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module Backend
( module Backend.CommitHash,
getCommitHashes,
getParentCommitHashOf,
getRootDir,
getFilesOf,
getChangedFilesOf,
Commit (..),
Author (..),
getCommitOf,
readTextFileOfText,
readTextFileOfBS,
resolveRef,
getCommitsBetween,
diffOf,
)
where
import Backend.CommitHash
import Control.Exception (IOException, catch, throwIO)
import Data.Binary (Binary)
import Data.Binary.Instances ()
import Data.ByteString.Lazy qualified as LB
import Data.ByteString.UTF8 qualified as B
import Data.List (sort)
import Data.Maybe (fromMaybe, mapMaybe)
import Data.Tagged
import Data.Text qualified as T
import Data.Text.Encoding qualified as T
import Data.Text.Lazy qualified as LT
import Data.Text.Lazy.Encoding qualified as LT
import Data.Text.Lazy.IO qualified as LT
import Data.Time.Clock (UTCTime, getCurrentTime)
import Data.Time.LocalTime (zonedTimeToUTC)
import Exception qualified as E
import GHC.Generics (Generic)
import Git qualified as Git
import Git.Libgit2 (LgRepo, lgFactory)
import Patch qualified as A
import Process (proc, sh, sh_)
import Safe (headMay)
import Text.Printf (printf)
getCommitHashes :: Maybe CommitHash -> Maybe CommitHash -> IO [CommitHash]
getCommitHashes maybeBottomCommit Nothing =
getCommitHashes maybeBottomCommit (Just WorkingTree)
getCommitHashes (Just WorkingTree) (Just WorkingTree) =
pure [WorkingTree]
getCommitHashes (Just WorkingTree) (Just (Commit _)) =
pure []
getCommitHashes Nothing (Just WorkingTree) =
(WorkingTree :) . map (Commit . Git.renderOid . untag) . reverse
<$> Git.withRepository lgFactory "." do
Just head <- Git.resolveReference "HEAD"
Git.listCommits Nothing (Tagged head)
getCommitHashes (Just (Commit bottomHash)) (Just WorkingTree) =
(WorkingTree :) . map (Commit . Git.renderOid . untag) . reverse
<$> Git.withRepository lgFactory "." do
Just headRef <- Git.resolveReference "HEAD"
bottomRef <- Git.parseOid bottomHash
Git.listCommits (Just (Tagged bottomRef)) (Tagged headRef)
getCommitHashes Nothing (Just (Commit topHash)) =
(WorkingTree :) . map (Commit . Git.renderOid . untag) . reverse
<$> Git.withRepository lgFactory "." do
topRef <- Git.parseOid topHash
Git.listCommits Nothing (Tagged topRef)
getCommitHashes (Just (Commit bottomHash)) (Just (Commit topHash)) =
(WorkingTree :) . map (Commit . Git.renderOid . untag) . reverse
<$> Git.withRepository lgFactory "." do
topRef <- Git.parseOid topHash
bottomRef <- Git.parseOid bottomHash
Git.listCommits (Just (Tagged bottomRef)) (Tagged topRef)
getRootDir :: IO FilePath
getRootDir =
T.unpack . stripTrailingNL
<$> sh (proc "git rev-parse --show-toplevel")
where
stripTrailingNL s = fromMaybe s $ T.stripSuffix "\n" s
getFilesOf :: CommitHash -> IO [FilePath]
getFilesOf WorkingTree =
map T.unpack . T.lines
<$> sh "git ls-files --cached --modified --others --exclude-standard --full-name"
getFilesOf (Commit commit) =
map snd <$> getFilesWithOidOf commit
getChangedFilesOf :: CommitHash -> IO [FilePath]
getChangedFilesOf WorkingTree =
map T.unpack . T.lines
<$> sh "git ls-files --modified --others --exclude-standard --full-name"
getChangedFilesOf (Commit commit) = do
maybeParentCommit <- getParentCommitHashOf (Commit commit)
case maybeParentCommit of
Nothing -> getFilesOf (Commit commit)
Just parentCommit -> do
files <- getFilesWithOidOf commit
parentFiles <- getFilesWithOidOf parentCommit
let addedFiles =
map snd
. filter
( \(_, filePath) ->
all
(\(_, filePath') -> filePath /= filePath')
parentFiles
)
$ files
deletedFiles =
map snd
. filter
( \(_, filePath) ->
all
(\(_, filePath') -> filePath /= filePath')
files
)
$ parentFiles
changedFiles =
[ snd file
| file <- files,
parentFile <- parentFiles,
snd file == snd parentFile,
fst file /= fst parentFile
]
pure $ sort $ addedFiles ++ deletedFiles ++ changedFiles
getParentCommitHashOf :: CommitHash -> IO (Maybe T.Text)
getParentCommitHashOf commitHash =
fmap Git.renderOid
<$> case commitHash of
WorkingTree -> Git.withRepository lgFactory "." do
Git.resolveReference "HEAD"
Commit hash -> Git.withRepository lgFactory "." do
hashRef <- Git.parseOid hash
commit <- Git.lookupCommit (Tagged hashRef)
pure (untag <$> (headMay (Git.commitParents commit)))
getFilesWithOidOf :: T.Text -> IO [(Git.BlobOid LgRepo, FilePath)]
getFilesWithOidOf hash = do
mapMaybe
( \(filePath, treeEntry) ->
case treeEntry of
Git.BlobEntry {Git.blobEntryOid, Git.blobEntryKind = Git.PlainBlob} ->
Just (blobEntryOid, B.toString filePath)
_ ->
Nothing
)
<$> ( Git.withRepository lgFactory "." $ do
head <- Git.parseOid hash
commit <- Git.lookupCommit (Tagged head)
tree <- Git.lookupTree (Git.commitTree commit)
Git.listTreeEntries tree
)
data Commit = Commit'
{ commitHash :: CommitHash,
date :: UTCTime,
author :: Author
}
deriving (Show, Generic, Binary, Eq)
data Author = Author
{ name :: T.Text,
email :: T.Text
}
deriving (Show, Generic, Binary, Eq)
getCommitOf :: CommitHash -> IO Commit
getCommitOf commitHash@WorkingTree = do
date <- getCurrentTime
authorName <- sh "git config user.name"
authorEmail <- sh "git config user.email"
pure
Commit'
{ author = Author authorName authorEmail,
..
}
getCommitOf commitHash@(Commit hash) = do
Git.withRepository lgFactory "." $ do
head <- Git.parseOid hash
commit <- Git.lookupCommit (Tagged head)
let authorName = Git.signatureName (Git.commitAuthor commit)
authorEmail = Git.signatureEmail (Git.commitAuthor commit)
date = zonedTimeToUTC (Git.signatureWhen (Git.commitAuthor commit))
pure
Commit'
{ author = Author authorName authorEmail,
..
}
readTextFileOfText :: CommitHash -> FilePath -> IO LT.Text
readTextFileOfText = readTextFileOf LT.readFile LT.decodeUtf8
readTextFileOfBS :: CommitHash -> FilePath -> IO LB.ByteString
readTextFileOfBS = readTextFileOf LB.readFile id
readTextFileOf :: (FilePath -> IO a) -> (LB.ByteString -> a) -> CommitHash -> FilePath -> IO a
readTextFileOf readFile _ WorkingTree filePath =
catch
(readFile filePath)
(\(_ :: IOException) -> throwIO (E.CannotReadFile filePath))
readTextFileOf _ decode (Commit hash) filePath =
maybe
(throwIO (E.CannotReadFile (printf "%s:%s" hash filePath)))
(pure . decode)
=<< Git.withRepository lgFactory "." do
hashRef <- Git.parseOid hash
commit <- Git.lookupCommit (Tagged hashRef)
Git.commitTreeEntry commit (B.fromString filePath) >>= \case
Just
( Git.BlobEntry
{ Git.blobEntryOid,
Git.blobEntryKind = Git.PlainBlob
}
) -> Just <$> Git.catBlobLazy blobEntryOid
_ -> pure Nothing
resolveRef :: T.Text -> IO CommitHash
resolveRef =
fmap (Commit . T.strip . T.decodeUtf8 . LB.toStrict)
. sh
. proc "git rev-parse %"
-- | `getCommitsBetween prevCommit commit` returns the commits from `prevCommit` to `commit`. The result excludes `prevCommit`, but includes `commit`.
--
-- If `prevCommit` is not an ancestor of `commit`, this functions throws `NoAncestor commit prevCommit`.
getCommitsBetween :: CommitHash -> CommitHash -> IO [CommitHash]
getCommitsBetween WorkingTree commit@(Commit _) =
throwIO (E.NoAncestor WorkingTree commit)
getCommitsBetween WorkingTree WorkingTree = pure [WorkingTree]
getCommitsBetween prevCommit WorkingTree =
fmap (++ [WorkingTree]) . getCommitsBetween prevCommit
=<< resolveRef "HEAD"
getCommitsBetween prevCommit@(Commit prevHash) commit@(Commit hash) = do
catch
(sh_ (proc "git merge-base --is-ancestor % %" prevHash hash))
(\(_ :: E.ProcessException) -> throwIO (E.NoAncestor commit prevCommit))
map (Commit . T.strip) . T.lines . T.decodeUtf8 . LB.toStrict
<$> sh (proc "git log --format=%%H %..%" prevHash hash)
diffOf :: CommitHash -> CommitHash -> IO A.Patch
diffOf prevHash hash =
A.parse . T.decodeUtf8 . LB.toStrict
<$> sh (proc "git diff % %" (toTextUnsafe prevHash) (toTextUnsafe hash))
|
