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https://www.jetbrains.com/help/idea/getting-started-with-erlang.html

Getting Started with Erlang

Erlang is a great language that lets you build highly concurrent applications. This tutorial will teach you how to quickly get started with it.

In this section:

Preliminary steps

Installing Erlang OTP

The first thing for setting up an Erlang environment is installing Erlang OTP, a set of Erlang libraries essential for development.

Windows

If you are a Windows user, download the Erlang OTP package and run the installation wizard. Once the installation is over, add the installation path plus \bin to the PATH environment variable.

macOS

If you are an macOS user, to install Erlang OTP, type the following at the Terminal prompt (make sure you have Homebrew installed on your machine):

brew install erlang

If you prefer MacPorts to Homebrew, your command line should be different:

port install erlang +ssl

Linux

The installation process for Linux is similar to macOS, except that instead of brew or port you have to use apt-get (a Linux package management utility):

apt-get install erlang

Verifying Erlang OTP installation

To verify that Erlang OTP is installed correctly, run the Erlang shell by typing erl in a Terminal prompt:

erlang otp

To learn more about the Erlang shell, read its user guide.

Installing Rebar

In addition to Erlang OTP, you’ll also need Rebar, a build tool that helps compile and test Erlang applications. The easiest way to install it on your machine is to download its sources and build it locally:

git clone git://github.com/rebar/rebar.git $ cd rebar $ ./bootstrap Recompile: src/getopt ... Recompile: src/rebar_utils ==> rebar (compile)

Congratulations! You now have a self-contained script called "rebar" in your current working directory. Place this script anywhere in your path and you can use rebar to build OTP-compliant apps.

Setting up IntelliJ IDEA

Now when Erlang OTP and Rebar are set up, it’s time to download and install IntelliJ IDEA. Keep in mind, that for Erlang development you can use IntelliJ IDEA Community Edition (which is free and open-source).

Once the IDE is up and you see its Welcome screen, go to Configure | Plugins, then click Browse repositories, locate the Erlang plugin and install it:

erlang plugin

After installing the plugin, restart IntelliJ IDEA.

Configuring an Erlang SDK

One more thing you’ll have to do to configure IntelliJ IDEA is to add an Erlang SDK.

To do that, change the structure of the default project. Open the default project structure in one of the two ways:

  • On the Welcome screen, go to Configure | Project Defaults | Project Structure
  • On the main menu, choose File | Other Settings | Default Project Structure

Then, add an Erlang SDK by specifying the path to the Erlang OTP installation directory.

erlang sdk

If you don’t know where Erlang OTP was installed, check the following directories:

  • WindowsC:\Program Files\erl<version>
  • Linux/usr/lib/erlang/<version>
  • MacPorts, macOS/opt/local/lib/erlang/<version>
  • Homebrew, macOS/usr/local/Cellar/erlang/<version>

Configuring Rebar

The final adjustment you have to do is to specify the path to Rebar, so that IntelliJ IDEA can run Rebar commands from the IDE.

You can do it via Configure | Preferences | Other Settings → Erlang External Tools:

erlang rebar configure

Creating a new project

Creating an Erlang project

There are several ways to create a new Erlang project. The easiest one is to use the New Project Wizard from the Welcome screen.

Click Create New Project:

erlang create new project

Then choose Erlang in the left pane, and click Next.

erlang create new project erlang

IntelliJ IDEA prompts you to choose an Erlang SDK (which you've already configured):

erlang create new project sdk

After that you’ll be asked to specify the name of your project and its directory. The following image shows the resulting Erlang project with the name ErlangDemo:

erlang project

Creating a Rebar project

Instead of a pure Erlang project, you might want to create a Rebar project. To do that, type the following code at the Terminal prompt:

rebar create-app appid=<project name>

Once the project has been created, import it into IntelliJ IDEA to make it possible to open this project in the IDE.

Importing a project into IntelliJ IDEA

You can import a project into IntelliJ IDEA in several ways. Let's explore importing from the Welcome screen.

To import an existing project into IntelliJ IDEA, click Import on the Welcome Screen, and choose the project directory. IntelliJ IDEA offers you to either import the project from existing sources, or from an external model (a build file).

If your project uses Rebar, select the corresponding option when asked.

erlang import project

When importing a Rebar project, make sure to enable the option Fetch dependencies with rebar:

erlang import project fetch

Running and debugging an application

To run an application, you have to create a run/debug configuration created against the stub Erlang Application. To do this, on the main menu choose Run | Edit Configurations, select the stub Erlang Application, specify the name (here it is hello.hello_world), and specify the application’s module and function:

erlang run config

After that you’ll be able to run your application via the main menu (Run | Run <run configuration name>, the toolbar (run), or a even a shortcut (Ctrl+Shift+F10).

Once you have a run/debug configuration, you can also debug your application via the main menu (Run | Debug ‘<run configuration name>, the toolbar (debug), or a shortcut (Shift+F9):

erlang debug

For more information, refer to the concept of a run/debug configuration and the procedural sections Running Applications and Debugging.

Running Eunit tests

Running Eunit tests is similar to running an application, but needs a different run/debug configuration, created against the stub Erlang Eunit:

erlang eunit config

IntelliJ IDEA provides a handy Test Runner with support for Eunit. It shows test results, lets you rerun tests of you choice, jump to failed tests, etc.:

erlang test

Running Rebar commands

Running Rebar commands is also possible right from the IDE – with the help of the Erlang Rebar run/debug configuration:

erlang rebar run config

Note that if your Rebar commands run tests, you can use a Erlang Rebar Eunit run/debug configuration to see test results in a Test Runner.

Additional

Learning Erlang

To learn Erlang, we recommend that you start by reading the official Erlang user guide, and of course the Learn You Some Erlang for Great Good tutorial by Fred Hebert.

Learning IntelliJ IDEA

IntelliJ IDEA is a Java IDE in the first place, however it’s also a platform and IDE for other languages, such as Erlang, Python, Ruby, PHP, and many other. To learn more about IntelliJ IDEA, it’s worth checking out the section Discover IntelliJ IDEA and watch the Video Tutorials.

If you have a question, you can always ask it on StackOverflow (probably it’s already answered).

Providing Feedback

In case you’d like to share your feedback about IntelliJ IDEA or its support for Erlang, feel free to submit an issue in Erlang plugin GitHub repository, or to the IntelliJ IDEA issue tracker.

Refer to the section Reporting Issues and Sharing Your Feedback.

posted on 2018-01-22 13:49 思月行云 閱讀(951) 評(píng)論(0)  編輯 收藏 引用 所屬分類: Erlang
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