Improve platform auto-installing (especially for @SmartAthill)

platformio/__init__.py

@@ -1,7 +1,7 @@
 # Copyright (C) Ivan Kravets <me@ikravets.com>
 # See LICENSE for details.
 
-VERSION = (2, 2, "1a0")
+VERSION = (2, 2, "1a1")
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"

platformio/commands/run.py

@@ -163,7 +163,7 @@ class EnvironmentProcessor(object):
         telemetry.on_run_environment(self.options, build_targets)
 
         # install platform and libs dependencies
-        _autoinstall_platform(self.cmd_ctx, platform)
+        _autoinstall_platform(self.cmd_ctx, platform, build_targets)
         if "lib_install" in self.options:
             _autoinstall_libs(self.cmd_ctx, self.options['lib_install'])
 
@@ -171,14 +171,34 @@ class EnvironmentProcessor(object):
         return p.run(build_vars, build_targets, self.verbose_level)
 
 
-def _autoinstall_platform(ctx, platform):
+def _autoinstall_platform(ctx, platform, targets):
     installed_platforms = PlatformFactory.get_platforms(
         installed=True).keys()
-    if (platform not in installed_platforms and (
-            not app.get_setting("enable_prompts") or
+    cmd_options = {}
+    p = PlatformFactory.newPlatform(platform)
+
+    if "uploadlazy" in targets:
+        upload_tools = p.pkg_aliases_to_names(["uploader"])
+
+        # platform without uploaders
+        if not upload_tools and platform in installed_platforms:
+            return
+        # uploaders are already installed
+        if set(upload_tools) <= set(p.get_installed_packages()):
+            return
+
+        cmd_options['skip_default_package'] = True
+        if upload_tools:
+            cmd_options['with_package'] = ["uploader"]
+
+    elif (set(p.pkg_aliases_to_names(["toolchain"])) <=
+          set(p.get_installed_packages())):
+            return
+
+    if (not app.get_setting("enable_prompts") or
             click.confirm("The platform '%s' has not been installed yet. "
-                          "Would you like to install it now?" % platform))):
-        ctx.invoke(cmd_platforms_install, platforms=[platform])
+                          "Would you like to install it now?" % platform)):
+        ctx.invoke(cmd_platforms_install, platforms=[platform], **cmd_options)
 
 
 def _autoinstall_libs(ctx, libids_list):