On Sat, Jan 12, 2019 at 12:19:54AM +0100, Marius Bakke wrote:
> Mathieu Othacehe <m.othacehe@gmail.com> writes:
> 
> > When trying to convert a PDF to EPUB, the following error occurs:
> >
> >   File "/gnu/store/kz6bgqw9z7akj11zh20wkx14cgq0s3n2-calibre-3.35.0/lib/calibre/calibre/ebooks/pdf/pdftohtml.py", line 76, in pdftohtml
> >     _('Could not find pdftohtml, check it is in your PATH'))
> >
> > Move poppler which provides pdftohtml from inputs to propagated-inputs to fix it.
> >
> > * gnu/packages/ebook.scm (calibre)[inputs]: Move poppler from here ...
> > [propagated-inputs]: ... to here.
> 
> An less intrusive solution would be to substitute the absolute path to
> 'pdf2html' in a build step.  I.e.:
> 
> (substitute* "lib/calibre/calibre/ebooks/pdf/pdftohtml.py"
>   (("PDFTOHTML = \"pdftohtml\"")
>    (string-append "PDFTOHTML = \"" (assoc-ref inputs "poppler")
>                   "/bin/pdftohtml\"")))
> 
> Either approach is fine by me, but please leave a comment about why
> Poppler is propagated if you go that route :-)

I think this substitution is the better solution.