Add flats to the list (WIP)

Pretty rough, lots of copy pasta, but a place to work from.

index.html

@@ -37,6 +37,8 @@
 </div>
 <div id="texture-list">
 </div>
+<div id="flat-list">
+</div>
 <script language="javascript" src="texture.js">
 </script>
 </body>

texture.js

@@ -228,6 +228,77 @@ function renderAllTextures(element, game) {
 	});
 }
 
+// ...
+// XXX hardcoded heretic
+function drawFlat(f) {
+    fn = "heretic/flats/"+f.toLowerCase()+".png";
+    var img = document.createElement("img");
+    img.src = fn;
+    return img;
+}
+
+// ...
+function parseFlats(wadinfo) {
+    var lines = wadinfo.split("\n");
+    var i;
+    var flats = []; f = null;
+    // skip until [flats]
+    for (i = 0; i < lines.length; ++i) {
+        if(lines[i] == "[flats]") {
+            i++;
+            break;
+        }
+    }
+    for(; i < lines.length; ++i) {
+        if(lines[i].length <= 0) {
+            // end of flats
+            break;
+        }
+        flats.push(lines[i]);
+    }
+    return flats;
+}
+
+// loadWadInfo loads and parses a deutex-format wadinfo file to find a
+// list of flat names. The provided callback is invoked with the list of
+// flats from the file.
+function loadWadInfo(url, callback) {
+	var xhr = new XMLHttpRequest();
+	xhr.open('GET', url);
+	xhr.onreadystatechange = function() {
+		console.log("response loading " + xhr.responseURL + ": " +
+		            xhr.status);
+		if (xhr.readyState == XMLHttpRequest.DONE && xhr.status == 200) {
+			var flats = parseFlats(xhr.responseText);
+			console.log("loaded " + flats.length +
+			            " flats from file: " + xhr.responseURL);
+			callback(flats);
+		}
+	}
+	xhr.send();
+}
+
+// renderAllFlats populates the given HTML element with <canvas> elements
+// for all flats in the given game. (see above)
+function renderAllFlats(element, game) {
+	var url = game + "/wadinfo.txt";
+	console.log("load flats from " + url);
+    loadWadInfo(url, function(flats) {
+        element.innerHTML = "";
+        var i;
+        for (i = 0; i < flats.length; ++i) {
+            var f  = flats[i];
+            var img = drawFlat(f);
+            var div = document.createElement("div");
+            div.className = "texdiv";
+            div.appendChild(img);
+            div.appendChild(document.createElement("br"));
+            div.appendChild(document.createTextNode(f));
+            element.appendChild(div);
+        }
+    });
+}
+
 // getGame looks for a URL parameter in the loaded page specifying which game
 // to render textures for; if none exists then 'doom1' is the default.
 function getGame() {
@@ -247,5 +318,10 @@ window.onload = function() {
 	var game = getGame();
 	console.log("rendering for " + game);
 	renderAllTextures(el, game);
+
+	el = document.getElementById("flat-list");
+	el.innerHTML = "Loading...";
+	console.log("rendering flats for " + game);
+	renderAllFlats(el, game);
 }