serve.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import mimetypes, sys
import datetime
from os import curdir, sep
from os.path import splitext
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
import codecs

try:
	from jinja2 import Template, Environment, FileSystemLoader, nodes
	from jinja2.ext import Extension
except ImportError:
	print "Jinja template engine is not installed. Fix this with `pip install jinja2`"
	exit(1)

DEBUG = True
TEMPLATE_DEBUG = True

jinja_env = Environment(extensions=[])

def do_indent_tabs(s, width=1, indentfirst=False, usetabs=False):
	"""
	Yoinked from Jinja2 source. thx babes.
	"""
	tab = u'\t'
	if usetabs == False:
		tab = ' '
	indention = tab * width
	rv = (u'\n' + indention).join(s.splitlines())
	if indentfirst:
		rv = indention + rv
	return rv

jinja_globals = {}
jinja_env.loader = FileSystemLoader('.')
jinja_env.filters['indent'] = do_indent_tabs

server_port = 8080

# Could come in handy.
jinja_globals["current_year"] = datetime.datetime.now().year
jinja_globals["current_datestamp"] = datetime.datetime.now()

jinja_env.globals.update(jinja_globals)

class JinjaHandler(BaseHTTPRequestHandler):
	def do_GET(self):
		try:
			path = self.path

			if path.endswith('/'):
				path += 'index.html'

			path = _path = path.strip('/')
			_path = list(path.rpartition('/')) # I LOVE YOU RPARTITION
			save_as_file = False

			if (_path[2].endswith('.html') or _path[2].endswith('.xml')) and not _path[2].startswith('_'):
				_path[2] = '_' + _path[2]
				save_as_file = True

			_path = ''.join(_path)

			# Open the _source file
			source_file = codecs.open(curdir + sep + _path, "r")

			self.send_response(200)
			self.send_header('Content-type', mimetypes.guess_type(path)[0])
			self.end_headers()

			jinja_env.globals.update({"path":path})

			if( save_as_file ):
				template = jinja_env.from_string(source_file.read().decode('utf8')).render().encode('utf-8')
				# Non-ASCII decoration. FIGHT ME.

				# template += ("\n\n"
				# "<!-- ┌──────────────────────────────────────────────────────┐ -->\n"
				# "<!-- │ Rendered with serve.py on %s │ -->\n"
				# "<!-- └──────────────────────────────────────────────────────┘ -->\n") % datetime.datetime.now()

				self.wfile.write( template )

				destination_file = open( curdir + sep + path, 'w' )
				destination_file.write(template)
				destination_file.close()
			else:
				self.wfile.write(source_file.read())

			source_file.close()

			return
		except IOError, e:
			import traceback, os.path
			top = traceback.extract_stack()[-1]
			self.wfile.write(
				"<code>Error: %s<br>Details: %s</code>" %
				(
					type(e).__name__,
					# os.path.basename(top[0]),
					# str(top[1]),
					e
				)
			)

			return
			# self.send_error(404,'File Not Found: %s' % self.path)

if __name__ == '__main__':
	if (len(sys.argv) > 1):
		try:
			sys.argv[1] = int( sys.argv[1] )
			server_port = sys.argv[1]
		except:
			print "Invalid port number:", sys.argv[1]
			exit(1)

	try:
		httpd = HTTPServer(('',server_port), JinjaHandler)
		print 'Server started on port %d, press Ctrl-C to stop' % server_port
		httpd.serve_forever()
	except KeyboardInterrupt:
		print "\nShutting down..."
		httpd.socket.close()

Thanks so much for this tutorial 👍 , btw can you give me a simply how to add the context?
Example:

template = jinja_env.from_string(source_file.read().decode('utf8')).render().encode('utf-8')
self.wfile.write( template, {'awesome': 'This value of awesome'} ) #it will be an error because `template` is string, how to add it?

and then in the template:

{% if awesome %}
    {{ awesome }}
{% endif %}