How to import a .hs file in Haskell

Question

I have made a file called time.hs. It contains a single function that measures the execution time another function.

Is there a way to import the time.hs file into another Haskell script?

I want something like:

module Main where import C:\Haskell\time.hs  main = do     putStrLn "Starting..."     time $ print answer     putStrLn "Done." 

Where time is defined in the 'time.hs' as:

module time where Import <necessary modules>  time a = do start <- getCPUTime v <- a end   <- getCPUTime let diff = (fromIntegral (end - start)) / (10^12) printf "Computation time: %0.3f sec\n" (diff :: Double) return v 

I don't know how to import or load a separate .hs file. Do I need to compile the time.hs file into a module before importing?

Answer 1

Time.hs:

module Time where ... 

script.hs:

import Time ... 

Command line:

ghc --make script.hs 

Answer 2

If the module Time.hs is located in the same directory as your "main" module, you can simply type:

import Time 

It is possible to use a hierarchical structure, so that you can write import Utils.Time. As far as I know, the way you want to do it won't work.

For more information on modules, see here Learn You a Haskell, Making Our Own Modules.