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ghup/lib/GHup.hs

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{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# OPTIONS_GHC -Wno-orphans #-}
module GHup
(
-- * Types
ForkResult(..)
, CloneMethod(..)
, ProcessError(..)
-- * Settings
, getSettings
, writeSettings
-- * Github / Git actions
, prepareRepoForPR'
, prepareRepoForPR
, forkRepository
, cloneRepository
, setUpstream
, createBranch
, deleteFork'
, deleteFork
-- * Parsers
, parseURL
, ghURLParser
)
where
import Control.Applicative
import Control.Exception.Safe
import Control.Monad.Except
import Data.Attoparsec.ByteString
import Data.ByteString ( ByteString )
import qualified Data.ByteString.UTF8 as UTF8
import qualified Data.ByteString.Lazy.UTF8 as LUTF8
import Data.Functor ( (<&>) )
import Data.Proxy
import qualified Data.Text.Encoding as E
import Data.Word8
import GitHub.Auth
import GitHub.Data.Name
import GitHub.Data.URL
import GitHub.Endpoints.Repos
import GitHub.Request
import HPath
import HPath.IO
import Prelude hiding ( readFile
, writeFile
)
import System.Posix.ByteString ( getEnv
, RawFilePath
)
import System.Posix.Files.ByteString
import qualified System.Posix.Process.ByteString
as SPPB
import System.Posix.Process.ByteString
( ProcessStatus )
import qualified System.Posix.User as PU
import System.Exit
import Text.Read ( readEither )
------------------
--[ Data types ]--
------------------
data ForkResult = ForkResult {
upstream :: Repo
, downstream :: Repo
} deriving (Eq, Show)
data CloneMethod = CloneSSH
| CloneHTTP
deriving (Eq, Show)
data ProcessError = NoSuchPid
| ProcessFailed Int
| ProcessInterrupted
deriving (Eq, Show)
data UrlParseResult = UrlParseResult {
owner :: Name Owner
, repo :: Name Repo
} deriving (Eq, Show)
data Settings = Settings {
auth :: Auth
} deriving (Eq, Read, Show)
deriving instance Read Auth
----------------
--[ Settings ]--
----------------
writeSettings :: Auth -> IO ()
writeSettings auth = do
sf <- getSettingsFile
let settings = Settings auth
let fileperms =
ownerWriteMode
`unionFileModes` ownerReadMode
`unionFileModes` groupWriteMode
`unionFileModes` groupReadMode
writeFile sf (Just fileperms) (u8 . show $ settings)
putStrLn ("Written config to file " <> (UTF8.toString $ toFilePath sf))
getSettingsFile :: IO (Path Abs)
getSettingsFile = do
let app_dir = [rel|ghup|] :: Path Rel
getEnv (u8 "XDG_CONFIG_HOME") >>= \case
Just config -> do
pc <- parseAbs config
pure $ pc </> app_dir
Nothing -> do
let config_dir = [rel|.config|] :: Path Rel
home <- getHomeDirectory >>= parseAbs
pure $ home </> config_dir </> app_dir
getSettings :: IO (Either String Settings)
getSettings = runExceptT (fromEnv <|> fromFile)
where
fromEnv :: ExceptT String IO Settings
fromEnv = do
(lift $ getEnv (u8 "GITHUB_TOKEN")) >>= \case
Just t -> pure $ Settings (OAuth t)
Nothing -> throwError "Not found"
fromFile :: ExceptT String IO Settings
fromFile = do
sf <- lift $ getSettingsFile
out <-
ExceptT
$ ( flip catchIOError (\e -> pure $ Left $ show e)
$ fmap Right
$ readFile sf
)
liftEither $ readEither (LUTF8.toString out)
----------------------------
--[ Github / Git actions ]--
----------------------------
-- | Same as 'prepareRepoForPR', but gets the auth from the config file
-- and parses the owner/repo from the given repo url string.
prepareRepoForPR' :: ByteString -- ^ string that contains repo url
-> Maybe (Path b) -- ^ base path where the repo should be cloned
-> Maybe ByteString -- ^ PR branch name to switch to
-> IO (Either String ())
prepareRepoForPR' repoString repobase branch = runExceptT $ do
UrlParseResult {..} <- liftEither $ parseURL repoString
Settings {..} <- ExceptT getSettings
ExceptT $ prepareRepoForPR auth owner repo repobase branch
-- | Fork the repository to my account, clone it, add original upstream
-- as remote, optionally switch to the given branch.
prepareRepoForPR :: AuthMethod am
=> am
-> Name Owner
-> Name Repo
-> Maybe (Path b) -- ^ base path where the repo should be cloned
-> Maybe ByteString -- ^ PR branch name to switch to
-> IO (Either String ())
prepareRepoForPR am owner repo repobase branch = runExceptT $ do
repodest <- case repobase of
Just rb ->
((rb </>) <$> (parseRel $ E.encodeUtf8 $ untagName repo)) >>= lift . toAbs
Nothing -> (parseRel $ E.encodeUtf8 $ untagName repo) >>= lift . toAbs
ForkResult {..} <- withExceptT show $ ExceptT $ forkRepository am owner repo
withExceptT show $ ExceptT $ cloneRepository CloneSSH downstream repodest
withExceptT show $ ExceptT $ setUpstream upstream repodest
case branch of
Just b -> withExceptT show $ ExceptT $ createBranch b repodest
Nothing -> pure ()
forkRepository :: AuthMethod am
=> am
-> Name Owner
-> Name Repo
-> IO (Either Error ForkResult)
forkRepository am owner repo = runExceptT $ do
upstream <- ExceptT $ github' (repositoryR owner repo)
downstream <- ExceptT $ github am (forkExistingRepoR owner repo Nothing)
pure $ ForkResult { .. }
cloneRepository :: CloneMethod
-> Repo
-> Path b -- ^ full path where the repo should be cloned to
-> IO (Either ProcessError ())
cloneRepository CloneSSH (Repo { repoSshUrl = (Just url) }) dest =
_clone (E.encodeUtf8 $ getUrl url) (toFilePath dest)
cloneRepository CloneHTTP (Repo { repoCloneUrl = (Just url) }) dest =
_clone (E.encodeUtf8 $ getUrl url) (toFilePath dest)
cloneRepository _ _ _ = fail "No clone url!"
setUpstream :: Repo -- ^ upstream
-> Path b -- ^ full path to repo
-> IO (Either ProcessError ())
setUpstream (Repo { repoCloneUrl = (Just url) }) repodir = _runGit
[ u8 "-C"
, toFilePath repodir
, u8 "remote"
, u8 "add"
, u8 "upstream"
, (E.encodeUtf8 $ getUrl url)
]
setUpstream _ _ = fail "No clone url!"
createBranch :: ByteString -- ^ branch name
-> Path b -- ^ full path to repo
-> IO (Either ProcessError ())
createBranch branch repodir =
_runGit [u8 "-C", toFilePath repodir, u8 "checkout", u8 "-b", branch]
-- | Same as deleteFork, but gets the auth from the config file
-- and parses the owner/repo from the given repo url string.
deleteFork' :: ByteString
-> IO (Either String ())
deleteFork' repoString = runExceptT $ do
UrlParseResult {..} <- liftEither $ parseURL repoString
Settings {..} <- ExceptT getSettings
ExceptT $ deleteFork auth owner repo
deleteFork :: AuthMethod am
=> am
-> Name Owner
-> Name Repo
-> IO (Either String ())
deleteFork am owner repo = runExceptT $ do
(withExceptT show $ ExceptT $ github' (repositoryR owner repo)) >>= \case
(Repo { repoFork = Just True }) -> pure ()
_ -> throwError "Not a fork"
withExceptT show $ ExceptT $ github am (deleteRepoR owner repo)
---------------
--[ Parsers ]--
---------------
parseURL :: ByteString -> Either String UrlParseResult
parseURL = parseOnly ghURLParser
ghURLParser :: Parser UrlParseResult
ghURLParser =
(\n r ->
let owner = mkName (Proxy :: Proxy Owner) (E.decodeUtf8 n)
repo = mkName (Proxy :: Proxy Repo) (E.decodeUtf8 r)
in UrlParseResult { .. }
)
<$> ( ( str "https://github.com/"
<|> str "http://github.com/"
<|> str "git@github.com:"
<|> empty'
)
*> takeWhile1 (\w -> (w /= _slash) && isAlphaNum w)
<* word8 _slash
)
<*> (takeWhile1 isAlphaNum <* ((str ".git" <|> empty') <* endOfInput))
where
str = string . u8
empty' = str ""
---------------
--[ Helpers ]--
---------------
u8 :: String -> ByteString
u8 = UTF8.fromString
_clone :: ByteString -> ByteString -> IO (Either ProcessError ())
_clone url dest = _runGit [u8 "clone", url, dest]
_toGitError :: Maybe ProcessStatus -> Either ProcessError ()
_toGitError ps = case ps of
Just (SPPB.Exited ExitSuccess ) -> Right ()
Just (SPPB.Exited (ExitFailure i)) -> Left $ ProcessFailed i
Just (SPPB.Terminated _ _ ) -> Left $ ProcessInterrupted
Just (SPPB.Stopped _ ) -> Left $ ProcessInterrupted
Nothing -> Left $ NoSuchPid
_runGit :: [ByteString] -> IO (Either ProcessError ())
_runGit args = do
pid <- executeFile ([rel|git|] :: Path Rel) args
SPPB.getProcessStatus True True pid <&> _toGitError
getHomeDirectory :: IO RawFilePath
getHomeDirectory = do
e <- getEnv (u8 "HOME")
case e of
Just fp -> pure fp
Nothing -> do
h <- PU.homeDirectory <$> (PU.getEffectiveUserID >>= PU.getUserEntryForID)
pure $ u8 h -- this is a guess
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