2 files changed, 21 insertions, 1 deletions
diff --git a/haddock-test/src/Test/Haddock.hs b/haddock-test/src/Test/Haddock.hs
index 78204840..a2c6609a 100644
--- a/haddock-test/src/Test/Haddock.hs
+++ b/haddock-test/src/Test/Haddock.hs
@@ -29,7 +29,11 @@ data CheckResult
 
 
 runAndCheck :: Config c -> IO ()
-runAndCheck cfg = runHaddock cfg >> checkFiles cfg
+runAndCheck cfg = do
+    runHaddock cfg
+    if cfgAccept cfg
+        then acceptFiles cfg
+        else checkFiles cfg
 
 
 checkFiles :: Config c -> IO ()
@@ -55,6 +59,16 @@ checkFiles cfg@(Config { .. }) = do
             exitFailure
 
 
+acceptFiles :: Config c -> IO ()
+acceptFiles (Config { cfgFiles = files, cfgDirConfig = dcfg }) = do
+
+    forM_ files $ \file -> do
+        let mdl = takeBaseName file
+        putStr $ "Accepting " ++ mdl ++ "... "
+        copyFile (outFile dcfg mdl) (refFile dcfg mdl)
+        putStrLn "DONE"
+
+
 maybeDiff :: Config c -> [String] -> IO ()
 maybeDiff (Config { cfgDiffTool = Nothing }) _ = pure ()
 maybeDiff cfg@(Config { cfgDiffTool = (Just diff) }) mdls = do
diff --git a/haddock-test/src/Test/Haddock/Config.hs b/haddock-test/src/Test/Haddock/Config.hs
index 4f6bb818..451cd809 100644
--- a/haddock-test/src/Test/Haddock/Config.hs
+++ b/haddock-test/src/Test/Haddock/Config.hs
@@ -68,6 +68,7 @@ data Config c = Config
     , cfgHaddockStdOut :: FilePath
     , cfgDiffTool :: Maybe FilePath
     , cfgEnv :: Environment
+    , cfgAccept :: Bool
     , cfgCheckConfig :: CheckConfig c
     , cfgDirConfig :: DirConfig
     }
@@ -87,6 +88,7 @@ data Flag
     | FlagHaddockStdOut FilePath
     | FlagDiffTool FilePath
     | FlagNoDiff
+    | FlagAccept
     | FlagHelp
     deriving Eq
 
@@ -118,6 +120,8 @@ options =
         "where to redirect Haddock output"
     , Option [] ["diff-tool"] (ReqArg FlagDiffTool "PATH")
         "diff tool to use when printing failed cases"
+    , Option ['a'] ["accept"] (NoArg FlagAccept)
+        "accept generated output"
     , Option [] ["no-diff"] (NoArg FlagNoDiff)
         "do not print diff for failed cases"
     , Option ['h'] ["help"] (NoArg FlagHelp)
@@ -178,6 +182,8 @@ loadConfig ccfg dcfg flags files = do
         then pure Nothing
         else (<|>) <$> pure (flagsDiffTool flags) <*> defaultDiffTool
 
+    let cfgAccept = FlagAccept `elem` flags
+
     let cfgCheckConfig = ccfg
     let cfgDirConfig = dcfg