fmt_markdown() doesnt affect group cols

[joeycouse]

fmt_markdown() does not affect group cols when attempting to format with markdown.

library(gt)
suppressMessages(library(dplyr))

gtcars |> 
  mutate(group_col = paste0("<b>", ctry_origin, ' ', mfr, "</b>"),
         mfr = paste0("<b>",mfr,"</b>")) |> 
  head(10) |> 
  gt(groupname_col = "group_col",
    row_group_as_column = T) |> 
  fmt_markdown(columns = "group_col") |> 
  fmt_markdown(columns = "mfr")

	mfr	model	year	trim	bdy_style	hp	hp_rpm	trq	trq_rpm	mpg_c	mpg_h	drivetrain	trsmn	ctry_origin	msrp
<b>United States Ford</b>	Ford	GT	2017	Base Coupe	coupe	647	6250	550	5900	11	18	rwd	7a	United States	447000
<b>Italy Ferrari</b>	Ferrari	458 Speciale	2015	Base Coupe	coupe	597	9000	398	6000	13	17	rwd	7a	Italy	291744
	Ferrari	458 Spider	2015	Base	convertible	562	9000	398	6000	13	17	rwd	7a	Italy	263553
	Ferrari	458 Italia	2014	Base Coupe	coupe	562	9000	398	6000	13	17	rwd	7a	Italy	233509
	Ferrari	488 GTB	2016	Base Coupe	coupe	661	8000	561	3000	15	22	rwd	7a	Italy	245400
	Ferrari	California	2015	Base Convertible	convertible	553	7500	557	4750	16	23	rwd	7a	Italy	198973
	Ferrari	GTC4Lusso	2017	Base Coupe	coupe	680	8250	514	5750	12	17	awd	7a	Italy	298000
	Ferrari	FF	2015	Base Coupe	coupe	652	8000	504	6000	11	16	awd	7a	Italy	295000
	Ferrari	F12Berlinetta	2015	Base Coupe	coupe	731	8250	509	6000	11	16	rwd	7a	Italy	319995
	Ferrari	LaFerrari	2015	Base Coupe	coupe	949	9000	664	6750	12	16	rwd	7a	Italy	1416362

sessionInfo()
#> R version 4.3.2 (2023-10-31)
#> Platform: aarch64-apple-darwin20 (64-bit)
#> Running under: macOS Sonoma 14.2.1
#> 
#> Matrix products: default
#> BLAS:   /Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/lib/libRblas.0.dylib 
#> LAPACK: /Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/lib/libRlapack.dylib;  LAPACK version 3.11.0
#> 
#> locale:
#> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
#> 
#> time zone: America/Chicago
#> tzcode source: internal
#> 
#> attached base packages:
#> [1] stats     graphics  grDevices utils     datasets  methods   base     
#> 
#> other attached packages:
#> [1] dplyr_1.1.4 gt_0.10.1  
#> 
#> loaded via a namespace (and not attached):
#>  [1] vctrs_0.6.5       cli_3.6.2         knitr_1.45        rlang_1.1.2      
#>  [5] xfun_0.41         generics_0.1.3    glue_1.7.0        markdown_1.12    
#>  [9] htmltools_0.5.7   sass_0.4.8        fansi_1.0.6       rmarkdown_2.25   
#> [13] evaluate_0.23     tibble_3.2.1      fastmap_1.1.1     yaml_2.3.8       
#> [17] lifecycle_1.0.4   compiler_4.3.2    fs_1.6.3          pkgconfig_2.0.3  
#> [21] rstudioapi_0.15.0 digest_0.6.33     R6_2.5.1          reprex_2.0.2     
#> [25] tidyselect_1.2.0  utf8_1.2.4        pillar_1.9.0      commonmark_1.9.1 
#> [29] magrittr_2.0.3    tools_4.3.2       withr_2.5.2       xml2_1.3.6

^{Created on 2024-02-14 with reprex v2.0.2}

[olivroy]

A workaround for now is the following:

Basically, at render stage, the formats are not consulted when rendering row groups.

A workaround is to use process_md = TRUE in the gt() call:

library(gt)
suppressMessages(library(dplyr))

gtcars |> 
  mutate(group_col = paste0("<b>", ctry_origin, ' ', mfr, "</b>"),
         mfr = paste0("<b>",mfr,"</b>")) |> 
  head(10) |> 
  gt(groupname_col = "group_col", process_md = TRUE,
    row_group_as_column = T) 

Since formats are rendered at the last stage, it may require a larger change.

gt/R/dt_stub_df.R

Lines 120 to 137 in 10711c5

	if (process_md) {
	stub_df$group_label <-
	lapply(
	seq_along(row_group_labels),
	FUN = function(x) md(row_group_labels[x])
	)
	} else {
	stub_df[["group_label"]] <- as.list(row_group_labels)
	}
	data <- dt_boxhead_set_row_group(data = data, vars = groupname_col)
	}
	# Stop if input `data` has no columns (after modifying `data` for groups)
	if (ncol(data_tbl) == 0L) {
	cli::cli_abort(

Also, if you are looking to bold things, you may want to take a look at tab_options() / `tab_style().

The following should be more robust code:

gtcars |> 
  mutate(group_col = paste(ctry_origin, mfr)) |> 
  head(10) |> 
  gt(groupname_col = "group_col",
    row_group_as_column = T) |>
  tab_style(
      cell_text(weight = "bold"), 
      cells_body(columns = mfr)
  ) |>
  tab_options(row_group.font.westubight = "bold")

A more accurate title would be : formats don't affect group cols and row names (stub)