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  <title><![CDATA[Paulo de Tarço]]></title>
  <link href="http://ptarcode.github.io/atom.xml" rel="self"/>
  <link href="http://ptarcode.github.io/"/>
  <updated>2018-03-14T22:26:36-03:00</updated>
  <id>http://ptarcode.github.io/</id>
  <author>
    <name><![CDATA[Paulo de Tarço]]></name>
    <email><![CDATA[ptarcode@gmail.com]]></email>
  </author>
  <generator uri="http://octopress.org/">Octopress</generator>

  
  <entry>
    <title type="html"><![CDATA[3 Profilers Tools]]></title>
    <link href="http://ptarcode.github.io/blog/2018/03/14/3-profilers-tools/"/>
    <updated>2018-03-14T21:12:00-03:00</updated>
    <id>http://ptarcode.github.io/blog/2018/03/14/3-profilers-tools</id>
    <content type="html"><![CDATA[<!--more-->


<h3>What is it?</h3>

<p>In software engineering, profiling (&ldquo;program profiling&rdquo;, &ldquo;software profiling&rdquo;) is a form of dynamic program analysis that measures, for example, the space (memory) or time complexity of a program, the usage of particular instructions, or the frequency and duration of function calls. Most commonly, profiling information serves to aid program optimization.</p>

<p>Profiling is achieved by instrumenting either the program source code or its binary executable form using a tool called a profiler (or code profiler). Profilers may use a number of different techniques, such as event-based, statistical, instrumented, and simulation methods.</p>

<p><a href="https://en.wikipedia.org/wiki/Profiling" title="Title">Font: https://en.wikipedia.org</a></p>

<h3>Gprof</h3>

<p>Gprof produces an execution profile of C, Pascal, or Fortran77 programs. The effect of called routines is incorporated in the profile of each caller. The profile data is taken from the call graph profile file (gmon.out default) which is created by programs that are compiled with the -pg option of cc, pc, and f77. The -pg option also links in versions of the library routines that are compiled for profiling. Gprof reads the given object file (the default is a.out) and establishes the relation between its symbol table and the call graph profile from gmon.out. If more than one profile file is specified, the gprof output shows the sum of the profile information in the given profile files.
Gprof calculates the amount of time spent in each routine. Next, these times are propagated along the edges of the call graph. Cycles are discovered, and calls into a cycle are made to share the time of the cycle.
Several forms of output are available from the analysis.
The flat profile shows how much time your program spent in each function, and how many times that function was called. If you simply want to know which functions burn most of the cycles, it is stated concisely here.
The call graph shows, for each function, which functions called it, which other functions it called, and how many times. There is also an estimate of how much time was spent in the subroutines of each function. This can suggest places where you might try to eliminate function calls that use a lot of time.
The annotated source listing is a copy of the program’s source code, labeled with the number of times each line of the program was executed.</p>

<p>Step 1. Enable profiling during compilation (use -pg option)</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ gcc -pg -o TestGprof TestGprof.c</span></code></pre></td></tr></table></div></figure>


<p>Step 2. Execute the binary so that profiling data is generated</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ ./TestGprof</span></code></pre></td></tr></table></div></figure>


<p>If the profiling is enabled then on executing the program, file gmon.out will be generated.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ ls gmon.out  TestGprof  TestGprof.c</span></code></pre></td></tr></table></div></figure>


<p>Step 3. Run gprof on profiling data</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ gprof -b TestGprof gmon.out > analysis.out</span></code></pre></td></tr></table></div></figure>


<p>Below are the contents of analysis.out</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
<span class='line-number'>23</span>
<span class='line-number'>24</span>
<span class='line-number'>25</span>
<span class='line-number'>26</span>
<span class='line-number'>27</span>
<span class='line-number'>28</span>
<span class='line-number'>29</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>Flat profile:
</span><span class='line'>
</span><span class='line'>Each sample counts as 0.01 seconds.
</span><span class='line'>  %   cumulative   self              self     total
</span><span class='line'> time   seconds   seconds    calls   s/call   s/call  name
</span><span class='line'>100.55     20.38    20.38      100     0.20     0.20  StaticFunc
</span><span class='line'>  0.00     20.38     0.00        1     0.00    20.38  TestFunc
</span><span class='line'>
</span><span class='line'>                        Call graph
</span><span class='line'>
</span><span class='line'>
</span><span class='line'>granularity: each sample hit covers 2 byte(s) for 0.05% of 20.38 seconds
</span><span class='line'>
</span><span class='line'>index % time    self  children    called     name
</span><span class='line'>               20.38    0.00     100/100         TestFunc [2]
</span><span class='line'>[1]    100.0   20.38    0.00     100         StaticFunc [1]
</span><span class='line'>-----------------------------------------------
</span><span class='line'>                0.00   20.38       1/1           main [3]
</span><span class='line'>[2]    100.0    0.00   20.38       1         TestFunc [2]
</span><span class='line'>               20.38    0.00     100/100         StaticFunc [1]
</span><span class='line'>-----------------------------------------------
</span><span class='line'>                                                 
</span><span class='line'>[3]    100.0    0.00   20.38                 main [3]
</span><span class='line'>                0.00   20.38       1/1           TestFunc [2]
</span><span class='line'>-----------------------------------------------
</span><span class='line'>
</span><span class='line'>Index by function name
</span><span class='line'>
</span><span class='line'>   [1] StaticFunc              [2] TestFunc</span></code></pre></td></tr></table></div></figure>


<p><a href="https://www.tutorialspoint.com/unix_commands/gprof.htm" title="Title">Font: https://www.tutorialspoint.com</a></p>

<h3>Valgrind</h3>

<p>Valgrind is a GPL&rsquo;d system for debugging and profiling Linux programs. With Valgrind&rsquo;s tool suite you can automatically detect many memory management and threading bugs, avoiding hours of frustrating bug-hunting, making your programs more stable. You can also perform detailed profiling to help speed up your programs.</p>

<h4>Memcheck</h4>

<p>Memcheck detects memory-management problems, and is aimed primarily at C and C++ programs. When a program is run under Memcheck&rsquo;s supervision, all reads and writes of memory are checked, and calls to malloc/new/free/delete are intercepted. As a result, Memcheck can detect if your program:
• Accesses memory it shouldn&rsquo;t (areas not yet allocated, areas that have been freed, areas past the end of heap blocks, inaccessible areas of the stack).
• Uses uninitialised values in dangerous ways.
• Leaks memory.
• Does bad frees of heap blocks (double frees, mismatched frees).
• Passes overlapping source and destination memory blocks to memcpy() and related functions.
Memcheck reports these errors as soon as they occur, giving the source line number at which it occurred, and also a stack trace of the functions called to reach that line. Memcheck tracks addressability at the byte-level, and initialisation of values at the bit-level. As a result, it can detect the use of single uninitialised bits, and does not report spurious errors on bitfield operations. Memcheck runs programs about 10&mdash;30x slower than normal.</p>

<h4>Cachegrind</h4>

<p>Cachegrind is a cache profiler. It performs detailed simulation of the I1, D1 and L2 caches in your CPU and so can accurately pinpoint the sources of cache misses in your code. It identifies the number of cache misses, memory references and instructions executed for each line of source code, with per-function, per-module and whole-program summaries. It is useful with programs written in any language. Cachegrind runs programs about 20&mdash;100x slower than normal.</p>

<h4>Callgrind</h4>

<p>Callgrind, by Josef Weidendorfer, is an extension to Cachegrind. It provides all the information that Cachegrind does, plus extra information about callgraphs. It was folded into the main Valgrind distribution in version 3.2.0. Available separately is an amazing visualisation tool, KCachegrind, which gives a much better overview of the data that Callgrind collects; it can also be used to visualise Cachegrind&rsquo;s output.</p>

<h4>Massif</h4>

<p>Massif is a heap profiler. It performs detailed heap profiling by taking regular snapshots of a program&rsquo;s heap. It produces a graph showing heap usage over time, including information about which parts of the program are responsible for the most memory allocations. The graph is supplemented by a text or HTML file that includes more information for determining where the most memory is being allocated. Massif runs programs about 20x slower than normal.</p>

<h4>Helgrind</h4>

<p>Helgrind is a thread debugger which finds data races in multithreaded programs. It looks for memory locations which are accessed by more than one (POSIX p-)thread, but for which no consistently used (pthread_mutex_) lock can be found. Such locations are indicative of missing synchronisation between threads, and could cause hard-to-find timing-dependent problems. It is useful for any program that uses pthreads. It is a somewhat experimental tool, so your feedback is especially welcome here.</p>

<p>You invoke Valgrind like this:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>valgrind [valgrind-options] your-prog [your-prog-options]</span></code></pre></td></tr></table></div></figure>


<p>The most important option is &mdash;tool which dictates which Valgrind tool to run. For example, if want to run the command ls -l using the memory-checking tool Memcheck, issue this command:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>valgrind --tool=memcheck ls -l</span></code></pre></td></tr></table></div></figure>


<p><a href="http://valgrind.org/" title="Title">Font: http://valgrind.org/</a></p>

<h3>Gperftools</h3>

<p>Gperftools is a collection of a high-performance multi-threaded malloc() implementation, plus some pretty nifty performance analysis tools.</p>

<p>Gperftools is distributed under the terms of the BSD License. Join our mailing list at <a href="&#x6d;&#x61;&#105;&#x6c;&#116;&#111;&#x3a;&#x67;&#x70;&#101;&#x72;&#x66;&#x74;&#111;&#x6f;&#x6c;&#115;&#64;&#103;&#111;&#111;&#x67;&#x6c;&#101;&#103;&#x72;&#111;&#117;&#x70;&#115;&#46;&#99;&#x6f;&#109;">&#x67;&#x70;&#x65;&#114;&#102;&#116;&#x6f;&#x6f;&#x6c;&#115;&#x40;&#x67;&#x6f;&#x6f;&#x67;&#108;&#x65;&#x67;&#x72;&#x6f;&#x75;&#112;&#115;&#x2e;&#99;&#x6f;&#x6d;</a> for updates:
<a href="https://groups.google.com/forum/#!forum/gperftools">https://groups.google.com/forum/#!forum/gperftools</a></p>

<p>Gperftools was original home for pprof program. But do note that original pprof (which is still included with gperftools) is now deprecated in favor of golang version at <a href="https://github.com/google/pprof">https://github.com/google/pprof</a></p>

<h4>TCMALLOC</h4>

<p>Just link in -ltcmalloc or -ltcmalloc_minimal to get the advantages of tcmalloc &mdash; a replacement for malloc and new.  See below for some environment variables you can use with tcmalloc, as well.</p>

<p>Tcmalloc functionality is available on all systems we&rsquo;ve tested; see INSTALL for more details.  See README_windows.txt for instructions on using tcmalloc on Windows.</p>

<p>NOTE: When compiling with programs with gcc, that you plan to link with libtcmalloc, it&rsquo;s safest to pass in the flags when compiling.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>-fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free</span></code></pre></td></tr></table></div></figure>


<p>Gcc makes some optimizations assuming it is using its own, built-in malloc; that assumption obviously isn&rsquo;t true with tcmalloc.  In practice, we haven&rsquo;t seen any problems with this, but the expected risk is highest for users who register their own malloc hooks with tcmalloc (using gperftools/malloc_hook.h).  The risk is
lowest for folks who use tcmalloc_minimal.</p>

<h4>HEAP PROFILER</h4>

<p>As a quick-start, do the following after installing this package:</p>

<p>1) Link your executable:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>-ltcmalloc</span></code></pre></td></tr></table></div></figure>


<p>2) Run your executable with the HEAPPROFILE environment var set:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ HEAPPROFILE=/tmp/heapprof &lt;path/to/binary> [binary args]</span></code></pre></td></tr></table></div></figure>


<p>3) Run pprof to analyze the heap usage</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ pprof &lt;path/to/binary> /tmp/heapprof.0045.heap  # run 'ls' to see options
</span><span class='line'>     $ pprof --gv &lt;path/to/binary> /tmp/heapprof.0045.heap</span></code></pre></td></tr></table></div></figure>


<p>You can also use LD_PRELOAD to heap-profile an executable that you didn&rsquo;t compile.</p>

<p>There are other environment variables, besides HEAPPROFILE, you can set to adjust the heap-profiler behavior; c.f. &ldquo;ENVIRONMENT VARIABLES&rdquo; below.</p>

<p>The heap profiler is available on all unix-based systems we&rsquo;ve tested; see INSTALL for more details.  It is not currently available on Windows.</p>

<h4>HEAP CHECKER</h4>

<p>In order to catch all heap leaks, tcmalloc must be linked <em>last</em> into your executable.  The heap checker may mischaracterize some memory accesses in libraries listed after it on the link line.  For instance, it may report these libraries as leaking memory when they&rsquo;re not.</p>

<p>Here&rsquo;s a quick-start for how to use:</p>

<p>1) Link your executable:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>-ltcmalloc</span></code></pre></td></tr></table></div></figure>


<p>2) Run your executable with the HEAPCHECK environment var set:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ HEAPCHECK=1 &lt;path/to/binary> [binary args]</span></code></pre></td></tr></table></div></figure>


<p>Other values for HEAPCHECK: normal (equivalent to &ldquo;1&rdquo;), strict, draconian</p>

<p>You can also use LD_PRELOAD to heap-check an executable that you didn&rsquo;t compile.</p>

<p>The heap checker is only available on Linux at this time.</p>

<h4>CPU PROFILER</h4>

<p>As a quick-start, do the following after installing this package:</p>

<p>1) Link your executable:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>-ltcmalloc</span></code></pre></td></tr></table></div></figure>


<p>2) Run your executable with the CPUPROFILE environment var set:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ CPUPROFILE=/tmp/prof.out &lt;path/to/binary> [binary args]</span></code></pre></td></tr></table></div></figure>


<p>3) Run pprof to analyze the CPU usage</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ pprof &lt;path/to/binary> /tmp/prof.out      # -pg-like text output
</span><span class='line'>     $ pprof --gv &lt;path/to/binary> /tmp/prof.out # really cool graphical output</span></code></pre></td></tr></table></div></figure>


<p>There are other environment variables, besides CPUPROFILE, you can set to adjust the cpu-profiler behavior; cf &ldquo;ENVIRONMENT VARIABLES&rdquo; below.</p>

<p>The CPU profiler is available on all unix-based systems we&rsquo;ve tested; see INSTALL for more details.  It is not currently available on Windows.</p>

<p>NOTE: CPU profiling doesn&rsquo;t work after fork (unless you immediately do an exec()-like call afterwards).  Furthermore, if you do fork, and the child calls exit(), it may corrupt the profile data.  You can use _exit() to work around this.  We hope to have a fix for both problems in the next release of perftools (hopefully perftools 1.2).</p>

<p><a href="https://github.com/gperftools/gperftools" title="Title">Font: https://github.com/gperftools/gperftools</a></p>

<hr />
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[Eliza - First computer programs to process natural language.]]></title>
    <link href="http://ptarcode.github.io/blog/2016/02/19/eliza-first-computer-programs-to-process-natural-language/"/>
    <updated>2016-02-19T23:01:00-02:00</updated>
    <id>http://ptarcode.github.io/blog/2016/02/19/eliza-first-computer-programs-to-process-natural-language</id>
    <content type="html"><![CDATA[<!--more-->


<p>One of the first computer programs to process natural language was &ldquo;Eliza,&rdquo; named after the gabby heroine in Shaw&rsquo;s play Pygmalion. The Eliza software was written in 1965 by Joseph Weizenbaum, a professor at MIT, and it simulated the responses of a Rogerian psychiatrist talking to a patient. The program made a superficial analysis of the text typed to it, and spat back one of a large number of canned responses built into it. The illusion that the computer understood any of the conversation fooled quite a number of com-puter-naive people.</p>

<p>Weizenbaum got the first indication of this phenomenon when he invited his secretary to try the system. After a couple of minutes typing with Eliza, the secretary (who had watched Weizenbaum work on the software for many previous months, and could be expected to understand better than most that it was just a computer program) asked Weizenbaum to leave the room so that she could continue her dialogue in private!</p>

<p>The Turing test failed on its first outing, as the secretary plainly regarded this elementary software (with no pretensions to artificial intelligence) as human. Rather than the software showing intelligence, the humans showed gullibility. Eliza proved to be a popular program, and was adapted by Bolt Berenek and Newman, a Boston computer consul-tancy. This led to a more severe test when a BBN vice president found himself connected to Eliza instead of the programmer he was expecting.</p>

<p><img class="right" src="http://ptarcode.github.io/images/post/siri_eliza_chat.png" width="400" title="Eliza" ></p>

<h4>Eliza Chat bot &ndash; NLP Addiction  <a href="http://nlp-addiction.com/eliza/" target="_blank">Try online</a></h4>
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[Erlang Basics]]></title>
    <link href="http://ptarcode.github.io/blog/2016/02/07/erlang-basics/"/>
    <updated>2016-02-07T20:07:00-02:00</updated>
    <id>http://ptarcode.github.io/blog/2016/02/07/erlang-basics</id>
    <content type="html"><![CDATA[<!--more-->


<p>Erlang is a programming language used to build massively scalable soft real-time systems with requirements on high availability. Some of its uses are in telecoms, banking, e-commerce, computer telephony and instant messaging. Erlang&rsquo;s runtime system has built-in support for concurrency, distribution and fault tolerance.</p>

<h3>History</h3>

<p>The name &ldquo;Erlang&rdquo;, attributed to Bjarne Däcker, has been presumed by those working on the telephony switches (for whom the language was designed) to be a reference to Danish mathematician and engineer Agner Krarup Erlang or the ubiquitous use of the unit named for him, and (initially at least) simultaneously as a syllabic abbreviation of &ldquo;Ericsson Language&rdquo;.</p>

<h5>1982 &ndash; 1985</h5>

<p>Experiments with programming of telecom using > 20 different languages. Conclusion: The language must be a very high level symbolic language in order to achive productivity gains ! (Leaves us with: Lisp , Prolog , Parlog &hellip;)</p>

<h5>1985 &ndash; 1986</h5>

<p>Experiments with Lisp,Prolog, Parlog etc. Conclusion: The language must contain primitives for concurrency and error recovery, and the execution model must not have back-tracking. (Rules out Lisp and Prolog.) It must also have a granularity of concurrency such that one asyncronous telephony process is represented by one process in the language. Rules out Parlog. We must therefore develop our own language with the desirable features of Lisp, Prolog and Parlog, but with concurrency and error recovery built into the language.</p>

<h5>1987</h5>

<p>The first experiments with Erlang.</p>

<h5>1988</h5>

<p>ACS/Dunder Phase 1. Prototype construction of PABX functionality by external users Erlang escapes from the lab!</p>

<h5>1989</h5>

<p>ACS/Dunder Phase 2. Reconstruction of 1/10 of the complete MD-110 system. Results: >> 10 times greater gains in efficency at construction compared with construction in PLEX!Further experiments with a fast implementation of Erlang.</p>

<h5>1990</h5>

<p>Erlang is presented at ISS&#8217;90, which results in several new users, e.g Bellcore.</p>

<h5>1991</h5>

<p>Fast implementation of Erlang is released to users. Erlang is represented at Telecom&#8217;91 . More functionality such as ASN1 &ndash; Compiler , graphical interface etc.</p>

<h5>1992</h5>

<p>A lot of new users, e.g several RACE projects. Erlang is ported to VxWorks, PC, Macintosh etc. Three applications using Erlang are presented at ISS&#8217;92. The two first product projects using Erlang are started.</p>

<h5>1993</h5>

<p>Distribution is added to Erlang, which makes it possible to run a homgeneous Erlang system on a heterogeneous hardware. Decision to sell implementations Erlang externally. Separate organization in Ericsson started to maintain and support Erlang implementations and Erlang Tools.</p>

<h3>Installation</h3>

<p>Erlang Solutions offers a number of installs at <a href="http://www.erlang.org/downloads.">http://www.erlang.org/downloads.</a>
Erlang/OTP Platform is a complex system composed of many smaller applications (modules). Installing the erlang package automatically installs the entire OTP suite. Since some of the more advanced users might want to download only a specific selection of modules, Erlang/OTP has been divided into smaller packages, all with the prefix &lsquo;erlang-&rsquo;, that can be installed without launching the erlang package.</p>

<p>Most OS package managers provide pre-built binary packages. You can also download the latest stable releases from Erlang Solutions or try install with package managers.</p>

<pre><code>For Homebrew on OS X: brew install erlang
For MacPorts on OS X: port install erlang
For Ubuntu and Debian: apt-get install erlang
For Fedora: yum install erlang
For FreeBSD: pkg install erlang
</code></pre>

<h3>Shell</h3>

<p>On Windows command line type <strong>werl</strong> on Linux or Mac OS X type <strong>erl</strong>.</p>

<pre><code>Erlang/OTP 18 [erts-7.2] [source-e6dd627] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]

Eshell V7.2  (abort with ^G)
1&gt;
</code></pre>

<h4>Browsing the archives</h4>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>pwd(). 
</span><span class='line'>/Users/ptarcode 
</span><span class='line'>ok</span></code></pre></td></tr></table></div></figure>


<p>Argument in parentheses but in quotes, preferably double quotes.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>5> cd("..").
</span><span class='line'>/Users
</span><span class='line'>ok
</span><span class='line'>6> cd("ptarcode"). /Users/ptarcode
</span><span class='line'>ok
</span><span class='line'>7></span></code></pre></td></tr></table></div></figure>


<h4>Doing &hellip;</h4>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>Eshell V5.9 (abort with ^G) 1> 2+2.
</span><span class='line'>4
</span><span class='line'>2> 39-9.
</span><span class='line'>30
</span><span class='line'>3> 10*43.
</span><span class='line'>430
</span><span class='line'>4> 100 div 15.
</span><span class='line'>6
</span><span class='line'>6> 100 rem 15.
</span><span class='line'>10
</span><span class='line'>7> 3*(5+3).
</span><span class='line'>24</span></code></pre></td></tr></table></div></figure>


<h4>Functions &hellip;</h4>

<p>Mathematical functions supported by Erlang’s math module simple examples.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>4> math:pi(). 
</span><span class='line'>3.141592653589793
</span><span class='line'>
</span><span class='line'>5> math:cos(math:pi()).
</span><span class='line'>-1.0</span></code></pre></td></tr></table></div></figure>


<h4>Numbers</h4>

<p>Erlang recognizes integers and floating-point numbers. Uses the 64-bit IEEE 754-1985 “double precision” representation. This means that it keeps track of about 15 decimal digits plus an exponent.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>7> 8888888888888888888888888888888888888888888.0. 
</span><span class='line'>8.888888888888889e42
</span><span class='line'>
</span><span class='line'>9> 88888888888.88888888888888 .
</span><span class='line'>88888888888.88889</span></code></pre></td></tr></table></div></figure>


<p>Digits+Exponent notation</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>7> 2.923e127. 2.923e127
</span><span class='line'>8> 7.6345435e-231. 7.6345435e-231</span></code></pre></td></tr></table></div></figure>


<p>Base2+Value notation</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>11> 2#10101. 
</span><span class='line'>21
</span><span class='line'>12> -2#10101. 
</span><span class='line'>-21</span></code></pre></td></tr></table></div></figure>


<p>Base16+Value notation</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>16> 16#fa81.
</span><span class='line'>64129
</span><span class='line'>17> -16#fa81.
</span><span class='line'>-64129</span></code></pre></td></tr></table></div></figure>


<h4>Variables</h4>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>19> V=3 .
</span><span class='line'>3</span></code></pre></td></tr></table></div></figure>


<p>Variable can&rsquo;t be signed with a new value.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>20> V=4 .
</span><span class='line'>** exception error: no match of right hand side value 4
</span><span class='line'>21> 
</span><span class='line'>
</span><span class='line'>21> V2= V*4 .
</span><span class='line'>12
</span><span class='line'>22> V2 .
</span><span class='line'>12</span></code></pre></td></tr></table></div></figure>


<p>Show bounded variables <strong>b() . </strong></p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>23> b() .
</span><span class='line'>V = 3
</span><span class='line'>V2 = 12
</span><span class='line'>ok</span></code></pre></td></tr></table></div></figure>


<p>Clearing bounded variables <strong>f(variable) . </strong></p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>23> b() .
</span><span class='line'>V = 3
</span><span class='line'>V2 = 12
</span><span class='line'>ok
</span><span class='line'>24> f(V) .
</span><span class='line'>ok
</span><span class='line'>25> b() . 
</span><span class='line'>V2 = 12
</span><span class='line'>ok</span></code></pre></td></tr></table></div></figure>


<p>Clearing all bounded variables <strong>f() . </strong></p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>23> b() .
</span><span class='line'>V = 3
</span><span class='line'>V2 = 12
</span><span class='line'>ok
</span><span class='line'>24> f() .
</span><span class='line'>ok
</span><span class='line'>25> b() .
</span><span class='line'>ok</span></code></pre></td></tr></table></div></figure>


<p>Continue &hellip;</p>
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[Latex to Html]]></title>
    <link href="http://ptarcode.github.io/blog/2015/04/26/latex-to-html/"/>
    <updated>2015-04-26T18:51:00-03:00</updated>
    <id>http://ptarcode.github.io/blog/2015/04/26/latex-to-html</id>
    <content type="html"><![CDATA[<!--more-->


<h3>MathJax</h3>

<p>Perfect to render equations but don&rsquo;t have structures support like tables and lists.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>&lt;html>
</span><span class='line'>&lt;head>
</span><span class='line'>&lt;title>MathJax TeX Test Page&lt;/title>
</span><span class='line'>&lt;script type="text/x-mathjax-config">
</span><span class='line'>  MathJax.Hub.Config({tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]}});
</span><span class='line'>&lt;/script>
</span><span class='line'>&lt;script type="text/javascript"
</span><span class='line'>  src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
</span><span class='line'>&lt;/script>
</span><span class='line'>&lt;/head></span></code></pre></td></tr></table></div></figure>




<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>&lt;body>
</span><span class='line'>When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are
</span><span class='line'>$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$
</span><span class='line'>&lt;/body></span></code></pre></td></tr></table></div></figure>


<h5>Saiba mais em <a href="http://www.mathjax.org/.">http://www.mathjax.org/.</a></h5>

<h3>Latex2html5</h3>

<p>This project is the frontend only version of the code that originated from Mathapedia to enable real-time, dynamic authorship of mathematical ebooks</p>

<script type="text/x-mathjax-config">
    // &lt;![CDATA[
    MathJax.Hub.Config({ 
        TeX: {extensions: ["AMSmath.js", "AMSsymbols.js"]},     
        extensions: ["tex2jax.js"],
        jax: ["input/TeX", "output/HTML-CSS"],
        showProcessingMessages : false,
        messageStyle : "none" ,    
        showMathMenu: false ,
        tex2jax: {
            processEnvironments: true,
            inlineMath: [ ['$','$'], ["\(","\)"] ],
            displayMath: [ ['$$','$$'], ["\[","\]"] ],
            preview : "none",
            processEscapes: true
        },
        "HTML-CSS": { linebreaks: { automatic:true, width: "latex-container"} }
    });
    // ]]&gt;
</script>


<script type="text/javascript" src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML"></script>


<p>LaTeX2HTML5 Installation</p>

<p>Simply download the JS and CSS files and include them on your MathJax enabled website:</p>

<pre><code> &lt;link rel="stylesheet" href="latex2html5.min.css"&gt; 
 &lt;script type="text/javascript" src="latex2html5.min.js"&gt;&lt;/script&gt; 
</code></pre>

<p>If you want the same font as the rendered examples:
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Arbutus+Slab" type="text/css"></p>

<p>You have three options for parsing the LATEX:
You can put LATEX inside of the current page within a script tag with the type set to &ldquo;tex/latex&rdquo;:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>&lt;script type="tex/latex">
</span><span class='line'>                ... LaTeX here ...
</span><span class='line'>            &lt;/script>
</span><span class='line'>            &lt;script type="text/javascript">
</span><span class='line'>                $('body').latex();
</span><span class='line'>            &lt;/script></span></code></pre></td></tr></table></div></figure>


<p>or you can read a .tex file from somewhere else, which is nice for editing .tex files:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>&lt;latex src="path/to/my/latex.tex">
</span><span class='line'>            &lt;script type="text/javascript">
</span><span class='line'>                $('latex').LaTeX();
</span><span class='line'>            &lt;/script></span></code></pre></td></tr></table></div></figure>


<p>or you can write it from scratch!</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>MathJax.Hub.Register.StartupHook("End",function () {
</span><span class='line'>
</span><span class='line'>      $('[type="tex/latex"]').each(function (i, el) {
</span><span class='line'>          var $el = $(el);
</span><span class='line'>          var TEX = new LaTeX2HTML5.TeX({
</span><span class='line'>              tagName: 'section',
</span><span class='line'>              className: 'latex-container',
</span><span class='line'>              latex: $el.text()
</span><span class='line'>          });
</span><span class='line'>          TEX.render();
</span><span class='line'>          $el.replaceWith(TEX.$el);
</span><span class='line'>      });
</span><span class='line'>      
</span><span class='line'>  });</span></code></pre></td></tr></table></div></figure>


<p>Examples:</p>

<h5>pstricks    <a href="http://latex2html5.com/examples/pstricks.html">http://latex2html5.com/examples/pstricks.html</a></h5>

<h5>interactive <a href="http://latex2html5.com/examples/interactive.html">http://latex2html5.com/examples/interactive.html</a></h5>

<h5>graphs      <a href="http://latex2html5.com/examples/graphs.html">http://latex2html5.com/examples/graphs.html</a></h5>
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[First peripheral only with radio static.]]></title>
    <link href="http://ptarcode.github.io/blog/2015/04/26/first-peripheral-only-with-radio-static/"/>
    <updated>2015-04-26T00:08:00-03:00</updated>
    <id>http://ptarcode.github.io/blog/2015/04/26/first-peripheral-only-with-radio-static</id>
    <content type="html"><![CDATA[<hr />

<!--more-->


<p>In March 1975, thirty-two computer enthusiasts met in Gordon French’s garage around an Altair 8800 computer. No one had seen anything like it, and they shared whatever information they had. Steve Dompier had actually been to MITS in Albuquerque to pick up an Altair, and he described an overworked staff trying to catch up with a flood of orders. They had already shipped 1500 machines and were working hard to get the next 1100 out the door. What’s more, the company would deliver none of the much-needed accessories until they filled the outstanding orders for the basic machine. This news was about all Dompier had to show for his trip: he ended up leaving Albuquerque without significant chunks of the Altair kit he had bought and paid for.</p>

<p>The Altair actually on display at the meeting had been sent to the editorial department of Bob Albrecht’s People’s Computer Company for review, and he showed it off to the club. It was a marvel, the first small, affordable computer that could actually do something, and there it was in Gordon French’s garage, blinking, maybe even computing—though the only real evidence of that was the blinking, since the machine had no screen or keyboard.</p>

<p>The group agreed to continue meeting and called themselves the Homebrew Computer Club. Over the next weeks they dissected the Altair. Everything about it, good and bad, inspired and excited them, and they would go away into the night planning their own projects—memory boards for the Altair, peripherals, a better bus, even competing computers.</p>

<p>Steve Dompier finally got the remainder of his kit, and he put it together in two sleepless days. Testing it he discovered that its unshielded circuits interfered with a nearby radio, turning everything into static. Interestingly, though, the static changed pitch as the Altair went through its test programs. Dompier stayed up another eight hours working out the musical scale and writing a demo program for Homebrew.</p>

<p>At the next meeting he toggled in the program (twice because someone tripped over the plug the first time) and tuned his radio between stations to get uninterrupted fuzz. At the final flick of a switch, the Altair began playing a wispy version of The Beatles’ “Fool on the Hill” in pure radio static. It was possibly the first program beyond test routines ever written for the Altair. As an encore, the machine then went into a short rendition of “Daisy Bell,” an homage to a pioneering piece of computer music performed at Bell Labs back in the ’50s.</p>

<p>The significance of “Daisy” was obvious, and the room went wild. The Homebrew Computer Club was staking its claim to a world that once belonged only to university labs, corporations, and government agencies. After that night, the power of computing would be open to all.</p>

<hr />

<hr />

<p>Altair plays &ldquo;The Fool on the Hill&rdquo;</p>

<p><video width='640' height='340' preload='none' controls poster='http://ptarcode.github.io/images/cover-movie.png'><source src='http://ptarcode.github.io/images/movie-audio/Altair_Fool_On_the_Hill_music.mp3' ></video></p>

<hr />

<hr />

<p>Homebrew Computer Club</p>

<p><video width='640' height='340' preload='none' controls poster='http://ptarcode.github.io/images/cover-movie.png'><source src='http://ptarcode.github.io/images/movie-audio/homebrew.mp4' type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'></video></p>

<hr />
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[Rails 4 Turbolinks]]></title>
    <link href="http://ptarcode.github.io/blog/2013/11/26/rails-4-turbolinks/"/>
    <updated>2013-11-26T23:36:00-02:00</updated>
    <id>http://ptarcode.github.io/blog/2013/11/26/rails-4-turbolinks</id>
    <content type="html"><![CDATA[<hr />

<!--more-->


<h3>What is it?</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>gem 'turbolinks'</span></code></pre></td></tr></table></div></figure>


<p>&ldquo;This is a gem that works similar to pjax, but instead of worrying about what element on the page to replace, and tailoring the server-side response to fit, we replace the entire body. This means that you get the bulk of the speed benefits from pjax (no recompiling of the JavaScript or CSS) without having to tailor the server-side response. It just works.&rdquo;</p>

<h3>PJAX</h3>

<p>Uses AJAX and PushState to deliver a faster browsing experience by only loading and updating parts of the page HTML each page load. PushState makes it possible to add real permalinks, page titles, and a working back button so that your visitors won&rsquo;t be able to tell the difference between PJAX page load and ordinary full page loads.</p>

<p><a href="http://www.youtube.com/watch?v=CKv9C2qUL-8" title="Title">Tutorial</a></p>

<h3>Using the gem</h3>

<p>Gemfile:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>gem 'turbolinks'</span></code></pre></td></tr></table></div></figure>


<p>Add this line on app/assets/javascripts/application.js:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>//= require turbolinks</span></code></pre></td></tr></table></div></figure>


<p>app/views/layouts/application.html.erb:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>&lt;%= stylesheet_link_tag    "application", media: "all", "data-turbolinks-track" => true %>
</span><span class='line'>&lt;%= javascript_include_tag "application", "data-turbolinks-track" => true %></span></code></pre></td></tr></table></div></figure>


<p>If you wont use Turbolink in some link, you can manually exclude:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>&lt;a href="http://ptarcode.github.io/examples" data-no-turbolink>Examples&lt;/a></span></code></pre></td></tr></table></div></figure>


<p>&ldquo;With Turbolinks pages will change without a full reload, so you can&rsquo;t rely on DOMContentLoaded or jQuery.ready() to trigger your code. Instead Turbolinks fires events on document to provide hooks into the lifecycle of the page.&rdquo;
Runtime Dependencies coffee-rails, but if you want use javascript.You can manually download and compile the turbolinks.js.coffee to JavaScript.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>ready = ->
</span><span class='line'>
</span><span class='line'>  ...your coffeescript goes here...
</span><span class='line'>
</span><span class='line'>$(document).ready(ready)
</span><span class='line'>$(document).on('page:load', ready)</span></code></pre></td></tr></table></div></figure>




<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>var ready;
</span><span class='line'>ready = function() {
</span><span class='line'>
</span><span class='line'>  ...your javascript goes here...
</span><span class='line'>
</span><span class='line'>};
</span><span class='line'>
</span><span class='line'>$(document).ready(ready);
</span><span class='line'>$(document).on('page:load', ready);</span></code></pre></td></tr></table></div></figure>


<h3>Links</h3>

<p><a href="https://github.com/rails/turbolinks" title="Turbolinks Project">Turbolinks Project</a></p>

<p><a href="http://railscasts.com/episodes/390-turbolinks" title="Railscasts Turbolinks">Railscasts Turbolinks</a></p>

<hr />
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[Clima tempo module for Node.js]]></title>
    <link href="http://ptarcode.github.io/blog/2013/09/09/clima-tempo-module-for-node-dot-js/"/>
    <updated>2013-09-09T11:33:00-03:00</updated>
    <id>http://ptarcode.github.io/blog/2013/09/09/clima-tempo-module-for-node-dot-js</id>
    <content type="html"><![CDATA[<hr />

<!--more-->


<h3>version : 0.0.9</h3>

<p>Communication with Clima Tempo accessing information about the weather of Brazil.</p>

<h2>Installation</h2>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>npm install clima-tempo</span></code></pre></td></tr></table></div></figure>


<h2>Usage</h2>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>var clima = require(clima-tempo);
</span><span class='line'>           
</span><span class='line'>      var callback = function(error, result) {
</span><span class='line'>          if (error) {
</span><span class='line'>              console.error(error);
</span><span class='line'>          }
</span><span class='line'>          else{
</span><span class='line'>              ......
</span><span class='line'>          }
</span><span class='line'>      }</span></code></pre></td></tr></table></div></figure>


<h3>.days</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>//type = Default or  Extended
</span><span class='line'>      clima.days(codCity,"Extended",callback);</span></code></pre></td></tr></table></div></figure>


<h4>return</h4>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
<span class='line-number'>23</span>
<span class='line-number'>24</span>
<span class='line-number'>25</span>
<span class='line-number'>26</span>
<span class='line-number'>27</span>
<span class='line-number'>28</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>[ { dia: '2013-09-09',
</span><span class='line'>          tempo: 'Parcialmente Nublado',
</span><span class='line'>          maxima: '30',
</span><span class='line'>          minima: '17' },
</span><span class='line'>        { dia: '2013-09-10',
</span><span class='line'>          tempo: undefined,
</span><span class='line'>          maxima: '29',
</span><span class='line'>          minima: '18' },
</span><span class='line'>        { dia: '2013-09-11',
</span><span class='line'>          tempo: 'Parcialmente Nublado',
</span><span class='line'>          maxima: '29',
</span><span class='line'>          minima: '18' },
</span><span class='line'>        { dia: '2013-09-12',
</span><span class='line'>          tempo: 'Parcialmente Nublado',
</span><span class='line'>          maxima: '29',
</span><span class='line'>          minima: '18' },
</span><span class='line'>        { dia: '2013-09-13',
</span><span class='line'>          tempo: 'Parcialmente Nublado',
</span><span class='line'>          maxima: '29',
</span><span class='line'>          minima: '17' },
</span><span class='line'>        { dia: '2013-09-14',
</span><span class='line'>          tempo: 'Parcialmente Nublado',
</span><span class='line'>          maxima: '29',
</span><span class='line'>          minima: '17' },
</span><span class='line'>        { dia: '2013-09-15',
</span><span class='line'>          tempo: 'Parcialmente Nublado',
</span><span class='line'>          maxima: '29',
</span><span class='line'>          minima: '17' } ]</span></code></pre></td></tr></table></div></figure>


<h3>.nowFromPage</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>clima.nowFromPage('3156',callback);</span></code></pre></td></tr></table></div></figure>


<h4>return</h4>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>{ last_update: 'Atualizado às: 18:00 ',
</span><span class='line'>          wind: { velocity: '22 Km/h', direction: 'Nor-nordeste' },
</span><span class='line'>          moisture: '83%',
</span><span class='line'>          condition: 'Alguma nebulosidade',
</span><span class='line'>          pression: '1011 hPa',
</span><span class='line'>          temperature: '23ºC' }</span></code></pre></td></tr></table></div></figure>


<h3>.fullFromPage</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>clima.fullFromPage('3156',callback);</span></code></pre></td></tr></table></div></figure>


<h4>return</h4>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
<span class='line-number'>23</span>
<span class='line-number'>24</span>
<span class='line-number'>25</span>
<span class='line-number'>26</span>
<span class='line-number'>27</span>
<span class='line-number'>28</span>
<span class='line-number'>29</span>
<span class='line-number'>30</span>
<span class='line-number'>31</span>
<span class='line-number'>32</span>
<span class='line-number'>33</span>
<span class='line-number'>34</span>
<span class='line-number'>35</span>
<span class='line-number'>36</span>
<span class='line-number'>37</span>
<span class='line-number'>38</span>
<span class='line-number'>39</span>
<span class='line-number'>40</span>
<span class='line-number'>41</span>
<span class='line-number'>42</span>
<span class='line-number'>43</span>
<span class='line-number'>44</span>
<span class='line-number'>45</span>
<span class='line-number'>46</span>
<span class='line-number'>47</span>
<span class='line-number'>48</span>
<span class='line-number'>49</span>
<span class='line-number'>50</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>[ { last_update: 'Previsão do tempo atualizada às: 19:40 ',
</span><span class='line'>          date: ' Quarta-Feira, 04/09 ',
</span><span class='line'>          condition: 'Chuvoso durante o dia e a noite',
</span><span class='line'>          wind: 'NNE8km/h',
</span><span class='line'>          probability_of_precipitation: '26mm90%',
</span><span class='line'>          moisture_relative_complete: { max: '90%', min: '50%' },
</span><span class='line'>          temperature: { max: '27º', min: ' 21º ' },
</span><span class='line'>          uv: 'Alto',
</span><span class='line'>          sunrise: '06h43',
</span><span class='line'>          sunset: '18h26' },
</span><span class='line'>        { last_update: 'Previsão do tempo atualizada às: 19:40 ',
</span><span class='line'>          date: ' Quinta-Feira, 05/09 ',
</span><span class='line'>          condition: 'Sol com algumas nuvens. Não chove.',
</span><span class='line'>          wind: 'S9km/h',
</span><span class='line'>          probability_of_precipitation: '0mm0%',
</span><span class='line'>          moisture_relative_complete: { max: '93%', min: '52%' },
</span><span class='line'>          temperature: { max: '28º', min: ' 17º ' },
</span><span class='line'>          uv: 'Extremo',
</span><span class='line'>          sunrise: '06h42',
</span><span class='line'>          sunset: '18h26' },
</span><span class='line'>        { last_update: 'Previsão do tempo atualizada às: 19:40 ',
</span><span class='line'>          date: ' Sexta-Feira, 06/09 ',
</span><span class='line'>          condition: 'Sol com algumas nuvens. Não chove.',
</span><span class='line'>          wind: 'ESE12km/h',
</span><span class='line'>          probability_of_precipitation: '0mm0%',
</span><span class='line'>          moisture_relative_complete: { max: '91%', min: '50%' },
</span><span class='line'>          temperature: { max: '30º', min: ' 16º ' },
</span><span class='line'>          uv: 'Extremo',
</span><span class='line'>          sunrise: '06h41',
</span><span class='line'>          sunset: '18h27' },
</span><span class='line'>        { last_update: 'Previsão do tempo atualizada às: 19:40 ',
</span><span class='line'>          date: ' Sábado, 07/09 ',
</span><span class='line'>          condition: 'Sol com algumas nuvens. Não chove.',
</span><span class='line'>          wind: 'ESE11km/h',
</span><span class='line'>          probability_of_precipitation: '0mm0%',
</span><span class='line'>          moisture_relative_complete: { max: '91%', min: '51%' },
</span><span class='line'>          temperature: { max: '29º', min: ' 20º ' },
</span><span class='line'>          uv: 'Extremo',
</span><span class='line'>          sunrise: '06h40',
</span><span class='line'>          sunset: '18h27' },
</span><span class='line'>        { last_update: 'Previsão do tempo atualizada às: 19:40 ',
</span><span class='line'>          date: 'Domingo, 08/09',
</span><span class='line'>          condition: 'Sol e aumento de nuvens de manhã. Pancadas de chuva à tarde e à noite.',
</span><span class='line'>          wind: 'E11km/h',
</span><span class='line'>          probability_of_precipitation: '5mm80%',
</span><span class='line'>          moisture_relative_complete: { max: '90%', min: '49%' },
</span><span class='line'>          temperature: { max: '32º', min: ' 18º ' },
</span><span class='line'>          uv: 'Muito Alto',
</span><span class='line'>          sunrise: '06h39',
</span><span class='line'>          sunset: '18h27' } ]</span></code></pre></td></tr></table></div></figure>


<h3>.trendsFromPage</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>clima.trendsFromPage('3156',callback);
</span><span class='line'>
</span><span class='line'>      [ { date: 'Domingo, 08/09',
</span><span class='line'>          condition: 'Sol e aumento de nuvens de manhã. Pancadas de chuva à tarde e à noite.',
</span><span class='line'>          probability_of_precipitation: '23mm80%',
</span><span class='line'>          temperature: { max: '33º', min: '33º' } },
</span><span class='line'>        { date: 'Segunda-Feira, 09/09',
</span><span class='line'>          condition: 'Sol e aumento de nuvens de manhã. Pancadas de chuva à tarde e à noite.',
</span><span class='line'>          probability_of_precipitation: '2mm80%',
</span><span class='line'>          temperature: { max: '34º', min: '34º' } },
</span><span class='line'>        { date: 'Terça-Feira, 10/09',
</span><span class='line'>          condition: 'Sol com algumas nuvens. Não chove.',
</span><span class='line'>          probability_of_precipitation: '0mm0%',
</span><span class='line'>          temperature: { max: '34º', min: '34º' } },
</span><span class='line'>        { date: 'Quarta-Feira, 11/09',
</span><span class='line'>          condition: 'Sol com algumas nuvens. Não chove.',
</span><span class='line'>          probability_of_precipitation: '0mm0%',
</span><span class='line'>          temperature: { max: '36º', min: '36º' } },
</span><span class='line'>        { date: 'Quinta-Feira, 12/09',
</span><span class='line'>          condition: 'Sol com aumento de nuvens ao longo do dia. À noite ocorrem pancadas de chuva.',
</span><span class='line'>          probability_of_precipitation: '3mm80%',
</span><span class='line'>          temperature: { max: '37º', min: '37º' } } ]</span></code></pre></td></tr></table></div></figure>


<h2>Dependencies</h2>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>cherrio       : ">=0.12.1",
</span><span class='line'>    libxml-to-js  : ">=0.3.11",
</span><span class='line'>    xmlhttprequest: ">=1.6.0"</span></code></pre></td></tr></table></div></figure>


<hr />
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[Writing and Publishing Node.js Modules]]></title>
    <link href="http://ptarcode.github.io/blog/2013/09/03/writing-and-publishing-node-dot-js-modules/"/>
    <updated>2013-09-03T08:02:00-03:00</updated>
    <id>http://ptarcode.github.io/blog/2013/09/03/writing-and-publishing-node-dot-js-modules</id>
    <content type="html"><![CDATA[<hr />

<!--more-->


<h2>Write</h2>

<p>If you have a library and you want to share with the other programs, it&rsquo;s time to create a module. It&rsquo;s very simple but you have to known some rules.</p>

<h3>Structure</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>-example-module
</span><span class='line'>  -lib
</span><span class='line'>      example-modules.js
</span><span class='line'>  -node-modules
</span><span class='line'>      -example-dependencies
</span><span class='line'>  -tests
</span><span class='line'>      test-something.js
</span><span class='line'>  LICENSE
</span><span class='line'>  package.json
</span><span class='line'>  README.md</span></code></pre></td></tr></table></div></figure>


<h4>lib</h4>

<p>This folder contains all the files responsible for the functionality of your module.</p>

<h4>node-modules</h4>

<p>This folder contains all the dependencies(other modules) used to implementation. This is created automatically when you install some modude.</p>

<h4>tests</h4>

<p>Contains all tests arquives to test your module.</p>

<h4>LICENSE</h4>

<p>This file contains all informations about the license of module.</p>

<h4>package.json</h4>

<p>This is the most important file, allows to see all information about this module, structure, owner e etc.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
<span class='line-number'>23</span>
<span class='line-number'>24</span>
<span class='line-number'>25</span>
<span class='line-number'>26</span>
<span class='line-number'>27</span>
<span class='line-number'>28</span>
<span class='line-number'>29</span>
<span class='line-number'>30</span>
<span class='line-number'>31</span>
<span class='line-number'>32</span>
<span class='line-number'>33</span>
<span class='line-number'>34</span>
<span class='line-number'>35</span>
<span class='line-number'>36</span>
<span class='line-number'>37</span>
<span class='line-number'>38</span>
<span class='line-number'>39</span>
<span class='line-number'>40</span>
<span class='line-number'>41</span>
<span class='line-number'>42</span>
<span class='line-number'>43</span>
<span class='line-number'>44</span>
<span class='line-number'>45</span>
<span class='line-number'>46</span>
<span class='line-number'>47</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>{
</span><span class='line'>  "name": "example-module",
</span><span class='line'>  "description": "This simple example how create a module",
</span><span class='line'>  "version": "0.0.1",
</span><span class='line'>  "author": {
</span><span class='line'>    "name": "Example Module",
</span><span class='line'>    "email": "ezample@module.com"
</span><span class='line'>  },
</span><span class='line'>  "keywords": [
</span><span class='line'>    "example",
</span><span class='line'>    "module",
</span><span class='line'>    "how to"
</span><span class='line'>  ],
</span><span class='line'>  "contributors": [
</span><span class='line'>    {
</span><span class='line'>      "name": "Friend1",
</span><span class='line'>      "email": "friend1@node.net"
</span><span class='line'>    }
</span><span class='line'>  ],
</span><span class='line'>  "repository": {
</span><span class='line'>    "type": "git",
</span><span class='line'>    "url": "git://github.com/example-module/example-module.git"
</span><span class='line'>  },
</span><span class='line'>  "bugs": {
</span><span class='line'>    "mail": "bugs@node.com",
</span><span class='line'>    "url": "http://github.com/fb55/example-module/issues"
</span><span class='line'>  },
</span><span class='line'>  "directories": {
</span><span class='line'>    "lib": "lib/"
</span><span class='line'>  },
</span><span class='line'>  "main": "lib/index.js",
</span><span class='line'>  "scripts": {
</span><span class='line'>    "test": "tests/test-something.js"
</span><span class='line'>  },
</span><span class='line'>  "dependencies": {
</span><span class='line'>    "example-dependencies": "2.0"
</span><span class='line'>  },
</span><span class='line'>  "licenses": [
</span><span class='line'>    {
</span><span class='line'>      "type": "MIT",
</span><span class='line'>      "url": "http://github.com/example-module/example-module/raw/master/LICENSE"
</span><span class='line'>    }
</span><span class='line'>  ],
</span><span class='line'>  "readme": "Here you can put your readme in one string"
</span><span class='line'>  "_id": "example-module@0.0.1",
</span><span class='line'>  "_from": "example-module@0.0.1"
</span><span class='line'>}</span></code></pre></td></tr></table></div></figure>


<h4>README.md</h4>

<p>This is a markdown file, contains all information how to use de module, version and example the code.</p>

<h2>Publish</h2>

<h3>NPM REGISTRY</h3>

<p>First you have to go to <a href="https://npmjs.org/signup">https://npmjs.org/signup</a> and create account and user.</p>

<h3>npm adduser</h3>

<p>Now you need add user to publish your module.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>npm adduser
</span><span class='line'> 
</span><span class='line'>Username: example
</span><span class='line'>Password: 
</span><span class='line'>Email: example@node.com</span></code></pre></td></tr></table></div></figure>


<h3>npm publish</h3>

<p>Now you have to go to root of your module and use this command.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>npm publish</span></code></pre></td></tr></table></div></figure>


<p>Now your module was published and you can download from npm and install in other project.</p>
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[Blocks, Procs e Lambdas]]></title>
    <link href="http://ptarcode.github.io/blog/2013/08/21/blocks-procs-e-lambdas/"/>
    <updated>2013-08-21T22:35:00-03:00</updated>
    <id>http://ptarcode.github.io/blog/2013/08/21/blocks-procs-e-lambdas</id>
    <content type="html"><![CDATA[<hr />

<!--more-->


<h2>Blocks</h2>

<p>Writing methods that can accept blocks is simple. There&rsquo;s no special syntax needed, you can simply write the method as you would any other. To call any block passed to the method, use the yield keyword. Like any other method call, when you use the yield keyword you can leave it as it is and call the block without any parameters. Or, if you wish, you can add a parameter list as you would with a method call.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>def call_this_block
</span><span class='line'>  yield
</span><span class='line'>end
</span><span class='line'>
</span><span class='line'>call_this_block { puts "tweet" }</span></code></pre></td></tr></table></div></figure>


<h4>Optional Block</h4>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>class Optional
</span><span class='line'>  def initialize
</span><span class='line'>     yield self if block_given?
</span><span class='line'>  end
</span><span class='line'>end</span></code></pre></td></tr></table></div></figure>


<h2>Procs</h2>

<p>Proc objects are blocks of code that have been bound to a set of local variables. Once bound, the code may be called in different contexts and still access those variables.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>def gen_times(factor)
</span><span class='line'>  return Proc.new {|n| n*factor }
</span><span class='line'>end
</span><span class='line'>
</span><span class='line'>times3 = gen_times(3)
</span><span class='line'>times5 = gen_times(5)
</span><span class='line'>
</span><span class='line'>times3.call(12)               #=> 36
</span><span class='line'>times5.call(5)                #=> 25
</span><span class='line'>times3.call(times5.call(4))   #=> 60</span></code></pre></td></tr></table></div></figure>


<h2>Lambdas</h2>

<p>You may have heard of lambdas before. Perhaps you&rsquo;ve used them in other languages. Despite the fancy name, a lambda is just a function&hellip; peculiarly&hellip; without a name. They&rsquo;re anonymous, little functional spies sneaking into the rest of your code. Lambdas in Ruby are also objects, just like everything else! The last expression of a lambda is its return value, just like regular functions. As boring and familiar as that all sounds, it gives us a lot of power.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>my_proc = lambda { puts "tweet" }
</span><span class='line'>my_proc.call # => tweet</span></code></pre></td></tr></table></div></figure>


<h4>Multiple Lambdas</h4>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>class Comment
</span><span class='line'>  def post(
</span><span class='line'>      if authenticate?(@user, @password)
</span><span class='line'>          # submit the comment
</span><span class='line'>          success
</span><span class='line'>          success.call
</span><span class='line'>      else
</span><span class='line'>          error.call
</span><span class='line'>      end
</span><span class='line'>  end
</span><span class='line'>end
</span><span class='line'>
</span><span class='line'>
</span><span class='line'>comment   = Comment.new('Yeeeeeep!')
</span><span class='line'>success = -> { puts "Sent!" }
</span><span class='line'>error   = -> { raise 'Auth Error' }
</span><span class='line'>comment.post(success, error)</span></code></pre></td></tr></table></div></figure>


<h4>Lambda to Block</h4>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>blablas = ["First", "Second"]
</span><span class='line'>blablas.each do |blabla|
</span><span class='line'>puts blabla                   #Lets try converting to a proc
</span><span class='line'>end
</span><span class='line'>
</span><span class='line'>blablas = ["First", "Second"]
</span><span class='line'>printer = lambda { |blabla| puts blabla }
</span><span class='line'>
</span><span class='line'>blablas.each(&printer)       
</span><span class='line'>
</span><span class='line'>#‘&’ turns proc into block 
</span><span class='line'>#because each expects a block, not a proc</span></code></pre></td></tr></table></div></figure>


<hr />
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[Gem agendare-schedule]]></title>
    <link href="http://ptarcode.github.io/blog/2013/08/17/gem-agendare-schedule/"/>
    <updated>2013-08-17T12:22:00-03:00</updated>
    <id>http://ptarcode.github.io/blog/2013/08/17/gem-agendare-schedule</id>
    <content type="html"><![CDATA[<hr />

<!--more-->


<p><a href="http://badge.fury.io/rb/agendare-schedule"><img src="https://badge.fury.io/rb/agendare-schedule.png" alt="Gem Version" /></a></p>

<p>The basic structure to implement schedule project. You have 3 objects to implement yours views, because the logic is implemented in this gem.</p>

<h2>Installation</h2>

<p>Add this line to your application&rsquo;s Gemfile:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>gem 'agendare-schedule'</span></code></pre></td></tr></table></div></figure>


<p>And then execute:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ bundle</span></code></pre></td></tr></table></div></figure>


<h2>Usage</h2>

<p>Create controlllers.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>rails  generate agendare:install controllers</span></code></pre></td></tr></table></div></figure>


<p>Create models.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>rails  generate agendare:install models</span></code></pre></td></tr></table></div></figure>


<p>Create migrations.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>rails  generate agendare:install migrations</span></code></pre></td></tr></table></div></figure>


<p>Import the structure to database.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>rake db:migrate</span></code></pre></td></tr></table></div></figure>


<p>Add this lines in your config/routes.rb</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>resources :schedules
</span><span class='line'>   resources :scheduleds
</span><span class='line'>   resources :users</span></code></pre></td></tr></table></div></figure>


<hr />
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[Gem previsao-clima-tempo]]></title>
    <link href="http://ptarcode.github.io/blog/2013/08/17/gem-previsao-clima-tempo/"/>
    <updated>2013-08-17T00:00:00-03:00</updated>
    <id>http://ptarcode.github.io/blog/2013/08/17/gem-previsao-clima-tempo</id>
    <content type="html"><![CDATA[<hr />

<!--more-->


<p><a href="http://badge.fury.io/rb/previsao-clima-tempo"><img src="https://badge.fury.io/rb/previsao-clima-tempo.png" alt="Gem Version" /></a></p>

<p>Communication with Clima Tempo accessing information about the weather of Brazil.</p>

<h2>Installation</h2>

<p>Add this line to your application&rsquo;s Gemfile:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>gem 'previsao-clima-tempo'</span></code></pre></td></tr></table></div></figure>


<p>And then execute:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ bundle</span></code></pre></td></tr></table></div></figure>


<p>Or install it yourself as:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ gem install previsao-clima-tempo</span></code></pre></td></tr></table></div></figure>


<h2>Usage</h2>

<h3>From Webservice</h3>

<h5>.new</h5>

<p>Instantiating a object.The city code should be informed.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>PrevisaoClimaTempo.new(:codCity => '3156')</span></code></pre></td></tr></table></div></figure>


<h5>.now</h5>

<p>Returns an object PrevisaoDia with information from the current day.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>PrevisaoClimaTempo.new(:codCity => '3156').now</span></code></pre></td></tr></table></div></figure>


<h5>.tomorrow</h5>

<p>Returns an object PrevisaoDia with information the next day.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>PrevisaoClimaTempo.new(:codCity => '3156').tomorrow</span></code></pre></td></tr></table></div></figure>


<h5>.days</h5>

<p>Returns a collection of objects PrevisaoDia with information of days referenced.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>PrevisaoClimaTempo.new(:codCity => '3156').days(13) maximum of 13 days from the current day</span></code></pre></td></tr></table></div></figure>


<h5>.day</h5>

<p>Returns an object PrevisaoDia with information the day referenced.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>PrevisaoClimaTempo.new(:codCity => '3156').day(date)</span></code></pre></td></tr></table></div></figure>


<h3>From Page</h3>

<h4>(contains more information than is extracted from the webservice)</h4>

<h5>.nowFromPage</h5>

<p>Returns a hash of condtions of weather from page</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>PrevisaoClimaTempo.new(:codCity => '314').nowFromPage</span></code></pre></td></tr></table></div></figure>


<p>return:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>{
</span><span class='line'>      :last_update: 18:00
</span><span class='line'>      :wind:
</span><span class='line'>        :velocity: 3 Km/h
</span><span class='line'>        :direction: Su-sudeste
</span><span class='line'>      :moisture: 91%
</span><span class='line'>      :condition: Poucas nuvens
</span><span class='line'>      :pression: 1022 hPa
</span><span class='line'>      :temperature: 13ºC  
</span><span class='line'>   }</span></code></pre></td></tr></table></div></figure>


<h5>.fullFromPage</h5>

<p>Returns a hash of condtions of weather whith 5 days from page.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>PrevisaoClimaTempo.new(:codCity => '314').fullFromPage</span></code></pre></td></tr></table></div></figure>


<p>return:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
<span class='line-number'>23</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>{
</span><span class='line'>      1:
</span><span class='line'>        :last_update: 19:00
</span><span class='line'>        :date: Sábado, 17/08/2013
</span><span class='line'>        :condition: Sol com muitas nuvens durante o dia e períodos de céu nublado. Noite
</span><span class='line'>          com muitas nuvens.
</span><span class='line'>        :wind:
</span><span class='line'>          :velocity: 6km/h
</span><span class='line'>          :direction: Su-sudeste
</span><span class='line'>        :probability_of_precipitation:
</span><span class='line'>          :volume: 0mm
</span><span class='line'>          :percentage: 0%
</span><span class='line'>        :moisture_relative_complete:
</span><span class='line'>          :max: 100%
</span><span class='line'>          :min: 49%
</span><span class='line'>        :temperature:
</span><span class='line'>          :max: 16º
</span><span class='line'>          :min: 7º
</span><span class='line'>        :uv: Alto
</span><span class='line'>        :sunrise: 06h13
</span><span class='line'>        :sunset: 17h36
</span><span class='line'>      2: ...
</span><span class='line'>   }</span></code></pre></td></tr></table></div></figure>


<h5>.trendsFromPage</h5>

<p>Returns a hash of condtions of weather whith 5 days from page.
If today is 16-12-2013 returns 21,22,23,24,25 trends.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>PrevisaoClimaTempo.new(:codCity => '314').trendsFromPage</span></code></pre></td></tr></table></div></figure>


<p>return:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>{
</span><span class='line'>      1:
</span><span class='line'>        :date: Quinta-Feira, 22/08/2013
</span><span class='line'>        :condition: Sol com algumas nuvens. Não chove.
</span><span class='line'>        :probability_of_precipitation:
</span><span class='line'>          :volume: 0mm
</span><span class='line'>          :percentage: 0%
</span><span class='line'>        :temperature:
</span><span class='line'>          :max: 23º
</span><span class='line'>          :min: 7º
</span><span class='line'>      2: 
</span><span class='line'>   }</span></code></pre></td></tr></table></div></figure>


<hr />
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[Blog + Octopress + GitHub]]></title>
    <link href="http://ptarcode.github.io/blog/2013/08/11/blog-plus-octopress-plus-github/"/>
    <updated>2013-08-11T18:04:00-03:00</updated>
    <id>http://ptarcode.github.io/blog/2013/08/11/blog-plus-octopress-plus-github</id>
    <content type="html"><![CDATA[<hr />

<!--more-->


<h3>Quick Summary for creating and deploying a post</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ rake new_post["New Post"]
</span><span class='line'>$ rake generate
</span><span class='line'>$ git add .
</span><span class='line'>$ git commit -am "Some comment here." 
</span><span class='line'>$ git push origin source
</span><span class='line'>$ rake deploy</span></code></pre></td></tr></table></div></figure>


<h3>Installation Process</h3>

<p>Go to the terminal and clone the Octopress repo:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>git clone git://github.com/imathis/octopress.git octopress
</span><span class='line'>cd octopress</span></code></pre></td></tr></table></div></figure>


<h3>Check the version of Ruby is 1.9.2. This version is required.</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>ruby --version
</span><span class='line'>bundle install</span></code></pre></td></tr></table></div></figure>


<h3>This command installs Octopress</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>rake install</span></code></pre></td></tr></table></div></figure>


<h3>Deploying to Github</h3>

<p>Create a new Github repository. If you are creating a personal blog create a repo called:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>username.github.com</span></code></pre></td></tr></table></div></figure>


<p>After creating the repo, run the following command.</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$rake setup_github_pages</span></code></pre></td></tr></table></div></figure>


<p>Which is supposed to:</p>

<hr />

<ul>
<li>init a git repo</li>
<li>rename the branch from master to source</li>
<li>add your repo to origin.</li>
</ul>


<hr />

<p>Running the previous command shows this:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>Enter the read/write url for your repository</span></code></pre></td></tr></table></div></figure>


<p>You have to enter it like this:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>git@github.com:username/username.github.com.git</span></code></pre></td></tr></table></div></figure>


<p>For me it didn’t rename the branch from master to source or add my remote repo. I did it manually (see below)</p>

<h3>Add your remote repo</h3>

<p>Check what remote repositories you have:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>git remote -v</span></code></pre></td></tr></table></div></figure>


<p>My output was:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>octopress   git://github.com/imathis/octopress.git (fetch)
</span><span class='line'>octopress   git://github.com/imathis/octopress.git (push)</span></code></pre></td></tr></table></div></figure>


<p>To add your repo do:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>git remote add origin git@github.com:username/username.github.com.git</span></code></pre></td></tr></table></div></figure>


<p>Rename the branch from master to source</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$git branch
</span><span class='line'>* master
</span><span class='line'>$git branch -m master source
</span><span class='line'>$git branch
</span><span class='line'>* source</span></code></pre></td></tr></table></div></figure>


<p>Preview on development stage</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$ rake preview</span></code></pre></td></tr></table></div></figure>


<p>Then browse to:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>localhost:4000</span></code></pre></td></tr></table></div></figure>


<p>If you get this error:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>Sorry, I cannot find /</span></code></pre></td></tr></table></div></figure>


<p>Read this link: Deploying to a Subdirectory</p>

<h3>First push to Github</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$rake generate
</span><span class='line'>$git add .
</span><span class='line'>$git commit -am "First deploy to github." 
</span><span class='line'>$git push origin source
</span><span class='line'>$rake deploy</span></code></pre></td></tr></table></div></figure>


<p>Create a new posting</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$rake new_post["Creating a Github Blog Using Octopress"]</span></code></pre></td></tr></table></div></figure>


<p>Go to the app folder source/_posts to find the new posting
Edit the posting and then follow these steps</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>$rake generate
</span><span class='line'>$git add .
</span><span class='line'>$git commit -m "Initial blog post." 
</span><span class='line'>$git push origin source
</span><span class='line'>$rake deploy</span></code></pre></td></tr></table></div></figure>


<p>Add a custom domain
Go to source folder and create 2 files :
(mate if you are using Textmate)</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>cd source
</span><span class='line'>mate CNAME
</span><span class='line'>mate .nojekyll</span></code></pre></td></tr></table></div></figure>


<p>Open the CNAMe file and this line:</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>www.yourdomain.com</span></code></pre></td></tr></table></div></figure>


<p>The NoJekyll file will make Octopress works in Github Pages.
Push again to github</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>rake generate
</span><span class='line'>git add .
</span><span class='line'>git add -am 'domain configuration'
</span><span class='line'>git push origin source
</span><span class='line'>rake deploy</span></code></pre></td></tr></table></div></figure>


<p>Github need time to read your CNAME and updating the sites.</p>

<hr />
]]></content>
  </entry>
  
  <entry>
    <title type="html"><![CDATA[Rails 3 generators in gem]]></title>
    <link href="http://ptarcode.github.io/blog/2013/08/11/rails-3-generators-in-gem/"/>
    <updated>2013-08-11T18:02:00-03:00</updated>
    <id>http://ptarcode.github.io/blog/2013/08/11/rails-3-generators-in-gem</id>
    <content type="html"><![CDATA[<hr />

<!--more-->


<h3>This is the folders structure in a gem.</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>lib
</span><span class='line'>  - generators
</span><span class='line'>    - gemname
</span><span class='line'>      install_generator.rb
</span><span class='line'>      - templates
</span><span class='line'>        (template files)</span></code></pre></td></tr></table></div></figure>


<h3>Install Generator</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>require 'rails/generators'
</span><span class='line'>
</span><span class='line'>module ModuleName
</span><span class='line'>  module Generators
</span><span class='line'>    class InstallGenerator &lt; Rails::Generators::NamedBase
</span><span class='line'>      include Rails::Generators::Migration
</span><span class='line'>      
</span><span class='line'>      source_root File.expand_path("../templates", __FILE__)
</span><span class='line'>      
</span><span class='line'>      generators...
</span><span class='line'>      
</span><span class='line'>      def self.next_migration_number(path)
</span><span class='line'>          @migration_number = current_migration_number(path) + 1
</span><span class='line'>          ActiveRecord::Migration.next_migration_number(@migration_number)
</span><span class='line'>      end
</span><span class='line'>  
</span><span class='line'>    end
</span><span class='line'>   
</span><span class='line'>  end
</span><span class='line'>end</span></code></pre></td></tr></table></div></figure>


<h3>Generators&hellip;</h3>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>def generators
</span><span class='line'>           
</span><span class='line'>    generate("controller" , "nameOfController")
</span><span class='line'>    
</span><span class='line'>    copy_file "fileWantYouCopy.rb"   , "app/models/destiniAndNameToCopiedFile.rb"
</span><span class='line'>    
</span><span class='line'>    migration_template("modelOfMigrate.rb"  , "db/migrate/modelOfMigrateDestini.rb")
</span><span class='line'>end</span></code></pre></td></tr></table></div></figure>


<h3>migration_template</h3>

<p>You need add this include to use migration_template</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>include Rails::Generators::Migration</span></code></pre></td></tr></table></div></figure>


<p>You need to implement next_migration_number</p>

<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>def self.next_migration_number(path)
</span><span class='line'>      @migration_number = current_migration_number(path) + 1
</span><span class='line'>      ActiveRecord::Migration.next_migration_number(@migration_number)
</span><span class='line'>end</span></code></pre></td></tr></table></div></figure>


<hr />
]]></content>
  </entry>
  
</feed>