# [tex4ht] Bold index entries

"Jürgen Hubert" jhubert at gmx.de
Wed May 8 06:22:46 CEST 2019

Sorry - I accidentally answered to Michael only when I found the solution. Here it is again, for the whole list:

As far as I can tell, the problem was that I was alternately generating PDF files with pdftex and epub files with the usual

tex4ebook -lm index -c myconfig.cfg -e mybuild.mk4 <filename>.tex

However, when compiling the epub file the compiler first attempts to read the existing *.ind index files (I have two, since I use two indices) before compiling them anew. And when attempting to read them, it comes across the

! Undefined control sequence.
l. 114	\item dragon, \hyperindexformat {\textbf}{15}, \hyperpage{15}

error - the .ind files generated by pdflatex and tex4ebook use different file formats. If you use them in the opposite order, pdflatex simply overwrites the tex4ebook files without any error messages.

So now that I know what to look for, I simply have to remember to delete the *.ind files before compiling the epub file.

Best regards,

- Jürgen

> Gesendet: Mittwoch, 08. Mai 2019 um 03:36 Uhr
> Von: "Karl Berry" <karl at freefriends.org>
> An: jhubert at gmx.de
> Cc: tex4ht at tug.org
> Betreff: Re: [tex4ht] Bold index entries
>
>     ! Undefined control sequence.
>     l. 114	\item dragon, \hyperindexformat {\textbf}{15}, \hyperpage{15}
>
> It's hard to guess what the undefined control sequence is from that,
> but as an ugly workaround, it seems like either
> \def\hyperindexformat{}
> or
> \def\hyperpage{}
> could at least get rid of the error without changing anything else.
>
> Also {\textbf}{15} doesn't look right. Unless the code somewhere has
> redefined \textbf (which I guess maybe it has), that gives an error:
> ! Argument of \textbf  has an extra }.
>
> It needs to be just \textbf{15} for normal LaTeX to apply.
>
> Just a couple of random thoughts :). --best, karl.
>