSAGES=en_US.UTF-8   
  LC_PAPER=ru_RU.UTF-8       LC_NAME=C                  LC_ADDRESS=C              
  LC_TELEPHONE=C             LC_MEASUREMENT=ru_RU.UTF-8 LC_IDENTIFICATION=C       

Package version:
  evaluate_0.14   glue_1.4.2      graphics_3.6.3  grDevices_3.6.3 highr_0.9      
  knitr_1.34      magrittr_2.0.1  methods_3.6.3   stats_3.6.3     stringi_1.7.4  
  stringr_1.4.0   tools_3.6.3     utils_3.6.3     xfun_0.25       yaml_2.2.1     
> 

> xfun::session_info('bookdown')
R version 3.6.3 (2020-02-29)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 20.04.3 LTS, RStudio 1.4.1717

Locale:
  LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=ru_RU.UTF-8       
  LC_COLLATE=en_US.UTF-8     LC_MONETARY=ru_RU.UTF-8    LC_MESSAGES=en_US.UTF-8   
  LC_PAPER=ru_RU.UTF-8       LC_NAME=C                  LC_ADDRESS=C              
  LC_TELEPHONE=C             LC_MEASUREMENT=ru_RU.UTF-8 LC_IDENTIFICATION=C       

Package version:
  base64enc_0.1.3 bookdown_0.21   digest_0.6.27   evaluate_0.14   fastmap_1.1.0   glue_1.4.2     
  graphics_3.6.3  grDevices_3.6.3 highr_0.9       htmltools_0.5.2 jsonlite_1.7.2  knitr_1.34     
  magrittr_2.0.1  methods_3.6.3   rlang_0.4.11    rmarkdown_2.10  stats_3.6.3     stringi_1.7.4  
  stringr_1.4.0   tinytex_0.33    tools_3.6.3     utils_3.6.3     xfun_0.25       yaml_2.2.1     
> 

[yihui]

This is_abs_path() function has been removed in knitr 1.34: https://github.com/yihui/knitr/releases/tag/v1.34

If you want to use an older version of bookdown, I'm afraid you have to use an older version of knitr accordingly.

[N0rbert]

Thanks!
I have already decided to use older versions for both applications. Really I do not want to make my Rmd environment full of hacks and version locks.
I still hope that you revert is_abs_path removal for better compatibility.

[yihui]

Thanks for your patience! We'll fix rstudio/bookdown#1202.

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