zulip/tools/minify-js

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#!/usr/bin/env python2.7
# Minifies JavaScripts, creating source maps
from __future__ import absolute_import
from __future__ import print_function
import os
import subprocess
import optparse
import sys
import six
parser = optparse.OptionParser()
parser.add_option('--prev-deploy', nargs=1, metavar='DIR',
help='A previous deploy from which to reuse files if possible')
(options, args) = parser.parse_args()
prev_deploy = options.prev_deploy
# We have to pull out JS_SPECS, defined in our settings file, so we know what
# JavaScript source files to minify (and what output files to create).
sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
os.environ['DJANGO_SETTINGS_MODULE'] = 'zproject.settings'
from django.conf import settings
os.chdir(settings.DEPLOY_ROOT)
STATIC_PATH = 'static/'
# Compile Handlebars templates
subprocess.check_call(['tools/compile-handlebars-templates'])
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# Create webpack bundle
subprocess.check_call(['tools/webpack'])
def get_changed_source_files(other_checkout):
""" Get list of changed static files since other_checkout.
If git fails to return a reasonable looking list, this returns None,
in which case it should be assumed no files can be reused from
other_checkout. """
try:
git_dir = os.path.join(other_checkout, '.git')
old_commit_sha1 = subprocess.check_output(['git', 'rev-parse', 'HEAD'],
env={'GIT_DIR': git_dir})
old_commit_sha1 = old_commit_sha1.rstrip()
git_diff = subprocess.check_output(['git', 'diff', '--name-only',
old_commit_sha1])
except subprocess.CalledProcessError:
# If git returned an error, assume we can't reuse any files, and
# regenerate everything.
print("Warning: git returned an error when comparing to the previous")
print ("deploy in %s. Will re-minify JavaScript instead of reusing"
% (other_checkout,))
return None
changed = set()
for filename in git_diff.split('\n'):
if not filename.startswith(STATIC_PATH):
continue # Ignore non-static files.
if filename.endswith('.handlebars'):
continue
changed.add(filename)
return changed
changed_files = set()
if prev_deploy:
changed_files = get_changed_source_files(prev_deploy)
if changed_files is None:
prev_deploy = None
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# Always use the newly compiled handlebars templates and webpack bundle.
if prev_deploy:
changed_files.add(os.path.join(STATIC_PATH, 'templates/compiled.js'))
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changed_files.add(os.path.join(STATIC_PATH, 'js/bundle.js'))
JS_SPECS = settings.JS_SPECS
CLOSURE_BINARY = '/usr/bin/closure-compiler'
if not os.path.exists(CLOSURE_BINARY):
CLOSURE_BINARY = 'tools/closure-compiler/run'
if not os.path.exists(CLOSURE_BINARY):
print("closure-compiler not installed; the Vagrant provision.py installs it via apt "\
"or you can manually unpack http://dl.google.com/closure-compiler/compiler-latest.zip to tools/closure-compiler")
sys.exit(1)
# Where to put minified JS and source maps
MIN_DIR = os.path.join(STATIC_PATH, 'min/')
MAP_DIR = os.path.join(STATIC_PATH, 'source-map/')
subprocess.check_call(['mkdir', '-p', MIN_DIR, MAP_DIR])
for js_group, filespec in six.iteritems(JS_SPECS):
# JS_SPECS look like 'js/foobar.js'.
# changed_files look like 'static/js/foobar.js'.
# So we prepend 'static/' to the JS_SPECS so these match up.
in_files = [os.path.join(STATIC_PATH, filename)
for filename in filespec['source_filenames']]
out_file = os.path.join(MIN_DIR, os.path.basename(filespec['output_filename']))
map_file = os.path.join(MAP_DIR, os.path.basename(filespec['output_filename'])
+ '.map')
if (not 'force_minify' in filespec) and (prev_deploy and len(set(in_files) & changed_files) == 0):
# Try to reuse the output file from previous deploy
try:
for dest in [out_file, map_file]:
src = os.path.join(prev_deploy, dest)
os.path.getsize(src) # Just to throw error if it doesn't exist.
if os.path.abspath(src) != os.path.abspath(dest):
subprocess.check_call(['cp', src, dest])
continue # Copy succeeded, so go on to next file.
except (subprocess.CalledProcessError, OSError):
pass # Copy failed, so fall through to minification instead.
# No previous deploy, or a source file has changed, or copying was
# supposed to work but failed. Thus, minify the JS anew.
# (N.B. we include STATIC_HEADER_FILE before the JavaScripts.
# This way it doesn't throw off the source map.)
cmd = '%s --language_in ECMASCRIPT5 --create_source_map %s %s %s' % (
CLOSURE_BINARY, map_file,
settings.STATIC_HEADER_FILE, ' '.join(in_files))
js = subprocess.check_output(cmd, shell=True)
# Write out the JS
with open(out_file, 'w') as fp:
fp.write(js)