ghc-vis
Version 0.2.1 revision 0 uploaded by DennisFelsing.
Package meta
- Synopsis
- Live visualization of data structures in GHCi
- Description
Visualize live data structures in GHCi. Evaluation is not forced and you can interact with the visualized data structures. This allows seeing Haskell's lazy evaluation and sharing in action.
To use this package add the accompanying
ghci
file to your.ghci
like this:echo ":script $HOME/.cabal/share/ghc-vis-0.2.1/ghci" >> ~/.ghci
Now you can run ghci and experiment with
ghc-vis
. Start the visualization:$ ghci GHCi, version 7.4.2: http://www.haskell.org/ghc/ :? for help > :vis
A blank window should appear now. This is the visualization window. Add an expression to the visualization:
> let a = [1..3] > :view a > let b = cycle a > :view b > :view "foo" ++ "bar"
http://felsin9.de/nnis/ghc-vis/1.png
Functions are red, named objects are green and links to an already shown object are blue.
Notice how
a
is referenced byb
.Evaluate an object that is shown in the visualization. You can also click on the object to evaluate it.
> :eval t1
http://felsin9.de/nnis/ghc-vis/2.png
The first element of
b
has been evaluated. We see that it's a reference to the value that's also referenced in a, as they share the same name "t0".Switch between the list view and the graph view:
> :switch
http://felsin9.de/nnis/ghc-vis/3.png
When an object is updated by accessing it, you have to call
:update
to refresh the visualization window. You can also click on an object to force an update:> a !! 2 3 > :update
http://felsin9.de/nnis/ghc-vis/4.png
Clear the visualization window, this also happens when you
:load
or:reload
a source file:> :clear
- Author
- Dennis Felsing <dennis@felsin9.de>
- Bug reports
- n/a
- Category
- GHC, Debug, Development
- Copyright
- Dennis Felsing 2012
- Homepage
- http://felsin9.de/nnis/ghc-vis
- Maintainer
- Dennis Felsing <dennis@felsin9.de>
- Package URL
- n/a
- Stability
- n/a