Requirements¶
Install Erlang¶
First, the Erlang programming language needs to be installed.
VALEO requires Erlang version R15B02 (recommended) or above.
Windows¶
These steps are for Erlang version R15B01. Adapt them for R15B02 of course.
Depending on your architecture (32/64-bit), download the right binary for Windows at:
Then, follow the standard install procedure using the wizzard.
Step 1/4
Install wizard for Windows
Please, make sure the Microsoft Visual C++ 2010 Redistributable Package has been installed on your system correctly.
For this:
a. check the Microsoft DDL’s (present) checkbox in the Erlang installer.
b. or manually download the package from the Microsoft’s download center website.
VALEO will not work if the package is not found.
Step 2/4
Pay attention to the destination folder name and select one without spaces.
Avoid: “c:\Program Files”, “c:\Program Files (x86)”, “C:\Program Files (x64)”, etc.
and prefer: c:\erl5.9.1\ for Win32 and c:\x64\erl5.9.1\ for Win64.
Step 3/4
Adjust your Path system environment variable by appending the fullpath to
Erlang’s binaries: c:\erl5.9.1\bin;
Now, you can run the Erlang’s VM from everywhere.
Step 4/4
The preferred way to start the Erlang system for interactive use on Windows is:
c:\> werl
Linux¶
Linux installation could be performed by compiling Erlang from source (advanced users)
or by installing pre-compiled binaries. This second option is highly recommended.
Binaries (.rpm, .deb) for all major distributions (Debian, Ubuntu, CentOS, Fedora,
etc.) are available at:
Repositories are also available to use with your favourite packages manager.
Once installed, your Erlang VM should be under:
/usr/local/lib/erlang
Append this to your PATH environment variable:
$ export PATH=$PATH:/usr/local/lib/erlang/bin
To make this persistent (system wide or user specific), use one of the
following
files or better check with your distribution:
/etc/profile.local
/etc/bash.bashrc.local
$HOME/.profile
$HOME/.bashrc
Then, give it a try;
$ erl
Mac OSX¶
DMG install wizard is also provided to Mac users. The install procedure is almost identical to Linux.
Grab one that fits you at:
Then, run the installer.
Once installed, your Erlang VM should be under:
/usr/local/lib/erlang
Append this to your PATH environment variable (see above how to make it persistent):
$ export PATH=$PATH:/usr/local/lib/erlang/bin
Finaly, check everything’s fine:
$ erl
Other Operating Systems
Drop us a line if interested to use VALEO on FreeBSD, SmartOS, etc. We’ll provide you with a detailed instructions and binaries.
Take a breath¶
Lets start with a simple demo, the famous “Hello Web Archiving”.
Save the following code in a file called: hello.erl
-module(hello).
-export([webarch/0]).
webarch() ->
io:format("VALEO says: Hello Web Archiving!~n"),
halt().
Then, compile and run:
c:\> erlc hello.erl
c:\> erl -noshell -s hello webarch
VALEO says: Hello Web Archiving!
Any text editor for my code?¶
All major IDEs and text editors provide support for Erlang code.
- Eclipse IDE with Erlide plugin
- NetBeans IDE with Erlybird plugin
- IntelliJ IDE with IntelliJErlang plugin
- SciTE editor
- NotePad++ editor
- JEdit editor
- Emacs
- Vi
- KomodoEdit, a fast, smart, free and open-source code editor
- SublimText2 editor with SublimErl plugin: easy to use, lightweight with binaries for Windows, Linux and Mac OSX.
SublimText2 in action
Where can I get more information?¶
Erlang is a simple functional programming language. Even though the learning
curve is bit steep, you will get more out of it since you will be learning a
functional programming language.
Also, since Erlang was specifically designed to create reliable, highly
concurrent systems, you will learn plenty about creating highly scalable software.
Rather few, but excellent books are available out there.
Learn You Some Erlang (LYSE)
LYSE website provides one of the best, free, complete, and well presented Erlang tutorials to quickly get started.
Help¶
Aleph Archives is providing a forum in which you can find valuable VALEO topics, share ideas,
and ask Erlang questions related to VALEO.
