Create reference files from unpacked archives with helper program

Setup.hs

@@ -22,7 +22,10 @@ import Distribution.PackageDescription (PackageDescription(..), Executable(..))
 import System.Process ( rawSystem )
 import System.FilePath ( (</>) )
 import System.Directory ( findExecutable )
-import Distribution.Simple.Utils (info)
+import Distribution.Simple.Utils (info, rawSystemExit)
+import Distribution.Simple.Setup
+import Distribution.Simple.LocalBuildInfo
+import Distribution.Verbosity
 
 main :: IO ()
 main = defaultMainWithHooks $ simpleUserHooks {
@@ -30,12 +33,15 @@ main = defaultMainWithHooks $ simpleUserHooks {
       hookedPreProcessors = [ppBlobSuffixHandler]
       -- ensure that make-pandoc-man-pages doesn't get installed to bindir
     , copyHook = \pkgdescr ->
-         (copyHook simpleUserHooks) pkgdescr{ executables =
-            [x | x <- executables pkgdescr, exeName x /= "make-pandoc-man-pages"] }
+         copyHook simpleUserHooks pkgdescr{ executables =
+            [x | x <- executables pkgdescr, exeName x `notElem` noInstall] }
     , instHook = \pkgdescr ->
-         (instHook simpleUserHooks) pkgdescr{ executables =
-            [x | x <- executables pkgdescr, exeName x /= "make-pandoc-man-pages"] }
+         instHook simpleUserHooks pkgdescr{ executables =
+            [x | x <- executables pkgdescr, exeName x `notElem` noInstall] }
+    , postBuild = makeReferenceFiles
     }
+  where
+    noInstall = ["make-pandoc-man-pages","make-reference-files"]
 
 ppBlobSuffixHandler :: PPSuffixHandler
 ppBlobSuffixHandler = ("hsb", \_ _ ->
@@ -49,3 +55,13 @@ ppBlobSuffixHandler = ("hsb", \_ _ ->
             Nothing -> error "hsb2hs is needed to build this program: cabal install hsb2hs"
          return ()
   })
+
+makeReferenceFiles :: Args -> BuildFlags -> PackageDescription -> LocalBuildInfo -> IO ()
+makeReferenceFiles _ bf _ LocalBuildInfo{buildDir=buildDir}
+  = mapM_
+      (rawSystemExit verbosity progPath . return)
+      referenceFormats
+  where
+    verbosity = fromFlagOrDefault normal $ buildVerbosity bf
+    progPath = buildDir </> "make-reference-files" </> "make-reference-files"
+    referenceFormats = ["docx", "odt"]

data/make-reference-files.hs

@@ -0,0 +1,26 @@
+import System.Environment
+import System.Directory
+import Codec.Archive.Zip
+import qualified Data.ByteString.Lazy as BS
+import qualified Control.Exception as E
+import System.IO.Error (isDoesNotExistError)
+
+mkzip :: String -> IO ()
+mkzip fmt = do
+  let dir    = "data/"++fmt
+      output = "data/reference."++fmt
+  cd <- getCurrentDirectory
+  setCurrentDirectory dir
+  archive <- addFilesToArchive [OptRecursive] emptyArchive ["."]
+  setCurrentDirectory cd
+  removeIfExists output
+  BS.writeFile output $ fromArchive archive
+
+removeIfExists :: FilePath -> IO ()
+removeIfExists fileName = removeFile fileName `E.catch` handleExists
+  where handleExists e
+          | isDoesNotExistError e = return ()
+          | otherwise = E.throwIO e
+
+main :: IO ()
+main = getArgs >>= mkzip . (!!0)

pandoc.cabal

@@ -418,6 +418,15 @@ Executable make-pandoc-man-pages
   else
     Buildable:   False
 
+Executable make-reference-files
+  Main-Is:       make-reference-files.hs
+  Hs-Source-Dirs: data
+  Build-Depends: zip-archive >= 0.2.3.4 && < 0.3,
+                 base >= 4.2 && < 5,
+                 directory >= 1 && < 1.3,
+                 bytestring >= 0.9 && < 0.11
+  Default-Language: Haskell2010
+
 Test-Suite test-pandoc
   Type:           exitcode-stdio-1.0
   Main-Is:        test-pandoc.hs