With setuptools it is possible to define optional sets of packages.
Sometimes packages may require a dependency with such extras. In that
case we could now add e.g. twisted.extras.tls to the
propagatedBuildInputs.
The latest release of libyamlcpp in nixpkgs does not build because it
uses an older version of boost than the one in nixpkgs and therefore
expects a particular header file which does not exist in the latest
boost anymore. For this reason, a later (git) version of libyamlcpp is
used here (which actually doesn't even require boost).
The substituteInPlace in the prePatch phase is needed because libevdev
places its headers in non-standard places, meaning Nix cannot normally
find them. The `cut` command removes the first two "-I" characters from
the output of `pkg-config`. This needs to be in the prePatch phase
because otherwise Nix will patch these lines to `/var/empty`, meaning
you would have less specific replacement (in case other lines are also
patched to `/var/empty`).
I wrote the patch. (I believe it is NixOS specific.)
Upstream changes:
* Tesseract 4.00.00alpha:
* Version parsing: Ignore suffix (so '4.00.00alpha' == (4, 0, 0))
* Libtesseract: Load libtesseract.so.4 instead of libtesseract.so.3
if available
* Support for Tesseract 3.05.00:
* Builders: Split field 'tess_conf' into 'tess_flags' and 'tess_conf'
* Libtesseract: If available, use
TessBaseAPIDetectOrientationScript() instead of
TessBaseAPIDetectOS
* Libtesseract:
* Workaround: Prevents possible segfault in image_to_string() when
the target language is not available
Full upstream change log can be found at:
https://github.com/openpaperwork/pyocr/blob/b006123d1d002711b9/ChangeLog
The tesseract.patch for supporting Tesseract version 3.05.00 has been
applied upstream and we can safely drop it.
We now use substituteInPlace in conjunction with a patch to insert the
relevant store paths instead of sed, so it's less fragile whenever we
have upstream changes in handling of these paths.
I've tested this by reverting 48a941e29f and applying a build
fix patch of Cuneiform 1.1.0 from Arch Linux, because right now
Cuneiform is an experimental version that can't be fixed on behalf of
pyocr (the reason is that pyocr needs to get a list of languages, which
doesn't work in that version anymore).
In addition to that I've successfully built paperwork-backend which by
now is the one package which depends on pyocr. However, I didn't do
runtime tests of Paperwork.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Cc: @7c6f434c
We already have a patch feeling lonely inside the python-modules
directory and to have everything at one place let's actually move pyocr
into its own dedicated directory so it's easier to patch it up (which
we're going to).
Right now, the package fails to build because of a few test failures, so
I haven't tested this apart from evaluating.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
