ghclive complains about not finding 'Text.Blaze.Internal'

[josefs]

When I fire up ghclive in my browser and type anything, like '1+1' in the expression buffer I get the following response:

Could not find module `Text.Blaze.Internal'
Use -v to see a list of the files searched for.
hint> 1+1
Not in scope: type constructor or class `DisplayResult'
Not in scope: `displaying'
Not in scope: `+'
Perhaps you meant `P.+' (imported from Prelude)

[ekmett]

When you go to localhost:3000/loader what do you see?

[ekmett]

This is usually a sign that the contents of the edit buffer failed to compile

[ekmett]

@shapr I wonder if when we fail to reload Main if we should somehow rollback to the old state to avoid breaking the REPL

[soenkehahn]

I get a very similar error message:

Could not find module `Network.Web.GHCLive.Display'
Use -v to see a list of the files searched for.
hint> ()
Not in scope: type constructor or class `DisplayResult'
Not in scope: `displaying'
hint>

localhost:3000/loader says:

"Could not find module `Network.Web.GHCLive.Display'\nUse -v to see a list of the files searched for.\n"

I installed ghclive with cabal-dev, so most of the dependencies are in a non-standard location. It would be nice to be able to use ghclive with cabal-dev, as I couldn't install ghclive with cabal normally due to cabal dependency problems.

[josefs]

From localhost:3000/loader, even before I've entered anything into the edit page:

"Could not find module `Text.Blaze.Internal'\nUse -v to see a list of the files searched for.\n"

Just like soenkehahn I've built ghclive with cabal-dev.

[luite]

The problem is that the cabal-dev installed packages are in a different package db, and hint looks in the default package db. Unfortunately, hint doesn't appear to have an option to change this directly, but it does have Language.Haskell.Interpreter.Unsafe.unsafeRunInterpreterWithArgs. An quick fix would be to pass all command line arguments to this, you'd start ghclive with something like:

ghclive -package-conf ./cabal-dev/packages-7.4.2.conf

perhaps it would also be a good idea to split the ghclive package into two separate packages, ghclive with all the Yesod and hint dependencies (which can be safely installed with cabal-dev), and ghclive-lib with only those required for the Display class and the provided instances (which should then be installed with cabal).

[luite]

oh something i haven't tried, but which might work already:

export GHC_PACKAGE_PATH=$HOME/ghclive/cabal-dev/packages-7.4.2.conf

[josefs]

Using the -package-conf parameter doesn't help with my problem.

When I tried exporting the environment variable something strange happened. I got the edit page just fine but when I opened the loader page, ghclive didn't respond. I could kill it with ^C either, it froze up pretty hard.