Fix warnings in utils/OrdList

[ghc-hetmet.git] / compiler / utils / Pretty.lhs

diff --git a/compiler/utils/Pretty.lhs b/compiler/utils/Pretty.lhs
index ab13e3e..9c94c8e 100644 (file)
--- a/compiler/utils/Pretty.lhs
+++ b/compiler/utils/Pretty.lhs
@@ -152,11 +152,11 @@ Relative to John's original paper, there are the following new features:
 
 
 \begin{code}
-{-# OPTIONS_GHC -w #-}
+{-# OPTIONS -w #-}
 -- The above warning supression flag is a temporary kludge.
 -- While working on this module you are encouraged to remove it and fix
 -- any warnings in the module. See
---     http://hackage.haskell.org/trac/ghc/wiki/WorkingConventions#Warnings
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
 -- for details
 
 module Pretty (
@@ -989,26 +989,29 @@ display mode IBOX(page_width) IBOX(ribbon_width) txt end doc
 
                     other -> lay1 k s sl p
     
-        lay1 k s sl p = Str (indent k) `txt` (s `txt` lay2 (k PLUS sl) p)
+        lay1 k s sl p = indent k (s `txt` lay2 (k PLUS sl) p)
     
         lay2 k (NilAbove p)        = nl_text `txt` lay k p
         lay2 k (TextBeside s sl p) = s `txt` (lay2 (k PLUS sl) p)
         lay2 k (Nest _ p)          = lay2 k p
         lay2 k Empty               = end
+
+        -- optimise long indentations using LitString chunks of 8 spaces
+        indent n r | n GREQ ILIT(8) = LStr "        "# 8# `txt` 
+                                      indent (n MINUS ILIT(8)) r
+                   | otherwise      = Str (spaces n) `txt` r
     in
     lay ILIT(0) doc
     }}
 
 cant_fail = error "easy_display: NoDoc"
 
-indent n | n GREQ ILIT(8) = '\t' : indent (n MINUS ILIT(8))
-         | otherwise      = spaces n
-
 multi_ch n ch | n LTEQ ILIT(0) = ""
              | otherwise      = ch : multi_ch (n MINUS ILIT(1)) ch
 
 spaces n | n LTEQ ILIT(0) = ""
          | otherwise      = ' ' : spaces (n MINUS ILIT(1))
+
 \end{code}
 
 \begin{code}