blob: b2b1ee102782bf454b33078c620748e6524fa20d (
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
|
-- ldgallery - A static generator which turns a collection of tagged
-- pictures into a searchable web gallery.
--
-- Copyright (C) 2019-2020 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/>.
module Caching
( Cache
, skipCache
, withCache
) where
import Control.Monad (when)
import System.Directory (removePathForcibly, doesDirectoryExist, doesFileExist)
import FileProcessors (FileProcessor)
import Files
type Cache = FileProcessor -> FileProcessor
skipCache :: Cache
skipCache processor inputPath outputPath =
removePathForcibly outputPath
>> processor inputPath outputPath
withCache :: Cache
withCache processor inputPath outputPath =
do
isDir <- doesDirectoryExist outputPath
when isDir $ removePathForcibly outputPath
fileExists <- doesFileExist outputPath
if fileExists then
do
needUpdate <- isOutdated True inputPath outputPath
if needUpdate then update else skip
else
update
where
update = processor inputPath outputPath
skip = putStrLn $ "Skipping:\t" ++ outputPath
|