create bash-completion file in post-install

pandoc.spec

@@ -255,6 +255,13 @@ echo %{_bindir}/jira-wiki-markup >> %{jirawikimarkup}/ghc-jira-wiki-markup.files
 mv %{buildroot}%{_defaultlicensedir}/ghc-base-noprelude{,-devel}
 echo "%%license %{basenoprelude}/LICENSE" >> %{basenoprelude}/ghc-base-noprelude-devel.files
 
+mkdir -p %{buildroot}%{_datadir}/bash-completion/completions/
+touch %{buildroot}%{_datadir}/bash-completion/completions/%{name}
+
+
+%post
+%{_bindir}%{name} --bash-completion > %{_datadir}/bash-completion/completions/%{name}
+
 
 %files
 # Begin cabal-rpm files:
@@ -262,6 +269,7 @@ echo "%%license %{basenoprelude}/LICENSE" >> %{basenoprelude}/ghc-base-noprelude
 # End cabal-rpm files
 %{_bindir}/hsmarkdown
 %{_mandir}/man1/pandoc.1*
+%ghost %{_datadir}/bash-completion/completions/%{name}
 
 
 %files common
@@ -292,6 +300,9 @@ echo "%%license %{basenoprelude}/LICENSE" >> %{basenoprelude}/ghc-base-noprelude
 
 
 %changelog
+* Thu Aug  5 2021 Jens Petersen <petersen@redhat.com> - 2.9.2.1-10
+- create bash-completion file in post-install
+
 * Thu Jul 22 2021 Fedora Release Engineering <releng@fedoraproject.org> - 2.9.2.1-10
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild