scan metadata for targets

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

cargodeps.py

@@ -6,6 +6,7 @@ from rust2rpm import Metadata
 def main():
     parser = argparse.ArgumentParser()
     group = parser.add_mutually_exclusive_group(required=True)
+    group.add_argument("-t", "--target-kinds", action="store_true", help="Print target kinds")
     group.add_argument("-P", "--provides", action="store_true", help="Print Provides")
     group.add_argument("-R", "--requires", action="store_true", help="Print Requires")
     group.add_argument("-C", "--conflicts", action="store_true", help="Print Conflicts")
@@ -25,6 +26,8 @@ def main():
     for f in files:
         f = f.rstrip()
         md = Metadata.from_file(f)
+        if args.target_kinds:
+            print("\n".join(set(tgt.kind for tgt in md.targets)))
         if args.provides:
             print_deps(md.provides)
         if args.requires:

rust2rpm/metadata.py

@@ -11,6 +11,14 @@ REQ_TO_CON = {">": "<=",
               ">=": "<",
               "<=": ">"}
 
+class Target(object):
+    def __init__(self, kind, name):
+        self.kind = kind
+        self.name = name
+
+    def __repr__(self):
+        return "<Target {self.kind}|{self.name}>".format(self=self)
+
 class Dependency(object):
     def __init__(self, name, spec, feature=None, inverted=False):
         self.name = name
@@ -32,6 +40,7 @@ class Metadata(object):
         self.license = None
         self.license_file = None
         self._version = None
+        self._targets = []
         self._provides = []
         self._requires = []
         self._conflicts = []
@@ -50,6 +59,9 @@ class Metadata(object):
         self.license_file = md["license_file"]
         self._version = semver.SpecItem("={}".format(md["version"]))
 
+        # Targets
+        self._targets = [Target(tgt["kind"][0], tgt["name"]) for tgt in md["targets"]]
+
         # Provides
         self._provides = [Dependency(self.name, self._version)]
         for feature in md["features"]:
@@ -131,6 +143,10 @@ class Metadata(object):
     def version(self):
         return str(self._version.spec) if self._version is not None else None
 
+    @property
+    def targets(self):
+        return self._targets[:]
+
     @property
     def provides(self):
         return self._provides[:]