rebar

rebar 3.0 is an Erlang build tool that makes it easy to compile and test Erlang applications, port drivers and releases.

rebar is a self-contained Erlang script, so it's easy to distribute or even embed directly in a project. Where possible, rebar uses standard Erlang/OTP conventions for project structures, thus minimizing the amount of build configuration work. rebar also provides dependency management, enabling application writers to easily re-use common libraries from a variety of locations (hex.pm, git, hg, and so on).

3.0 Beta-1

DOCUMENTATION

Commands

Command	Description
as	Higher-order provider to run multiple tasks in sequence as certain profiles
compile	Build project
clean	Remove project apps beam files
cover	Generate coverage info from data compiled by `eunit --cover` or `ct --cover`
ct	Run Common Test suites
deps	Lists dependencies currently in use
do	Higher-order provider to run multiple tasks in sequence
dialyzer	Run the Dialyzer analyzer on the project
edoc	Generate documentation using edoc
escriptize	Generate escript of project
eunit	Run eunit tests
help	Print help for rebar or task
new	Create new rebar project from templates
pkgs	List available packages
plugins	List or upgrade plugins
release	Build release of project
relup	Creates relup from 2 releases
report	Report on environment and versions for bug reports
shell	Run shell with project apps in path
tar	Package release into tarball
unlock	Unlock dependencies
update	Update package index
upgrade	Fetch latest version of dep
version	Print current version of Erlang/OTP and rebar
xref	Run cross reference analysis on the project

A more complete list can be found on the docs page

Changes

Since Rebar 2.x

Fetches and builds deps if missing when running any command that relies on them
Automatically recognizes apps and lib directory structure
Relx for releases and relups
deterministic builds and conflict resolution
New plugin handling mechanism
New hook mechanism
Support for packages
A ton more

Gone

Reltool integeration
Quickcheck integration (moved to a plugin)
C code compiling (moved to a plugin or hooks)

Providers

Providers are the modules that do the work to fulfill a user's command.

Example:

-module(rebar_prv_something).

-behaviour(rebar_provider).

-export([init/1,
         do/1,
         format_error/1]).

-define(PROVIDER, something).
-define(DEPS, []).

%% ===================================================================
%% Public API
%% ===================================================================

-spec init(rebar_state:state()) -> {ok, rebar_state:state()}.
init(State) ->
    State1 = rebar_state:add_provider(State, rebar_provider:create([{name, ?PROVIDER},
                                                                    {module, ?MODULE},
                                                                    {bare, false},
                                                                    {deps, ?DEPS},
                                                                    {example, "rebar dummy"},
                                                                    {short_desc, "dummy plugin."},
                                                                    {desc, ""},
                                                                    {opts, []}])),
    {ok, State1}.

-spec do(rebar_state:state()) -> {ok, rebar_state:state()}.
do(State) ->
    %% Do something
    {ok, State}.

-spec format_error(any()) -> iolist().
format_error(Reason) ->
    io_lib:format("~p", [Reason]).

Building

Recommended installation of Erlang/OTP is source built using erln8 or kerl. For binary packages use those provided by Erlang Solutions, but be sure to choose the "Standard" download option or you'll have issues building projects.

Dependencies

To build rebar you will need a working installation of Erlang R15 (or later).

Should you want to clone the rebar repository, you will also require git.

Downloading

You can download a pre-built binary version of rebar3 based on the last commit from:

https://s3.amazonaws.com/rebar3/rebar3

Bootstrapping rebar3

$ git clone https://github.com/rebar/rebar3
$ cd rebar3
$ ./bootstrap

Developing on rebar3

When developing you can simply run escriptize to build your changes but the new escript is under _build/default/bin/rebar3

$ ./rebar3 escriptize
$ _build/default/bin/rebar3

Contributing to rebar

Please refer to CONTRIBUTING.

Community and Resources

In case of problems that cannot be solved through documentation or examples, you may want to try to contact members of the community for help. The community is also where you want to go for questions about how to extend rebar, fill in bug reports, and so on.

The main place to go for questions is the rebar mailing list. If you need quick feedback, you can try the #rebar channel on irc.freenode.net. Be sure to check the documentation first, just to be sure you're not asking about things with well known answers.

For bug reports, roadmaps, and issues, visit the github issues page.

General rebar community resources and links:

zugolosian/rebar3