[Lua] Turtle copying on placement

print("Copying files...")

fs.copy("disk/file1", "file1")
fs.copy("disk/file2", "file2")
fs.copy("disk/file3", "file3")
fs.copy("disk/file4", "file4")

print("Copied programs.")

rs.setOutput("top", true") -- This is because I have a lamp above 

if fs.exists("disk/file1") then
    fs.delete("disk/file1")
end

if fs.exists("fileX") then
   fs.delete("fileX")
end

-- 3.14

if fs.exists("fileX") then
   -- Following Section gathers the Version lines, supposing you mak it the first line of the program. -- 
   fOld = fs.open("fileX", "r")  --  Read HD File.
   fNew = fs.open("disk/fileX", "r"  --  Read DISK File
   sOldVer = fOld.readLine()  --  Get first line of HD file
   sNewVer = fNew.readLine()  --  Get first line of DISK file
   fOld.close()  --  Saves any file changes to the HD (since we use "r" instead of "w", no changes, so it just releases the file)
   fNew.close()  --  Saves any file changes to the DISK (since we use "r" instead of "w", no changes, so it just releases the file)

   -- Following Section will find the numbers, and compare them
   sOldVer = tonumber(string.sub(sOldVer, 4, #sOldVer))  --  Using the comment line I used as an example, this would grab the number 3.14, since 3 is the third char on the line, and the string is only 8 chars long.
   sNewVer = tonumber(string.sub(sNewVer, 4, #sNewVer))  -- See last line

   if sNewVer > sOldVer then  --  Comparison and replacement.
	  fs.delete("fileX")
	  fs.copy("disk/fileX", "fileX")
   end
end

remiX, on 27 December 2012 - 05:47 AM said:

Use an if statement to check if they exist:

if fs.exists("disk/file1") then
	fs.delete("disk/file1")
end

OmegaVest, on 27 December 2012 - 05:54 AM said:

Well, for finding if it exists already, you can use:

if fs.exists("fileX") then
   fs.delete("fileX")
end

But, for figuring out the version numbers, that depends on what your first line is. Personally I would just make the first line of any program the version number, with a comment tag.

Sample:

-- 3.14

So, figuring that out would be something akin to this:

Spoiler

if fs.exists("fileX") then
   fOld = fs.open("fileX", "r")
   fNew = fs.open("disk/fileX", "r"
   sOldVer = fOld.readLine()
   sNewVer = fNew.readLine()
   fOld.close()
   fNew.close()

   sOldVer = tonumber(string.sub(sOldVer, 4, #sOldVer))
   sNewVer = tonumber(string.sub(sNewVer, 4, #sNewVer))
   if sNewVer > sOldVer then
	  fs.delete("fileX")
	  fs.copy("disk/fileX", "fileX")
   end
end

But this is rough, and probably won't work properly. But even if it doesn't, you should be able to figure out how to do it from this.

OmegaVest, on 27 December 2012 - 06:00 AM said:

Query: When you say "On the computer", do you mean you are trying to copy from the disk to the turtle, using the computer as a controller? Because, that won't work. If, however, you intend to put the startup on the disk, then that will work.

Lyqyd, on 27 December 2012 - 07:28 AM said:

I have an idea: be patient. This is a forum, not an instant messaging service. Triple-posting just to bump your own topic is highly frowned upon.

OmegaVest gave you the answer. You can't copy over existing files, so check if the file exists in the destination, and delete it first if it does. What's wrong with that answer?

if fs.exists("file1") then
  fs.delete("file1")
end
fs.copy("disk/file1", "file1")

W00dyR, on 27 December 2012 - 05:24 AM said:

If the program exists, it needs to get the version from the disk (since that will be the most recent version).

OmegaVest, on 27 December 2012 - 08:52 AM said:

W00dyR, on 27 December 2012 - 05:24 AM said:

If the program exists, it needs to get the version from the disk (since that will be the most recent version).

My code was about this line. And I'm gonna add in some comments when I get a moment.