From 9ead140b6e2c57e971e77fffa81f0c1c18eef9ad Mon Sep 17 00:00:00 2001
From: Ivan Kravets <me@ikravets.com>
Date: Sun, 5 Oct 2014 23:34:40 +0300
Subject: [PATCH] Fix lib update crashing when no libs are installed (resolve
 issue #19)

---
 HISTORY.rst                | 1 +
 platformio/commands/lib.py | 7 +++++--
 platformio/libmanager.py   | 2 ++
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/HISTORY.rst b/HISTORY.rst
index 28e6f71e..b20c9b45 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -6,6 +6,7 @@ Release History
 
 * Fixed bug with order for includes in conversation from INO/PDE to CPP
 * Automatic detection of port on upload (`issue #15 <https://github.com/ivankravets/platformio/issues/15>`_)
+* Fixed lib update crashing when no libs are installed (`issue #19 <https://github.com/ivankravets/platformio/issues/19>`_)
 
 
 0.7.0 (2014-09-24)
diff --git a/platformio/commands/lib.py b/platformio/commands/lib.py
index 9de31be2..07aef25a 100644
--- a/platformio/commands/lib.py
+++ b/platformio/commands/lib.py
@@ -140,9 +140,12 @@ def lib_show(name):
 @cli.command("update", short_help="Update installed libraries")
 def lib_update():
     lm = LibraryManager(get_lib_dir())
-    lib_names = lm.get_installed()
-    versions = get_api_result("/lib/version/" + ",".join(lib_names))
 
+    lib_names = lm.get_installed()
+    if not lib_names:
+        return
+
+    versions = get_api_result("/lib/version/" + ",".join(lib_names))
     for name in lib_names:
         info = lm.get_info(name)
 
diff --git a/platformio/libmanager.py b/platformio/libmanager.py
index 2fb4a185..4a522d78 100644
--- a/platformio/libmanager.py
+++ b/platformio/libmanager.py
@@ -33,6 +33,8 @@ class LibraryManager(object):
 
     def get_installed(self):
         items = []
+        if not isdir(self.lib_dir):
+            return items
         for item in listdir(self.lib_dir):
             conf_path = join(self.lib_dir, item, self.CONFIG_NAME)
             if isfile(conf_path):