%pyproject_buildrequires -x now implies -r

The usage without -r errored anyway, this way instead of forcing the user to add it,
we do it ourselves.

Machines stealing human's labor, yet again.

README.md

@@ -55,7 +55,7 @@ For example, if upstream suggests installing test dependencies with
 `pip install mypackage[testing]`, the test deps would be generated by:
 
     %generate_buildrequires
-    %pyproject_buildrequires -r -x testing
+    %pyproject_buildrequires -x testing
 
 For projects that specify test requirements in their [tox] configuration,
 these can be added using the `-t` flag (default tox environment)
@@ -79,11 +79,11 @@ Or specify more environments if needed:
 The `-e` option redefines `%{toxenv}` for further reuse.
 Use `%{default_toxenv}` to get the default value.
 
-Note that `-t` implies `-r`, because tox normally assumes the package is installed
-including all the runtime dependencies.
-
 The `-t`/`-e` option uses [tox-current-env]'s `--print-deps-to-file` behind the scenes.
 
+Note that both `-x` and `-t` imply `-r`,
+because runtime dependencies are always required for testing.
+
 [tox]: https://tox.readthedocs.io/
 [tox-current-env]: https://github.com/fedora-python/tox-current-env/
 

pyproject-rpm-macros.spec

@@ -6,7 +6,7 @@ License:        MIT
 
 # Keep the version at zero and increment only release
 Version:        0
-Release:        17%{?dist}
+Release:        18%{?dist}
 
 # Macro files
 Source001:      macros.pyproject
@@ -101,6 +101,10 @@ export HOSTNAME="rpmbuild"  # to speedup tox in network-less mock, see rhbz#1856
 %license LICENSE
 
 %changelog
+* Thu Jul 16 2020 Miro Hrončok <mhroncok@redhat.com> - 0-18
+- %%pyproject_buildrequires -x (extras requires for tests) now implies -r
+  (runtime requires) instead of erroring without it for better UX.
+
 * Wed Jul 15 2020 Miro Hrončok <mhroncok@redhat.com> - 0-17
 - Set HOSTNAME to prevent tox 3.17+ from a DNS query
 - Fixes rhbz#1856356

pyproject_buildrequires.py

@@ -279,7 +279,8 @@ def main(argv):
     )
     parser.add_argument(
         '-x', '--extras', metavar='EXTRAS', default='',
-        help='extra for runtime requirements (e.g. -x testing)',
+        help='extra for runtime requirements (e.g. -x testing) '
+             '(implies --runtime)',
         # XXX: a comma-separated list should be possible here
         # help='comma separated list of "extras" for runtime requirements '
         #    + '(e.g. -x testing,feature-x)',
@@ -295,9 +296,8 @@ def main(argv):
         args.toxenv = (args.toxenv or os.getenv('RPM_TOXENV') or
                        f'py{sys.version_info.major}{sys.version_info.minor}')
 
-    if args.extras and not args.runtime:
-        print_err('-x (--extras) are only useful with -r (--runtime)')
-        exit(1)
+    if args.extras:
+        args.runtime = True
 
     try:
         generate_requires(