shelly-1.8.0: shell-like (systems) programming in Haskell

Safe Haskell | None
Language | Haskell98

Shelly

Contents

- Entering Sh.
- Running external commands.
- Running commands Using handles
- Handle manipulation
- Modifying and querying environment.
- Environment directory
- Printing
- Querying filesystem.
- Filename helpers
- Manipulating filesystem.
- reading/writing Files
- exiting the program
- Exceptions
- convert between Text and FilePath
- Utility Functions
- Re-exported for your convenience
- internal functions for writing extensions
- find functions

Description

A module for shell-like programming in Haskell. Shelly's focus is entirely on ease of use for those coming from shell scripting. However, it also tries to use modern libraries and techniques to keep things efficient.

The functionality provided by this module is (unlike standard Haskell filesystem functionality) thread-safe: each Sh maintains its own environment and its own working directory.

Recommended usage includes putting the following at the top of your program, otherwise you will likely need either type annotations or type conversions

    {-# LANGUAGE OverloadedStrings #-}
    {-# LANGUAGE ExtendedDefaultRules #-}
    {-# OPTIONS_GHC -fno-warn-type-defaults #-}
    import Shelly
    import qualified Data.Text as T
    default (T.Text)

Synopsis

- data Sh a
- type ShIO a = Sh a
- shelly :: MonadIO m => Sh a -> m a
- shellyNoDir :: MonadIO m => Sh a -> m a
- shellyFailDir :: MonadIO m => Sh a -> m a
- asyncSh :: Sh a -> Sh (Async a)
- sub :: Sh a -> Sh a
- silently :: Sh a -> Sh a
- verbosely :: Sh a -> Sh a
- escaping :: Bool -> Sh a -> Sh a
- print_stdout :: Bool -> Sh a -> Sh a
- print_stderr :: Bool -> Sh a -> Sh a
- print_commands :: Bool -> Sh a -> Sh a
- onCommandHandles :: StdInit -> Sh a -> Sh a
- tracing :: Bool -> Sh a -> Sh a
- errExit :: Bool -> Sh a -> Sh a
- log_stdout_with :: (Text -> IO ()) -> Sh a -> Sh a
- log_stderr_with :: (Text -> IO ()) -> Sh a -> Sh a
- run :: FilePath -> [Text] -> Sh Text
- run_ :: FilePath -> [Text] -> Sh ()
- runFoldLines :: a -> FoldCallback a -> FilePath -> [Text] -> Sh a
- cmd :: ShellCmd result => FilePath -> result
- type FoldCallback a = a -> Text -> a
- bash :: FilePath -> [Text] -> Sh Text
- bash_ :: FilePath -> [Text] -> Sh ()
- bashPipeFail :: (FilePath -> [Text] -> Sh a) -> FilePath -> [Text] -> Sh a
- (-|-) :: Sh Text -> Sh b -> Sh b
- lastStderr :: Sh Text
- setStdin :: Text -> Sh ()
- lastExitCode :: Sh Int
- command :: FilePath -> [Text] -> [Text] -> Sh Text
- command_ :: FilePath -> [Text] -> [Text] -> Sh ()
- command1 :: FilePath -> [Text] -> Text -> [Text] -> Sh Text
- command1_ :: FilePath -> [Text] -> Text -> [Text] -> Sh ()
- sshPairs :: Text -> [(FilePath, [Text])] -> Sh Text
- sshPairsPar :: Text -> [(FilePath, [Text])] -> Sh Text
- sshPairs_ :: Text -> [(FilePath, [Text])] -> Sh ()
- sshPairsPar_ :: Text -> [(FilePath, [Text])] -> Sh ()
- sshPairsWithOptions :: Text -> [Text] -> [(FilePath, [Text])] -> Sh Text
- sshCommandText :: [(FilePath, [Text])] -> SshMode -> Text
- data SshMode
  - = ParSsh
  - | SeqSsh
- class ShellCmd t where
  - cmdAll :: FilePath -> [Text] -> t
- class CmdArg a where
  - toTextArg :: a -> Text
- runHandle :: FilePath -> [Text] -> (Handle -> Sh a) -> Sh a
- runHandles :: FilePath -> [Text] -> [StdHandle] -> (Handle -> Handle -> Handle -> Sh a) -> Sh a
- transferLinesAndCombine :: Handle -> (Text -> IO ()) -> IO Text
- transferFoldHandleLines :: a -> FoldCallback a -> Handle -> (Text -> IO ()) -> IO a
- data StdHandle
  - = InHandle StdStream
  - | OutHandle StdStream
  - | ErrorHandle StdStream
- data StdStream
  - = Inherit
  - | UseHandle Handle
  - | CreatePipe
  - | NoStream
- type HandleInitializer = Handle -> IO ()
- data StdInit = StdInit {
  - inInit :: HandleInitializer
  - outInit :: HandleInitializer
  - errInit :: HandleInitializer
  }
- initOutputHandles :: HandleInitializer -> StdInit
- initAllHandles :: HandleInitializer -> StdInit
- setenv :: Text -> Text -> Sh ()
- get_env :: Text -> Sh (Maybe Text)
- get_env_text :: Text -> Sh Text
- getenv :: Text -> Sh Text
- get_env_def :: Text -> Text -> Sh Text
- get_env_all :: Sh [(String, String)]
- get_environment :: Sh [(String, String)]
- appendToPath :: FilePath -> Sh ()
- prependToPath :: FilePath -> Sh ()
- cd :: FilePath -> Sh ()
- chdir :: FilePath -> Sh a -> Sh a
- chdir_p :: FilePath -> Sh a -> Sh a
- pwd :: Sh FilePath
- echo :: Text -> Sh ()
- echo_n :: Text -> Sh ()
- echo_err :: Text -> Sh ()
- echo_n_err :: Text -> Sh ()
- inspect :: Show s => s -> Sh ()
- inspect_err :: Show s => s -> Sh ()
- tag :: Sh a -> Text -> Sh a
- trace :: Text -> Sh ()
- show_command :: FilePath -> [Text] -> Text
- ls :: FilePath -> Sh [FilePath]
- lsT :: FilePath -> Sh [Text]
- test_e :: FilePath -> Sh Bool
- test_f :: FilePath -> Sh Bool
- test_d :: FilePath -> Sh Bool
- test_s :: FilePath -> Sh Bool
- test_px :: FilePath -> Sh Bool
- which :: FilePath -> Sh (Maybe FilePath)
- absPath :: FilePath -> Sh FilePath
- (</>) :: (ToFilePath filepath1, ToFilePath filepath2) => filepath1 -> filepath2 -> FilePath
- (<.>) :: ToFilePath filepath => filepath -> Text -> FilePath
- canonic :: FilePath -> Sh FilePath
- canonicalize :: FilePath -> Sh FilePath
- relPath :: FilePath -> Sh FilePath
- relativeTo :: FilePath -> FilePath -> Sh FilePath
- path :: FilePath -> Sh FilePath
- hasExt :: Text -> FilePath -> Bool
- mv :: FilePath -> FilePath -> Sh ()
- rm :: FilePath -> Sh ()
- rm_f :: FilePath -> Sh ()
- rm_rf :: FilePath -> Sh ()
- cp :: FilePath -> FilePath -> Sh ()
- cp_r :: FilePath -> FilePath -> Sh ()
- mkdir :: FilePath -> Sh ()
- mkdir_p :: FilePath -> Sh ()
- mkdirTree :: Tree FilePath -> Sh ()
- readfile :: FilePath -> Sh Text
- readBinary :: FilePath -> Sh ByteString
- writefile :: FilePath -> Text -> Sh ()
- writeBinary :: FilePath -> ByteString -> Sh ()
- appendfile :: FilePath -> Text -> Sh ()
- touchfile :: FilePath -> Sh ()
- withTmpDir :: (FilePath -> Sh a) -> Sh a
- exit :: Int -> Sh a
- errorExit :: Text -> Sh a
- quietExit :: Int -> Sh a
- terror :: Text -> Sh a
- bracket_sh :: Sh a -> (a -> Sh b) -> (a -> Sh c) -> Sh c
- catchany :: IO a -> (SomeException -> IO a) -> IO a
- catch_sh :: Exception e => Sh a -> (e -> Sh a) -> Sh a
- handle_sh :: Exception e => (e -> Sh a) -> Sh a -> Sh a
- handleany_sh :: (SomeException -> Sh a) -> Sh a -> Sh a
- finally_sh :: Sh a -> Sh b -> Sh a
- data ShellyHandler a = Exception e => ShellyHandler (e -> Sh a)
- catches_sh :: Sh a -> [ShellyHandler a] -> Sh a
- catchany_sh :: Sh a -> (SomeException -> Sh a) -> Sh a
- data ReThrownException e = ReThrownException e String
- data RunFailed = RunFailed FilePath [Text] Int Text
- toTextIgnore :: FilePath -> Text
- toTextWarn :: FilePath -> Sh Text
- fromText :: Text -> FilePath
- whenM :: Monad m => m Bool -> m () -> m ()
- unlessM :: Monad m => m Bool -> m () -> m ()
- time :: Sh a -> Sh (Double, a)
- sleep :: Int -> Sh ()
- liftIO :: MonadIO m => IO a -> m a
- when :: Applicative f => Bool -> f () -> f ()
- unless :: Applicative f => Bool -> f () -> f ()
- data FilePath
- (<$>) :: Functor f => (a -> b) -> f a -> f b
- get :: Sh State
- put :: State -> Sh ()
- find :: FilePath -> Sh [FilePath]
- findWhen :: (FilePath -> Sh Bool) -> FilePath -> Sh [FilePath]
- findFold :: (a -> FilePath -> Sh a) -> a -> FilePath -> Sh a
- findDirFilter :: (FilePath -> Sh Bool) -> FilePath -> Sh [FilePath]
- findDirFilterWhen :: (FilePath -> Sh Bool) -> (FilePath -> Sh Bool) -> FilePath -> Sh [FilePath]
- findFoldDirFilter :: (a -> FilePath -> Sh a) -> a -> (FilePath -> Sh Bool) -> FilePath -> Sh a
- followSymlink :: Bool -> Sh a -> Sh a

# Entering Sh.

data Sh a #

Instances

Monad Sh # |
Instance details Defined in Shelly.Base Methods (>>=) :: Sh a -> (a -> Sh b) -> Sh b # (>>) :: Sh a -> Sh b -> Sh b # return :: a -> Sh a # fail :: String -> Sh a #
Functor Sh # |
Instance details Defined in Shelly.Base Methods fmap :: (a -> b) -> Sh a -> Sh b # (<$) :: a -> Sh b -> Sh a #
Applicative Sh # |
Instance details Defined in Shelly.Base Methods pure :: a -> Sh a # (<*>) :: Sh (a -> b) -> Sh a -> Sh b # liftA2 :: (a -> b -> c) -> Sh a -> Sh b -> Sh c # (*>) :: Sh a -> Sh b -> Sh b # (<*) :: Sh a -> Sh b -> Sh a #
MonadIO Sh # |
Instance details Defined in Shelly.Base Methods liftIO :: IO a -> Sh a #
MonadThrow Sh # |
Instance details Defined in Shelly.Base Methods throwM :: Exception e => e -> Sh a #
MonadCatch Sh # |
Instance details Defined in Shelly.Base Methods catch :: Exception e => Sh a -> (e -> Sh a) -> Sh a #
MonadMask Sh # |
Instance details Defined in Shelly.Base Methods mask :: ((forall a. Sh a -> Sh a) -> Sh b) -> Sh b # uninterruptibleMask :: ((forall a. Sh a -> Sh a) -> Sh b) -> Sh b # generalBracket :: Sh a -> (a -> ExitCase b -> Sh c) -> (a -> Sh b) -> Sh (b, c) #
MonadShControl Sh # |
Instance details Defined in Shelly.Lifted Associated Types data ShM Sh a :: Type # Methods liftShWith :: ((forall x. Sh x -> Sh (ShM Sh x)) -> Sh a) -> Sh a # restoreSh :: ShM Sh a -> Sh a #
MonadSh Sh # |
Instance details Defined in Shelly.Lifted Methods liftSh :: Sh a -> Sh a #
MonadBase IO Sh # |
Instance details Defined in Shelly.Base Methods liftBase :: IO α -> Sh α #
MonadBaseControl IO Sh # |
Instance details Defined in Shelly.Base Associated Types type StM Sh a :: Type # Methods liftBaseWith :: (RunInBase Sh IO -> IO a) -> Sh a # restoreM :: StM Sh a -> Sh a #
ShellCmd (Sh ()) # |
Instance details Defined in Shelly Methods cmdAll :: FilePath -> [Text] -> Sh () #
(s ~ Text, Show s) => ShellCmd (Sh s) # |
Instance details Defined in Shelly Methods cmdAll :: FilePath -> [Text] -> Sh s #
ShellCmd (Sh Text) # |
Instance details Defined in Shelly Methods cmdAll :: FilePath -> [Text] -> Sh Text #
newtype ShM Sh a # |
Instance details Defined in Shelly.Lifted newtype ShM Sh a = ShSh a
type StM Sh a # |
Instance details Defined in Shelly.Base type StM Sh a

type ShIO a = Sh a #

Deprecated: Use Sh instead of ShIO

ShIO is Deprecated in favor of `Sh`, which is easier to type.

shelly :: MonadIO m => Sh a -> m a #

Enter a Sh from (Monad)IO. The environment and working directories are inherited from the current process-wide values. Any subsequent changes in processwide working directory or environment are not reflected in the running Sh.

shellyNoDir :: MonadIO m => Sh a -> m a #

Deprecated: Just use shelly. The default settings have changed

Deprecated now, just use `shelly`, whose default has been changed. Using this entry point does not create a `.shelly` directory in the case of failure. Instead it logs directly into the standard error stream (`stderr`).

shellyFailDir :: MonadIO m => Sh a -> m a #

Using this entry point creates a `.shelly` directory in the case of failure where errors are recorded.

asyncSh :: Sh a -> Sh (Async a) #

spawn an asynchronous action with a copy of the current state

sub :: Sh a -> Sh a #

Enter a sub-Sh that inherits the environment The original state will be restored when the sub-Sh completes. Exceptions are propagated normally.

silently :: Sh a -> Sh a #

Create a sub-Sh in which external command outputs are not echoed and commands are not printed. See `sub`.

verbosely :: Sh a -> Sh a #

Create a sub-Sh in which external command outputs are echoed and Executed commands are printed See `sub`.

escaping :: Bool -> Sh a -> Sh a #

Create a sub-Sh with shell character escaping on or off. Defaults to `True`.

Setting to `False` allows for shell wildcard such as * to be expanded by the shell along with any other special shell characters. As a side-effect, setting to `False` causes changes to `PATH` to be ignored: see the `run` documentation.

print_stdout :: Bool -> Sh a -> Sh a #

Create a sub-Sh with stdout printing on or off Defaults to True.

print_stderr :: Bool -> Sh a -> Sh a #

Create a sub-Sh with stderr printing on or off Defaults to True.

print_commands :: Bool -> Sh a -> Sh a #

Create a sub-Sh with command echoing on or off Defaults to False, set to True by `verbosely`

onCommandHandles :: StdInit -> Sh a -> Sh a #

When running an external command, apply the given initializers to the specified handles for that command. This can for example be used to change the encoding of the handles or set them into binary mode.

tracing :: Bool -> Sh a -> Sh a #

Create a sub-Sh where commands are not traced Defaults to True. You should only set to False temporarily for very specific reasons

errExit :: Bool -> Sh a -> Sh a #

named after bash -e errexit. Defaults to `True`. When `True`, throw an exception on a non-zero exit code. When `False`, ignore a non-zero exit code. Not recommended to set to `False` unless you are specifically checking the error code with `lastExitCode`.

log_stdout_with :: (Text -> IO ()) -> Sh a -> Sh a #

Create a sub-Sh in which stdout is sent to the user-defined logger. When running with `silently` the given log will not be called for any output. Likewise the log will also not be called for output from `run_` and `bash_` commands.

log_stderr_with :: (Text -> IO ()) -> Sh a -> Sh a #

Create a sub-Sh in which stderr is sent to the user-defined logger. When running with `silently` the given log will not be called for any output. However, unlike `log_stdout_with` the log will be called for output from `run_` and `bash_` commands.

# Running external commands.

run :: FilePath -> [Text] -> Sh Text #

Execute an external command. Takes the command name and arguments.

You may prefer using `cmd` instead, which is a variadic argument version of this function.

`stdout` and `stderr` are collected. The `stdout` is returned as a result of `run`, and complete stderr output is available after the fact using `lastStderr`

All of the stdout output will be loaded into memory. You can avoid this if you don't need stdout by using `run_`, If you want to avoid the memory and need to process the output then use `runFoldLines` or `runHandle` or `runHandles`.

By default shell characters are escaped and the command name is a name of a program that can be found via `PATH`. Shelly will look through the `PATH` itself to find the command.

When `escaping` is set to `False`, shell characters are allowed. Since there is no longer a guarantee that a single program name is given, Shelly cannot look in the `PATH` for it. a `PATH` modified by setenv is not taken into account when finding the exe name. Instead the original Haskell program `PATH` is used. On a Posix system the `env` command can be used to make the `setenv` PATH used when `escaping` is set to False. `env echo hello` instead of `echo hello`

run_ :: FilePath -> [Text] -> Sh () #

the same as `run`, but return `()` instead of the stdout content stdout will be read and discarded line-by-line

runFoldLines :: a -> FoldCallback a -> FilePath -> [Text] -> Sh a #

used by `run`. fold over stdout line-by-line as it is read to avoid keeping it in memory stderr is still being placed in memory under the assumption it is always relatively small

cmd :: ShellCmd result => FilePath -> result #

variadic argument version of `run`. Please see the documenation for `run`.

The syntax is more convenient, but more importantly it also allows the use of a FilePath as a command argument. So an argument can be a Text or a FilePath without manual conversions. a FilePath is automatically converted to Text with `toTextIgnore`.

Convenient usage of `cmd` requires the following:

    {-# LANGUAGE OverloadedStrings #-}
    {-# LANGUAGE ExtendedDefaultRules #-}
    {-# OPTIONS_GHC -fno-warn-type-defaults #-}
    import Shelly
    import qualified Data.Text as T
    default (T.Text)

type FoldCallback a = a -> Text -> a #

bash :: FilePath -> [Text] -> Sh Text #

Like `run`, but it invokes the user-requested program with _bash_.

bash_ :: FilePath -> [Text] -> Sh () #

bashPipeFail :: (FilePath -> [Text] -> Sh a) -> FilePath -> [Text] -> Sh a #

Use this with `bash` to set _pipefail_

    bashPipeFail $ bash "echo foo | echo"

(-|-) :: Sh Text -> Sh b -> Sh b #

Pipe operator. set the stdout the first command as the stdin of the second. This does not create a shell-level pipe, but hopefully it will in the future. To create a shell level pipe you can set `escaping False` and use a pipe `|` character in a command.

lastStderr :: Sh Text #

The output of last external command. See `run`.

setStdin :: Text -> Sh () #

set the stdin to be used and cleared by the next `run`.

lastExitCode :: Sh Int #

The exit code from the last command. Unless you set `errExit` to False you won't get a chance to use this: a non-zero exit code will throw an exception.

command :: FilePath -> [Text] -> [Text] -> Sh Text #

bind some arguments to run for re-use. Example:

    monit = command "monit" ["-c", "monitrc"]
    monit ["stop", "program"]

command_ :: FilePath -> [Text] -> [Text] -> Sh () #

bind some arguments to `run_` for re-use. Example:

    monit_ = command_ "monit" ["-c", "monitrc"]
    monit_ ["stop", "program"]

command1 :: FilePath -> [Text] -> Text -> [Text] -> Sh Text #

bind some arguments to run for re-use, and require 1 argument. Example:

    git = command1 "git" []; git "pull" ["origin", "master"]

command1_ :: FilePath -> [Text] -> Text -> [Text] -> Sh () #

bind some arguments to run for re-use, and require 1 argument. Example:

    git_ = command1_ "git" []; git "pull" ["origin", "master"]

sshPairs :: Text -> [(FilePath, [Text])] -> Sh Text #

run commands over SSH. An ssh executable is expected in your path. Commands are in the same form as `run`, but given as pairs

    sshPairs "server-name" [("cd", "dir"), ("rm",["-r","dir2"])]

This interface is crude, but it works for now.

Please note this sets `escaping` to False, and the remote commands are quoted with single quotes, in a way such that the remote commands will see the literal values you passed, this means that no variable expansion and alike will done on either the local shell or the remote shell, and that if there are a single or double quotes in your arguments, they need not to be quoted manually.

Internally the list of commands are combined with the string `&&` before given to ssh.

sshPairsPar :: Text -> [(FilePath, [Text])] -> Sh Text #

Same as sshPairs, but combines commands with the string `&`, so they will be started in parallell.

sshPairs_ :: Text -> [(FilePath, [Text])] -> Sh () #

same as `sshPairs`, but returns ()

sshPairsPar_ :: Text -> [(FilePath, [Text])] -> Sh () #

same as `sshPairsP`, but returns ()

sshPairsWithOptions #

Arguments

:: Text | Server name.
-> [Text] | Arguments to ssh (e.g. ["-p","22"]).
-> [(FilePath, [Text])] | Pairs of commands to run on the remote.
-> Sh Text | Returns the standard output.

Like `sshPairs`, but allows for arguments to the call to ssh.

sshCommandText :: [(FilePath, [Text])] -> SshMode -> Text #

data SshMode #

Constructors

ParSsh |
SeqSsh |

class ShellCmd t where #

For the variadic function `cmd`

partially applied variadic functions require type signatures

Methods

cmdAll :: FilePath -> [Text] -> t #

Instances

MonadSh m => ShellCmd (m ()) # |
Instance details Defined in Shelly.Lifted Methods cmdAll :: FilePath -> [Text] -> m () #
(MonadSh m, s ~ Text, Show s) => ShellCmd (m s) # |
Instance details Defined in Shelly.Lifted Methods cmdAll :: FilePath -> [Text] -> m s #
MonadSh m => ShellCmd (m Text) # |
Instance details Defined in Shelly.Lifted Methods cmdAll :: FilePath -> [Text] -> m Text #
ShellCmd (Sh ()) # |
Instance details Defined in Shelly Methods cmdAll :: FilePath -> [Text] -> Sh () #
(s ~ Text, Show s) => ShellCmd (Sh s) # |
Instance details Defined in Shelly Methods cmdAll :: FilePath -> [Text] -> Sh s #
ShellCmd (Sh Text) # |
Instance details Defined in Shelly Methods cmdAll :: FilePath -> [Text] -> Sh Text #
(CmdArg arg, ShellCmd result) => ShellCmd ([arg] -> result) # |
Instance details Defined in Shelly Methods cmdAll :: FilePath -> [Text] -> [arg] -> result #
(CmdArg arg, ShellCmd result) => ShellCmd (arg -> result) # |
Instance details Defined in Shelly Methods cmdAll :: FilePath -> [Text] -> arg -> result #

class CmdArg a where #

Argument converter for the variadic argument version of `run` called `cmd`. Useful for a type signature of a function that uses `cmd`

Methods

toTextArg :: a -> Text #

Instances

CmdArg String # |
Instance details Defined in Shelly Methods toTextArg :: String -> Text #
CmdArg Text # |
Instance details Defined in Shelly Methods toTextArg :: Text -> Text #
CmdArg FilePath # |
Instance details Defined in Shelly Methods toTextArg :: FilePath -> Text #

# Running commands Using handles

runHandle #

Arguments

:: FilePath | command
-> [Text] | arguments
-> (Handle -> Sh a) | stdout handle
-> Sh a |

Similar to `run` but gives the raw stdout handle in a callback. If you want even more control, use `runHandles`.

runHandles #

Arguments

:: FilePath | command
-> [Text] | arguments
-> [StdHandle] | optionally connect process i/o handles to existing handles
-> (Handle -> Handle -> Handle -> Sh a) | stdin, stdout and stderr
-> Sh a |

Similar to `run` but gives direct access to all input and output handles.

Be careful when using the optional input handles. If you specify Inherit for a handle then attempting to access the handle in your callback is an error

transferLinesAndCombine :: Handle -> (Text -> IO ()) -> IO Text #

Transfer from one handle to another For example, send contents of a process output to stdout. does not close the write handle.

Also, return the complete contents being streamed line by line.

transferFoldHandleLines :: a -> FoldCallback a -> Handle -> (Text -> IO ()) -> IO a #

Transfer from one handle to another For example, send contents of a process output to stdout. does not close the write handle.

Also, fold over the contents being streamed line by line

data StdHandle #

Constructors

InHandle StdStream |
OutHandle StdStream |
ErrorHandle StdStream |

data StdStream #

Constructors

Inherit | Inherit Handle from parent
UseHandle Handle | Use the supplied Handle
CreatePipe | Create a new pipe. The returned `Handle` will use the default encoding and newline translation mode (just like `Handle`s created by `openFile`).
NoStream | Close the stream's file descriptor without passing a Handle. On POSIX systems this may lead to strange behavior in the child process because attempting to read or write after the file has been closed throws an error. This should only be used with child processes that don't use the file descriptor at all. If you wish to ignore the child process's output you should either create a pipe and drain it manually or pass a `Handle` that writes to `/dev/null`.

Instances

Eq StdStream |
Instance details Defined in System.Process.Common Methods (==) :: StdStream -> StdStream -> Bool # (/=) :: StdStream -> StdStream -> Bool #
Show StdStream |
Instance details Defined in System.Process.Common Methods showsPrec :: Int -> StdStream -> ShowS # show :: StdStream -> String # showList :: [StdStream] -> ShowS #

# Handle manipulation

type HandleInitializer = Handle -> IO () #

Initialize a handle before using it

data StdInit #

A collection of initializers for the three standard process handles

Constructors

StdInit |
Fields inInit :: HandleInitializer outInit :: HandleInitializer errInit :: HandleInitializer

initOutputHandles :: HandleInitializer -> StdInit #

Apply a single initializer to the two output process handles (stdout and stderr)

initAllHandles :: HandleInitializer -> StdInit #

Apply a single initializer to all three standard process handles (stdin, stdout and stderr)

# Modifying and querying environment.

setenv :: Text -> Text -> Sh () #

Set an environment variable. The environment is maintained in Sh internally, and is passed to any external commands to be executed.

get_env :: Text -> Sh (Maybe Text) #

Fetch the current value of an environment variable. if non-existant or empty text, will be Nothing

get_env_text :: Text -> Sh Text #

Fetch the current value of an environment variable. Both empty and non-existent variables give empty string as a result.

getenv :: Text -> Sh Text #

Deprecated: use get_env or get_env_text

deprecated

get_env_def :: Text -> Text -> Sh Text #

Deprecated: use fromMaybe DEFAULT get_env

Fetch the current value of an environment variable. Both empty and non-existent variables give the default Text value as a result

get_env_all :: Sh [(String, String)] #

get the full environment

get_environment :: Sh [(String, String)] #

Deprecated: use get_env_all

appendToPath :: FilePath -> Sh () #

add the filepath onto the PATH env variable

prependToPath :: FilePath -> Sh () #

prepend the filepath to the PATH env variable similar to `appendToPath` but gives high priority to the filepath instead of low priority.

# Environment directory

cd :: FilePath -> Sh () #

Change current working directory of Sh. This does *not* change the working directory of the process we are running it. Instead, Sh keeps track of its own working directory and builds absolute paths internally instead of passing down relative paths.

chdir :: FilePath -> Sh a -> Sh a #

`cd`, execute a Sh action in the new directory and then pop back to the original directory

chdir_p :: FilePath -> Sh a -> Sh a #

`chdir`, but first create the directory if it does not exit

pwd :: Sh FilePath #

Obtain the current (Sh) working directory.

# Printing

echo :: Text -> Sh () #

Echo text to standard (error, when using _err variants) output. The _n variants do not print a final newline.

echo_n :: Text -> Sh () #

Echo text to standard (error, when using _err variants) output. The _n variants do not print a final newline.

echo_err :: Text -> Sh () #

Echo text to standard (error, when using _err variants) output. The _n variants do not print a final newline.

echo_n_err :: Text -> Sh () #

Echo text to standard (error, when using _err variants) output. The _n variants do not print a final newline.

inspect :: Show s => s -> Sh () #

a print lifted into `Sh`

inspect_err :: Show s => s -> Sh () #

a print lifted into `Sh` using stderr

tag :: Sh a -> Text -> Sh a #

same as `trace`, but use it combinator style

trace :: Text -> Sh () #

internally log what occurred. Log will be re-played on failure.

show_command :: FilePath -> [Text] -> Text #

# Querying filesystem.

ls :: FilePath -> Sh [FilePath] #

List directory contents. Does *not* include "." and "..", but it does include (other) hidden files.

lsT :: FilePath -> Sh [Text] #

Get back [Text] instead of [FilePath]

test_e :: FilePath -> Sh Bool #

Does a path point to an existing filesystem object?

test_f :: FilePath -> Sh Bool #

Does a path point to an existing file?

test_d :: FilePath -> Sh Bool #

Does a path point to an existing directory?

test_s :: FilePath -> Sh Bool #

Does a path point to a symlink?

test_px :: FilePath -> Sh Bool #

Test that a file is in the PATH and also executable

which :: FilePath -> Sh (Maybe FilePath) #

Get a full path to an executable by looking at the `PATH` environement variable. Windows normally looks in additional places besides the `PATH`: this does not duplicate that behavior.

# Filename helpers

absPath :: FilePath -> Sh FilePath #

Make a relative path absolute by combining with the working directory. An absolute path is returned as is. To create a relative path, use `relPath`.

(</>) :: (ToFilePath filepath1, ToFilePath filepath2) => filepath1 -> filepath2 -> FilePath #

uses System.FilePath.CurrentOS, but can automatically convert a Text

(<.>) :: ToFilePath filepath => filepath -> Text -> FilePath #

uses System.FilePath.CurrentOS, but can automatically convert a Text

canonic :: FilePath -> Sh FilePath #

makes an absolute path. Like `canonicalize`, but on an exception returns `absPath`

canonicalize :: FilePath -> Sh FilePath #

Obtain a (reasonably) canonic file path to a filesystem object. Based on "canonicalizePath" in system-fileio.

relPath :: FilePath -> Sh FilePath #

Makes a relative path relative to the current Sh working directory. An absolute path is returned as is. To create an absolute path, use `absPath`

relativeTo #

Arguments

:: FilePath | anchor path, the prefix
-> FilePath | make this relative to anchor path
-> Sh FilePath |

make the second path relative to the first Uses `stripPrefix`, but will canonicalize the paths if necessary

path :: FilePath -> Sh FilePath #

Deprecated: use absPath, canonic, or relPath instead

deprecated

hasExt :: Text -> FilePath -> Bool #

flipped hasExtension for Text

# Manipulating filesystem.

mv :: FilePath -> FilePath -> Sh () #

Move a file. The second path could be a directory, in which case the original file is moved into that directory. wraps system-fileio `rename`, which may not work across FS boundaries

rm :: FilePath -> Sh () #

Remove a file. Does fail if the file does not exist (use `rm_f` instead) or is not a file.

rm_f :: FilePath -> Sh () #

Remove a file. Does not fail if the file does not exist. Does fail if the file is not a file.

rm_rf :: FilePath -> Sh () #

A swiss army cannon for removing things. Actually this goes farther than a normal rm -rf, as it will circumvent permission problems for the files we own. Use carefully. Uses `removeTree`

cp :: FilePath -> FilePath -> Sh () #

Copy a file. The second path could be a directory, in which case the original file name is used, in that directory.

cp_r :: FilePath -> FilePath -> Sh () #

Copy a file, or a directory recursively. uses `cp`

mkdir :: FilePath -> Sh () #

Create a new directory (fails if the directory exists).

mkdir_p :: FilePath -> Sh () #

Create a new directory, including parents (succeeds if the directory already exists).

mkdirTree :: Tree FilePath -> Sh () #

Create a new directory tree. You can describe a bunch of directories as a tree and this function will create all subdirectories. An example:

    exec = mkTree $
              "package" # [
                   "src" # [
                       "Data" # leaves ["Tree", "List", "Set", "Map"]
                   ],
                   "test" # leaves ["QuickCheck", "HUnit"],
                   "dist/doc/html" # []
               ]
            where (#) = Node
                  leaves = map (# [])

# reading/writing Files

readfile :: FilePath -> Sh Text #

readBinary :: FilePath -> Sh ByteString #

wraps ByteSting readFile

writefile :: FilePath -> Text -> Sh () #

Write a Text to a file.

writeBinary :: FilePath -> ByteString -> Sh () #

appendfile :: FilePath -> Text -> Sh () #

Append a Text to a file.

touchfile :: FilePath -> Sh () #

Update a file, creating (a blank file) if it does not exist.

withTmpDir :: (FilePath -> Sh a) -> Sh a #

Create a temporary directory and pass it as a parameter to a Sh computation. The directory is nuked afterwards.

# exiting the program

exit :: Int -> Sh a #

exit 0 means no errors, all other codes are error conditions

errorExit :: Text -> Sh a #

echo a message and exit with status 1

quietExit :: Int -> Sh a #

for exiting with status > 0 without printing debug information

terror :: Text -> Sh a #

fail that takes a Text

# Exceptions

bracket_sh :: Sh a -> (a -> Sh b) -> (a -> Sh c) -> Sh c #

catchany :: IO a -> (SomeException -> IO a) -> IO a #

A helper to catch any exception (same as `... `catch` (e :: SomeException) -> ...`).

catch_sh :: Exception e => Sh a -> (e -> Sh a) -> Sh a #

Same as a normal `catch` but specialized for the Sh monad.

handle_sh :: Exception e => (e -> Sh a) -> Sh a -> Sh a #

Same as a normal `handle` but specialized for the Sh monad.

handleany_sh :: (SomeException -> Sh a) -> Sh a -> Sh a #

Handle any exception in the Sh monad.

finally_sh :: Sh a -> Sh b -> Sh a #

Same as a normal `finally` but specialized for the `Sh` monad.

data ShellyHandler a #

You need to wrap exception handlers with this when using `catches_sh`.

Constructors

Exception e => ShellyHandler (e -> Sh a) |

catches_sh :: Sh a -> [ShellyHandler a] -> Sh a #

Same as a normal `catches`, but specialized for the `Sh` monad.

catchany_sh :: Sh a -> (SomeException -> Sh a) -> Sh a #

Catch any exception in the Sh monad.

data ReThrownException e #

Shelly's wrapper around exceptions thrown in its monad

Constructors

ReThrownException e String |

Instances

Exception e => Show (ReThrownException e) # |
Instance details Defined in Shelly Methods showsPrec :: Int -> ReThrownException e -> ShowS # show :: ReThrownException e -> String # showList :: [ReThrownException e] -> ShowS #
Exception e => Exception (ReThrownException e) # |
Instance details Defined in Shelly Methods toException :: ReThrownException e -> SomeException # fromException :: SomeException -> Maybe (ReThrownException e) # displayException :: ReThrownException e -> String #

data RunFailed #

Constructors

RunFailed FilePath [Text] Int Text |

Instances

Show RunFailed # |
Instance details Defined in Shelly Methods showsPrec :: Int -> RunFailed -> ShowS # show :: RunFailed -> String # showList :: [RunFailed] -> ShowS #
Exception RunFailed # |
Instance details Defined in Shelly Methods toException :: RunFailed -> SomeException # fromException :: SomeException -> Maybe RunFailed # displayException :: RunFailed -> String #

# convert between Text and FilePath

toTextIgnore :: FilePath -> Text #

silently uses the Right or Left value of "Filesystem.Path.CurrentOS.toText"

toTextWarn :: FilePath -> Sh Text #

fromText :: Text -> FilePath #

Convert human‐readable text into a `FilePath`.

This function ignores the user’s locale, and assumes all file paths are encoded in UTF8. If you need to create file paths with an unusual or obscure encoding, encode them manually and then use `decode`.

Since: 0.2

# Utility Functions

whenM :: Monad m => m Bool -> m () -> m () #

A monadic-conditional version of the "when" guard.

unlessM :: Monad m => m Bool -> m () -> m () #

A monadic-conditional version of the `unless` guard.

time :: Sh a -> Sh (Double, a) #

Run a Sh computation and collect timing information. The value returned is the amount of _real_ time spent running the computation in seconds, as measured by the system clock. The precision is determined by the resolution of `getCurrentTime`.

sleep :: Int -> Sh () #

threadDelay wrapper that uses seconds

# Re-exported for your convenience

liftIO :: MonadIO m => IO a -> m a #

Lift a computation from the `IO` monad.

when :: Applicative f => Bool -> f () -> f () #

Conditional execution of `Applicative` expressions. For example,

    when debug (putStrLn "Debugging")

will output the string `Debugging` if the Boolean value `debug` is `True`, and otherwise do nothing.

unless :: Applicative f => Bool -> f () -> f () #

The reverse of `when`.

data FilePath #

Instances

Eq FilePath |
Instance details Defined in Filesystem.Path.Internal Methods (==) :: FilePath -> FilePath -> Bool # (/=) :: FilePath -> FilePath -> Bool #
Data FilePath |
Instance details Defined in Filesystem.Path.Internal Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> FilePath -> c FilePath # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c FilePath # toConstr :: FilePath -> Constr # dataTypeOf :: FilePath -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c FilePath) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c FilePath) # gmapT :: (forall b. Data b => b -> b) -> FilePath -> FilePath # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> FilePath -> r # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> FilePath -> r # gmapQ :: (forall d. Data d => d -> u) -> FilePath -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> FilePath -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> FilePath -> m FilePath # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> FilePath -> m FilePath # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> FilePath -> m FilePath #
Ord FilePath |
Instance details Defined in Filesystem.Path.Internal Methods compare :: FilePath -> FilePath -> Ordering # (<) :: FilePath -> FilePath -> Bool # (<=) :: FilePath -> FilePath -> Bool # (>) :: FilePath -> FilePath -> Bool # (>=) :: FilePath -> FilePath -> Bool # max :: FilePath -> FilePath -> FilePath # min :: FilePath -> FilePath -> FilePath #
NFData FilePath |
Instance details Defined in Filesystem.Path.Internal Methods rnf :: FilePath -> () #
CmdArg FilePath # |
Instance details Defined in Shelly Methods toTextArg :: FilePath -> Text #

(<$>) :: Functor f => (a -> b) -> f a -> f b infixl 4 #

An infix synonym for `fmap`.

The name of this operator is an allusion to `$`. Note the similarities between their types:

     ($)  ::              (a -> b) ->   a ->   b
    (<$>) :: Functor f => (a -> b) -> f a -> f b

Whereas `$` is function application, `<$>` is function application lifted over a `Functor`.

#### Examples

Expand

Convert from a ``Maybe` `Int`` to a ``Maybe` `String`` using `show`:

    >>> show <$> Nothing
    Nothing
    >>> show <$> Just 3
    Just "3"

Convert from an ``Either` `Int` `Int`` to an ``Either` `Int`` `String` using `show`:

    >>> show <$> Left 17
    Left 17
    >>> show <$> Right 17
    Right "17"

Double each element of a list:

    >>> (*2) <$> [1,2,3]
    [2,4,6]

Apply `even` to the second element of a pair:

    >>> even <$> (2,2)
    (2,True)

# internal functions for writing extensions

get :: Sh State #

put :: State -> Sh () #

# find functions

find :: FilePath -> Sh [FilePath] #

List directory recursively (like the POSIX utility "find"). listing is relative if the path given is relative. If you want to filter out some results or fold over them you can do that with the returned files. A more efficient approach is to use one of the other find functions.

findWhen :: (FilePath -> Sh Bool) -> FilePath -> Sh [FilePath] #

`find` that filters the found files as it finds. Files must satisfy the given filter to be returned in the result.

findFold :: (a -> FilePath -> Sh a) -> a -> FilePath -> Sh a #

Fold an arbitrary folding function over files froma a `find`. Like `findWhen` but use a more general fold rather than a filter.

findDirFilter :: (FilePath -> Sh Bool) -> FilePath -> Sh [FilePath] #

`find` that filters out directories as it finds Filtering out directories can make a find much more efficient by avoiding entire trees of files.

findDirFilterWhen #

Arguments

:: (FilePath -> Sh Bool) | directory filter
-> (FilePath -> Sh Bool) | file filter
-> FilePath | directory
-> Sh [FilePath] |

similar `findWhen`, but also filter out directories Alternatively, similar to `findDirFilter`, but also filter out files Filtering out directories makes the find much more efficient

findFoldDirFilter :: (a -> FilePath -> Sh a) -> a -> (FilePath -> Sh Bool) -> FilePath -> Sh a #

like `findDirFilterWhen` but use a folding function rather than a filter The most general finder: you likely want a more specific one

followSymlink :: Bool -> Sh a -> Sh a #

`find`-command follows symbolic links. Defaults to `False`. When `True`, follow symbolic links. When `False`, never follow symbolic links.