added explorationtools.py

For now only has a single subcommend, `bodycount`. It returns the number
of bodies in a system.

README.md

@@ -19,3 +19,30 @@ optional arguments:
   --gui            explicitly run the GUI
   --text           explicitly give text output
 ```
+
+## explorationtools.py ##
+
+```
+usage: explorationtools.py [-h] {bodycount} ...
+
+A collection of tools useful for exploration.
+
+optional arguments:
+  -h, --help   show this help message and exit
+
+subcommands:
+  {bodycount}  sub-command help
+    bodycount  Returns the number of bodies in a system. Will exit with code 1
+               on server error and code 2 if the system could not be found in
+               EDSM.
+```
+
+```
+usage: explorationtools.py bodycount [-h] system
+
+positional arguments:
+  system      the system in question
+
+optional arguments:
+  -h, --help  show this help message and exit
+```

explorationtools.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+import argparse
+import math
+import sys
+
+from pyEDSM.edsm.exception import ServerError, NotFoundError
+from pyEDSM.edsm.models import System, Commander
+
+# ===========================================================================
+
+def getBodyCount(system):
+  try:
+    bodyCount = System(system).bodyCount
+  except ServerError as e:
+    print(e)
+    sys.exit(1)
+  except NotFoundError as e:
+    print(e)
+    sys.exit(2)
+  else:
+    print(bodyCount)
+    sys.exit(0)
+
+# ===========================================================================
+
+parser = argparse.ArgumentParser(description="A collection of tools useful for "
+    + "exploration.")
+subparsers = parser.add_subparsers(title="subcommands", help="sub-command help",
+    dest="subCommand")
+
+parser_bodycount = subparsers.add_parser("bodycount",
+    help="Returns the number of bodies in a system. Will exit with code 1 on "
+    + "server error and code 2 if the system could not be found in EDSM.")
+parser_bodycount.add_argument("system", nargs=1, help="the system in question")
+
+args = parser.parse_args()
+
+# ===========================================================================
+
+if args.subCommand == "bodycount":
+  getBodyCount(args.system[0])

pyEDSM

@@ -1 +1 @@
-Subproject commit 573c6c322ff27e304fc2dd803f362156f8d45dbb
+Subproject commit f0a54a7fe4cbc8c6fdab20fdceb1107e5c50f1bd