Hi Pepe I would have liked something cross-platform. Also, if stmt contains an error, wrapStmt will not be evaluated, and the resulting error is written to standard output or maybe to standard error. Whichever way, I am back to the same problem. Greetings, Mads Lindstrøm
I believe that the trick is to wrap your stmt in a IO handler that captures stdout and returns it together with the value of your stmt. That is, something with a type:
wrapStmt :: IO a -> IO (a,String)
It should be easy to implement wrapStmt using System.Posix.Process. Then you just define
runStmt' session stmt = runStmt session ("wrapStmt $ " ++ stmt)
Good Luck!
On 04/05/2007, at 18:04, Mads Lindstrøm wrote:
Hi
I am trying to use GHC as a library (see http://haskell.org/haskellwiki/GHC/As_a_library ). I want to get all the output from an interactive session and put in a GUI. This http://haskell.org/sitewiki/images/5/51/Interactive.hs seemed to be a nice starting point.
However, the result of:
GHC.runStmt session stmt
does not include the output of evaluating the statement (stmt above) - just the names of bound names. That is if stmt eqauls "3 + 5" then GHC.runStmt do not return a string equaling "8", but just the "it"- name (which is bound to 8).
The output is printed to standard output :( And I do not see and easy way to get hold of it. The only way I see, is having the GUI in one process and "GHC as a library" in another process.
Do anybody know of an easy way to get hold of the output from "GHC as a library" - the output currently printed to standard output?
Greetings,
Mads Lindstrøm
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