Update Hugo, docs

1 files changed, 139 insertions, 136 deletions

diff --git a/docs/en/cowboy/2.0/guide/constraints/index.html b/docs/en/cowboy/2.0/guide/constraints/index.html
index 110adf07..570f49fe 100644
--- a/docs/en/cowboy/2.0/guide/constraints/index.html
+++ b/docs/en/cowboy/2.0/guide/constraints/index.html
@@ -7,7 +7,7 @@
     <meta name="description" content="">
     <meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara">
 
-    <meta name="generator" content="Hugo 0.17" />
+    <meta name="generator" content="Hugo 0.26" />
 
     <title>Nine Nines: Constraints</title>
 
@@ -67,147 +67,150 @@
 
 <h1 class="lined-header"><span>Constraints</span></h1>
 
-<div class="paragraph"><p>Constraints are validation and conversion functions applied

-to user input.</p></div>

-<div class="paragraph"><p>They are used in various places in Cowboy, including the

-router and the <code>cowboy_req</code> match functions.</p></div>

-<div class="sect1">

-<h2 id="_syntax">Syntax</h2>

-<div class="sectionbody">

-<div class="paragraph"><p>Constraints are provided as a list of fields. For each field

-in the list, specific constraints can be applied, as well as

-a default value if the field is missing.</p></div>

-<div class="paragraph"><p>A field can take the form of an atom <code>field</code>, a tuple with

-constraints <code>{field, Constraints}</code> or a tuple with constraints

-and a default value <code>{field, Constraints, Default}</code>.

-The <code>field</code> form indicates the field is mandatory.</p></div>

-<div class="paragraph"><p>Note that when used with the router, only the second form

-makes sense, as it does not use the default and the field

-is always defined.</p></div>

-<div class="paragraph"><p>Constraints for each field are provided as an ordered list

-of atoms or funs to apply. Built-in constraints are provided

-as atoms, while custom constraints are provided as funs.</p></div>

-<div class="paragraph"><p>When multiple constraints are provided, they are applied in

-the order given. If the value has been modified by a constraint

-then the next one receives the new value.</p></div>

-<div class="paragraph"><p>For example, the following constraints will first validate

-and convert the field <code>my_value</code> to an integer, and then

-check that the integer is positive:</p></div>

-<div class="listingblock">

-<div class="content"><!-- Generator: GNU source-highlight 3.1.8

-by Lorenzo Bettini

-http://www.lorenzobettini.it

-http://www.gnu.org/software/src-highlite -->

-<pre><tt><span style="color: #009900">PositiveFun</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #0000FF">fun</span></span>

-    (<span style="color: #990000">_</span>, <span style="color: #009900">V</span>) <span style="font-weight: bold"><span style="color: #0000FF">when</span></span> <span style="color: #009900">V</span> <span style="color: #990000">&gt;</span> <span style="color: #993399">0</span> <span style="color: #990000">-&gt;</span>

-        {<span style="color: #FF6600">ok</span>, <span style="color: #009900">V</span>};

-    (<span style="color: #990000">_</span>, <span style="color: #990000">_</span>) <span style="color: #990000">-&gt;</span>

-        {<span style="color: #FF6600">error</span>, <span style="color: #FF6600">not_positive</span>}

-<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>,

-{<span style="color: #FF6600">my_value</span>, [<span style="color: #FF6600">int</span>, <span style="color: #009900">PositiveFun</span>]}<span style="color: #990000">.</span></tt></pre></div></div>

-<div class="paragraph"><p>We ignore the first fun argument in this snippet. We shouldn&#8217;t.

-We will simply learn what it is later in this chapter.</p></div>

-<div class="paragraph"><p>When there&#8217;s only one constraint, it can be provided directly

-without wrapping it into a list:</p></div>

-<div class="listingblock">

-<div class="content"><!-- Generator: GNU source-highlight 3.1.8

-by Lorenzo Bettini

-http://www.lorenzobettini.it

-http://www.gnu.org/software/src-highlite -->

-<pre><tt>{<span style="color: #FF6600">my_value</span>, <span style="color: #FF6600">int</span>}</tt></pre></div></div>

-</div>

-</div>

-<div class="sect1">

-<h2 id="_built_in_constraints">Built-in constraints</h2>

-<div class="sectionbody">

-<div class="paragraph"><p>Built-in constraints are specified as an atom:</p></div>

-<div class="tableblock">

-<table rules="all"

-width="100%"

-frame="border"

-cellspacing="0" cellpadding="4">

-<col width="50%" />

-<col width="50%" />

-<thead>

-<tr>

-<th align="left" valign="top"> Constraint </th>

-<th align="left" valign="top"> Description</th>

-</tr>

-</thead>

-<tbody>

-<tr>

-<td align="left" valign="top"><p class="table">int</p></td>

-<td align="left" valign="top"><p class="table">Converts binary value to integer.</p></td>

-</tr>

-<tr>

-<td align="left" valign="top"><p class="table">nonempty</p></td>

-<td align="left" valign="top"><p class="table">Ensures the binary value is non-empty.</p></td>

-</tr>

-</tbody>

-</table>

-</div>

-</div>

-</div>

-<div class="sect1">

-<h2 id="_custom_constraints">Custom constraints</h2>

-<div class="sectionbody">

-<div class="paragraph"><p>Custom constraints are specified as a fun. This fun takes

-two arguments. The first argument indicates the operation

-to be performed, and the second is the value. What the

-value is and what must be returned depends on the operation.</p></div>

-<div class="paragraph"><p>Cowboy currently defines three operations. The operation

-used for validating and converting user input is the <code>forward</code>

-operation.</p></div>

-<div class="listingblock">

-<div class="content"><!-- Generator: GNU source-highlight 3.1.8

-by Lorenzo Bettini

-http://www.lorenzobettini.it

-http://www.gnu.org/software/src-highlite -->

-<pre><tt><span style="font-weight: bold"><span style="color: #000000">int</span></span>(<span style="color: #FF6600">forward</span>, <span style="color: #009900">Value</span>) <span style="color: #990000">-&gt;</span>

-    <span style="font-weight: bold"><span style="color: #0000FF">try</span></span>

-        {<span style="color: #FF6600">ok</span>, <span style="font-weight: bold"><span style="color: #000000">binary_to_integer</span></span>(<span style="color: #009900">Value</span>)}

-    <span style="font-weight: bold"><span style="color: #0000FF">catch</span></span> <span style="color: #990000">_:_</span> <span style="color: #990000">-&gt;</span>

-        {<span style="color: #FF6600">error</span>, <span style="color: #FF6600">not_an_integer</span>}

-    <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>;</tt></pre></div></div>

-<div class="paragraph"><p>The value must be returned even if it is not converted

-by the constraint.</p></div>

-<div class="paragraph"><p>The <code>reverse</code> operation does the opposite: it

-takes a converted value and changes it back to what the

-user input would have been.</p></div>

-<div class="listingblock">

-<div class="content"><!-- Generator: GNU source-highlight 3.1.8

-by Lorenzo Bettini

-http://www.lorenzobettini.it

-http://www.gnu.org/software/src-highlite -->

-<pre><tt><span style="font-weight: bold"><span style="color: #000000">int</span></span>(<span style="color: #FF6600">reverse</span>, <span style="color: #009900">Value</span>) <span style="color: #990000">-&gt;</span>

-        <span style="font-weight: bold"><span style="color: #0000FF">try</span></span>

-                {<span style="color: #FF6600">ok</span>, <span style="font-weight: bold"><span style="color: #000000">integer_to_binary</span></span>(<span style="color: #009900">Value</span>)}

-        <span style="font-weight: bold"><span style="color: #0000FF">catch</span></span> <span style="color: #990000">_:_</span> <span style="color: #990000">-&gt;</span>

-                {<span style="color: #FF6600">error</span>, <span style="color: #FF6600">not_an_integer</span>}

-        <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>;</tt></pre></div></div>

-<div class="paragraph"><p>Finally, the <code>format_error</code> operation takes an error

-returned by any other operation and returns a formatted

-human-readable error message.</p></div>

-<div class="listingblock">

-<div class="content"><!-- Generator: GNU source-highlight 3.1.8

-by Lorenzo Bettini

-http://www.lorenzobettini.it

-http://www.gnu.org/software/src-highlite -->

-<pre><tt><span style="font-weight: bold"><span style="color: #000000">int</span></span>(<span style="color: #FF6600">format_error</span>, {<span style="color: #FF6600">not_an_integer</span>, <span style="color: #009900">Value</span>}) <span style="color: #990000">-&gt;</span>

-        <span style="font-weight: bold"><span style="color: #000000">io_lib:format</span></span>(<span style="color: #FF0000">"The value ~p is not an integer."</span>, [<span style="color: #009900">Value</span>])<span style="color: #990000">.</span></tt></pre></div></div>

-<div class="paragraph"><p>Notice that for this case you get both the error and

-the value that was given to the constraint that produced

-this error.</p></div>

-<div class="paragraph"><p>Cowboy will not catch exceptions coming from constraint

-functions. They should be written to not emit any exceptions.</p></div>

-</div>

-</div>

+<div class="paragraph"><p>Constraints are validation and conversion functions applied
+to user input.</p></div>
+<div class="paragraph"><p>They are used in various places in Cowboy, including the
+router and the <code>cowboy_req</code> match functions.</p></div>
+<div class="sect1">
+<h2 id="_syntax">Syntax</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Constraints are provided as a list of fields. For each field
+in the list, specific constraints can be applied, as well as
+a default value if the field is missing.</p></div>
+<div class="paragraph"><p>A field can take the form of an atom <code>field</code>, a tuple with
+constraints <code>{field, Constraints}</code> or a tuple with constraints
+and a default value <code>{field, Constraints, Default}</code>.
+The <code>field</code> form indicates the field is mandatory.</p></div>
+<div class="paragraph"><p>Note that when used with the router, only the second form
+makes sense, as it does not use the default and the field
+is always defined.</p></div>
+<div class="paragraph"><p>Constraints for each field are provided as an ordered list
+of atoms or funs to apply. Built-in constraints are provided
+as atoms, while custom constraints are provided as funs.</p></div>
+<div class="paragraph"><p>When multiple constraints are provided, they are applied in
+the order given. If the value has been modified by a constraint
+then the next one receives the new value.</p></div>
+<div class="paragraph"><p>For example, the following constraints will first validate
+and convert the field <code>my_value</code> to an integer, and then
+check that the integer is positive:</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="color: #009900">PositiveFun</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #0000FF">fun</span></span>
+    (<span style="color: #990000">_</span>, <span style="color: #009900">V</span>) <span style="font-weight: bold"><span style="color: #0000FF">when</span></span> <span style="color: #009900">V</span> <span style="color: #990000">&gt;</span> <span style="color: #993399">0</span> <span style="color: #990000">-&gt;</span>
+        {<span style="color: #FF6600">ok</span>, <span style="color: #009900">V</span>};
+    (<span style="color: #990000">_</span>, <span style="color: #990000">_</span>) <span style="color: #990000">-&gt;</span>
+        {<span style="color: #FF6600">error</span>, <span style="color: #FF6600">not_positive</span>}
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>,
+{<span style="color: #FF6600">my_value</span>, [<span style="color: #FF6600">int</span>, <span style="color: #009900">PositiveFun</span>]}<span style="color: #990000">.</span></tt></pre></div></div>
+<div class="paragraph"><p>We ignore the first fun argument in this snippet. We shouldn&#8217;t.
+We will simply learn what it is later in this chapter.</p></div>
+<div class="paragraph"><p>When there&#8217;s only one constraint, it can be provided directly
+without wrapping it into a list:</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt>{<span style="color: #FF6600">my_value</span>, <span style="color: #FF6600">int</span>}</tt></pre></div></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_built_in_constraints">Built-in constraints</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Built-in constraints are specified as an atom:</p></div>
+<div class="tableblock">
+<table rules="all"
+width="100%"
+frame="border"
+cellspacing="0" cellpadding="4">
+<col width="50%" />
+<col width="50%" />
+<thead>
+<tr>
+<th align="left" valign="top"> Constraint </th>
+<th align="left" valign="top"> Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td align="left" valign="top"><p class="table">int</p></td>
+<td align="left" valign="top"><p class="table">Converts binary value to integer.</p></td>
+</tr>
+<tr>
+<td align="left" valign="top"><p class="table">nonempty</p></td>
+<td align="left" valign="top"><p class="table">Ensures the binary value is non-empty.</p></td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_custom_constraints">Custom constraints</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Custom constraints are specified as a fun. This fun takes
+two arguments. The first argument indicates the operation
+to be performed, and the second is the value. What the
+value is and what must be returned depends on the operation.</p></div>
+<div class="paragraph"><p>Cowboy currently defines three operations. The operation
+used for validating and converting user input is the <code>forward</code>
+operation.</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000000">int</span></span>(<span style="color: #FF6600">forward</span>, <span style="color: #009900">Value</span>) <span style="color: #990000">-&gt;</span>
+    <span style="font-weight: bold"><span style="color: #0000FF">try</span></span>
+        {<span style="color: #FF6600">ok</span>, <span style="font-weight: bold"><span style="color: #000000">binary_to_integer</span></span>(<span style="color: #009900">Value</span>)}
+    <span style="font-weight: bold"><span style="color: #0000FF">catch</span></span> <span style="color: #990000">_:_</span> <span style="color: #990000">-&gt;</span>
+        {<span style="color: #FF6600">error</span>, <span style="color: #FF6600">not_an_integer</span>}
+    <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>;</tt></pre></div></div>
+<div class="paragraph"><p>The value must be returned even if it is not converted
+by the constraint.</p></div>
+<div class="paragraph"><p>The <code>reverse</code> operation does the opposite: it
+takes a converted value and changes it back to what the
+user input would have been.</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000000">int</span></span>(<span style="color: #FF6600">reverse</span>, <span style="color: #009900">Value</span>) <span style="color: #990000">-&gt;</span>
+        <span style="font-weight: bold"><span style="color: #0000FF">try</span></span>
+                {<span style="color: #FF6600">ok</span>, <span style="font-weight: bold"><span style="color: #000000">integer_to_binary</span></span>(<span style="color: #009900">Value</span>)}
+        <span style="font-weight: bold"><span style="color: #0000FF">catch</span></span> <span style="color: #990000">_:_</span> <span style="color: #990000">-&gt;</span>
+                {<span style="color: #FF6600">error</span>, <span style="color: #FF6600">not_an_integer</span>}
+        <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>;</tt></pre></div></div>
+<div class="paragraph"><p>Finally, the <code>format_error</code> operation takes an error
+returned by any other operation and returns a formatted
+human-readable error message.</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000000">int</span></span>(<span style="color: #FF6600">format_error</span>, {<span style="color: #FF6600">not_an_integer</span>, <span style="color: #009900">Value</span>}) <span style="color: #990000">-&gt;</span>
+        <span style="font-weight: bold"><span style="color: #000000">io_lib:format</span></span>(<span style="color: #FF0000">"The value ~p is not an integer."</span>, [<span style="color: #009900">Value</span>])<span style="color: #990000">.</span></tt></pre></div></div>
+<div class="paragraph"><p>Notice that for this case you get both the error and
+the value that was given to the constraint that produced
+this error.</p></div>
+<div class="paragraph"><p>Cowboy will not catch exceptions coming from constraint
+functions. They should be written to not emit any exceptions.</p></div>
+</div>
+</div>
 
 
 
 	
 		
 		
+		
+		
+		
 
 		<nav style="margin:1em 0">