blob: 7af9ee740831e138ea1cf91fe2be30e9979c71d3 (
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
|
module Cache
( cached,
cachedMaybe,
)
where
import Data.Binary (Binary, decodeFileOrFail, encodeFile)
import Data.Text qualified as T
import Git qualified
import System.Directory (createDirectoryIfMissing, doesFileExist)
import System.FilePath ((</>))
cached :: Binary a => T.Text -> IO a -> IO a
cached key func = do
root <- Git.getRootDir
createDirectoryIfMissing True (root </> ".anissue")
let file = (root </> ".anissue" </> T.unpack key)
doesFileExist file >>= \case
True ->
decodeFileOrFail file >>= \case
Left _ -> generate file
Right blob -> pure blob
False -> generate file
where
generate file = do
blob <- func
encodeFile file blob
pure blob
cachedMaybe :: Binary a => Maybe T.Text -> IO a -> IO a
cachedMaybe Nothing func = func
cachedMaybe (Just key) func = cached key func
|
