What's wrong with my string.gsub()?

[Steve Litt <slitt@...>]

Hi all,

Here's a nonworking mock-up of code to implement Prompted Argument 
Substitution in my UMENU program. In the string str, things of the form 
%x%prompt%% should trigger a prompt for the user to type in information which 
replaces the thing of the form %x%prompt%%. The UMENU specifications demand 
that all prompts be presented to the user in sort order, not in the order they 
appear in the command. So I first insert them all in the words array, then 
sort the words array so they are presented in sorted order, then present them 
as prompts so the user can type in the information, and on each, I do a 
string.gsub() to replace that prompt with the user's response. Unfortunately 
it doesn't work and I have no idea why.

=================================
str = "mycommand %c%Carg please=>%% %b%Barg please=>%% %a%Aarg please=>%% 
final args"

words = {}
	for w in string.gfind(str, "%%.%%.-%%%%") do
		table.insert(words, w)
	end

table.sort(words, function (a, b)
	return string.lower(a) < string.lower(b)
end)

io.write("B4 , str=>"); print(str)
for k,v in ipairs(words, k) do
	local temp = string.gsub(v, "%%.%%", "")
	local response
	local junk = str
	temp = string.gsub(temp, "%%%%", "")
	io.write(temp)
	response = io.read()
	print(v)
	print(response)
	str = string.gsub(str, v, response)
	--str = string.gsub(str, tostring(v), response,1)
	print(str)
end
io.write("Aft, str=>"); print(str)
=================================
Here's a session:

******************************************
slitt@mydesk:~/ulua/program$ ./test.lua
B4 , str=>mycommand %c%Carg please=>%% %b%Barg please=>%% %a%Aarg please=>%% 
final args
Aarg please=>al
%a%Aarg please=>%%
al
mycommand %c%Carg please=>%% %b%Barg please=>%% %a%Aarg please=>%% final args
Barg please=>ben
%b%Barg please=>%%
ben
mycommand %c%Carg please=>%% %bben% %a%Aarg please=>%% final args
Carg please=>cim
%c%Carg please=>%%
cim
mycommand %c%Carg please=>%% %bben% %a%Aarg please=>%% final args
Aft, str=>mycommand %c%Carg please=>%% %bben% %a%Aarg please=>%% final args
slitt@mydesk:~/ulua/program$
******************************************

Everything works until the final string.gsub(), and that fails to substitute 
on A and C, and substitutes in an odd manner on B. Anyone see what I'm doing 
wrong?

Thanks

SteveT

Steve Litt
Recession Relief Package
http://www.recession-relief.US
Twitter: http://www.twitter.com/stevelitt