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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
-- ldgallery - A static generator which turns a collection of tagged
-- pictures into a searchable web gallery.
--
-- Copyright (C) 2019 Pacien TRAN-GIRARD
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as
-- published by the Free Software Foundation, either version 3 of the
-- License, or (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <https://www.gnu.org/licenses/>.
{-# LANGUAGE
DuplicateRecordFields
, DeriveGeneric
#-}
module Files
( FileName, LocalPath, WebPath, Path
, (</>), (</), (/>), localPath, webPath
, FSNode(..), AnchoredFSNode(..)
, nodePath, nodeName, isHidden, flattenDir, filterDir, readDirectory
, ensureParentDir, remove, isOutdated
) where
import Control.Monad (filterM, mapM)
import Data.Bool (bool)
import Data.List (isPrefixOf, length, deleteBy)
import Data.Function ((&))
import System.Directory
( doesDirectoryExist
, doesPathExist
, getModificationTime
, listDirectory
, createDirectoryIfMissing
, removePathForcibly )
import qualified System.FilePath
import qualified System.FilePath.Posix
type FileName = String
type LocalPath = String
type WebPath = String
-- | Reversed path component list
type Path = [FileName]
(</>) :: Path -> Path -> Path
l </> r = r ++ l
(</) :: Path -> FileName -> Path
path </ file = file:path
(/>) :: FileName -> Path -> Path
file /> path = path ++ [file]
localPath :: Path -> LocalPath
localPath = System.FilePath.joinPath . reverse
webPath :: Path -> WebPath
webPath = System.FilePath.Posix.joinPath . reverse
data FSNode = File Path | Dir Path [FSNode] deriving Show
data AnchoredFSNode = AnchoredFSNode
{ anchor :: LocalPath
, root :: FSNode } deriving Show
nodePath :: FSNode -> Path
nodePath (File path) = path
nodePath (Dir path _) = path
nodeName :: FSNode -> FileName
nodeName = head . nodePath
isHidden :: FSNode -> Bool
isHidden node = "." `isPrefixOf` filename && length filename > 1
where filename = nodeName node
-- | DFS with intermediate dirs first.
flattenDir :: FSNode -> [FSNode]
flattenDir file@(File _) = [file]
flattenDir dir@(Dir _ items) = dir:(concatMap flattenDir items)
-- | Filters a dir tree. The root is always returned.
filterDir :: (FSNode -> Bool) -> AnchoredFSNode -> AnchoredFSNode
filterDir cond (AnchoredFSNode anchor root) =
AnchoredFSNode anchor (filterNode root)
where
filterNode :: FSNode -> FSNode
filterNode file@(File _) = file
filterNode (Dir path items) =
filter cond items & map filterNode & Dir path
readDirectory :: LocalPath -> IO AnchoredFSNode
readDirectory root = mkNode [] >>= return . AnchoredFSNode root
where
mkNode :: Path -> IO FSNode
mkNode path =
(doesDirectoryExist $ localPath (root /> path))
>>= bool (mkFileNode path) (mkDirNode path)
mkFileNode :: Path -> IO FSNode
mkFileNode path = return $ File path
mkDirNode :: Path -> IO FSNode
mkDirNode path =
(listDirectory $ localPath (root /> path))
>>= mapM (mkNode . ((</) path))
>>= return . Dir path
ensureParentDir :: (FileName -> a -> IO b) -> FileName -> a -> IO b
ensureParentDir writer filePath a =
createDirectoryIfMissing True parentDir
>> writer filePath a
where
parentDir = System.FilePath.dropFileName filePath
remove :: FileName -> IO ()
remove path =
do
putStrLn $ "Removing:\t" ++ path
removePathForcibly path
isOutdated :: Bool -> FilePath -> FilePath -> IO Bool
isOutdated onMissingTarget ref target =
do
refExists <- doesPathExist ref
targetExists <- doesPathExist target
if refExists && targetExists then
do
refTime <- getModificationTime ref
targetTime <- getModificationTime target
return (targetTime < refTime)
else
return onMissingTarget
|