Mercurial Hosting > luan
diff website/src/tutorial.html.luan @ 1928:e16f38f4fdfc default tip
minor
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Sun, 27 Apr 2025 04:24:08 -0600 |
parents | 50e570b598b2 |
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--- a/website/src/tutorial.html.luan Wed Apr 23 20:06:58 2025 -0600 +++ b/website/src/tutorial.html.luan Sun Apr 27 04:24:08 2025 -0600 @@ -31,7 +31,7 @@ <% </code> -<p>To run this, type <b>luan hello.luan</b> on the command line. This should print <b>Hello World</b>.</p> +<p>To run this, type <code>luan hello.luan</code> on the command line. This should print <b>Hello World</b>.</p> <p>The syntax here is based on <a href="https://en.wikipedia.org/wiki/Jakarta_Server_Pages">JSP</a>. Let's change it a little:</p> @@ -51,11 +51,11 @@ print("Hello World") </code> -<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> +<p>In Luan, a function call with one string argument doesn't require parenthesis, so <code>print("Hello World")</code> is the same as <code>print "Hello World"</code> and <code>require "luan:Io.luan"</code> is the same as <code>require("luan:Io.luan")</code>. Both <code>require</code> and <code>print</code> are functions.</p> -<p>The <b>require</b> function takes a <a href="https://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> +<p>The <code>require</code> function takes a <a href="https://en.wikipedia.org/wiki/Uniform_Resource_Identifier">URI</a> as an argument. Examples of URIs are <code>luan:Io.luan</code> and <code>file:hello.luan</code>. <code>require</code> is used to import a module, which is returned from the <code>require</code> function call. In the case above, we assign the module to the local variable <code>Io</code>. The function <code>print</code> is a member of this module. We could have done <code>Io.print("Hello World")</code> but instead we chose to assign <code>print</code> to a local variable and use that to call the function.</p> -<p>Luan starts with only one defined function: <b>require</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> +<p>Luan starts with only one defined function: <code>require</code>. You will use <code>require</code> to import whatever you need. This is a little more work, but makes it clear in each file where each function comes from.</p> <p>Let's a make fancier version:</p> @@ -70,7 +70,7 @@ hello("Bob") </code> -<p>The <b>..</b> operator does concatenation. This will print <b>Hello Bob</b>.</p> +<p>The <code>..</code> operator does concatenation. This will print <b>Hello Bob</b>.</p> <p>Now let's make a web page. First we need a directory for our website. So create a directory <b>src</b>. In this directory, create a file <b>hi.html.luan</b> containing: @@ -91,9 +91,9 @@ end </code> -<p>Now go back to the parent directory and do <b>luan luan:http/serve.luan src</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. In fact the page that you are currently looking at <b>tutorial.html</b> is generated from <a href="tutorial.html.luan">tutorial.html.luan</a>.</p> +<p>Now go back to the parent directory and do <code>luan luan:http/serve.luan src</code>. 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. In fact the page that you are currently looking at <b>tutorial.html</b> is generated from <a href="tutorial.html.luan">tutorial.html.luan</a>.</p> -<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> +<p>The Luan webserver expects the file to return a function and calls it to generate the page. Code of the form <code>%>...<%</code> writes its output to <code>Io.stdout</code> which by default is the standard output of the command line. So in the returned function one usually starts by setting <code>Io.stdout</code> to a <code>text_writer</code> which writes its output to the HTTP response (to the web browser).</p> <p>You can find this example and others in the <a href="examples/">examples directory</a>. Take a look at <a href="examples/hi2.html.luan">hi2.html.luan</a> next. Remember to remove the <b>.luan</b> from the URL to run the code.</p> @@ -103,7 +103,7 @@ luan luan:host/push.luan bob.s1.luan.software secret src </code> -<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> +<p>The form is <code>luan luan:host/push.luan domain password directory</code>. If you change your site, just run this again and your site will be updated. To delete your site, do <code>luan luan:host/delete.luan domain password</code>.</p> <p>Hopefully this short tutorial gave you an idea of how to use Luan to make a website.</p>