[FR] internationalization - Customize figure names to set label after number

[tamas-ferenci]

(Already posted in Stackoverflow here to no avail.)

Bookdown allows the customization of chapter names, which is handy when a Hungarian project is built, as Chapter 1 is translated as 1. fejezet (i.e. the renaming of Chapter is not enough).

However, the very same is true for figure (and table) names as well, because Figure 1.1 should be translated as 1.1. ábra, but I don't know how to achieve this (_bookdown.yml doesn't seem to support something like "language/ui/figure_name" just as it does with chapter_name).

There is no problem with the PDF (LaTeX) output, because including \usepackage[magyar]{babel} in the preamble.tex solves this problem, but I don't know what to do with the non-PDF formats, where my only idea was to use the _bookdown.yml.

[cderv]

In the doc you linked to: https://bookdown.org/yihui/bookdown/internationalization.html it is explain with an example how to change a the figure label name, using the language and label key in the YAML

What is not working for you with this ?

[tamas-ferenci]

Because the translation of Figure should go after the number, not before it (as I have written: "Figure 1.1 should be translated as 1.1. ábra") and this is not possible with the possibilities listed in that doc, where I can only change the text, but I can't put it after the number in my understanding.

[cderv]

That is right, this is currently not possible to do that. Thanks for explaining.

It will always be <fig_lab>: <number> for now.

Out of curiosity, in which language do you label figure this way ?

[tamas-ferenci]

It's Hungarian. The reason why I hope for a possible new feature to support this is that the exact same thing is already working for chapter name! The cited doc even gives an example for this. The very same solution would be perfect for figure (and table) names.

[cderv]

You mean the use of a function taking chapter number as argument ? Is that what you use for chapter name ?

[tamas-ferenci]

Yes, Chapter 1 is translated as 1. fejezet. The solution is therefore simply:

language:
  ui:
    chapter_name: !expr function(i) paste0(i, ". fejezet")

A similar solution would be perfect for figure and table naming.

[yihui]

That sounds like a reasonable feature request to me.

[tamas-ferenci]

Thanks @yihui ! Together with #671 it'd make bookdown very nicely working for Hungarian as well :)

[cderv]

@tamas-ferenci you may try #1120

remotes::install_github("rstudio/bookdown#1120")

where this should work now

language:
  label:
    fig: !expr function(i) paste(i, 'ábra')
  ui:
    chapter_name: !expr function(i) paste0(i, '. fejezet')

[tamas-ferenci]

Thank you very much @cderv and @yihui ! I checked it, and it indeed seems to work fine! I only see two (very minor) problems:

• The documentation says fig: !expr function(i) paste(i, 'ábra') which is technically correct, but the Hungarian typography would imply fig: !expr function(i) paste0(i, '. ábra.').
• There is no space between the end of the text inserted and the first letter of the figure caption:
  
  That's not a huge problem as one could easily circumvent it with fig: !expr function(i) paste(i, '. ábra. '), but this was not needed for chapter_name (where even !expr function(i) paste0(i, '. fejezet') results in a space after fejezet and before the chapter name), so the two are not perfectly consistent right now.

[github-actions]

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