Warning: one argument not used by format '=?utf-8?B?%s?='

[chuxinyuan]

https://github.com/rstudio/blastula/blob/e9bd2675cc8c43dd03d54db0981cf3444747e2b5/R/mime.R#L514

Example

str = "mail"
str <- sprintf("=?utf-8?B?%s?=", base64enc::base64encode(charToRaw(str)), 0)
#> Warning in sprintf("=?utf-8?B?%s?=", base64enc::base64encode(charToRaw(str)), :
#> one argument not used by format '=?utf-8?B?%s?='

^{Created on 2023-10-26 with reprex v2.0.2}

System info

sessionInfo()
#> R version 4.3.1 (2023-06-16)
#> Platform: x86_64-pc-linux-gnu (64-bit)
#> Running under: Manjaro Linux
#> 
#> Matrix products: default
#> BLAS:   /usr/lib/libblas.so.3.11.0 
#> LAPACK: /usr/lib/liblapack.so.3.11.0
#> 
#> locale:
#>  [1] LC_CTYPE=zh_CN.UTF-8       LC_NUMERIC=C              
#>  [3] LC_TIME=zh_CN.UTF-8        LC_COLLATE=zh_CN.UTF-8    
#>  [5] LC_MONETARY=zh_CN.UTF-8    LC_MESSAGES=zh_CN.UTF-8   
#>  [7] LC_PAPER=zh_CN.UTF-8       LC_NAME=C                 
#>  [9] LC_ADDRESS=C               LC_TELEPHONE=C            
#> [11] LC_MEASUREMENT=zh_CN.UTF-8 LC_IDENTIFICATION=C       
#> 
#> time zone: Asia/Shanghai
#> tzcode source: system (glibc)
#> 
#> attached base packages:
#> [1] stats     graphics  grDevices utils     datasets  methods   base     
#> 
#> loaded via a namespace (and not attached):
#>  [1] styler_1.10.2     digest_0.6.33     fastmap_1.1.1     xfun_0.40        
#>  [5] magrittr_2.0.3    glue_1.6.2        R.utils_2.12.2    knitr_1.44       
#>  [9] htmltools_0.5.6.1 rmarkdown_2.25    lifecycle_1.0.3   cli_3.6.1        
#> [13] R.methodsS3_1.8.2 vctrs_0.6.4       reprex_2.0.2      withr_2.5.1      
#> [17] compiler_4.3.1    R.oo_1.25.0       R.cache_0.16.0    purrr_1.0.2      
#> [21] rstudioapi_0.15.0 tools_4.3.1       evaluate_0.22     yaml_2.3.7       
#> [25] rlang_1.1.1       fs_1.6.3

^{Created on 2023-10-26 with reprex v2.0.2}