Recommend python3-tkinter when tk is installed

The tkinter module is part of the Python's standard library, however it is in
a separate subpackage to save an unwanted dependency on tk.

When tk is installed, we recommend the subpackage to provide more upstream-like
experience, but still provide a way out.

python3.spec

@@ -17,7 +17,7 @@ URL: https://www.python.org/
 #global prerel ...
 %global upstream_version %{general_version}%{?prerel}
 Version: %{general_version}%{?prerel:~%{prerel}}
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: Python
 
 
@@ -30,12 +30,21 @@ License: Python
 
 
 # Flat package, i.e. python36, python37, python38 for tox etc.
-# warning: changes some other defaults
+# WARNING: This also influences the main_python bcond below.
 # in Fedora, never turn this on for the python3 package
 # and always keep it on for python37 etc.
-# WARNING: This does not change the package name and summary above
+# WARNING: This does not change the package name and summary above.
 %bcond_with flatpackage
 
+# Main Python, i.e. whether this is the main Python version in the distribution
+# that owns /usr/bin/python3 and other unique paths
+# Default: if this is a flatpackage -> it is not the main Python
+%if %{with flatpackage}
+%bcond_with main_python
+%else
+%bcond_without main_python
+%endif
+
 # When bootstrapping python3, we need to build setuptools.
 # but setuptools BR python3-devel and that brings in python3-rpm-generators;
 # python3-rpm-generators needs python3-setuptools, so we cannot have it yet.
@@ -311,12 +320,14 @@ Provides: python%{pyshortver} = %{version}-%{release}
 # replace python36-3.6.2.
 Obsoletes: python%{pyshortver}
 
+%if %{with main_python}
 # https://fedoraproject.org/wiki/Changes/Move_usr_bin_python_into_separate_package
 # https://fedoraproject.org/wiki/Changes/Python_means_Python3
 # We recommend /usr/bin/python so users get it by default
 # Versioned recommends are problematic, and we know that the package requires
 # python3 back with fixed version, so we just use the path here:
 Recommends: %{_bindir}/python
+%endif
 
 # In Fedora 31, /usr/bin/pydoc was moved here from Python 2.
 # Ideally we'd have an explicit conflict with "/usr/bin/pydoc < 3",
@@ -358,6 +369,7 @@ Packages containing additional libraries for Python are generally named with
 the "%{name}-" prefix.
 
 
+%if %{with main_python}
 # https://fedoraproject.org/wiki/Changes/Move_usr_bin_python_into_separate_package
 # https://fedoraproject.org/wiki/Changes/Python_means_Python3
 %package -n python-unversioned-command
@@ -373,6 +385,8 @@ Provides: python = %{version}-%{release}
 %description -n python-unversioned-command
 This package contains /usr/bin/python - the "python" command that runs Python 3.
 
+%endif # with main_python
+
 
 %package libs
 Summary:        Python runtime libraries
@@ -393,6 +407,11 @@ Provides: bundled(python3-setuptools) = 41.2.0
 # See https://bugzilla.redhat.com/show_bug.cgi?id=1547131
 Recommends: %{name}%{?_isa} = %{version}-%{release}
 
+# tkinter is part of the standard library,
+# but it is torn out to save an unwanted dependency on tk and X11.
+# we recommend it when tk is already installed (for better UX)
+Recommends: (%{name}-tkinter%{?_isa} = %{version}-%{release} if tk%{?_isa})
+
 # https://fedoraproject.org/wiki/Changes/Move_usr_bin_python_into_separate_package
 # In Fedora 31, several "unversioned" files like /usr/bin/pydoc and all the
 # "unversioned" provides were moved from python2 to python3.
@@ -842,7 +861,7 @@ install -d -m 0755 %{buildroot}%{pylibdir}/site-packages/__pycache__
 install -d -m 0755 %{buildroot}%{_prefix}/lib/python%{pybasever}/site-packages/__pycache__
 %endif
 
-%if %{without flatpackage}
+%if %{with main_python}
 # add idle3 to menu
 install -D -m 0644 Lib/idlelib/Icons/idle_16.png %{buildroot}%{_datadir}/icons/hicolor/16x16/apps/idle3.png
 install -D -m 0644 Lib/idlelib/Icons/idle_32.png %{buildroot}%{_datadir}/icons/hicolor/32x32/apps/idle3.png
@@ -925,7 +944,7 @@ find %{buildroot} -perm 555 -exec chmod 755 {} \;
 # Create "/usr/bin/python3-debug", a symlink to the python3 debug binary, to
 # avoid the user having to know the precise version and ABI flags.
 # See e.g. https://bugzilla.redhat.com/show_bug.cgi?id=676748
-%if %{with debug_build} && %{without flatpackage}
+%if %{with debug_build} && %{with main_python}
 ln -s \
   %{_bindir}/python%{LDVERSION_debug} \
   %{buildroot}%{_bindir}/python3-debug
@@ -936,7 +955,7 @@ ln -s \
 # See https://bugzilla.redhat.com/show_bug.cgi?id=1111275
 mv %{buildroot}%{_bindir}/2to3-%{pybasever} %{buildroot}%{_bindir}/2to3
 
-%if %{with flatpackage}
+%if %{without main_python}
 # Remove stuff that would conflict with python3 package
 rm %{buildroot}%{_bindir}/python3
 rm %{buildroot}%{_bindir}/pydoc3
@@ -1056,7 +1075,7 @@ CheckPython optimized
 %files
 %doc README.rst
 
-%if %{without flatpackage}
+%if %{with main_python}
 %{_bindir}/pydoc*
 %{_bindir}/python3
 %else
@@ -1068,11 +1087,15 @@ CheckPython optimized
 %{_mandir}/*/*3*
 
 
+%if %{with main_python}
 %if %{without flatpackage}
 %files -n python-unversioned-command
+%endif
 %{_bindir}/python
 %{_mandir}/*/python.1*
+%endif
 
+%if %{without flatpackage}
 %files libs
 %doc README.rst
 %endif
@@ -1286,13 +1309,16 @@ CheckPython optimized
 %{_includedir}/python%{LDVERSION_optimized}/%{_pyconfig_h}
 
 %{_libdir}/%{py_INSTSONAME_optimized}
-%if %{without flatpackage}
+%if %{with main_python}
 %{_libdir}/libpython3.so
 %endif
 
 
 %if %{without flatpackage}
 %files devel
+%endif
+
+%if %{with main_python}
 %{_bindir}/2to3
 %endif
 
@@ -1306,7 +1332,7 @@ CheckPython optimized
 %{_includedir}/python%{LDVERSION_optimized}/cpython/
 %doc Misc/README.valgrind Misc/valgrind-python.supp Misc/gdbinit
 
-%if %{without flatpackage}
+%if %{with main_python}
 %{_bindir}/python3-config
 %{_bindir}/python-config
 %{_libdir}/pkgconfig/python3.pc
@@ -1334,7 +1360,9 @@ CheckPython optimized
 
 %if %{without flatpackage}
 %files idle
+%endif
 
+%if %{with main_python}
 %{_bindir}/idle*
 %else
 %{_bindir}/idle%{pybasever}
@@ -1342,7 +1370,7 @@ CheckPython optimized
 
 %{pylibdir}/idlelib
 
-%if %{without flatpackage}
+%if %{with main_python}
 %{_metainfodir}/idle3.appdata.xml
 %{_datadir}/applications/idle3.desktop
 %{_datadir}/icons/hicolor/*/apps/idle3.*
@@ -1394,6 +1422,9 @@ CheckPython optimized
 %if %{with debug_build}
 %if %{without flatpackage}
 %files debug
+%endif
+
+%if %{with main_python}
 %{_bindir}/python3-debug
 %{_bindir}/python-debug
 %endif
@@ -1529,6 +1560,9 @@ CheckPython optimized
 # ======================================================
 
 %changelog
+* Thu Nov 28 2019 Miro Hrončok <mhroncok@redhat.com> - 3.8.0-2
+- Recommend python3-tkinter when tk is installed
+
 * Mon Oct 14 2019 Miro Hrončok <mhroncok@redhat.com> - 3.8.0-1
 - Update to Python 3.8.0 final