Mercurial Hosting > luan
annotate website/src/tutorial.html.luan @ 1283:503bde9a7c80
add luan.require() and table.call()
| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Fri, 21 Dec 2018 09:12:09 -0700 |
| parents | 4c2972f4d862 |
| children | 5684a14582c4 |
| rev | line source |
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module URIs must now include ".luan"
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1 local Io = require "luan:Io.luan" |
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2 local Html = require "luan:Html.luan" |
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3 local Http = require "luan:http/Http.luan" |
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4 local Shared = require "site:/Shared.luan" |
| 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 %> |
| 1216 | 10 <!doctype html> |
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11 <html> |
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12 <head> |
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13 <title>Luan Tutorial</title> |
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14 <style> |
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15 @import "/site.css"; |
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16 </style> |
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17 </head> |
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18 <body> |
| 382 | 19 |
| 20 <div container> | |
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21 <% Shared.header() %> |
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22 <h1>Luan Tutorial</h1> |
| 382 | 23 |
| 24 | |
| 25 <p>Create a file <b>hello.luan</b> containing:</p> | |
| 26 | |
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27 <pre><%=Html.encode[[ |
| 382 | 28 %> |
| 29 Hello World | |
| 30 <% | |
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31 ]]%></pre> |
| 382 | 32 |
| 1045 | 33 <p>To run this, type <b>luan hello.luan</b> on the command line. This should print <b>Hello World</b>.</p> |
| 382 | 34 |
| 35 <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> | |
| 36 | |
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37 <pre><%=Html.encode[[ |
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38 local name = "Bob" |
| 382 | 39 %> |
| 40 Hello <%= name %> | |
| 41 <% | |
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42 ]]%></pre> |
| 382 | 43 |
| 44 <p>This should print <b>Hello Bob</b>. Now let's try a more conventional approach:</p> | |
| 45 | |
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46 <pre> |
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47 local Io = require "luan:Io.luan" |
| 382 | 48 local print = Io.print |
| 49 | |
| 50 print("Hello World") | |
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51 </pre> |
| 382 | 52 |
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parents:
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53 <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> |
| 382 | 54 |
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parents:
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55 <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> |
| 382 | 56 |
| 57 <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> | |
| 58 | |
| 59 <p>Let's a make fancier version:</p> | |
| 60 | |
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61 <pre> |
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module URIs must now include ".luan"
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62 local Io = require "luan:Io.luan" |
| 382 | 63 local print = Io.print |
| 64 | |
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65 local function hello(name) |
| 382 | 66 print("Hello "..name) |
| 67 end | |
| 68 | |
| 69 hello("Bob") | |
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70 </pre> |
| 382 | 71 |
| 72 <p>The <b>..</b> operator does concatenation. This will print <b>Hello Bob</b>.</p> | |
| 73 | |
| 1217 | 74 <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: |
| 382 | 75 |
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76 <pre><%=Html.encode[[ |
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693
ca169567ce07
module URIs must now include ".luan"
Franklin Schmidt <fschmidt@gmail.com>
parents:
686
diff
changeset
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77 local Io = require "luan:Io.luan" |
|
ca169567ce07
module URIs must now include ".luan"
Franklin Schmidt <fschmidt@gmail.com>
parents:
686
diff
changeset
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78 local Http = require "luan:http/Http.luan" |
| 382 | 79 |
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parents:
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80 return function() |
| 382 | 81 Io.stdout = Http.response.text_writer() |
| 736 | 82 %> |
| 1216 | 83 <!doctype html> |
| 736 | 84 <html> |
| 85 <body> | |
| 86 Hello World | |
| 87 </body> | |
| 88 </html> | |
| 89 <% | |
| 382 | 90 end |
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91 ]]%></pre> |
| 382 | 92 |
| 1217 | 93 <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> |
| 382 | 94 |
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95 <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 | 96 |
| 1217 | 97 <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> |
| 382 | 98 |
| 401 | 99 <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 | 100 |
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101 <pre> |
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102 luan luan:host/push.luan bob.s1.luanhost.com secret site |
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103 </pre> |
| 382 | 104 |
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105 <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> |
| 382 | 106 |
| 107 <p>Hopefully this short tutorial gave you an idea of how to use Luan to make a website.</p> | |
| 108 | |
| 109 </div> | |
| 110 | |
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111 </body> |
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112 </html> |
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113 <% |
| 382 | 114 end |