Added initial hello-world module.

.gitignore

@@ -0,0 +1 @@
+/var/tmp

css/000-modulewrapper.css

@@ -0,0 +1,22 @@
+.modulewrapper {
+    position: relative;
+    width: 100%;
+    padding: 1em 0;
+}
+
+.modulewrapper::before, .modulewrapper::after {
+    content: "";
+    width: 100%;
+    height: 1px;
+    background: lightgray;
+    position: absolute;
+    left: 0;
+}
+
+.modulewrapper::before {
+    top: 0;
+}
+
+.modulewrapper::after {
+    bottom: 0;
+}

css/001-main.css

@@ -0,0 +1,37 @@
+table {
+    position: relative;
+    width: 80ch;
+    margin: 2em 0;
+}
+
+thead::after {
+    content: "";
+    width: 100%;
+    height: 1px;
+    position: absolute;
+    background: black;
+}
+
+td, tr, th {
+    margin: 0;
+    padding: .2em;
+    position: relative;
+}
+
+th:first-child {
+    width: 30%;
+}
+
+th:last-child {
+    width: 70%;
+}
+
+td:last-child::before {
+    content: "";
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 1px;
+    height: calc(100% + .4em);
+    background: black;
+}

etc/config.php

@@ -0,0 +1,5 @@
+<?php
+
+return [
+    "this-key" => "has been added in the module etc/config.php file.",
+];

module.php

@@ -0,0 +1,86 @@
+<?php
+
+return new class extends \Lewp\Module {
+
+    private function createOptionsTable(array $options)
+    {
+        // create head row
+        $head_cells = [
+            $this->createElement("th", "Key"),
+            $this->createElement("th", "Value")
+        ];
+        $head_row = $this->createElement("tr");
+        foreach ($head_cells as $cell) {
+            $head_row->appendChild($cell);
+        }
+        // create table body
+        $tbody = $this->createElement("tbody");
+        foreach ($options as $key => $value) {
+            $tr = $this->createElement("tr");
+            $td = $this->createElement("td", $key);
+            $tr->appendChild($td);
+            if (is_array($value)) {
+                $td = $this->createElement("td", "[".implode(", ", $value)."]");
+            } elseif ($value === true) {
+                $td = $this->createElement("td", "true");
+            } elseif ($value === false) {
+                $td = $this->createElement("td", "false");
+            } else {
+                $td = $this->createElement("td", $value);
+            }
+            $tr->appendChild($td);
+            $tbody->appendChild($tr);
+        }
+        // construct the table
+        $thead = $this->createElement("thead");
+        $thead->appendChild($head_row);
+        $thead->appendChild($tbody);
+
+        $table = $this->createElement("table", "", [
+            "class" => "table"
+        ]);
+        $table->appendChild($thead);
+        $table->appendChild($tbody);
+
+        return $table;
+    }
+
+    private function addPageId() {
+        $div = $this->createElement("div", null, [
+            "class" => "page-id-wrapper"
+        ]);
+        $h2 = $this->createElement("h2", "Current page id: \"".$this->getPageId()."\"");
+        $p = $this->createElement("p");
+        $text = $this->createTextNode("Click on this ");
+        $p->appendChild($text);
+        $href = "/".$this->getPageId()."/hello/dynamic_uri/123456";
+        $a = $this->createElement("a", "link (".$href.")", [
+            "href" => $href
+        ]);
+        $p->appendChild($a);
+        $text = $this->createTextNode(" to see dynamic_uri_parts option at work.");
+        $p->appendChild($text);
+        $p->appendChild($this->createElement("br"));
+        $italic = $this->createElement("i", "Please notice that the separation of \"dynamic_uri\" is due to the file hierarchy convention. It is intended, not a bug.");
+        $p->appendChild($italic);
+
+        $div->appendChild($h2);
+        $div->appendChild($p);
+        return $div;
+    }
+
+    public function run(array $options = []) : bool
+    {
+        $this->appendChild($this->addPageId());
+        $this->appendChild($this->createElement("h2", "\$options content"));
+        $this->appendChild($this->createOptionsTable($options));
+        $this->appendChild($this->createElement("h2", "\$this->configuration->get() content"));
+        $this->appendChild($this->createOptionsTable($this->configuration->get()));
+        return true;
+    }
+
+    public function onWebsocketRequest(
+        \Lewp\Websocket\Message $message
+    ) : \Lewp\Websocket\Message {
+    }
+};