xm support for abbreviated commands

[Tom Wilkie <tw275@cam.ac.uk>]

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This patch adds support for abbreviated commands to xm.

Eg xm li -> xm list, for all those people where typing 'st' will kill them

It makes sure the abbreviated command is not ambiguous, and at least 2 
letters long.

Tom

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diff -r 50e57636bdd8 tools/python/xen/xm/main.py
--- a/tools/python/xen/xm/main.py	Wed Aug 10 12:21:39 2005
+++ b/tools/python/xen/xm/main.py	Wed Aug 10 13:59:44 2005
@@ -605,6 +605,10 @@
         deprecated(cmd,aliases[cmd])
         return commands[aliases[cmd]]
     else:
+        if len( cmd ) > 1:
+            matched_commands = filter( lambda (command, func): command[ 0:len(cmd) ] == cmd, commands.iteritems() )
+            if len( matched_commands ) == 1:
+                return matched_commands[0][1]
         err('Sub Command %s not found!' % cmd)
         usage()
 

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