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

Yo guys, I have a question about the book

Is the book still relevant? And do you think it's worth buying or should I focus on learning from the internet?

https://redd.it/1k8jpsx
@r_lua

I'm trying to make a nice TV weather app, to show the potential and validate my cross-platform framework.
https://redd.it/1k8t3z7
@r_lua

Is there ANY difference between these two Lua snippets?

Snippet 1:

local function f(x,y)
local y = y or 1 -- Note: "local" here.`
do_something(x,y)
end

Snippet 2:

local function f(x,y)
y = y or 1 -- Note: no "local" here.
do_something(x,y)
end

I know why this pattern is often used but is there any situation whatsoever where these two snippets do not behave identically? If Lua version matters, I am specifically interested in LuaJIT. Also, if it matters, let's assume x and y are simple Lua values. They are **not** objects and don't have metatables.

https://redd.it/1k93frj
@r_lua

Where can i learn luau?

I am a very early stage roblox game developer and I need to know where is the best option to learn luau. I have been on the same youtube, there are few lessons. I read the documentation - it is unclear. What do you suggest me to do? Maybe I'm writing to the wrong community, but I still need help.

https://redd.it/1k9bqjt
@r_lua

Can nested loop have different types of loops within?

for example

for initialization, min/max value, iteration --yes this is numeric for idc
do
--insert stuff for 1st loop
while (condition)
do
--insert stuff for 2nd loop
repeat
--insert stuff for 3rd loop
until (condition)
end
end

i was wondering if it's possible to do so, since in many instance, nested loops will use loops of the same type...

https://redd.it/1k9ci93
@r_lua

Lua by example?

I'm thinking of developing a Lua by example. Is this something the community would like to see?

https://redd.it/1k9qek4
@r_lua

Is there robllox noscript to face fuc?



https://redd.it/1kbd621
@r_lua

Advice

Hi. New here. And to Lua as a whole. I am currently learning Lua to embed it into C++ and possibly use it together with the C++ inline assembler for game development. However Lua is not a walk in the park. The basics of Lua are. And I am stuck there. The basics. Actually, outside of the basic input output, data type conversions (Tostring/tonumber), io.open()/ file:read() / file:close(), os.execute() and maybe "require", i cant say i understand much else.. Trust me i tried but this isnt as easy as promised.. Lua has a very special complexity surrounding it that you only discover after starting..

What advice do you have for a freshman college student like me learning Lua. I should add this is not a part of the program I am doing. Its just a personal interest. How did you master Lua or at least know enough of it to produce a game in it either in pure Lua or Lua embedded in C.

https://redd.it/1kbpn57
@r_lua

The first stage of my indie game, made with my own engine, is ready

The game https://reprobate.carimbo.run

Made with Carimbo, a home made (by me) 2D engine.

https://github.com/willtobyte/carimbo

The game is written in Lua.

Pixel Art by Aline

https://linktr.ee/dandelion.pixelart

Any feedback is more than welcome.

https://redd.it/1kc9rw7
@r_lua

trying to rewrite lua-resty-fastcgi but it fails to connects

I am trying to rewrite FastCGI extension which was written for Lua Resty module of NGINX by benagricola, but it keeps on failing to connect to any PHP-FastCGI server (throws fastCGI : recv header error: closed which means that FastCGI is not available) i tried adjusting the timeout but it didn't work

I am using the extension like this

set $cginoscriptname '';

location ~ ^/@FastCGI(/+)?(((a-zA-Z0-9\_\-+(/+))+)?(a-zA-Z0-9\-\_+\.a-zA-Z0-9+))? {
internal;
ifmodifiedsince off;
contentbyluablock {
local fastcgi = require "fastcgi"
local fcgi = setmetatable({}, fastcgi)

fcgi:connect("127.0.0.1", 25680)

local ok, err = fcgi:request({
noscriptfilename = ngx.var"document_root" .. ngx.var"cgi_noscript_name",
noscriptname = ngx.var["cginoscriptname"],
documentroot = ngx.var"document_root",
serverport = ngx.var["balancerport"],
pathinfo = ngx.var["fastcgipathinfo"],
querystring = ngx.var"query_string",
requesturi = ngx.var["requesturi"],
documenturi = ngx.var["requesturi"],
serverprotocol = ngx.var["serverprotocol"],
requestmethod = ngx.var["requestmethod"],
geoip2datacountrycode = ngx.var["geoip2datacountrycode"],
geoip2datacountryname = ngx.var["geoip2datacountryname"],
geoip2datacityname = ngx.var["geoip2datacityname"]
}, {
cachedict = "fastcgiCache",
cachevalid = 300,
keepalive = true,
keepalivetimeout = 120000,
keepalivepoolsize = 100,
hideheaders = { "X-Powered-By", "X-Page-Speed", "X-Application-Version", "X-Varnish", "Last-Modified", "Cache-Control", "Vary", "X-CF-Powered-By" },
intercepterrors = true,
readtimeout = 60000,
cacheMethods = { "GET" },
headerchunksize = 50 1024,
body_chunk_size = 30 1024
})
if not ok then
ngx.exit(ngx.HTTPBADGATEWAY)
end
}
include /etc/nginx/fastcgiparams;
accesslog on;
}

and in my PATH Resolver (off-topic, but I have to include it in my question)

local uri = ngx.var"request_uri" or "/"
if type(uri) ~= "string" then
ngx.log(ngx.ERR, "URI is not a string: ", type(uri))
uri = "/"
end
ngx.log(ngx.DEBUG, "Request URI: ", uri or "Unknown!")
ngx.log(ngx.DEBUG, "URI: ", ngx.var"uri" or "Unknown!")

local PATH = ngx.var"document_root" .. uri
local PATH = string.match(PATH, "^[^?]*")
if not PATH or PATH == 1 then
PATH = PATH
end
local file, err = io.open(PATH, "rb")
if not file then
ngx.log(ngx.ERR, "Failed to open file: " .. err)
ngx.status = ngx.HTTPNOTFOUND
ngx.exit(ngx.HTTPNOTFOUND)
return
end
file:close()

ngx.var["cginoscriptname"] = ngx.var["uri"]
local res = ngx.location.capture("/@FastCGI", {
-- method = ngx.HTTPGET,
args = ngx.var"args",
})
ngx.status = res.status
for k, v in pairs(res.header) do
ngx.headerk = v
end
ngx.print(res.body)
ngx.log(ngx.DEBUG, "#1 : " .. uri)

and my extension fork

local ngx = require "ngx"
local bit = require "bit"
local binutil = require 'resty.binutil'

local M = {}
M.index = M

local FCGI = {

HEADERLEN = 0x08,