What do I need to do to initialize a GHCJS project using Haskell Stack?
Following the stack documentation I am trying to initialize a GHCJS project so that I can compile Haskell code to JavaScript.
After doing stack templates I see there is a GHCJS template
ghcjs - Haskell to JavaScript compiler, based on GHC
When I try using the new command with this template like this:
stack new ghcjsSetup ghcjs
I get this error message:
Downloading template "ghcjs" to create project "ghcjsSetup" in ghcjsSetup/ ...
The following parameters were needed by the template but not provided: author-email, author-name, category, copyright, github-username
You can provide them in /home/u/.stack/config.yaml, like this:
templates:
params:
author-email: value
author-name: value
category: value
copyright: value
github-username: value
Or you can pass each one as parameters like this:
stack new ghcjsSetup ghcjs -p "author-email:value" -p "author-name:value" -p "category:value" -p "copyright:value" -p "github-username:value"
Looking for .cabal or package.yaml files to use to init the project.
Using cabal packages:
- ghcjsSetup/ghcjsSetup.cabal
Selecting the best among 11 snapshots...
* Partially matches lts-9.11
ghcjs-base not found
- ghcjsSetup requires -any
Downloaded nightly-2017-11-01 build plan.
Unable to parse cabal file: FromString "This package requires at least Cabal version 2.0" Nothing
I've got the same error recently. Apparently you've got an old version of stack. You need to upgrade it to version >= 1.5.1. This error occurs because of some file format changes in Cabal ver. 2.0 as I think.