string.find

Can't seem to find what's located in another file. It just skips over to the else. It worked before till I started doing some pathing with it, now I think I gotta adjust it but I'm not sure how. Oh and as for the naming… Don't ask. :D/>

if fs.exists("derp") then
				local rf = fs.open("derp", "r")
				lines = rf.readAll()  
				rf.close()
				while lines do
						if lines and string.find(lines, [[shell.run%("herpherp-1.0/herpherp"%)]]) then
								print("FOUND IT!")					
						else
								print("Didn't find herpherp.")
								error()
						end
				end
end

Hypothetically speaking this is what I've got. Within the file, "derp" will have "shell.run("herpherp-1.0/herpherp"). Before when it was just shell.run("herpherp") it would work with the setup I have, but now that I've added a bunch of stuff to it, it can't detect it.

Im going to revamp this code for you:

if fs.exists("derp") then
   local rf = fs.open("derp", "r")
   local content = {}
   for line in rf.readLine do
      if line:find( "shell%.run%(\"test\"%)" ) then -- Use strings, escape the the " with \ and 'magic' chars with %
           print("Found it!")
      end
   end
end

Here is an awesome site that shows you the magic characters: http://www.gammon.com.au/scripts/doc.php?lua=string.find
Enjoy :)/>

Engineer, on 16 June 2013 - 09:19 AM said:

Im going to revamp this code for you:

if fs.exists("derp") then
   local rf = fs.open("derp", "r")
   local content = {}
   for line in rf.readLine do
	  if line:find( "shell%.run%(\"test\"%)" ) then -- Use strings, escape the the " with \ and 'magic' chars with %
		   print("Found it!")
	  end
   end
end

Here is an awesome site that shows you the magic characters: http://www.gammon.co...lua=string.find
Enjoy :)/>

ehhm remember to close the fs.open :D/>

if fs.exists("derp") then
   local rf = fs.open("derp", "r")
   local content = {}
   for line in rf.readLine() do -- and remember parantheses :D/>
      if line:find( "shell%.run%(\"test\"%)" ) then -- Use strings, escape the the " with \ and 'magic' chars with %
           print("Found it!")
      end
   end
   rf.close()
end

Lol, thanks guys. This'll be of a lot more use than what I had, definitely.

Engineer, on 16 June 2013 - 09:19 AM said:

-snip-

I remember finding that site before but that's when I was zombified. Lol, now that I see it, it makes sense where I screwed up. Thanks man. :D/>

Another option to escaping magic characters would be to perform a plain search:

string.find(line, 'shell.run("herpherp-1.0/herpherp")', 1, true)

Also note that you can use ' for strings, so you don't need to escape the " too.

MysticT, on 16 June 2013 - 07:12 PM said:

Another option to escaping magic characters would be to perform a plain search:

string.find(line, 'shell.run("herpherp-1.0/herpherp")', 1, true)

Also note that you can use ' for strings, so you don't need to escape the " too.

I swear I need to beat my head against this lua book I downloaded… Maybe I'll remember something then, lol. Thanks for that MysticT, that seemed to do the trick perfectly.

BlueZero, on 17 June 2013 - 07:20 AM said:

I swear I need to beat my head against this lua book I downloaded…

Out of curiosity. What book did you download?

theoriginalbit, on 17 June 2013 - 07:21 AM said:

-snip-

Something that'll probably make you facepalm but I downloaded Programming in Lua 2nd Edition.

Nah the PIL is probably the best one you could have got. The best version to get being the one for the version of Lua that ComputerCraft uses.

I don't know, I just don't find it to be soaking in properly. I read pages after pages and it's like, "WTf did I just read?". I think I might learn better from gradual complexity is code. I seem to understand by looking at code snippets and programming in it than really reading about it.

I wonder if that'd be a good book idea. Starting with very basic functions and declarations of it in example programs as they gradually get more and more complex and using different functions of lua.

Could be a good idea.

A lot of people find the PIL easier to read in this format, its less info at once then.

Another one of my problems I guess I've got is that I haven't taken any advanced math so some language they use in that book when referring to different functions I don't understand. Factorials and such like in that link you've got, I've never really understand that when I was reading through so I mostly just smiled and nodded, then tried to continue.

A factorial. represented by n!, where the result is the product of all the positive integers below n.

So 5! is
5 x 4 x 3 x 2 x 1 = 120

10! is
10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 3628800

So that first example that they give you, takes an input from the user, converts it to a number, and prints the result of the factorial of that number.

Believe me, I didn't do any "advanced mathematics" either, but that is what Google is for ;)/>

Yeah. Lol, I donno. The only thing I found interesting enough when it came to learning to program was Code Academy. That was cool seeing as it was purely web user-interface driven. It teaches you python and php and such. They should add more languages. I learned python a little bit from there but in the end got disinterested seeing as I never used it for anything. Atleast with lua I've got an outlet to work with being computercraft. :P/>