Implemented new commands: list, show, uninstall & update; minor improvements to code

platformio/commands/uninstall.py

@@ -0,0 +1,21 @@
+# Copyright (C) Ivan Kravets <me@ikravets.com>
+# See LICENSE for details.
+
+from click import argument, command, secho
+
+from platformio.exception import PlatformNotInstalledYet
+from platformio.pkgmanager import PackageManager
+from platformio.platforms._base import PlatformFactory
+
+
+@command("uninstall", short_help="Uninstall the platforms")
+@argument("platform")
+def cli(platform):
+
+    if platform not in PackageManager.get_installed():
+        raise PlatformNotInstalledYet(platform)
+
+    p = PlatformFactory().newPlatform(platform)
+    if p.uninstall():
+        secho("The platform '%s' has been successfully "
+              "uninstalled!" % platform, fg="green")