Made user directory a Maybe in readFile, s5HeaderIncludes, laTeXMathML.

This is more uniform, and calling libraries can always disable
searching of user directories for overrides.

git-svn-id: https://pandoc.googlecode.com/svn/trunk@1821 788f1e2b-df1e-0410-8736-df70ead52e1b

4 files changed, 11 insertions, 12 deletions

diff --git a/src/Text/Pandoc/LaTeXMathML.hs b/src/Text/Pandoc/LaTeXMathML.hs
index 362e7b084..0c8f74bdf 100644
--- a/src/Text/Pandoc/LaTeXMathML.hs
+++ b/src/Text/Pandoc/LaTeXMathML.hs
@@ -5,7 +5,7 @@ import System.FilePath ( (</>) )
 import Text.Pandoc.Shared (readDataFile)
 
 -- | String containing LaTeXMathML javascript.
-latexMathMLScript :: FilePath -> IO String
+latexMathMLScript :: Maybe FilePath -> IO String
 latexMathMLScript datadir = do
  jsCom <- readDataFile datadir $ "data" </> "LaTeXMathML.js.comment"
  jsPacked <- readDataFile datadir $ "data" </> "LaTeXMathML.js.packed"
diff --git a/src/Text/Pandoc/Shared.hs b/src/Text/Pandoc/Shared.hs
index 5657321d8..14086c20f 100644
--- a/src/Text/Pandoc/Shared.hs
+++ b/src/Text/Pandoc/Shared.hs
@@ -1046,7 +1046,9 @@ inDirectory path action = do
 
 -- | Read file from specified user data directory or, if not found there, from
 -- Cabal data directory.
-readDataFile :: FilePath -> FilePath -> IO String
-readDataFile userDir fname = catch
-  (readFile $ userDir </> fname)
-  (\_ -> getDataFileName fname >>= readFile)
+readDataFile :: Maybe FilePath -> FilePath -> IO String
+readDataFile userDir fname =
+  case userDir of
+       Nothing  -> getDataFileName fname >>= readFile
+       Just u   -> catch (readFile $ u </> fname)
+                   (\_ -> getDataFileName fname >>= readFile)
diff --git a/src/Text/Pandoc/Templates.hs b/src/Text/Pandoc/Templates.hs
index 9f677608d..8fb155c25 100644
--- a/src/Text/Pandoc/Templates.hs
+++ b/src/Text/Pandoc/Templates.hs
@@ -84,7 +84,6 @@ import Text.Pandoc.Shared (readDataFile)
 import Prelude hiding ( readFile )
 import System.IO.UTF8 ( readFile )
 #endif
-import Paths_pandoc (getDataFileName)
 
 -- | Get default template for the specified writer.
 getDefaultTemplate :: (Maybe FilePath) -- ^ User data directory to search first 
@@ -96,9 +95,7 @@ getDefaultTemplate user "odt" = getDefaultTemplate user "opendocument"
 getDefaultTemplate user writer = do
   let format = takeWhile (/='+') writer  -- strip off "+lhs" if present
   let fname = "templates" </> format  <.> "template"
-  E.try $ case user of
-               Just d  -> readDataFile d fname
-               Nothing -> getDataFileName fname >>= readFile
+  E.try $ readDataFile user fname
 
 data TemplateState = TemplateState Int [(String,String)]
 
diff --git a/src/Text/Pandoc/Writers/S5.hs b/src/Text/Pandoc/Writers/S5.hs
index c5b6b05ce..1dff06e62 100644
--- a/src/Text/Pandoc/Writers/S5.hs
+++ b/src/Text/Pandoc/Writers/S5.hs
@@ -44,7 +44,7 @@ import Text.XHtml.Strict
 import System.FilePath ( (</>) )
 import Data.List ( intercalate )
 
-s5HeaderIncludes :: FilePath -> IO String
+s5HeaderIncludes :: Maybe FilePath -> IO String
 s5HeaderIncludes datadir = do
   c <- s5CSS datadir
   j <- s5Javascript datadir
@@ -53,14 +53,14 @@ s5HeaderIncludes datadir = do
 s5Meta :: String
 s5Meta = "<!-- configuration parameters -->\n<meta name=\"defaultView\" content=\"slideshow\" />\n<meta name=\"controlVis\" content=\"hidden\" />\n"
 
-s5Javascript :: FilePath -> IO String
+s5Javascript :: Maybe FilePath -> IO String
 s5Javascript datadir = do
   jsCom <- readDataFile datadir $ "s5" </> "default" </> "slides.js.comment"
   jsPacked <- readDataFile datadir $ "s5" </> "default" </> "slides.js.packed"
   return $ "<script type=\"text/javascript\">\n" ++ jsCom ++ jsPacked ++
            "</script>\n"
 
-s5CSS :: FilePath -> IO String
+s5CSS :: Maybe FilePath -> IO String
 s5CSS datadir = do
   s5CoreCSS <- readDataFile datadir $ "s5" </> "default" </> "s5-core.css"
   s5FramingCSS <- readDataFile datadir $ "s5" </> "default" </> "framing.css"