#!/bin/sh -eux

# DESCRIPTION: unregister broken GHC packages.
# Run this a few times to resolve dependency rot in installed packages.
# ghc-pkg-clean -f cabal/dev/packages*.conf also works.
packages=$(ghc-pkg check $* 2>&1 |
	grep problems |
	awk '{print $6}' |
	sed -e 's/:$//'
 )
for p in $packages
 do
	echo unregistering $p
	ghc-pkg "$@" unregister $p
 done