add code which searches for updates on pypi.python.org

this uses the xmlrpc interface on pypi.python.org in order to find
updates. It depends on setuptools or distribute to be installed and
uses pip to download updates.

MANIFEST.in

@@ -9,6 +9,7 @@ include pypiserver/__init__.py
 include pypiserver/__main__.py
 include pypiserver/bottle.py
 include pypiserver/core.py
+include pypiserver/manage.py
 include setup.cfg
 include setup.py
 include tests/test_app.py

pypiserver/manage.py

@@ -0,0 +1,82 @@
+
+import sys, os, xmlrpclib, pkg_resources
+from pypiserver import core
+
+
+class pkgfile(object):
+    def __init__(self, path):
+        self.path = path
+        self.pkgname, self.version = core.guess_pkgname_and_version(path)
+        self.version_info = pkg_resources.parse_version(self.version)
+
+
+def find_updates(pkgset):
+    def write(s):
+        sys.stdout.write(s)
+        sys.stdout.flush()
+
+    pypi = xmlrpclib.Server("http://pypi.python.org/pypi/")
+    pkgname2latest = {}
+
+    pkgfiles = [pkgfile(x) for x in pkgset.find_packages()]
+
+    for x in pkgfiles:
+        if x.pkgname not in pkgname2latest:
+            pkgname2latest[x.pkgname] = x
+        elif x.version_info > pkgname2latest[x.pkgname].version_info:
+            pkgname2latest[x.pkgname] = x
+
+    need_update = []
+
+    print "checking %s packages for newer version" % len(pkgname2latest),
+    for count, (pkgname, file) in enumerate(pkgname2latest.items()):
+        if count % 40 == 0:
+            write("\n")
+
+        releases = pypi.package_releases(pkgname)
+
+        releases = [(pkg_resources.parse_version(x), x) for x in releases]
+        do_update = False
+        if releases:
+            m = max(releases)
+            if m[0] > file.version_info:
+                file.latest_version = m[1]
+                do_update = True
+                # print "%s needs update from %s to %s" % (pkgname, file.version, m[1])
+                need_update.append(file)
+        if do_update:
+            write("U")
+        else:
+            write(".")
+
+    write("\n\n")
+
+    return need_update
+
+
+def update(pkgset, destdir=None, dry_run=False):
+    need_update = find_updates(pkgset)
+    for x in need_update:
+        print "# updating", x.pkgname, x.version, x.latest_version
+
+        cmd = ["pip", "-q", "install", "-i", "http://pypi.python.org/simple",
+               "-d", destdir or os.path.dirname(os.path.join(pkgset.root, x.path)),
+               "%s==%s" % (x.pkgname, x.latest_version)]
+        print " ".join(cmd)
+        print
+        if not dry_run:
+            os.spawnlp(os.P_WAIT, cmd[0], *cmd)
+
+
+def main():
+    root = sys.argv[1]
+    if len(sys.argv) > 2:
+        destdir = sys.argv[2]
+    else:
+        destdir = None
+
+    update(core.pkgset(root), destdir, True)
+
+
+if __name__ == "__main__":
+    main()