diff --git a/mros2_header_generator/templates_generator.py b/mros2_header_generator/templates_generator.py
index cc2e17d..793d5d1 100644
--- a/mros2_header_generator/templates_generator.py
+++ b/mros2_header_generator/templates_generator.py
@@ -1,12 +1,10 @@
 import os
 import sys
 import re
+import argparse
 from os import path
 from jinja2 import Environment, FileSystemLoader
 
-arg = sys.argv
-app = arg[1]
-
 includeFiles = []
 pubMsgTypes = []
 subMsgTypes = []
@@ -15,7 +13,21 @@ def toSnakeCase(string):
     return re.sub("(.[A-Z])",lambda x:x.group(1)[0] + "_" +x.group(1)[1],string).lower()
 
 def main():
-    with open(app + "/app.cpp", 'r') as m_f:
+    print('Generate template.hpp from mros2 app code file.')
+
+    parser = argparse.ArgumentParser(description='Generate template.hpp from mros2 app code file.')
+    parser.add_argument('--outdir', default='.',
+                    help='directry name to output template.hpp (default: \'.\' (current dir))')
+    parser.add_argument('--file', nargs='*', type=str, default=['app.cpp'],
+                    help='filename(s) of mros2 app code (default: \'app.cpp\')')
+
+    args = parser.parse_args()
+    outdir = args.outdir
+    file = args.file
+
+    for f in file:
+        print('  Analyzing \'{}\' to generate...'.format(f))
+        with open(f, 'r') as m_f:
             arr = m_f.readlines()
             for m_line in arr:
                 if "create_publisher" in m_line:
@@ -41,8 +53,10 @@ def main():
     env = Environment(loader=FileSystemLoader(path.dirname(__file__)))
     template = env.get_template('templates.tpl')
     datatext = template.render({ "includeFiles":includeFiles, "pubMsgTypes":pubMsgTypes, "subMsgTypes":subMsgTypes  })
-    with open(os.path.join(app+"/templates.hpp"), "wb") as f:
+    with open(os.path.join(outdir + "/templates.hpp"), "wb") as f:
         f.write(datatext.encode('utf-8'))
 
+    print('Generate {}/template.hpp done.'.format(outdir))
+
 if __name__ == "__main__":
     main()