Add -dppr-colsN to set width of dumps

compiler/main/StaticFlagParser.hs

@@ -122,6 +122,7 @@ static_flags = [
 
         ------ Debugging ----------------------------------------------------
   , Flag "dppr-debug"                  (PassFlag addOpt)
+  , Flag "dppr-cols"                   (AnySuffix addOpt)
   , Flag "dppr-user-length"            (AnySuffix addOpt)
   , Flag "dppr-case-as-let"            (PassFlag addOpt)
   , Flag "dsuppress-all"               (PassFlag addOpt)

compiler/main/StaticFlags.hs

@@ -21,6 +21,7 @@ module StaticFlags (
 
 	-- Output style options
 	opt_PprUserLength,
+	opt_PprCols,
 	opt_PprCaseAsLet,
 	opt_PprStyle_Debug, opt_TraceLevel,
         opt_NoDebugOutput,
@@ -233,8 +234,12 @@ opt_SuppressTypeSignatures
 
 -- | Display case expressions with a single alternative as strict let bindings
 opt_PprCaseAsLet :: Bool
-opt_PprCaseAsLet
-	= lookUp   (fsLit "-dppr-case-as-let")
+opt_PprCaseAsLet		= lookUp   (fsLit "-dppr-case-as-let")
+
+-- | Set the maximum width of the dumps
+opt_PprCols :: Int
+opt_PprCols			= lookup_def_int "-dppr-cols" 100
+
 
 opt_PprStyle_Debug  :: Bool
 opt_PprStyle_Debug              = lookUp  (fsLit "-dppr-debug")

compiler/utils/Pretty.lhs

@@ -185,7 +185,7 @@ import BufWrite
 import FastString
 import FastTypes
 import Panic
-
+import StaticFlags
 import Numeric (fromRat)
 import System.IO
 --import Foreign.Ptr (castPtr)
@@ -999,7 +999,7 @@ spaces n | n <=# _ILIT(0) = ""
 
 \begin{code}
 pprCols :: Int
-pprCols = 100 -- could make configurable
+pprCols = opt_PprCols
 
 printDoc :: Mode -> Handle -> Doc -> IO ()
 printDoc LeftMode hdl doc