CODEWITHSUNDEEP
haskellcabal
OrenIshShalom
OrenIshShalom

Reputation: 7162

cabal run pass arguments to program

I can build and run a simple Haskell program with cabal

module Main where
import System.Environment ( getArgs )
main :: IO ()
main = do

   -- (input:_:_) <- getArgs
   print "Hello Oren"

When no arguments are expected, everything goes fine:

$ cabal build 1>/dev/null 2>/dev/null
$ cabal run
Up to date
"Hello Oren"

It seems possible to pass arguments to the program:

$ cabal run --help | sed -n '13,16p'
Extra arguments can be passed to the program, but use '--' to separate
arguments for the program from arguments for cabal. The executable is run in
an environment where it can find its data files inplace in the build tree.

However, I can't seem to make it work:

$ cabal run -- Oren 13 10              
cabal: Cannot run the package Oren, it is not in this project (either directly
or indirectly). If you want to add it to the project then edit the
cabal.project file.

Upvotes: 5

Views: 1126

Answers (1)

Noughtmare
Noughtmare

Reputation: 10685

You'll need to explicitly call your target that you want to run. For example you can use exes as a shorthand if you only have one executable:

$ cabal run exes -- Oren 13 10

The cabal documentation section on Target Forms lists all possible ways to write the target.

Upvotes: 5

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