Cobalt Installer

local dlPath = "https://raw.githubusercontent.com/ebernerd/Cobalt/master/"
local args = { ... }
local beta = false
if args[1] == "beta" then
  dlPath = "https://raw.githubusercontent.com/ebernerd/Cobalt/beta/"
  beta = true
end

local dx, dy = term.getSize()

local function centerPrint( text, y )
    term.clear()
    term.setCursorPos( 1, 1 )
    if beta then
        write( "Cobalt Beta Version Installer" )
    end
    local t = {}
    for i in string.gmatch( text, "%S+" ) do
        t[#t+1] = i
    end
    local lines = {[1] = ""}
    local line = 1
    for i=1, #t do
        if #tostring(lines[line].." "..t[i]) > dx then
            lines[line] = lines[line] .. "\n"
            line = line + 1
            lines[line] = " " .. t[i]
        else
            lines[line] = lines[line] .. " " .. t[i]
        end
    end
    y = y or math.ceil(dy/2-#lines/2)
    for i = 1, #lines do
        term.setCursorPos( dx/2-#lines[i]/2, y+(i-1))
        print( lines[i])
    end
end

local function getFile( file, path )
    centerPrint( "Downloading " .. file .. " to \"" .. path .. "\"")
    local dl = http.get( dlPath..file )
    local h = dl.readAll()
    dl.close()

    local f = fs.open( path, "w" )
    f.write( h )
    f.close()
end

local function clear( colour )
    term.setBackgroundColour( colour or term.getBackgroundColour() )
    term.clear()
    term.setCursorPos( 1, 1 )
end

local function yn()
    local l = true
    while l do
        local event, key = os.pullEvent()
        if event == "key" then
            if key == 21 then
                return true
            elseif key == 49 then
                return false
            end
        end
    end
end

if beta then
    term.setTextColour( colours.grey )
    clear( colours.grey )
    centerPrint( "Beta access is currently closed. Run again without the beta argument." )
    sleep( 1 )
    os.pullEvent("key_up")
    clear( colours.black )

else
    term.setTextColour( colours.white )
    clear( colours.grey )
    centerPrint( "Downloading Cobalt v1.1_3" )
    sleep(0.5)
    getFile( "cobalt", "cobalt" )
    getFile( "cobalt-lib/surface", "cobalt-lib/surface" )
    sleep(0.5)
    centerPrint( "Would you like to download \"Cobalt-UI\", a UI library for Cobalt? (y/n)")
    if yn() then
        print()
        print( "Starting Cobalt-UI download...")
        getFile( "cobalt-ui/init.lua", "cobalt-ui/init.lua" )
        getFile( "cobalt-ui/elements/button.lua", "cobalt-ui/elements/button.lua" )
        getFile( "cobalt-ui/elements/checkbox.lua", "cobalt-ui/elements/checkbox.lua" )
        getFile( "cobalt-ui/elements/radio.lua", "cobalt-ui/elements/radio.lua" )
        getFile( "cobalt-ui/elements/input.lua", "cobalt-ui/elements/input.lua" )
        getFile( "cobalt-ui/elements/panel.lua", "cobalt-ui/elements/panel.lua" )
        getFile( "cobalt-ui/elements/text.lua", "cobalt-ui/elements/text.lua" )
        getFile( "cobalt-ui/elements/textarea.lua", "cobalt-ui/elements/textarea.lua" )
        centerPrint( "Download of Cobalt-UI complete!")
        sleep(0.5)
    end
    centerPrint( "There are no other Cobalt packages as of yet. Enjoy Cobalt!")
    sleep(2)
    centerPrint( "Press any key to exit the installer")
    os.pullEvent('key_up')
    clear( colours.black )
end