update.py

#!/usr/bin/python2.6

import httplib, json, os, urllib, shutil, subprocess, sys

minified_css_file = 'style.css'
minified_js_file = 'script.js'

upstream_svn = 'http://trace-viewer.googlecode.com/svn/trunk/'

script_dir = os.path.dirname(os.path.abspath(sys.argv[0]))
trace_viewer_dir = os.path.join(script_dir, 'trace-viewer')

# Remove the old source
shutil.rmtree(trace_viewer_dir, True)

# Pull the latest source from the upstream svn
svn_co_args = ['svn', 'co', upstream_svn, trace_viewer_dir]
p = subprocess.Popen(svn_co_args, stdout=subprocess.PIPE)
svn_output = ''
while p.poll() is None:
  svn_output += p.stdout.read()
if p.returncode != 0:
  print 'Failed to checkout source from upstream svn.'
  sys.exit(1)

# Update the UPSTREAM_REVISION file
rev_str = svn_output.split('\n')[-2]
if not rev_str.startswith('Checked out revision '):
  print 'Unrecognized revision string: %q' % rev_str
open('UPSTREAM_REVISION', 'wt').write(rev_str[21:-1] + '\n')

# Generate the flattened JS and CSS
build_dir = os.path.join(trace_viewer_dir, 'build')
sys.path.append(build_dir)
gen = __import__('generate_standalone_timeline_view', {}, {})
js_code = gen.generate_js()
css_code = gen.generate_css()

# Define the parameters for the POST request and encode them in
# a URL-safe format.
params = urllib.urlencode([
  ('js_code', js_code),
  ('language', 'ECMASCRIPT5'),
  ('compilation_level', 'SIMPLE_OPTIMIZATIONS'),
  ('output_format', 'json'),
  ('output_info', 'errors'),
  ('output_info', 'compiled_code'),
])

# Always use the following value for the Content-type header.
headers = { "Content-type": "application/x-www-form-urlencoded" }
conn = httplib.HTTPConnection('closure-compiler.appspot.com')
conn.request('POST', '/compile', params, headers)
response = conn.getresponse()
data = response.read()
conn.close

if response.status != 200:
  print sys.stderr, "error returned from JS compile service: %d" % response.status
  sys.exit(1)

result = json.loads(data)
if 'errors' in result:
  print 'Encountered error minifying Javascript.  Writing intermediate code to flat_script.js'
  open('flat_script.js', 'wt').write(js_code)
  for e in result['errors']:
    filenum = int(e['file'][6:])
    filename = 'flat_script.js'
    lineno = e['lineno']
    charno = e['charno']
    err = e['error']
    print '%s:%d:%d: %s' % (filename, lineno, charno, err)
  print 'Failed to generate %s.' % minified_js_file
  sys.exit(1)

open(minified_js_file, 'wt').write(result['compiledCode'] + '\n')
print 'Generated %s' % minified_js_file

yuic_args = ['yui-compressor', '--type', 'css', '-o', minified_css_file]
p = subprocess.Popen(yuic_args, stdin=subprocess.PIPE)
p.communicate(input=css_code)
if p.wait() != 0:
  print 'Failed to generate %s.' % minified_css_file
  sys.exit(1)

print 'Generated %s' % minified_css_file