[Haskell-cafe] cabal-install to produce a dependency tree

[Ozgur Akgun]

Dear Cafe,

What would be the easiest way of generating the following output, given a
package name optionally with additional constraints?

$- foo "X > 3"
"X > 3" depends on A-2.2, B-1.0, C-1.2
A-2.2 depends on D-1.2.3
...

I assume cabal-install internally does this anyway while creating the
installation plan, so is there an easy way to get this info out of cabal
install?

Thanks,
Ozgur
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