def ns2metadata(ns):
"""
Python Namespace (with a ``Metadata`` class) to a "metadata object".
A metadata object is a common dictionary instance with an ``uri`` attribute.
"""
mdict = vars(ns["Metadata"])
fname = os.path.splitext(os.path.split(ns["__file__"])[1])[0]
mdata = OrderedDict()
mdata.uri = mdict["uri"]
# Plugin LV2 class (SpectralPlugin, UtilityPlugin, DelayPlugin, etc.)
mdata["a"] = ["lv2:Plugin"]
if "lv2class" in mdict:
classes = mdict["lv2class"]
if not isinstance(classes, (tuple, list)):
classes = [classes]
for cls in classes:
if not cls.startswith("lv2:"):
cls = "lv2:" + cls
if not cls.endswith("Plugin"):
cls = cls + "Plugin"
if cls not in mdata["a"]:
mdata["a"].append(cls)
# Default output filename
mdata["lv2:binary"] = ["<{}.so>".format(fname)]
# Default port assignment
mdata["lv2:port"] = [
OrderedDict([
("a", ["lv2:AudioPort", "lv2:InputPort"]),
("lv2:index", [0]),
("lv2:symbol", ['"In"']),
("lv2:name", ['"In"']),
]),
OrderedDict([
("a", ["lv2:AudioPort", "lv2:OutputPort"]),
("lv2:index", [1]),
("lv2:symbol", ['"Out"']),
("lv2:name", ['"Out"']),
]),
]
# Plugin name (required by LV2), can't build the plugin without it
mdata["doap:name"] = [mdict["name"].join('""')]
# Author as both the developer and maintainer in one single metadata
if "author" in mdict:
mdata.setdefault("doap:developer", OrderedDict())["foaf:name"] = \
mdata.setdefault("doap:maintainer", OrderedDict())["foaf:name"] = \
['"{}"'.format(mdict["author"])]
if "author_homepage" in mdict:
mdata.setdefault("doap:developer", OrderedDict())["foaf:homepage"] = \
mdata.setdefault("doap:maintainer", OrderedDict())["foaf:homepage"] = \
["<{}>".format(mdict["author_homepage"])]
if "author_email" in mdict:
mdata.setdefault("doap:developer", OrderedDict())["foaf:mbox"] = \
mdata.setdefault("doap:maintainer", OrderedDict())["foaf:mbox"] = \
["<mailto:{}>".format(mdict["author_email"])]
# Add the small license acronym (when available)
if "license" in mdict:
mdata["doap:license"] = ["<{}>".format(mdict["license"])]
# Last information to add: the comment from the docstring
plugin_docstring = ns.get("__doc__", None)
if plugin_docstring:
mdata["rdfs:comment"] = ['"""{}"""'.format(plugin_docstring)]
return mdata
