The stack script command¶
stack script [--package PACKAGE] FILE
[-- ARGUMENT(S) (e.g. stack script X.hs -- argument(s) to program)]
[--compile | --optimize] [--ghc-options OPTIONS]
[--extra-dep PACKAGE-VERSION] [--no-run]
The stack script command also either runs a specified Haskell source file
(using GHC's runghc) or, optionally, compiles a specified Haskell source file
(using GHC) and, by default, runs it.
However, unlike stack ghc and stack runghc, the command ignores all Stack
YAML configuration files. A snapshot must be specified on the command line (with
the --resolver option). For example:
or, equivalently:
Everything after -- on the command line is interpreted as a command line
argument to be passed to what is run.
A package can be added to the snapshot on the command line with the
--extra-dep option (which can be specified multiple times).
Each required package can be specified by name on the command line with the
--package option (which can be specified multiple times). A single --package
option can also refer to a list of package names, separated by a space or comma
character. If the package is not in the snapshot, the most recent version on
Hackage will be obtained. If no packages are specified in that way, all the
required packages that are in the snapshot will be deduced by reference to the
import statements in the source file. The base package associated with the
version of GHC specified by the snapshot is always available.
The source file can be compiled by passing either the --compile flag (no
optimization) or the --optimize flag (compilation with optimization). If the
file is compiled, passing the --no-run flag will mean the compiled code is not
run.
Additional options can be passed to GHC using the --ghc-options option.
For example, MyScript.hs:
module Main (main) where
import Data.List (intercalate)
import System.Environment (getArgs)
import Acme.Missiles (launchMissiles)
main :: IO ()
main = do
advices <- getArgs
launchMissiles
putStrLn $ intercalate "\n" advices
can be compiled and run, with arguments, with: