`html-to-markdown.lua` error: attempt to call a nil value

[renkun-ken]

The html-to-markdown.lua introduced in #534 does not seem to work with R 4.2 under Ubuntu 20.04.

Error running filter 
/home/ken/R/x86_64-pc-linux-gnu-library/4.2/languageserver/lua/html-to-markdown.lua:
...-gnu-library/4.2/
languageserver/lua/html-to-markdown.lua:9: attempt to call a nil value (field 'to_simple_table')

stack traceback:
	...-gnu-library/4.2/
languageserver/lua/html-to-markdown.lua:9: in function 'Table'

> rmarkdown::pandoc_version()
[1] '2.5'

R version 4.2.0 (2022-04-22)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 20.04.4 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/liblapack.so.3

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8     LC_MONETARY=en_US.UTF-8   
 [6] LC_MESSAGES=en_US.UTF-8    LC_PAPER=en_US.UTF-8       LC_NAME=C                  LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] compiler_4.2.0 cli_3.3.0      jsonlite_1.8.0 rlang_1.0.2

[renkun-ken]

@atusy any idea?

[eitsupi]

REditorSupport/vscode-R#927 seems to be resolved in my environment on R 4.2.0 on Ubuntu 20.04, could it be due to the version of pandoc?

> rmarkdown::pandoc_version()
[1] ‘2.17.1.1’

> sessionInfo()
R version 4.2.0 (2022-04-22)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 20.04.4 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/liblapack.so.3

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=en_US.UTF-8       
 [4] LC_COLLATE=en_US.UTF-8     LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                  LC_ADDRESS=C              
[10] LC_TELEPHONE=C             LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
 [1] compiler_4.2.0  fastmap_1.1.0   cli_3.3.0       tools_4.2.0     htmltools_0.5.2 rmarkdown_2.14 
 [7] knitr_1.39      xfun_0.31       digest_0.6.29   jsonlite_1.8.0  rlang_1.0.2     evaluate_0.15

[renkun-ken]

My pandoc is installed from the ubuntu official repo. Maybe it is still too old for the lua script to run properly.

I installed the latest pandoc (2.18.1) and everything works well now. Maybe we should only run the lua script when pandoc is newer than a specific version?

[eitsupi]

It appears that the pandoc.utils.to_simple_table function was added in pandoc 2.11 by jgm/pandoc#6575.
So it would be a good idea to change it to run only on this version or later.

languageserver/inst/lua/html-to-markdown.lua

Line 9 in 528514d

local tb = pandoc.utils.to_simple_table(el)

[atusy]

Thank you for the inspections and the fix!