From d510a3ef6c68692f83db09ed17f5be18463e054b Mon Sep 17 00:00:00 2001
From: Oleg Grenrus <oleg.grenrus@iki.fi>
Date: Mon, 10 Sep 2018 19:41:52 +0300
Subject: [PATCH] Guard quickcheck.1 regeneration

Without this guard it will be regenerate on each run,
and cabal new-build considers whole package dirty.
---
 Setup.hs         | 19 +++++++++++++++----
 ShellCheck.cabal |  1 +
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/Setup.hs b/Setup.hs
index 276d8a5..229e8a6 100644
--- a/Setup.hs
+++ b/Setup.hs
@@ -14,6 +14,7 @@ import Distribution.Simple (
 import Distribution.Simple.Setup ( SDistFlags )
 
 import System.Process ( system )
+import System.Directory ( doesFileExist, getModificationTime )
 
 #ifndef MIN_VERSION_cabal_doctest
 #define MIN_VERSION_cabal_doctest(x,y,z) 0
@@ -61,10 +62,20 @@ main = defaultMainWithHooks myHooks
 --
 myPreSDist :: Args -> SDistFlags -> IO HookedBuildInfo
 myPreSDist _ _ = do
-  putStrLn "Building the man page (shellcheck.1) with pandoc..."
-  putStrLn pandoc_cmd
-  result <- system pandoc_cmd
-  putStrLn $ "pandoc exited with " ++ show result
+  exists <- doesFileExist "shellcheck.1"
+  if exists
+  then do
+    source <- getModificationTime "shellcheck.1.md"
+    target <- getModificationTime "shellcheck.1"
+    if target < source
+    then makeManPage
+    else putStrLn "shellcheck.1 is more recent than shellcheck.1.md"
+  else makeManPage
   return emptyHookedBuildInfo
   where
+    makeManPage = do
+      putStrLn "Building the man page (shellcheck.1) with pandoc..."
+      putStrLn pandoc_cmd
+      result <- system pandoc_cmd
+      putStrLn $ "pandoc exited with " ++ show result
     pandoc_cmd = "pandoc -s -t man shellcheck.1.md -o shellcheck.1"
diff --git a/ShellCheck.cabal b/ShellCheck.cabal
index c409704..c28a11e 100644
--- a/ShellCheck.cabal
+++ b/ShellCheck.cabal
@@ -32,6 +32,7 @@ Extra-Source-Files:
 custom-setup
   setup-depends:
     base          >= 4     && <5,
+    directory     >= 1.2   && <1.4,
     process       >= 1.0   && <1.7,
     cabal-doctest >= 1.0.6 && <1.1,
     Cabal         >= 1.10  && <2.5