fix gen_contents_index also when no docs (#1813548)

- cronjob used to switch to /usr/share/doc/ghc/html/libraries
- since docs now subpackaged, need to check for no docs

- we could also recommend ghc-base-doc

ghc-gen_contents_index-nodocs.patch

@@ -0,0 +1,11 @@
+--- ghc-8.6.5/libraries/gen_contents_index~	2020-02-24 15:02:26.318866694 +0800
++++ ghc-8.6.5/libraries/gen_contents_index	2020-04-09 18:18:40.290722327 +0800
+@@ -47,6 +47,8 @@
+                 HADDOCK_ARGS="$HADDOCK_ARGS $HADDOCK_ARG"
+     done
+ else
++    if ! ls */*.haddock &>/dev/null; then exit 0; fi
++
+     HADDOCK=/usr/bin/haddock
+     # We don't want the GHC API to swamp the index
+     HADDOCK_FILES=`ls -1 */*.haddock | grep -v '/ghc\.haddock' | sort`

ghc.spec

@@ -49,7 +49,7 @@ Version: 8.6.5
 # - release can only be reset if *all* library versions get bumped simultaneously
 #   (sometimes after a major release)
 # - minor release numbers for a branch should be incremented monotonically
-Release: 102%{?dist}
+Release: 103%{?dist}
 Summary: Glasgow Haskell Compiler
 
 License: BSD and HaskellReport
@@ -64,6 +64,7 @@ Source7: runghc.man
 # absolute haddock path (was for html/libraries -> libraries)
 Patch1:  ghc-gen_contents_index-haddock-path.patch
 Patch2:  ghc-Cabal-install-PATH-warning.patch
+Patch3:  ghc-gen_contents_index-nodocs.patch
 # https://phabricator.haskell.org/rGHC4eebc8016f68719e1ccdf460754a97d1f4d6ef05
 Patch6: ghc-8.6.3-sphinx-1.8.patch
 
@@ -232,6 +233,7 @@ License: BSD
 Obsoletes: ghc-doc-cron < %{version}-%{release}
 Requires: ghc-compiler = %{version}-%{release}
 BuildArch: noarch
+#Recommends: ghc-base-doc = %{base_ver}-%{release}
 
 %description doc-index
 The package enables re-indexing of installed library documention.
@@ -322,6 +324,7 @@ packages to be automatically installed too.
 %setup -q -n %{name}-%{version} %{?with_testsuite:-b1}
 
 %patch1 -p1 -b .orig
+%patch3 -p1 -b .orig
 
 %patch2 -p1 -b .orig
 %patch6 -p1 -b .orig
@@ -574,11 +577,11 @@ make test
 
 %if %{with haddock}
 %transfiletriggerin doc-index -- %{ghc_html_libraries_dir}
-%{ghc_html_libraries_dir}/gen_contents_index
+env -C %{ghc_html_libraries_dir} ./gen_contents_index
 %end
 
 %transfiletriggerpostun doc-index -- %{ghc_html_libraries_dir}
-%{ghc_html_libraries_dir}/gen_contents_index
+env -C %{ghc_html_libraries_dir} ./gen_contents_index
 %end
 %endif
 
@@ -681,8 +684,8 @@ make test
 
 
 %changelog
-* Tue Mar 10 2020 Jens Petersen <petersen@redhat.com>
-- add bcond for dwarf info
+* Thu Apr  9 2020 Jens Petersen <petersen@redhat.com> - 8.6.5-103
+- fix running of gen_contents_index when no haddocks (#1813548)
 
 * Mon Feb 10 2020 Jens Petersen <petersen@redhat.com> - 8.6.5-102
 - rebuild against ghc-rpm-macros fixed for subpackage prof deps