fully preserve input format of connect and disconnect commands
Just lifted the sim file as a DSL into the type level for that.
This commit is contained in:
Joey Hess
parent
f381b457f2
commit
7b931df475
3 changed files with 148 additions and 95 deletions
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@ -20,15 +20,15 @@ import Text.Read
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parseSimFile :: String -> Either String [SimCommand]
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parseSimFile = go [] . lines
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where
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go c [] = Right c
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go c (l:ls) = case parseSimFileLine l of
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Right cs -> go (c ++ cs) ls
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go cs [] = Right (reverse cs)
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go cs (l:ls) = case parseSimFileLine l of
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Right command -> go (command:cs) ls
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Left err -> Left err
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parseSimFileLine :: String -> Either String [SimCommand]
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parseSimFileLine :: String -> Either String SimCommand
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parseSimFileLine s
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| "#" `isPrefixOf` s = Right [CommandComment s]
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| all isSpace s = Right [CommandBlank]
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| "#" `isPrefixOf` s = Right (CommandComment s)
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| all isSpace s = Right (CommandBlank)
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| otherwise = parseSimCommand (words s)
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generateSimFile :: [SimCommand] -> String
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@ -41,10 +41,10 @@ generateSimFile = unlines . map unwords . go
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["initremote", name] : go rest
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go (CommandUse (RepoName name) what : rest) =
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["use", name, what] : go rest
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go (CommandConnect (RepoName name) (RemoteName remote) : rest) =
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handleconnect name remote rest
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go (CommandDisconnect (RepoName name) (RemoteName remote) : rest) =
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["disconnect", name, "->", remote] : go rest
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go (CommandConnect c : rest) =
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("connect":formatConnections c) : go rest
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go (CommandDisconnect c : rest) =
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("disconnect":formatConnections c) : go rest
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go (CommandAddTree (RepoName name) expr : rest) =
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["addtree", name, expr] : go rest
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go (CommandAdd f sz repos : rest) =
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@ -98,117 +98,123 @@ generateSimFile = unlines . map unwords . go
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go (CommandBlank : rest) =
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[""] : go rest
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handleconnect name remote (CommandConnect (RepoName name2) (RemoteName remote2) : rest)
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| name == remote2 && name2 == remote =
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let (chain, rest') = chainconnect remote rest
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in (["connect", name, "<->", remote] ++ chain) : go rest'
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handleconnect name remote rest =
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["connect", name, "->", remote] : go rest
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chainconnect name (CommandConnect (RepoName name2) (RemoteName remote2) : rest)
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| name == name2 = case rest of
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(CommandConnect (RepoName name3) (RemoteName remote3) : rest')
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| remote2 == name3 ->
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let (chain, rest'') = chainconnect remote3 rest'
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in (["<->", remote2] ++ chain, rest'')
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_ ->
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let (chain, rest') = chainconnect remote2 rest
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in (["->", remote2] ++ chain, rest')
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chainconnect _ rest = ([], rest)
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showsize = filter (not . isSpace) . preciseSize storageUnits True
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parseSimCommand :: [String] -> Either String [SimCommand]
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parseSimCommand :: [String] -> Either String SimCommand
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parseSimCommand ("init":name:[]) =
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Right [CommandInit (RepoName name)]
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Right $ CommandInit (RepoName name)
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parseSimCommand ("initremote":name:[]) =
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Right [CommandInitRemote (RepoName name)]
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Right $ CommandInitRemote (RepoName name)
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parseSimCommand ("use":name:rest) =
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Right [CommandUse (RepoName name) (unwords rest)]
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parseSimCommand ("connect":rest) =
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parseConnect CommandConnect rest
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Right $ CommandUse (RepoName name) (unwords rest)
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parseSimCommand ("connect":rest) =
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CommandConnect <$> parseConnections rest
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parseSimCommand ("disconnect":rest) =
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parseConnect CommandDisconnect rest
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CommandDisconnect <$> parseConnections rest
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parseSimCommand ("addtree":name:rest) =
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Right [CommandAddTree(RepoName name) (unwords rest)]
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Right $ CommandAddTree(RepoName name) (unwords rest)
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parseSimCommand ("add":filename:size:repos) =
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case readSize dataUnits size of
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Just sz -> Right [CommandAdd (toRawFilePath filename) sz (map RepoName repos)]
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Just sz -> Right $ CommandAdd
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(toRawFilePath filename)
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sz
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(map RepoName repos)
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Nothing -> Left $ "Unable to parse file size \"" ++ size ++ "\""
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parseSimCommand ("step":n:[]) =
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case readMaybe n of
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Just n' -> Right [CommandStep n']
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Just n' -> Right $ CommandStep n'
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Nothing -> Left $ "Unable to parse step value \"" ++ n ++ "\""
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parseSimCommand ("action":repo:"pull":remote:[]) =
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Right [CommandAction (RepoName repo) (ActionPull (RemoteName remote))]
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Right $ CommandAction (RepoName repo)
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(ActionPull (RemoteName remote))
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parseSimCommand ("action":repo:"push":remote:[]) =
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Right [CommandAction (RepoName repo) (ActionPush (RemoteName remote))]
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Right $ CommandAction (RepoName repo)
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(ActionPush (RemoteName remote))
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parseSimCommand ("action":repo:"getwanted":remote:[]) =
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Right [CommandAction (RepoName repo) (ActionGetWanted (RemoteName remote))]
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Right $ CommandAction (RepoName repo)
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(ActionGetWanted (RemoteName remote))
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parseSimCommand ("action":repo:"dropunwanted":[]) =
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Right [CommandAction (RepoName repo) (ActionDropUnwanted Nothing)]
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Right $ CommandAction (RepoName repo)
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(ActionDropUnwanted Nothing)
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parseSimCommand ("action":repo:"dropunwanted":remote:[]) =
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Right [CommandAction (RepoName repo) (ActionDropUnwanted (Just (RemoteName remote)))]
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Right $ CommandAction (RepoName repo)
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(ActionDropUnwanted (Just (RemoteName remote)))
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parseSimCommand ("action":repo:"gitpush":remote:[]) =
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Right [CommandAction (RepoName repo) (ActionGitPush (RemoteName remote))]
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Right $ CommandAction (RepoName repo)
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(ActionGitPush (RemoteName remote))
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parseSimCommand ("action":repo:"gitpull":remote:[]) =
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Right [CommandAction (RepoName repo) (ActionGitPull (RemoteName remote))]
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Right $ CommandAction (RepoName repo)
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(ActionGitPull (RemoteName remote))
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parseSimCommand ("seed":n:[]) =
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case readMaybe n of
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Just n' -> Right [CommandSeed n']
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Just n' -> Right $ CommandSeed n'
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Nothing -> Left $ "Unable to parse seed value \"" ++ n ++ "\""
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parseSimCommand ("present":repo:file:[]) =
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Right [CommandPresent (RepoName repo) (toRawFilePath file)]
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Right $ CommandPresent (RepoName repo) (toRawFilePath file)
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parseSimCommand ("notpresent":repo:file:[]) =
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Right [CommandNotPresent (RepoName repo) (toRawFilePath file)]
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Right $ CommandNotPresent (RepoName repo) (toRawFilePath file)
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parseSimCommand ("numcopies":n:[]) =
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case readMaybe n of
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Just n' -> Right [CommandNumCopies n']
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Just n' -> Right $ CommandNumCopies n'
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Nothing -> Left $ "Unable to parse numcopies value \"" ++ n ++ "\""
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parseSimCommand ("mincopies":n:[]) =
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case readMaybe n of
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Just n' -> Right [CommandMinCopies n']
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Just n' -> Right $ CommandMinCopies n'
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Nothing -> Left $ "Unable to parse mincopies value \"" ++ n ++ "\""
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parseSimCommand ("trustlevel":repo:s:[]) =
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case readTrustLevel s of
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Just trustlevel -> Right [CommandTrustLevel (RepoName repo) trustlevel]
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Just trustlevel -> Right $
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CommandTrustLevel (RepoName repo) trustlevel
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Nothing -> Left $ "Unknown trust level \"" ++ s ++ "\"."
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parseSimCommand ("group":repo:group:[]) =
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Right [CommandGroup (RepoName repo) (toGroup group)]
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Right $ CommandGroup (RepoName repo) (toGroup group)
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parseSimCommand ("ungroup":repo:group:[]) =
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Right [CommandUngroup (RepoName repo) (toGroup group)]
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Right $ CommandUngroup (RepoName repo) (toGroup group)
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parseSimCommand ("wanted":repo:expr) =
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Right [CommandWanted (RepoName repo) (unwords expr)]
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Right $ CommandWanted (RepoName repo) (unwords expr)
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parseSimCommand ("required":repo:expr) =
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Right [CommandRequired (RepoName repo) (unwords expr)]
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Right $ CommandRequired (RepoName repo) (unwords expr)
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parseSimCommand ("groupwanted":group:expr) =
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Right [CommandGroupWanted (toGroup group) (unwords expr)]
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Right $ CommandGroupWanted (toGroup group) (unwords expr)
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parseSimCommand ("maxsize":repo:size:[]) =
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case readSize dataUnits size of
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Just sz -> Right [CommandMaxSize (RepoName repo) (MaxSize sz)]
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Just sz -> Right $ CommandMaxSize (RepoName repo) (MaxSize sz)
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Nothing -> Left $ "Unable to parse maxsize \"" ++ size ++ "\""
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parseSimCommand ("rebalance":onoff:[]) = case isTrueFalse onoff of
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Just b -> Right [CommandRebalance b]
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Just b -> Right $ CommandRebalance b
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Nothing -> Left $ "Unable to parse rebalance value \"" ++ onoff ++ "\""
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parseSimCommand ws = Left $ "Unable to parse sim command: \"" ++ unwords ws ++ "\""
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parseConnect :: (RepoName -> RemoteName -> SimCommand) -> [String] -> Either String [SimCommand]
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parseConnect mk = go []
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parseConnections :: [String] -> Either String Connections
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parseConnections = go . reverse
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where
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go c [] = Right (reverse c)
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go c (r1:"->":r2:rest) =
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go (mk (RepoName r1) (RemoteName r2):c)
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(chain r2 rest)
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go c (r1:"<-":r2:rest) =
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go (mk (RepoName r2) (RemoteName r1):c)
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(chain r2 rest)
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go c (r1:"<->":r2:rest) =
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go (mk (RepoName r2) (RemoteName r1)
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: mk (RepoName r1) (RemoteName r2)
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: c
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)
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(chain r2 rest)
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go _ rest = Left $ "Bad connect syntax near \"" ++ unwords rest ++ "\""
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go (r2:"->":r1:rest) =
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chain (RepoName r1 :-> RemoteName r2) rest
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go (r2:"<-":r1:rest) =
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chain (RemoteName r1 :<- RepoName r2) rest
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go (r2:"<->":r1:rest) =
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chain (RepoName r1 :<-> RepoName r2) rest
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go rest = bad rest
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chain v rest = if null rest then rest else v:rest
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chain c [] = Right c
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chain c ("->":r:rest) = chain (RepoName r :=> c) rest
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chain c ("<-":r:rest) = chain (RemoteName r :<= c) rest
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chain c ("<->":r:rest) = chain (RepoName r :<=> c) rest
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chain _ rest = bad rest
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bad rest = Left $ "Bad connect syntax near \"" ++ unwords rest ++ "\""
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formatConnections :: Connections -> [String]
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formatConnections (RepoName repo :-> RemoteName remote) =
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[repo, "->", remote]
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formatConnections (RemoteName remote :<- RepoName repo) =
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[remote, "<-", repo]
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formatConnections (RepoName repo1 :<-> RepoName repo2) =
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[repo1, "<->", repo2]
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formatConnections (RepoName repo :=> c) =
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repo : "->" : formatConnections c
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formatConnections (RemoteName remote :<= c) =
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remote : "<-" : formatConnections c
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formatConnections (RepoName repo :<=> c) =
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repo : "<->" : formatConnections c
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