def install(self, arg, mode='recur', force=False, forceall=False):
req = req_from_anything(arg)
# resolve the list of eggs that need to be installed
self._connect()
resolver = Resolve(self.remote, self.verbose)
eggs = resolver.install_sequence(req, mode)
if eggs is None:
raise EnpkgError("No egg found for requirement '%s'." % req)
if not forceall:
# remove already installed eggs from egg list
rm = lambda eggs: [e for e in eggs if self.find(e) is None]
if force:
eggs = rm(eggs[:-1]) + [eggs[-1]]
else:
eggs = rm(eggs)
# fetch eggs
for egg in eggs:
self.fetch(egg, force or forceall)
if not self.hook:
# remove packages with the same name (from first egg collection
# only, in reverse install order)
for egg in reversed(eggs):
try:
self.remove(Req(name_egg(egg)))
except EnpkgError:
pass
# install eggs
for egg in eggs:
extra_info = {}
repo = self.remote.where_from(egg)
if repo:
extra_info['repo_dispname'] = repo.info()['dispname']
self.ec.install(egg, self.local_dir, extra_info)
return len(eggs)
