--- a/Tools/scripts/diff.py	Mon Aug 09 16:43:36 2004 +0000
+++ b/Tools/scripts/diff.py	Mon Aug 09 17:27:55 2004 +0000
@@ -8,33 +8,38 @@
 
 import sys, os, time, difflib, optparse
 
-usage = "usage: %prog [options] fromfile tofile"
-parser = optparse.OptionParser(usage)
-parser.add_option("-c", action="store_true", default=False, help='Produce a context format diff (default)')
-parser.add_option("-u", action="store_true", default=False, help='Produce a unified format diff')
-parser.add_option("-n", action="store_true", default=False, help='Produce a ndiff format diff')
-parser.add_option("-l", "--lines", type="int", default=3, help='Set number of context lines (default 3)')
-(options, args) = parser.parse_args()
+def main():
 
-if len(args) == 0:
-    parser.print_help()
-    sys.exit(1)
-if len(args) != 2:
-    parser.error("need to specify both a fromfile and tofile")
+    usage = "usage: %prog [options] fromfile tofile"
+    parser = optparse.OptionParser(usage)
+    parser.add_option("-c", action="store_true", default=False, help='Produce a context format diff (default)')
+    parser.add_option("-u", action="store_true", default=False, help='Produce a unified format diff')
+    parser.add_option("-n", action="store_true", default=False, help='Produce a ndiff format diff')
+    parser.add_option("-l", "--lines", type="int", default=3, help='Set number of context lines (default 3)')
+    (options, args) = parser.parse_args()
+
+    if len(args) == 0:
+        parser.print_help()
+        sys.exit(1)
+    if len(args) != 2:
+        parser.error("need to specify both a fromfile and tofile")
 
-n = options.lines
-fromfile, tofile = args
+    n = options.lines
+    fromfile, tofile = args
 
-fromdate = time.ctime(os.stat(fromfile).st_mtime)
-todate = time.ctime(os.stat(tofile).st_mtime)
-fromlines = open(fromfile).readlines()
-tolines = open(tofile).readlines()
+    fromdate = time.ctime(os.stat(fromfile).st_mtime)
+    todate = time.ctime(os.stat(tofile).st_mtime)
+    fromlines = open(fromfile).readlines()
+    tolines = open(tofile).readlines()
 
-if options.u:
-    diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
-elif options.n:
-    diff = difflib.ndiff(fromlines, tolines)
-else:
-    diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
+    if options.u:
+        diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
+    elif options.n:
+        diff = difflib.ndiff(fromlines, tolines)
+    else:
+        diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
 
-sys.stdout.writelines(diff)
+    sys.stdout.writelines(diff)
+
+if __name__ == '__main__':
+    main()