If you want more demonstration, I wrote a blog post[1] a while back that builds up the code to draw a maze using fgl. It only uses the basic features of the library, but I think it's a good overview of the ideas involved. The code is up on GitHub[2] and should still work, although it might be annoying to build because the drawing code uses Cairo and Gtk. [1]: http://jelv.is/blog/Generating-Mazes-with-Inductive-Graphs/ [2]: https://github.com/TikhonJelvis/inductive-mazes On Wed, Jul 22, 2015 at 3:29 PM, Ivan Lazar Miljenovic < ivan.miljenovic@gmail.com> wrote:

On 23 July 2015 at 05:21, Jeffrey Brown wrote:

...

Thanks, Ivan! It looks exciting. Is there a demo file floating around somewhere? Martin Erwig's old site [1] for FGL includes some demonstration code, which builds on a file called "test.hs" [2]; I know the site is obsolete but are those aspects of it still useful?

[1] https://web.engr.oregonstate.edu/~erwig/fgl/haskell/ [2] https://web.engr.oregonstate.edu/~erwig/fgl/haskell/test.hs

Most of those should still be valid, yes.

There's also the Examples module in fgl.

...

On Wed, Jul 22, 2015 at 6:07 AM, Ivan Lazar Miljenovic wrote:

...

I'm pleased to announce that I've (finally!) just released version 5.5.2.0 of [fgl]. Major changes in this release include a test suite, refactorings, code clean-ups and the following potentially breaking changes (in that they were previously unspecified or incorrect):

- `nodeRange` and `nodeRangeM` for the various graph data structures erroneously returned `(0,0)` for empty graphs (making them indistinguishable from graphs containing the single node `0`). They now match the default implementation of throwing an error.

- The behaviour of `delLEdge` when dealing with multiple edges was unspecified; it now deletes only a single edge and the new function `delAllLEdge` deletes all edges matching the one provided.

All changes can be found in the changelog.

[fgl]: https://hackage.haskell.org/package/fgl

Along with this I'm releasing version 0.2.0.0 of [fgl-arbitrary] (i.e. the "I finally build against the version on Hackage" release).

[fgl-arbitrary]: https://hackage.haskell.org/package/fgl-arbitrary

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com _______________________________________________ Libraries mailing list Libraries@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries