Haskell-ide-engine: Hoogle lookups not working on local db

[stellarhoof]

As per the README I've tried:

$ hoogle generate
$ stack exec hoogle generate

I've enabled logging but it (unhelpfully) shows the same information as in the popup in VSCode:

2017-12-07 18:35:02.397034 [ThreadId 12] - <--2--{"jsonrpc":"2.0","method":"window/showMessage","params":{"type":2,"message":"No hoogle db found. Check the README for instructions to generate one"}}

Then on trying

$ stack hoogle
$ stack build

I get

2017-12-07 18:49:35.225028 [ThreadId 12] - <--2--{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":4,"message":"Using hoogle db at: /Users/berserk/Source/dhall-haskell/.stack-work/hoogle/x86_64-osx/lts-9.6/8.0.2/database.hoo"}}

which makes sense. It's using the local db. However on opening https://github.com/dhall-lang/dhall-haskell/blob/master/src/Dhall.hs and trying to get the type for Control.Applicative doesn't work.

hoogle --version returns 5.0.14. Is it possible that version isn't looked for? I've installed 5.0.13 as per #285 and it finds the database. However as with the local database it still doesn't find type definitions for Control.Applicative. Doing hoogle Control.Applicative on the cmdline works fine.

[stellarhoof]

Also hovering on atomically on src/Haskell/Ide/Engine doesn't return documentation like in the gif in the README.

[wz1000]

@alanz changed the hover request to immediately respond even if a recompile
is in progress. However this meant disabling documentation lookup due to
some technical issues. I am working on getting this re-enabled ASAP.

On 08-Dec-2017 05:12, "Alejandro Hernandez" [e-mail]
wrote:

As per the README I've tried all possibilities:

$ hoogle generate
$ stack exec hoogle generate
$ stack hoogle
$ stack build

Then on opening https://github.com/dhall-lang/
dhall-haskell/blob/master/src/Dhall.hs and trying to get the type for
Control.Applicative doesn't work. I've enabled logging but it
(unhelpfully) shows the same information as in the popup in VSCode:

2017-12-07 18:35:02.397034 [ThreadId 12] - <--2--{"jsonrpc":"2.0","method":"window/showMessage","params":{"type":2,"message":"No hoogle db found. Check the README for instructions to generate one"}}

hoogle --version returns 5.0.14. Is it possible that version isn't looked
for? From #285 https://github.com/haskell/haskell-ide-engine/issues/285
I can see that it works with 5.0.13
Any ideas?

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[alanz]

Speed, accuracy. Choose one :)

[AlexeyRaga]

Speed, accuracy. Choose one :)

1. Make it work
2. Make it beautiful
3. Make it fast

;)

[alanz]

Actually the docs are always accurate, it is just where they come from, whether a bigger or smaller db is consulted.

[wz1000]

I've got hoogle working with async on my branch now!

https://github.com/wz1000/haskell-ide-engine

It will be merged into this repo in a couple of days.

[stellarhoof]

@wz1000 Does it have a way of getting the fully qualified name of the identifier? It'd be great if I could go straight into hoogle --info instead of getting a list of candidates.

[wz1000]

@stellarhoof it does tell you the package and module the symbol comes from.

[nponeccop]

@stellarhoof Does this problem still happen after the fixes?

[stellarhoof]

Worse, now it's just stuck on Loading.... I cannot get any type/docs information whatsoever. Not even for my own project (using VSCode btw). Checking the logs I see hie: /Users/berserk/.stack/snapshots/x86_64-osx/lts-9.17/8.0.2/pkgdb/package.cache: GHC.PackageDb.readPackageDb: inappropriate type (not enough bytes).
Is it relevant that I compiled hie with GHC 8.2.2 and it's looking at the pkgdb for 8.0.2? I don't know much about these issues.

[AlexeyRaga]

I compile hie with GHC 8.0.2 and there is no problem in Dhall (or other projects I work with):

Perhaps the fact that you use hie compiled with a different version of GHC causes the problem.

It would be nice if we could have different executables, like hie-8.0 and hie-8.2 and the plugin could "automatically" choose which one to use... But I guess it is another story.

[nponeccop]

Is it relevant that I compiled hie with GHC 8.2.2 and it's looking at the pkgdb for 8.0.2? I don't know much about these issues.

Yes, hie requires GHC version to be the same but doesn't warn about mismatches, see #414. So rebuild hie with --stack-yaml=stack-8.0.2 and retry

It would be nice if we could have different executables, like hie-8.0 and hie-8.2 and the plugin could "automatically" choose which one to use... But I guess it is another story.

Yes, the issue is already open. See the discussion at https://github.com/alanz/vscode-hie-server/issues/31

[stellarhoof]

I built my project with 8.2.2 and I got mixed results:
If using a global hoogle db:

2017-12-19 13:37:35.082145 [ThreadId 5] - <--2--{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":4,"message":"Using hoogle db at: /Users/berserk/.hoogle/default-haskell-5.0.14.hoo"}}

I can get info for all the symbols in scope but not for modules such as Control.Monad, whereas hoogle --info Control.Monad works fine.

However if using a local hoogle db:

2017-12-19 13:52:43.977174 [ThreadId 5] - <--2--{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":4,"message":"Using hoogle db at: /Users/berserk/Source/scheme-parser/.stack-work/hoogle/x86_64-osx/nightly-2017-12-15/8.2.2/database.hoo"}}

I still get Loading...

[nponeccop]

@AlexeyRaga Your screencast doesn't attempt to hover over module names. You only hover over symbols.

@stellarhoof I think this issue should focus on "broken" local db (we still need @alanz and/or @wz1000 to confirm) and hovering over module names should be a separate feature request

[nponeccop]

@stellarhoof great!

[alanz]

@wz1000 to your knowledge, is this still a problem?

[wz1000]

I don't think so.