About

This Haskell library provides a Prelude for Polysemy libraries, building upon incipit-base and exporting most of Polysemy's core modules as well as a number of basic libraries:

• polysemy-conc
• polysemy-time
• polysemy-log
• polysemy-resume

For a minimal variant that only exports Polysemy, consider incipit-core. The two repositories are separated due to Cabal dependency cycles.

Usage

Using a custom Prelude requires the use of Cabal mixins to hide the module from base and replace it with Incipit:

For hpack:

dependencies:
  - name: base
    version: '>= 4 && < 5'
    mixin:
      - hiding (Prelude)
  - name: incipit
    version: '>= 0.3'
    mixin:
      - (Incipit as Prelude)
      - hiding (Incipit)

For cabal:

build-depends:
    base >=4 && <5, incipit >= 0.3
mixins:
    base hiding (Prelude), incipit (Incipit as Prelude), incipit hiding (Incipit)

incipit used to export Prelude, but stack can't deal with that.

Custom Prelude

In order to extend incipit with a local Prelude, the module Incipit has to be reexported:

dependencies:
  - name: base
    version: '>= 4 && < 5'
    mixin:
      - hiding (Prelude)
  - name: incipit
    version: >= 0.3
    mixin:
      - hiding (Prelude)

module Prelude (
  module Prelude,
  module Incipit,
) where

import Incipit

projectName :: Text
projectName =
  "spaceship"