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author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 10 May 2020 23:28:16 -0600
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1 <!doctype html>
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2 <html>
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3 <head>
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4 <title>Luan Tutorial</title>
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5 <style>
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6 @import "site.css";
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7 </style>
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8 </head>
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9 <body>
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11 <div small>
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12 <a href=".">Luan</a>
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13 / <a href="docs.html">Documentation</a>
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14 </div>
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15
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16 <h1>Luan Tutorial</h1>
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18
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19 <p>Create a file <b>hello.luan</b> containing:</p>
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21 <pre>
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22 %>
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23 Hello World
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24 <%
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25 </pre>
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27 <p>To run this, type <b>luan hello.luan</b> on the command line. This should print <b>Hello World</b>.</p>
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29 <p>The syntax here is based on <a href="http://en.wikipedia.org/wiki/JavaServer_Pages">JSP</a>. Let's change it a little:</p>
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31 <pre>
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32 local name = "Bob"
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33 %>
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34 Hello <%= name %>
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35 <%
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36 </pre>
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38 <p>This should print <b>Hello Bob</b>. Now let's try a more conventional approach:</p>
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39
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40 <pre>
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41 local Io = require "luan:Io.luan"
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42 local print = Io.print
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43
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44 print("Hello World")
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45 </pre>
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47 <p>In Luan, a function call with one string argument doesn't require parenthesis, so <b>print("Hello World")</b> is the same as <b>print "Hello World"</b> and <b>require "luan:Io.luan"</b> is the same as <b>require("luan:Io.luan")</b>. Both <b>require</b> and <b>print</b> are functions.</p>
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49 <p>The <b>require</b> function takes a <a href="http://en.wikipedia.org/wiki/Uniform_resource_identifier">URI</a> as an argument. Examples of URIs are "<b>luan:Io.luan</b>" and "<b>file:hello.luan</b>". <b>require</b> is used to import a module, which is returned from the <b>require</b> function call. In the case above, we assign the module to the local variable <b>Io</b>. The function <b>print</b> is a member of this module. We could have done <b>Io.print("Hello World")</b> but instead we chose to assign <b>print</b> to a local variable and use that to call the function.</p>
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51 <p>Luan starts with only two defined functions: <b>require</b> and <b>java</b>. You will use <b>require</b> to import whatever you need. This is a little more work, but makes it clear in each file where each function comes from.</p>
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52
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53 <p>Let's a make fancier version:</p>
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54
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55 <pre>
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56 local Io = require "luan:Io.luan"
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57 local print = Io.print
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58
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59 local function hello(name)
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60 print("Hello "..name)
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61 end
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63 hello("Bob")
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64 </pre>
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66 <p>The <b>..</b> operator does concatenation. This will print <b>Hello Bob</b>.</p>
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68 <p>Now let's make a web page. First we need a directory for our website. So create a directory <b>site</b>. In this directory, create a file <b>hi.html.luan</b> containing:
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70 <pre>
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71 local Io = require "luan:Io.luan"
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72 local Http = require "luan:http/Http.luan"
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74 return function()
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75 Io.stdout = Http.response.text_writer()
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76 %>
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77 &lt;!doctype html>
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78 &lt;html>
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79 &lt;body>
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80 Hello World
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81 &lt;/body>
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82 &lt;/html>
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83 <%
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84 end
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85 </pre>
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86
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87 <p>Now go back to the parent directory and do <b>luan luan:http/serve.luan file:site</b>. This will run the Luan web server on port 8080. Try going to <a href="http://localhost:8080/">http://localhost:8080/</a>. You should see the directory. If you click on <b>hi.html.luan</b> you will see the source. But if you remove the <b>.luan</b> and just go to <a href="http://localhost:8080/hi.html">http://localhost:8080/hi.html</a> then you will run the program which will generate the web page.</p>
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89 <p>The Luan webserver expects the file to return a function and calls it to generate the page. Code of the form <b>%>...<%</b> writes its output to <b>Io.stdout</b> which by default is the standard output of the command line. So in the returned function one usually starts by setting <b>Io.stdout</b> to a <code>text_writer</code> which writes its output to the HTTP response (to the web browser).</p>
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91 <p>You can find this example and others in the <a href="examples/">examples directory</a>. Take a look at <a href="examples/hi2.luan">hi2.luan</a> next. Remember to remove the <b>.luan</b> from the URL to run the code.</p>
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93 <p>So now you have built your website and you want to publish it to the web. If you have your own domain, create a CNAME record for it pointing to <b>s1.luan.ws</b>. If you don't have a domain, just use a domain like <b>bob.s1.luan.ws</b> (anything of the form <b>*.s1.luan.ws</b>). Assuming your directory is <b>site</b> and you will use the password <b>secret</b>, do the following from the command line:
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95 <pre>
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96 luan luan:host/push.luan bob.s1.luan.ws secret site
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97 </pre>
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99 <p>The form is <b>luan luan:host/push.luan domain password directory</b>. If you change your site, just run this again and your site will be updated. To delete your site, do <b>luan luan:host/delete.luan domain password</b>.</p>
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101 <p>Hopefully this short tutorial gave you an idea of how to use Luan to make a website.</p>
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102
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103 </body>
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104 </html>