CC: cat.lua

local args = {...}

if #args == 0 then
    error("Usage: cat <file> [file2] [file3...]")
end

local function ends_with(str, ending)
    return ending == "" or str:sub(-#ending) == ending
end

local w,h = term.getSize()

local function nextLine()
    local x,y = term.getCursorPos()
    if y == h then
        term.scroll(1)
    else
        y = y + 1
    end
    term.setCursorPos(1, y)
end

for _,path in ipairs(args) do
    if not fs.exists(path) then
        error("cat: file not found: " .. path, 0)
    end
    local file = fs.open(path, "r")
    local content = file.readAll()
    write(content)

    if not ends_with(content, "\n") then
        local bg = term.getBackgroundColor()
        local fg = term.getTextColor()
        term.setBackgroundColor(colors.white)
        term.setTextColor(colors.black)
        term.write("%")
        term.setBackgroundColor(bg)
        term.setTextColor(fg)
    end
    nextLine()
    file.close()
end