--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/python/install.py	Thu Jan 13 11:24:31 2011 -0800
@@ -0,0 +1,36 @@
+def install_hg(sources):
+    """
+    - sources : dict of hg sources to install: {'package': 'http://hg...'}
+    """
+    try:
+        from subprocess import check_call as call
+    except:
+        from subprocess import call
+
+    # see if you can find site-packages
+    import site
+    site_dir = os.path.abspath(os.path.dirname(site.__file__))
+    site_packages = os.path.join(site_dir, 'site-packages')
+    if not (os.path.exists(site_packages) and os.path.isdir(site_packages)):
+        raise IOError("Cannot find site-packages directory")
+
+    # figure out what you need to install
+    missing = set()
+    for source in sources:
+        try:
+            __import__(source)
+        except ImportError:
+            missing.add(source)
+
+    # install it
+    for source in missing:
+        call(['hg', 'clone', sources[source],
+              os.path.join(site_packages, source)])
+
+### install unpackaged dependencies
+if set(['install', 'develop']).intersection(sys.argv[1:]):
+    try:
+        install_hg(source)
+    except:
+        print 'Please make sure the source is installed:'
+        print source