diff --git a/demo/kitchen-sink/doclist.js b/demo/kitchen-sink/doclist.js
index b0198238..a4848d50 100644
--- a/demo/kitchen-sink/doclist.js
+++ b/demo/kitchen-sink/doclist.js
@@ -169,13 +169,44 @@ function loadDoc(name, callback) {
     });
 }
 
+function saveDoc(name, callback) {
+    var doc = fileCache[name] || name;
+    if (!doc || !doc.session)
+        return callback("Unknown document: " + name);
+
+    var path = doc.path;
+    var parts = path.split("/");
+    if (parts[0] == "docs")
+        path = "demo/kitchen-sink/" + path;
+    else if (parts[0] == "ace")
+        path = "lib/" + path;
+
+    upload(path, doc.session.getValue(), callback);
+}
+
+function upload(url, data, callback) {
+    url = net.qualifyURL(url);
+    if (!/https?:/.test(url))
+        return callback(new Error("Unsupported url scheme"));
+    var xhr = new XMLHttpRequest();
+    xhr.open("PUT", url, true);
+    xhr.onreadystatechange = function () {
+        if (xhr.readyState === 4) {
+            callback(!/^2../.test(xhr.status));
+        }
+    };
+    xhr.send(data);
+};
+
+
 module.exports = {
     fileCache: fileCache,
     docs: sort(prepareDocList(docs)),
     ownSource: prepareDocList(ownSource),
     hugeDocs: prepareDocList(hugeDocs),
     initDoc: initDoc,
-    loadDoc: loadDoc
+    loadDoc: loadDoc,
+    saveDoc: saveDoc,
 };
 module.exports.all = {
     "Mode Examples": module.exports.docs,
diff --git a/lib/ace/mode/abap_highlight_rules.js b/lib/ace/mode/abap_highlight_rules.js
index 6b232c90..bab1e504 100644
--- a/lib/ace/mode/abap_highlight_rules.js
+++ b/lib/ace/mode/abap_highlight_rules.js
@@ -126,7 +126,7 @@ var AbapHighlightRules = function() {
             {token : "string", regex : "`",     next  : "start"},
             {defaultToken : "string"}
         ]
-    }
+    };
 };
 oop.inherits(AbapHighlightRules, TextHighlightRules);
 
diff --git a/static.js b/static.js
index 4f7e7248..a711715e 100755
--- a/static.js
+++ b/static.js
@@ -10,37 +10,100 @@ var http = require("http")
 
 // compatibility with node 0.6
 if (!fs.exists)
-  fs.exists = path.exists;
+    fs.exists = path.exists;
 
-http.createServer(function(request, response) {
+var allowSave = process.argv.indexOf("--allow-save") != -1;
 
-  var uri = url.parse(request.url).pathname
-    , filename = path.join(process.cwd(), uri);
-  
-  fs.exists(filename, function(exists) {
-    if(!exists) {
-      response.writeHead(404, {"Content-Type": "text/plain"});
-      response.write("404 Not Found\n");
-      response.end();
-      return;
+http.createServer(function(req, res) {
+    var uri = url.parse(req.url).pathname
+      , filename = path.join(process.cwd(), uri);
+
+    if (req.method == "PUT") {
+        if (!allowSave)
+            return error(res, 404, "Saving not allowed pass --allow-save to enable");
+        save(req, res, filename);
     }
 
-    if (fs.statSync(filename).isDirectory()) filename += '/index.html';
+    fs.exists(filename, function(exists) {
+        if (!exists)
+            return error(res, 404, "404 Not Found\n");
 
-    fs.readFile(filename, "binary", function(err, file) {
-      if(err) {        
-        response.writeHead(500, {"Content-Type": "text/plain"});
-        response.write(err + "\n");
-        response.end();
-        return;
-      }
+        if (fs.statSync(filename).isDirectory()) {
+            var files = fs.readdirSync(filename);
+            res.writeHead(200, {"Content-Type": "text/html"});
+            
+            files.push(".", "..");
+            var html = files.map(function(name) {
+                var href = uri + "/" + name;
+                href = href.replace(/[\/\\]+/g, "/").replace(/\/$/g, "");
+                if (fs.statSync(filename + "/" + name + "/").isDirectory())
+                    href += "/";
+                return "<a href='" + href + "'>" + name + "</a><br>";
+            });
 
-      var contentType = mime.lookup(filename) || "text/plain";
-      response.writeHead(200, {"Content-Type": contentType});
-      response.write(file, "binary");
-      response.end();
+            res._hasBody && res.write(html.join(""));
+            res.end();
+            return;
+        }
+
+        fs.readFile(filename, "binary", function(err, file) {
+            if (err) {
+                res.writeHead(500, { "Content-Type": "text/plain" });
+                res.write(err + "\n");
+                res.end();
+                return;
+            }
+
+            var contentType = mime.lookup(filename) || "text/plain";
+            res.writeHead(200, { "Content-Type": contentType });
+            res.write(file, "binary");
+            res.end();
+        });
     });
-  });
 }).listen(port, ip);
 
-console.log("http://localhost:" + port);
+function error(res, status, message, error) {
+    console.error(error || message);
+    res.writeHead(status, { "Content-Type": "text/plain" });
+    res.write(message);
+    res.end();
+}
+
+function save(req, res, filePath) {
+    var data = "";
+    req.on("data", function(chunk) {
+        data += chunk;
+    });
+    req.on("error", function() {
+        error(res, 404, "Could't save file");
+    });
+    req.on("end", function() {
+        try {
+            fs.writeFileSync(filePath, data);
+        }
+        catch (e) {
+            return error(res, 404, "Could't save file", e);
+        }
+        res.statusCode = 200;
+        res.end("OK");
+    });
+}
+
+function getLocalIps() {
+    var os = require("os");
+
+    var interfaces = os.networkInterfaces ? os.networkInterfaces() : {};
+    var addresses = [];
+    for (var k in interfaces) {
+        for (var k2 in interfaces[k]) {
+            var address = interfaces[k][k2];
+            if (address.family === "IPv4" && !address.internal) {
+                addresses.push(address.address);
+            }
+        }
+    }
+    return addresses;
+}
+
+console.log("http://" + (ip == "0.0.0.0" ? getLocalIps()[0] : ip) + ":" + port);
+
diff --git a/static.py b/static.py
index eb864596..7a2faf91 100755
--- a/static.py
+++ b/static.py
@@ -32,7 +32,9 @@ import time
 import string
 import sys
 from os import path, stat, getcwd
+from fnmatch import fnmatch
 from wsgiref import util
+from wsgiref.validate import validator
 from wsgiref.headers import Headers
 from wsgiref.simple_server import make_server
 from optparse import OptionParser
@@ -84,6 +86,8 @@ class Cling(object):
     not_modified = StatusApp('304 Not Modified', "")
     moved_permanently = StatusApp('301 Moved Permanently')
     method_not_allowed = StatusApp('405 Method Not Allowed')
+    success_no_content = StatusApp('204 No Content', "")
+    server_error = StatusApp('500 Internal Server Error')
 
     def __init__(self, root, **kw):
         """Just set the root and any other attribs passes via **kw."""
@@ -93,9 +97,6 @@ class Cling(object):
 
     def __call__(self, environ, start_response):
         """Respond to a request when called in the usual WSGI way."""
-        if environ['REQUEST_METHOD'] not in ('GET', 'HEAD'):
-            headers = [('Allow', 'GET, HEAD')]
-            return self.method_not_allowed(environ, start_response, headers)
         path_info = environ.get('PATH_INFO', '')
         full_path = self._full_path(path_info)
         if not self._is_under_root(full_path):
@@ -109,6 +110,23 @@ class Cling(object):
                 return self.moved_permanently(environ, start_response, headers)
             else:
                 full_path = self._full_path(path_info + self.index_file)
+        try:
+            sz = int(environ['CONTENT_LENGTH'])
+        except:
+            sz = 0
+        if environ['REQUEST_METHOD'] == 'PUT' and sz > 0:
+            for putglob in self.puttable:
+                if fnmatch(path_info, putglob):
+                    data = environ['wsgi.input'].read(sz)
+                    try:
+                        with open(full_path, "wb") as f: f.write(data)
+                        return self.success_no_content(environ, start_response)
+                    except:
+                        print sys.exc_info()[1]
+                        return self.server_error(environ, start_response)
+        if environ['REQUEST_METHOD'] not in ('GET', 'HEAD'):
+            headers = [('Allow', 'GET, HEAD')]
+            return self.method_not_allowed(environ, start_response, headers)
         content_type = self._guess_type(full_path)
         try:
             etag, last_modified = self._conditions(full_path, environ)
@@ -191,52 +209,90 @@ def cling_wrap(package_name, dir_name, **kw):
 
 
 def command():
-    parser = OptionParser(usage="%prog DIR [HOST][:][PORT]",
-                          version="static 0.3.6")
+    usage = "%prog [--help] [-d DIR] [-l [HOST][:PORT]] [-p GLOB[,GLOB...]]"
+    parser = OptionParser(usage=usage, version="static 0.3.6")
+    parser.add_option("-d", "--dir", dest="rootdir", default=".",
+        help="Root directory to serve. Defaults to '.' .", metavar="DIR")
+    parser.add_option("-l", "--listen", dest="listen", default="127.0.0.1:8888",
+        help="Listen on this interface (given by its hostname or IP) and port."+
+             " HOST defaults to 127.0.0.1. PORT defaults to 8888. "+
+             "Leave HOST empty to listen on all interfaces (INSECURE!).",
+             metavar="[HOST][:PORT]")
+    parser.add_option("-p", "--puttable", dest="puttable", default="",
+             help="Comma or space-separated list of request paths for which to"+
+                  " permit PUT requests. Each path is a glob pattern that may "+
+                  "contain wildcard characters '*' and/or '?'. "+
+                  "'*' matches any sequence of characters, including the empty"+
+                  " string. '?' matches exactly 1 arbitrary character. "+
+                  "NOTE: Both '*' and '?' match slashes and dots. "+
+                  "I.e. --puttable=* makes every file under DIR writable!",
+                  metavar="GLOB[,GLOB...]")
+    parser.add_option("--validate", dest="validate", action="store_true",
+                  default=False,
+                  help="Enable HTTP validation. You don't need this unless "+
+                       "you're developing static.py itself.")
+
     options, args = parser.parse_args()
-    if len(args) in (1, 2):
-        if len(args) == 2:
-            parts = args[1].split(":")
-            if len(parts) == 1:
-                host = parts[0]
-                port = None
-            elif len(parts) == 2:
-                host, port = parts
-            else:
-                sys.exit("Invalid host:port specification.")
-        elif len(args) == 1:
-            host, port = None, None
-        if not host:
-            host = '0.0.0.0'
-        if not port:
-            port = 8888
-        try:
-            port = int(port)
-        except:
-            sys.exit("Invalid host:port specification.")
-        app = Cling(args[0])
-        try:
-            make_server(host, port, app).serve_forever()
-        except KeyboardInterrupt, ki:
-            print "Cio, baby!"
-        except:
-            sys.exit("Problem initializing server.")
-    else:
+    if len(args) > 0:
         parser.print_help(sys.stderr)
         sys.exit(1)
 
+    parts = options.listen.split(":")
+    if len(parts) == 1:
+        try: # if the the listen argument consists only of a port number
+            port = int(parts[0])
+            host = None
+        except: # could not parse as port number => must be a host IP or name
+            host = parts[0]
+            port = None
+    elif len(parts) == 2:
+        host, port = parts
+    else:
+        sys.exit("Invalid host:port specification.")
 
-def test():
-    from wsgiref.validate import validator
-    app = Cling(getcwd())
+    if not host:
+        host = '0.0.0.0'
+    if not port:
+        port = 8888
     try:
-        print "Serving " + getcwd() + " to http://localhost:8888"
-        make_server('0.0.0.0', 8888, validator(app)).serve_forever()
+        port = int(port)
+        if port <= 0 or port > 65535: raise ValueError
+    except:
+        sys.exit("Invalid host:port specification.")
+
+    puttable = set(path.abspath(p) for p in
+                                     options.puttable.replace(","," ").split())
+    if puttable and host not in ('127.0.0.1', 'localhost'):
+        print("Permitting PUT access for non-localhost connections may be unwise.")
+
+    options.rootdir = path.abspath(options.rootdir)
+
+    for p in puttable:
+        if not p.startswith(options.rootdir):
+            sys.exit("puttable path '%s' not under root '%s'" % (p, options.rootdir))
+
+    # cut off root prefix from puttable paths
+    puttable = set(p[len(options.rootdir):] for p in puttable)
+
+    app = Cling(options.rootdir, puttable=puttable)
+
+    if options.validate:
+        app = validator(app)
+
+    try:
+        print "Serving %s to http://%s:%d" % (options.rootdir, host, port)
+        if puttable:
+            print("The following paths (relative to server root) may be "+
+                  "OVERWRITTEN via HTTP PUT.")
+            for p in puttable:
+                print p
+        make_server(host, port, app).serve_forever()
     except KeyboardInterrupt, ki:
-        print ""
         print "Ciao, baby!"
+    except:
+        sys.exit("Problem initializing server: %s" % sys.exc_info()[1])
 
 
 if __name__ == '__main__':
-    test()
+    command()
 
diff --git a/tool/mode_creator.html b/tool/mode_creator.html
index e2db56af..259ba64e 100644
--- a/tool/mode_creator.html
+++ b/tool/mode_creator.html
@@ -19,7 +19,7 @@
             border-bottom: solid 1px;
         }
         .separator-h {
-            padding: 0 20px;
+            padding: 0 10px;
         }
         #closeBtn {
             background: rgba(245, 146, 146, 0.5);
@@ -59,6 +59,7 @@
     <select id="modeEl" size="1"></select>
     <input type="button" value="&#10227;" title="sync" id="syncToMode"></select>
     <span id="tablist"></span>
+    <input type="button" value="Save" id="saveButton1"></select>
     <span class="separator-h"></span>
     <label for="autorunEl">live preview</label>
     <input type="checkbox" label="autorun" id="autorunEl" checked>
@@ -70,6 +71,7 @@
         <label for="themeEl">Theme</label>
         <select id="themeEl" size="1" value="textmate"></select>
         <span class="separator-h"></span>
+        <input type="button" value="Save" id="saveButton2"></select>
         <label for="doc">Document</label>
         <select id="doc" size="1"></select>
     </div>
diff --git a/tool/mode_creator.js b/tool/mode_creator.js
index 6b1122cd..e79c54c6 100644
--- a/tool/mode_creator.js
+++ b/tool/mode_creator.js
@@ -53,6 +53,8 @@ util.bindDropdown("doc", function(value) {
     doclist.loadDoc(value, function(session) {
         if (session) {
             editor2.setSession(session);
+            session.getUndoManager().markClean();
+            updateSaveButtonState(null, editor2);
         }
     });
 });
@@ -60,6 +62,7 @@ util.bindDropdown("doc", function(value) {
 var modeEl = document.getElementById("modeEl");
 util.fillDropdown(modeEl, modelist.modes);
 var modeSessions = {};
+
 util.bindDropdown(modeEl, function(value) {
     if (modeSessions[value]) {
         editor1.setSession(modeSessions[value]);
@@ -68,14 +71,18 @@ util.bindDropdown(modeEl, function(value) {
     }
     var hp = "./lib/ace/mode/" + value + "_highlight_rules.js";
     net.get(hp, function(text) {
-        text = util.stripLeadingComments(text);
-
         var session = new EditSession(text);
         session.setUndoManager(new UndoManager());
+
         modeSessions[value] = session;
-        session.setMode("ace/mode/javascript");
+        session.setMode("ace/mode/javascript", function() {
+            if (session.getLine(0).match(/^\s*\//))
+                session.toggleFoldWidget(0); // fold licence comment
+        });
 
         editor1.setSession(modeSessions[value]);
+        session.getUndoManager().markClean();
+        updateSaveButtonState(null, editor1);
         schedule();
     });
 });
@@ -85,6 +92,50 @@ document.getElementById("syncToMode").onclick = function() {
     docEl.onchange();
     run();
 };
+
+editor1.saveButton = document.getElementById("saveButton1");
+editor2.saveButton = document.getElementById("saveButton2");
+editor1.saveButton.editor = editor1;
+editor2.saveButton.editor = editor2;
+
+editor1.saveButton.onclick = function() {
+    doclist.saveDoc({
+        path: "./lib/ace/mode/" + modeEl.value + "_highlight_rules.js",
+        session: editor1.session
+    }, function(err) {
+        handleSaveResult(err, editor1);
+    });
+};
+editor1.commands.bindKey({
+    win: "Ctrl-S", mac: "Cmd-s"
+}, editor1.saveButton.onclick);
+editor2.saveButton.onclick = function() {
+    doclist.saveDoc(docEl.value, function(err) {
+        handleSaveResult(err, editor2);
+    });
+};
+editor2.commands.bindKey({
+    win: "Ctrl-S", mac: "Cmd-s"
+}, editor2.saveButton.onclick);
+function updateSaveButtonState(e, editor){
+    editor.saveButton.disabled = editor.session.getUndoManager().isClean();
+}
+editor1.on("input", updateSaveButtonState);
+editor2.on("input", updateSaveButtonState);
+
+function handleSaveResult(err, editor) {
+    if (err) {
+        return log(
+            "Write access to this file is disabled.\n"+
+            "To enable saving your changes to disk, clone the Ace repository\n"+
+            "and run the included web server with the --allow-write option\n"+
+            "`node static.js --allow-write` or `static.py --puttable=*`"
+        );
+    }
+    editor.session.getUndoManager().markClean();
+    updateSaveButtonState(null, editor);
+}
+
 document.getElementById("perfTest").onclick = function() {
     var lines = editor2.session.doc.getAllLines();
     if (!lines.length)