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@alexanderkjeldaas
Last active December 19, 2015 23:59
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Safer cabal --upgrade-dependencies. Easy detection of non-optimal upper bounds. Unregister broken packages with ghc. Reset ghc pkg db.
# 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.
function ghc-pkg-clean() {
for p in `ghc-pkg check $* 2>&1 | grep problems | awk '{print $6}' | sed -e 's/:$//'`
do
echo unregistering $p; ghc-pkg $* unregister $p
done
}
# remove all installed GHC/cabal packages, leaving ~/.cabal binaries
# and docs in place. When all else fails, use this to get out of
# dependency hell and start over.
function ghc-pkg-reset() {
read -p 'erasing all your user ghc and cabal packages - are you sure (y/n) ? ' ans
test x$ans == xy && ( \
echo 'erasing directories under ~/.ghc'; rm -rf `find ~/.ghc -maxdepth 1 -type d`; \
echo 'erasing ~/.cabal/lib'; rm -rf ~/.cabal/lib; \
)
}
# Utility to constrain cabal from messing with global packages. If you install
# packages distributed with ghc as global packages and optionally the haskell
# platform as global packages, then the following command line will save you from
# messing up:
# $ cabal install `echo eval $(ghc-global-constraints)`
# or
# $ cabal install --upgrade-dependencies `echo eval $(ghc-global-constraints)`
function ghc-global-constraints() {
ghc-pkg list --global | tail -n+2 | head -n-1 | grep -v '(' | while read a; do
VER=${a##*-}
PKG=${a%-*}
echo -n "--constraint='$PKG==$VER' "
done
}
# Quick check to see which upper bounds are probably in need of an upgrade. Example usage:
# $ cabal-check-upper-bounds ./iproute.cabal
# Package Build-Depends:, upper bound base 5
#
# Package doctest, upper bound >= 0.9.3
# pkg: doctest 0.9.7
# From that output we can see that doctest could potentially be upgraded to version 0.9.7
function cabal-check-upper-bounds() {
grep '>=' $1 |
grep -v 'if ' |
grep -vi cabal-version |
perl -p -e 's,>=.*<,,;s/,//;' | while read a b; do
echo "Package $a, upper bound $b";
BEST_PKG=$(egrep "pkg: $a " ~/.cabal/packages/hackage.haskell.org/00-index.cache |
sort -r|
head -n 1 |
cut -d ' ' -f1,2,3);
echo $BEST_PKG;
done
}
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