CODEWITHSUNDEEP
haskellhaskell-platform
user8488758
user8488758

Reputation:

Where can I find the source code of packages/modules?

I would like to look at the code of functions defined in modules, such as Data.List or Data.Map.

I can import Data.List module with 

import Data.List

and then I can use the functions nub or sort.

I would like to know where I can find these functions to look at their code.

In which directory are the modules installed by default?

PS: Windows 8.1, I installed Haskell Platform.

Upvotes: 1

Views: 832

Answers (2)

toraritte
toraritte

Reputation: 8303

As @arrowd notes in his answer,

That directory contains compiled modules, so you wouldn't be able to read the source there.

The GHC repo (and its Github mirror) can be directly browsed, but there is an easier way:

  1. Use Hoogle or Stackage to find the package where the module/function resides

    Note that Hoogle and Stackage are case-sensitive. (It's best to look up modules with their capitalized names.)

    A query for sort in Hoogle yields a list similar to the one below. Stackage has a slightly different style, but the basics are the same (mostly because it uses Hoogle for lookup). The lines in green under the result headings show the name(s) of the containing

    (1) package(s) (in small caps) and

    (2) module(s) (capitalized).

    There can be multiple functions with the same name, but the module and package name helps to choose the right one.

    Hoogle lookup

  2. Click on the function/module name

  3. Click on "#Source"

    Hackage lookup

Upvotes: 1

arrowd
arrowd

Reputation: 34411

That directory contains compiled modules, so you wouldn't be able to read the source there.

What you can do is to find your function in online documentation and then click "Source" on the right.

Upvotes: 3

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