use CmakeLists scope to generate te XML file

- the only difference really is, that scope (the configuration.cmake) is already passed
  to px_process_params via the argument --scope. The Paths in --scope are evaluated w.r.t
  the path to src provided via the -s /--src-path argument.
- if no --scope is proveided. the Old scheme by simply walking the full --src-path directory
  is applied

Tools/px_process_params.py

@@ -50,7 +50,10 @@ from __future__ import print_function
 import sys
 import os
 import argparse
-from px4params import srcscanner, srcparser, xmlout, dokuwikiout, dokuwikirpc
+from px4params import srcscanner, srcparser, xmlout, dokuwikiout, dokuwikirpc, scope, cmakeparser
+
+import re
+import codecs
 
 def main():
     # Parse command line arguments
@@ -108,6 +111,8 @@ def main():
                         default="Automagically updated parameter documentation from code.",
                         help="DokuWiki page edit summary")
     parser.add_argument('-v', '--verbose', action='store_true', help="verbose output")
+    parser.add_argument('--scope', default=None, action='store', help="pass the scope (list of compiled modules)")
+
     args = parser.parse_args()
 
     # Check for valid command
@@ -122,8 +127,28 @@ def main():
 
     # Scan directories, and parse the files
     if (args.verbose): print("Scanning source path " + args.src_path)
-    if not scanner.ScanDir(args.src_path, parser):
-        sys.exit(1)
+    
+    use_scope = False
+    cmake_scope = scope.Scope();
+    
+    if args.scope:
+        with codecs.open(args.scope, 'r', 'utf-8') as f:
+            try:
+                contents = f.read()
+                f.close()
+                cmake_parser = cmakeparser.CMakeParser()
+                cmake_parser.Parse(cmake_scope, contents)
+                use_scope = True
+            except:
+                use_scope = False
+                pass
+    if use_scope:
+        print(cmake_scope.scope)
+        if not scanner.ScanDir([os.path.join(args.src_path, p) for p in cmake_scope.scope], parser):
+            sys.exit(1)
+    else:    
+        if not scanner.ScanDir([args.src_path], parser):
+            sys.exit(1)
     if not parser.Validate():
         sys.exit(1)
     param_groups = parser.GetParamGroups()