75th · January 25, 2019 16:06 · Sep 17, 2013 · Jul 13, 2013 · Jul 13, 2013 · Jun 14, 2013
diff --git a/rot.sh b/rot.sh
@@ -59,15 +59,12 @@ function rot() {
 
 	local funcname="rot${realbase}"
 
-#	I had the idea to clarify for the user what the actual 0-25 ROT base
-#	was if they omit the base or use one outside that range. But then
-#	that's no good for piping into other things. Maybe I'll add a flag
-#	for this later or something, but for now it's just commented out.
+	# If the base was converted above, send the actual 0-25 base to stderr
 
-#	if (($origbase != $realbase))
-#	then
-#		echo "(ROT-${realbase})"
-#	fi
+	if (($origbase != $realbase))
+	then
+		echo "(ROT-${realbase})" 1>&2
+	fi
 
 	echo "$string" | tr 'A-Za-z' "${!funcname}"
 

diff --git a/rot.sh b/rot.sh
@@ -1,13 +1,15 @@
 #! /bin/bash
 
 # Usage: rot [base] string
-
+#
 # Base is assumed to be 13 if not specified.
-
-# Bases not in 0-25 are taken modulo 26; any integer should work
-# as expected
+#
+# Bases not in 0-25 are taken modulo 26; negatives are increased by
+# 26es until they're positive. Thus, any integer should work
+# as expected.
 
 function rot() {
+
 	local pattern='^-?[0-9]+$'
 
 	if [[ $1 =~ $pattern ]]; # Is first argument an integer?
@@ -23,7 +25,7 @@ function rot() {
 
 	while (($base < 0))
 	do
-		base=$(($base + 26)) # Poor man's modulo for negative numbers
+		base=$(($base + 26)) # Modulo ought to work this way
 	done
 
 	local realbase=$(($base % 26))
@@ -57,10 +59,15 @@ function rot() {
 
 	local funcname="rot${realbase}"
 
-	if (($origbase != $realbase))
-	then
-		echo "(ROT-${realbase})"
-	fi
+#	I had the idea to clarify for the user what the actual 0-25 ROT base
+#	was if they omit the base or use one outside that range. But then
+#	that's no good for piping into other things. Maybe I'll add a flag
+#	for this later or something, but for now it's just commented out.
+
+#	if (($origbase != $realbase))
+#	then
+#		echo "(ROT-${realbase})"
+#	fi
 
 	echo "$string" | tr 'A-Za-z' "${!funcname}"
 

diff --git a/rot.sh b/rot.sh
@@ -8,7 +8,7 @@
 # as expected
 
 function rot() {
-	local pattern='^-{0,1}[0-9]+$'
+	local pattern='^-?[0-9]+$'
 
 	if [[ $1 =~ $pattern ]]; # Is first argument an integer?
 	then

diff --git a/rot.sh b/rot.sh
@@ -0,0 +1,69 @@
+#! /bin/bash
+
+# Usage: rot [base] string
+
+# Base is assumed to be 13 if not specified.
+
+# Bases not in 0-25 are taken modulo 26; any integer should work
+# as expected
+
+function rot() {
+	local pattern='^-{0,1}[0-9]+$'
+
+	if [[ $1 =~ $pattern ]]; # Is first argument an integer?
+	then
+		local base="$1"
+		local string="$2"
+		local origbase="$1" # Save original base for later clarification
+	else
+		local base="13"
+		local string="$1"
+		local origbase="null"
+	fi
+
+	while (($base < 0))
+	do
+		base=$(($base + 26)) # Poor man's modulo for negative numbers
+	done
+
+	local realbase=$(($base % 26))
+
+	local rot0='A-Za-z'
+	local rot1='B-ZAb-za'
+	local rot2='C-ZA-Bc-za-b'
+	local rot3='D-ZA-Cd-za-c'
+	local rot4='E-ZA-De-za-d'
+	local rot5='F-ZA-Ef-za-e'
+	local rot6='G-ZA-Fg-za-f'
+	local rot7='H-ZA-Gh-za-g'
+	local rot8='I-ZA-Hi-za-h'
+	local rot9='J-ZA-Ij-za-i'
+	local rot10='K-ZA-Jk-za-j'
+	local rot11='L-ZA-Kl-za-k'
+	local rot12='M-ZA-Lm-za-l'
+	local rot13='N-ZA-Mn-za-m'
+	local rot14='O-ZA-No-za-n'
+	local rot15='P-ZA-Op-za-o'
+	local rot16='Q-ZA-Pq-za-p'
+	local rot17='R-ZA-Qr-za-q'
+	local rot18='S-ZA-Rs-za-r'
+	local rot19='T-ZA-St-za-s'
+	local rot20='U-ZA-Tu-za-t'
+	local rot21='V-ZA-Uv-za-u'
+	local rot22='W-ZA-Vw-za-v'
+	local rot23='X-ZA-Wx-za-w'
+	local rot24='Y-ZA-Xy-za-x'
+	local rot25='ZA-Yza-y'
+
+	local funcname="rot${realbase}"
+
+	if (($origbase != $realbase))
+	then
+		echo "(ROT-${realbase})"
+	fi
+
+	echo "$string" | tr 'A-Za-z' "${!funcname}"
+
+}
+
+rot "$1" "$2"
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