Script to rot(n, text)

bin/rot.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+# vim: set noet ts=4:
+
+import sys
+import optparse
+
+translations = {
+			0:  "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",
+			1:  "bcdefghijklmnopqrstuvwxyzaBCDEFGHIJKLMNOPQRSTUVWXYZA",
+			2:  "cdefghijklmnopqrstuvwxyzabCDEFGHIJKLMNOPQRSTUVWXYZAB",
+			3:  "defghijklmnopqrstuvwxyzabcDEFGHIJKLMNOPQRSTUVWXYZABC",
+			4:  "efghijklmnopqrstuvwxyzabcdEFGHIJKLMNOPQRSTUVWXYZABCD",
+			5:  "fghijklmnopqrstuvwxyzabcdeFGHIJKLMNOPQRSTUVWXYZABCDE",
+			6:  "ghijklmnopqrstuvwxyzabcdefGHIJKLMNOPQRSTUVWXYZABCDEF",
+			7:  "hijklmnopqrstuvwxyzabcdefgHIJKLMNOPQRSTUVWXYZABCDEFG",
+			8:  "ijklmnopqrstuvwxyzabcdefghIJKLMNOPQRSTUVWXYZABCDEFGH",
+			9:  "jklmnopqrstuvwxyzabcdefghiJKLMNOPQRSTUVWXYZABCDEFGHI",
+			10: "klmnopqrstuvwxyzabcdefghijKLMNOPQRSTUVWXYZABCDEFGHIJ",
+			11: "lmnopqrstuvwxyzabcdefghijkLMNOPQRSTUVWXYZABCDEFGHIJK",
+			12: "mnopqrstuvwxyzabcdefghijklMNOPQRSTUVWXYZABCDEFGHIJKL",
+			13: "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM",
+			14: "opqrstuvwxyzabcdefghijklmnOPQRSTUVWXYZABCDEFGHIJKLMN",
+			15: "pqrstuvwxyzabcdefghijklmnoPQRSTUVWXYZABCDEFGHIJKLMNO",
+			16: "qrstuvwxyzabcdefghijklmnopQRSTUVWXYZABCDEFGHIJKLMNOP",
+			17: "rstuvwxyzabcdefghijklmnopqRSTUVWXYZABCDEFGHIJKLMNOPQ",
+			18: "stuvwxyzabcdefghijklmnopqrSTUVWXYZABCDEFGHIJKLMNOPQR",
+			19: "tuvwxyzabcdefghijklmnopqrsTUVWXYZABCDEFGHIJKLMNOPQRS",
+			20: "uvwxyzabcdefghijklmnopqrstUVWXYZABCDEFGHIJKLMNOPQRST",
+			21: "vwxyzabcdefghijklmnopqrstuVWXYZABCDEFGHIJKLMNOPQRSTU",
+			22: "wxyzabcdefghijklmnopqrstuvWXYZABCDEFGHIJKLMNOPQRSTUV",
+			23: "xyzabcdefghijklmnopqrstuvwXYZABCDEFGHIJKLMNOPQRSTUVW",
+			24: "yzabcdefghijklmnopqrstuvwxYZABCDEFGHIJKLMNOPQRSTUVWX",
+			25: "zabcdefghijklmnopqrstuvwxyZABCDEFGHIJKLMNOPQRSTUVWXY"
+		}
+
+def main():
+	usage = "rot.py [-n n] <string>"
+	parser = optparse.OptionParser(usage=usage)
+	parser.add_option('-n', action='store', type="int", help='Rotate by n (0 <= n <= 26)', )
+	options, args = parser.parse_args()
+	s = ""
+	if len(args) == 0:
+		print("Please provide a string!")
+		sys.exit(1)
+	elif len(args) == 1:
+		s = args[0]
+	else:
+		s = " ".join(args)
+
+	if options.n is not None:
+		if 1 <= options.n <= 25:
+			rot = str.maketrans("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", translations[options.n])
+			t = str.translate(s, rot)
+			print(f"rot({options.n:2d}): {t}")
+		elif options.n == 0 or options.n == 26:
+			print(f"rot({options.n:2d}): {s}")
+		else:
+			print("Valid range for n: 0 to 26! 0 equals 26")
+			sys.exit(1)
+	else:
+		print(f"rot( 0): {s}")
+		for i in range(1,26):
+			rot = str.maketrans("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", translations[i])
+			t = str.translate(s, rot)
+			print(f"rot({i:2d}): {t}")
+
+if __name__ == '__main__':
+	main()