stack-ghc.yaml

# For more information, see: https://github.com/commercialhaskell/stack/blob/release/doc/yaml_configuration.md

# Specifies the GHC version and set of packages available (e.g., lts-3.5, nightly-2015-09-21, ghc-7.10.2)
resolver: ghc-7.10.3

# Local packages, usually specified by relative directory name
packages:
- '.'

# Packages to be pulled from upstream that are not in the resolver (e.g., acme-missiles-0.3)
extra-deps: []

# Override default flag values for local packages and extra-deps
flags: {}

# Extra package databases containing global packages
extra-package-dbs: []

# Control whether we use the GHC we find on the path
# system-ghc: true

# Require a specific version of stack, using version ranges
# require-stack-version: -any # Default
# require-stack-version: >= 1.0.0

# Override the architecture used by stack, especially useful on Windows
# arch: i386
# arch: x86_64

# Extra directories used by stack for building
# extra-include-dirs: [/path/to/dir]
# extra-lib-dirs: [/path/to/dir]

stack-ghcjs.yaml

# what is the dual of GHCJS_BROWSER?
# ghc-options:
#   "*": -DGHCJS_BROWSER  # compile for the browser not Node.js

compiler: ghcjs-0.2.0.20151230.3_ghc-7.10.2
compiler-check: match-exact
setup-info:
 ghcjs:
  source:
   ghcjs-0.2.0.20151230.3_ghc-7.10.2:
    url: "https://github.com/nrolland/ghcjs/releases/download/v.0.2.0.20151230.3/ghcjs-0.2.0.20151230.3.tar.gz"
resolver: ghcjs-0.2.0.20151230.3_ghc-7.10.2

packages:
- '.'

# Packages to be pulled from upstream that are not in the resolver (e.g., acme-missiles-0.3)
extra-deps: []

# Override default flag values for local packages and extra-deps
flags: {}

# Extra package databases containing global packages
extra-package-dbs: []

swap-stack-yamls.sh

#!/bin/sh

if [ ! -f stack.yaml ]; then
    >&2 echo "defaulting to GHCJS"
    ln -s stack-ghcjs.yaml stack.yaml
else
    if [ -L stack.yaml ]; then
        if [ "$(readlink stack.yaml)" = stack-ghcjs.yaml ]; then
            >&2 echo "enabling GHC build"
            ln -sf stack-ghc.yaml   stack.yaml
        else
            >&2 echo "enabling GHCJS build"
            ln -sf stack-ghcjs.yaml stack.yaml
        fi
    else
        >&2 echo "stack.yaml is not a symlink; leaving as is."
        exit 1
    fi
fi