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module URIs must now include ".luan"
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 19 Apr 2016 15:54:11 -0600
parents 33f1b4ad2c9d
children 2113294ccc6d
comparison
equal deleted inserted replaced
692:7bd97d642f37 693:ca169567ce07
1 local Io = require "luan:Io" 1 local Io = require "luan:Io.luan"
2 local Html = require "luan:Html" 2 local Html = require "luan:Html.luan"
3 local Http = require "luan:http/Http" 3 local Http = require "luan:http/Http.luan"
4 local Shared = require "site:/Shared" 4 local Shared = require "site:/Shared.luan"
5 5
6 6
7 return function() 7 return function()
8 Io.stdout = Http.response.text_writer() 8 Io.stdout = Http.response.text_writer()
9 %> 9 %>
41 ]]%></pre> 41 ]]%></pre>
42 42
43 <p>This should print <b>Hello Bob</b>. Now let's try a more conventional approach:</p> 43 <p>This should print <b>Hello Bob</b>. Now let's try a more conventional approach:</p>
44 44
45 <pre> 45 <pre>
46 local Io = require "luan:Io" 46 local Io = require "luan:Io.luan"
47 local print = Io.print 47 local print = Io.print
48 48
49 print("Hello World") 49 print("Hello World")
50 </pre> 50 </pre>
51 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> 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.luan"</b> is the same as <b>require("luan:Io.luan")</b>. Both <b>require</b> and <b>print</b> are functions.</p>
53 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> 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.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>
55 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> 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 57
58 <p>Let's a make fancier version:</p> 58 <p>Let's a make fancier version:</p>
59 59
60 <pre> 60 <pre>
61 local Io = require "luan:Io" 61 local Io = require "luan:Io.luan"
62 local print = Io.print 62 local print = Io.print
63 63
64 local function hello(name) 64 local function hello(name)
65 print("Hello "..name) 65 print("Hello "..name)
66 end 66 end
71 <p>The <b>..</b> operator does concatenation. This will print <b>Hello Bob</b>.</p> 71 <p>The <b>..</b> operator does concatenation. This will print <b>Hello Bob</b>.</p>
72 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: 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 74
75 <pre><%=Html.encode[[ 75 <pre><%=Html.encode[[
76 local Io = require "luan:Io" 76 local Io = require "luan:Io.luan"
77 local Http = require "luan:http/Http" 77 local Http = require "luan:http/Http.luan"
78 78
79 return function() 79 return function()
80 Io.stdout = Http.response.text_writer() 80 Io.stdout = Http.response.text_writer()
81 %> 81 %>
82 <html> 82 <html>
86 </html> 86 </html>
87 <% 87 <%
88 end 88 end
89 ]]%></pre> 89 ]]%></pre>
90 90
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> 91 <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.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>
92 92
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> 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>
94 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> 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 96
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: 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:
98 98
99 <pre> 99 <pre>
100 luan luan:host/push bob.s1.luanhost.com secret site 100 luan luan:host/push.luan bob.s1.luanhost.com secret site
101 </pre> 101 </pre>
102 102
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> 103 <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>
104 104
105 <p>Hopefully this short tutorial gave you an idea of how to use Luan to make a website.</p> 105 <p>Hopefully this short tutorial gave you an idea of how to use Luan to make a website.</p>
106 106
107 </div> 107 </div>
108 108