summaryrefslogtreecommitdiff
path: root/RemoteLog.hs
blob: c2065db9da2a6d9a8ae235e47c47624601bac0bf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
{- git-annex remote log
 - 
 - Copyright 2011 Joey Hess <joey@kitenet.net>
 - 
 - Licensed under the GNU GPL version 3 or higher.
 -}

module RemoteLog (
	remoteLog,
	readRemoteLog,
	configSet,
	keyValToConfig,
	configToKeyVal,

	prop_idempotent_configEscape
) where

import Data.List
import qualified Data.Map as M
import Data.Maybe
import Data.Char

import qualified Branch
import Types
import Types.Remote
import UUID

{- Filename of remote.log. -}
remoteLog :: FilePath
remoteLog = "remote.log"

{- Adds or updates a remote's config in the log. -}
configSet :: UUID -> RemoteConfig -> Annex ()
configSet u c = do
	m <- readRemoteLog
	Branch.change remoteLog $ unlines $ sort $
		map toline $ M.toList $ M.insert u c m
	where
		toline (u', c') = u' ++ " " ++ (unwords $ configToKeyVal c')

{- Map of remotes by uuid containing key/value config maps. -}
readRemoteLog :: Annex (M.Map UUID RemoteConfig)
readRemoteLog = return . remoteLogParse =<< Branch.get remoteLog

remoteLogParse :: String -> M.Map UUID RemoteConfig
remoteLogParse s =
	M.fromList $ catMaybes $ map parseline $ filter (not . null) $ lines s
	where
		parseline l
			| length w > 2 = Just (u, c)
			| otherwise = Nothing
			where
				w = words l
				u = w !! 0
				c = keyValToConfig $ tail w

{- Given Strings like "key=value", generates a RemoteConfig. -}
keyValToConfig :: [String] -> RemoteConfig
keyValToConfig ws = M.fromList $ map (/=/) ws
	where
		(/=/) s = (k, v)
			where
				k = takeWhile (/= '=') s
				v = configUnEscape $ drop (1 + length k) s

configToKeyVal :: M.Map String String -> [String]
configToKeyVal m = map toword $ sort $ M.toList m
	where
		toword (k, v) = k ++ "=" ++ configEscape v

configEscape :: String -> String
configEscape = (>>= escape)
	where
		escape c
			| isSpace c || c `elem` "&" = "&" ++ show (ord c) ++ ";"
			| otherwise = [c]

configUnEscape :: String -> String
configUnEscape = unescape
	where
		unescape [] = []
		unescape (c:rest)
			| c == '&' = entity rest
			| otherwise = c : unescape rest
		entity s = if ok
				then chr (read num) : unescape rest
				else '&' : unescape s
			where
				num = takeWhile isNumber s
				r = drop (length num) s
				rest = drop 1 r
				ok = not (null num) && 
					not (null r) && r !! 0 == ';'

{- for quickcheck -}
prop_idempotent_configEscape :: String -> Bool
prop_idempotent_configEscape s = s == (configUnEscape $ configEscape s)