Fix showDocumentation command.

[pranaysashank]

It is not a perfect solution but I think it's a bit better than having an empty webview

Fix showDocumentation command

I removed the iframe and instead pass the html directly to the webview.

I had to set base url to the documentation directory so that the css files can be fetched properly.

The links in the opened documentation are broken and they can't be opened in the webview (at least I couldn't figure out how to do that), when you click on a link it opens it it the users browser but because we have base url set, the opened link points to something like https://file+.vscode-resource.vscode-webview.net/nix/store/n104dcsv7gc8l7c2mc2lixp220il8lk8-ghc-8.10.4-doc/share/doc/ghc/html/libraries/base-4.14.1.0/Control-Monad.html#t:Monad.

An alternative is to have the css files required for correct haddocks rendering in the extension itself, this can be done if the css file (linuwial.css) is the same for every library. This way we can set the base url to hackage docs and the external links should work fine.

New config option

Added a new configuration option openDocumentationInHackage which if set to true will always open documentation in user's browser on hackage and not in the webview.

Future work

• Noticed that the source urls on my filesystem are different from the ones on hackage. For example,
  on my system: file:///nix/store/n104dcsv7gc8l7c2mc2lixp220il8lk8-ghc-8.10.4-doc/share/doc/ghc/html/libraries/mtl-2.2.2/src/Control-Monad-Reader-Class.html#t:MonadReader
  vs on hackage: https://hackage.haskell.org/package/mtl-2.2.2/docs/src/Control.Monad.Reader.Class.html#MonadReader (notice the .s vs the -s).
  This can be fixed in the processLink function. (Fixed in c59ae94)

• It'll also be nice to have a separate command for showSource and a corresponding configuration option to either always view it in vscode vs hackage. (Added openSourceInHackage setting in c8f7039)

[pranaysashank]

Forgot to mention, but there also doesn't seem to be a way to support navigation inside webview so links like (.../Control-Monad-Reader-Class.html#MonadReader) do not navigate to #MonadReader they just stay at the top of the file.

Probably better to always open the documentation on hackage

[jneira]

many thanks for trying to fix it, as you commented the limitations makes more reliable open docs in hackage, so I would set the config option to true by default

[pranaysashank]

Pushed two commits to set the config option to true by default and fix the source file urls.

[pranaysashank]

This should now also fix #360. Please let me know if this change breaks any other working links.

[jneira]

Lets merge this, many thanks!