resolve package:// path strings

This fixes fmauch#1

Author: fmauch

script/create_session

@@ -20,9 +20,12 @@
 # -- END LICENSE BLOCK ------------------------------------------------
 
 from __future__ import print_function
+import os
 import subprocess
 import sys
 
+import rospkg
+
 import argparse
 
 from catmux.session import Session as CatmuxSession
@@ -41,7 +44,7 @@ def safe_call(cmd_list):
 def parse_arguments(debug=False):
     """Parse command line arguments"""
     parser = argparse.ArgumentParser(description='Create a new catmux session')
-    parser.add_argument('session_config', metavar='config',
+    parser.add_argument('session_config',
                         help="Session configuration. Should be a yaml-file.")
     parser.add_argument('-n', '--session_name', default='catmux',
                         help="Name used for the tmux session")
@@ -60,12 +63,28 @@ def parse_arguments(debug=False):
     return args
 
 
+def resolve_path(path_string):
+    """Resolves a package:// path string"""
+    if path_string.find('package://') >= 0:
+        rospack = rospkg.RosPack()
+        relevant_path = path_string.split('://')[1]
+        split_path = relevant_path.split('/', 1)
+        try:
+            package_path = rospack.get_path(split_path[0])
+        except rospkg.ResourceNotFound:
+            print('ERROR: Package with name "{}" could not be found'.
+                  format(split_path[0]))
+            sys.exit(1)
+        path_string = os.path.join(package_path, split_path[1])
+    return path_string
+
 def main():
     """Creates a new tmux session if it does not yet exist"""
     args = parse_arguments()
 
+
     session_config = CatmuxSession(args.overwrite)
-    session_config.init_from_filepath(args.session_config)
+    session_config.init_from_filepath(resolve_path(args.session_config))
 
     try:
         subprocess.check_call(['tmux', 'has-session', '-t', args.session_name])
@@ -79,7 +98,7 @@ def main():
 
     command = ['tmux']
     if args.tmux_config:
-        command += ['-f', args.tmux_config]
+        command += ['-f', resolve_path(args.tmux_config)]
     command += ['new-session', '-s', args.session_name]
     command.append('-d')
     if not safe_call(command):