コードの整理とプロジェクトのビルド Monad型クラス stackを使ってプロジェクトをビルドする コードを記述する
入門Haskellプログラミング (Will Kurt(著)、株式会社クイープ(監修、翻訳)、翔泳社)のUNIT6(コードの整理とプロジェクトのビルド)、LESSON35(stackを使ってプロジェクトをビルドする)、35.3(コードを記述する)、クイックチェック 35-3の解答を求めてみる。
palindrome-checker.cabalファイルのlibraryのexposed-modulesのLibをPalindromeに書き換えればいい。
palindrome-checker.cabal
cabal-version: 1.12
-- This file has been generated from package.yaml by hpack version 0.34.4.
--
-- see: https://github.com/sol/hpack
name: palindrome-checker
version: 0.1.0.0
description: Please see the README on GitHub at <https://github.com/githubuser/palindrome-checker#readme>
homepage: https://github.com/githubuser/palindrome-checker#readme
bug-reports: https://github.com/githubuser/palindrome-checker/issues
author: Author name here
maintainer: example@example.com
copyright: 2022 Author name here
license: BSD3
license-file: LICENSE
build-type: Simple
extra-source-files:
README.md
ChangeLog.md
source-repository head
type: git
location: https://github.com/githubuser/palindrome-checker
library
exposed-modules:
Palindrome
other-modules:
Paths_palindrome_checker
hs-source-dirs:
src
build-depends:
base >=4.7 && <5
default-language: Haskell2010
executable palindrome-checker-exe
main-is: Main.hs
other-modules:
Paths_palindrome_checker
hs-source-dirs:
app
ghc-options: -threaded -rtsopts -with-rtsopts=-N
build-depends:
base >=4.7 && <5
, palindrome-checker
default-language: Haskell2010
test-suite palindrome-checker-test
type: exitcode-stdio-1.0
main-is: Spec.hs
other-modules:
Paths_palindrome_checker
hs-source-dirs:
test
ghc-options: -threaded -rtsopts -with-rtsopts=-N
build-depends:
base >=4.7 && <5
, palindrome-checker
default-language: Haskell2010
コード
app/Main.hs
module Main where
import Palindrome
main :: IO ()
main = print isPalindrome
コード
src/Palindrome.hs
{-# LANGUAGE OverloadedStrings #-}
module Palindrome
( isPalindrome,
)
where
isPalindrome :: [Char]
isPalindrome = "isPalindrome"
入出力結果(Terminal, Zsh)
% stack build
palindrome-checker-0.1.0.0: unregistering (local file changes: app/Main.hs src/Palindrome.hs)
palindrome-checker> build (lib + exe)
Preprocessing library for palindrome-checker-0.1.0.0..
Building library for palindrome-checker-0.1.0.0..
[2 of 2] Compiling Palindrome
Preprocessing executable 'palindrome-checker-exe' for palindrome-checker-0.1.0.0..
Building executable 'palindrome-checker-exe' for palindrome-checker-0.1.0.0..
[2 of 2] Compiling Main
Linking .stack-work/dist/x86_64-osx/Cabal-3.2.1.0/build/palindrome-checker-exe/palindrome-checker-exe ...
palindrome-checker> copy/register
Installing library in /Users/…/palindrome-checker/.stack-work/install/x86_64-osx/e39fa63852b3f10f810d09adf64598107c29e3897fb5f28ebd525048b485f8ab/8.10.7/lib/x86_64-osx-ghc-8.10.7/palindrome-checker-0.1.0.0-HO7CoLYbgortDs5KN64VY
Installing executable palindrome-checker-exe in /Users/…/palindrome-checker/.stack-work/install/x86_64-osx/e39fa63852b3f10f810d09adf64598107c29e3897fb5f28ebd525048b485f8ab/8.10.7/bin
Registering library for palindrome-checker-0.1.0.0..
% stack exec palindrome-checker-exe
"isPalindrome"
%