view(), expr_deparse(), and native pipes

[dhicks]

view() has some sort of negative interaction with the new native pipe when the incoming expression is somewhat complicated and the title isn't explicitly specified. In the error case, the message is Error in View : invalid caption argument.

Poking around in the debugger, it seems like the problem is with expr_deparse() and the fact that the native pipe (unlike the magrittr pipe) is just syntactic sugar for nesting function calls. When the expression being piped into view() is long, expr_deparse() breaks it into multiple lines (I guess because it's intended for printing?), but then View() doesn't know what to do with a multi-line title. Using capital-V View(), the default title appears to be the whole incoming expression.

library(tibble)
library(dplyr)

## Works correctly
starwars |>
    view()
    
## Also works correctly
starwars |>
    mutate(height_m = height/100) |>
    view()

## Error in View : invalid caption argument
starwars |> 
    mutate(height_m = height/100) |> 
    mutate(mass_g = mass * 1000) |>  
    view()

## Error in View : invalid caption argument
starwars |> 
    mutate(height_m = height/100, 
           mass_g = mass * 1000) |>  
    view()

## Works correctly if the caption is explicit
starwars |> 
    mutate(height_m = height/100,
           mass_g = mass*1000) |> 
    view('converted')

─ Session info ────────────────────────────────────────────
 setting  value                       
 version  R version 4.1.0 (2021-05-18)
 os       macOS Big Sur 11.6          
 system   x86_64, darwin17.0          
 ui       RStudio                     
 language (EN)                        
 collate  en_US.UTF-8                 
 ctype    en_US.UTF-8                 
 tz       America/Los_Angeles         
 date     2021-10-10                  

─ Packages ────────────────────────────────────────────────
 package     * version date       lib source        
 assertthat    0.2.1   2019-03-21 [1] CRAN (R 4.1.0)
 bslib         0.3.0   2021-09-02 [1] CRAN (R 4.1.0)
 cachem        1.0.6   2021-08-19 [1] CRAN (R 4.1.0)
 callr         3.7.0   2021-04-20 [1] CRAN (R 4.1.0)
 cli           3.0.1   2021-07-17 [1] CRAN (R 4.1.0)
 clipr         0.7.1   2020-10-08 [1] CRAN (R 4.1.0)
 crayon        1.4.1   2021-02-08 [1] CRAN (R 4.1.0)
 DBI           1.1.1   2021-01-15 [1] CRAN (R 4.1.0)
 digest        0.6.27  2020-10-24 [1] CRAN (R 4.1.0)
 dplyr       * 1.0.7   2021-06-18 [1] CRAN (R 4.1.0)
 ellipsis      0.3.2   2021-04-29 [1] CRAN (R 4.1.0)
 evaluate      0.14    2019-05-28 [1] CRAN (R 4.1.0)
 fansi         0.5.0   2021-05-25 [1] CRAN (R 4.1.0)
 fastmap       1.1.0   2021-01-25 [1] CRAN (R 4.1.0)
 fs            1.5.0   2020-07-31 [1] CRAN (R 4.1.0)
 generics      0.1.0   2020-10-31 [1] CRAN (R 4.1.0)
 glue          1.4.2   2020-08-27 [1] CRAN (R 4.1.0)
 highr         0.9     2021-04-16 [1] CRAN (R 4.1.0)
 htmltools     0.5.2   2021-08-25 [1] CRAN (R 4.1.0)
 httpuv        1.6.3   2021-09-09 [1] CRAN (R 4.1.0)
 jquerylib     0.1.4   2021-04-26 [1] CRAN (R 4.1.0)
 jsonlite      1.7.2   2020-12-09 [1] CRAN (R 4.1.0)
 knitr         1.33    2021-04-24 [1] CRAN (R 4.1.0)
 later         1.3.0   2021-08-18 [1] CRAN (R 4.1.0)
 lifecycle     1.0.1   2021-09-24 [1] CRAN (R 4.1.0)
 magrittr      2.0.1   2020-11-17 [1] CRAN (R 4.1.0)
 mime          0.11    2021-06-23 [1] CRAN (R 4.1.0)
 miniUI        0.1.1.1 2018-05-18 [1] CRAN (R 4.1.0)
 pillar        1.6.3   2021-09-26 [1] CRAN (R 4.1.0)
 pkgconfig     2.0.3   2019-09-22 [1] CRAN (R 4.1.0)
 processx      3.5.2   2021-04-30 [1] CRAN (R 4.1.0)
 promises      1.2.0.1 2021-02-11 [1] CRAN (R 4.1.0)
 ps            1.6.0   2021-02-28 [1] CRAN (R 4.1.0)
 purrr         0.3.4   2020-04-17 [1] CRAN (R 4.1.0)
 R6            2.5.1   2021-08-19 [1] CRAN (R 4.1.0)
 Rcpp          1.0.7   2021-07-07 [1] CRAN (R 4.1.0)
 reprex        2.0.0   2021-04-02 [1] CRAN (R 4.1.0)
 rlang         0.4.11  2021-04-30 [1] CRAN (R 4.1.0)
 rmarkdown     2.9     2021-06-15 [1] CRAN (R 4.1.0)
 rstudioapi    0.13    2020-11-12 [1] CRAN (R 4.1.0)
 sass          0.4.0   2021-05-12 [1] CRAN (R 4.1.0)
 sessioninfo   1.1.1   2018-11-05 [1] CRAN (R 4.1.0)
 shiny       * 1.6.0   2021-01-25 [1] CRAN (R 4.1.0)
 tibble      * 3.1.5   2021-09-30 [1] CRAN (R 4.1.0)
 tidyselect    1.1.1   2021-04-30 [1] CRAN (R 4.1.0)
 utf8          1.2.2   2021-07-24 [1] CRAN (R 4.1.0)
 vctrs         0.3.8   2021-04-29 [1] CRAN (R 4.1.0)
 withr         2.4.2   2021-04-18 [1] CRAN (R 4.1.0)
 xfun          0.24    2021-06-15 [1] CRAN (R 4.1.0)
 xtable        1.8-4   2019-04-21 [1] CRAN (R 4.1.0)
 yaml          2.2.1   2020-02-01 [1] CRAN (R 4.1.0)

[1] /Library/Frameworks/R.framework/Versions/4.1/Resources/library

[krlmlr]

Thanks, I can't replicate it in RStudio 1.4.1717. What version of RStudio are you using?

[dhicks]

Hmm, I’m also on RStudio 1.4.1717. IIRC changing the width of the RStudio Console pane silently changes some width-related options. Perhaps expr_deparse() is using these options to figure out where to break expressions to separate lines? If so, then maybe making the Console pane more narrow will replicate the issue?

[krlmlr]

Indeed, changing options(width = ...) does the trick.

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