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tools/scripts/app_engine_server/gae_shell/README
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An interactive, stateful AJAX shell that runs Python code on the server.
Part of http://code.google.com/p/google-app-engine-samples/.
May be run as a standalone app or in an existing app as an admin-only handler.
Can be used for system administration tasks, as an interactive way to try out
APIs, or as a debugging aid during development.
The logging, os, sys, db, and users modules are imported automatically.
Interpreter state is stored in the datastore so that variables, function
definitions, and other values in the global and local namespaces can be used
across commands.
To use the shell in your app, copy shell.py, static/*, and templates/* into
your app's source directory. Then, copy the URL handlers from app.yaml into
your app.yaml.

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tools/scripts/app_engine_server/gae_shell/__init__.py
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tools/scripts/app_engine_server/gae_shell/__init__.pyc
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tools/scripts/app_engine_server/gae_shell/shell.py
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#!/usr/bin/python
#
# Copyright 2007 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
An interactive, stateful AJAX shell that runs Python code on the server.
Part of http://code.google.com/p/google-app-engine-samples/.
May be run as a standalone app or in an existing app as an admin-only handler.
Can be used for system administration tasks, as an interactive way to try out
APIs, or as a debugging aid during development.
The logging, os, sys, db, and users modules are imported automatically.
Interpreter state is stored in the datastore so that variables, function
definitions, and other values in the global and local namespaces can be used
across commands.
To use the shell in your app, copy shell.py, static/*, and templates/* into
your app's source directory. Then, copy the URL handlers from app.yaml into
your app.yaml.
TODO: unit tests!
"""
import logging
import new
import os
import pickle
import sys
import traceback
import types
import wsgiref.handlers
from google.appengine.api import users
from google.appengine.ext import db
from google.appengine.ext import webapp
from google.appengine.ext.webapp import template
# Set to True if stack traces should be shown in the browser, etc.
_DEBUG = True
# The entity kind for shell sessions. Feel free to rename to suit your app.
_SESSION_KIND = '_Shell_Session'
# Types that can't be pickled.
UNPICKLABLE_TYPES = (
types.ModuleType,
types.TypeType,
types.ClassType,
types.FunctionType,
)
# Unpicklable statements to seed new sessions with.
INITIAL_UNPICKLABLES = [
'import logging',
'import os',
'import sys',
'from google.appengine.ext import db',
'from google.appengine.api import users',
]
class Session(db.Model):
"""A shell session. Stores the session's globals.
Each session globals is stored in one of two places:
If the global is picklable, it's stored in the parallel globals and
global_names list properties. (They're parallel lists to work around the
unfortunate fact that the datastore can't store dictionaries natively.)
If the global is not picklable (e.g. modules, classes, and functions), or if
it was created by the same statement that created an unpicklable global,
it's not stored directly. Instead, the statement is stored in the
unpicklables list property. On each request, before executing the current
statement, the unpicklable statements are evaluated to recreate the
unpicklable globals.
The unpicklable_names property stores all of the names of globals that were
added by unpicklable statements. When we pickle and store the globals after
executing a statement, we skip the ones in unpicklable_names.
Using Text instead of string is an optimization. We don't query on any of
these properties, so they don't need to be indexed.
"""
global_names = db.ListProperty(db.Text)
globals = db.ListProperty(db.Blob)
unpicklable_names = db.ListProperty(db.Text)
unpicklables = db.ListProperty(db.Text)
def set_global(self, name, value):
"""Adds a global, or updates it if it already exists.
Also removes the global from the list of unpicklable names.
Args:
name: the name of the global to remove
value: any picklable value
"""
blob = db.Blob(pickle.dumps(value))
if name in self.global_names:
index = self.global_names.index(name)
self.globals[index] = blob
else:
self.global_names.append(db.Text(name))
self.globals.append(blob)
self.remove_unpicklable_name(name)
def remove_global(self, name):
"""Removes a global, if it exists.
Args:
name: string, the name of the global to remove
"""
if name in self.global_names:
index = self.global_names.index(name)
del self.global_names[index]
del self.globals[index]
def globals_dict(self):
"""Returns a dictionary view of the globals.
"""
return dict((name, pickle.loads(val))
for name, val in zip(self.global_names, self.globals))
def add_unpicklable(self, statement, names):
"""Adds a statement and list of names to the unpicklables.
Also removes the names from the globals.
Args:
statement: string, the statement that created new unpicklable global(s).
names: list of strings; the names of the globals created by the statement.
"""
self.unpicklables.append(db.Text(statement))
for name in names:
self.remove_global(name)
if name not in self.unpicklable_names:
self.unpicklable_names.append(db.Text(name))
def remove_unpicklable_name(self, name):
"""Removes a name from the list of unpicklable names, if it exists.
Args:
name: string, the name of the unpicklable global to remove
"""
if name in self.unpicklable_names:
self.unpicklable_names.remove(name)
class FrontPageHandler(webapp.RequestHandler):
"""Creates a new session and renders the shell.html template.
"""
def get(self):
# set up the session. TODO: garbage collect old shell sessions
session_key = self.request.get('session')
if session_key:
session = Session.get(session_key)
else:
# create a new session
session = Session()
session.unpicklables = [db.Text(line) for line in INITIAL_UNPICKLABLES]
session_key = session.put()
template_file = os.path.join(os.path.dirname(__file__), 'templates',
'shell.html')
session_url = '/?session=%s' % session_key
vars = { 'server_software': os.environ['SERVER_SOFTWARE'],
'python_version': sys.version,
'session': str(session_key),
'user': users.get_current_user(),
'login_url': users.create_login_url(session_url),
'logout_url': users.create_logout_url(session_url),
}
rendered = webapp.template.render(template_file, vars, debug=_DEBUG)
self.response.out.write(rendered)
class StatementHandler(webapp.RequestHandler):
"""Evaluates a python statement in a given session and returns the result.
"""
def get(self):
self.response.headers['Content-Type'] = 'text/plain'
# extract the statement to be run
statement = self.request.get('statement')
if not statement:
return
# the python compiler doesn't like network line endings
statement = statement.replace('\r\n', '\n')
# add a couple newlines at the end of the statement. this makes
# single-line expressions such as 'class Foo: pass' evaluate happily.
statement += '\n\n'
# log and compile the statement up front
try:
logging.info('Compiling and evaluating:\n%s' % statement)
compiled = compile(statement, '<string>', 'single')
except:
self.response.out.write(traceback.format_exc())
return
# create a dedicated module to be used as this statement's __main__
statement_module = new.module('__main__')
# use this request's __builtin__, since it changes on each request.
# this is needed for import statements, among other things.
import __builtin__
statement_module.__builtins__ = __builtin__
# load the session from the datastore
session = Session.get(self.request.get('session'))
# swap in our custom module for __main__. then unpickle the session
# globals, run the statement, and re-pickle the session globals, all
# inside it.
old_main = sys.modules.get('__main__')
try:
sys.modules['__main__'] = statement_module
statement_module.__name__ = '__main__'
# re-evaluate the unpicklables
for code in session.unpicklables:
exec code in statement_module.__dict__
# re-initialize the globals
for name, val in session.globals_dict().items():
try:
statement_module.__dict__[name] = val
except:
msg = 'Dropping %s since it could not be unpickled.\n' % name
self.response.out.write(msg)
logging.warning(msg + traceback.format_exc())
session.remove_global(name)
# run!
old_globals = dict(statement_module.__dict__)
try:
old_stdout = sys.stdout
old_stderr = sys.stderr
try:
sys.stdout = self.response.out
sys.stderr = self.response.out
exec compiled in statement_module.__dict__
finally:
sys.stdout = old_stdout
sys.stderr = old_stderr
except:
self.response.out.write(traceback.format_exc())
return
# extract the new globals that this statement added
new_globals = {}
for name, val in statement_module.__dict__.items():
if name not in old_globals or val != old_globals[name]:
new_globals[name] = val
if True in [isinstance(val, UNPICKLABLE_TYPES)
for val in new_globals.values()]:
# this statement added an unpicklable global. store the statement and
# the names of all of the globals it added in the unpicklables.
session.add_unpicklable(statement, new_globals.keys())
logging.debug('Storing this statement as an unpicklable.')
else:
# this statement didn't add any unpicklables. pickle and store the
# new globals back into the datastore.
for name, val in new_globals.items():
if not name.startswith('__'):
session.set_global(name, val)
finally:
sys.modules['__main__'] = old_main
session.put()
def main():
application = webapp.WSGIApplication(
[('/gae_shell/', FrontPageHandler),
('/gae_shell/shell.do', StatementHandler)], debug=_DEBUG)
wsgiref.handlers.CGIHandler().run(application)
if __name__ == '__main__':
main()

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tools/scripts/app_engine_server/gae_shell/shell.py~
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#!/usr/bin/python
#
# Copyright 2007 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
An interactive, stateful AJAX shell that runs Python code on the server.
Part of http://code.google.com/p/google-app-engine-samples/.
May be run as a standalone app or in an existing app as an admin-only handler.
Can be used for system administration tasks, as an interactive way to try out
APIs, or as a debugging aid during development.
The logging, os, sys, db, and users modules are imported automatically.
Interpreter state is stored in the datastore so that variables, function
definitions, and other values in the global and local namespaces can be used
across commands.
To use the shell in your app, copy shell.py, static/*, and templates/* into
your app's source directory. Then, copy the URL handlers from app.yaml into
your app.yaml.
TODO: unit tests!
"""
import logging
import new
import os
import pickle
import sys
import traceback
import types
import wsgiref.handlers
from google.appengine.api import users
from google.appengine.ext import db
from google.appengine.ext import webapp
from google.appengine.ext.webapp import template
# Set to True if stack traces should be shown in the browser, etc.
_DEBUG = True
# The entity kind for shell sessions. Feel free to rename to suit your app.
_SESSION_KIND = '_Shell_Session'
# Types that can't be pickled.
UNPICKLABLE_TYPES = (
types.ModuleType,
types.TypeType,
types.ClassType,
types.FunctionType,
)
# Unpicklable statements to seed new sessions with.
INITIAL_UNPICKLABLES = [
'import logging',
'import os',
'import sys',
'from google.appengine.ext import db',
'from google.appengine.api import users',
]
class Session(db.Model):
"""A shell session. Stores the session's globals.
Each session globals is stored in one of two places:
If the global is picklable, it's stored in the parallel globals and
global_names list properties. (They're parallel lists to work around the
unfortunate fact that the datastore can't store dictionaries natively.)
If the global is not picklable (e.g. modules, classes, and functions), or if
it was created by the same statement that created an unpicklable global,
it's not stored directly. Instead, the statement is stored in the
unpicklables list property. On each request, before executing the current
statement, the unpicklable statements are evaluated to recreate the
unpicklable globals.
The unpicklable_names property stores all of the names of globals that were
added by unpicklable statements. When we pickle and store the globals after
executing a statement, we skip the ones in unpicklable_names.
Using Text instead of string is an optimization. We don't query on any of
these properties, so they don't need to be indexed.
"""
global_names = db.ListProperty(db.Text)
globals = db.ListProperty(db.Blob)
unpicklable_names = db.ListProperty(db.Text)
unpicklables = db.ListProperty(db.Text)
def set_global(self, name, value):
"""Adds a global, or updates it if it already exists.
Also removes the global from the list of unpicklable names.
Args:
name: the name of the global to remove
value: any picklable value
"""
blob = db.Blob(pickle.dumps(value))
if name in self.global_names:
index = self.global_names.index(name)
self.globals[index] = blob
else:
self.global_names.append(db.Text(name))
self.globals.append(blob)
self.remove_unpicklable_name(name)
def remove_global(self, name):
"""Removes a global, if it exists.
Args:
name: string, the name of the global to remove
"""
if name in self.global_names:
index = self.global_names.index(name)
del self.global_names[index]
del self.globals[index]
def globals_dict(self):
"""Returns a dictionary view of the globals.
"""
return dict((name, pickle.loads(val))
for name, val in zip(self.global_names, self.globals))
def add_unpicklable(self, statement, names):
"""Adds a statement and list of names to the unpicklables.
Also removes the names from the globals.
Args:
statement: string, the statement that created new unpicklable global(s).
names: list of strings; the names of the globals created by the statement.
"""
self.unpicklables.append(db.Text(statement))
for name in names:
self.remove_global(name)
if name not in self.unpicklable_names:
self.unpicklable_names.append(db.Text(name))
def remove_unpicklable_name(self, name):
"""Removes a name from the list of unpicklable names, if it exists.
Args:
name: string, the name of the unpicklable global to remove
"""
if name in self.unpicklable_names:
self.unpicklable_names.remove(name)
class FrontPageHandler(webapp.RequestHandler):
"""Creates a new session and renders the shell.html template.
"""
def get(self):
# set up the session. TODO: garbage collect old shell sessions
session_key = self.request.get('session')
if session_key:
session = Session.get(session_key)
else:
# create a new session
session = Session()
session.unpicklables = [db.Text(line) for line in INITIAL_UNPICKLABLES]
session_key = session.put()
template_file = os.path.join(os.path.dirname(__file__), 'templates',
'shell.html')
session_url = '/?session=%s' % session_key
vars = { 'server_software': os.environ['SERVER_SOFTWARE'],
'python_version': sys.version,
'session': str(session_key),
'user': users.get_current_user(),
'login_url': users.create_login_url(session_url),
'logout_url': users.create_logout_url(session_url),
}
rendered = webapp.template.render(template_file, vars, debug=_DEBUG)
self.response.out.write(rendered)
class StatementHandler(webapp.RequestHandler):
"""Evaluates a python statement in a given session and returns the result.
"""
def get(self):
self.response.headers['Content-Type'] = 'text/plain'
# extract the statement to be run
statement = self.request.get('statement')
if not statement:
return
# the python compiler doesn't like network line endings
statement = statement.replace('\r\n', '\n')
# add a couple newlines at the end of the statement. this makes
# single-line expressions such as 'class Foo: pass' evaluate happily.
statement += '\n\n'
# log and compile the statement up front
try:
logging.info('Compiling and evaluating:\n%s' % statement)
compiled = compile(statement, '<string>', 'single')
except:
self.response.out.write(traceback.format_exc())
return
# create a dedicated module to be used as this statement's __main__
statement_module = new.module('__main__')
# use this request's __builtin__, since it changes on each request.
# this is needed for import statements, among other things.
import __builtin__
statement_module.__builtins__ = __builtin__
# load the session from the datastore
session = Session.get(self.request.get('session'))
# swap in our custom module for __main__. then unpickle the session
# globals, run the statement, and re-pickle the session globals, all
# inside it.
old_main = sys.modules.get('__main__')
try:
sys.modules['__main__'] = statement_module
statement_module.__name__ = '__main__'
# re-evaluate the unpicklables
for code in session.unpicklables:
exec code in statement_module.__dict__
# re-initialize the globals
for name, val in session.globals_dict().items():
try:
statement_module.__dict__[name] = val
except:
msg = 'Dropping %s since it could not be unpickled.\n' % name
self.response.out.write(msg)
logging.warning(msg + traceback.format_exc())
session.remove_global(name)
# run!
old_globals = dict(statement_module.__dict__)
try:
old_stdout = sys.stdout
old_stderr = sys.stderr
try:
sys.stdout = self.response.out
sys.stderr = self.response.out
exec compiled in statement_module.__dict__
finally:
sys.stdout = old_stdout
sys.stderr = old_stderr
except:
self.response.out.write(traceback.format_exc())
return
# extract the new globals that this statement added
new_globals = {}
for name, val in statement_module.__dict__.items():
if name not in old_globals or val != old_globals[name]:
new_globals[name] = val
if True in [isinstance(val, UNPICKLABLE_TYPES)
for val in new_globals.values()]:
# this statement added an unpicklable global. store the statement and
# the names of all of the globals it added in the unpicklables.
session.add_unpicklable(statement, new_globals.keys())
logging.debug('Storing this statement as an unpicklable.')
else:
# this statement didn't add any unpicklables. pickle and store the
# new globals back into the datastore.
for name, val in new_globals.items():
if not name.startswith('__'):
session.set_global(name, val)
finally:
sys.modules['__main__'] = old_main
session.put()
def main():
application = webapp.WSGIApplication(
[('/', FrontPageHandler),
('/shell.do', StatementHandler)], debug=_DEBUG)
wsgiref.handlers.CGIHandler().run(application)
if __name__ == '__main__':
main()

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tools/scripts/app_engine_server/gae_shell/static/shell.js
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// Copyright 2007 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview
* Javascript code for the interactive AJAX shell.
*
* Part of http://code.google.com/p/google-app-engine-samples/.
*
* Includes a function (shell.runStatement) that sends the current python
* statement in the shell prompt text box to the server, and a callback
* (shell.done) that displays the results when the XmlHttpRequest returns.
*
* Also includes cross-browser code (shell.getXmlHttpRequest) to get an
* XmlHttpRequest.
*/
/**
* Shell namespace.
* @type {Object}
*/
var shell = {}
/**
* The shell history. history is an array of strings, ordered oldest to
* newest. historyCursor is the current history element that the user is on.
*
* The last history element is the statement that the user is currently
* typing. When a statement is run, it's frozen in the history, a new history
* element is added to the end of the array for the new statement, and
* historyCursor is updated to point to the new element.
*
* @type {Array}
*/
shell.history = [''];
/**
* See {shell.history}
* @type {number}
*/
shell.historyCursor = 0;
/**
* A constant for the XmlHttpRequest 'done' state.
* @type Number
*/
shell.DONE_STATE = 4;
/**
* A cross-browser function to get an XmlHttpRequest object.
*
* @return {XmlHttpRequest?} a new XmlHttpRequest
*/
shell.getXmlHttpRequest = function() {
if (window.XMLHttpRequest) {
return new XMLHttpRequest();
} else if (window.ActiveXObject) {
try {
return new ActiveXObject('Msxml2.XMLHTTP');
} catch(e) {
return new ActiveXObject('Microsoft.XMLHTTP');
}
}
return null;
};
/**
* This is the prompt textarea's onkeypress handler. Depending on the key that
* was pressed, it will run the statement, navigate the history, or update the
* current statement in the history.
*
* @param {Event} event the keypress event
* @return {Boolean} false to tell the browser not to submit the form.
*/
shell.onPromptKeyPress = function(event) {
var statement = document.getElementById('statement');
if (this.historyCursor == this.history.length - 1) {
// we're on the current statement. update it in the history before doing
// anything.
this.history[this.historyCursor] = statement.value;
}
// should we pull something from the history?
if (event.ctrlKey && event.keyCode == 38 /* up arrow */) {
if (this.historyCursor > 0) {
statement.value = this.history[--this.historyCursor];
}
return false;
} else if (event.ctrlKey && event.keyCode == 40 /* down arrow */) {
if (this.historyCursor < this.history.length - 1) {
statement.value = this.history[++this.historyCursor];
}
return false;
} else if (!event.altKey) {
// probably changing the statement. update it in the history.
this.historyCursor = this.history.length - 1;
this.history[this.historyCursor] = statement.value;
}
// should we submit?
var ctrlEnter = (document.getElementById('submit_key').value == 'ctrl-enter');
if (event.keyCode == 13 /* enter */ && !event.altKey && !event.shiftKey &&
event.ctrlKey == ctrlEnter) {
return this.runStatement();
}
};
/**
* The XmlHttpRequest callback. If the request succeeds, it adds the command
* and its resulting output to the shell history div.
*
* @param {XmlHttpRequest} req the XmlHttpRequest we used to send the current
* statement to the server
*/
shell.done = function(req) {
if (req.readyState == this.DONE_STATE) {
var statement = document.getElementById('statement')
statement.className = 'prompt';
// add the command to the shell output
var output = document.getElementById('output');
output.value += '\n>>> ' + statement.value;
statement.value = '';
// add a new history element
this.history.push('');
this.historyCursor = this.history.length - 1;
// add the command's result
var result = req.responseText.replace(/^\s*|\s*$/g, ''); // trim whitespace
if (result != '')
output.value += '\n' + result;
// scroll to the bottom
output.scrollTop = output.scrollHeight;
if (output.createTextRange) {
var range = output.createTextRange();
range.collapse(false);
range.select();
}
}
};
/**
* This is the form's onsubmit handler. It sends the python statement to the
* server, and registers shell.done() as the callback to run when it returns.
*
* @return {Boolean} false to tell the browser not to submit the form.
*/
shell.runStatement = function() {
var form = document.getElementById('form');
// build a XmlHttpRequest
var req = this.getXmlHttpRequest();
if (!req) {
document.getElementById('ajax-status').innerHTML =
"<span class='error'>Your browser doesn't support AJAX. :(</span>";
return false;
}
req.onreadystatechange = function() { shell.done(req); };
// build the query parameter string
var params = '';
for (i = 0; i < form.elements.length; i++) {
var elem = form.elements[i];
if (elem.type != 'submit' && elem.type != 'button' && elem.id != 'caret') {
var value = escape(elem.value).replace(/\+/g, '%2B'); // escape ignores +
params += '&' + elem.name + '=' + value;
}
}
// send the request and tell the user.
document.getElementById('statement').className = 'prompt processing';
req.open(form.method, form.action + '?' + params, true);
req.setRequestHeader('Content-type',
'application/x-www-form-urlencoded;charset=UTF-8');
req.send(null);
return false;
};

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title> Interactive Shell </title>
<script type="text/javascript" src="/gae_shell/static/shell.js"></script>
<style type="text/css">
body {
font-family: monospace;
font-size: 10pt;
}
p {
margin: 0.5em;
}
.prompt, #output {
width: 45em;
border: 1px solid silver;
background-color: #f5f5f5;
font-size: 10pt;
margin: 0.5em;
padding: 0.5em;
padding-right: 0em;
overflow-x: hidden;
}
#toolbar {
margin-left: 0.5em;
padding-left: 0.5em;
}
#caret {
width: 2.5em;
margin-right: 0px;
padding-right: 0px;
border-right: 0px;
}
#statement {
width: 43em;
margin-left: -1em;
padding-left: 0px;
border-left: 0px;
background-position: top right;
background-repeat: no-repeat;
}
.processing {
background-image: url("/gae_shell/static/spinner.gif");
}
#ajax-status {
font-weight: bold;
}
.message {
color: #8AD;
font-weight: bold;
font-style: italic;
}
.error {
color: #F44;
}
.username {
font-weight: bold;
}
</style>
</head>
<body>
<p> Interactive server-side Python shell for
<a href="http://code.google.com/appengine/">Google App Engine</a>.
(<a href="http://code.google.com/p/google-app-engine-samples/">source</a>)
</p>
<textarea id="output" rows="22" readonly="readonly">
{{ server_software }}
Python {{ python_version }}
</textarea>
<form id="form" action="shell.do" method="get">
<nobr>
<textarea class="prompt" id="caret" readonly="readonly" rows="4"
onfocus="document.getElementById('statement').focus()"
>&gt;&gt;&gt;</textarea>
<textarea class="prompt" name="statement" id="statement" rows="4"
onkeypress="return shell.onPromptKeyPress(event);"></textarea>
</nobr>
<input type="hidden" name="session" value="{{ session }}" />
<input type="submit" style="display: none" />
</form>
<p id="ajax-status"></p>
<p id="toolbar">
{% if user %}
<span class="username">{{ user.nickname }}</span>
(<a href="{{ logout_url }}">log out</a>)
{% else %}
<a href="{{ login_url }}">log in</a>
{% endif %}
| Ctrl-Up/Down for history |
<select id="submit_key">
<option value="enter">Enter</option>
<option value="ctrl-enter" selected="selected">Ctrl-Enter</option>
</select>
<label for="submit_key">submits</label>
</p>
<script type="text/javascript">
document.getElementById('statement').focus();
</script>
</body>
</html>