3 files changed, 31 insertions, 8 deletions

diff --git a/compiler/app/Main.hs b/compiler/app/Main.hs
index 1a42abf..4dd6660 100644
--- a/compiler/app/Main.hs
+++ b/compiler/app/Main.hs
@@ -31,6 +31,7 @@ data Options = Options
   { inputDir :: String
   , outputDir :: String
   , rebuilAll :: Bool
+  , cleanOutput :: Bool
   , withViewer :: Bool
   } deriving (Show, Data, Typeable)
 
@@ -53,6 +54,11 @@ options = Options
       &= name "rebuild-all"
       &= explicit
       &= help "Invalidate cache and recompile everything"
+  , cleanOutput = False
+      &= name "c"
+      &= name "clean-output"
+      &= explicit
+      &= help "Remove unnecessary files from the output directory"
   , withViewer = False
       &= name "w"
       &= name "with-viewer"
@@ -71,10 +77,23 @@ main :: IO ()
 main =
   do
     opts <- cmdArgs options
-    compileGallery (inputDir opts) (galleryOutputDir "gallery" opts) (rebuilAll opts)
-    if (withViewer opts) then copyViewer (outputDir opts) else noop
+
+    buildGallery opts
+
+    if (withViewer opts) then
+      copyViewer (outputDir opts)
+    else
+      return ()
 
   where
+    buildGallery :: Options -> IO ()
+    buildGallery opts =
+      compileGallery
+        (inputDir opts)
+        (galleryOutputDir "gallery" opts)
+        (rebuilAll opts)
+        (cleanOutput opts)
+
     galleryOutputDir :: FilePath -> Options -> FilePath
     galleryOutputDir gallerySubdir opts =
       if withViewer opts then outputBase </> gallerySubdir else outputBase
@@ -86,6 +105,3 @@ main =
       >>  getDataFileName "viewer"
       >>= readDirectory
       >>= copyTo target
-
-    noop :: IO ()
-    noop = return ()
diff --git a/compiler/src/Compiler.hs b/compiler/src/Compiler.hs
index 27598b7..fc40a76 100644
--- a/compiler/src/Compiler.hs
+++ b/compiler/src/Compiler.hs
@@ -102,8 +102,8 @@ galleryDirFilter config =
       any (matchesFile (== indexFile) ||| matchesFile (== viewerMainFile)) items
 
 
-compileGallery :: FilePath -> FilePath -> Bool -> IO ()
-compileGallery inputDirPath outputDirPath rebuildAll =
+compileGallery :: FilePath -> FilePath -> Bool -> Bool -> IO ()
+compileGallery inputDirPath outputDirPath rebuildAll cleanOutput =
   do
     fullConfig <- readConfig inputGalleryConf
     let config = compiler fullConfig
@@ -119,7 +119,11 @@ compileGallery inputDirPath outputDirPath rebuildAll =
     let galleryBuilder = buildGalleryTree itemProc thumbnailProc (tagsFromDirectories config)
     resources <- galleryBuilder (galleryName config) inputTree
 
-    galleryCleanupResourceDir resources outputDirPath
+    if cleanOutput then
+      galleryCleanupResourceDir resources outputDirPath
+    else
+      return ()
+
     writeJSON outputIndex resources
     writeJSON outputViewerConf $ viewer fullConfig
 
diff --git a/ldgallery.1.md b/ldgallery.1.md
index febe2e2..c40a4ce 100644
--- a/ldgallery.1.md
+++ b/ldgallery.1.md
@@ -33,6 +33,9 @@ Available options are:
 -r, \--rebuild-all
 : Invalidate cache and recompile everything.
 
+-c, \--clean-output
+: Remove unnecessary files from the output directory.
+
 -w, \--with-viewer
 : Include the static web viewer in the output.