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Add Config.Dyre.Options.removeDyreOptions #7

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This is a pure variant of 'withDyreOptions', which (more importantly) doesn't require a 'Params' argument.

In Yi, we process commandline arguments before running Dyre, and we build the Params based on the result of commandline argument processing. We need removeDyreOptions to write something like this:

yi cfg = do
   args <- getArgs
   let params = processArgs (removeDyreOptions args)
   wrapMain params cfg

Without removeDyreOptions, we are forced to use 'withDyreOptions' with a dummy Params object.

@willdonnelly willdonnelly merged commit 54d3318 into willdonnelly:master
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Commits on Jun 24, 2011
  1. @reinerp
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Showing with 8 additions and 4 deletions.
  1. +8 −4 Config/Dyre/Options.hs
12 Config/Dyre/Options.hs
@@ -17,7 +17,8 @@ control over to a new binary, it gets an argument list which
preserves the important flags with a call to 'customOptions'.
module Config.Dyre.Options
- ( withDyreOptions
+ ( removeDyreOptions
+ , withDyreOptions
, customOptions
, getDenyReconf
, getForceReconf
@@ -34,6 +35,11 @@ import System.Environment.Executable
import Config.Dyre.Params
+-- | Remove all Dyre's options from the given commandline arguments.
+removeDyreOptions :: [String] -> [String]
+removeDyreOptions = filter $ not . prefixElem dyreArgs
+ where prefixElem xs = or . zipWith ($) (map isPrefixOf xs) . repeat
-- | Store Dyre's command-line options to the IO-Store "dyre",
-- and then execute the provided IO action with all Dyre's
-- options removed from the command-line arguments.
@@ -57,9 +63,7 @@ withDyreOptions Params{configCheck = check} action = withStore "dyre" $ do
putValue "dyre" "debugMode" $ "--dyre-debug" `elem` args
-- We filter the arguments, so now Dyre's arguments 'vanish'
- withArgs (filterArgs args) action
- where filterArgs = filter $ not . prefixElem dyreArgs
- prefixElem xs = or . zipWith ($) (map isPrefixOf xs) . repeat
+ withArgs (removeDyreOptions args) action
-- | Get the value of the '--force-reconf' flag, which is used
-- to force a recompile of the custom configuration.
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