added a --params commandline option

as in axon-runprocess, allows to pass parameters in a file

capsul/process/runprocess.py

@@ -311,6 +311,20 @@ def main():
                       'studyconfig file). If not specified neither on the '
                       'commandline nor study configfile, taken as the same as '
                       'input.')
+    group1.add_option('--params', dest='paramsfile', default=None,
+                      help='specify a file containing commandline parameters. '
+                      'The file will contain arguments for this commandline '
+                      '(argv): it is an alternative to providing them here. '
+                      'It can be useful to reuse parameters, or when the '
+                      'parameters are too long (in a large iteration, '
+                      'typically). The file syntax is one line per parameter, '
+                      'with no further parsing. It will be processed after '
+                      'all the current commanline arguments, not right now as '
+                      'the argument appears. But if a parameter has already '
+                      'been set (via commandline), it will not be replaced: '
+                      'first set arguments have priority. If the params file '
+                      'itself contains a --params parameter, then another '
+                      'file will be read afterwards, and so on.')
     parser.add_option_group(group1)
 
     group2 = OptionGroup(parser, 'Processing',
@@ -395,6 +409,17 @@ def main():
     parser.disable_interspersed_args()
     (options, args) = parser.parse_args()
 
+    while options.paramsfile:
+        pfile = options.paramsfile
+        options.paramsfile = None
+        with open(pfile) as f:
+            new_argv = [l.strip() for l in f.readlines()]
+        new_options, new_args = parser.parse_args(new_argv)
+        for k, v in new_options.__dict__.items():
+            if not getattr(options, k, None):
+                setattr(options, k, v)
+        args += new_args
+
     if options.config:
         engine = capsul_engine()
         with open(options.config) as f: