Merge pull request #295 from orlitzky/sdist-manpage

Add a pre-sdist hook to compile the man page (Github issue #247).

Setup.hs

@@ -1,2 +1,43 @@
-import Distribution.Simple
+import Distribution.PackageDescription (
-main = defaultMain
+  HookedBuildInfo,
+  emptyHookedBuildInfo )
+import Distribution.Simple (
+  Args,
+  UserHooks ( preSDist ),
+  defaultMainWithHooks,
+  simpleUserHooks )
+import Distribution.Simple.Setup ( SDistFlags )
+
+-- | This requires the process package from,
+--
+--   https://hackage.haskell.org/package/process
+--
+import System.Process ( callCommand )
+
+
+-- | This will use almost the default implementation, except we switch
+--   out the default pre-sdist hook with our own, 'myPreSDist'.
+--
+main = defaultMainWithHooks myHooks
+  where
+    myHooks = simpleUserHooks { preSDist = myPreSDist }
+
+
+-- | This hook will be executed before e.g. @cabal sdist@. It runs
+--   pandoc to create the man page from shellcheck.1.md. If the pandoc
+--   command is not found, this will fail with an error message:
+--
+--     /bin/sh: pandoc: command not found
+--
+--   Since the man page is listed in the Extra-Source-Files section of
+--   our cabal file, a failure here should result in a failure to
+--   create the distribution tarball (that's a good thing).
+--
+myPreSDist :: Args -> SDistFlags -> IO HookedBuildInfo
+myPreSDist _ _ = do
+  putStrLn "Building the man page..."
+  putStrLn pandoc_cmd
+  callCommand pandoc_cmd
+  return emptyHookedBuildInfo
+  where
+    pandoc_cmd = "pandoc -s -t man shellcheck.1.md -o shellcheck.1"

ShellCheck.cabal

@@ -26,6 +26,8 @@ Extra-Source-Files:
     -- documentation
     README.md
     shellcheck.1.md
+    -- built with a cabal sdist hook
+    shellcheck.1
     -- tests
     test/shellcheck.hs