ghc-mod 的切换组件

Question

我有一个项目，其主要的 cabal 组件是一个库

library
  hs-source-dirs:      src
  ...

并且还定义了

executable todo
   if !flag(example)
        Buildable: False
   ghc-options: -Wall
   cpp-options: -DGHCJS_BROWSER

   default-language: Haskell2010
   hs-source-dirs: example/todo
   other-modules: TodoDispatcher
                  TodoStore
                  TodoComponents


   main-is: Main.hs

现在，如果我尝试键入检查一个文件，我会收到以下错误

Configuring react-flux-1.0.3...
EXCEPTION: types:
           Could not find module ‘TodoDispatcher’
           Use -v to see a list of the files searched for.

如果我从命令行这样做，我会得到

 $ ghc-mod  --ghcOpt=-v7 type example/todo/TodoViews.hs 29 28                                            not sandboxed
EXCEPTION: types:
           Could not find module ‘TodoDispatcher’
           Locations searched:
             .stack-work/dist/x86_64-osx/Cabal-1.22.8.0/build/TodoDispatcher.hs
             .stack-work/dist/x86_64-osx/Cabal-1.22.8.0/build/TodoDispatcher.lhs
             .stack-work/dist/x86_64-osx/Cabal-1.22.8.0/build/TodoDispatcher.hsig
             .stack-work/dist/x86_64-osx/Cabal-1.22.8.0/build/TodoDispatcher.lhsig
             src/TodoDispatcher.hs
             src/TodoDispatcher.lhs
             src/TodoDispatcher.hsig
             src/TodoDispatcher.lhsig
             .stack-work/dist/x86_64-osx/Cabal-1.22.8.0/build/autogen/TodoDispatcher.hs
             .stack-work/dist/x86_64-osx/Cabal-1.22.8.0/build/autogen/TodoDispatcher.lhs
             .stack-work/dist/x86_64-osx/Cabal-1.22.8.0/build/autogen/TodoDispatcher.hsig
             .stack-work/dist/x86_64-osx/Cabal-1.22.8.0/build/autogen/TodoDispatcher.lhsig

所以它似乎忽略了我尝试类型检查的当前文件所属组件的 hs-source-dirs 设置，而是考虑来自包的第一个组件的那个，就像 cabal repl 默认会做

By default cabal repl loads the first component in a package.

我怎样才能更改全局状态的那一点？

Answer 1

好的，为了使它正常工作，您应该执行以下操作：

您需要编辑cabal文件，将组件的flag改为
```
`Buildable : True`
```

然后您可以输入检查

 $ ghc-mod --ghcOpt=-v7 type example/todo/TodoViews.hs 29 28                                            not sandboxed
 29 24 29 34 "[Char]"
 27 25 33 12 "TextInputArgs"
 27 9 33 12 "ReactElementM [

在 Emacs 中：

你可能需要离开 Emacs
您需要打开文件并 haskell-process-load-file（又名 C-c C-l，又名 Space m s b）

它应该加载正确的 "target"，这是 haskell-modcabal 中 "component" 的说法。如果可行，那么 ghc-mod 也应该。 (?)

http://haskell.github.io/haskell-mode/manual/latest/Interactive-Haskell.html

14.8.1 Changing REPL target

With haskell-session-change-target you can change the target for REPL session.

After REPL session started, in haskell-interactive-mode buffer invoke the haskell-session-change-target and select from available targets for

Testing

Benchmark

Executable

Library

Answer “yes” to restart the session and run your tests, benchmarks, executables.

ghc-mod 的切换组件

switching component for ghc-mod

haskell

ghc-mod

14.8.1 Changing REPL target