I am not sure but it seems to me that \GetFileInfo used for documentation of .dtx files ignores \ProvidesLanguage from the babel system. Why?

  • David's code seems to work; can you make an example that fails? – egreg Oct 10 '14 at 12:05

It does:

> \filedate=macro:
l.10 \show\filedate

> \fileversion=macro:
l.11 \show\fileversion

> \fileinfo=macro:
->English support from the babel system.
l.12 \show\fileinfo


generated from



  • Thank you. I found the reason. It was in russianb.ldf which had \ProviesLanguage{russian}[...]. With \ProvidesLanguage{russianb}[...] (note b at the end) \GetFileInfo works fine although I am not sure if other things in babel will not break. – Igor Kotelnikov Oct 10 '14 at 12:23
  • @IgorKotelnikov ah, strangely enough it wasn't the russian one I tested:-) Glad you got it working (you could query that with the maintainer of that file, to see if it should lose the b) – David Carlisle Oct 10 '14 at 13:29

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