Eliminate mutual dependencies between the GF compiler and the PGF library

+ References to modules under src/compiler have been eliminated from the PGF
  library (under src/runtime/haskell). Only two functions had to be moved (from
  GF.Data.Utilities to PGF.Utilities) to make this possible, other apparent
  dependencies turned out to be vacuous.

+ In gf.cabal, the GF executable no longer directly depends on the PGF library
  source directory, but only on the exposed library modules. This means that
  there is less duplication in gf.cabal and that the 30 modules in the
  PGF library will no longer be compiled twice while building GF.

  To make this possible, additional PGF library modules have been exposed, even
  though they should probably be considered for internal use only. They could
  be collected in a PGF.Internal module, or marked as "unstable", to make
  this explicit.

+ Also, by using the -fwarn-unused-imports flag, ~220 redundant imports were
  found and removed, reducing the total number of imports by ~15%.

1 files changed, 9 insertions, 10 deletions

diff --git a/src/compiler/GF/Compile/GrammarToPGF.hs b/src/compiler/GF/Compile/GrammarToPGF.hs
index b8a4f36fa..ce31d5dc1 100644
--- a/src/compiler/GF/Compile/GrammarToPGF.hs
+++ b/src/compiler/GF/Compile/GrammarToPGF.hs
@@ -1,24 +1,23 @@
 {-# LANGUAGE BangPatterns #-}
 module GF.Compile.GrammarToPGF (mkCanon2pgf) where
 
-import GF.Compile.Export
+--import GF.Compile.Export
 import GF.Compile.GeneratePMCFG
 import GF.Compile.GenerateBC
 
-import PGF.CId
+import PGF(CId,mkCId,bsCId)
 import PGF.Data(fidInt,fidFloat,fidString,fidVar)
 import PGF.Optimize(updateProductionIndices)
-import qualified PGF.Macros as CM
+--import qualified PGF.Macros as CM
 import qualified PGF.Data as C
 import qualified PGF.Data as D
 import GF.Grammar.Predef
-import GF.Grammar.Printer
+--import GF.Grammar.Printer
 import GF.Grammar.Grammar
 import qualified GF.Grammar.Lookup as Look
 import qualified GF.Grammar as A
 import qualified GF.Grammar.Macros as GM
-import qualified GF.Infra.Option as O
-import GF.Compile.GeneratePMCFG
+--import GF.Compile.GeneratePMCFG
 
 import GF.Infra.Ident
 import GF.Infra.Option
@@ -26,13 +25,13 @@ import GF.Infra.UseIO (IOE)
 import GF.Data.Operations
 
 import Data.List
-import Data.Char (isDigit,isSpace)
+--import Data.Char (isDigit,isSpace)
 import qualified Data.Set as Set
 import qualified Data.Map as Map
 import qualified Data.IntMap as IntMap
 import Data.Array.IArray
-import Text.PrettyPrint
-import Control.Monad.Identity
+--import Text.PrettyPrint
+--import Control.Monad.Identity
 
 mkCanon2pgf :: Options -> SourceGrammar -> Ident -> IOE D.PGF
 mkCanon2pgf opts gr am = do
@@ -104,7 +103,7 @@ mkCanon2pgf opts gr am = do
           return (seqs, ((m,id), info) : is)
 
 i2i :: Ident -> CId
-i2i = CId . ident2bs
+i2i = bsCId . ident2bs
 
 mkType :: [Ident] -> A.Type -> C.Type
 mkType scope t =