@hackage / haltavista

Haltavista

Search for haskell functions in installed libraries by providing input/output examples.

Requirements

Hoogle has to be installed.

Usage

Example session 1:

brauner@worf:~$ haltavista
2 2 4
<EOF>

Prelude (*)
Prelude (+)
Prelude (^)

Example session 2 (refining search 1):

brauner@worf:~$ haltavista
2 2 4
1 2 3
<EOF>

Prelude (+)

Example session 3 (higher-order functions):

brauner@worf:~$ haltavista 
(+1) (+2) (1,1) (2,3)
<EOF>

Data.Graph.Inductive.Query.Monad (><)

Credits

Under the hood, uses:

• hint for type inference;
• hoogle to get a list of candidate functions;
• hint for testing.

Hoogle calling facility has been copy-pasted (and later modified) from the Yi project.

Todo

• catch stack overflows (is that possible?)
• catch other errors (should do but doesn't for some reason)