Kepler: LuaScripts and LuaPages

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Page Parameters

Page Name (for URL)

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Page Title

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Kepler 1.1 provides two mechanisms for sending a page back to the browser: LuaPage and LuaScript.

LuaPage is an HTML file with some Lua code in it, e.g.

<html>
 <head>...</head>
 <body>...</body>
 CGI Parameter X: <%= cgi.x %>

A loop:

</html>

This file should be saved with the ``.lp`` extension, e.g. ``showx.lp``.

A LuaScript is just a Lua program that writes HTML through ``cgi.put``:

cgilua.contentheader ("text", "html")

cgilua.put([[<html>
 <head>...</head>
 <body>...</body>]])

cgilua.put(string.format("CGI Parameter X: %s",
 cgi.x)

cgilua.put("<ul>")

for i=1,5 do 
 cgilua.put("<li>")
 cgilua.put(i)
 cgilua.put("</li>")
 end

cgilua.put("</ul>")
 cgilua.put("</html>")

This should be saved with a ``.lua`` extension, e.g. ``showx.lua``.

LuaPages can be nested inside other LuaPages using ``cgilua.lp.include()``, e.g.

``showx.lp``:

``justx.lp``:

CGI Parameter X: <%= cgi.x %>

A loop:

They can also be included in LuaScripts, e.g. we can rewrite ``showx.lua`` as:

cgilua.contentheader ("text", "html")

cgilua.put([[<html>
 <head>...</head>
 <body>...</body>]])
 
 cgilua.lp.include ("justx.lp")

cgilua.put("</html>")

More practically, you might want to use a LuaScript to dispatch requests to multiple lua pages:

if cgi.action == "rss" then
       cgilua.contentheader ("application", "rss+xml")
    else 
       cgilua.contentheader ("text", "html")
    end

function figure_out_the_title(...) ... end
    function figure_out_the_lua_page(...) ... end

new_title = figure_out_the_title(cgi)
    lua_page = figure_out_the_lua_page(cgi)

cgi.title = params.new_title

if not cgi.action == "rss" then
       cgilua.lp.include("header.lp")
    else
       cgilua.lp.include("rss-header.lp")
    end

cgilua.lp.include(lua_page)

if not cgi.action == "rss" then
       cgilua.lp.include("footer.lp")
    else
       cgilua.lp.include("rss-footer.lp")
    end

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