と言う訳で、正攻法ではないかもですが、Stackを使ってHello Worldやってみました。
参考
The Haskell Tool Stack - Install/upgrade
The Haskell Tool Stack - User guide
vagrantを使用して環境を作成。(以下、使用したbox)
config.vm.box = "geerlingguy/centos7"
ログイン後、とりあえずyum update
$ sudo yum update -y
~~~~略~~~~
stackインストール
$ curl -sSL https://get.haskellstack.org/ | sh
~~~~略~~~~
Stack has been installed to: /usr/local/bin/stack
インストール確認
$ stack --version
Version 1.4.0, Git revision e714f1dd3fade19496d91bd6a017e435a96a6bcd (4640 commits) x86_64 hpack-0.17.0
プロジェクト作成
$ stack new helloworld new-template
Downloading template "new-template" to create project "helloworld" in helloworld/ ...
The following parameters were needed by the template but not provided: author-email, author-name, category, copyright, github-username
You can provide them in /home/vagrant/.stack/config.yaml, like this:
templates:
params:
author-email: value
author-name: value
category: value
copyright: value
github-username: value
Or you can pass each one as parameters like this:
stack new helloworld new-template -p "author-email:value" -p "author-name:value" -p "category:value" -p "copyright:value" -p "github-username:value"
Looking for .cabal or package.yaml files to use to init the project.
Using cabal packages:
- helloworld/helloworld.cabal
Selecting the best among 10 snapshots...
Downloaded lts-8.13 build plan.
Selected mirror https://s3.amazonaws.com/hackage.fpcomplete.com/
Downloading root
Selected mirror https://s3.amazonaws.com/hackage.fpcomplete.com/
Downloading timestamp
Downloading snapshot
Downloading mirrors
Cannot update index (no local copy)
Downloading index
Updated package list downloaded
Populated index cache.
* Matches lts-8.13
Selected resolver: lts-8.13
Initialising configuration using resolver: lts-8.13
Total number of user packages considered: 1
Writing configuration to file: helloworld/stack.yaml
All done.
作成されたプロジェクトを確認
$ ls
helloworld
移動
$ cd helloworld/
セットアップ
$ stack setup
Preparing to install GHC to an isolated location.
This will not interfere with any system-level installation.
Downloaded ghc-8.0.2.
Installed GHC.
stack will use a sandboxed GHC it installed
For more information on paths, see 'stack path' and 'stack exec env'
To use this GHC and packages outside of a project, consider using:
stack ghc, stack ghci, stack runghc, or stack exec
ビルド?
$ stack build
[1 of 2] Compiling Main ( /home/vagrant/.stack/setup-exe-src/setup-mPHDZzAJ.hs, /home/vagrant/.stack/setup-exe-src/setup-mPHDZzAJ.o )
[2 of 2] Compiling StackSetupShim ( /home/vagrant/.stack/setup-exe-src/setup-shim-mPHDZzAJ.hs, /home/vagrant/.stack/setup-exe-src/setup-shim-mPHDZzAJ.o )
Linking /home/vagrant/.stack/setup-exe-cache/x86_64-linux/tmp-Cabal-simple_mPHDZzAJ_1.24.2.0_ghc-8.0.2 ...
helloworld-0.1.0.0: configure (lib + exe)
Configuring helloworld-0.1.0.0...
helloworld-0.1.0.0: build (lib + exe)
Preprocessing library helloworld-0.1.0.0...
[1 of 1] Compiling Lib ( src/Lib.hs, .stack-work/dist/x86_64-linux/Cabal-1.24.2.0/build/Lib.o )
Preprocessing executable 'helloworld-exe' for helloworld-0.1.0.0...
[1 of 1] Compiling Main ( app/Main.hs, .stack-work/dist/x86_64-linux/Cabal-1.24.2.0/build/helloworld-exe/helloworld-exe-tmp/Main.o )
Linking .stack-work/dist/x86_64-linux/Cabal-1.24.2.0/build/helloworld-exe/helloworld-exe ...
helloworld-0.1.0.0: copy/register
Installing library in
/home/vagrant/haskell/helloworld/.stack-work/install/x86_64-linux/lts-8.13/8.0.2/lib/x86_64-linux-ghc-8.0.2/helloworld-0.1.0.0-44GC3BWnM1QFjPMM1ngxcQ
Installing executable(s) in
/home/vagrant/haskell/helloworld/.stack-work/install/x86_64-linux/lts-8.13/8.0.2/bin
Registering helloworld-0.1.0.0...
実行してみる。
$ stack exec helloworld-exe
someFunc
テスト?
$ stack test
helloworld-0.1.0.0: unregistering (components added: test:helloworld-test)
helloworld-0.1.0.0: build (lib + exe + test)
Preprocessing library helloworld-0.1.0.0...
Preprocessing executable 'helloworld-exe' for helloworld-0.1.0.0...
Preprocessing test suite 'helloworld-test' for helloworld-0.1.0.0...
[1 of 1] Compiling Main ( test/Spec.hs, .stack-work/dist/x86_64-linux/Cabal-1.24.2.0/build/helloworld-test/helloworld-test-tmp/Main.o )
Linking .stack-work/dist/x86_64-linux/Cabal-1.24.2.0/build/helloworld-test/helloworld-test ...
helloworld-0.1.0.0: copy/register
Installing library in
/home/vagrant/haskell/helloworld/.stack-work/install/x86_64-linux/lts-8.13/8.0.2/lib/x86_64-linux-ghc-8.0.2/helloworld-0.1.0.0-44GC3BWnM1QFjPMM1ngxcQ
Installing executable(s) in
/home/vagrant/haskell/helloworld/.stack-work/install/x86_64-linux/lts-8.13/8.0.2/bin
Registering helloworld-0.1.0.0...
helloworld-0.1.0.0: test (suite: helloworld-test)
Progress: 1/2Test suite not yet implemented
Progress: 1/2
src/Lib.hsの内容確認
$ cat src/Lib.hs
module Lib
( someFunc
) where
someFunc :: IO ()
someFunc = putStrLn "someFunc"
src/Lib.hsを変更する
someFunc = putStrLn "someFunc" を
someFunc = putStrLn "Hello World!" に変更する
$ vi src/Lib.hs
module Lib
( someFunc
) where
someFunc :: IO ()
someFunc = putStrLn "Hello World!"
再ビルド
$ stack build
helloworld-0.1.0.0: unregistering (local file changes: src/Lib.hs)
helloworld-0.1.0.0: build (lib + exe)
Preprocessing library helloworld-0.1.0.0...
[1 of 1] Compiling Lib ( src/Lib.hs, .stack-work/dist/x86_64-linux/Cabal-1.24.2.0/build/Lib.o )
Preprocessing executable 'helloworld-exe' for helloworld-0.1.0.0...
[1 of 1] Compiling Main ( app/Main.hs, .stack-work/dist/x86_64-linux/Cabal-1.24.2.0/build/helloworld-exe/helloworld-exe-tmp/Main.o ) [Lib changed]
Linking .stack-work/dist/x86_64-linux/Cabal-1.24.2.0/build/helloworld-exe/helloworld-exe ...
helloworld-0.1.0.0: copy/register
Installing library in
/home/vagrant/haskell/helloworld/.stack-work/install/x86_64-linux/lts-8.13/8.0.2/lib/x86_64-linux-ghc-8.0.2/helloworld-0.1.0.0-44GC3BWnM1QFjPMM1ngxcQ
Installing executable(s) in
/home/vagrant/haskell/helloworld/.stack-work/install/x86_64-linux/lts-8.13/8.0.2/bin
Registering helloworld-0.1.0.0...
テストもとりあえず
$ stack test
helloworld-0.1.0.0: unregistering (components added: test:helloworld-test)
helloworld-0.1.0.0: build (lib + exe + test)
Preprocessing library helloworld-0.1.0.0...
Preprocessing executable 'helloworld-exe' for helloworld-0.1.0.0...
Preprocessing test suite 'helloworld-test' for helloworld-0.1.0.0...
helloworld-0.1.0.0: copy/register
Installing library in
/home/vagrant/haskell/helloworld/.stack-work/install/x86_64-linux/lts-8.13/8.0.2/lib/x86_64-linux-ghc-8.0.2/helloworld-0.1.0.0-44GC3BWnM1QFjPMM1ngxcQ
Installing executable(s) in
/home/vagrant/haskell/helloworld/.stack-work/install/x86_64-linux/lts-8.13/8.0.2/bin
Registering helloworld-0.1.0.0...
helloworld-0.1.0.0: test (suite: helloworld-test)
Progress: 1/2Test suite not yet implemented
Progress: 1/2
実行してみる
$ stack exec helloworld-exe
Hello World!
Hello Worldの完成!
helloworldアプリの動き
たぶん以下の流れで動いているのかな？
1. helloworld実行
2. app/Main.hs が呼ばれる
Main.hsにはLibがimportされている
3.Main.hsからsomeFunc関数が呼ばれる
4.Hello World!が表示される
Main.hsの中身
$ cat app/Main.hs
module Main where
import Lib
main :: IO ()
main = someFunc
とりあえずHello Worldはあっさり出来ました。
Hello Worldだしあっさりしてて当然かな?
ちなみに参考にしたUser guideでは、
ビルド時の依存関係やらなんやらの説明が主でした。
またの機会にちゃんとやりたいと思います。
今回は以上です。
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