new cabal_tweak_dep_ver macro for tweaking versions of depends

%cabal_tweak_dep_ver dep old new [backup]
changes old version bound to new for dep with optional backup suffix

eg %cabal_tweak_dep_ver haskell-src-exts 1.12 1.14 2

ghc-rpm-macros.ghc

@@ -18,6 +18,14 @@ proceeding, to avoid dependency ABI breakage from a future ghc rebuild."\
 %endif\
 fi
 
+# tweak depends versions
+# cabal_tweak_dep_ver dep old new [backup]
+%cabal_tweak_dep_ver()\
+if ! grep -q "%1[ >=].*%2"; then\
+   exit 1\
+fi\
+sed -i.%{?3}%{!?3:%1} -e "s/\(%1[ >=].*\)%2/\1%3/g" %{pkg_name}-%{version}/%{pkg_name}.cabal
+
 # configure
 %cabal_configure\
 %ghc_check_bootstrap\

ghc-rpm-macros.spec

@@ -3,7 +3,7 @@
 %global macros_file %{_sysconfdir}/rpm/macros.ghc
 
 Name:           ghc-rpm-macros
-Version:        0.95.3
+Version:        0.95.4
 Release:        1%{?dist}
 Summary:        Macros for building packages for GHC
 
@@ -60,6 +60,9 @@ EOF
 
 
 %changelog
+* Fri Jun 22 2012 Jens Petersen <petersen@redhat.com> - 0.95.4-1
+- add cabal_tweak_dep_ver macro to tweak a depend's version bound in .cabal
+
 * Sat Jun  9 2012 Jens Petersen <petersen@redhat.com> - 0.95.3-1
 - ghc-dep.sh: only use buildroot package.conf.d if it exists