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Posts posted by Molinko

  1. local function list_files(dir)
      local files = {}
      for path, err in filesystem.list(dir) do
        assert(path, err)
        if not filesystem.isDirectory(path) then
          table.insert(files, path)
      return files
    -- # use
    local files = list_files '/home'
    -- # example result
    -- {
    --	'test.lua',
    --	'poop.cfg'
    -- }


  2. Firstly you're mixing up file:read and file:write.. One writes to the file and the other reads.

    local config = {}
    for line in io.lines "/path/to/config.txt" do
      table.insert(config, line)
    print(config[3]) -- # 3rd line in your config
    -- # this is probably the simplest way but there are others.

    To read a specific line in a file you'd have to know the exact offset of bytes until the information you're trying to read.

  3. It writes to the current line of a new file, so in this case it'd be the 1st line. To read the first line just open the file in read mode `

    file = io.open("myfile", "r")

    Ip = file:read("*l")



    *l reads 1 line from a file 1 reads one byte from a file

  4. To limit the number of characters read you can pass a number to io.read. i.e `io.read(2)`

    As for the cursor blinking and overwriting your input box you can either make your input box larger or turn the cursor blinking off with `term.setCursorBlink(false)`

  5. The lib you're looking for are cursor.lua & full_cursor.lua but I'm not sure these will do what you're seeking to accomplish I just remember hearing about them...

    Also my example was done in a way that it could be modified to control the windows(and thus the cursors) of other processes. If you just want to access the current processes window it  may be simpler with the tty lib.

    local tty = require "tty"
    local event = require "event"
    local kb = require "keyboard"
    local window = tty.window
    local handle = event.listen("touch", function(_, _, x, y)
        	window.x = x
        	window.y = y
        	print "HI"
    while true do
      local ev = { event.pull("key", nil, nil, kb.keys.q) }


  6. Was this any help? I forgot, but there is actually a cursor library in the later versions of openos that you might want to check out.. I haven't used it and I'm not familiar with it at all but that might be a better solution.

  7. okay so its a bit tricky cause i dont know what exactly you're trying to pull but ill give it a shot...

    local term = require "term"
    local kb = require "keyboard"
    local event = require "event"
    local process = require "process"
    local component = require "component"
    local window = term.internal.open() -- # creates a full screen window. optionally provide (dx, dy, width, height)
    term.bind(component.gpu, window) -- # bind the primary gpu to the window we made
    local proc = process.info() -- # get an instance of this process' details
    local handle = event.listen("touch", function(_, _, x, y) -- # this is basically your 'cursor' function
        	proc.data.window.x = x
        	proc.data.window.y = y
        	print "HI" -- # click around to see the effect
    while true do
      local ev = {event.pull("key")}
      if ev[4] == kb.keys.q then break end -- # quit the loop and basically the program
    event.cancel(handle) -- # clear the event listener

    This example can be modified to control the window of another process as well. I hope this can get you started. Ask away if this isn't very clear....

  8. Each process in openos has its own instance of a cursor. It's stored in the window property of a process I believe.. try assigning to the processes window cursor as term.setCursor will only set the cursor of the process calling it... I can't test any code ATM so you may have some exploring to do

  9. If event.listen is after a continuous loop then it wont be called until that block is finished. To use event.listen it should be called before the loop starts. Note: the loop will have to yield somehow via either event.pull or os.sleep or computer.pullSignal.

    while (some_condition) do
      doSomethingElse(more, data)
    event.listen('some_event', listener) -- # this will not run until `some_condition` above returns false or there is an error
    event.listen('some_event', listener)
    while (some_condition) do
      -- # if an event named `some_event` happens during this sleep call above then the listener will execute
      doSomethingElse(more, data)

    background stuff..

    local thread = require 'thread'
    local event = require 'event'
    local bg_proc = thread.create(function()
        print 'starting background thread..'
        while true do
          local ev = event.pull 'key'
          print 'somebody pressed something!'
    print 'starting main loop'
    local i = 0
    while true do
      i = i + 1
      print('count is ' .. tostring(i))


  10. Possible. Maybe. But definitely not practical. You would use the network card along with client and host programs on each machine. Computers dont have access to each others components so any communication can be done over a network. You can write a program on one machine to request access and write data over a network connection and another program on another machine to answer requests and read/write data from that connection. Im not really sure of another way to perform this. Perhaps others can chime in.

  11. So there are two ways to do this. The first is a little more complex. You can simply have two screens and one gpu and switch which screen the gpu is bound to and draw. The second and probably better way is to have two gpus, one for each screen.

    -- # 2 screens 1 gpu
    local component = require "component"
    local prim_screen = component.gpu.getScreen()
    local sec_screen
    -- # get the second(non primary or unbound) screen address from the dev fs
    local f = assert(io.open "/dev/components/by-type/screen/1/address")
    sec_screen = f:read "*a" -- # read the file which has the component address
    f:close() -- # clean your room
    -- # the goods
    print "this is one screen 1"
    print "gpu is bound to screen 2 now"
    print "back to screen 1"
    -- # 2 gpus
    local component = require "component"
    local gpu1 = component.gpu
    local gpu2_address, scr2_address
    for address, ctype in component.list() do
      if ctype == 'gpu' and address ~= gpu1.address then
        gpu2_address = address
      elseif ctype == 'screen' and address ~= gpu1.getScreen() then
        scr2_address = address
      if gpu2_address and scr2_address then break end -- # quit early if we have the second gpu & screen pair
    local gpu2 = component.proxy(gpu2_address)
    gpu2.bind(scr2_address) -- # bind the second screen to the second gpu
    gpu1.set(3, 3, "this is on screen 1")
    gpu2.set(3, 3, "this is on screen 2")

    Hope this gets you started. Feel free to ask more if you like :)

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