Like Haskell's interact function but for Elm.
To quote from the Haskell docs:
The interact function takes a function of type String->String as its argument. The entire input from the standard input device is passed to this function as its argument, and the resulting string is output on the standard output device.
The elm part is easy, e.g. to create a program that converts it's input to upper case:
module Upper exposing (main)
import Interact exposing (Args)
import String
main : Program Args
main =
Interact.interact String.toUpperIf you want to use command line arguments you can use interactArgs.
TODO: Example of interactArgs
You should use the template.js included in the project or something like it
to bootstrap your program from javascript.
The MakeIndex example is actually an Interact program that builds an index.js for you. I plain to update it to make an executable she-bang script out of your program soon.
You can see a more complicated example in Examples/Multi.elm which is a program that
allows you to compose a pipeline of the Elm String functions.
It can be used like so:
% node index.js reverse toUpper
foo bar
baz bif
^D
FIB ZAB
RAB OOF
TODO: document interactR and interactWithArgsR.
- Assumes utf-8 encoding
- Reads entire file into memory at once
elm-interact is made available under the BSD3 open source license.
Copyright (c) 2016 John Evans.