avoid pretty-show with GHC < 7.4; update tested-with (fixes #155)

hledger builds with GHC 7.2 through 7.8. 7.0 is not supported
because we require shakespeare which requires the DeriveGeneric extension.

hledger-lib/Hledger/Utils.hs

@@ -24,7 +24,9 @@ module Hledger.Utils (---- provide these frequently used modules - or not, for c
                           -- module Data.PPrint,
                           -- module Hledger.Utils.UTF8IOCompat
                           SystemString,fromSystemString,toSystemString,error',userError',
+#if __GLASGOW_HASKELL__ >= 704
                           ppShow
+#endif
                           -- the rest need to be done in each module I think
                           )
 where
@@ -52,13 +54,20 @@ import Text.ParserCombinators.Parsec
 import Text.Printf
 import Text.Regex.TDFA
 import Text.RegexPR
-import Text.Show.Pretty
 -- import qualified Data.Map as Map
 -- 
 -- import Prelude hiding (readFile,writeFile,appendFile,getContents,putStr,putStrLn)
 -- import Hledger.Utils.UTF8IOCompat   (readFile,writeFile,appendFile,getContents,putStr,putStrLn)
 import Hledger.Utils.UTF8IOCompat (SystemString,fromSystemString,toSystemString,error',userError')
 
+#if __GLASGOW_HASKELL__ >= 704
+import Text.Show.Pretty (ppShow)
+#else
+-- the required pretty-show version requires GHC >= 7.4
+ppShow :: Show a => a -> String
+ppShow = show
+#endif
+
 -- strings
 
 lowercase = map toLower

hledger-lib/hledger-lib.cabal

@@ -17,7 +17,7 @@ author:         Simon Michael <simon@joyful.com>
 maintainer:     Simon Michael <simon@joyful.com>
 homepage:       http://hledger.org
 bug-reports:    http://hledger.org/bugs
-tested-with:    GHC==7.4.2, GHC==7.6.3
+tested-with:    GHC==7.2.2, GHC==7.4.2, GHC==7.6.3, GHC==7.8
 cabal-version:  >= 1.10
 build-type:     Simple
 -- data-dir:       data
@@ -31,6 +31,7 @@ extra-source-files: tests/suite.hs
 library
   -- should set patchlevel here as in Makefile
   cpp-options:    -DPATCHLEVEL=0
+  default-language: Haskell2010
   exposed-modules:
                   Hledger
                   Hledger.Data
@@ -75,7 +76,6 @@ library
                  ,old-locale
                  ,old-time
                  ,parsec
-                 ,pretty-show >= 1.6.4
                  ,regex-tdfa
                  ,regexpr >= 0.5.1
                  ,safe >= 0.2
@@ -84,7 +84,8 @@ library
                  ,transformers >= 0.2 && < 0.4
                  ,utf8-string >= 0.3.5 && < 0.4
                  ,HUnit
-  default-language: Haskell2010
+  if impl(ghc >= 7.4)
+    build-depends: pretty-show >= 1.6.4
 
 source-repository head
   type:     git
@@ -94,6 +95,7 @@ test-suite tests
   type:     exitcode-stdio-1.0
   main-is:  tests/suite.hs
   ghc-options: -Wall
+  default-language: Haskell2010
   build-depends: hledger-lib
                , base >= 4.3 && < 5
                , cmdargs
@@ -107,7 +109,6 @@ test-suite tests
                , old-locale
                , old-time
                , parsec
-               , pretty-show >= 1.6.4
                , regex-tdfa
                , regexpr
                , safe
@@ -116,7 +117,8 @@ test-suite tests
                , test-framework-hunit
                , time
                , transformers
-  default-language: Haskell2010
+  if impl(ghc >= 7.4)
+    build-depends: pretty-show >= 1.6.4
 
 -- cf http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html
 

hledger/hledger.cabal

@@ -18,7 +18,7 @@ author:         Simon Michael <simon@joyful.com>
 maintainer:     Simon Michael <simon@joyful.com>
 homepage:       http://hledger.org
 bug-reports:    http://hledger.org/bugs
-tested-with:    GHC==7.4.2, GHC==7.6.3
+tested-with:    GHC==7.2.2, GHC==7.4.2, GHC==7.6.3, GHC==7.8
 cabal-version:  >= 1.10
 build-type:     Simple
 -- data-dir:       data
@@ -43,6 +43,7 @@ flag threaded
 library
   cpp-options:    -DVERSION="0.22.98"
   ghc-options:    -W
+  default-language: Haskell2010
   -- should be the same as below
   exposed-modules:
                   Hledger.Cli
@@ -86,7 +87,8 @@ library
                  ,time
                  ,utf8-string >= 0.3.5 && < 0.4
                  ,wizards == 1.0.*
-  default-language: Haskell2010
+  if impl(ghc >= 7.4)
+    build-depends: pretty-show >= 1.6.4
 
 -- should depend on the above to avoid double compilation but this is
 -- still too complicated as of 2011/6/1 because:
@@ -119,6 +121,7 @@ executable hledger
   if flag(threaded)
        ghc-options:   -threaded
  -- should be the same as above
+  default-language: Haskell2010
   build-depends:
                   hledger-lib == 0.22.98
                  ,base >= 4.3 && < 5
@@ -143,12 +146,14 @@ executable hledger
                  ,time
                  ,utf8-string >= 0.3.5 && < 0.4
                  ,wizards == 1.0.*
-  default-language: Haskell2010
+  if impl(ghc >= 7.4)
+    build-depends: pretty-show >= 1.6.4
 
 test-suite tests
   type:     exitcode-stdio-1.0
   main-is:  tests/suite.hs
   ghc-options: -Wall
+  default-language: Haskell2010
   build-depends: hledger-lib
                , hledger
                , base >= 4.3 && < 5
@@ -164,7 +169,6 @@ test-suite tests
                , old-locale
                , old-time
                , parsec
-               , pretty-show >= 1.6.4
                , process
                , regexpr
                , safe
@@ -177,4 +181,5 @@ test-suite tests
                , time
                , transformers
                , wizards == 1.0.*
-  default-language: Haskell2010
+  if impl(ghc >= 7.4)
+    build-depends: pretty-show >= 1.6.4