cabal usage

[Johannes Waldmann]

what is the recommended way (fewest keystrokes) for:

* cabal install foo (download from hackage)
* build failure => edit sources => repeat install on modified sources

Is it really "cabal fetch foo"
then "tar xvfz ~/.cabal/some/very/long/pathname.tgz" ?

during the original "cabal install",
sources seem to be in /tmp/TMPfoo-*/*
but they are removed on failure.

or - is this a workflow that should not happen
(e.g. it might lead to confusing error messages later
because "ghc-pkg list" shows the original version number
if I forget to bump it while patching the sources)

J.W.

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