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(Pandoc?) warning about nonempty title element #156

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lorenzwalthert opened this issue Jan 7, 2018 · 19 comments
Closed

(Pandoc?) warning about nonempty title element #156

lorenzwalthert opened this issue Jan 7, 2018 · 19 comments

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@lorenzwalthert
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I get a strange (probably pandoc related) warning with the dev and CRAN version of reprex.

reprex::reprex({
  1+1
})
Rendering reprex...
[WARNING] This document format requires a nonempty <title> element.
  Please specify either 'title' or 'pagetitle' in the metadata.
  Falling back to 'file32c3f40d39b_reprex.utf8'
Rendered reprex is on the clipboard.
1+1
#> [1] 2

Created on 2018-01-07 by the reprex package (v0.1.1.9000).

I updated pandoc from 2.0.4 to 2.0.6 but it did not help. There seem to be similar warnings in other contexts (rstudio/rmarkdown#1200 and remotely related ramnathv/htmlwidgets#289). From the former issue, I thought I might be able to resolve the problem by using the development version of rmarkdown, which also did not help. Any ideas what's wrong here?

Session info

devtools::session_info()
#> Session info -------------------------------------------------------------
#>  setting  value                       
#>  version  R version 3.4.3 (2017-11-30)
#>  system   x86_64, darwin15.6.0        
#>  ui       X11                         
#>  language (EN)                        
#>  collate  en_US.UTF-8                 
#>  tz       Europe/Zurich               
#>  date     2018-01-07
#> Packages -----------------------------------------------------------------
#>  package   * version date       source        
#>  backports   1.1.2   2017-12-13 CRAN (R 3.4.3)
#>  base      * 3.4.3   2017-12-07 local         
#>  compiler    3.4.3   2017-12-07 local         
#>  datasets  * 3.4.3   2017-12-07 local         
#>  devtools    1.13.4  2017-11-09 CRAN (R 3.4.2)
#>  digest      0.6.13  2017-12-14 CRAN (R 3.4.3)
#>  evaluate    0.10.1  2017-06-24 CRAN (R 3.4.1)
#>  graphics  * 3.4.3   2017-12-07 local         
#>  grDevices * 3.4.3   2017-12-07 local         
#>  htmltools   0.3.6   2017-04-28 CRAN (R 3.4.0)
#>  knitr       1.18    2017-12-27 CRAN (R 3.4.3)
#>  magrittr    1.5     2014-11-22 CRAN (R 3.4.0)
#>  memoise     1.1.0   2017-04-21 CRAN (R 3.4.0)
#>  methods   * 3.4.3   2017-12-07 local         
#>  Rcpp        0.12.14 2017-11-23 CRAN (R 3.4.3)
#>  rmarkdown   1.8     2017-11-17 CRAN (R 3.4.2)
#>  rprojroot   1.3-2   2018-01-03 CRAN (R 3.4.3)
#>  stats     * 3.4.3   2017-12-07 local         
#>  stringi     1.1.6   2017-11-17 CRAN (R 3.4.2)
#>  stringr     1.2.0   2017-02-18 CRAN (R 3.4.0)
#>  tools       3.4.3   2017-12-07 local         
#>  utils     * 3.4.3   2017-12-07 local         
#>  withr       2.1.1   2017-12-19 CRAN (R 3.4.3)
#>  yaml        2.1.16  2017-12-12 CRAN (R 3.4.3)
@jennybc
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jennybc commented Jan 7, 2018

I do not immediately know what's going on here.

However it looks like the rmarkdown fix happened after the last CRAN release. If you install rmarkdown from GitHub, does that resolve it?

@lorenzwalthert
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Ok. Thanks. I also tried the devel version of rmarkdown and it did not help.

@jennybc
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jennybc commented Jan 7, 2018 •
edited

Is this specific to reprex or does it happen whenever you render .R or .Rmd to md_document or github_document and allow an html preview to happen?

@lorenzwalthert
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It seems specific to reprex.

@lorenzwalthert
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No in fact it also happens when I render to html_document, but not if I render to github_document or to md_document.

@lorenzwalthert
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Maybe the issue should be moved to knitr, rmarkdown?

@jennybc
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jennybc commented Jan 7, 2018

So it's the .md to .html step. If you include show = FALSE, it should go away. True?

Can you also test with both venue = "gh" and venue = "so"?

@lorenzwalthert
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Yes, for show = FALSE, it goes away.

@lorenzwalthert
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For venue = "gh"and show = TRUE, it's still there.

@lorenzwalthert
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Same for venue = "so".

@lorenzwalthert
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If I set show = FALSE, it's not there for venue = "gh" or venue = "so".

@lorenzwalthert
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On a related note, with venue = "so", I don't get the required blank line after <!-- language-all: lang-r -->, which was apparently fixed in #133 in general but does not work on my computer. With the CRAN version of reprex, I don't have this problem.

@jennybc
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jennybc commented Jan 12, 2018

Yeah I know that fix to the SO venue problem is not really done. #143 is my reminder. Will you tell me more about your system over there? Because I can't replicate the problem but sounds like you can!

@lorenzwalthert
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Sure. Maybe this helps? I wonder whether #133 is related to this issue (pandoc warning).

sessioninfo::session_info(c("reprex"))
#> ─ Session info ──────────────────────────────────────────────────────────
#>  setting  value                       
#>  version  R version 3.4.3 (2017-11-30)
#>  os       macOS Sierra 10.12.1        
#>  system   x86_64, darwin15.6.0        
#>  ui       X11                         
#>  language (EN)                        
#>  collate  en_US.UTF-8                 
#>  tz       Europe/Zurich               
#>  date     2018-01-12                  
#> 
#> ─ Packages ──────────────────────────────────────────────────────────────
#>  package    * version    date       source                           
#>  assertthat   0.2.0      2017-04-11 CRAN (R 3.4.0)                   
#>  backports    1.1.2      2017-12-13 CRAN (R 3.4.3)                   
#>  base64enc    0.1-3      2015-07-28 CRAN (R 3.4.0)                   
#>  callr        1.0.0.9000 2018-01-12 Github (r-lib/callr@550fa6b)     
#>  clipr        0.4.0      2017-11-03 CRAN (R 3.4.2)                   
#>  crayon       1.3.4      2017-09-16 CRAN (R 3.4.1)                   
#>  debugme      1.1.0      2017-10-22 CRAN (R 3.4.2)                   
#>  digest       0.6.13     2017-12-14 CRAN (R 3.4.3)                   
#>  evaluate     0.10.1     2017-06-24 CRAN (R 3.4.1)                   
#>  highr        0.6        2016-05-09 CRAN (R 3.4.0)                   
#>  htmltools    0.3.6      2017-04-28 CRAN (R 3.4.0)                   
#>  jsonlite     1.5        2017-06-01 CRAN (R 3.4.0)                   
#>  knitr        1.18       2017-12-27 CRAN (R 3.4.3)                   
#>  magrittr     1.5        2014-11-22 CRAN (R 3.4.0)                   
#>  markdown     0.8        2017-04-20 CRAN (R 3.4.0)                   
#>  mime         0.5        2016-07-07 CRAN (R 3.4.0)                   
#>  processx     2.0.0.1    2017-07-30 CRAN (R 3.4.1)                   
#>  R6           2.2.2      2017-06-17 CRAN (R 3.4.0)                   
#>  Rcpp         0.12.14    2017-11-23 CRAN (R 3.4.3)                   
#>  reprex       0.1.1.9000 2018-01-12 Github (tidyverse/reprex@9b07b0e)
#>  rlang        0.1.6      2017-12-21 CRAN (R 3.4.3)                   
#>  rmarkdown    1.8        2017-11-17 CRAN (R 3.4.2)                   
#>  rprojroot    1.3-2      2018-01-03 CRAN (R 3.4.3)                   
#>  stringi      1.1.6      2017-11-17 CRAN (R 3.4.2)                   
#>  stringr      1.2.0      2017-02-18 CRAN (R 3.4.0)                   
#>  whisker      0.3-2      2013-04-28 CRAN (R 3.4.0)                   
#>  withr        2.1.1      2017-12-19 CRAN (R 3.4.3)                   
#>  yaml         2.1.16     2017-12-12 CRAN (R 3.4.3)

Created on 2018-01-12 by the reprex package (v0.1.1.9000).

@alistaire47
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alistaire47 commented Jan 27, 2018 •
edited

I'm getting a similar effect on 0.1.1.9000 after updating my other packages (not sure which one caused it, sorry). The CRAN version, which is ahead of GitHub at 0.1.2, fails to read from the clipboard at all, which may or may not be related (edit: nm, saw #155).

@jennybc jennybc closed this as completed in dbaa2ef Feb 5, 2018
@jennybc
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jennybc commented Feb 5, 2018

@lorenzwalthert @alistaire47 Please let me know if, once you update, this is NOT fixed. I was able to reproduce it by upgrading Pandoc myself and this suppresses the warning for me locally and on AppVeyor.

@alistaire47
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Yep, the update (plus an R restart) fixes it!

@lorenzwalthert
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Yup, now it works without warnings. Thanks @jennybc 😊

@kmaheshkulkarni

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@jennybc @alistaire47 @lorenzwalthert @kmaheshkulkarni