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annotate website/src/tutorial.html.luan @ 635:c83b8cefd922
better error handling in theme code
| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Tue, 01 Mar 2016 07:01:58 -0700 |
| parents | 7cc9d4a53d3b |
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| rev | line source |
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| 382 | 1 local Io = require "luan:Io" |
| 2 local Html = require "luan:Html" | |
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3 local Http = require "luan:http/Http" |
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4 local Shared = require "site:/Shared" |
| 382 | 5 |
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6 |
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7 return function() |
| 382 | 8 Io.stdout = Http.response.text_writer() |
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9 %> |
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10 <html> |
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11 <head> |
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12 <title>Luan Tutorial</title> |
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13 <style> |
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14 @import "/site.css"; |
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15 </style> |
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16 </head> |
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17 <body> |
| 382 | 18 |
| 19 <div container> | |
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20 <% Shared.header() %> |
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21 <h1>Luan Tutorial</h1> |
| 382 | 22 |
| 23 | |
| 24 <p>Create a file <b>hello.luan</b> containing:</p> | |
| 25 | |
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26 <pre><%=Html.encode[[ |
| 382 | 27 %> |
| 28 Hello World | |
| 29 <% | |
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30 ]]%></pre> |
| 382 | 31 |
| 32 <p>To run this, type <b>luan file:hello</b> on the command line. This should print <b>Hello World</b>.</p> | |
| 33 | |
| 34 <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> | |
| 35 | |
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36 <pre><%=Html.encode[[ |
| 382 | 37 name = "Bob" |
| 38 %> | |
| 39 Hello <%= name %> | |
| 40 <% | |
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41 ]]%></pre> |
| 382 | 42 |
| 43 <p>This should print <b>Hello Bob</b>. Now let's try a more conventional approach:</p> | |
| 44 | |
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45 <pre> |
| 382 | 46 local Io = require "luan:Io" |
| 47 local print = Io.print | |
| 48 | |
| 49 print("Hello World") | |
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50 </pre> |
| 382 | 51 |
| 52 <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"</b> is the same as <b>require("luan:Io")</b>. Both <b>require</b> and <b>print</b> are functions.</p> | |
| 53 | |
| 54 <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</b>" and "<b>file:hello</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> | |
| 55 | |
| 56 <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> | |
| 57 | |
| 58 <p>Let's a make fancier version:</p> | |
| 59 | |
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60 <pre> |
| 382 | 61 local Io = require "luan:Io" |
| 62 local print = Io.print | |
| 63 | |
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64 local function hello(name) |
| 382 | 65 print("Hello "..name) |
| 66 end | |
| 67 | |
| 68 hello("Bob") | |
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69 </pre> |
| 382 | 70 |
| 71 <p>The <b>..</b> operator does concatenation. This will print <b>Hello Bob</b>.</p> | |
| 72 | |
| 73 <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.luan</b> containing: | |
| 74 | |
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75 <pre><%=Html.encode[[ |
| 382 | 76 local Io = require "luan:Io" |
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77 local Http = require "luan:http/Http" |
| 382 | 78 |
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79 return function() |
| 382 | 80 Io.stdout = Http.response.text_writer() |
| 81 %> | |
| 82 <html> | |
| 83 <body> | |
| 84 Hello World | |
| 85 </body> | |
| 86 </html> | |
| 87 <% | |
| 88 end | |
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89 ]]%></pre> |
| 382 | 90 |
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91 <p>Now go back to the parent directory and do <b>luan luan:http/serve 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.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">http://localhost:8080/hi</a> then you will run the program which will generate the web page.</p> |
| 382 | 92 |
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93 <p>The Luan webserver expects the file to return a function and calls it to generate the page. Code of the form <b><%=Html.encode[[%>...<%]]%></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> |
| 382 | 94 |
| 95 <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. And by the way, you can see the source for this page at <a href="tutorial.html.luan">tutorial.html.luan</a>.</p> | |
| 96 | |
| 401 | 97 <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.luanhost.com</b>. If you don't have a domain, just use a domain like <b>bob.s1.luanhost.com</b> (anything of the form <b>*.s1.luanhost.com</b>). Assuming your directory is <b>site</b> and you will use the password <b>secret</b>, do the following from the command line: |
| 382 | 98 |
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99 <pre> |
| 382 | 100 luan luan:host/push bob.s1.luanhost.com secret site |
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101 </pre> |
| 382 | 102 |
| 103 <p>The form is <b>luan luan:host/push 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 domain password</b>.</p> | |
| 104 | |
| 105 <p>Hopefully this short tutorial gave you an idea of how to use Luan to make a website.</p> | |
| 106 | |
| 107 </div> | |
| 108 | |
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109 </body> |
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110 </html> |
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111 <% |
| 382 | 112 end |