convert importfeed to youtube-dl

Fully working, including --fast/--relaxed.

Note that, while git-annex addurl --relaxed is not going to check
youtube-dl, I kept git annex importfeed --relaxed checking it.
Thinking is that, let's not break people's importfeed cron jobs, and
importfeed does not typically have to check a large number of new items,
so it's ok if it's a little bit slower when used with youtube playlist
feeds.

importfeed's behavior is also improved (?) when a feed has links in it
to non-media files. Before, those were skipped. Now, the content of the
link is downloaded. This had to be done, because trying to use
youtube-dl is slow, and if those were skipped, it would have to check
every time importfeed was run. While this behavior change may not be
desirable for some feeds, that intersperse links to web pages with
enclosures, it will be desirable for other feeds, that have
non-enclosure directy links to media files.

Remove old quvi modules.

This commit was sponsored by Øyvind Andersen Holm.

Command/AddUrl.hs

@@ -165,7 +165,7 @@ downloadRemoteFile r relaxed uri file sz = checkCanAdd file $ do
 	liftIO $ createDirectoryIfMissing True (parentDir file)
 	ifM (Annex.getState Annex.fast <||> pure relaxed)
 		( do
-			cleanup (Remote.uuid r) loguri file urlkey Nothing
+			addWorkTree (Remote.uuid r) loguri file urlkey Nothing
 			return (Just urlkey)
 		, do
 			-- Set temporary url for the urlkey
@@ -214,46 +214,6 @@ performWeb o url file urlinfo = ifAnnexed file addurl geturl
 	addurl = addUrlChecked (relaxedOption o) url webUUID $ \k -> return $
 		(Url.urlExists urlinfo, Url.urlSize urlinfo == keySize k)
 
-performQuvi :: Bool -> URLString -> URLString -> FilePath -> CommandPerform
-performQuvi relaxed pageurl videourl file = ifAnnexed file addurl geturl
-  where
-	quviurl = setDownloader pageurl QuviDownloader
-	addurl key = next $ do
-		cleanup webUUID quviurl file key Nothing
-		return True
-	geturl = next $ isJust <$> addUrlFileQuvi relaxed quviurl videourl file
-
-addUrlFileQuvi :: Bool -> URLString -> URLString -> FilePath -> Annex (Maybe Key)
-addUrlFileQuvi relaxed quviurl videourl file = checkCanAdd file $ do
-	let key = Backend.URL.fromUrl quviurl Nothing
-	ifM (pure relaxed <||> Annex.getState Annex.fast)
-		( do
-			cleanup webUUID quviurl file key Nothing
-			return (Just key)
-		, do
-			{- Get the size, and use that to check
-			 - disk space. However, the size info is not
-			 - retained, because the size of a video stream
-			 - might change and we want to be able to download
-			 - it later. -}
-			urlinfo <- Url.withUrlOptions (Url.getUrlInfo videourl)
-			let sizedkey = addSizeUrlKey urlinfo key
-			checkDiskSpaceToGet sizedkey Nothing $ do
-				tmp <- fromRepo $ gitAnnexTmpObjectLocation key
-				showOutput
-				ok <- Transfer.notifyTransfer Transfer.Download afile $
-					Transfer.download webUUID key afile Transfer.forwardRetry $ \p -> do
-						liftIO $ createDirectoryIfMissing True (parentDir tmp)
-						downloadUrl key p [videourl] tmp
-				if ok
-					then do
-						cleanup webUUID quviurl file key (Just tmp)
-						return (Just key)
-					else return Nothing
-		)
-  where
-	afile = AssociatedFile (Just file)
-
 addUrlChecked :: Bool -> URLString -> UUID -> (Key -> Annex (Bool, Bool)) -> Key -> CommandPerform
 addUrlChecked relaxed url u checkexistssize key
 	| relaxed = do
@@ -321,7 +281,7 @@ downloadWeb url urlinfo file =
 							pruneTmpWorkDirBefore tmp (liftIO . nukeFile)
 							let dest = takeFileName mediafile
 							showDestinationFile dest
-							cleanup webUUID mediaurl dest mediakey (Just mediafile)
+							addWorkTree webUUID mediaurl dest mediakey (Just mediafile)
 							return $ Right $ Just mediakey
 						Right Nothing -> Right <$> normalfinish tmp
 						Left msg -> return $ Left msg
@@ -379,15 +339,16 @@ finishDownloadWith tmp u url file = do
 	case k of
 		Nothing -> return Nothing
 		Just (key, _) -> do
-			cleanup u url file key (Just tmp)
+			addWorkTree u url file key (Just tmp)
 			return (Just key)
 
 {- Adds the url size to the Key. -}
 addSizeUrlKey :: Url.UrlInfo -> Key -> Key
 addSizeUrlKey urlinfo key = key { keySize = Url.urlSize urlinfo }
 
-cleanup :: UUID -> URLString -> FilePath -> Key -> Maybe FilePath -> Annex ()
-cleanup u url file key mtmp = case mtmp of
+{- Adds worktree file to the repository. -}
+addWorkTree :: UUID -> URLString -> FilePath -> Key -> Maybe FilePath -> Annex ()
+addWorkTree u url file key mtmp = case mtmp of
 	Nothing -> go
 	Just tmp -> do
 		-- Move to final location for large file check.
@@ -418,7 +379,7 @@ nodownload :: URLString -> Url.UrlInfo -> FilePath -> Annex (Maybe Key)
 nodownload url urlinfo file
 	| Url.urlExists urlinfo = do
 		let key = Backend.URL.fromUrl url (Url.urlSize urlinfo)
-		cleanup webUUID url file key Nothing
+		addWorkTree webUUID url file key Nothing
 		return (Just key)
 	| otherwise = do
 		warning $ "unable to access url: " ++ url