計算機科学のブログ

name:                lesson
version:             0.1.0.0
github:              "githubuser/lesson"
license:             BSD3
author:              "Author name here"
maintainer:          "example@example.com"
copyright:           "2022 Author name here"

extra-source-files:
- README.md
- ChangeLog.md

# Metadata used when publishing your package
# synopsis:            Short description of your package
# category:            Web

# To avoid duplicated efforts in documentation and dealing with the
# complications of embedding Haddock markup inside cabal files, it is
# common to point users to the README.md file.
description:         Please see the README on GitHub at <https://github.com/githubuser/lesson#readme>

dependencies:
- base >= 4.7 && < 5
- bytestring

library:
  source-dirs: src

executables:
  lesson-exe:
    main:                Main.hs
    source-dirs:         app
    ghc-options:
    - -threaded
    - -rtsopts
    - -with-rtsopts=-N
    dependencies:
    - lesson

tests:
  lesson-test:
    main:                Spec.hs
    source-dirs:         test
    ghc-options:
    - -threaded
    - -rtsopts
    - -with-rtsopts=-N
    dependencies:
    - lesson

default-extensions: OverloadedStrings

module Main where

import qualified Data.ByteString.Char8 as BC
import Lib

bcInts :: [BC.ByteString]
bcInts = ["1", "2", "3", "4", "5"]

main :: IO ()
main = do
  print bcInts
  print $ map bcIntToInt bcInts

module Lib
  ( bcIntToInt,
  )
where

import qualified Data.ByteString.Char8 as BC

bcIntToInt :: BC.ByteString -> Int
bcIntToInt = read . BC.unpack

% stack exec lesson-exe
["1","2","3","4","5"]
[1,2,3,4,5]
%