258 lines
13 KiB
HTML
258 lines
13 KiB
HTML
|
<?xml version="1.0" encoding="utf-8"?>
|
||
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
|
||
|
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
|
||
|
<html xmlns="http://www.w3.org/1999/xhtml" lang="fr" xml:lang="fr">
|
||
|
<head>
|
||
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
||
|
|
||
|
|
||
|
<link rel="shortcut icon" type="image/x-icon" href="/Scratch/img/favicon.ico" />
|
||
|
<link rel="stylesheet" type="text/css" href="/Scratch/assets/css/main.css" />
|
||
|
<link rel="stylesheet" type="text/css" href="/Scratch/css/twilight.css" />
|
||
|
<link rel="stylesheet" type="text/css" href="/Scratch/css/idc.css" />
|
||
|
<link rel="alternate" type="application/rss+xml" title="RSS" href="http://feeds.feedburner.com/yannespositocomfr"/>
|
||
|
|
||
|
<link rel="alternate" lang="fr" xml:lang="fr" title="Higher order function in zsh" type="text/html" hreflang="fr" href="/Scratch/fr/blog/Higher-order-function-in-zsh/" />
|
||
|
<link rel="alternate" lang="en" xml:lang="en" title="Higher order function in zsh" type="text/html" hreflang="en" href="/Scratch/en/blog/Higher-order-function-in-zsh/" />
|
||
|
<script type="text/javascript" src="/Scratch/js/jquery-1.3.1.min.js"></script>
|
||
|
<script type="text/javascript" src="/Scratch/js/jquery.cookie.js"></script>
|
||
|
<script type="text/javascript" src="/Scratch/js/index.js"></script>
|
||
|
<!--[if lt IE 9]>
|
||
|
<script src="http://ie7-js.googlecode.com/svn/version/2.1(beta4)/IE9.js"></script>
|
||
|
<![endif]-->
|
||
|
<!-- < % if containMaths %>
|
||
|
<script type="text/javascript" src="/Scratch/js/MathJax/MathJax.js"></script>
|
||
|
< % end %>
|
||
|
-->
|
||
|
<title>Higher order function in zsh</title>
|
||
|
</head>
|
||
|
<body lang="fr">
|
||
|
<script type="text/javascript">// <![CDATA[
|
||
|
document.write('<div id="blackpage"><img src="/Scratch/img/loading.gif" alt="Chargement en cours..."/></div>');
|
||
|
// ]]>
|
||
|
</script>
|
||
|
|
||
|
<div id="content">
|
||
|
|
||
|
<div id="choix">
|
||
|
<div class="return"><a href="#entete">↓ Menu ↓</a></div>
|
||
|
<div id="choixlang">
|
||
|
<a href="/Scratch/en/blog/Higher-order-function-in-zsh/" onclick="setLanguage('en')">in English</a>
|
||
|
</div>
|
||
|
</div>
|
||
|
<div id="titre">
|
||
|
<h1>
|
||
|
Higher order function in zsh
|
||
|
</h1>
|
||
|
|
||
|
</div>
|
||
|
|
||
|
<div class="flush"></div>
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
<div class="flush"></div>
|
||
|
<div id="afterheader">
|
||
|
<div class="corps">
|
||
|
<p><img alt="Title image" src="/Scratch/img/blog/Higher-order-function-in-zsh/main.png" /></p>
|
||
|
|
||
|
|
||
|
<div class="intro">
|
||
|
|
||
|
|
||
|
<p><span class="sc"><abbr title="Trop long à lire">tlàl</abbr> : </span> des fonctions d’ordres supérieurs en zsh.</p>
|
||
|
|
||
|
|
||
|
</div>
|
||
|
|
||
|
|
||
|
<p>Tout d’abord, pourquoi c’est important d’avoir ces fonctions.
|
||
|
Plus je programmais avec zsh plus j’essayais d’avoir un style fonctionnel.</p>
|
||
|
|
||
|
<p>Le minimum pour pouvoir avoir du code plus lisible c’est de posséder les fonctions <code>map</code>, <code>filter</code> et <code>fold</code>.</p>
|
||
|
|
||
|
<p>Voici pourquoi avec une comparaison.
|
||
|
Commençons par un programme qui converti tous les gif en png dans plusieurs répertoires projets contenant tous des répertoires resources.
|
||
|
Avant :</p>
|
||
|
|
||
|
<pre class="twilight">
|
||
|
<span class="Comment"><span class="Comment">#</span> for each directory in projects dir</span>
|
||
|
<span class="Keyword">for</span> toProject <span class="Keyword">in</span> /path/to/projects/*(/N)<span class="Keyword">;</span> <span class="Keyword">do</span>
|
||
|
<span class="Comment"><span class="Comment">#</span> toProject is /path/to/projects/foo</span>
|
||
|
<span class="Comment"><span class="Comment">#</span> project become foo (:t for tail)</span>
|
||
|
project=<span class="Variable"><span class="Variable">${</span>toProject:t<span class="Variable">}</span></span>
|
||
|
<span class="Keyword">for</span> toResource <span class="Keyword">in</span> <span class="Variable"><span class="Variable">$</span>toProject</span>/resources/*.gif(.N)<span class="Keyword">;</span> <span class="Keyword">do</span>
|
||
|
convert <span class="Variable"><span class="Variable">$</span>toResource</span> <span class="Variable"><span class="Variable">${</span>toResource:r<span class="Variable">}</span></span>.png
|
||
|
<span class="Constant">\r</span>m -f <span class="Variable"><span class="Variable">$</span>toResource</span>
|
||
|
<span class="Keyword">done</span>
|
||
|
<span class="Keyword">done</span>
|
||
|
</pre>
|
||
|
|
||
|
<p>Après</p>
|
||
|
|
||
|
<pre class="twilight">
|
||
|
<span class="Entity">gif_to_png</span>() { convert <span class="Variable"><span class="Variable">$</span>1</span> <span class="Variable"><span class="Variable">${</span>1:r<span class="Variable">}</span></span>.png <span class="Keyword">&&</span> <span class="Constant">\r</span>m -f <span class="Variable"><span class="Variable">$</span>1</span> }
|
||
|
<span class="Entity">handle_resources</span>() { map gif_to_png <span class="Variable"><span class="Variable">$</span>1</span>/resources/*.gif(.N) }
|
||
|
map handle_resources /path/to/projects/*(/N)
|
||
|
</pre>
|
||
|
|
||
|
<p>Plus de bloc !
|
||
|
Oui, c’est un poil plus difficile à lire pour les non initiés.
|
||
|
Mais c’est à la fois plus concis et plus robuste.</p>
|
||
|
|
||
|
<p>Et encore ce code ne possède pas de test.
|
||
|
Recommençons sur le même principe.</p>
|
||
|
|
||
|
<p>Trouver les fichiers des projets qui ne contiennent pas de s dans leur nom qui ont le même nom que leur projet.</p>
|
||
|
|
||
|
<pre class="twilight">
|
||
|
<span class="Keyword">for</span> toProject <span class="Keyword">in</span> Projects/*<span class="Keyword">;</span> <span class="Keyword">do</span>
|
||
|
project=<span class="Variable"><span class="Variable">$</span>toProject</span>:t
|
||
|
<span class="Keyword">if</span> print -- project <span class="Keyword">|</span> grep -v s <span class="Keyword">></span>/dev/null
|
||
|
<span class="Keyword">then</span>
|
||
|
print <span class="Variable"><span class="Variable">$</span>project</span>
|
||
|
<span class="Keyword">for</span> toResource <span class="Keyword">in</span> <span class="Variable"><span class="Variable">$</span>toProject</span>/*(.N)<span class="Keyword">;</span> <span class="Keyword">do</span>
|
||
|
<span class="Keyword">if</span> print -- <span class="Variable"><span class="Variable">${</span>toResource:t<span class="Variable">}</span></span> <span class="Keyword">|</span> grep <span class="Variable"><span class="Variable">$</span>project</span> <span class="Keyword">></span>/dev/null<span class="Keyword">;</span> <span class="Keyword">then</span>
|
||
|
print -- <span class="String"><span class="String">"</span>X <span class="StringVariable"><span class="StringVariable">$</span>toResource</span><span class="String">"</span></span>
|
||
|
<span class="Keyword">fi</span>
|
||
|
<span class="Keyword">done</span>
|
||
|
<span class="Keyword">fi</span>
|
||
|
<span class="Keyword">done</span>
|
||
|
</pre>
|
||
|
|
||
|
<p>After =></p>
|
||
|
|
||
|
<pre class="twilight">
|
||
|
<span class="Entity">contain_no_s</span>() { print <span class="Variable"><span class="Variable">$</span>1</span> <span class="Keyword">|</span> grep -v s }
|
||
|
function verify_file_name {
|
||
|
local project=<span class="Variable"><span class="Variable">$</span>1</span>:t
|
||
|
<span class="Entity">contains_project_name</span>() { print <span class="Variable"><span class="Variable">$</span>1</span>:t <span class="Keyword">|</span> grep <span class="Variable"><span class="Variable">$</span>project</span> }
|
||
|
map <span class="String"><span class="String">"</span>print -- X<span class="String">"</span></span> <span class="String"><span class="String">$(</span>filter contains_project_name <span class="StringVariable"><span class="StringVariable">$</span>1</span>/*<span class="String"><span class="String">(</span>.N<span class="String">)</span></span><span class="String">)</span></span>
|
||
|
}
|
||
|
map show_project_matchin_file <span class="String"><span class="String">$(</span> filter contain_no_s Projects/* <span class="String">)</span></span>
|
||
|
</pre>
|
||
|
|
||
|
<p>Also, the first verstion is a bit easier to read.
|
||
|
But the second one is clearly far superior in architecture.
|
||
|
Why?</p>
|
||
|
|
||
|
</div>
|
||
|
|
||
|
|
||
|
|
||
|
<div id="choixrss">
|
||
|
<a id="rss" href="http://feeds.feedburner.com/yannespositocomfr">
|
||
|
s'abonner
|
||
|
</a>
|
||
|
</div>
|
||
|
<script type="text/javascript">
|
||
|
$(document).ready(function(){
|
||
|
$('#comment').hide();
|
||
|
$('#clickcomment').click(showComments);
|
||
|
});
|
||
|
function showComments() {
|
||
|
$('#comment').show();
|
||
|
$('#clickcomment').fadeOut();
|
||
|
}
|
||
|
document.write('<div id="clickcomment">Commentaires</div>');
|
||
|
</script>
|
||
|
<div class="flush"></div>
|
||
|
<div class="corps" id="comment">
|
||
|
<h2 class="first">commentaires</h2>
|
||
|
<noscript>
|
||
|
Vous devez activer javascript pour commenter.
|
||
|
</noscript>
|
||
|
|
||
|
<script type="text/javascript">
|
||
|
var idcomments_acct = 'a307f0044511ff1b5cfca573fc0a52e7';
|
||
|
var idcomments_post_id = '/Scratch/fr/blog/Higher-order-function-in-zsh/';
|
||
|
var idcomments_post_url = 'http://yannesposito.com/Scratch/fr/blog/Higher-order-function-in-zsh/';
|
||
|
</script>
|
||
|
<span id="IDCommentsPostTitle" style="display:none"></span>
|
||
|
<script type='text/javascript' src='/Scratch/js/genericCommentWrapperV2.js'></script>
|
||
|
|
||
|
</div>
|
||
|
|
||
|
<div id="entete" class="corps_spaced">
|
||
|
<div id="liens">
|
||
|
<ul><li><a href="/Scratch/fr/">Bienvenue</a></li>
|
||
|
<li><a href="/Scratch/fr/blog/">Blog</a></li>
|
||
|
<li><a href="/Scratch/fr/softwares/">Softwares</a></li>
|
||
|
<li><a href="/Scratch/fr/about/">À propos</a></li></ul>
|
||
|
</div>
|
||
|
<div class="flush"></div>
|
||
|
<hr/>
|
||
|
<div id="next_before_articles">
|
||
|
<div id="previous_articles">
|
||
|
articles précédents
|
||
|
|
||
|
<div class="previous_article">
|
||
|
<a href="/Scratch/fr/blog/programming-language-experience/"><span class="nicer">«</span> programming language experience</a>
|
||
|
</div>
|
||
|
|
||
|
|
||
|
<div class="previous_article">
|
||
|
<a href="/Scratch/fr/blog/Learn-Vim-Progressively/"><span class="nicer">«</span> Apprenez Vim Progressivement</a>
|
||
|
</div>
|
||
|
|
||
|
|
||
|
<div class="previous_article">
|
||
|
<a href="/Scratch/fr/blog/Password-Management/"><span class="nicer">«</span> Password Management</a>
|
||
|
</div>
|
||
|
|
||
|
|
||
|
</div>
|
||
|
<div id="next_articles">
|
||
|
articles suivants
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
</div>
|
||
|
<div class="flush"></div>
|
||
|
</div>
|
||
|
</div>
|
||
|
|
||
|
|
||
|
<div id="bottom">
|
||
|
<div>
|
||
|
<a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/deed.fr">Droits de reproduction ©, Yann Esposito</a>
|
||
|
</div>
|
||
|
<div id="lastmod">
|
||
|
Écrit le : 27/09/2011
|
||
|
modifié le : 27/09/2011
|
||
|
</div>
|
||
|
<div>
|
||
|
Site entièrement réalisé avec
|
||
|
<a href="http://www.vim.org">Vim</a>
|
||
|
et
|
||
|
<a href="http://nanoc.stoneship.org">nanoc</a>
|
||
|
</div>
|
||
|
<div>
|
||
|
<a href="/Scratch/fr/validation/">Validation</a>
|
||
|
<a href="http://validator.w3.org/check?uri=referer"> [xhtml] </a>
|
||
|
.
|
||
|
<a href="http://jigsaw.w3.org/css-validator/check/referer?profile=css3"> [css] </a>
|
||
|
.
|
||
|
<a href="http://validator.w3.org/feed/check.cgi?url=http%3A//yannesposito.com/Scratch/fr/blog/feed/feed.xml">[rss]</a>
|
||
|
</div>
|
||
|
</div>
|
||
|
<div class="clear"></div>
|
||
|
</div>
|
||
|
<script type="text/javascript">
|
||
|
var clicky = { log: function(){ return; }, goal: function(){ return; }};
|
||
|
var clicky_site_id = 66374971;
|
||
|
(function() {
|
||
|
var s = document.createElement('script');
|
||
|
s.type = 'text/javascript';
|
||
|
s.async = true;
|
||
|
s.src = ( document.location.protocol == 'https:' ? 'https://static.getclicky.com/js' : 'http://static.getclicky.com/js' );
|
||
|
( document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0] ).appendChild( s );
|
||
|
})();
|
||
|
</script>
|
||
|
<noscript><p><img alt="Clicky" width="1" height="1" src="http://in.getclicky.com/66374971ns.gif" /></p></noscript>
|
||
|
|
||
|
</body>
|
||
|
</html>
|