Import.scala

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A Scala compiler plugin for magic imports

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# Import.scala <a href="http://thoughtworks.com/"><img align="right" src="https://www.thoughtworks.com/imgs/tw-logo.png" title="ThoughtWorks" height="15"/></a>

[![Build Status](https://travis-ci.org/ThoughtWorksInc/Import.scala.svg?branch=master)](https://travis-ci.org/ThoughtWorksInc/Import.scala)

**Import.scala** is a Scala compiler plugin that enables magic imports.

## Setup

```sbt
addCompilerPlugin("com.thoughtworks.import" %% "import" % "latest.release")
```

## Magic Imports

This plugin provides a set of magic imports that let you load additional
code into a Scala source file: these are imports which start with a `$`.

The syntax is similar to [magic imports in Ammonite](http://www.lihaoyi.com/Ammonite/#MagicImports).

### `import $file`
     
This lets you load code snippets into current source file. For
example given a small script defining one value we want

```scala
// MyScript.sc
val elite = 31337
```

We can load it into our current source file using:

```scala
import $file.MyScript
assert(MyScript.elite == 31337)
```

If the script is in a sub-folder, simply use:

```scala
import $file.myfolder.MyScript
```

Or if the script is in an *outer* folder,

```scala
import $file.`..`.MyScript
```

Or if you want to import the contents of the script in one go:

```scala
import $file.MyScript, MyScript._
assert(elite == 31337)
```

Or if you want to download the script from a website:

```scala
import $file.`https://gist.github.com/Atry/5dcb1414b804fd7679393cacac3c89fc/raw/5b1748ab6b45c00be0109686fdb25e85cde11ce0/include-example.sc`
assert(`https://gist.github.com/Atry/5dcb1414b804fd7679393cacac3c89fc/raw/5b1748ab6b45c00be0109686fdb25e85cde11ce0/include-example.sc`.i == 42)
```

Or if you prefer using dot as the path separator:

```scala
import $file.`https://gist.github.com`.Atry.`5dcb1414b804fd7679393cacac3c89fc`.raw.`5b1748ab6b45c00be0109686fdb25e85cde11ce0`.`include-example`
assert(`include-example`.i == 42)
```

While this is a trivial example, your `MyScript.sc` file can
contain anything you want, not just `val`s: function
`def`s, `class`es `object`s or
`trait`s, or `import`s from *other* scripts.

#### Cannot directly import from inside a Script

You cannot import things from "inside" that script in
one chain:
```scala
import $file.MyScript._
```

Rather, you must always import the script-object first, and then import
things from the script object after:

```scala
import $file.MyScript, MyScript._
```
#### Renamed-scripts and multiple-scripts

You can re-name scripts on-import if you find their names are
colliding:

```scala
import $file.{MyScript => FooBarScript}, FooBarScript._
```

Or re-name a URL:

```scala
import $file.{ `https://gist.github.com/Atry/5dcb1414b804fd7679393cacac3c89fc/raw/5b1748ab6b45c00be0109686fdb25e85cde11ce0/include-example.sc` => Renamed}
assert(Renamed.i == 42)

```
Or import multiple scripts at once

```scala
import $file.{MyScript, MyOtherScript}
```

These behave as you would expect imports to work. Note that when
importing multiple scripts, you have to name them explicitly and
cannot use wildcard `._` imports:

```scala
import $file._ // doesn't work
```

### `import $url`

`import $url` is an alias to `import $file`.

### `import $exec`
        
This is similar to `import $file`, except that it dumps the definitions and imports from the script into your current source file.
This is useful if you are using a script to hold a set of common imports.

```scala
import $exec.MyScript
assert(elite == 31337)
```

```scala
import $exec.`https://gist.github.com/Atry/5dcb1414b804fd7679393cacac3c89fc/raw/5b1748ab6b45c00be0109686fdb25e85cde11ce0/include-example.sc`
assert(i == 42)
```

## Acknowledgements

The examples in this README.md file is based on Li Haoyi's [Ammonite document](http://www.lihaoyi.com/Ammonite/#MagicImports) and copyright licensed under MIT. See the [Markdown source](https://github.com/ThoughtWorksInc/import.scala/raw/master/README.md).

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