default template does not work with multiple authors

[maxheld83]

(This is perhaps a regression to #353, same problem and reprex).

A minimal reproducible example, index.Rmd:

---
title: "R Markdown v2 Demo"
author:
  - John
  - Joe
date: "2015/01/01"
output:
  pdf_document:
    keep_tex: yes

---

Hello world.

Running rmarkdown::render('index.Rmd') on this fails with:

! Misplaced \crcr.
\endtabular ->\crcr 
                    \egroup \egroup $\egroup 
l.84 \maketitle

Error: Failed to compile index.tex. See https://yihui.name/tinytex/r/#debugging for debugging tips. See index.log for more info.
Execution halted

Running pandoc --standalone --from=markdown --output=index.pdf index.Rmd produces the expected pdf.

So I am guessing the problem is with the pandoc call or the pandoc latex template.

---

Reproduces with current dev and CRAN version.

devtools::session_info():

> devtools::session_info()
─ Session info ───────────────────────────────────────────────────────────────
 setting  value                       
 version  R version 3.6.1 (2019-07-05)
 os       macOS Catalina 10.15.1      
 system   x86_64, darwin15.6.0        
 ui       RStudio                     
 language (EN)                        
 collate  en_US.UTF-8                 
 ctype    en_US.UTF-8                 
 tz       Europe/Berlin               
 date     2019-12-02                  

─ Packages ───────────────────────────────────────────────────────────────────
 package     * version    date       lib source                            
 assertthat    0.2.1      2019-03-21 [1] CRAN (R 3.6.0)                    
 backports     1.1.5      2019-10-02 [1] CRAN (R 3.6.0)                    
 callr         3.3.2      2019-09-22 [1] CRAN (R 3.6.0)                    
 cli           1.1.0      2019-03-19 [1] CRAN (R 3.6.0)                    
 crayon        1.3.4      2017-09-16 [1] CRAN (R 3.6.0)                    
 desc          1.2.0      2018-05-01 [1] CRAN (R 3.6.0)                    
 devtools      2.2.1      2019-09-24 [1] CRAN (R 3.6.1)                    
 digest        0.6.23     2019-11-23 [1] CRAN (R 3.6.0)                    
 ellipsis      0.3.0      2019-09-20 [1] CRAN (R 3.6.0)                    
 evaluate      0.14       2019-05-28 [1] CRAN (R 3.6.0)                    
 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 3.6.0)                    
 knitr         1.26       2019-11-12 [1] CRAN (R 3.6.1)                    
 magrittr      1.5        2014-11-22 [1] CRAN (R 3.6.0)                    
 memoise       1.1.0      2017-04-21 [1] CRAN (R 3.6.0)                    
 packrat       0.5.0      2018-11-14 [1] CRAN (R 3.6.0)                    
 pkgbuild      1.0.6      2019-10-09 [1] CRAN (R 3.6.0)                    
 pkgload       1.0.2      2018-10-29 [1] CRAN (R 3.6.0)                    
 prettyunits   1.0.2      2015-07-13 [1] CRAN (R 3.6.0)                    
 processx      3.4.1      2019-07-18 [1] CRAN (R 3.6.0)                    
 ps            1.3.0      2018-12-21 [1] CRAN (R 3.6.0)                    
 R6            2.4.1      2019-11-12 [1] CRAN (R 3.6.1)                    
 Rcpp          1.0.3      2019-11-08 [1] CRAN (R 3.6.0)                    
 remotes       2.1.0      2019-06-24 [1] CRAN (R 3.6.0)                    
 rlang         0.4.2      2019-11-23 [1] CRAN (R 3.6.0)                    
 rmarkdown     1.18.2     2019-12-02 [1] Github (rstudio/rmarkdown@682ab7e)
 rprojroot     1.3-2      2018-01-03 [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)                    
 testthat      2.3.0      2019-11-05 [1] CRAN (R 3.6.0)                    
 usethis       1.5.1.9000 2019-08-22 [1] Github (jimhester/usethis@b25c982)
 withr         2.1.2      2018-03-15 [1] CRAN (R 3.6.0)                    
 xfun          0.11       2019-11-12 [1] CRAN (R 3.6.1)                    
 yaml          2.2.0      2018-07-25 [1] CRAN (R 3.6.0)                    

[1] /Library/Frameworks/R.framework/Versions/3.6/Resources/library

pandoc -v:

pandoc 2.8
Compiled with pandoc-types 1.20, texmath 0.12, skylighting 0.8.2.3
Default user data directory: /Users/max/.local/share/pandoc or /Users/max/.pandoc
Copyright (C) 2006-2019 John MacFarlane
Web:  http://pandoc.org
This is free software; see the source for copying conditions.
There is no warranty, not even for merchantability or fitness
for a particular purpose

[maxheld83]

As expected, running just the pandoc call on the reprex reproduces the problem (i.e. produces a bad index.tex), so it would appear to be an issue with either the pandoc call or the templates:

pandoc +RTS -K512m -RTS index.Rmd --to latex --from markdown+autolink_bare_uris+tex_math_single_backslash --output index.tex --self-contained --highlight-style tango --pdf-engine pdflatex --variable graphics --lua-filter /Library/Frameworks/R.framework/Versions/3.6/Resources/library/rmarkdown/rmd/lua/pagebreak.lua --lua-filter /Library/Frameworks/R.framework/Versions/3.6/Resources/library/rmarkdown/rmd/lua/latex-div.lua --variable 'geometry:margin=1in' --include-in-header /Library/Frameworks/R.framework/Versions/3.6/Resources/library/rmarkdown/rmd/latex/compact-title.tex 

Skipping --include-in-header /Library/Frameworks/R.framework/Versions/3.6/Resources/library/rmarkdown/rmd/latex/compact-title.tex solves the problem.
So perhaps the issue is with compact-title.tex.

[maxheld83]

downgrading remotes::install_github(repo = "rstudio/rmarkdown", ref = "v1.17") also solves the problem, so I am guessing this might be related to the changes regarding pandoc templates by @adunning in #1563 as per the 1.18 release notes.

[cderv]

Following a git bisect investigation using your reproducible example, I can confirm your guess that it comes from b2adfda, merging #1563

[cderv]

The change to now use default pandoc templat did bring back indeed the issue with \and in authors.
Default pandoc templates is

$if(author)$
\author{$for(author)$$author$$sep$ \and $endfor$}
$endif$

When using compact-title that brings the titling package, there seems to be a conflict as explained in #354 (comment)

deactivating the compact-title addition create no issue indeed. See with this example

---
title: "R Markdown v2 Demo"
author:
  - John
  - Joe
date: "2015/01/01"
output:
  pdf_document:
    keep_tex: yes
compact-title: false
---

Hello world.

old behavior was custom Rmarkdown template that use no \and for authors but \\

rmarkdown/inst/rmd/latex/default.tex

Line 170 in 00a4a45

\author{$for(author)$$author$$sep$ \\ $endfor$}

This indeed fix the issue with a quick test, putting authors one above the other

---
title: "R Markdown v2 Demo"
author:
  - John
  - Joe
date: "2015/01/01"
output:
  pdf_document:
    keep_tex: yes
    includes:
      in_header: header.tex
---

```{cat, engine.opts = list(file = "header.tex")}
\renewcommand{\and}{\\}
```

Hello world.

Hope this additional elements help fix this issue.

Note: I am using pandoc 2.7.3 here so I don't think this is 2.8 related.

[yihui]

I'm going to drop the compact-title option, and get rid of the hacks introduced in #252 and #354. As I was concerned originally (#354 (comment)), these hacks turned out not to be worth it, and they have made the LaTeX template fairly difficult to maintain.

[NoushinN]

Hi @yihui
I can compile some of my rmarkdowns and not others, the error reads as following, any tips?

`
This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019/W32TeX) (preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
name = fplmr, rootname = fplmr, pointsize =
mktexmf: empty or non-existent rootfile!

kpathsea: Running mktexmf fplmr.mf

Cannot find fplmr.mf.

kpathsea: Running mktextfm fplmr

The command name is C:\Users\nnabavi\AppData\Roaming\TinyTeX\bin\win32\mktextfm
kpathsea: Appending font creation commands to missfont.log.
tlmgr search --file --global "/fplmr."
Trying to automatically install missing LaTeX packages...
tlmgr install mathpazo

tlmgr itself needs to be updated.
Please do this via either
tlmgr update --self
or by getting the latest updater for Unix-ish systems:
http://mirror.ctan.org/systems/texlive/tlnet/update-tlmgr-latest.sh
and/or Windows systems:
http://mirror.ctan.org/systems/texlive/tlnet/update-tlmgr-latest.exe
Then continue with other updates as usual.

tlmgr.pl: Terminating; please see warning above!
tlmgr.pl: package repository http://muug.ca/mirror/ctan/systems/texlive/tlnet (not verified: gpg unavailable)
This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019/W32TeX) (preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
name = fplmr, rootname = fplmr, pointsize =
mktexmf: empty or non-existent rootfile!

kpathsea: Running mktexmf fplmr.mf

The command name is C:\Users\nnabavi\AppData\Roaming\TinyTeX\bin\win32\mktexmf
Cannot find fplmr.mf.

kpathsea: Running mktextfm fplmr

The command name is C:\Users\nnabavi\AppData\Roaming\TinyTeX\bin\win32\mktextfm
kpathsea: Appending font creation commands to missfont.log.
tlmgr search --file --global "/fplmr."
! Font \csname\endcsname=fplmr at 10.0pt not loadable: Metric (TFM) file not fo
und.
\AtBegShi@Output ...ipout \box \AtBeginShipoutBox
\fi \fi
l.204 \end{Shaded}

Error: Failed to compile 09_SSI_integration.tex. See https://yihui.name/tinytex/r/#debugging for debugging tips. See 09_SSI_integration.log for more info.
In addition: There were 17 warnings (use warnings() to see them)
Execution halted
`

[yihui]

@NoushinN Your issue is a different one. Please try remotes::install_github('yihui/tinytex').

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