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53 lines
2.8 KiB
Markdown
53 lines
2.8 KiB
Markdown
The Unison language
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===================
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[](https://travis-ci.org/unisonweb/unison)
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[Unison](https://unisonweb.org) is a new programming language, currently under active development. It's a modern, statically-typed purely functional language, similar to Haskell, but with the ability to describe entire distributed systems with a single program. Here's an example of a distributed map-reduce implementation:
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```Haskell
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-- comments start with `--`
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mapReduce loc fn ifEmpty reduce data = match split data with
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Empty -> ifEmpty
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One a -> fn a
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Two left right ->
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fl = at loc '(mapReduce loc fn ifEmpty reduce !left)
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fr = at loc '(mapReduce loc fn ifEmpty reduce !right)
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reduce !fl !fr
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```
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This function can be either simulated locally (possibly with faults injected for testing purposes), or run atop a distributed pool of compute.
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If you'd like to learn more about the project, [this Strange Loop talk is a good introduction](https://www.youtube.com/watch?v=gCWtkvDQ2ZI). You can also follow along with [project website](https://unisonweb.org) or you can also say hello or lurk [in the Slack chat](https://unisonweb.org/slack).
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We are currently alpha testing Unison. If you'd like to participate in alpha testing, you can go to [the docs site](https://www.unisonweb.org/docs) to get started.
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Building using Stack
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--------------------
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If these instructions don't work for you or are incomplete, please file an issue.
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The build uses [Stack](http://docs.haskellstack.org/). If you don't already have it installed, [follow the install instructions](http://docs.haskellstack.org/en/stable/README.html#how-to-install) for your platform. (Hint: `brew update && brew install stack`)
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```sh
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$ git clone https://github.com/unisonweb/unison.git
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$ cd unison
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$ stack --version # we'll want to know this version if you run into trouble
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$ stack build && stack exec tests && stack exec unison
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```
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To run a local codebase-ui while building from source, you can use the `/dev-ui-install.sh` script. It will download the latest release of the codebase-ui and put it in the expected location for the unison executable created by `stack build`. When you start unison, you'll see a url where the codebase-ui is running.
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See [`development.markdown`](development.markdown) for a list of build commands you'll likely use during development.
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Codebase Server
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---------------
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When `ucm` starts it starts a Codebase web server that is used by the
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[Codebase UI](https://github.com/unisonweb/codebase-ui). It selects a random
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port and a unique token that must be used when starting the UI to correctly
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connect to the server.
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The port, host and token can all be configured by providing environment
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variables when starting `ucm`: `UCM_PORT`, `UCM_HOST`, and `UCM_TOKEN`.
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