From 786dd8fe18918c8dea3c48981ec744cf77a39136 Mon Sep 17 00:00:00 2001
From: Ivan Kravets <me@ikravets.com>
Date: Wed, 13 Dec 2017 01:23:18 +0200
Subject: [PATCH] Implement "--develop" option for "upgrade" command // Resolve
 #104

---
 docs                           | 2 +-
 platformio/commands/upgrade.py | 9 +++++----
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/docs b/docs
index 81346afb..a9bc3dc0 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit 81346afbf88df746faf12e7dfcc4ee4504ab8829
+Subproject commit a9bc3dc0ea0766675aaeed1aaec9527012372902
diff --git a/platformio/commands/upgrade.py b/platformio/commands/upgrade.py
index 9cbb6611..edff2456 100644
--- a/platformio/commands/upgrade.py
+++ b/platformio/commands/upgrade.py
@@ -24,12 +24,12 @@ from platformio.managers.core import update_core_packages
 
 @click.command(
     "upgrade", short_help="Upgrade PlatformIO to the latest version")
-def cli():
+@click.option("--develop", is_flag=True, help="Force development branch")
+def cli(develop):
     # Update PlatformIO's Core packages
     update_core_packages(silent=True)
 
-    latest = get_latest_version()
-    if __version__ == latest:
+    if not develop and __version__ == get_latest_version():
         return click.secho(
             "You're up-to-date!\nPlatformIO %s is currently the "
             "newest version available." % __version__,
@@ -40,7 +40,8 @@ def cli():
     # kill all PIO Home servers, they block `pioplus` binary
     shutdown_servers()
 
-    to_develop = not all([c.isdigit() for c in latest if c != "."])
+    to_develop = develop or not all(
+        [c.isdigit() for c in __version__ if c != "."])
     cmds = ([
         "pip", "install", "--upgrade",
         "https://github.com/platformio/platformio-core/archive/develop.zip"