hg.stevelosh.com > docs.stevelosh.com

e9e8c7460182 

cl-digraph: Update site.
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author Steve Losh <steve@stevelosh.com>
date Sun, 06 Nov 2016 23:49:33 +0000
parents be9b7c8cdbbc
children 6da20bc6b4fd
branches/tags (none)
files cl-digraph/_dmedia/bootstrap.css cl-digraph/_dmedia/less.js cl-digraph/_dmedia/pygments-clean.css cl-digraph/_dmedia/style.less cl-digraph/_dmedia/tango.css cl-digraph/changelog/index.html cl-digraph/index.html cl-digraph/installation/index.html cl-digraph/overview/index.html cl-digraph/reference-dot/index.html cl-digraph/reference/index.html cl-digraph/usage/index.html

Changes

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cl-digraph/_dmedia/bootstrap.css	Sun Nov 06 23:49:33 2016 +0000
@@ -0,0 +1,356 @@
+html,body{margin:0;padding:0;}
+h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,cite,code,del,dfn,em,img,q,s,samp,small,strike,strong,sub,sup,tt,var,dd,dl,dt,li,ol,ul,fieldset,form,label,legend,button,table,caption,tbody,tfoot,thead,tr,th,td{margin:0;padding:0;border:0;font-weight:normal;font-style:normal;font-size:100%;line-height:1;font-family:inherit;}
+table{border-collapse:collapse;border-spacing:0;}
+ol,ul{list-style:none;}
+q:before,q:after,blockquote:before,blockquote:after{content:"";}
+html{overflow-y:scroll;font-size:100%;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%;}
+a:focus{outline:thin dotted;}
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+article,aside,details,figcaption,figure,footer,header,hgroup,nav,section{display:block;}
+audio,canvas,video{display:inline-block;*display:inline;*zoom:1;}
+audio:not([controls]){display:none;}
+sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline;}
+sup{top:-0.5em;}
+sub{bottom:-0.25em;}
+img{border:0;-ms-interpolation-mode:bicubic;}
+button,input,select,textarea{font-size:100%;margin:0;vertical-align:baseline;*vertical-align:middle;}
+button,input{line-height:normal;*overflow:visible;}
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+input[type="search"]::-webkit-search-decoration{-webkit-appearance:none;}
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+table .purple{color:#7a43b6;border-bottom-color:#7a43b6;}
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cl-digraph/_dmedia/less.js	Sun Nov 06 23:49:33 2016 +0000
@@ -0,0 +1,9 @@
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+// http://lesscss.org
+// 
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+// Licensed under the Apache 2.0 License.
+//
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cl-digraph/_dmedia/pygments-clean.css	Sun Nov 06 23:49:33 2016 +0000
@@ -0,0 +1,61 @@
+/* @override http://localhost:8080/media/css/pygments-monokai-light.css */
+div.codehilite .hll { background-color: #49483e }
+/* div.codehilite .err { color: #fff; background-color: #f00 } /1* Error *1/ */
+div.codehilite .err { color: #111; } /* Error */
+div.codehilite .k { color: #111} /* Keyword */
+div.codehilite .l { color: #111 } /* Literal */
+div.codehilite .n { color: #111 } /* Name */
+div.codehilite .o { color: #111 } /* Operator */
+div.codehilite .p { color: #111 } /* Punctuation */
+div.codehilite .c  { color: #714678; font-style: italic; font-weight: bold; } /* Comment */
+div.codehilite .cm { color: #714678; font-style: italic; font-weight: bold; } /* Comment.Multiline */
+div.codehilite .cp { color: #714678; font-style: italic; font-weight: bold; } /* Comment.Preproc */
+div.codehilite .c1 { color: #714678; font-style: italic; font-weight: bold; } /* Comment.Single */
+div.codehilite .cs { color: #714678; font-style: italic; font-weight: bold; } /* Comment.Special */
+div.codehilite .ge { font-style: italic } /* Generic.Emph */
+div.codehilite .gs { font-weight: bold } /* Generic.Strong */
+div.codehilite .kc { color: #111 } /* Keyword.Constant */
+div.codehilite .kd { color: #111 } /* Keyword.Declaration */
+div.codehilite .kn { color: #111 } /* Keyword.Namespace */
+div.codehilite .kp { color: #111 } /* Keyword.Pseudo */
+div.codehilite .kr { color: #111 } /* Keyword.Reserved */
+div.codehilite .kt { color: #111 } /* Keyword.Type */
+div.codehilite .ld { color: #111 } /* Literal.Date */
+div.codehilite .m { color: #111 } /* Literal.Number */
+div.codehilite .s { color: #111; font-style: italic; } /* Literal.String */
+div.codehilite .na { color: #111 } /* Name.Attribute */
+div.codehilite .nb { color: #111 } /* Name.Builtin */
+div.codehilite .nc { color: #111 } /* Name.Class */
+div.codehilite .no { color: #111 } /* Name.Constant */
+div.codehilite .nd { color: #111 } /* Name.Decorator */
+div.codehilite .ni { color: #111 } /* Name.Entity */
+div.codehilite .ne { color: #111 } /* Name.Exception */
+div.codehilite .nf { color: #111} /* Name.Function */
+div.codehilite .nl { color: #111 } /* Name.Label */
+div.codehilite .nn { color: #111} /* Name.Namespace */
+div.codehilite .nx { color: #111 } /* Name.Other */
+div.codehilite .py { color: #111 } /* Name.Property */
+div.codehilite .nt { color: #111 } /* Name.Tag */
+div.codehilite .nv { color: #111 } /* Name.Variable */
+div.codehilite .ow { color: #111 } /* Operator.Word */
+div.codehilite .w { color: #111 } /* Text.Whitespace */
+div.codehilite .mf { color: #111 } /* Literal.Number.Float */
+div.codehilite .mh { color: #111 } /* Literal.Number.Hex */
+div.codehilite .mi { color: #111 } /* Literal.Number.Integer */
+div.codehilite .mo { color: #111 } /* Literal.Number.Oct */
+div.codehilite .sb { color: #111 } /* Literal.String.Backtick */
+div.codehilite .sc { color: #111 } /* Literal.String.Char */
+div.codehilite .sd { color: #111 } /* Literal.String.Doc */
+div.codehilite .s2 { color: #111 } /* Literal.String.Double */
+div.codehilite .se { color: #111 } /* Literal.String.Escape */
+div.codehilite .sh { color: #111 } /* Literal.String.Heredoc */
+div.codehilite .si { color: #111 } /* Literal.String.Interpol */
+div.codehilite .sx { color: #111 } /* Literal.String.Other */
+div.codehilite .sr { color: #111 } /* Literal.String.Regex */
+div.codehilite .s1 { color: #111 } /* Literal.String.Single */
+div.codehilite .ss { color: #111 } /* Literal.String.Symbol */
+div.codehilite .bp { color: #111 } /* Name.Builtin.Pseudo */
+div.codehilite .vc { color: #111 } /* Name.Variable.Class */
+div.codehilite .vg { color: #111 } /* Name.Variable.Global */
+div.codehilite .vi { color: #111 } /* Name.Variable.Instance */
+div.codehilite .il { color: #111 } /* Literal.Number.Integer.Long */
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cl-digraph/_dmedia/style.less	Sun Nov 06 23:49:33 2016 +0000
@@ -0,0 +1,157 @@
+html {
+    overflow-y: scroll;
+}
+.wrap {
+    width: 600px;
+    margin: 40px auto 180px;
+}
+body {
+    font-size: 18px;
+    line-height: 1.4;
+    font-family: Georgia, Palatino, "Palatino Linotype", serif;
+    color: #111111;
+}
+a {
+    text-decoration: none;
+    color: #0069d6;
+}
+h1, h2, h3, h4, h5 {
+    font-family: Palatino, "Palatino Linotype", serif;
+
+    a {
+        color: #111111;
+
+        &:hover {
+            color: #0069d6;
+        }
+    }
+}
+h1 {
+    font-size: 48px;
+    line-height: 1;
+}
+h2 {
+    font-size: 34px;
+    line-height: 1;
+    margin-top: 40px;
+    margin-bottom: 0;
+
+    code {
+        font-size: 34px;
+        border: none;
+        background: #fff4f4;
+        padding: 0px 5px;
+    }
+}
+h3 {
+    font-size: 26px;
+    line-height: 1;
+    margin-top: 40px;
+    margin-bottom: 0;
+
+    code {
+        font-size: 24px;
+        border: none;
+        background: #fff4f4;
+        padding: 0px 5px;
+    }
+}
+h4 {
+    font-size: 20px;
+    line-height: 1;
+    margin-top: 30px;
+    margin-bottom: 0;
+
+    code {
+        font-size: 18px;
+        border: none;
+        background: #fff4f4;
+        padding: 0px 5px;
+    }
+}
+h5 {
+    font-size: 16px;
+    line-height: 1;
+    margin-top: 18px;
+    margin-bottom: 0;
+
+    code {
+        font-size: 14px/1;
+        border: none;
+        background: #fff4f4;
+        padding: 0px 5px;
+    }
+}
+pre {
+    font-size: 15px;
+    line-height: 1.3;
+    white-space: pre;
+    overflow-x: auto;
+    border: 1px solid #fdd;
+    background: #fffafa;
+    padding: 10px 10px;
+    font-family: Menlo, Monaco, Consolas, monospace;
+}
+code {
+    font-size: 15px;
+    border: 1px solid #fdd;
+    background: #fffafa;
+    padding: 1px 4px;
+    font-family: Menlo, Monaco, Consolas, monospace;
+}
+ol, ul {
+    margin-bottom: 9px;
+}
+footer {
+    margin-top: 36px;
+    border-top: 1px solid #eee;
+    text-align: center;
+}
+body.index {
+    header {
+        text-align: center;
+
+        h1 {
+            font-size: 56px/1;
+            margin-bottom: 40px;
+        }
+    }
+    h2 {
+        font-size: 28px/1;
+    }
+    ol.toc {
+        list-style-type: none;
+        margin-left: 0;
+        margin-left: 0px;
+        padding-left: 0px;
+    }
+}
+body.content {
+    header {
+        float: right;
+        position: relative;
+        min-width: 150px;
+
+        h1 {
+            text-align: right;
+            font-size: 24px;
+            line-height: 1;
+            margin-top: 0px;
+        }
+    }
+    .toc {
+        ul {
+            list-style-type: none;
+            margin-left: 0px;
+            padding-left: 0px;
+
+            ul {
+                margin-left: 20px;
+                margin-bottom: 0;
+            }
+        }
+    }
+    img {
+        max-width: 500px;
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cl-digraph/_dmedia/tango.css	Sun Nov 06 23:49:33 2016 +0000
@@ -0,0 +1,71 @@
+.codehilite .hll { background-color: #ffffcc }
+.codehilite .c { color: #8f5902; font-style: italic } /* Comment */
+.codehilite .err { color: #a40000; border: 1px solid #ef2929 } /* Error */
+.codehilite .g { color: #000000 } /* Generic */
+.codehilite .k { color: #204a87; font-weight: bold } /* Keyword */
+.codehilite .l { color: #000000 } /* Literal */
+.codehilite .n { color: #000000 } /* Name */
+.codehilite .o { color: #ce5c00; font-weight: bold } /* Operator */
+.codehilite .x { color: #000000 } /* Other */
+.codehilite .p { color: #000000; font-weight: bold } /* Punctuation */
+.codehilite .cm { color: #8f5902; font-style: italic } /* Comment.Multiline */
+.codehilite .cp { color: #8f5902; font-style: italic } /* Comment.Preproc */
+.codehilite .c1 { color: #8f5902; font-style: italic } /* Comment.Single */
+.codehilite .cs { color: #8f5902; font-style: italic } /* Comment.Special */
+.codehilite .gd { color: #a40000 } /* Generic.Deleted */
+.codehilite .ge { color: #000000; font-style: italic } /* Generic.Emph */
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+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cl-digraph/changelog/index.html	Sun Nov 06 23:49:33 2016 +0000
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="utf-8"/>
+        <title>Changelog / cl-digraph</title>
+        <link rel="stylesheet" href="../_dmedia/pygments-clean.css"/>
+        <link rel="stylesheet/less" type="text/css" href="../_dmedia/style.less"/>
+        <script src="../_dmedia/less.js" type="text/javascript">
+        </script>
+    </head>
+    <body class="content">
+        <div class="wrap">
+            <header><h1><a href="..">cl-digraph</a></h1></header>
+                <div class="markdown">
+<h1 id="changelog"><a href="">Changelog</a></h1><p>Here's the list of changes in each released version.</p>
+<div class="toc">
+<ul>
+<li><a href="#v100">v1.0.0</a></li>
+</ul></div>
+<h2 id="v100">v1.0.0</h2>
+<p>Initial version.</p>
+                </div>
+            <footer><p><i>Made with Lisp and love by <a href="http://stevelosh.com/">Steve Losh</a> in Reykjavík, Iceland.</i></p>
+<script>
+  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+
+  ga('create', 'UA-15328874-3', 'auto');
+  ga('send', 'pageview');
+
+</script></footer>
+        </div>
+    </body>
+</html>
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cl-digraph/index.html	Sun Nov 06 23:49:33 2016 +0000
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="utf-8" />
+        <title>cl-digraph</title>
+        <link rel="stylesheet" href="./_dmedia/pygments-clean.css"/>
+        <link rel="stylesheet/less" type="text/css" href="./_dmedia/style.less">
+        <script src="./_dmedia/less.js" type="text/javascript">
+        </script>
+    </head>
+    <body class="index">
+        <div class="wrap">
+            <header><h1><a href="">cl-digraph</a></h1></header>
+                <div class="markdown">
+<p>cl-digraph is an implementation of a mutable <a href="https://en.wikipedia.org/wiki/Directed_graph">directed graph</a> data structure
+for Common Lisp.</p>
+<ul>
+<li><strong>License:</strong> MIT/X11</li>
+<li><strong>Documentation:</strong> <a href="http://sjl.bitbucket.org/cl-digraph/">http://sjl.bitbucket.org/cl-digraph/</a></li>
+<li><strong>Mercurial:</strong> <a href="http://bitbucket.org/sjl/cl-digraph/">http://bitbucket.org/sjl/cl-digraph/</a></li>
+<li><strong>Git:</strong> <a href="http://github.com/sjl/cl-digraph/">http://github.com/sjl/cl-digraph/</a></li>
+</ul>
+<p>cl-digraph focuses on simplicity, correctness, and usability.  Performance is
+not <em>terrible</em>, but is not a high priority.</p>
+<p>The test suite currently passes in SBCL, CCL, ECL, and ABCL on OS X.  Further
+testing is welcome.</p><h2>Table of Contents</h2><ol class="toc"><li><a href="installation/">Installation</a></li><li><a href="usage/">Usage</a></li><li><a href="reference/"> API Reference</a></li><li><a href="reference-dot/"> cl-dot Support</a></li><li><a href="changelog/">Changelog</a></li></ol>
+                </div>
+            <footer><p><i>Made with Lisp and love by <a href="http://stevelosh.com/">Steve Losh</a> in Reykjavík, Iceland.</i></p>
+<script>
+  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+
+  ga('create', 'UA-15328874-3', 'auto');
+  ga('send', 'pageview');
+
+</script></footer>
+        </div>
+    </body>
+</html>
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cl-digraph/installation/index.html	Sun Nov 06 23:49:33 2016 +0000
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="utf-8"/>
+        <title>Installation / cl-digraph</title>
+        <link rel="stylesheet" href="../_dmedia/pygments-clean.css"/>
+        <link rel="stylesheet/less" type="text/css" href="../_dmedia/style.less"/>
+        <script src="../_dmedia/less.js" type="text/javascript">
+        </script>
+    </head>
+    <body class="content">
+        <div class="wrap">
+            <header><h1><a href="..">cl-digraph</a></h1></header>
+                <div class="markdown">
+<h1 id="installation"><a href="">Installation</a></h1><p>cl-digraph is compatible with Quicklisp, but not <em>in</em> Quicklisp (yet?).  You can
+clone the repository into your <a href="https://www.quicklisp.org/beta/faq.html#local-project">Quicklisp local-projects</a> directory for
+now.</p>
+<p>The <code>cl-digraph</code> system contains the core API and has no dependencies.</p>
+<p>The <code>cl-digraph.dot</code> system contains support for drawing digraphs with Graphviz
+using <a href="https://github.com/michaelw/cl-dot">cl-dot</a>.</p>
+<p>The <code>cl-digraph.test</code> system contains the test suite, which uses <a href="https://github.com/lmj/1am">1am</a>.</p>
+                </div>
+            <footer><p><i>Made with Lisp and love by <a href="http://stevelosh.com/">Steve Losh</a> in Reykjavík, Iceland.</i></p>
+<script>
+  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+
+  ga('create', 'UA-15328874-3', 'auto');
+  ga('send', 'pageview');
+
+</script></footer>
+        </div>
+    </body>
+</html>
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cl-digraph/overview/index.html	Sun Nov 06 23:49:33 2016 +0000
@@ -0,0 +1,89 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="utf-8"/>
+        <title>Overview / beast</title>
+        <link rel="stylesheet" href="../_dmedia/tango.css"/>
+        <link rel="stylesheet/less" type="text/css" href="../_dmedia/style.less"/>
+        <script src="../_dmedia/less.js" type="text/javascript">
+        </script>
+    </head>
+    <body class="content">
+        <div class="wrap">
+            <header><h1><a href="..">beast</a></h1></header>
+                <div class="markdown">
+<h1 id="overview"><a href="">Overview</a></h1><p>When you're making a video game you need a way to model things in the game
+world.  In the past couple of decades Entity/Component systems have become
+popular:</p>
+<ul>
+<li><a href="http://gameprogrammingpatterns.com/component.html">http://gameprogrammingpatterns.com/component.html</a></li>
+<li><a href="http://en.wikipedia.org/wiki/Entity_component_system">http://en.wikipedia.org/wiki/Entity_component_system</a></li>
+<li><a href="http://www.gamedev.net/page/resources/_/technical/game-programming/understanding-component-entity-systems-r3013">http://www.gamedev.net/page/resources/_/technical/game-programming/understanding-component-entity-systems-r3013</a></li>
+</ul>
+<p>There are a couple of ECS libraries for Common Lisp already:</p>
+<ul>
+<li><a href="https://github.com/lispgames/cl-ecs">cl-ecs</a></li>
+<li><a href="https://github.com/mfiano/ecstasy">ecstasy</a></li>
+</ul>
+<p>Both of these favor composition over inheritance -- game objects (entities)
+<em>contain</em> various components, but they don't <em>inherit</em> from components.</p>
+<p>Beast takes the opposite approach, favoring (restricted) inheritance over
+composition.</p>
+<p>Components in Beast are called "aspects" to try to overload the word "component"
+a little bit less in this crazy world.  Aspects are essentially
+<a href="https://en.wikipedia.org/wiki/Mixin">mixins</a>, with some sugar for defining them
+and running systems over them:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nv">define-aspect</span> <span class="nv">throwable</span> <span class="nv">accuracy</span> <span class="nv">damage</span><span class="p">)</span>
+<span class="p">(</span><span class="nv">define-aspect</span> <span class="nv">edible</span> <span class="nv">nutrition-value</span><span class="p">)</span>
+
+<span class="p">(</span><span class="nv">define-entity</span> <span class="nv">dart</span> <span class="p">(</span><span class="nv">throwable</span><span class="p">))</span>
+<span class="p">(</span><span class="nv">define-entity</span> <span class="nv">cheese</span> <span class="p">(</span><span class="nv">edible</span><span class="p">))</span>
+<span class="p">(</span><span class="nv">define-entity</span> <span class="nv">pie</span> <span class="p">(</span><span class="nv">throwable</span> <span class="nv">edible</span><span class="p">))</span>
+
+<span class="p">(</span><span class="nv">define-system</span> <span class="nv">rot-food</span> <span class="p">((</span><span class="nv">e</span> <span class="nv">edible</span><span class="p">))</span>
+  <span class="p">(</span><span class="nb">decf</span> <span class="p">(</span><span class="nv">edible/nutrition-value</span> <span class="nv">e</span><span class="p">))</span>
+  <span class="p">(</span><span class="nb">when</span> <span class="p">(</span><span class="nb">zerop</span> <span class="p">(</span><span class="nv">edible/nutrition-value</span> <span class="nv">e</span><span class="p">))</span>
+    <span class="p">(</span><span class="nv">destroy-entity</span> <span class="nv">e</span><span class="p">)))</span>
+
+<span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*steel-dart*</span> 
+  <span class="p">(</span><span class="nv">create-entity</span> <span class="ss">'dart</span>
+    <span class="ss">:throwable/accuracy</span> <span class="mf">0.9</span>
+    <span class="ss">:throwable/damage</span> <span class="mi">10</span><span class="p">))</span>
+
+<span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*hunk-of-swiss*</span>
+  <span class="p">(</span><span class="nv">create-entity</span> <span class="ss">'cheese</span>
+    <span class="ss">:edible/nutrition-value</span> <span class="mi">50</span><span class="p">))</span>
+
+<span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*banana-cream-pie*</span>
+  <span class="p">(</span><span class="nv">create-entity</span> <span class="ss">'pie</span>
+    <span class="ss">:throwable/accuracy</span> <span class="mf">0.3</span>
+    <span class="ss">:throwable/damage</span> <span class="mi">5</span>
+    <span class="ss">:edible/nutrition-value</span> <span class="mi">30</span><span class="p">))</span>
+</pre></div>
+
+
+<p>Beast tries to be just a very thin layer over CLOS, because CLOS is quite
+powerful.  You can use <code>typep</code>, generic methods, before/after/around methods,
+and everything else CLOS gives you.</p>
+<p>Like every engineering decision this comes with tradeoffs.  You can't (easily)
+add or remove aspects to/from a particular entity at runtime like you can with
+cl-ecs.  And there's no way to give an entity multiple "copies" of a single
+aspect.</p>
+<p>The author has found this approach to work well for his needs.  You should take
+a look at both approaches and decide which is best for you.  If you want to read
+more, check out the <a href="../usage/">Usage</a> document.</p>
+                </div>
+            <footer><p><i>Made with Lisp and love by <a href="http://stevelosh.com/">Steve Losh</a> in Reykjavík, Iceland.</i></p>
+<script>
+  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+
+  ga('create', 'UA-15328874-3', 'auto');
+  ga('send', 'pageview');
+
+</script></footer>
+        </div>
+    </body>
+</html>
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cl-digraph/reference-dot/index.html	Sun Nov 06 23:49:33 2016 +0000
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="utf-8"/>
+        <title> cl-dot Support / cl-digraph</title>
+        <link rel="stylesheet" href="../_dmedia/pygments-clean.css"/>
+        <link rel="stylesheet/less" type="text/css" href="../_dmedia/style.less"/>
+        <script src="../_dmedia/less.js" type="text/javascript">
+        </script>
+    </head>
+    <body class="content">
+        <div class="wrap">
+            <header><h1><a href="..">cl-digraph</a></h1></header>
+                <div class="markdown">
+<h1 id="cl-dot-support"><a href="">cl-dot Support</a></h1><p>cl-digraph includes support for drawing digraphs with Graphviz using <code>cl-dot</code>
+  in the <code>cl-digraphs.dot</code> system.</p>
+<div class="toc">
+<ul>
+<li><a href="#package-digraphdot">Package DIGRAPH.DOT</a><ul>
+<li><a href="#draw-function">DRAW (function)</a></li>
+</ul>
+</li>
+</ul></div>
+<h2 id="package-digraphdot">Package <code>DIGRAPH.DOT</code></h2>
+<h3 id="draw-function"><code>DRAW</code> (function)</h3>
+<div class="codehilite"><pre>(DRAW DIGRAPH &amp;KEY (FILENAME digraph.png) (FORMAT :PNG))
+</pre></div>
+
+
+<p>Draw <code>digraph</code> with cl-dot.</p>
+                </div>
+            <footer><p><i>Made with Lisp and love by <a href="http://stevelosh.com/">Steve Losh</a> in Reykjavík, Iceland.</i></p>
+<script>
+  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+
+  ga('create', 'UA-15328874-3', 'auto');
+  ga('send', 'pageview');
+
+</script></footer>
+        </div>
+    </body>
+</html>
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cl-digraph/reference/index.html	Sun Nov 06 23:49:33 2016 +0000
@@ -0,0 +1,283 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="utf-8"/>
+        <title> API Reference / cl-digraph</title>
+        <link rel="stylesheet" href="../_dmedia/pygments-clean.css"/>
+        <link rel="stylesheet/less" type="text/css" href="../_dmedia/style.less"/>
+        <script src="../_dmedia/less.js" type="text/javascript">
+        </script>
+    </head>
+    <body class="content">
+        <div class="wrap">
+            <header><h1><a href="..">cl-digraph</a></h1></header>
+                <div class="markdown">
+<h1 id="api-reference"><a href="">API Reference</a></h1><p>The following is a list of all user-facing parts of cl-digraph.</p>
+<p>If there are backwards-incompatible changes to anything listed here, they will
+be noted in the changelog and the author will feel bad.</p>
+<p>Anything not listed here is subject to change at any time with no warning, so
+don't touch it.</p>
+<div class="toc">
+<ul>
+<li><a href="#package-digraph">Package DIGRAPH</a><ul>
+<li><a href="#contains-edge-p-function">CONTAINS-EDGE-P (function)</a></li>
+<li><a href="#contains-vertex-p-function">CONTAINS-VERTEX-P (function)</a></li>
+<li><a href="#copy-digraph-function">COPY-DIGRAPH (function)</a></li>
+<li><a href="#count-edges-function">COUNT-EDGES (function)</a></li>
+<li><a href="#count-vertices-function">COUNT-VERTICES (function)</a></li>
+<li><a href="#degree-function">DEGREE (function)</a></li>
+<li><a href="#degree-in-function">DEGREE-IN (function)</a></li>
+<li><a href="#degree-out-function">DEGREE-OUT (function)</a></li>
+<li><a href="#digraph-class">DIGRAPH (class)</a></li>
+<li><a href="#edges-function">EDGES (function)</a></li>
+<li><a href="#insert-edge-function">INSERT-EDGE (function)</a></li>
+<li><a href="#insert-vertex-function">INSERT-VERTEX (function)</a></li>
+<li><a href="#make-digraph-function">MAKE-DIGRAPH (function)</a></li>
+<li><a href="#map-breadth-first-function">MAP-BREADTH-FIRST (function)</a></li>
+<li><a href="#map-depth-first-function">MAP-DEPTH-FIRST (function)</a></li>
+<li><a href="#map-edges-function">MAP-EDGES (function)</a></li>
+<li><a href="#map-vertices-function">MAP-VERTICES (function)</a></li>
+<li><a href="#mapc-breadth-first-function">MAPC-BREADTH-FIRST (function)</a></li>
+<li><a href="#mapc-depth-first-function">MAPC-DEPTH-FIRST (function)</a></li>
+<li><a href="#mapc-edges-function">MAPC-EDGES (function)</a></li>
+<li><a href="#mapc-vertices-function">MAPC-VERTICES (function)</a></li>
+<li><a href="#neighbors-function">NEIGHBORS (function)</a></li>
+<li><a href="#predecessors-function">PREDECESSORS (function)</a></li>
+<li><a href="#remove-edge-function">REMOVE-EDGE (function)</a></li>
+<li><a href="#remove-vertex-function">REMOVE-VERTEX (function)</a></li>
+<li><a href="#successors-function">SUCCESSORS (function)</a></li>
+<li><a href="#topological-sort-function">TOPOLOGICAL-SORT (function)</a></li>
+<li><a href="#vertices-function">VERTICES (function)</a></li>
+</ul>
+</li>
+</ul></div>
+<h2 id="package-digraph">Package <code>DIGRAPH</code></h2>
+<h3 id="contains-edge-p-function"><code>CONTAINS-EDGE-P</code> (function)</h3>
+<div class="codehilite"><pre>(CONTAINS-EDGE-P DIGRAPH PREDECESSOR SUCCESSOR)
+</pre></div>
+
+
+<p>Return whether the graph contains an edge from <code>predecessor</code> to <code>successor</code>.</p>
+<h3 id="contains-vertex-p-function"><code>CONTAINS-VERTEX-P</code> (function)</h3>
+<div class="codehilite"><pre>(CONTAINS-VERTEX-P DIGRAPH VERTEX)
+</pre></div>
+
+
+<p>Return whether the graph contains <code>vertex</code>.</p>
+<h3 id="copy-digraph-function"><code>COPY-DIGRAPH</code> (function)</h3>
+<div class="codehilite"><pre>(COPY-DIGRAPH DIGRAPH)
+</pre></div>
+
+
+<p>Create a fresh copy of <code>digraph</code>.</p>
+<p>The vertex objects themselves are not copied, but everything else is.</p>
+<h3 id="count-edges-function"><code>COUNT-EDGES</code> (function)</h3>
+<div class="codehilite"><pre>(COUNT-EDGES DIGRAPH)
+</pre></div>
+
+
+<p>Return the number of edges in <code>digraph</code>.</p>
+<h3 id="count-vertices-function"><code>COUNT-VERTICES</code> (function)</h3>
+<div class="codehilite"><pre>(COUNT-VERTICES DIGRAPH)
+</pre></div>
+
+
+<p>Return the number of vertices in <code>digraph</code>.</p>
+<h3 id="degree-function"><code>DEGREE</code> (function)</h3>
+<div class="codehilite"><pre>(DEGREE DIGRAPH VERTEX)
+</pre></div>
+
+
+<p>Return the number of neighbors of <code>vertex</code>.</p>
+<h3 id="degree-in-function"><code>DEGREE-IN</code> (function)</h3>
+<div class="codehilite"><pre>(DEGREE-IN DIGRAPH VERTEX)
+</pre></div>
+
+
+<p>Return the number of predecessors of <code>vertex</code>.</p>
+<h3 id="degree-out-function"><code>DEGREE-OUT</code> (function)</h3>
+<div class="codehilite"><pre>(DEGREE-OUT DIGRAPH VERTEX)
+</pre></div>
+
+
+<p>Return the number of successors of <code>vertex</code>.</p>
+<h3 id="digraph-class"><code>DIGRAPH</code> (class)</h3>
+<p>A directed graph.  Use <code>make-digraph</code> to create one.</p>
+<h3 id="edges-function"><code>EDGES</code> (function)</h3>
+<div class="codehilite"><pre>(EDGES DIGRAPH)
+</pre></div>
+
+
+<p>Return a fresh list of the edges of <code>digraph</code>.</p>
+<p>Each edge will be a cons of the form <code>(predecessor . successor)</code>.</p>
+<h3 id="insert-edge-function"><code>INSERT-EDGE</code> (function)</h3>
+<div class="codehilite"><pre>(INSERT-EDGE DIGRAPH PREDECESSOR SUCCESSOR)
+</pre></div>
+
+
+<p>Insert an edge from <code>predecessor</code> to <code>successor</code> if not already present.</p>
+<p>The <code>predecessor</code> and <code>successor</code> vertices must exist in the graph already.</p>
+<p>Returns <code>t</code> if the edge was already in the graph, or <code>nil</code> if it was
+  inserted.</p>
+<h3 id="insert-vertex-function"><code>INSERT-VERTEX</code> (function)</h3>
+<div class="codehilite"><pre>(INSERT-VERTEX DIGRAPH VERTEX)
+</pre></div>
+
+
+<p>Insert <code>vertex</code> into the graph if it is not already a member.</p>
+<p>Returns <code>t</code> if the vertex was already in the graph, or <code>nil</code> if it was
+  inserted.</p>
+<h3 id="make-digraph-function"><code>MAKE-DIGRAPH</code> (function)</h3>
+<div class="codehilite"><pre>(MAKE-DIGRAPH &amp;KEY INITIAL-VERTICES (TEST #'EQL) (HASH-FUNCTION NIL))
+</pre></div>
+
+
+<p>Create and return a new digraph.</p>
+<p><code>initial-vertices</code> can be a sequence of vertices to add to the graph.</p>
+<p><code>test</code> should be one of the hash table equality predicates.</p>
+<p>If your Lisp implementation supports the <code>:hash-function</code> argument for
+  creating hash tables with custom predicates, you can specify one with
+  <code>hash-function</code>.</p>
+<h3 id="map-breadth-first-function"><code>MAP-BREADTH-FIRST</code> (function)</h3>
+<div class="codehilite"><pre>(MAP-BREADTH-FIRST FUNCTION DIGRAPH START-VERTEX)
+</pre></div>
+
+
+<p>Apply <code>function</code> to the vertices of a breadth-first traversal of <code>digraph</code>.</p>
+<p>Returns a fresh list with the results.</p>
+<p>Vertices are processed in breadth-first order, beginning at <code>start-vertex</code>,
+  and the resulting list has this order as well.</p>
+<p>Cycles in the graph will not be traversed into.</p>
+<h3 id="map-depth-first-function"><code>MAP-DEPTH-FIRST</code> (function)</h3>
+<div class="codehilite"><pre>(MAP-DEPTH-FIRST FUNCTION DIGRAPH START-VERTEX)
+</pre></div>
+
+
+<p>Apply <code>function</code> to the vertices of a breadth-first traversal of <code>digraph</code>.</p>
+<p>Returns a fresh list with the results.</p>
+<p>Vertices are processed in depth-first order, beginning at <code>start-vertex</code>, and
+  the resulting list has this order as well.</p>
+<p>Cycles in the graph will not be traversed into.</p>
+<h3 id="map-edges-function"><code>MAP-EDGES</code> (function)</h3>
+<div class="codehilite"><pre>(MAP-EDGES FUNCTION DIGRAPH)
+</pre></div>
+
+
+<p>Return a fresh list with the results of calling <code>function</code> on each edge.</p>
+<p>For each edge, <code>function</code> will be called once with two arguments:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="kd">function</span> <span class="nx">predecessor</span> <span class="nx">successor</span><span class="p">)</span>
+</pre></div>
+
+
+<p>The order of the resulting list is unspecified.</p>
+<h3 id="map-vertices-function"><code>MAP-VERTICES</code> (function)</h3>
+<div class="codehilite"><pre>(MAP-VERTICES FUNCTION DIGRAPH)
+</pre></div>
+
+
+<p>Return a fresh list with the results of calling <code>function</code> on each vertex.</p>
+<p>The order of the resulting list is unspecified.</p>
+<h3 id="mapc-breadth-first-function"><code>MAPC-BREADTH-FIRST</code> (function)</h3>
+<div class="codehilite"><pre>(MAPC-BREADTH-FIRST FUNCTION DIGRAPH START-VERTEX)
+</pre></div>
+
+
+<p>Apply <code>function</code> to the vertices of a breadth-first traversal of <code>digraph</code>.</p>
+<p>Returns <code>nil</code>.</p>
+<p>Vertices are processed in breadth-first order, beginning at <code>start-vertex</code>.</p>
+<p>Cycles in the graph will not be traversed into.</p>
+<h3 id="mapc-depth-first-function"><code>MAPC-DEPTH-FIRST</code> (function)</h3>
+<div class="codehilite"><pre>(MAPC-DEPTH-FIRST FUNCTION DIGRAPH START-VERTEX)
+</pre></div>
+
+
+<p>Apply <code>function</code> to the vertices of a depth-first traversal of <code>digraph</code>.</p>
+<p>Returns <code>nil</code>.</p>
+<p>Vertices are processed in depth-first order, beginning at <code>start-vertex</code>.</p>
+<p>Cycles in the graph will not be traversed into.</p>
+<h3 id="mapc-edges-function"><code>MAPC-EDGES</code> (function)</h3>
+<div class="codehilite"><pre>(MAPC-EDGES FUNCTION DIGRAPH)
+</pre></div>
+
+
+<p>Call <code>function</code> on each edge in <code>digraph</code>.</p>
+<p>For each edge, <code>function</code> will be called once with two arguments:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="kd">function</span> <span class="nx">predecessor</span> <span class="nx">successor</span><span class="p">)</span>
+</pre></div>
+
+
+<p>The order in which the edges are processed is unspecified.</p>
+<p>Returns <code>nil</code>.</p>
+<h3 id="mapc-vertices-function"><code>MAPC-VERTICES</code> (function)</h3>
+<div class="codehilite"><pre>(MAPC-VERTICES FUNCTION DIGRAPH)
+</pre></div>
+
+
+<p>Call <code>function</code> on each vertex in <code>digraph</code>.</p>
+<p>The order in which the vertices are processed is unspecified.</p>
+<p>Returns <code>nil</code>.</p>
+<h3 id="neighbors-function"><code>NEIGHBORS</code> (function)</h3>
+<div class="codehilite"><pre>(NEIGHBORS DIGRAPH VERTEX)
+</pre></div>
+
+
+<p>Return a fresh list of the neighbors of <code>vertex</code>.</p>
+<h3 id="predecessors-function"><code>PREDECESSORS</code> (function)</h3>
+<div class="codehilite"><pre>(PREDECESSORS DIGRAPH VERTEX)
+</pre></div>
+
+
+<p>Return a fresh list of the predecessors of <code>vertex</code>.</p>
+<h3 id="remove-edge-function"><code>REMOVE-EDGE</code> (function)</h3>
+<div class="codehilite"><pre>(REMOVE-EDGE DIGRAPH PREDECESSOR SUCCESSOR)
+</pre></div>
+
+
+<p>Remove an edge from <code>predecessor</code> to <code>successor</code> if present.</p>
+<p>Returns <code>t</code> if there was such an edge, or <code>nil</code> if not.</p>
+<h3 id="remove-vertex-function"><code>REMOVE-VERTEX</code> (function)</h3>
+<div class="codehilite"><pre>(REMOVE-VERTEX DIGRAPH VERTEX)
+</pre></div>
+
+
+<p>Remove <code>vertex</code> from the graph if present.</p>
+<p>If there are any edges to/from <code>vertex</code> they will be automatically removed.</p>
+<p>Returns <code>t</code> if there was such a vertex, or <code>nil</code> if not.</p>
+<h3 id="successors-function"><code>SUCCESSORS</code> (function)</h3>
+<div class="codehilite"><pre>(SUCCESSORS DIGRAPH VERTEX)
+</pre></div>
+
+
+<p>Return a fresh list of the successors of <code>vertex</code>.</p>
+<h3 id="topological-sort-function"><code>TOPOLOGICAL-SORT</code> (function)</h3>
+<div class="codehilite"><pre>(TOPOLOGICAL-SORT DIGRAPH)
+</pre></div>
+
+
+<p>Return a fresh list of the vertices of <code>digraph</code> in topological order.</p>
+<p>Edges are treated as meaning "depends on", so an edge <code>A --&gt; B</code> means "A
+  depends on B" and that B must come before A in the resulting list.  Aside
+  from this restriction, the order of the resulting list is arbitrary.</p>
+<p>The order in which the vertices are processed is unspecified.</p>
+<p>An error will be signaled if the graph contains a cycle.</p>
+<h3 id="vertices-function"><code>VERTICES</code> (function)</h3>
+<div class="codehilite"><pre>(VERTICES DIGRAPH)
+</pre></div>
+
+
+<p>Return a fresh list of the vertices of <code>digraph</code>.</p>
+                </div>
+            <footer><p><i>Made with Lisp and love by <a href="http://stevelosh.com/">Steve Losh</a> in Reykjavík, Iceland.</i></p>
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@@ -0,0 +1,354 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="utf-8"/>
+        <title>Usage / cl-digraph</title>
+        <link rel="stylesheet" href="../_dmedia/pygments-clean.css"/>
+        <link rel="stylesheet/less" type="text/css" href="../_dmedia/style.less"/>
+        <script src="../_dmedia/less.js" type="text/javascript">
+        </script>
+    </head>
+    <body class="content">
+        <div class="wrap">
+            <header><h1><a href="..">cl-digraph</a></h1></header>
+                <div class="markdown">
+<h1 id="usage"><a href="">Usage</a></h1><p>cl-digraph is a simple library for working with <a href="https://en.wikipedia.org/wiki/Directed_graph">directed graphs</a> in Common
+Lisp.</p>
+<div class="toc">
+<ul>
+<li><a href="#package">Package</a></li>
+<li><a href="#creating-digraphs">Creating Digraphs</a></li>
+<li><a href="#working-with-vertices">Working with Vertices</a></li>
+<li><a href="#equality">Equality</a></li>
+<li><a href="#working-with-edges">Working with Edges</a></li>
+<li><a href="#retrieving-digraph-information">Retrieving Digraph Information</a><ul>
+<li><a href="#vertices-and-edges">Vertices and Edges</a></li>
+<li><a href="#neighboring-vertices">Neighboring Vertices</a></li>
+<li><a href="#membership">Membership</a></li>
+<li><a href="#sizes-and-counts">Sizes and Counts</a></li>
+</ul>
+</li>
+<li><a href="#mapping-traversal-and-sorting">Mapping, Traversal, and Sorting</a><ul>
+<li><a href="#unordered-mapping">Unordered Mapping</a></li>
+<li><a href="#ordered-traversal">Ordered Traversal</a></li>
+<li><a href="#topological-sorting">Topological Sorting</a></li>
+</ul>
+</li>
+</ul></div>
+<h2 id="package">Package</h2>
+<p>All core cl-digraph functions are in the <code>digraph</code> package.  You can <code>:use</code> that
+if you really want to, but it's probably clearer to use namespaced <code>digraph:...</code>
+symbols.</p>
+<h2 id="creating-digraphs">Creating Digraphs</h2>
+<p>Digraphs can be created with <code>make-digraph</code>:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nv">digraph:make-digraph</span><span class="p">)</span>
+<span class="c1">; =&gt;</span>
+<span class="err">#</span><span class="nv">&lt;DIGRAPH:DIGRAPH</span> <span class="p">()</span> <span class="nv">{1002CFD343}&gt;</span>
+</pre></div>
+
+
+<h2 id="working-with-vertices">Working with Vertices</h2>
+<p>Vertices can be added to a digraph with <code>insert-vertex</code>, and a list of all
+vertices in the graph retrieved with <code>vertices</code>:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*d*</span> <span class="p">(</span><span class="nv">digraph:make-digraph</span><span class="p">))</span>
+
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; ()</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-vertex</span> <span class="vg">*d*</span> <span class="ss">'foo</span><span class="p">)</span>
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; (foo)</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-vertex</span> <span class="vg">*d*</span> <span class="ss">'bar</span><span class="p">)</span>
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; (bar foo)</span>
+</pre></div>
+
+
+<p>The order of vertices returned in the list is arbitrary.  We'll see how to
+retrieve vertices in specific orders later.</p>
+<p>Duplicate vertices are silently ignored:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*d*</span> <span class="p">(</span><span class="nv">digraph:make-digraph</span><span class="p">))</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-vertex</span> <span class="vg">*d*</span> <span class="ss">'foo</span><span class="p">)</span>
+<span class="p">(</span><span class="nv">digraph:insert-vertex</span> <span class="vg">*d*</span> <span class="ss">'foo</span><span class="p">)</span>
+<span class="p">(</span><span class="nv">digraph:insert-vertex</span> <span class="vg">*d*</span> <span class="ss">'foo</span><span class="p">)</span>
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; (foo)</span>
+</pre></div>
+
+
+<p>You can also specify some initial vertices directly in the <code>make-digraph</code> call
+if you want:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*d*</span>
+  <span class="p">(</span><span class="nv">digraph:make-digraph</span> <span class="ss">:initial-vertices</span> <span class="o">'</span><span class="p">(</span><span class="nv">a</span> <span class="nv">b</span> <span class="nv">c</span><span class="p">)))</span>
+
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; (a c b)</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-vertex</span> <span class="vg">*d*</span> <span class="ss">'foo</span><span class="p">)</span>
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; (a c foo b)</span>
+</pre></div>
+
+
+<p>You can remove vertices with <code>remove-vertex</code>.  Removing a vertex that's not in
+the graph is silently ignored:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*d*</span>
+  <span class="p">(</span><span class="nv">digraph:make-digraph</span> <span class="ss">:initial-vertices</span> <span class="o">'</span><span class="p">(</span><span class="nv">a</span> <span class="nv">b</span> <span class="nv">c</span><span class="p">)))</span>
+
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; (a c b)</span>
+
+<span class="p">(</span><span class="nv">digraph:remove-vertex</span> <span class="vg">*d*</span> <span class="ss">'a</span><span class="p">)</span>
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; (c b)</span>
+
+<span class="p">(</span><span class="nv">digraph:remove-vertex</span> <span class="vg">*d*</span> <span class="ss">'cats</span><span class="p">)</span>
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; (c b)</span>
+</pre></div>
+
+
+<h2 id="equality">Equality</h2>
+<p>By default cl-digraph compares vertices for equality with <code>eql</code>.  You can
+specify a different equality predicate with the <code>:test</code> argument to
+<code>make-digraph</code>:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*d*</span>
+  <span class="p">(</span><span class="nv">digraph:make-digraph</span> <span class="ss">:test</span> <span class="nf">#'</span><span class="nb">equal</span><span class="p">))</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-vertex</span> <span class="vg">*d*</span> <span class="p">(</span><span class="nb">list</span> <span class="mi">1</span> <span class="mi">2</span><span class="p">))</span>
+<span class="p">(</span><span class="nv">digraph:insert-vertex</span> <span class="vg">*d*</span> <span class="p">(</span><span class="nb">list</span> <span class="mi">3</span> <span class="mi">4</span><span class="p">))</span>
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; ((1 2) (3 4))</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-vertex</span> <span class="vg">*d*</span> <span class="p">(</span><span class="nb">list</span> <span class="mi">1</span> <span class="mi">2</span><span class="p">))</span>
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; ((1 2) (3 4))</span>
+
+<span class="p">(</span><span class="nv">digraph:remove-vertex</span> <span class="vg">*d*</span> <span class="p">(</span><span class="nb">list</span> <span class="mi">1</span> <span class="mi">2</span><span class="p">))</span>
+<span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; ((3 4))</span>
+</pre></div>
+
+
+<p>cl-digraph stores data in hash tables internally, so <code>test</code> must be one of the
+predicates supported as a hash table test (<code>eq</code>, <code>eql</code>, <code>equal</code>, or <code>equalp</code>).</p>
+<p>If your Lisp implementation supports creating hash tables with custom hash
+functions with the <code>:hash-function</code> argument to <code>make-hash-table</code>, you can use
+them with cl-digraph as well:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*d*</span>
+  <span class="p">(</span><span class="nv">digraph:make-digraph</span> <span class="ss">:test</span> <span class="nf">#'</span><span class="nv">some-predicate</span>
+                        <span class="ss">:hash-function</span> <span class="nf">#'</span><span class="nv">custom-hash-function</span><span class="p">))</span>
+</pre></div>
+
+
+<p>This should work in SBCL, LispWorks, Allegro, CCL, and possibly others.</p>
+<h2 id="working-with-edges">Working with Edges</h2>
+<p>Once you've got some vertices in a digraph you can add edges between them.  The
+vertex that an edge goes <em>out of</em> is called the <strong>predecessor</strong>, and the vertex
+the edge goes <em>into</em> is called the <strong>successor</strong>:</p>
+<div class="codehilite"><pre>┌─────────────┐      ┌─────────────┐
+│ predecessor │─────▶│  successor  │
+└─────────────┘      └─────────────┘
+</pre></div>
+
+
+<p>Edges are added with <code>insert-edge</code>.  A list of edges in a digraph can be
+retrieved with <code>edges</code>:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*d*</span>
+  <span class="p">(</span><span class="nv">digraph:make-digraph</span> <span class="ss">:initial-vertices</span> <span class="o">'</span><span class="p">(</span><span class="nv">a</span> <span class="nv">b</span> <span class="nv">c</span><span class="p">)))</span>
+
+<span class="p">(</span><span class="nv">digraph:edges</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; ()</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-edge</span> <span class="vg">*d*</span> <span class="ss">'a</span> <span class="ss">'b</span><span class="p">)</span> <span class="c1">; a -&gt; b</span>
+<span class="p">(</span><span class="nv">digraph:edges</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; ((a . b))</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-edge</span> <span class="vg">*d*</span> <span class="ss">'b</span> <span class="ss">'c</span><span class="p">)</span> <span class="c1">; b -&gt; c</span>
+<span class="p">(</span><span class="nv">digraph:edges</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; ((b . c) (a . b))</span>
+</pre></div>
+
+
+<p>Duplicate edges are silently ignored.  The predecessor and successor must both
+exist in the graph already, or an error will be signaled:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*d*</span>
+  <span class="p">(</span><span class="nv">digraph:make-digraph</span> <span class="ss">:initial-vertices</span> <span class="o">'</span><span class="p">(</span><span class="nv">a</span> <span class="nv">b</span> <span class="nv">c</span><span class="p">)))</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-edge</span> <span class="vg">*d*</span> <span class="ss">'a</span> <span class="ss">'b</span><span class="p">)</span> <span class="c1">; a -&gt; b</span>
+<span class="p">(</span><span class="nv">digraph:insert-edge</span> <span class="vg">*d*</span> <span class="ss">'a</span> <span class="ss">'b</span><span class="p">)</span> <span class="c1">; ignored</span>
+<span class="p">(</span><span class="nv">digraph:insert-edge</span> <span class="vg">*d*</span> <span class="ss">'a</span> <span class="ss">'b</span><span class="p">)</span> <span class="c1">; ignored</span>
+<span class="p">(</span><span class="nv">digraph:edges</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; ((a . b))</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-edge</span> <span class="vg">*d*</span> <span class="ss">'cats</span> <span class="ss">'dogs</span><span class="p">)</span>
+<span class="c1">; =&gt; Error!</span>
+</pre></div>
+
+
+<p>Edges can be removed with <code>remove-edge</code>.  Removing an edge that's not in the
+graph is silently ignored:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*d*</span>
+  <span class="p">(</span><span class="nv">digraph:make-digraph</span> <span class="ss">:initial-vertices</span> <span class="o">'</span><span class="p">(</span><span class="nv">a</span> <span class="nv">b</span> <span class="nv">c</span><span class="p">)))</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-edge</span> <span class="vg">*d*</span> <span class="ss">'a</span> <span class="ss">'b</span><span class="p">)</span> <span class="c1">; a -&gt; b</span>
+<span class="p">(</span><span class="nv">digraph:edges</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; ((a . b))</span>
+
+<span class="p">(</span><span class="nv">digraph:remove-edge</span> <span class="vg">*d*</span> <span class="ss">'a</span> <span class="ss">'b</span><span class="p">)</span> <span class="c1">; removes a -&gt; b</span>
+<span class="p">(</span><span class="nv">digraph:remove-edge</span> <span class="vg">*d*</span> <span class="ss">'a</span> <span class="ss">'b</span><span class="p">)</span> <span class="c1">; ignored</span>
+<span class="p">(</span><span class="nv">digraph:edges</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; ()</span>
+</pre></div>
+
+
+<h2 id="retrieving-digraph-information">Retrieving Digraph Information</h2>
+<p>Once you've got a digraph you might want to ask it about itself.  Let's consider
+a simple digraph as an example:</p>
+<div class="codehilite"><pre><span class="c1">;            ┌───┐      ┌───┐</span>
+<span class="c1">;   ┌───────▶│ B │─────▶│ D │</span>
+<span class="c1">;   │        └───┘      └───┘</span>
+<span class="c1">; ┌───┐</span>
+<span class="c1">; │ A │               ┌─────┐       ┌─────┐</span>
+<span class="c1">; └───┘               │ FOO │──────▶│ BAR │──┐</span>
+<span class="c1">;   │        ┌───┐    └─────┘       └─────┘  │</span>
+<span class="c1">;   └───────▶│ C │                     ▲     │</span>
+<span class="c1">;            └───┘                     │     │</span>
+<span class="c1">;                                      └─────┘</span>
+<span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*d*</span>
+  <span class="p">(</span><span class="nv">digraph:make-digraph</span> <span class="ss">:initial-vertices</span> <span class="o">'</span><span class="p">(</span><span class="nv">a</span> <span class="nv">b</span> <span class="nv">c</span> <span class="nv">d</span> <span class="nv">foo</span> <span class="nv">bar</span><span class="p">)))</span>
+
+<span class="p">(</span><span class="nb">loop</span> <span class="ss">:for</span> <span class="p">(</span><span class="nv">from</span> <span class="nv">to</span><span class="p">)</span> <span class="ss">:in</span> <span class="o">'</span><span class="p">((</span><span class="nv">a</span> <span class="nv">b</span><span class="p">)</span> <span class="p">(</span><span class="nv">a</span> <span class="nv">c</span><span class="p">)</span> <span class="p">(</span><span class="nv">b</span> <span class="nv">d</span><span class="p">)</span> <span class="p">(</span><span class="nv">foo</span> <span class="nv">bar</span><span class="p">)</span> <span class="p">(</span><span class="nv">bar</span> <span class="nv">bar</span><span class="p">))</span>
+      <span class="ss">:do</span> <span class="p">(</span><span class="nv">digraph:insert-edge</span> <span class="vg">*d*</span> <span class="nv">from</span> <span class="nv">to</span><span class="p">))</span>
+</pre></div>
+
+
+<p>Notice that digraphs don't have to be connected, and vertices can have edges to
+themselves.</p>
+<h3 id="vertices-and-edges">Vertices and Edges</h3>
+<p>We've already seen <code>vertices</code> and <code>edges</code>:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nv">digraph:vertices</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; (BAR FOO D C B A)</span>
+
+<span class="p">(</span><span class="nv">digraph:edges</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; ((BAR . BAR) (FOO . BAR) (B . D) (A . B) (A . C))</span>
+</pre></div>
+
+
+<p>These functions return their results in an arbitrary order — don't rely on it
+being anything in particular.</p>
+<h3 id="neighboring-vertices">Neighboring Vertices</h3>
+<p>The <code>predecessors</code> and <code>successors</code> functions return a list of vertices with
+edges to/from a particular vertex:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nv">digraph:predecessors</span> <span class="vg">*d*</span> <span class="ss">'a</span><span class="p">)</span> <span class="c1">; =&gt; ()</span>
+<span class="p">(</span><span class="nv">digraph:successors</span> <span class="vg">*d*</span> <span class="ss">'a</span><span class="p">)</span>   <span class="c1">; =&gt; (b c)</span>
+
+<span class="p">(</span><span class="nv">digraph:predecessors</span> <span class="vg">*d*</span> <span class="ss">'bar</span><span class="p">)</span> <span class="c1">; =&gt; (foo bar)</span>
+<span class="p">(</span><span class="nv">digraph:successors</span> <span class="vg">*d*</span>   <span class="ss">'bar</span><span class="p">)</span> <span class="c1">; =&gt; (bar)</span>
+</pre></div>
+
+
+<p><code>neighbors</code> returns all vertices that are a predecessor <em>or</em> successor of the
+given vertex:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nv">digraph:neighbors</span> <span class="vg">*d*</span> <span class="ss">'b</span><span class="p">)</span> <span class="c1">; =&gt; (a d)</span>
+</pre></div>
+
+
+<h3 id="membership">Membership</h3>
+<p>To check whether a digraph contains a particular edge or vertex use
+<code>contains-vertex-p</code> and <code>contains-edge-p</code>:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nv">digraph:contains-vertex-p</span> <span class="vg">*d*</span> <span class="ss">'a</span><span class="p">)</span>      <span class="c1">; =&gt; t</span>
+<span class="p">(</span><span class="nv">digraph:contains-vertex-p</span> <span class="vg">*d*</span> <span class="ss">'horses</span><span class="p">)</span> <span class="c1">; =&gt; nil</span>
+
+<span class="p">(</span><span class="nv">digraph:contains-edge-p</span> <span class="vg">*d*</span> <span class="ss">'a</span> <span class="ss">'b</span><span class="p">)</span>     <span class="c1">; =&gt; t</span>
+<span class="p">(</span><span class="nv">digraph:contains-edge-p</span> <span class="vg">*d*</span> <span class="ss">'a</span> <span class="ss">'foo</span><span class="p">)</span>   <span class="c1">; =&gt; nil</span>
+</pre></div>
+
+
+<h3 id="sizes-and-counts">Sizes and Counts</h3>
+<p>If you just want the <em>number</em> of vertices or edges in a digraph and don't need
+a list of them, use <code>count-vertices</code> and <code>count-edges</code>:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nv">digraph:count-vertices</span> <span class="vg">*d*</span><span class="p">)</span> <span class="c1">; =&gt; 6</span>
+<span class="p">(</span><span class="nv">digraph:count-edges</span> <span class="vg">*d*</span><span class="p">)</span>    <span class="c1">; =&gt; 5</span>
+</pre></div>
+
+
+<p>Similarly, if you want to know the number of edges into/out of/involving
+a vertex use <code>degree</code>, <code>degree-in</code>, and <code>degree-out</code>:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nv">digraph:predecessors</span> <span class="vg">*d*</span> <span class="ss">'a</span><span class="p">)</span> <span class="c1">; =&gt; ()</span>
+<span class="p">(</span><span class="nv">digraph:degree-in</span>    <span class="vg">*d*</span> <span class="ss">'a</span><span class="p">)</span> <span class="c1">; = 0</span>
+
+<span class="p">(</span><span class="nv">digraph:successors</span> <span class="vg">*d*</span> <span class="ss">'bar</span><span class="p">)</span> <span class="c1">; =&gt; (bar)</span>
+<span class="p">(</span><span class="nv">digraph:degree-out</span> <span class="vg">*d*</span> <span class="ss">'bar</span><span class="p">)</span> <span class="c1">; =&gt; 1</span>
+
+<span class="p">(</span><span class="nv">digraph:neighbors</span>  <span class="vg">*d*</span> <span class="ss">'b</span><span class="p">)</span> <span class="c1">; =&gt; (a d)</span>
+<span class="p">(</span><span class="nv">digraph:degree-out</span> <span class="vg">*d*</span> <span class="ss">'b</span><span class="p">)</span> <span class="c1">; =&gt; 2</span>
+</pre></div>
+
+
+<h2 id="mapping-traversal-and-sorting">Mapping, Traversal, and Sorting</h2>
+<p>Sometimes you may want to perform an action on each vertex or edge in a directed
+graph, possibly in a specific order.</p>
+<h3 id="unordered-mapping">Unordered Mapping</h3>
+<p>If you don't care about the order the items are processed/returned in, use one
+of the unordered mapping functions:</p>
+<ul>
+<li><code>(digraph:mapc-vertices function digraph)</code></li>
+<li><code>(digraph:mapc-edges function digraph)</code></li>
+<li><code>(digraph:map-vertices function digraph)</code></li>
+<li><code>(digraph:map-edges function digraph)</code></li>
+</ul>
+<p>The <code>map-</code> variants return a fresh list of the results of calling <code>function</code> on
+the argument(s).</p>
+<p>The <code>mapc-</code> variants return <code>nil</code>, so you'd want to use them for the side
+effects of <code>function</code>.</p>
+<p>The <code>-vertices</code> variants call <code>function</code> with a single argument: the vertex.</p>
+<p>The <code>-edges</code> variants call <code>function</code> with two arguments: the predecessor and
+successor.</p>
+<h3 id="ordered-traversal">Ordered Traversal</h3>
+<p>Sometimes you may want to traverse the vertices of a digraph in depth-first or
+breadth-first order.  You can use the ordered mapping functions for this:</p>
+<ul>
+<li><code>(digraph:mapc-depth-first function digraph start-vertex)</code></li>
+<li><code>(digraph:mapc-breadth-first function digraph start-vertex)</code></li>
+<li><code>(digraph:map-depth-first function digraph start-vertex)</code></li>
+<li><code>(digraph:map-breadth-first function digraph start-vertex)</code></li>
+</ul>
+<p>If a traversal contains a cycle the traversal will stop that line of traversing
+instead of looping infinitely.</p>
+<h3 id="topological-sorting">Topological Sorting</h3>
+<p>One common use of (acyclic) digraphs is to represent graphs of dependencies,
+e.g. library <code>foo</code> depends on library <code>bar</code>, and <code>bar</code> depends on <code>baz</code>.</p>
+<p>Often the end goal of constructing such a graph is to produce a <a href="https://en.wikipedia.org/wiki/Topological_sorting">topologically
+sorted</a> list of the vertices — a list where each vertex comes after the ones
+it depends on.  cl-digraph can produce a list in this order with the
+<code>topological-sort</code> function:</p>
+<div class="codehilite"><pre><span class="p">(</span><span class="nb">defparameter</span> <span class="vg">*d*</span>
+  <span class="p">(</span><span class="nv">digraph:make-digraph</span> <span class="ss">:initial-vertices</span> <span class="o">'</span><span class="p">(</span><span class="nv">a</span> <span class="nv">b</span> <span class="nv">c</span> <span class="nv">d</span><span class="p">)))</span>
+
+<span class="p">(</span><span class="nv">digraph:insert-edge</span> <span class="vg">*d*</span> <span class="ss">'a</span> <span class="ss">'b</span><span class="p">)</span> <span class="c1">; a depends on b</span>
+<span class="p">(</span><span class="nv">digraph:insert-edge</span> <span class="vg">*d*</span> <span class="ss">'a</span> <span class="ss">'c</span><span class="p">)</span> <span class="c1">; a depends on c</span>
+<span class="p">(</span><span class="nv">digraph:insert-edge</span> <span class="vg">*d*</span> <span class="ss">'d</span> <span class="ss">'a</span><span class="p">)</span> <span class="c1">; d depends on a</span>
+
+<span class="p">(</span><span class="nv">digraph:topological-sort</span> <span class="vg">*d*</span><span class="p">)</span>
+<span class="c1">; =&gt; one of</span>
+<span class="p">(</span><span class="nv">C</span> <span class="nv">B</span> <span class="nv">A</span> <span class="nv">D</span><span class="p">)</span>
+<span class="p">(</span><span class="nv">B</span> <span class="nv">C</span> <span class="nv">A</span> <span class="nv">D</span><span class="p">)</span>
+</pre></div>
+                </div>
+            <footer><p><i>Made with Lisp and love by <a href="http://stevelosh.com/">Steve Losh</a> in Reykjavík, Iceland.</i></p>
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