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render_utils.py
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render_utils.py
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#!/usr/bin/env python
import glob
import os
import time
import urllib
from cssmin import cssmin
from flask import Markup, g, render_template, request
from slimit import minify
import app_config
import copytext
CSS_HEADER = '''
/*
* Looking for the full, uncompressed source? Try here:
*
* https://github.com/nprapps/%s
*/
''' % app_config.REPOSITORY_NAME
JS_HEADER = '''
/*
* Looking for the full, uncompressed source? Try here:
*
* https://github.com/nprapps/%s
*/
''' % app_config.REPOSITORY_NAME
class Includer(object):
"""
Base class for Javascript and CSS psuedo-template-tags.
"""
def __init__(self):
self.includes = []
self.tag_string = None
def push(self, path):
self.includes.append(path)
return ""
def _compress(self):
raise NotImplementedError()
def _relativize_path(self, path):
relative_path = path
depth = len(request.path.split('/')) - 2
while depth > 0:
relative_path = '../%s' % relative_path
depth -= 1
return relative_path
def render(self, path):
if getattr(g, 'compile_includes', False):
# Add a timestamp to the rendered filename to prevent caching
timestamp = int(time.time())
front, back = path.rsplit('.', 1)
path = '%s.%i.%s' % (front, timestamp, back)
out_path = 'www/%s' % path
# Delete old rendered versions, just to be tidy
old_versions = glob.glob('%s.*.%s' % (front, back))
for f in old_versions:
os.remove(f)
if out_path not in g.compiled_includes:
print 'Rendering %s' % out_path
with open(out_path, 'w') as f:
f.write(self._compress().encode('utf-8'))
# See "fab render"
g.compiled_includes.append(out_path)
markup = Markup(self.tag_string % self._relativize_path(path))
else:
response = ','.join(self.includes)
response = '\n'.join([
self.tag_string % self._relativize_path(src) for src in self.includes
])
markup = Markup(response)
del self.includes[:]
return markup
class JavascriptIncluder(Includer):
"""
Psuedo-template tag that handles collecting Javascript and serving appropriate clean or compressed versions.
"""
def __init__(self):
Includer.__init__(self)
self.tag_string = '<script type="text/javascript" src="%s"></script>'
def _compress(self):
output = []
src_paths = []
for src in self.includes:
src_paths.append('www/%s' % src)
with open('www/%s' % src) as f:
print '- compressing %s' % src
output.append(minify(f.read().encode('utf-8')))
context = make_context()
context['paths'] = src_paths
header = render_template('_js_header.js', **context)
output.insert(0, header)
return '\n'.join(output)
class CSSIncluder(Includer):
"""
Psuedo-template tag that handles collecting CSS and serving appropriate clean or compressed versions.
"""
def __init__(self):
Includer.__init__(self)
self.tag_string = '<link rel="stylesheet" type="text/css" href="%s" />'
def _compress(self):
output = []
src_paths = []
for src in self.includes:
if src.endswith('less'):
src_paths.append('%s' % src)
src = src.replace('less', 'css') # less/example.less -> css/example.css
src = '%s.less.css' % src[:-4] # css/example.css -> css/example.less.css
else:
src_paths.append('www/%s' % src)
with open('www/%s' % src) as f:
print '- compressing %s' % src
output.append(cssmin(f.read().encode('utf-8')))
context = make_context()
context['paths'] = src_paths
header = render_template('_css_header.css', **context)
output.insert(0, header)
return '\n'.join(output)
def flatten_app_config():
"""
Returns a copy of app_config containing only
configuration variables.
"""
config = {}
# Only all-caps [constant] vars get included
for k, v in app_config.__dict__.items():
if k.upper() == k:
config[k] = v
return config
def make_context():
"""
Create a base-context for rendering views.
Includes app_config and JS/CSS includers.
"""
context = flatten_app_config()
context['COPY'] = copytext.Copy()
context['JS'] = JavascriptIncluder()
context['CSS'] = CSSIncluder()
return context
def urlencode_filter(s):
"""
Filter to urlencode strings.
"""
if type(s) == 'Markup':
s = s.unescape()
# Evaulate COPY elements
if type(s) is not unicode:
s = unicode(s)
s = s.encode('utf8')
s = urllib.quote_plus(s)
return Markup(s)