moveconfig: Tidy up imply flag parsing

Add an option to specify 'all' to enable all flags. Also print an error
if an unrecognised flag is used. At present it just prints usage
information which is not very helpful.
Signed-off-by: NSimon Glass <sjg@chromium.org>

tools/moveconfig.py

@@ -1886,14 +1886,21 @@ def main():
 
     if options.imply:
         imply_flags = 0
-        for flag in options.imply_flags.split():
-            if flag == 'help' or flag not in IMPLY_FLAGS:
-                print "Imply flags: (separate with ',')"
-                for name, info in IMPLY_FLAGS.iteritems():
-                    print ' %-15s: %s' % (name, info[1])
-                parser.print_usage()
-                sys.exit(1)
-            imply_flags |= IMPLY_FLAGS[flag][0]
+        if options.imply_flags == 'all':
+            imply_flags = -1
+
+        elif options.imply_flags:
+            for flag in options.imply_flags.split(','):
+                bad = flag not in IMPLY_FLAGS
+                if bad:
+                    print "Invalid flag '%s'" % flag
+                if flag == 'help' or bad:
+                    print "Imply flags: (separate with ',')"
+                    for name, info in IMPLY_FLAGS.iteritems():
+                        print ' %-15s: %s' % (name, info[1])
+                    parser.print_usage()
+                    sys.exit(1)
+                imply_flags |= IMPLY_FLAGS[flag][0]
 
         do_imply_config(configs, options.add_imply, imply_flags,
                         options.skip_added)