Fix handling of extras in add command in some cases

poetry/console/commands/init.py

@@ -425,6 +425,11 @@ The <c1>init</c1> command creates a basic <comment>pyproject.toml</> file in the
             require = OrderedDict()
             require = OrderedDict()
             if " " in pair:
             if " " in pair:
                 name, version = pair.split(" ", 2)
                 name, version = pair.split(" ", 2)
+                extras_m = re.search(r"\[([\w\d,-_]+)\]$", name)
+                if extras_m:
+                    extras = [e.strip() for e in extras_m.group(1).split(",")]
+                    name, _ = name.split("[")
+
                 require["name"] = name
                 require["name"] = name
                 if version != "latest":
                 if version != "latest":
                     require["version"] = version
                     require["version"] = version

tests/console/commands/test_add.py

@@ -109,7 +109,7 @@ def test_add_constraint_with_extras(app, repo, installer):
     repo.add_package(cachy1)
     repo.add_package(cachy1)
     repo.add_package(get_package("msgpack-python", "0.5.3"))
     repo.add_package(get_package("msgpack-python", "0.5.3"))
 
 
-    tester.execute("cachy[msgpack]^0.1.0")
+    tester.execute("cachy[msgpack]>=0.1.0,<0.2.0")
 
 
     expected = """\
     expected = """\