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Haskell Ecosystem Proposals

This repository contains specifications for proposed changes to the broader haskell ecosystem. See the Proposal Process Proposal for a complete description of the ecosystem proposal process.

It is shamelessly copied from the one used for GHC Proposals

What is a proposal?

An Ecosystem Proposal is a document describing a proposed change to the Haskell Ecosystem. These include,

  • Interoperability between package managers (e.g. cabal-install/hackage and stack/stackage).
  • Anything else of broader interest to the community.

This list is currently deliberately short to keep it simple and focussed, it can be expanded as we as a community gauge the receptiveness of the community to this process.

How do I comment on a proposal?

Discussion on a proposal occurs on its associated pull request. Click on the Pull Requests tab in GitHub to see a listing of the proposals currently under discussion. To see the text of the proposal click on the "Files Changed" tab on corresponding Pull Request page.

Github offers two ways of viewing diffs: the "source diff" view, which shows a plain text diff, and the "rich diff" view, which provides a more readable rendered view of the markup. The view can be selected using the buttons on the top-right corner of the "Files Changed" tab.

The view selector buttons.

Use the view selector buttons on the top right corner of the "Files Changed" tab to change between "source diff" and "rich diff" views.

Feedback on a proposal can be offered on open pull requests using both Github's in-line and pull request commenting features. Do note, however, that inline comments can only be added via the "source diff" view.

The ``+`` button appears while hovering over line in the source diff view.

Hover over a line in the source diff view of a pull request and click on the + to leave an inline comment

How do I submit a proposal?

While the full process is described in the proposal describing the proposal process, here is a short summary,

  1. Edit the template to reflect your proposal. Rename the template file according to your desired proposal, but leave the numerical prefix as 0000. This can be done either online through GitHub's in-place editing feature (the pencil icon visible when viewing a file on GitHub) or by forking this repository and cloning the fork. See GitHub's documentation if you are unfamiliar with this aspect of GitHub's workflow.

  2. Write the proposal. At very least this should describe the following,

    1. Motivation: What is the problem that you are trying to solve? Be specific: a concrete example or two can do wonders. Be sure to point out the particular ways in which the status quo falls short.

    2. Proposed Change: What change are you proposing? This is the specification of your change and should be precise and comprehensive. This might include,

      • scope of the change, what does it affect? cabal? stack? a web site?
      • the intended operation of the new change
      • how the proposed change addresses the original problem (perhaps returning to the concrete examples introduced in the Motivation section).
      • how the proposed change might interact with existing ecosystem features. In particular, pay attention to any unintended effects outside the immediate scope of the particular change.

      This generally needn't discuss the implementation of the change.

    3. Drawbacks: There's no such thing as a free lunch; what is the cost of your proposal? This includes the cost of implementing the proposal, mainintaining it indefinitely, teaching it to new users, and considering its interaction with future proposals.

    4. Alternatives: What alternatives to the proposed change exist? These can range from minor variants to completely . This doesn't need to go into great detail, just give the reader a sketch of the design space.

    5. Unresolved questions: What issues area still outstanding in the design? This needn't discuss outstanding implementation questions, we are presently only concerned with the conceptual design of your idea.

    Note that proposals are written in ReStructuredText rather than Markdown for its expressiveness and ease of integration into other GHC infrastructure. See the GHC Users Guide for a brief introduction to ReStructuredText.

  3. When you feel your proposal document is complete, push your branch to your fork (e.g. git push origin fancy-new-idea), and open a Pull Request requesting that your branch be merged into the master branch of the haskell/ecosystem-proposals repository. If you unfamiliar with GitHub pull requests then see the relevant documentation.

    Be sure to include a link to the rendered view of your proposal in the pull request description. Your proposal will automatically be announced on the TBD, probably haskell-cafe mailing list when this pull request is opened.

  4. Discussion will proceed on the pull request; it is very likely that multiple iterations will be necessary before the proposal stabilizes. If your proposal involves changes in multiple projects, make sure that representatives of each project are involved in the discussion.

  5. Unlike the GHC proposals process, there is no committee who will be responsible to approve or reject your proposal. This is because the ecosystem consists of many separate projects, and nobody has the authority to tell the contributors of those projects that they must now implement something because a committee has decided so. Instead, you need to get buy-in from representatives of each involved project. Once it is clear to you that they will go forward with the implementation, please add a comment stating that you consider your proposal accepted and one of the maintainers of this repository will mark it as accepted.

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