Added 'library' and 'executable' configuration flags.

Cabal can now be told to build just the library or just the executable.
Updated INSTALL accordingly.


git-svn-id: https://pandoc.googlecode.com/svn/trunk@1346 788f1e2b-df1e-0410-8736-df70ead52e1b

INSTALL

@@ -118,6 +118,13 @@ Just download the source tarball, unpack, and type:
 This will install the pandoc executable and the Haskell libraries,
 but not the shell scripts, man pages, or other documentation.
 
+You may just want the executable, or just the libraries.  This
+can be controlled with configuration flags (the `-` negates the
+flag):
+
+    runhaskell Setup.hs configure -f-library      # just the executable
+    runhaskell Setup.hs configure -f-executable   # just the libraries
+
 Note:  If you are using GHC 6.6.*, you will need to start by
 replacing `pandoc.cabal` with a version suitable for GHC 6.6:
 

pandoc.cabal

@@ -64,6 +64,12 @@ Flag splitBase
 Flag highlighting
   Description:   Compile in support for syntax highlighting of code blocks.
   Default:       False
+Flag executable
+  Description:   Build the pandoc executable.
+  Default:       True
+Flag library
+  Description:   Build the pandoc library.
+  Default:       True
 
 Library
   if flag(splitBase)
@@ -107,8 +113,18 @@ Library
   Ghc-Options:     -O2 -Wall -threaded
   Ghc-Prof-Options: -auto-all
 
+  if flag(library)
+    Buildable:      True
+  else
+    Buildable:      False
+
 Executable pandoc
   Hs-Source-Dirs:     .
   Main-Is:            Main.hs
   Ghc-Options:        -O2 -Wall -threaded
   Ghc-Prof-Options:   -auto-all
+
+  if flag(executable)
+    Buildable:      True
+  else
+    Buildable:      False