Running shell commands

[chshersh]

Implement functions to run Shell commands easier in the Iris applications. A simple implementation would be something like this (inspired by shellmet):

-- | Run the command but don't print it
shellSilent
    :: FilePath  -- ^ Executable name
    -> [Text]    -- ^ Arguments
    -> IO ()

-- | Run the command and print the command itself to stderr
shell
    :: Text      -- ^ Prompt
    -> FilePath  -- ^ Executable name
    -> [Text]    -- ^ Arguments
    -> IO ()

-- | Run the command, don't print it and return its stdout
shellRetSilent
    :: FilePath  -- ^ Executable name
    -> [Text]    -- ^ Arguments
    -> IO Text

-- | Run the command, print it with prompt to stderr and return its stdout
shellRet
    :: Text      -- ^ Prompt
    -> FilePath  -- ^ Executable name
    -> [Text]    -- ^ Arguments
    -> IO Text

Alternatively, we can integrate with one of the existing and battle-tested libraries:

• shellmet
• typed-process

Possible usage inside Iris itself — Iris.Browse module:

iris/src/Iris/Browse.hs

Lines 69 to 74 in 7e69433

	-- | Execute a command with arguments.
	runCommand :: FilePath -> [String] -> IO ()
	runCommand cmd args = do
	let cmdStr = showCommandForUser cmd args
	putStrLn $ "⚙ " ++ cmdStr
	callCommand cmdStr

Open questions:

• Would it make sense to run those commands in MonadReader CliEnv to use something specific for running shell commands?