Rework the Makefiles to be compatible with binary packages.

generator/nanopb_generator.py

@@ -15,10 +15,17 @@ except:
     print
     raise
 
-import proto.nanopb_pb2 as nanopb_pb2
-import proto.descriptor_pb2 as descriptor
-
-
+try:
+    import proto.nanopb_pb2 as nanopb_pb2
+    import proto.descriptor_pb2 as descriptor
+except:
+    print
+    print "********************************************************************"
+    print "*** Failed to import the protocol definitions for generator.     ***"
+    print "*** You have to run 'make' in the nanopb/generator/proto folder. ***"
+    print "********************************************************************"
+    print
+    raise
 
 
 # ---------------------------------------------------------------------------
@@ -1031,7 +1038,7 @@ def main_plugin():
 
 if __name__ == '__main__':
     # Check if we are running as a plugin under protoc
-    if 'protoc-gen-' in sys.argv[0]:
+    if 'protoc-gen-' in sys.argv[0] or '--protoc-plugin' in sys.argv:
         main_plugin()
     else:
         main_cli()

generator/protoc-gen-nanopb

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# This file is used to invoke nanopb_generator.py as a plugin
+# to protoc on Linux and other *nix-style systems.
+# Use it like this:
+# protoc --plugin=nanopb=..../protoc-gen-nanopb --nanopb_out=dir foo.proto
+#
+# Note that if you use the binary package of nanopb, the protoc
+# path is already set up properly and there is no need to give
+# --plugin= on the command line.
+
+exec python $(dirname $0)/nanopb_generator.py --protoc-plugin

generator/protoc-gen-nanopb.bat

@@ -0,0 +1,11 @@
+:: This file is used to invoke nanopb_generator.py as a plugin
+:: to protoc on Windows.
+:: Use it like this:
+:: protoc --plugin=nanopb=..../protoc-gen-nanopb.bat --nanopb_out=dir foo.proto
+::
+:: Note that if you use the binary package of nanopb, the protoc
+:: path is already set up properly and there is no need to give
+:: --plugin= on the command line.
+
+set mydir=%~dp0
+python %mydir%\nanopb_generator.py --protoc-plugin