rapid: Rapid prototyping with GHCi: hot reloading of running components and reload-surviving values

[ bsd3, development, library ] [ Propose Tags ]

This package provides a rapid prototyping suite for GHCi that can be used standalone or integrated into editors. You can hot-reload individual running components as you make changes to their code. It is designed to shorten the development cycle during the development of long-running programs like servers, web applications and interactive user interfaces.

It can also be used in the context of batch-style programs: Keep resources that are expensive to create in memory and reuse them across module reloads instead of reloading/recomputing them after every code change.

Technically this package is a safe and convenient wrapper around foreign-store.

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Versions [RSS] 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4
Change log CHANGELOG.md
Dependencies async (>=2.1 && <3), base (>=4.8 && <5), containers (>=0.5 && <1), foreign-store (>=0.2 && <1), stm (>=2.4 && <3) [details]
License LicenseRef-Apache
Copyright Copyright 2016 Ertugrul Söylemez
Author Ertugrul Söylemez <esz@posteo.de>
Maintainer Ertugrul Söylemez <esz@posteo.de>
Category Development
Home page http://hub.darcs.net/esz/rapid
Bug tracker http://hub.darcs.net/esz/rapid/issues
Source repo head: darcs get http://hub.darcs.net/esz/rapid
Uploaded by esz at 2016-07-11T21:22:04Z
Distributions NixOS:0.1.4
Downloads 3089 total (14 in the last 30 days)
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Readme for rapid-0.1.2

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Copyright 2016 Ertugrul Söylemez

Licensed under the Apache License, Version 2.0 (the "License"); you may not use these files except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.


This is a helper library for rapid prototyping in GHCi sessions. It provides hot-reloadable background threads as well as values that can be reused across module reloads (to save initialisation time). Main use cases include the development of long-running applications, especially those with multiple separable units: servers, web applications, interactive user interfaces, etc.

A tutorial-style introduction is contained within the Rapid module.