[bug#54396] [PATCH v2] [WIP] gnu: python-notmuch2: Fix build.

[Liliana Marie Prikler <liliana.prikler@ist.tugraz.at>]

Hi Tanguy,

Am Mittwoch, dem 16.03.2022 um 17:48 +0100 schrieb Tanguy LE CARROUR:
> > That is actually a mistake on my part, search-input-file should
> > search inputs for "include/notmuch.h" and likewise
> > "lib/libnotmuch.so". 
> > The dirname is important here, since both constants want
> > directories. 
> > Alternatively, forgoing those constants might be a good idea, but
> > is not worth investing too much time in.
> 
> So, I'm leaving those as they are for now.
I think you misunderstood me.  It is absolutely necessary that you
instantiate these variables correctly.  It is not necessary to
substitute* their uses.

> > > If I set `NOTMUCH_VERSION_FILE=''`, I get a "file does not exist"
> > > error at build time. So I decided to set it to `/dev/null`
> > > instead.
> > > Or would it be better if I patched `notmuch` to create the actual
> > > version file?!
> > I think you ought to debug the build and short-circuit the logic by
> > inferring the version number directly where it is needed.  Without
> > actual build output that's as much as I can propose.
> 
> Mmm… I've added a new phase to patch the `setup.py`, but couldn't get
> the version variable to work. Sorry for my… noobiness!? ^_^'
> 
> ```
> ;; version.txt is not included in notmuch, so we patch in the version
> number
> (add-after 'create-notmuch-config 'patch-setup.py
>   (lambda _
>     (substitute* "setup.py"
>       (("with open\\(NOTMUCH_VERSION_FILE\\) as fp:") "")
>       (("    VERSION = fp.read\\(\\).strip\\(\\)") "")
>       (("version=VERSION,") (string-append "version='" "0.0.0"
> "',")))))
> ```
> 
> I've tried to replace `0.0.0` with `version` or `,version` but that
> doesn't seem to be the proper way to do it.
substitute* is not nice when dealing with multi-line expressions.  I
think you could replace NOTMUCH_VERSION_FILE with '/dev/null' and
"VERSION = .*" with (string-append "VERSION = " #$version).

Cheers