[Haskell-cafe] ANNOUCE: graphviz-2999.10.0.0

[Ivan Lazar Miljenovic]

I'm pleased to announce a new version of my graphviz [1] library that
provides bindings to the Graphviz [2] suite of tools for visualising
graphs.

[1]: http://hackage.haskell.org/package/graphviz
[2]: http://graphviz.org/

Changes in this release:

* I followed my own advice and put in bounds on the version of FGL it
  used...

* Conversion of FGL-style graphs to `DotRepr` values is now achieved
  using the new `GraphvizParams` configuration type.  This allows us
  to define a single parameter that stores all the conversion
  functions to pass around rather than having to pass around several
  functions.  This also allows all the non-clustered and clustered
  functions to be collapsed together, whereas what used to be handled
  by the primed functions is now achieved by using the
  `setDirectedness` function.

  There are three default `GraphvizParams` available:

    - `defaultParams` provides some sensible defaults (no attributes
      or clustering).

    - `nonClusteredParams` is an alias of `defaultParams` where the
      clustering type is explicitly set to be `()` for cases where you
      don't want any clustering at all (whereas `defaultParams` allows
      you to set your own clustering functions).

    - `blankParams` sets all fields to be `undefined`; this is useful
      for situations where you have functions that will set some
      values for you and there is no sensible default you can use
      (mainly for the clustering function).

* Expansion of the `DotRepr` class:

    - More common functions are now defined as methods (`getID`,
      etc.).

    - The ability to get more information about the structure of the
      `DotRepr` graph, as well as where all the `DotNode`s are, etc.

    - `graphNodes` now returns `DotNode`s defined only as part of
      `DotEdge`s, and will also merge duplicate `DotNode`s together.

    - `graphNodes` and `graphEdges` also return `GlobalAttributes`
      that apply to them.

* The `Point` type now only has one constructor: `Point Double
  Double`.  The `Int`-only constructor was present due to historical
  purposes and I thought that the `Pos` value for a `DotNode` would
  always be a pair of `Int`s; this turns out not to be the case (and
  accounted for some bugs in older versions of my SourceGraph tool; it's
  taken me this long to remember to fix this...).

* `SortV` and `PrismOverlap` now only take `Word16` values rather than
  `Int`s, as they're not meant to allow negative values (the choice of
  using `Word16` rather than `Word` was arbitrary, and because it's
  unlikely those values will be large enough to require the larger
  values available in `Word`).

* `NodeCluster` has been generalised to not have to take an `LNode`
  for the node type; the type alias `LNodeCluster` is available if you
  still want this.

* Several documentation typos fixed, including one spotted by Kevin
  Quick.

* The test-suite now allows running individual tests.

--
Ivan Lazar Miljenovic
Ivan.Miljenovic at gmail.com
IvanMiljenovic.wordpress.com