Plugin system

[jgm]

Plugin system

[jgm]

Google Code Info:
Author: [email protected]
Created On: 2008-11-06T22:23:20.000Z

[jgm]

Unfortunately, dons says that the plugins library is no longer maintained.

Google Code Info:
Author: [email protected]
Created On: 2008-11-11T03:04:33.000Z

[jgm]

The hint library might be an alternative to plugins. Check to see if it is actively
maintained.

Google Code Info:
Author: [email protected]
Created On: 2008-11-12T00:57:22.000Z

[jgm]

Or mueval, for more safety.

Google Code Info:
Author: [email protected]
Created On: 2008-11-12T01:06:34.000Z

[jgm]

Example of use of hint, in ghci:

:m + Language.Haskell.Interpreter.GHC
:m + Text.Pandoc
inp <- readFile "README"
let y = withSession ses (setImports ["Text.Pandoc","Prelude"] >> (interpret
("writeLaTeX defaultWriterOptions $ readMarkdown defaultParserState $ " ++ show inp)
(as :: Pandoc)))
y

Google Code Info:
Author: [email protected]
Created On: 2008-11-13T07:04:02.000Z

[jgm]

Note: the example above is missing
ses <- newSession
also try this:

:m + Control.Monad.Errors
e <- withSession ses (setImports ["Prelude"] >> (catchError (interpret "(+)" (as ::
Int -> Int)) (\e -> return id)))
e 2
4
e <- withSession sess (setImports ["Prelude","Text.Pandoc"] >> (interpret
"processPandoc (const Space)" (as :: Pandoc -> Pandoc)))
e $ Pandoc (Meta [] [] []) [Para [Str "Hi",Space,Emph [Str "there"]]]
Pandoc (Meta [] [] "") [Para [Space,Space,Space]]

Google Code Info:
Author: [email protected]
Created On: 2008-11-14T07:30:47.000Z

[jgm]

This is fun:
-- MyMod.hs
module MyMod (doit) where
import Text.Pandoc

doit :: Inline -> Inline
doit (Str x) = Str (x ++ "!")
doit x = x

-- GHCI:
GHCI> e <- withSession sess (loadModules ["MyMod"] >> setImports
["Prelude","Text.Pandoc","MyMod"] >> (catchError (interpret "processPandoc doit" (as
:: Pandoc -> Pandoc)) (\e -> throwError e >> return id)))
GHCI> e $ Pandoc (Meta [] [] []) [Para [Str "Hi",Space,Emph [Str "there"]]]
Pandoc (Meta [] [] "") [Para [Str "Hi!",Space,Emph [Str "there!"]]]

Google Code Info:
Author: [email protected]
Created On: 2008-11-14T07:44:03.000Z

[jgm]

The newest release of hint supports GHC 6.10.
Time to get going on this!

Google Code Info:
Author: [email protected]
Created On: 2009-01-01T05:02:50.000Z

[jgm]

Or mueval, for more safety.

Mueval might work as a library, with some modification to the internal API. But given
that the code is either A) supplied by the developers and presumably vetted and
checked; or B) written by the user who has incentive to not write evil code, mueval
may be the wrong solution.

It is also relatively inefficient compared to running Hint directly, due to the
resource-limiting, process-level and thread-level watchdogs, checks to sanitize the
code, etc. That's fine for running potentially-evil code since the alternative to
running slowly & safely is not running at all.

I would suggest Hint instead of Mueval. It is pleasant to use & Daniel Gorin has
always responded quickly to my needs (for mueval development), and I don't foresee it
being abandoned anytime soon. (It certainly is currently a better solution than
hs-plugins inasmuch as the latter does not even work on 6.10.)

Google Code Info:
Author: [email protected]
Created On: 2009-01-23T21:47:21.000Z

[jgm]

Actually, I've already got all the plugin stuff written, using hint.
I've just been waiting for Daniel to upload the latest version (which
he did today), since the old version didn't cabal install under ghc 6.8.

So you should see the plugin stuff, including some worked-out examples,
in the repository before too long!

Google Code Info:
Author: [email protected]
Created On: 2009-01-24T02:29:59.000Z

[jgm]

Added as of r1526.

Google Code Info:
Author: [email protected]
Created On: 2009-01-24T20:01:26.000Z