Multi-line errors are created as multiple problems

[Tehnix]

The problemMatcher in VSCode unfortunately cannot handle multi-line errors (microsoft/vscode#9635). This means that currently, if the problem matching tasks is used, it'll look something like this,

While this is digestable, preferably this would only be one line.

An idea, because I doubt VSCode is gonna fix this any time soon, would be to send the stack output through a parser, which would convert the problem text to a single line, and leave everything else in tact.

A couple of regex playgrounds for the test log below,

• File/location regex https://regex101.com/r/czYsOg/2
• Problem regex https://regex101.com/r/pheGQR/2

Ignoring that the GHCJS boot package "aeson" has a different version, 1.1.1.0, than the resolver's wanted version, 1.0.2.1
lens-4.15.1: configure
lens-4.15.1: build
lens-4.15.1: copy/register
common-0.1.0.0: configure (lib)
common-0.1.0.0: build (lib)
common-0.1.0.0: copy/register
frontend-0.1.0.0: configure (lib + exe + test)
Configuring frontend-0.1.0.0...
frontend-0.1.0.0: build (lib + exe + test)
Preprocessing library frontend-0.1.0.0...
[1 of 2] Compiling Frontend.Update  ( src/Frontend/Update.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0_ghcjs/build/Frontend/Update.js_o )

/Users/tehnix/GitHub/Tehnix/miso-isomorphic-stack/frontend/src/Frontend/Update.hs:3:1: warning: [-Wunused-imports]
    The import of ‘makeLenses’ from module ‘Control.Lens’ is redundant
[2 of 2] Compiling Paths_frontend   ( .stack-work/dist/x86_64-osx/Cabal-1.24.2.0_ghcjs/build/autogen/Paths_frontend.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0_ghcjs/build/Paths_frontend.js_o )
Preprocessing executable 'frontend' for frontend-0.1.0.0...
[1 of 1] Compiling Main             ( bin/Main.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0_ghcjs/build/frontend/frontend-tmp/Main.js_o ) [Frontend.Update changed]
Linking .stack-work/dist/x86_64-osx/Cabal-1.24.2.0_ghcjs/build/frontend/frontend.jsexe (Main)
Preprocessing test suite 'spec' for frontend-0.1.0.0...
[1 of 2] Compiling Frontend.UpdateSpec ( test/Frontend/UpdateSpec.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0_ghcjs/build/spec/spec-tmp/Frontend/UpdateSpec.js_o ) [Frontend.Update changed]

/Users/tehnix/GitHub/Tehnix/miso-isomorphic-stack/frontend/test/Frontend/UpdateSpec.hs:5:1: warning: [-Wunused-imports]
    The import of ‘Common.Model’ is redundant
      except perhaps to import instances from ‘Common.Model’
    To import instances alone, use: import Common.Model()

/Users/tehnix/GitHub/Tehnix/miso-isomorphic-stack/frontend/test/Frontend/UpdateSpec.hs:6:1: warning: [-Wunused-imports]
    The import of ‘Frontend.Update’ is redundant
      except perhaps to import instances from ‘Frontend.Update’
    To import instances alone, use: import Frontend.Update()

/Users/tehnix/GitHub/Tehnix/miso-isomorphic-stack/frontend/test/Frontend/UpdateSpec.hs:13:7: warning: [-Wtype-defaults]
    • Defaulting the following constraints to type ‘[Char]’
        (Show a0)
          arising from a use of ‘shouldBe’
          at test/Frontend/UpdateSpec.hs:13:7-60
        (Eq a0)
          arising from a use of ‘shouldBe’
          at test/Frontend/UpdateSpec.hs:13:7-60
        (Data.String.IsString a0)
          arising from the literal ‘"Not implemented yet"’
          at test/Frontend/UpdateSpec.hs:13:7-27
    • In a stmt of a 'do' block:
        "Not implemented yet" `shouldBe` "Not implemented yet"
      In the second argument of ‘($)’, namely
        ‘do { "Not implemented yet" `shouldBe` "Not implemented yet" }’
      In the second argument of ‘($)’, namely
        ‘it "just works..."
         $ do { "Not implemented yet" `shouldBe` "Not implemented yet" }’
[2 of 2] Compiling Main             ( test/Spec.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0_ghcjs/build/spec/spec-tmp/Main.js_o ) [Test.Hspec changed]
Linking .stack-work/dist/x86_64-osx/Cabal-1.24.2.0_ghcjs/build/spec/spec.jsexe (Frontend.UpdateSpec,Main)
frontend-0.1.0.0: copy/register
Installing library in
/Users/tehnix/GitHub/Tehnix/miso-isomorphic-stack/frontend/.stack-work/install/x86_64-osx/lts-8.11/ghcjs-0.2.1.9008011_ghc-8.0.2/lib/x86_64-osx-ghcjs-0.2.1.9008011-ghc8_0_2/frontend-0.1.0.0-HK9srDkIBqEEHrW37I149C
Installing executable(s) in
/Users/tehnix/GitHub/Tehnix/miso-isomorphic-stack/frontend/.stack-work/install/x86_64-osx/lts-8.11/ghcjs-0.2.1.9008011_ghc-8.0.2/bin
Warning: the following files would be used as linker inputs, but linking is not being done: .stack-work/dist/x86_64-osx/Cabal-1.24.2.0_ghcjs/build/frontend/frontend
Registering frontend-0.1.0.0...
frontend-0.1.0.0: test (suite: spec)

Progress: 3/4
Frontend.UpdateSpec
  Just a blank test
    just works...

Finished in 0.0200 seconds
1 example, 0 failures

frontend-0.1.0.0: Test suite spec passed
Completed 4 action(s).
ExitSuccess
Type help for available commands. Press enter to force a rebuild.

Log files have been written to: /Users/tehnix/GitHub/Tehnix/miso-isomorphic-stack/frontend/.stack-work/logs/
ExitSuccess
Type help for available commands. Press enter to force a rebuild.
Ignoring that the GHCJS boot package "aeson" has a different version, 1.1.1.0, than the resolver's wanted version, 1.0.2.1
frontend-0.1.0.0: unregistering (local file changes: src/Frontend/Update.hs)
frontend-0.1.0.0: build (lib + exe)
Log files have been written to: /Users/tehnix/GitHub/Tehnix/miso-isomorphic-stack/frontend/.stack-work/logs/

--  While building custom Setup.hs for package frontend-0.1.0.0 using:
      /Users/tehnix/.stack/setup-exe-cache/x86_64-osx/Cabal-simple_mPHDZzAJ_1.24.2.0_ghcjs-0.2.1.9008011_ghc-8.0.2 --builddir=.stack-work/dist/x86_64-osx/Cabal-1.24.2.0_ghcjs build lib:frontend exe:frontend --ghcjs-options " -ddump-hi -ddump-to-file"
    Process exited with code: ExitFailure 1
    Logs have been written to: /Users/tehnix/GitHub/Tehnix/miso-isomorphic-stack/frontend/.stack-work/logs/frontend-0.1.0.0.log

    Preprocessing library frontend-0.1.0.0...
    [2 of 2] Compiling Frontend.Update  ( src/Frontend/Update.hs, .stack-work/dist/x86_64-osx/Cabal-1.24.2.0_ghcjs/build/Frontend/Update.js_o )

    /Users/tehnix/GitHub/Tehnix/miso-isomorphic-stack/frontend/src/Frontend/Update.hs:17:43: error:
        • Variable not in scope: ri :: Miso.URI
        • Perhaps you meant one of these:
            ‘uri’ (line 17), ‘pi’ (imported from Prelude),
            ‘Common.uri’ (imported from Common.Model)
Type help for available commands. Press enter to force a rebuild.