add option to idlpp to maintain the include file namespace (#20)

* add option to idlpp to maintain the include file namespace

* remove warnings

* combine identical code parts

* simplify return logic

* update opensplice version check

* import order, escape sequence

rosidl_typesupport_opensplice_cpp/rosidl_typesupport_opensplice_cpp/__init__.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import os
+import re
 import subprocess
 
 from rosidl_cmake import convert_camel_case_to_lower_case_underscore
@@ -24,6 +25,25 @@
 from rosidl_parser import validate_field_types
 
 
+def check_idlpp_supports_include_namespaces(idl_pp):
+    version = 0
+    build = 0
+
+    r = subprocess.getstatusoutput(idl_pp + ' -v')
+    ospl_version = r[1].split(':')[1].strip()
+    m = re.search(r'([1-9][0-9]*)\.([0-9]+)\.([0-9]*)', ospl_version)
+    if m and m.lastindex == 3:
+        major = int(m.group(1))
+        minor = int(m.group(2))
+        build = int(m.group(3))
+        version = major * 100 + minor
+
+    if ospl_version.endswith('OSS'):
+        return version > 609 or (version == 609 and build > 190226)
+    else:
+        return version > 610 or (version == 610 and build > 1)
+
+
 def generate_dds_opensplice_cpp(
     pkg_name, dds_interface_files, dds_interface_base_path, deps, output_basepath, idl_pp
 ):
@@ -61,6 +81,11 @@ def generate_dds_opensplice_cpp(
         cmd = [idl_pp]
         for include_dir in include_dirs:
             cmd += ['-I', include_dir]
+        if check_idlpp_supports_include_namespaces(idl_pp):
+            cmd += [
+                '-o',
+                'maintain-include-namespace'
+            ]
         cmd += [
             '-S',
             '-l', 'cpp',