Resolve #8: Implement "upgrade" command and "auto-check" for the latest version

platformio/commands/upgrade.py

@@ -0,0 +1,30 @@
+# Copyright (C) Ivan Kravets <me@ikravets.com>
+# See LICENSE for details.
+
+from click import command, secho
+from requests import get
+
+from platformio import __version__
+from platformio.exception import GetLatestVersionError
+from platformio.util import exec_command
+
+
+@command("upgrade", short_help="Upgrade PlatformIO to the latest version")
+def cli():
+    try:
+        last = get_latest_version()
+    except:
+        raise GetLatestVersionError()
+
+    if __version__ == last:
+        return secho("You're up-to-date!\nPlatformIO %s is currently the "
+                     "newest version available." % __version__, fg="green")
+    else:
+        result = exec_command(["pip", "install", "--upgrade", "platformio"])
+        secho(result['out'], fg="green")
+        secho(result['err'], fg="red")
+
+
+def get_latest_version():
+    pkgdata = get("https://pypi.python.org/pypi/platformio/json").json()
+    return pkgdata['info']['version']