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import sys
import os
from scrapy.xlib.pydispatch import dispatcher
from scrapy.contrib.exporter import XmlItemExporter
from scrapy.command import ScrapyCommand
from scrapy.core.manager import scrapymanager
from scrapy.core import signals
def _import_file(filepath):
abspath = os.path.abspath(filepath)
dirname, file = os.path.split(abspath)
fname, fext = os.path.splitext(file)
if fext != '.py':
raise ValueError("Only Python files supported: %s" % abspath)
if dirname:
sys.path = [dirname] + sys.path
try:
module = __import__(fname, {}, {}, [''])
finally:
if dirname:
sys.path.pop(0)
return module
class Command(ScrapyCommand):
requires_project = False
def syntax(self):
return "[options] <spider_file>"
def short_desc(self):
return "Run a spider"
def long_desc(self):
return "Run the spider defined in the given file. The file must be a " \
"Python module which defines a SPIDER variable with a instance of " \
"the spider to run."
def add_options(self, parser):
super(Command, self).add_options(parser)
parser.add_option("--output", dest="output", metavar="FILE",
help="store scraped items to FILE in XML format")
def run(self, args, opts):
if len(args) != 1:
return False
if opts.output:
file = open(opts.output, 'w+b')
exporter = XmlItemExporter(file)
dispatcher.connect(exporter.export_item, signal=signals.item_passed)
exporter.start_exporting()
module = _import_file(args[0])
scrapymanager.runonce(module.SPIDER)
if opts.output:
exporter.finish_exporting()
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