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5HT committed Jun 4, 2017
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<div class="article">
<div class="toc">
<!--TOC section id="sec1" TOC-->
<h2 id="sec1" class="section">TOC</h2><!--SEC END -->
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<!--SEC END --><p>
<a href="http://synrc.com/apps/mad/doc/web">Overview</a> <br>

<a href="http://synrc.com/apps/mad/doc/web/setup.htm">1. Setup</a> <br>

<a href="http://synrc.com/apps/mad/doc/web/deps.htm">2. Deps</a> <br>

<a href="http://synrc.com/apps/mad/doc/web/config.htm">3. Configuration</a> <br>

<a href="http://synrc.com/apps/mad/doc/web/commands.htm">4. Commands</a> <br>

<a href="http://synrc.com/apps/mad/doc/web/bundles.htm">5. Bundles</a> <br>

<a href="http://synrc.com/apps/mad/doc/book.pdf">Download PDF</a> <br>

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<!--TOC section id="sec3" MAD: Erlang Containers-->
<h2 id="sec3" class="section">MAD: Erlang Containers</h2><!--SEC END -->
<!--TOC subsection id="sec4" Purpose-->
<h3 id="sec4" class="subsection">Purpose</h3><!--SEC END --><p>
We were trying to make something minimalistic that fits out <a href="https://github.com/synrc">application stack</a>.
The main idea of mad is to provide clean and simple rebar-like fast dependency manager that
is able to build several types of packages and provides interface of containered deployments
to virtualiezed environments.</p>
<!--TOC subsection id="sec5" Several Types of Packaging-->
<h3 id="sec5" class="subsection">Several Types of Packaging</h3><!--SEC END --><p>
The key feature of mad is ability to create single-file bundled web sites.
This target escript is ready to run on Windows, Linux and Mac.</p>
<!--TOC subsection id="sec6" Deployment Options-->
<h3 id="sec6" class="subsection">Deployment Options</h3><!--SEC END --><p>
As a deploy tool mad is also supposed to launch, start, stop and manage containers, locally or remote.
You can make containers from different type of packages, like making runc container with beam release.</p>
<!--TOC subsection id="sec7" OTP Compliant-->
<h3 id="sec7" class="subsection">OTP Compliant</h3><!--SEC END --><p>
Mad supports ERTS boot files generation with systools and erlang application format used by OTP.
This is the main format of application repository. Also boot files are suported on both LING and BEAM.</p>
<!--TOC subsection id="sec8" Tiny Size-->
<h3 id="sec8" class="subsection">Tiny Size</h3><!--SEC END --><p>
And the good part:</p><div class="lstlisting"> Sources Binary
mad 967 LOC 52 KB
rebar 7717 LOC 181 KB</div>
<!--TOC subsection id="sec9" History-->
<h3 id="sec9" class="subsection">History</h3><!--SEC END --><p>We came to conclusion that no matter how perfect your libraries are,
the comfort and ease come mostly from developing tools.
Everything got started when <a href="https://github.com/proger">Vladimir Kirillov</a> decided to
replace Rusty’s sync beam reloader. As you know sync uses
filesystem polling which is neither energy-efficient nor elegant. Also
sync is only able to recompile separate modules while
common use-case in N2O is to recompile DTL templates
and LESS/SCSS stylesheets. That is why we need to recompile
the whole project. That’s the story how <a href="https://github.com/synrc/active">active</a> emerged.
Under the hood active is a client subscriber
of <a href="https://github.com/synrc/fs">fs</a> library, native filesystem listener for Linux, Windows and Mac.</p><p>De-facto standard in Erlang world is rebar.
We love rebar interface despite its implementation.
First we plugged rebar into active and then decided to drop its support,
it was slow, especially in cold recompilation.
It was designed to be a stand-alone tool, so it has some
glitches while using as embedded library.
Later we switched to Makefile-based build tool <a href="https://github.com/synrc/otp.mk">otp.mk</a>.</p><p>The idea to build rebar replacement was up in the air for a long time.
The best minimal approach was picked up by <a href="https://github.com/s1n4">Sina Samavati</a>,
who implemented the first prototype called ’mad’. Initially mad
was able to compile DTL templates, YECC files, escript (like
bundled in gproc), also it had support for caching with side-effects.
In a month I forked mad and took over the development under the same name.</p><div class="center">Listing 1: Example of building N2O sample</div><p><br>
</p><div class="lstlisting"> Cold Hot
rebar get-deps compile 53.156s 4.714s
mad deps compile 54.097s 0.899s</div><div class="center">Listing 2: Example of building Cowboy</div><p><br>
</p><div class="lstlisting"> Hot
make (erlang.mk) 2.588s
mad compile 2.521s</div><p>

<br><br>
<h2><a name="testimonials"><b>About MAD</b></a></h2><blockquote>At the beginning, Mad was supposed to be only a Rebar-compatible dependency manager, after a while,
I realized compiling applications as fast as possible with it could be a fascinating work as well.
<div align=right>Sina Samavati,
<a href="https://github.com/s1n4">Original MAD Author</a></div></blockquote>



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