Support hie-bios’ none cradle

[cocreature]

hie-bios 0.3.0 added a none cradle for files that should be ignored, e.g., because they cannot be loaded for some reason. We should also support this but it doesn’t make much sense before we support multi cradles.

[jneira]

Hi, i've just tested a simple stack project with this hie.yaml

cradle:
  multi:
    - path: "./test/MyTest"
      config: { cradle: { none:  } }

    - path: "./"
      config:
        cradle:
          stack:
            - path: "./.stack-work"
              component: "stack-test:lib"
            - path: "./app"
              component: "stack-test:exe:stack-test"
            - path: "./src"
              component: "stack-test:lib"
            - path: "./test"
              component: "stack-test:test:stack-test-test"

Executing ghcide in the project root:

PS D:\dev\ws\haskell\stack-test> ghcide
ghcide version: 0.2.0 (GHC: 8.8.3) (PATH: D:\bin\ghcide.exe)   
Ghcide setup tester in D:\dev\ws\haskell\stack-test.
Report bugs at https://github.com/digital-asset/ghcide/issues  

Step 1/4: Finding files to test in D:\dev\ws\haskell\stack-test
Found 3 files

Step 2/4: Looking for hie.yaml files that control setup
Found 1 cradle

Step 3/4: Initializing the IDE

Step 4/4: Type checking the files
[INFO] Consulting the cradle for "D:\\dev\\ws\\haskell\\stack-test\\app\\Main.hs"
> Using main module: 1. Package `stack-test' component stack-test:exe:stack-test with main-is file: D:\dev\ws\haskell\stack-test\app\Main.hs
> Configuring GHCi with the following packages: stack-test
> D:\dev\ws\haskell\stack-test\.stack-work\install\87555bbb\pkgdb;C:\sr\snapshots\4b7c4109\pkgdb;D:\bin\stack\x86_64-windows\ghc-8.8.3\lib\package.conf.d
[INFO] Making new HscEnv[main]
[INFO] Consulting the cradle for "D:\\dev\\ws\\haskell\\stack-test\\test\\MyLibTest.hs"
[INFO] Consulting the cradle for "D:\\dev\\ws\\haskell\\stack-test\\src\\MyLib.hs"
> Configuring GHCi with the following packages: stack-test
> D:\dev\ws\haskell\stack-test\.stack-work\install\87555bbb\pkgdb;C:\sr\snapshots\4b7c4109\pkgdb;D:\bin\stack\x86_64-windows\ghc-8.8.3\lib\package.conf.d
[INFO] Making new HscEnv[main,main]
[INFO] Consulting the cradle for "D:\\dev\\ws\\haskell\\stack-test\\.stack-work\\dist\\29cc6475\\build\\autogen\\Paths_stack_test.hs"
> Configuring GHCi with the following packages: stack-test
> D:\dev\ws\haskell\stack-test\.stack-work\install\87555bbb\pkgdb;C:\sr\snapshots\4b7c4109\pkgdb;D:\bin\stack\x86_64-windows\ghc-8.8.3\lib\package.conf.d
[INFO] Making new HscEnv[main,main,main]
Files that failed:
 * D:\dev\ws\haskell\stack-test\test\MyLibTest.hs

In the editor you can observe hover has no effect in MyLibTest.hs and there is no diagnostics for it
If i remove the none cradle:

[INFO] Consulting the cradle for "D:\\dev\\ws\\haskell\\stack-test\\test\\MyLibTest.hs"
[INFO] Consulting the cradle for "D:\\dev\\ws\\haskell\\stack-test\\src\\MyLib.hs"
File:     D:\dev\ws\haskell\stack-test\test\MyLibTest.hs
Hidden:   no
Range:    1:0-100001:0
Source:   compiler
Severity: DsError
Message:
  Multi Cradle: No prefixes matched
  pwd: D:\dev\ws\haskell\stack-test
  filepath: D:\dev\ws\haskell\stack-test\test\MyLibTest.hs
  prefixes:
  ("./.stack-work",Stack {component = Just "stack-test:lib"})
  ("./app",Stack {component = Just "stack-test:exe:stack-test"})
  ("./src",Stack {component = Just "stack-test:lib"})

@cocreature so i guess that the none cradle is supported since haskell/ghcide#522 was merged

[jneira]

closing as the feature is supported