argument is of length zero error in afm_scan_files

[deeenes]

Hi,

If I run font_import, after scanning all the directories, it fails with the following error:

Found FontName for 5044 fonts.
Scanning afm files in /usr/lib/R/library/extrafontdb/metrics
Error in if (grepl("Bold", weight)) { : argument is of length zero
In addition: There were 50 or more warnings (use warnings() to see the first 50)

The traceback:

5: FUN(X[[i]], ...)
4: lapply(afmfiles, afm_get_info)
3: afm_scan_files()
2: ttf_import(paths, recursive, pattern)
1: font_import()

In the /usr/lib/R/library/extrafontdb/metrics directory there are 4862 afm.gz files.
Also I can run font_import only as root, is it normal?

My session info:

─ Session info ──
 setting  value                       
 version  R version 4.0.2 (2020-06-22)
 os       Arch Linux                  
 system   x86_64, linux-gnu           
 ui       X11                         
 language (EN)                        
 collate  en_GB.UTF-8                 
 ctype    en_GB.UTF-8                 
 tz       Europe/Berlin           
 date     2020-08-31                  

─ Packages ──
 package     * version date       lib source        
 assertthat    0.2.1   2019-03-21 [1] CRAN (R 4.0.0)
 backports     1.1.7   2020-05-13 [1] CRAN (R 4.0.0)
 callr         3.4.3   2020-03-28 [1] CRAN (R 4.0.0)
 cli           2.0.2   2020-02-28 [1] CRAN (R 4.0.0)
 colorout    * 1.2-2   2020-05-19 [1] local         
 crayon        1.3.4   2017-09-16 [1] CRAN (R 4.0.0)
 curl          4.3     2019-12-02 [1] CRAN (R 4.0.0)
 desc          1.2.0   2018-05-01 [1] CRAN (R 4.0.0)
 devtools    * 2.3.0   2020-04-10 [1] CRAN (R 4.0.0)
 digest        0.6.25  2020-02-23 [1] CRAN (R 4.0.0)
 ellipsis      0.3.1   2020-05-15 [1] CRAN (R 4.0.0)
 extrafont   * 0.17    2014-12-08 [1] CRAN (R 4.0.0)
 extrafontdb   1.0     2012-06-11 [1] CRAN (R 4.0.0)
 fansi         0.4.1   2020-01-08 [1] CRAN (R 4.0.0)
 fs            1.4.1   2020-04-04 [1] CRAN (R 4.0.0)
 glue          1.4.1   2020-05-13 [1] CRAN (R 4.0.0)
 magrittr      1.5     2014-11-22 [1] CRAN (R 4.0.0)
 memoise       1.1.0   2017-04-21 [1] CRAN (R 4.0.0)
 pkgbuild      1.0.8   2020-05-07 [1] CRAN (R 4.0.0)
 pkgload       1.1.0   2020-05-29 [1] CRAN (R 4.0.0)
 prettyunits   1.1.1   2020-01-24 [1] CRAN (R 4.0.0)
 processx      3.4.2   2020-02-09 [1] CRAN (R 4.0.0)
 ps            1.3.3   2020-05-08 [1] CRAN (R 4.0.0)
 R6            2.4.1   2019-11-12 [1] CRAN (R 4.0.0)
 remotes       2.1.1   2020-02-15 [1] CRAN (R 4.0.0)
 rlang         0.4.6   2020-05-02 [1] CRAN (R 4.0.0)
 rprojroot     1.3-2   2018-01-03 [1] CRAN (R 4.0.0)
 Rttf2pt1      1.3.8   2020-01-10 [1] CRAN (R 4.0.0)
 sessioninfo   1.1.1   2018-11-05 [1] CRAN (R 4.0.0)
 testthat      2.3.2   2020-03-02 [1] CRAN (R 4.0.0)
 usethis     * 1.6.1   2020-04-29 [1] CRAN (R 4.0.0)
 withr         2.2.0   2020-04-20 [1] CRAN (R 4.0.0)

[1] /usr/lib/R/library

I appreciate any help with this.

Best wishes,

Denes