Loading a text file

General
1

All - anyone opened and read a text file recently with the new asset system. Been playing around with this but can’t get it right… general approach I am looking for is to open a file and read it into an array then I can interpret each line separately, with Lua seems to be:


local file = io.open("your-file-name", "r");
local data = file:read("*a")
local file = io.open("file-name", "r");
 local arr = {}
 for line in file:lines() do
    table.insert (arr, line);
 end

Anyone tried this in Codea? Every time I get into io.open etc I struggle to get the syntax correctly. The other thing is that Codea treats. File.txt as file_txt in the asset system.

2

@Bri_G Here’s some code to do a hex dump. Change the file name in readText().

-- hex dump

viewer.mode=FULLSCREEN

function setup()
    dy=0
    font("Courier")
    textMode(CORNER) 
    fill(255)
    tab={}
    str=readText(asset.documents.Dropbox.text1)
end

function draw()
    background(0)
    for z=1,#str,16 do
        text(string.format("%5d:",z-1),30,HEIGHT-25*(z//16+1)+dy)
        for s=1,16 do
            v=str:byte(z+s-1)
            if v~=nil then
                ch=""
                if v>31 and v<128 then
                    ch=string.char(v)
                end
                if s<9 then
                    a=string.format("%02x ",v)
                    text(a,25*s+100,HEIGHT-25*(z//16+1)+dy )                    
                    text(ch,12*s+550,HEIGHT-25*(z//16+1)+dy )
                    if s==8 then
                        text("-",25*s+123,HEIGHT-25*(z//16+1)+dy )
                    end
                else
                    a=string.format("%02x ",v)
                    text(a,25*s+110,HEIGHT-25*(z//16+1)+dy )                
                    text(ch,12*s+550,HEIGHT-25*(z//16+1)+dy )
                end
            end
        end      
    end
end

function touched(t)
    dy=dy+t.deltaY
    if dy<0 then
        dy=0
    end
end
3

@Bri_G Or maybe this is what you’re after.

function setup()
    tab={}
    file=os.getenv("HOME").."/Documents/Dropbox.assets/text1.txt"
    readBinary()
    print(table.concat(tab," "))
    print("done")
end

function draw()
    background(40,40,50)
end

function readBinary()
    local bFd = io.open(file,"rb")
    local bData = ""
    if bFd then
        while true do
            local data = bFd:read(512) -- Read 512 bytes at a time
            if not data then
                break
            end
            bData = bData..data
        end
        bFd:close()
    end
    for i=1,string.len(bData) do
        x=bData:byte(i)
        if x>32 and x<128 then
            table.insert(tab,string.format("%02x-%s ",x,string.char(x)))
            else
            table.insert(tab,string.format("%02x-- ",x))
        end
    end
end
4

@dave1707 - wow, pretty impressive but not quite what I am seeking. But, the addressing in setup() was interesting. I was looking at io.lines and that may be the key I needed. Also, I have managed to read the file line by line by using readText(). Now looking at deciphering the text in each line trying to re-write it in another format. Thanks for that.

Will post code later when I manage it.