system command pipes (sp)

src-3.0/GF/Command/Abstract.hs

@@ -20,6 +20,7 @@ data Option
 data Value
   = VId  Ident
   | VInt Integer
+  | VStr String
   deriving (Eq,Ord,Show)
 
 data Argument
@@ -38,6 +39,11 @@ valIntOpts flag def opts = fromInteger $ case valOpts flag (VInt def) opts of
   VInt v -> v
   _      -> def
 
+valStrOpts :: String -> String -> [Option] -> String
+valStrOpts flag def opts = case valOpts flag (VStr def) opts of
+  VStr v -> v
+  _      -> def
+
 valOpts :: String -> Value -> [Option] -> Value
 valOpts flag def opts = case lookup flag flags of
   Just v -> v

src-3.0/GF/Command/Commands.hs

@@ -29,6 +29,7 @@ import GF.Data.Operations
 
 import Data.Maybe
 import qualified Data.Map as Map
+import System
 
 type CommandOutput = ([Exp],String) ---- errors, etc
 
@@ -403,6 +404,26 @@ allCommands pgf = Map.fromList [
        ("number","the maximum number of questions")
        ] 
      }),
+  ("sp", emptyCommandInfo {
+     longname = "system_pipe",
+     synopsis = "send argument to a system command",
+     syntax   = "sp -command=\"SYSTEMCOMMAND\" STRING",
+     exec = \opts arg -> do
+       let tmpi = "_tmpi" ---
+       let tmpo = "_tmpo"
+       writeFile tmpi $ toString arg
+       let syst = optComm opts ++ " " ++ tmpi
+       system $ syst ++ " <" ++ tmpi ++ " >" ++ tmpo 
+       s <- readFile tmpo
+       return $ fromString s,
+     flags = [
+       ("command","the system command applied to the argument")
+       ],
+     examples = [
+       "ps -command=\"wc\" \"foo\"",
+       "gt | l | sp -command=\"grep \\\"who\\\"\" | sp -command=\"wc\""
+       ]
+     }),
   ("ut", emptyCommandInfo {
      longname = "unicode_table",
      synopsis = "show a transliteration table for a unicode character set",
@@ -458,6 +479,7 @@ allCommands pgf = Map.fromList [
      lang -> chunks ',' lang
    optLang opts = head $ optLangs opts ++ ["#NOLANG"] 
    optCat opts = valIdOpts "cat" (lookStartCat pgf) opts
+   optComm opts = valStrOpts "command" "" opts
    optNum opts = valIntOpts "number" 1 opts
    optNumInf opts = valIntOpts "number" 1000000000 opts ---- 10^9
 

src-3.0/GF/Command/Parse.hs

@@ -32,9 +32,11 @@ pOption = do
   RP.option (OOpt flg) (fmap (OFlag flg) (RP.char '=' >> pValue))
 
 pValue = do
-  fmap VId  pFilename
-  RP.<++
   fmap (VInt . read) (RP.munch1 isDigit)
+  RP.<++
+  fmap VStr pStr
+  RP.<++
+  fmap VId  pFilename
 
 pFilename = liftM2 (:) (RP.satisfy isFileFirst) (RP.munch (not . isSpace)) where
   isFileFirst c = not (isSpace c) && not (isDigit c)