How realistic is it to write a dynamic website in Lua as a new programmer?

Basically noscript. I'm new to programming and learning C and Lua, but I'm not really sure where to start. I thought it would be fun to build a dynamic website in Lua since that would probably teach me some of the things I'd need to know for future projects, but I'd imagine that's probably over my head. Does anyone know if that's a realistic ask? If not, where should I start if I want to learn what's necessary to do something like this? Thanks!

https://redd.it/1jzoiif
@r_lua

A little help with a code fixing task!

Hello everyone!

I'm fairly new to this, but I was assigned the below corrupted code as a test to fix it, and I can't figure it out. The code in question goes as follows:

function factorial(n)
if (n == 0) then
return 1
else
return n factorial(n - 1) -- The developer did not handle negative numbers. Prevent infinite recursion. You must check if n is lower than 0 then return something. You should be returning nil. Use elseif and then else
end
end

Now, what I was able to figure out is that I need to check if n is lower than 0, then return nil, which can be done by doing this:

function factorial(n)
if (n == 0) then
return 1
elseif (n < 0) then
return nil
else
return n factorial(n - 1)
end
end

But then I was told that this is incorrect, and I can't seem to figure out why. Would anyone be so kind as to point out the mistake and tell me if it's just the coding style, or maybe it is just blatantly incorrect?

https://redd.it/1k0u4fv
@r_lua

Extended lua noscript for mpv

Hello,

I would like to make mpv play short clips as visualization, but:

- the first half of the track reversed with 0.8 speed
- then the original forward in normal speed and complete
- all videos are in subdurectories on a cloud-server
- endless play repetition

Actually, I have a code, which reverses everything and renames the originals into xxx_vorher and names the reversed into xxx_reverse. But it's always the full track in normal speed. What am I doing wrong?

Working noscript:

local utils = require 'mp.utils'
local base_folder = "C:\\Users\\ju-ra\\OneDrive - per ianua projekt eV\\mArple\\artwork\\ki"

function process_all_videos(folder)
local cmd = string.format('dir "%s" /b /s /a-d', folder)
local handle = io.popen(cmd)
local result = handle:read("*a")
handle:close()

for line in result:gmatch("[^\r\n]+") do
if line:match("%.mp4$") or line:match("%.mkv$") or line:match("%.avi$") then
if not line:match("_vorher%.") and not line:match("_reverse%.") then
local new_path = line:gsub("(%.%w+)$", "_vorher%1")
os.rename(line, new_path)

local reverse_path = line:gsub("(%.%w+)$", "_reverse%1")
local args = {
"ffmpeg", "-y",
"-i", new_path,
"-vf", "reverse",
"-af", "areverse",
reverse_path
}
mp.msg.info("Erstelle Reverse: " .. reverse_path)
utils.subprocess({ args = args, playback_only = false })
end
end
end
mp.msg.info("Alle Videos wurden umbenannt und Reverses erstellt.")
end

process_all_videos(base_folder)
mp.commandv("quit")

________________________
What I am trying to add:

local mp = require 'mp'

local started = false
local half_point = 0
local reversed = false

function reverse_and_play_forward()
if started then return end
started = true

local duration = mp.get_property_number("duration", 0)
half_point = duration / 2

-- Sprung zur Mitte und rückwärts abspielen
mp.set_property_number("speed", 1)
mp.set_property("playback-direction", "backward")
mp.commandv("seek", half_point, "absolute+exact")
reversed = true

-- Beobachte die Zeit
mp.observe_property("time-pos", "number", function(name, pos)
if reversed and pos and pos <= 0.1 then
-- Wenn Anfang erreicht, vorwärts abspielen
reversed = false
mp.set_property("playback-direction", "forward")
mp.set_property_number("speed", 1)
mp.commandv("seek", 0, "absolute+exact")
mp.unobserve_property(nil)
end
end)
end

mp.register_event("file-loaded", reverse_and_play_forward)

Thanks for every idea

https://redd.it/1k133wq
@r_lua

Looking for assistance learning FiveM development

Hello, Firstly, Thank you for taking the time to read this.

My friend & I have been working on trying to learn FiveM development for about a month now as we slowly build up a server. We have been learning mainly through reddit posts, discussions and youtube videos on how to do majority of things and it's gotten us quite far.

We're hoping this post will reach someone who has knowledge in building FiveM servers or is knowledgeable in Lua and is willing to mentor us on some of the more intricate obstacles we are struggling with such as learning how to properly use exports and integrate noscripts to communicate with each other such as notifications, MDT etc.

If this seems like something that might interest you or if you are willing to help please contact me via Discord @ dino0831 We are both eager to learn and catch on quickly. Hope to hear from you soon :)

Thank you

https://redd.it/1k2ef8j
@r_lua

Okay so im reaching out im not sure how to look up what im about to ask

Ive been getting bored with the games that i have been playing and i was told to look up the lua game on roblox but it tells you how to do it but it is confusing me just wondering if im the only one ? If you have any info much appreciated

https://redd.it/1k31xt8
@r_lua

Lua learning

I have wanted to learn lua for a while but have not had the time, but now I do, so I am just curious whether how do I start? Because I took a look at couple videos and I have to be honest I did not understand or keep in mind any of that. If you guys would send me some useful resources or a starting point to learn lua I would appreciate it.

https://redd.it/1k38fsn
@r_lua

Compiling lua

Hello I have a game where the files for lua were in .lu so I decompiled them and the decompiler doesn't have an option to compile them back into .lu so I was wondering if anyone knows of a compiler that concerts lua into .lu, btw the Lua is 5.1

https://redd.it/1k3dk0s
@r_lua

How to compile lua into .lu

I'm trying to compile lua into .lu

https://redd.it/1k3fn5f
@r_lua

Can I use custom C API functions from Lua bytecode?

I'm thinking of precompiling Lua noscripts I upload to an unmanned vehicle that has a custom C API noscript runner thing. Would this be possible/feasible?

https://redd.it/1k3x9au
@r_lua

Confused with OR operator

"if The logical operators are and, or, and not. Like control structures, all logical operators consider false and nil as false and anything else as true. The operator and returns its first argument if it is false; otherwise, it returns its second argument. The operator or returns its first argument if it is not false; otherwise, it returns its second argument:


print(4 and 5) --> 5
print(nil and 13) --> nil
print(false and 13) --> false
print(4 or 5) --> 4
print(false or 5) --> 5

Both and and or use short-cut evaluation, that is, they evaluate their second operand only when necessary."


I might be being dumb here, but as I understand OR in most operations, it evaluates true when either side is evaluated to be true, so shouldn't the last statement be printing false? I see that it says that they only evaluate the second operand when necessary, but wouldn't the first operand being false in an OR statement cause it to look at the second?

https://redd.it/1k42jt2
@r_lua

I want to learn how to code with Lua - how do I start? where do I start?

For those who have experience with Lua, how did you start? where did you start?

All I know of Lua is that it is considered "simple" and that it is used for games - I really would like to somewhat grasp Lua so I can start considering making games myself.

https://redd.it/1k4ktdk
@r_lua

Do I need require for each TU?

I'm not super familiar with LUA. I have an entry point of so called main noscript - entry.lua, I have a Logger.lua that has the tools for exactly what it says. Main noscripts has access to logger via require. Now I have to use logging tools in Events.lua - do I also need a require or because Events.lua is already "included" in main noscript the logging definitions are exposed higher up the chain and I can use them? And if I dont - any potentials side-effects form including them via require to appease luals?

https://redd.it/1k4lisq
@r_lua

A simple noscript to generate html code.

I just wanted to share this code to generate html code from lua, i made this because i don't like writing html and for fun to do something in lua. Any sugestions to improve it?

https://gitlab.com/-/snippets/4836971

https://redd.it/1k5qng1
@r_lua

Differences between Lua and LuaJIT?

Hi all. I've been a casual user of Lua for years and of LuaJIT for just a few months. I am not clear on all of the differences I need to know when writing code.

I know that integer division (//) is not implemented in LuaJIT and that LuaJIT has increased interoperability with C (which I haven't yet used). Yesterday I wrote a bit of code for LuaJIT that produces differently formatted output between Lua (5.4) and LuaJIT (5.1).

It worries me that there might be more gotchas lurking and a cheat sheet of everything a Lua programmer should know when switching to LuaJIT would be really useful (before I start diving into Lua version changes and seeing of this is a Lua version difference and not a Lua/LuaJIT difference).

Can anyone help?

https://redd.it/1k60myn
@r_lua

simulate MicroLua on Mac?

Hi all,

I'm trying to make a DS game to be run via MicroLua DS on DSi. I'm using a 2020 MacBook Pro M1 computer.


To test my program, I first tried using MicroLua Simulator https://sourceforge.net/p/microlua/wiki/MicroLuaSimulator/ but I couldn't compile it.


Then I tried Desmume, using the instructions given here: https://sourceforge.net/p/microlua/wiki/DeSmuME/ but the gba slot it mentions was nowhere to be found.


what do?

https://redd.it/1k69cww
@r_lua

I need help making a roblox noscript
https://redd.it/1k72ug3
@r_lua

is there a way i can make my noscript smaller?

i'm new to lua i just made a rock paper scissors game but i want to make the noscript smaller is there a way i can do that?
math.randomseed(os.time())



table = {"rock", "paper", "scissors"}



number = math.random(1, 3)



print ("Welcome to Rock Paper Scissors!\nChoose Your Move!")



move = string.lower(io.read("*l"))



if move == "rock" then

if number == 1 then

print("Tie!")

elseif number == 2 then

print ("You Lose!")

else

print ("You Win!")

end

end

if move == "paper" then

if number == 1 then

print("You Win!")

elseif number == 2 then

print ("Tie!")

else

print ("You Lose!")

end

end

if move == "scissors" then

if number == 1 then

print("You Lose!")

elseif number == 2 then

print ("You Win!")

else

print ("You Lose!")

end

end

print (table[number])

https://redd.it/1k83lvu
@r_lua

working on a laser targeting system. i am using a public lua radar that has the option to mark as a friendly(iff) or a target (lok) and i added a laser locking mode. it works except that it marks them as friendly's not target's. for stormworks

T={}F={}MT=10;MD=200;pi2=math.pi*2;p4=pi2/4;m=0;w,h=0,0;c=math.cos;r=table.remove;s=math.sin;srt=math.sqrt;tria=screen.drawTriangleF;sdc=screen.drawCircle;ot=output.setNumber;ip=input.getNumber;stc=screen.setColor;dL=screen.drawLine;function clr()for a,b in pairs(T)do b.lok=false end end;sb=output.setBool;function onTick()u,l=0,0;isP=input.getBool(2)tx=ip(23)ty=ip(24)cm=math.fmod((ip(22)+1.25)*pi2,pi2)Gx=ip(25)Gy=ip(26)rg=ip(28)alt=ip(29)ro=ip(30)*pi2;ptc=ip(31)*pi2;n=4;while n<12 do fx=ip(n)fy=ip(n+1)fz=ip(n+2)table.insert(F,{x=fx,y=fy,z=fz})n=n+3 end;if isP then t=idx(T,tx,ty)if t\~=nil then clr()sb(2,true)T[t\].lok=true else clr()sb(2,false)end end

\------------ laser mode start

select_x = input.getNumber(7)

select_y = input.getNumber(8)



if select_x \~= 0 and select_y \~= 0 then

local foundTarget = idx(T, select_x, select_y)

if foundTarget \~= nil then

clr()

T[foundTarget\].lok = true

sb(2, true)

end

end

\---------------laser mode end

;tg={tgt=input.getBool(1),d=ip(1),az=ip(2)*pi2,el=ip(3)*pi2,ttl=100,hd=0,spd=1,spdx=1,spdy=1,spdz=1,ti=m,br=0,lok=false,iff=false}h_dst=tg.d*c(tg.el)tg.tgx,tg.tgy,tg.tgz=cpT(Gx,Gy,alt,tg,ro,ptc,cm)if tg.tgt and h_dst>30 and h_dst<rg then e_t=nil;nrdst=math.huge;ni=nil;for e,f in ipairs(T)do px,py=nil,nil;dlt=(tg.ti-f.ti)/60;dist=srt((f.tgx-tg.tgx)\^2+(f.tgy-tg.tgy)\^2+(f.tgz-tg.tgz)\^2)if f.spd>50 then px=f.tgx+f.spdx*dlt;py=f.tgy+f.spdy*dlt;pz=f.tgz+f.spdz*dlt end;if px==nil or py==nil then if dist<=MD and dist<nrdst then nrdst=dist;e_t=f;ni=e end else sph=srt((tg.tgx-px)\^2+(tg.tgx-py)\^2+(tg.tgx-pz)\^2)if sph<=MD or dist<MD then e_t=f;ni=e end end end;if e_t then rz=tg.d/rg;tg.x=w/2+rz*w*2*math.cos(tg.az-p4)tg.y=h+rz*h*2*math.sin(tg.az-p4)dq=srt((tg.tgx-e_t.tgx)\^2+(tg.tgy-e_t.tgy)\^2+(tg.tgz-e_t.tgz)\^2)dlt=(tg.ti-e_t.ti)/60;spdx=(e_t.tgx-tg.tgx)/dlt;spdy=(e_t.tgy-tg.tgy)/dlt;spdz=(e_t.tgz-tg.tgz)/dlt;spd=srt(spdx\^2+spdy\^2)e_t.d=tg.d;e_t.az=tg.az;e_t.el=tg.el;e_t.x=tg.x;e_t.y=tg.y;e_t.ttl=100;e_t.iff=tg.iff;if dq>20 and math.abs(spd-e_t.spd)<200 then e_t.tgz=tg.tgz;e_t.tgy=tg.tgy;e_t.tgx=tg.tgx;e_t.spd=spd;e_t.spdx=spdx;e_t.spdy=spdy;e_t.spdz=spdz;hdg=cdH(e_t,tg)e_t.hd=hdg end;e_t.ti=tg.ti else if ni then r(T,ni)end;tg.id=#T+1;table.insert(T,tg)end end;if#T>MT then r(T,1)end;for a,tg in pairs(T)do for a,n in ipairs(F)do d=srt((tg.tgx-n.x)\^2+(tg.tgy-n.y)\^2+(tg.tgz-n.z)\^2)if d<50 then tg.iff=true end end;r_=tg.d/rg;h_dst=tg.d*c(tg.el)tg.x=w/2+r_*w*2*c(tg.az-p4)tg.y=h+r_*h*2*s(tg.az-p4)tg.ttl=tg.ttl-1;if tg.ttl<=0 then r(T,a)end;if h_dst>rg then r(T,a)end;if tg.lok then ot(7,tg.spd)ot(8,math.deg(tg.hd))ot(1,tg.tgx)ot(2,tg.tgy)ot(3,tg.tgz)ot(10,tg.az)ot(11,tg.el)end end;ot(5,#T)m=m+1 end;function onDraw()w=screen.getWidth()h=screen.getHeight()stc(0,255,0,255)for i,b in pairs(T)do dh(b,i)end end;function dh(tg,i)xd,xy=tg.x,tg.y;o=tg.hd;if tg.iff then stc(0,255,255,tg.ttl+150)else stc(0,255,0,tg.ttl+150)end;g=2;if tg.tgz>200 then g=3 elseif tg.tgz>400 then g=5 end;x1,y1=xd+g*c(o),xy+g*s(o)o=o+2*math.pi/3;x2,y2=xd+g*c(o),xy+g*s(o)o=o+2*math.pi/3;x3,y3=xd+g*c(o),xy+g*s(o)if tg.tgz<50 then if tg.lok then stc(255,150,0)screen.drawText(xd-4,xy,"[+\]")else screen.drawText(xd,xy,"+")end else if tg.lok then stc(255,150,0)tria(x1,y1,x2,y2,x3,y3)else screen.drawTriangle(x1,y1,x2,y2,x3,y3)end;dL(x1,y1,x1+4*s(tg.hd+p4),y1-4*c(tg.hd+p4))end end;function cdH(o,n)hd=cm-math.atan(n.spdy-o.spdy,n.spdx-o.spdx)-p4;return hd end;function idx(j,k,p)for e,b in pairs(j)do if k<=b.x+2 and k>=b.x-2 and p<=b.y+2 and p>=b.y-2 then return e end end;return nil end;function idM()return{{1,0,0,0},{0,1,0,0},{0,0,1,0},{0,0,0,1}}end;function mxM(j,q)ra=idM()for e=1,4 do for v=1,4 do sum=0;for i=1,4 do sum=sum+j[e\][i\]*q[i\][v\]end;ra[e\][v\]=sum end end;return ra end;function

mxapp(m,k,p,x)rx=m[1\][1\]*k+m[1\][2\]*p+m[1\][3\]*x+m[1\][4\]ry=m[2\][1\]*k+m[2\][2\]*p+m[2\][3\]*x+m[2\][4\]rz=m[3\][1\]*k+m[3\][2\]*p+m[3\][3\]*x+m[3\][4\]return rx,ry,rz end;function mRx(j)return{{1,0,0,0},{0,c(j),-s(j),0},{0,s(j),c(j),0},{0,0,0,1}}end;function mRy(j)return{{c(j),0,s(j),0},{0,1,0,0},{-s(j),0,c(j),0},{0,0,0,1}}end;function mRz(j)return{{c(j),-s(j),0,0},{s(j),c(j),0,0},{0,0,1,0},{0,0,0,1}}end;function mxT(k,p,x)return{{1,0,0,k},{0,1,0,p},{0,0,1,x},{0,0,0,1}}end;function cpT(y,z,A,tg,r,B,p)mxc=mxM(mxT(y,-z,A),mxM(mRz(-p),mxM(mRy(-B),mRx(-r))))Txr=tg.d*c(tg.az)*c(tg.el)tyr=tg.d*s(tg.az)*c(tg.el)tzt=tg.d*s(tg.el)Tx,Ty,Tz=mxapp(mxc,Txr,tyr,tzt)return Tx,-Ty,Tz end

https://redd.it/1k84z5n
@r_lua

Official Lua Mascot
https://redd.it/1k89y7q
@r_lua

I made a little rock paper scissors program inspired by a recent post

Idk why but seeing this post https://www.reddit.com/r/lua/s/eWJooyqrJZ
Just gave me an itch to remake it, anyway:

local moves = {
    rock = {rock = "Draw", paper = "Loss", scissors = "Win!"},
    paper = {rock = "Win!", paper = "Draw", scissors = "Loss"},
    scissors = {rock = "Loss", paper = "Win!", scissors = "Draw"}
}

local function GetRandMove(randNum)
    local n = 0
    local randNum = math.random(1, 3)
    for k, _ in pairs(moves) do
        n = n + 1
        if randNum == n then return k end
    end
end

local function sleep(n)
    local t = os.time() + n
    while os.time() < t do end
end

print([[

Time to Play:

--------
rock
paper
scissors
--------
]])

while true do
    print("\nYour Move: ")

    local PlayerInput = io.read()
    local BotMove = GetRandMove()
    
    print(BotMove, "\n")
    
    sleep(.2)

    print(moves[PlayerInput][BotMove])

    sleep(.4)

    ::playagain::

    print("\ntype y to play again or x to quit: \n")

    local playAgain = io.read()

    if playAgain == "x" then
        print("Goodbye!")
        break
    elseif playAgain == "y" then
        print("\nAlright!\n")
    else
        goto playagain
    end
end

https://redd.it/1k8gezl
@r_lua