{-# LANGUAGE NoImplicitPrelude   #-}
{-# LANGUAGE RecordWildCards     #-}
{-# LANGUAGE ScopedTypeVariables #-}

-- | Extra functions for optparse-applicative.


module Options.Applicative.Builder.Extra
  (boolFlags
  ,boolFlagsNoDefault
  ,firstBoolFlagsNoDefault
  ,firstBoolFlagsTrue
  ,firstBoolFlagsFalse
  ,enableDisableFlags
  ,enableDisableFlagsNoDefault
  ,extraHelpOption
  ,execExtraHelp
  ,textOption
  ,textArgument
  ,optionalFirst
  ,optionalFirstTrue
  ,optionalFirstFalse
  ,absFileOption
  ,relFileOption
  ,absDirOption
  ,relDirOption
  ,eitherReader'
  ,fileCompleter
  ,fileExtCompleter
  ,dirCompleter
  ,PathCompleterOpts(..)
  ,defaultPathCompleterOpts
  ,pathCompleterWith
  ,unescapeBashArg
  ,showHelpText
  ) where

import Data.List (isPrefixOf)
import Data.Maybe
import Data.Monoid hiding ((<>))
import qualified Data.Text as T
import Options.Applicative
import Options.Applicative.Types (readerAsk)
import Path hiding ((</>))
import Stack.Prelude
import System.Directory (getCurrentDirectory, getDirectoryContents, doesDirectoryExist)
import System.Environment (withArgs)
import System.FilePath (takeBaseName, (</>), splitFileName, isRelative, takeExtension)

-- | Enable/disable flags for a 'Bool'.

boolFlags :: Bool                 -- ^ Default value

          -> String               -- ^ Flag name

          -> String               -- ^ Help suffix

          -> Mod FlagFields Bool
          -> Parser Bool
boolFlags :: Bool -> String -> String -> Mod FlagFields Bool -> Parser Bool
boolFlags Bool
defaultValue String
name String
helpSuffix =
  forall a.
a -> a -> a -> String -> String -> Mod FlagFields a -> Parser a
enableDisableFlags Bool
defaultValue Bool
True Bool
False String
name forall a b. (a -> b) -> a -> b
$ forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat
    [ String
helpSuffix
    , String
" (default: "
    , if Bool
defaultValue then String
"enabled" else String
"disabled"
    , String
")"
    ]

-- | Enable/disable flags for a 'Bool', without a default case (to allow chaining with '<|>').

boolFlagsNoDefault :: String               -- ^ Flag name

                   -> String               -- ^ Help suffix

                   -> Mod FlagFields Bool
                   -> Parser Bool
boolFlagsNoDefault :: String -> String -> Mod FlagFields Bool -> Parser Bool
boolFlagsNoDefault = forall a.
a -> a -> String -> String -> Mod FlagFields a -> Parser a
enableDisableFlagsNoDefault Bool
True Bool
False

-- | Flag with no default of True or False

firstBoolFlagsNoDefault :: String -> String -> Mod FlagFields (Maybe Bool) -> Parser (First Bool)
firstBoolFlagsNoDefault :: String
-> String -> Mod FlagFields (Maybe Bool) -> Parser (First Bool)
firstBoolFlagsNoDefault String
name String
helpSuffix Mod FlagFields (Maybe Bool)
mod' =
  forall a. Maybe a -> First a
First forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$>
  forall a.
a -> a -> a -> String -> String -> Mod FlagFields a -> Parser a
enableDisableFlags forall a. Maybe a
Nothing (forall a. a -> Maybe a
Just Bool
True) (forall a. a -> Maybe a
Just Bool
False)
  String
name String
helpSuffix Mod FlagFields (Maybe Bool)
mod'

-- | Flag with a Semigroup instance and a default of True

firstBoolFlagsTrue :: String -> String -> Mod FlagFields FirstTrue -> Parser FirstTrue
firstBoolFlagsTrue :: String -> String -> Mod FlagFields FirstTrue -> Parser FirstTrue
firstBoolFlagsTrue String
name String
helpSuffix =
  forall a.
a -> a -> a -> String -> String -> Mod FlagFields a -> Parser a
enableDisableFlags forall a. Monoid a => a
mempty (Maybe Bool -> FirstTrue
FirstTrue (forall a. a -> Maybe a
Just Bool
True)) (Maybe Bool -> FirstTrue
FirstTrue (forall a. a -> Maybe a
Just Bool
False))
  String
name forall a b. (a -> b) -> a -> b
$ String
helpSuffix forall a. [a] -> [a] -> [a]
++ String
" (default: enabled)"

-- | Flag with a Semigroup instance and a default of False

firstBoolFlagsFalse :: String -> String -> Mod FlagFields FirstFalse -> Parser FirstFalse
firstBoolFlagsFalse :: String -> String -> Mod FlagFields FirstFalse -> Parser FirstFalse
firstBoolFlagsFalse String
name String
helpSuffix =
  forall a.
a -> a -> a -> String -> String -> Mod FlagFields a -> Parser a
enableDisableFlags forall a. Monoid a => a
mempty (Maybe Bool -> FirstFalse
FirstFalse (forall a. a -> Maybe a
Just Bool
True)) (Maybe Bool -> FirstFalse
FirstFalse (forall a. a -> Maybe a
Just Bool
False))
  String
name forall a b. (a -> b) -> a -> b
$ String
helpSuffix forall a. [a] -> [a] -> [a]
++ String
" (default: disabled)"

-- | Enable/disable flags for any type.

enableDisableFlags :: a                 -- ^ Default value

                   -> a                 -- ^ Enabled value

                   -> a                 -- ^ Disabled value

                   -> String            -- ^ Name

                   -> String            -- ^ Help suffix

                   -> Mod FlagFields a
                   -> Parser a
enableDisableFlags :: forall a.
a -> a -> a -> String -> String -> Mod FlagFields a -> Parser a
enableDisableFlags a
defaultValue a
enabledValue a
disabledValue String
name String
helpSuffix Mod FlagFields a
mods =
  forall a.
a -> a -> String -> String -> Mod FlagFields a -> Parser a
enableDisableFlagsNoDefault a
enabledValue a
disabledValue String
name String
helpSuffix Mod FlagFields a
mods forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|>
  forall (f :: * -> *) a. Applicative f => a -> f a
pure a
defaultValue

-- | Enable/disable flags for any type, without a default (to allow chaining with '<|>')

enableDisableFlagsNoDefault :: a                 -- ^ Enabled value

                            -> a                 -- ^ Disabled value

                            -> String            -- ^ Name

                            -> String            -- ^ Help suffix

                            -> Mod FlagFields a
                            -> Parser a
enableDisableFlagsNoDefault :: forall a.
a -> a -> String -> String -> Mod FlagFields a -> Parser a
enableDisableFlagsNoDefault a
enabledValue a
disabledValue String
name String
helpSuffix Mod FlagFields a
mods =
  forall {a}. [a] -> a
last forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall (f :: * -> *) a. Alternative f => f a -> f [a]
some
      ((forall a. a -> Mod FlagFields a -> Parser a
flag'
           a
enabledValue
           (forall (f :: * -> *) a. Mod f a
hidden forall a. Semigroup a => a -> a -> a
<>
            forall (f :: * -> *) a. Mod f a
internal forall a. Semigroup a => a -> a -> a
<>
            forall (f :: * -> *) a. HasName f => String -> Mod f a
long String
name forall a. Semigroup a => a -> a -> a
<>
            forall (f :: * -> *) a. String -> Mod f a
help String
helpSuffix forall a. Semigroup a => a -> a -> a
<>
            Mod FlagFields a
mods) forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|>
       forall a. a -> Mod FlagFields a -> Parser a
flag'
           a
disabledValue
           (forall (f :: * -> *) a. Mod f a
hidden forall a. Semigroup a => a -> a -> a
<>
            forall (f :: * -> *) a. Mod f a
internal forall a. Semigroup a => a -> a -> a
<>
            forall (f :: * -> *) a. HasName f => String -> Mod f a
long (String
"no-" forall a. [a] -> [a] -> [a]
++ String
name) forall a. Semigroup a => a -> a -> a
<>
            forall (f :: * -> *) a. String -> Mod f a
help String
helpSuffix forall a. Semigroup a => a -> a -> a
<>
            Mod FlagFields a
mods)) forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|>
       forall a. a -> Mod FlagFields a -> Parser a
flag'
           a
disabledValue
           (forall (f :: * -> *) a. HasName f => String -> Mod f a
long (String
"[no-]" forall a. [a] -> [a] -> [a]
++ String
name) forall a. Semigroup a => a -> a -> a
<>
            forall (f :: * -> *) a. String -> Mod f a
help (String
"Enable/disable " forall a. [a] -> [a] -> [a]
++ String
helpSuffix) forall a. Semigroup a => a -> a -> a
<>
            Mod FlagFields a
mods))
  where
    last :: [a] -> a
last [a]
xs =
      case forall a. [a] -> [a]
reverse [a]
xs of
        [] -> forall e a. Exception e => e -> a
impureThrow forall a b. (a -> b) -> a -> b
$ HasCallStack => String -> StringException
stringException String
"enableDisableFlagsNoDefault.last"
        a
x:[a]
_ -> a
x

-- | Show an extra help option (e.g. @--docker-help@ shows help for all @--docker*@ args).

--

-- To actually have that help appear, use 'execExtraHelp' before executing the main parser.

extraHelpOption :: Bool             -- ^ Hide from the brief description?

                -> String           -- ^ Program name, e.g. @"stack"@

                -> String           -- ^ Option glob expression, e.g. @"docker*"@

                -> String           -- ^ Help option name, e.g. @"docker-help"@

                -> Parser (a -> a)
extraHelpOption :: forall a. Bool -> String -> String -> String -> Parser (a -> a)
extraHelpOption Bool
hide String
progName String
fakeName String
helpName =
    forall a. String -> Mod OptionFields (a -> a) -> Parser (a -> a)
infoOption (String
optDesc' forall a. [a] -> [a] -> [a]
++ String
".") (forall (f :: * -> *) a. HasName f => String -> Mod f a
long String
helpName forall a. Semigroup a => a -> a -> a
<> forall (f :: * -> *) a. Mod f a
hidden forall a. Semigroup a => a -> a -> a
<> forall (f :: * -> *) a. Mod f a
internal) forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*>
    forall a. String -> Mod OptionFields (a -> a) -> Parser (a -> a)
infoOption (String
optDesc' forall a. [a] -> [a] -> [a]
++ String
".") (forall (f :: * -> *) a. HasName f => String -> Mod f a
long String
fakeName forall a. Semigroup a => a -> a -> a
<>
                                  forall (f :: * -> *) a. String -> Mod f a
help String
optDesc' forall a. Semigroup a => a -> a -> a
<>
                                  (if Bool
hide then forall (f :: * -> *) a. Mod f a
hidden forall a. Semigroup a => a -> a -> a
<> forall (f :: * -> *) a. Mod f a
internal else forall a. Monoid a => a
idm))
  where optDesc' :: String
optDesc' = forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat [String
"Run '", String -> String
takeBaseName String
progName, String
" --", String
helpName, String
"' for details"]

-- | Display extra help if extra help option passed in arguments.

--

-- Since optparse-applicative doesn't allow an arbitrary IO action for an 'abortOption', this

-- was the best way I found that doesn't require manually formatting the help.

execExtraHelp :: [String]  -- ^ Command line arguments

              -> String    -- ^ Extra help option name, e.g. @"docker-help"@

              -> Parser a  -- ^ Option parser for the relevant command

              -> String    -- ^ Option description

              -> IO ()
execExtraHelp :: forall a. [String] -> String -> Parser a -> String -> IO ()
execExtraHelp [String]
args String
helpOpt Parser a
parser String
pd =
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when ([String]
args forall a. Eq a => a -> a -> Bool
== [String
"--" forall a. [a] -> [a] -> [a]
++ String
helpOpt]) forall a b. (a -> b) -> a -> b
$
      forall a. [String] -> IO a -> IO a
withArgs [String
"--help"] forall a b. (a -> b) -> a -> b
$ do
        (a, [String])
_ <- forall a. ParserInfo a -> IO a
execParser (forall a. Parser a -> InfoMod a -> ParserInfo a
info (forall {a}. Parser (a -> a)
hiddenHelper forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*>
                               ((,) forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$>
                                Parser a
parser forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*>
                                forall (f :: * -> *) a. Alternative f => f a -> f [a]
some (forall s. IsString s => Mod ArgumentFields s -> Parser s
strArgument (forall (f :: * -> *) a. HasMetavar f => String -> Mod f a
metavar String
"OTHER ARGUMENTS") :: Parser String)))
                        (forall a. InfoMod a
fullDesc forall a. Semigroup a => a -> a -> a
<> forall a. String -> InfoMod a
progDesc String
pd))
        forall (m :: * -> *) a. Monad m => a -> m a
return ()
  where hiddenHelper :: Parser (a -> a)
hiddenHelper = forall a.
ParseError -> Mod OptionFields (a -> a) -> Parser (a -> a)
abortOption ParseError
showHelpText (forall (f :: * -> *) a. HasName f => String -> Mod f a
long String
"help" forall a. Semigroup a => a -> a -> a
<> forall (f :: * -> *) a. Mod f a
hidden forall a. Semigroup a => a -> a -> a
<> forall (f :: * -> *) a. Mod f a
internal)

-- | 'option', specialized to 'Text'.

textOption :: Mod OptionFields Text -> Parser Text
textOption :: Mod OptionFields Text -> Parser Text
textOption = forall a. ReadM a -> Mod OptionFields a -> Parser a
option (String -> Text
T.pack forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> ReadM String
readerAsk)

-- | 'argument', specialized to 'Text'.

textArgument :: Mod ArgumentFields Text -> Parser Text
textArgument :: Mod ArgumentFields Text -> Parser Text
textArgument = forall a. ReadM a -> Mod ArgumentFields a -> Parser a
argument (String -> Text
T.pack forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> ReadM String
readerAsk)

-- | Like 'optional', but returning a 'First'.

optionalFirst :: Alternative f => f a -> f (First a)
optionalFirst :: forall (f :: * -> *) a. Alternative f => f a -> f (First a)
optionalFirst = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap forall a. Maybe a -> First a
First forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (f :: * -> *) a. Alternative f => f a -> f (Maybe a)
optional

-- | Like 'optional', but returning a 'FirstTrue'.

optionalFirstTrue :: Alternative f => f Bool -> f FirstTrue
optionalFirstTrue :: forall (f :: * -> *). Alternative f => f Bool -> f FirstTrue
optionalFirstTrue = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Maybe Bool -> FirstTrue
FirstTrue forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (f :: * -> *) a. Alternative f => f a -> f (Maybe a)
optional

-- | Like 'optional', but returning a 'FirstFalse'.

optionalFirstFalse :: Alternative f => f Bool -> f FirstFalse
optionalFirstFalse :: forall (f :: * -> *). Alternative f => f Bool -> f FirstFalse
optionalFirstFalse = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Maybe Bool -> FirstFalse
FirstFalse forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (f :: * -> *) a. Alternative f => f a -> f (Maybe a)
optional

absFileOption :: Mod OptionFields (Path Abs File) -> Parser (Path Abs File)
absFileOption :: Mod OptionFields (Path Abs File) -> Parser (Path Abs File)
absFileOption Mod OptionFields (Path Abs File)
mods = forall a. ReadM a -> Mod OptionFields a -> Parser a
option (forall e a. Show e => (String -> Either e a) -> ReadM a
eitherReader' forall (m :: * -> *). MonadThrow m => String -> m (Path Abs File)
parseAbsFile) forall a b. (a -> b) -> a -> b
$
  forall (f :: * -> *) a. HasCompleter f => Completer -> Mod f a
completer (PathCompleterOpts -> Completer
pathCompleterWith PathCompleterOpts
defaultPathCompleterOpts { pcoRelative :: Bool
pcoRelative = Bool
False }) forall a. Semigroup a => a -> a -> a
<> Mod OptionFields (Path Abs File)
mods

relFileOption :: Mod OptionFields (Path Rel File) -> Parser (Path Rel File)
relFileOption :: Mod OptionFields (Path Rel File) -> Parser (Path Rel File)
relFileOption Mod OptionFields (Path Rel File)
mods = forall a. ReadM a -> Mod OptionFields a -> Parser a
option (forall e a. Show e => (String -> Either e a) -> ReadM a
eitherReader' forall (m :: * -> *). MonadThrow m => String -> m (Path Rel File)
parseRelFile) forall a b. (a -> b) -> a -> b
$
  forall (f :: * -> *) a. HasCompleter f => Completer -> Mod f a
completer (PathCompleterOpts -> Completer
pathCompleterWith PathCompleterOpts
defaultPathCompleterOpts { pcoAbsolute :: Bool
pcoAbsolute = Bool
False }) forall a. Semigroup a => a -> a -> a
<> Mod OptionFields (Path Rel File)
mods

absDirOption :: Mod OptionFields (Path Abs Dir) -> Parser (Path Abs Dir)
absDirOption :: Mod OptionFields (Path Abs Dir) -> Parser (Path Abs Dir)
absDirOption Mod OptionFields (Path Abs Dir)
mods = forall a. ReadM a -> Mod OptionFields a -> Parser a
option (forall e a. Show e => (String -> Either e a) -> ReadM a
eitherReader' forall (m :: * -> *). MonadThrow m => String -> m (Path Abs Dir)
parseAbsDir) forall a b. (a -> b) -> a -> b
$
  forall (f :: * -> *) a. HasCompleter f => Completer -> Mod f a
completer (PathCompleterOpts -> Completer
pathCompleterWith PathCompleterOpts
defaultPathCompleterOpts { pcoRelative :: Bool
pcoRelative = Bool
False, pcoFileFilter :: String -> Bool
pcoFileFilter = forall a b. a -> b -> a
const Bool
False }) forall a. Semigroup a => a -> a -> a
<> Mod OptionFields (Path Abs Dir)
mods

relDirOption :: Mod OptionFields (Path Rel Dir) -> Parser (Path Rel Dir)
relDirOption :: Mod OptionFields (Path Rel Dir) -> Parser (Path Rel Dir)
relDirOption Mod OptionFields (Path Rel Dir)
mods = forall a. ReadM a -> Mod OptionFields a -> Parser a
option (forall e a. Show e => (String -> Either e a) -> ReadM a
eitherReader' forall (m :: * -> *). MonadThrow m => String -> m (Path Rel Dir)
parseRelDir) forall a b. (a -> b) -> a -> b
$
  forall (f :: * -> *) a. HasCompleter f => Completer -> Mod f a
completer (PathCompleterOpts -> Completer
pathCompleterWith PathCompleterOpts
defaultPathCompleterOpts { pcoAbsolute :: Bool
pcoAbsolute = Bool
False, pcoFileFilter :: String -> Bool
pcoFileFilter = forall a b. a -> b -> a
const Bool
False }) forall a. Semigroup a => a -> a -> a
<> Mod OptionFields (Path Rel Dir)
mods

-- | Like 'eitherReader', but accepting any @'Show' e@ on the 'Left'.

eitherReader' :: Show e => (String -> Either e a) -> ReadM a
eitherReader' :: forall e a. Show e => (String -> Either e a) -> ReadM a
eitherReader' String -> Either e a
f = forall a. (String -> Either String a) -> ReadM a
eitherReader (forall a1 a2 b. (a1 -> a2) -> Either a1 b -> Either a2 b
mapLeft forall a. Show a => a -> String
show forall b c a. (b -> c) -> (a -> b) -> a -> c
. String -> Either e a
f)

data PathCompleterOpts = PathCompleterOpts
    { PathCompleterOpts -> Bool
pcoAbsolute :: Bool
    , PathCompleterOpts -> Bool
pcoRelative :: Bool
    , PathCompleterOpts -> Maybe String
pcoRootDir :: Maybe FilePath
    , PathCompleterOpts -> String -> Bool
pcoFileFilter :: FilePath -> Bool
    , PathCompleterOpts -> String -> Bool
pcoDirFilter :: FilePath -> Bool
    }

defaultPathCompleterOpts :: PathCompleterOpts
defaultPathCompleterOpts :: PathCompleterOpts
defaultPathCompleterOpts = PathCompleterOpts
    { pcoAbsolute :: Bool
pcoAbsolute = Bool
True
    , pcoRelative :: Bool
pcoRelative = Bool
True
    , pcoRootDir :: Maybe String
pcoRootDir = forall a. Maybe a
Nothing
    , pcoFileFilter :: String -> Bool
pcoFileFilter = forall a b. a -> b -> a
const Bool
True
    , pcoDirFilter :: String -> Bool
pcoDirFilter = forall a b. a -> b -> a
const Bool
True
    }

fileCompleter :: Completer
fileCompleter :: Completer
fileCompleter = PathCompleterOpts -> Completer
pathCompleterWith PathCompleterOpts
defaultPathCompleterOpts

fileExtCompleter :: [String] -> Completer
fileExtCompleter :: [String] -> Completer
fileExtCompleter [String]
exts = PathCompleterOpts -> Completer
pathCompleterWith PathCompleterOpts
defaultPathCompleterOpts { pcoFileFilter :: String -> Bool
pcoFileFilter = (forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [String]
exts) forall b c a. (b -> c) -> (a -> b) -> a -> c
. String -> String
takeExtension }

dirCompleter :: Completer
dirCompleter :: Completer
dirCompleter = PathCompleterOpts -> Completer
pathCompleterWith PathCompleterOpts
defaultPathCompleterOpts { pcoFileFilter :: String -> Bool
pcoFileFilter = forall a b. a -> b -> a
const Bool
False }

pathCompleterWith :: PathCompleterOpts -> Completer
pathCompleterWith :: PathCompleterOpts -> Completer
pathCompleterWith PathCompleterOpts {Bool
Maybe String
String -> Bool
pcoDirFilter :: String -> Bool
pcoFileFilter :: String -> Bool
pcoRootDir :: Maybe String
pcoRelative :: Bool
pcoAbsolute :: Bool
pcoDirFilter :: PathCompleterOpts -> String -> Bool
pcoRootDir :: PathCompleterOpts -> Maybe String
pcoFileFilter :: PathCompleterOpts -> String -> Bool
pcoAbsolute :: PathCompleterOpts -> Bool
pcoRelative :: PathCompleterOpts -> Bool
..} = (String -> IO [String]) -> Completer
mkCompleter forall a b. (a -> b) -> a -> b
$ \String
inputRaw -> do
    -- Unescape input, to handle single and double quotes. Note that the

    -- results do not need to be re-escaped, due to some fiddly bash

    -- magic.

    let input :: String
input = String -> String
unescapeBashArg String
inputRaw
    let (String
inputSearchDir0, String
searchPrefix) = String -> (String, String)
splitFileName String
input
        inputSearchDir :: String
inputSearchDir = if String
inputSearchDir0 forall a. Eq a => a -> a -> Bool
== String
"./" then String
"" else String
inputSearchDir0
    Maybe String
msearchDir <-
        case (String -> Bool
isRelative String
inputSearchDir, Bool
pcoAbsolute, Bool
pcoRelative) of
            (Bool
True, Bool
_, Bool
True) -> do
                String
rootDir <- forall b a. b -> (a -> b) -> Maybe a -> b
maybe IO String
getCurrentDirectory forall (m :: * -> *) a. Monad m => a -> m a
return Maybe String
pcoRootDir
                forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ forall a. a -> Maybe a
Just (String
rootDir String -> String -> String
</> String
inputSearchDir)
            (Bool
False, Bool
True, Bool
_) -> forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ forall a. a -> Maybe a
Just String
inputSearchDir
            (Bool, Bool, Bool)
_ -> forall (m :: * -> *) a. Monad m => a -> m a
return forall a. Maybe a
Nothing
    case Maybe String
msearchDir of
        Maybe String
Nothing
            | String
input forall a. Eq a => a -> a -> Bool
== String
"" Bool -> Bool -> Bool
&& Bool
pcoAbsolute -> forall (m :: * -> *) a. Monad m => a -> m a
return [String
"/"]
            | Bool
otherwise -> forall (m :: * -> *) a. Monad m => a -> m a
return []
        Just String
searchDir -> do
            [String]
entries <- String -> IO [String]
getDirectoryContents String
searchDir forall (m :: * -> *) e a.
(MonadUnliftIO m, Exception e) =>
m a -> (e -> m a) -> m a
`catch` \(IOException
_ :: IOException) -> forall (m :: * -> *) a. Monad m => a -> m a
return []
            forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap forall a. [Maybe a] -> [a]
catMaybes forall a b. (a -> b) -> a -> b
$ forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
t a -> (a -> m b) -> m (t b)
forM [String]
entries forall a b. (a -> b) -> a -> b
$ \String
entry ->
                -- Skip . and .. unless user is typing . or ..

                if String
entry forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [String
"..", String
"."] Bool -> Bool -> Bool
&& String
searchPrefix forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`notElem` [String
"..", String
"."] then forall (m :: * -> *) a. Monad m => a -> m a
return forall a. Maybe a
Nothing else
                    if String
searchPrefix forall a. Eq a => [a] -> [a] -> Bool
`isPrefixOf` String
entry
                        then do
                            let path :: String
path = String
searchDir String -> String -> String
</> String
entry
                            case (String -> Bool
pcoFileFilter String
path, String -> Bool
pcoDirFilter String
path) of
                                (Bool
True, Bool
True) -> forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ forall a. a -> Maybe a
Just (String
inputSearchDir String -> String -> String
</> String
entry)
                                (Bool
fileAllowed, Bool
dirAllowed) -> do
                                    Bool
isDir <- String -> IO Bool
doesDirectoryExist String
path
                                    if (if Bool
isDir then Bool
dirAllowed else Bool
fileAllowed)
                                        then forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ forall a. a -> Maybe a
Just (String
inputSearchDir String -> String -> String
</> String
entry)
                                        else forall (m :: * -> *) a. Monad m => a -> m a
return forall a. Maybe a
Nothing
                        else forall (m :: * -> *) a. Monad m => a -> m a
return forall a. Maybe a
Nothing

unescapeBashArg :: String -> String
unescapeBashArg :: String -> String
unescapeBashArg (Char
'\'' : String
rest) = String
rest
unescapeBashArg (Char
'\"' : String
rest) = String -> String
go String
rest
  where
    pattern :: String
pattern = String
"$`\"\\\n" :: String
    go :: String -> String
go [] = []
    go (Char
'\\' : Char
x : String
xs)
        | Char
x forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` String
pattern = Char
x forall a. a -> [a] -> [a]
: String
xs
        | Bool
otherwise = Char
'\\' forall a. a -> [a] -> [a]
: Char
x forall a. a -> [a] -> [a]
: String -> String
go String
xs
    go (Char
x : String
xs) = Char
x forall a. a -> [a] -> [a]
: String -> String
go String
xs
unescapeBashArg String
input = String -> String
go String
input
  where
    go :: String -> String
go [] = []
    go (Char
'\\' : Char
x : String
xs) = Char
x forall a. a -> [a] -> [a]
: String -> String
go String
xs
    go (Char
x : String
xs) = Char
x forall a. a -> [a] -> [a]
: String -> String
go String
xs

showHelpText :: ParseError
showHelpText :: ParseError
showHelpText = Maybe String -> ParseError
ShowHelpText forall a. Maybe a
Nothing