Added Caesar cipher decryptor

caesar.py

@@ -0,0 +1,27 @@
+import sys
+from lib.vars import alphabet
+
+if( len(sys.argv) >= 4 ):
+    in_key = int(sys.argv[1])
+    in_txt = sys.argv[2]
+    in_alphabet = sys.argv[3]
+else:
+    print("file.py {int KEY} {string TXT} {string ALPHABET_TYPE}")
+    exit()
+
+alen = len(alphabet[in_alphabet])
+
+txt_list = list(in_txt)
+decryp_list = [""] * len(in_txt)
+
+for char in txt_list:
+    index = alphabet[in_alphabet].index(char)
+    
+    index = index + in_key # shift the alphabet
+    while( index >= alen ): #cycle through the alphabet 
+        diff = (index + in_key) - (alen - 1)
+        index = 0 + diff # a bit spaghetti but who doesn't like spaghetti
+
+    decryp_list[txt_list.index(char)] = alphabet[in_alphabet][index]
+
+print(decryp_list)

lib/vars.py

@@ -1,10 +1,12 @@
-alphabet = ["a", "b" ]
+eng_alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]
-F 	G 	H 	I 	J
 
-K 	L 	M 	N 	O
+swe_alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "å", "ä", "ö"]
 
-P 	Q 	R 	S 	T
 
-U 	V 	W 	X 	Y
+# Definitions
+alphabet = dict()
 
-Z 	Å 	Ä 	Ö
+alphabet["ENG"] = eng_alphabet
+alphabet["SWE"] = swe_alphabet 
+
+# Functions