emojifont icons not rendered properly in rmarkdown

[IndrajeetPatil]

Trying to dig into the origin of this issue (yonicd/covrpage#22), I realized that the rmarkdown is not playing well with emojis.

This is what my .Rmd document looks like:

And this is what the rendered output looks like:

Of course, one option is to use Hadley's emo package (https://github.com/hadley/emo), which works just fine with rmarkdown and there is no such issue, but it's not on CRAN and so using it is not an option. emojifont, on the other hand, is on CRAN.

Here is my session info:

options(width = 200)
devtools::session_info()
#> - Session info ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
#>  setting  value                       
#>  version  R version 3.5.1 (2018-07-02)
#>  os       Windows 10 x64              
#>  system   x86_64, mingw32             
#>  ui       RTerm                       
#>  language (EN)                        
#>  collate  English_United States.1252  
#>  ctype    English_United States.1252  
#>  tz       America/New_York            
#>  date     2018-10-09                  
#> 
#> - Packages -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
#>  package     * version     date       lib source                            
#>  assertthat    0.2.0       2017-04-11 [1] CRAN (R 3.5.0)                    
#>  backports     1.1.2       2017-12-13 [1] CRAN (R 3.5.0)                    
#>  base64enc     0.1-3       2015-07-28 [1] CRAN (R 3.5.0)                    
#>  callr         3.0.0       2018-08-24 [1] CRAN (R 3.5.1)                    
#>  cli           1.0.1       2018-09-25 [1] CRAN (R 3.5.1)                    
#>  crayon        1.3.4       2018-09-26 [1] Github (r-lib/crayon@3e751fb)     
#>  debugme       1.1.0       2017-10-22 [1] CRAN (R 3.5.0)                    
#>  desc          1.2.0       2018-05-01 [1] CRAN (R 3.5.0)                    
#>  devtools      1.13.6.9000 2018-09-23 [1] Github (r-lib/devtools@74df201)   
#>  digest        0.6.17      2018-09-12 [1] CRAN (R 3.5.1)                    
#>  evaluate      0.11        2018-07-17 [1] CRAN (R 3.5.1)                    
#>  fs            1.2.6       2018-08-23 [1] CRAN (R 3.5.1)                    
#>  glue          1.3.0       2018-09-17 [1] Github (tidyverse/glue@4e74901)   
#>  htmldeps      0.1.1       2018-09-17 [1] Github (rstudio/htmldeps@c1023e0) 
#>  htmltools     0.3.6       2017-04-28 [1] CRAN (R 3.5.0)                    
#>  knitr         1.20.12     2018-08-13 [1] local                             
#>  magrittr      1.5         2014-11-22 [1] CRAN (R 3.5.0)                    
#>  memoise       1.1.0       2017-04-21 [1] CRAN (R 3.5.0)                    
#>  pkgbuild      1.0.1.9000  2018-10-01 [1] Github (r-lib/pkgbuild@446d70c)   
#>  pkgload       1.0.0       2018-09-17 [1] Github (r-lib/pkgload@7771d78)    
#>  prettyunits   1.0.2       2015-07-13 [1] CRAN (R 3.5.0)                    
#>  processx      3.2.0       2018-08-16 [1] CRAN (R 3.5.1)                    
#>  ps            1.1.0       2018-08-10 [1] CRAN (R 3.5.1)                    
#>  R6            2.3.0       2018-10-04 [1] CRAN (R 3.5.1)                    
#>  Rcpp          0.12.19     2018-10-01 [1] CRAN (R 3.5.1)                    
#>  remotes       1.1.1.9000  2018-09-23 [1] Github (r-lib/remotes@5a07ad2)    
#>  rlang         0.2.2       2018-08-16 [1] CRAN (R 3.5.1)                    
#>  rmarkdown     1.10.13     2018-09-17 [1] Github (rstudio/rmarkdown@df4ec91)
#>  rprojroot     1.3-2       2018-01-03 [1] CRAN (R 3.5.0)                    
#>  sessioninfo   1.1.0       2018-09-25 [1] CRAN (R 3.5.1)                    
#>  stringi       1.2.4       2018-07-20 [1] CRAN (R 3.5.1)                    
#>  stringr       1.3.1       2018-05-10 [1] CRAN (R 3.5.0)                    
#>  testthat      2.0.0       2017-12-13 [1] CRAN (R 3.5.0)                    
#>  usethis       1.4.0.9000  2018-09-23 [1] Github (r-lib/usethis@1e3c6a6)    
#>  withr         2.1.2       2018-03-15 [1] CRAN (R 3.5.0)                    
#>  xfun          0.3         2018-07-06 [1] CRAN (R 3.5.1)                    
#>  yaml          2.2.0       2018-07-25 [1] CRAN (R 3.5.1)                    
#> 
#> [1] C:/Users/inp099/Documents/R/win-library/3.5
#> [2] C:/Program Files/R/R-3.5.1/library

^{Created on 2018-10-09 by the reprex package (v0.2.1)}

[yonicd]

i'm getting similar output using emo

[yihui]

I recommend that you report this issue to the author of the emojifont package first. I can investigate it after he confirms emojifont is innocent and this is an issue of rmarkdown. Thanks!

And FYI GuangchuangYu/emojifont#19

[yonicd]

this wasn't only in emojifont, it also occurs with emo on windows

[yihui]

My guess is that this will ultimately lead to my $1024 question: r-lib/evaluate#59 (and the short answer is there is no solution to this problem, unless perhaps 30 years later Windows and R would fully embrace UTF-8).

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