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from scrapy.command import ScrapyCommand
from scrapy.utils.conf import arglist_to_dict
from scrapy.exceptions import UsageError
class Command(ScrapyCommand):
requires_project = True
def syntax(self):
return "[options] <spider>"
def short_desc(self):
return "Start crawling from a spider or URL"
def add_options(self, parser):
ScrapyCommand.add_options(self, parser)
parser.add_option("-a", dest="spargs", action="append", default=[], metavar="NAME=VALUE", \
help="set spider argument (may be repeated)")
parser.add_option("-o", "--output", metavar="FILE", \
help="dump scraped items into FILE (use - for stdout)")
parser.add_option("-t", "--output-format", metavar="FORMAT", default="jsonlines", \
help="format to use for dumping items with -o (default: %default)")
def process_options(self, args, opts):
ScrapyCommand.process_options(self, args, opts)
try:
opts.spargs = arglist_to_dict(opts.spargs)
except ValueError:
raise UsageError("Invalid -a value, use -a NAME=VALUE", print_help=False)
if opts.output:
if opts.output == '-':
self.settings.overrides['FEED_URI'] = 'stdout:'
else:
self.settings.overrides['FEED_URI'] = opts.output
self.settings.overrides['FEED_FORMAT'] = opts.output_format
def run(self, args, opts):
if len(args) < 1:
raise UsageError()
elif len(args) > 1:
raise UsageError("running 'scrapy crawl' with more than one spider is no longer supported")
for spname in args:
spider = self.crawler.spiders.create(spname, **opts.spargs)
self.crawler.crawl(spider)
self.crawler.start()
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