better argument treatment

seaman.py

@@ -24,6 +24,7 @@ import sys
 import time
 import termios
 import subprocess
+import os
 from servicemanager.base import ServiceManager, ServiceDown
 from servicemanager.sicsclient import sics_client
 
@@ -66,21 +67,21 @@ class SeaManager(ServiceManager):
         try:
             self.check_running(ins, 'sea')
         except ServiceDown as e:
-            self.usage()
+            self.do_help()
             print(str(e))
         except KeyError:  # running on an other machine?
-            self.usage()
+            self.do_help()
         run_command('six -sea %s' % ins, wait=True)
 
     def do_gui(self, ins=''):
         try:
             self.check_running(ins, 'sea')
         except ServiceDown as e:
-            self.usage()
+            self.do_help()
             print(str(e))
             return
         except KeyError:  # running on an other machine?
-            self.usage()
+            self.do_help()
         run_command('SeaClient %s' % ins)
         print('starting sea gui %s' % ins)
         time.sleep(5)
@@ -97,3 +98,24 @@ class SeaManager(ServiceManager):
         except Exception as e:
             print(self.info)
             return repr(e)
+
+    def treat_args(self, argdict, unknown=(), extra=()):
+        if len(unknown) == 1:
+            insts = set()
+            filename = os.environ.get('InstrumentHostList')
+            if filename:
+                with open(filename) as fil:
+                    for line in fil:
+                        inst = None
+                        sea = False
+                        for item in line.split():
+                            key, _, value = item.partition('=')
+                            if key == 'instr':
+                                inst = value
+                            elif key == 'sea':
+                                sea = True
+                        if inst and sea:
+                            insts.add(inst)
+                if unknown[0] in insts:
+                    return super().treat_args(argdict, (), unknown)
+        return super().treat_args(argdict, unknown, extra)