2017-01-22 23:31:14 +00:00
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# ghc-mod: Happy Haskell Hacking
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[](https://gitlab.com/dxld/ghc-mod/commits/master)
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2013-05-22 03:04:05 +00:00
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2017-01-22 23:31:14 +00:00
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ghc-mod is a couple of different things depending on what you want to do, you
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should read the corresponding section:
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2013-05-22 03:04:05 +00:00
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2017-01-22 23:31:14 +00:00
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- for [all Haskell developers (Using ghc-mod in your development environment)](#using-ghc-mod-in-your-development-environment)
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- for [people developing Haskell IDEs (Using ghc-mod as an IDE backend program)](#using-ghc-mod-as-an-ide-backend-program)
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- for [developing Haskell tooling (Using ghc-mod as a library)](#using-ghc-mod-as-a-library)
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2014-05-19 07:42:34 +00:00
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2017-01-22 23:31:14 +00:00
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## Overview
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2014-09-12 05:02:34 +00:00
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2017-01-22 23:31:14 +00:00
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### Using ghc-mod in your Development Environment<a name="haskell-dev"></a>
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2014-05-19 07:25:38 +00:00
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2017-01-22 23:31:14 +00:00
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To use `ghc-mod` in your development environment of choice you need two things:
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2014-05-19 07:25:38 +00:00
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2017-01-22 23:31:14 +00:00
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- The `ghc-mod` program included in the package of the same name, see [Installing](https://github.com/DanielG/ghc-mod/wiki/Installing)
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- A ghc-mod frontend to integrate it into your development environment, see [Frontend](https://github.com/DanielG/ghc-mod/wiki/Frontend)
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2014-05-19 07:25:38 +00:00
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2017-01-22 23:31:14 +00:00
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### Using ghc-mod as an IDE Backend Program<a name="ide-dev"></a>
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2014-05-19 07:35:38 +00:00
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2017-01-22 23:31:14 +00:00
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Directly using ghc-mod is while still supported for the time being
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discouraged. You should look into working with
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[`haskell-ide-engine`](https://github.com/haskell/haskell-ide-engine) instead.
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2014-12-16 20:34:04 +00:00
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2017-01-22 23:31:14 +00:00
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The `ghc-mod` backend program is somewhat crusty and carries a lot of legacy
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baggage so going forward we would like to see frontends use `haskell-ide-engine`
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instead. There we're trying to get the design right from the beginning and fix
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the fragmentation of the Haskell Tooling Ecosystem along the way.
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2014-12-16 20:34:04 +00:00
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2017-01-22 23:31:14 +00:00
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### Using ghc-mod as a Library<a name="tool-dev"></a>
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2014-09-12 05:02:34 +00:00
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2017-01-22 23:31:14 +00:00
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Internally ghc-mod uses the Glasgow Haskell Compilers's API to implement most of
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it's functionality.
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2014-09-12 05:02:34 +00:00
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2017-01-22 23:31:14 +00:00
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In order to provide a hassle free experience to users ghc-mod tries hard to
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automatically, and correctly, detect and if needed tweak the environment GHC
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needs. It also handles some of the more cumbersome parts of getting a working
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compiler session up and running.
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2014-09-12 05:02:34 +00:00
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2017-01-22 23:31:14 +00:00
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This functionality can be very useful to all kinds of Haskell development tools
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therefore want to expose all the useful abstractions ghc-mod provides.
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2014-09-12 05:02:34 +00:00
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2017-01-22 23:31:14 +00:00
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Right now the ghc-mod API is pretty messy a result major internal rewrites and
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reorganization coupled with too little time for cleanups over the course of
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almost 100 releases! We would like to make a cut during v6.0 or so and
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completely re-do the API but we need more input from downstream tool writers to
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do that properly, see [Library API Redesign](Library-API-Redesign.md).
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2015-03-03 11:18:54 +00:00
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2017-01-22 23:31:14 +00:00
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Right now tools like Alanz's
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[The Haskell Refactorer (HaRe)](https://github.com/alanz/HaRe) and
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[mote](https://github.com/imeckler/mote) use this environment handling so they
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can concentrate on their core functionality instead of worrying about
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environments.
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2015-03-03 11:18:54 +00:00
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2017-01-22 23:31:14 +00:00
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Most recently the
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[`haskell-ide-engine`](https://github.com/haskell/haskell-ide-engine) project
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has sprung up and if you're planning to write any kind of tool that needs editor
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integration eventually you should definetly look into that. `haskell-ide-engine`
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does uses `ghc-mod` at it's core so you'll want to be familliar with it either
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way.
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API "documentation" is here:
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[Hackage docs](http://hackage.haskell.org/package/ghc-mod-5.4.0.0/docs/Language-Haskell-GhcMod.html).
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2015-03-03 11:18:54 +00:00
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2014-09-12 05:02:34 +00:00
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## IRC
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2014-05-19 07:35:38 +00:00
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2014-09-12 05:02:34 +00:00
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If you have any problems, suggestions, comments swing by
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2015-03-28 01:35:36 +00:00
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[\#ghc-mod (web client)](https://kiwiirc.com/client/irc.freenode.org/ghc-mod) on
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Freenode. If you're reporting a bug please also create an issue
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2016-10-12 12:56:15 +00:00
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[here](https://github.com/DanielG/ghc-mod/issues) so we have a way to contact
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2015-03-28 01:35:36 +00:00
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you if you don't have time to stay.
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2015-03-05 15:52:11 +00:00
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Do hang around for a while if no one answers and repeat your question if you
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2015-03-28 01:35:36 +00:00
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still haven't gotten any answer after a day or so. You're most likely to get an
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answer during the day in GMT+1.
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