How to install a package using stack?

Using cabal, I could install hakyll with the command:

cabal install hakyll

How can I do the same thing using stack?

Solution 1:

stack install hakyll

stack offers a curated set of packages that won't blow your machine up. If you want to check what packages are available, or exactly what version is supported, or on what version of GHC you can get it, check out https://www.stackage.org/.

For example, you can get hakyll 4.6.9.0 right now for both GHC 7.8.4 and GHC 7.10.1. Pretty neat. - source

EDIT: I forgot to mention, Yuan Wang's method works for getting the version of hakyll that is not curated into stackage. It's up to you what version you need.

Solution 2:

add hakyll in stack.yaml generated by stack init or stack new

yaml file should look like:

flags: {}
packages:
  - '.'
extra-deps:
  - hakyll-4.7.1.0
resolver: lts-2.15

after that, run stack solver installs it

https://github.com/commercialhaskell/stack/wiki/stack.yaml

Solution 3:

This documentation worked for me

On package.yaml add the library under dependencies, for example:

dependencies:
- base >= 4.7 && < 5
- hakyll # added here