Print .2dja poster easily!

post.lua

-- By Sammy (1Turtle)
-- Licence: The Unlicence

-- Get poster printer
local poster = peripheral.find("poster_printer")
if not poster then
    error("A poster printer is required.")
end

-- Print usage
local tArgs = { ... }
if #tArgs == 0 then
    local programName = arg[0] or fs.getName(shell.getRunningProgram())
    print("Usage: " .. programName .. " <file.2dja>")
    return
end

-- Error checking
local sPath = shell.resolve(tArgs[1])
if not fs.exists(sPath) then
    error("File does nto exist.")
elseif fs.exists(sPath) and fs.isDir(sPath) then
    error("Cannot edit a directory.")
end

local file = fs.open(sPath, 'r')
local content = file.readAll()
file.close()

-- Load file
term.write("Please wait... ")
content = textutils.unserialiseJSON(content)
if type(content) ~= "table" then
    error("File seems to be corrupt.")
end
print("READY")

local bRunning = true
local total = ""..#(content.pages)
local page
local index = 1
-- Setup cursor
local nX,nY = term.getCursorPos()
if nY >= 19-5 then
    term.scroll(5)
    nY = nY-5
end
nX = 1
term.setBackgroundColor(colors.black)
term.setTextColor(colors.white)

local oldStatus, oldProgress = "", ""
parallel.waitForAny(
function()
    -- Print loop
    for i,p in pairs(content.pages) do
        -- Wait until ready
        while poster.status() == "busy" do
            sleep(0.25)
        end

        index = i
        page = p
        -- Poster
        poster.reset()
        if page.label then poster.setLabel(page.label) end
        if page.tooltip then poster.setTooltip(page.tooltip) end
    
        poster.blitPalette(page.palette)
        poster.blitPixels(1,1, page.pixels)
    
        poster.commit(1)

        sleep()
    end
    bRunning = false
end,
function()
    while bRunning do
        if type(page) == "table" then
            -- Status
            term.setTextColor(colors.gray)
            term.setCursorPos(nX,nY)
            term.clearLine()
            term.write("Printing:")
            term.setCursorPos(nX,nY+1)
            term.clearLine()
            term.setTextColor(colors.lightGray)
            term.write(" Name: ")
            term.setTextColor(colors.white)
            term.write(("%s"):format(page.label or "???"))
            term.setCursorPos(nX,nY+2)
            term.clearLine()
            term.setTextColor(colors.lightGray)
            term.write(" Size: ")
            term.setTextColor(colors.white)
            term.write(("%sx%spx"):format(""..page.width, ""..page.height))
            term.setCursorPos(nX,nY+3)
            term.clearLine()
            term.setTextColor(colors.lightGray)
            term.write(" Index: ")
            term.setTextColor(colors.white)
            term.write(("%s of %s"):format(""..index, total))
            local status,progress = poster.status()
            if status ~= oldStatus or tostring(progress) ~= oldProgress then
                progress = tostring(progress)
                oldStatus = status
                oldProgress = progress
                
                term.setCursorPos(nX,nY+4)
                term.clearLine()
                term.setTextColor(colors.lightGray)
                
                term.write(" Progress: ")
                term.setTextColor(colors.white)
                if status == "busy" and progress == "0" then
                    term.setTextColor(colors.red)
                    term.write("Paper jam")
                else
                    term.write(("%s (%s)"):format(status, progress))
                end
            end
        end
        sleep(0.25)
    end
end
)

nice