#1363: Sourcing multi-line scripts in GHCi: track line numbers, and bail out
after
first error
---------------------------------+------------------------------------------
Reporter: Frederik | Owner:
Type: feature request | Status: new
Priority: normal | Milestone: _|_
Component: GHCi | Version: 6.6
Keywords: multiline script | Testcase:
Blockedby: | Difficulty: Moderate (less than a day)
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
---------------------------------+------------------------------------------
Comment(by vivian):
I think `:script` is better.
It would be nice to have the current line number and input file (or
"<interactive>") threaded through the commands so we can use the same
system for both keyboard interaction and file scripts. The only problem
there is that
{{{
hscParseThing :: (Outputable thing, GhcMonad m)
=> Lexer.P thing
-> DynFlags -> String
-> m thing
-- Nothing => Parse error (message already printed)
-- Just x => success
hscParseThing parser dflags str
= (liftIO $ showPass dflags "Parser") >>
{-# SCC "Parser" #-} do
buf <- liftIO $ stringToStringBuffer str
let loc = mkSrcLoc (fsLit "<interactive>") 1 1
}}}
is polymorphic over `GhcMonad`. `hscParseThing` is where the line number
and 'session name' get used. It does not make sense to store line number
and session name in the Ghc monad, but it does in GHCiState of GHCi monad.
I could write a version of this function specialised for the GHCi monad.
This would require adding fields
{{{
data GHCiState = GHCiState
...
input_file :: Maybe String -- ^ the input file or Nothing =
"<interactive>"
line_number :: Int -- ^ input line number, could be used to
annotate session
-- or track history
...
}}}
and reproducing other code from `GhcMonad`.
Another alternative is to provide versions of {{{HscMain.hs: hscStmt,
hscParse}}} that take additional arguments {{{Int, Maybe String}}}.
Objections? Suggestions?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1363#comment:13>
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