A graph of the interdependencies of the packages of hackage.haskell.org.
Graphviz (DOT) Haskell
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Graph of Hackage packages

Inspired by the recent release of cabal-db, I wondered what Hackage might look like on a larger scale.

Hackage currently (April 2014) consists of around 6000 nodes (packages) with 36000 edges (dependencies). Only the dependencies of the latest version of each package are taken into account. Ignoring packages with two or less dependencies and base, here is what it looks like:

A higher resolution that includes package names image is available in the out directory (18 MiB PNG), as well as the raw dot file to create it.

Since there are lots of dependencies going all over the place, the graph is mostly a giant blob. To extract useful information from it probably requires special focus in an appropriate program.


The rather hacky program reads the locally stored package database 00-index.tar from a hardcoded location (in Main.hs), and generates data in dot format to represent all packages and which packages they depend on. The result is written to STDOUT, ready to be plotted with GraphViz compatible tools such as Gephi.

To build and run from scratch, proceed as usual:

cabal sandbox init && cabal install --only-dependencies
cabal run -v0 > output.dot