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IRC log for #minetest, 2022-03-02

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Time Nick Message
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00:27 Parnikkapore_m ^ re yggdrasil the lag can get up to ~300ms if you're connecting to a server across the world, also the occasional ping spike
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01:19 Yad luatic: is there a way to convert a table to a string? In standard Lua there appears to be a `to_string()` function.
01:21 Yad There seems to be a global `tostring()` function in Minetest.
01:21 Yad And I do get some hexidecimal as a string when I use `minetest.chat_send_all(tostring(this_player:hud_get_flags()))`
01:22 MTDiscord <Jonathon> if your debuging, use dump()
01:22 MTDiscord <Jonathon> minetest.chat_send_all(dump(cursed_table_that_is_causing_me_trouble))
01:22 Yad Oooh, thanks!
02:01 Yad Is there currently only possible to have one moon?
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02:02 Yad (Or could I theoretically rig the skybox to have more than one object move across the sky at night?)
02:02 Yad I suppose the whole sky moves, so I could simply paint a single moon texture across the whole sky, the multiple moons simply would be unable to move at different speeds for different orbital radii.
02:03 Yad *single texture showing multiple celestial bodies
02:19 erlehmann Yad or you switch the skybox like a boss
02:19 Yad erlehmann: :D :D :D
02:19 erlehmann not sure how jarring that would be
02:19 Yad hahahaha, we shall see
02:19 Yad shall see what the skybox framerate is >:D
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02:20 erlehmann yes do it
02:20 Yad ^^
02:20 erlehmann also please tell x2048 that you want shadows to respect this
02:20 Yad heheheheh
02:20 Yad and patch Irrlicht while I'm at it to allow colored light sources :P
02:21 Yad (probably my top feature desire is colored light sources)
02:27 Yad erlehmann: I get a strange error about trying to perform arithmetic on a boolean when I use `minetest.chat_send_all(dump(this_player:get_sky()))`
02:27 Yad as though `dump()` isn't compatible with the data structure?
02:28 erlehmann i have no idea why you ask me, but try dump2
02:28 erlehmann like if dump() is not good enough, try dump2()
02:28 erlehmann the dumpening
02:28 erlehmann this is not a joke btw
02:29 erlehmann also use minetest.debug() for debug stuff srsly
02:29 Yad Oh, I asked you because you're active in the chat. :) I try to put names in my messages so I don't assume people are having a sound effect or other notification every time there is a message
02:29 Yad And thank you, I was not familiar with `dump2()`
02:30 MTDiscord <Jonathon> doesnt get_sky return multiple args?
02:30 MTDiscord <Jonathon> and dump2 is for objects
02:30 Yad Jonathon: "`get_sky()`: returns base_color, type, table of textures, clouds."
02:30 MTDiscord <Jonathon> i can read the api as well as you can
02:30 Yad Jonathon: Of course you can but I didn't want to assume you had it open. :)
02:31 Yad Also reading it into the logs here.
02:31 Yad As I hope there will be a more descriptive description in future versions of Lua_API.txt ^_~
02:31 Yad Which I will be happy to contribute once I understand better the function. :)
02:31 MTDiscord <Jonathon> pack it in a table
02:32 Yad Ooooh, yeah!
02:32 MTDiscord <Jonathon> minetest.chat_send_all(dump({this_player:get_sky()}))
02:32 Yad Indeed. ^^ So subtle, yet so effective.
02:35 MTDiscord <Jonathon> if you get to be lazy like me, just have debug statement pasted at the top of your mod that is like function cout(...) minetest.chat_send_all(dump({...})) end and then you can be lazy testing in game with //lua and do //lua cout(thing)
02:36 MTDiscord <Jonathon> obviously remove before commiting
03:10 Yad Jonathon: Good point. :)
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04:49 Yad It's harmless but funny that dump() outputs color tables as r,b,a,g instead of r,g,b,a heheheh
04:49 Yad I mean r g b can be in any order I suppose, but alpha is clearly a separate concept from primary colors
04:50 Yad so to have it in the midst of them is an oddity
04:50 MTDiscord <Jonathon> its dumping them in the order it finds the keys
04:50 MTDiscord <Jonathon> there named so there is no defined order as compared to numerical keys
04:50 Yad Jonathon: oooh, so the anomaly is in the C++ of Minetest?
04:51 Yad Yeah, the labeling is what I meant by harmless :)
04:51 Yad since they get addressed by label usually i'd imagine
04:51 MTDiscord <Jonathon> there is no anomaly, and it would be in the C of lua
04:54 MTDiscord <Jonathon> https://github.com/minetest/minetest/blob/master/builtin/common/misc_helpers.lua#L124-L168
04:54 MTDiscord <Jonathon> (i)pairs iterator
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05:08 Yad Jonathon: Thank you for the definition citation :)
05:09 Yad Jonathon: Speaking of defined functions (or events) is there an equivalent of the `on_step` event for players? I only see it for entities.
05:09 MTDiscord <Jonathon> on
05:09 MTDiscord <Jonathon> *no
05:09 MTDiscord <Jonathon> you have to use a globalstep and loop through all the players
05:10 Yad Oooh, okay. Well that's better than having to attach an entity to the player to track steps. :)
05:10 Yad (of course I do mean program steps not "footsteps" or something)
05:10 MTDiscord <Jonathon> honestly, best way to do it depends on your usecase
05:10 Yad yep, but thank you now I know there is a `minetest.register_globalstep(function(dtime))`
05:11 MTDiscord <Jonathon> if your a game and multiple parts want to do stuff on step, your probably best building a core globalstep that adds in a on_step, and then every mod after that adds onto that on_step method
05:12 Yad interesting
05:13 Yad something I will probably understand better as I continue to experiment :)
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05:58 Yad Would this make any sense for checking if an entity is attached? `on_step = function(self) if self.ref:get_attach() ~= nil then`
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06:36 Yad Of of course! It's supposed to be `self.object` just as when using `set_attach()` hahah
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15:39 Yad Anybody know of a good learning example for custom skyboxes? I suppose it's my own weakness in Lua which makes it challenging to keep track of all the nested properties tables. xD
15:40 Yad Apparently colors need to be defined as their hexadecimal strings?
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15:40 Yad less `this_player:set_sky({day_sky = {r=0,g=0,b=0}}` and more `this_player:set_sky({base_color = "#000000",})` ?
15:40 ShadowBot Yad: Error: That URL raised <HTTP Error 404: Not Found>
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15:42 erlehmann Yad look at skybox handling in mcl2 or some better-written weather/dimension mods
15:42 Yad I thought it would be effective to study MineClone2 because that has different skyboxes depending on y-coords, but it has so much of its on infrastructure built on top of the base Lua API...oh hhahah hey :D
15:42 Yad erlehmann: ...so much built on top of the base Lua API that I struggle to trace any sense of it.
15:43 erlehmann mcl2 code is generally a big ball of mud
15:43 Yad erlehmann: heheheh, I'm glad we understand each other :D
15:44 erlehmann Yad check out some weather mods then
15:44 erlehmann i think there is one that makes cool skyboxes, wait
15:44 Yad erlehmann:  Yep.
15:44 erlehmann i search it
15:44 Yad Thanks :)
15:44 erlehmann https://content.minetest.net/packages/sofar/skybox/
15:44 erlehmann this thing is p epic
15:45 Yad Yay! Thank you erlehmann
15:45 erlehmann :)
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17:04 MinetestBot [git] sfan5 -> minetest/minetest: Fix segfault with autoscale_mode (again) f2d1295 https://github.com/minetest/minetest/commit/f2d1295fe646105f1b98b0c204f47f781336e211 (2022-03-02T16:49:45Z)
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18:42 Yad erlehmann: the skybox mod you suggested, has things like `player:set_sky("white", "regular")`
18:42 Yad set_sky actually able to take words as colors like that?
19:00 erlehmann not for long if zughy gets their will lol
19:00 erlehmann i think then it will take a table?
19:00 erlehmann Yad i know literally nothing about this topic
19:00 erlehmann please ask the author of the mod, sofar
19:01 MTDiscord <luatic> set_sky now has a more advanced parameter format, but I guess the old format is still supported
19:01 MTDiscord <luatic> you should use the new format though, in case they decide to remove the (possibly deprecated?) old format
19:01 erlehmann luatic, yeah, but zughy is in the “make it backwards-incompatible even if you can afford to keep the 4 lines that implement it forever” club
19:01 MTDiscord <luatic> about the colors: colorspecs can be colorstrings; colorstrings can be named colors
19:02 erlehmann do we have a list of those colors?
19:02 erlehmann i mean i have used them
19:02 erlehmann but mor like
19:02 erlehmann black and red and white
19:02 MTDiscord <luatic> this makes them slightly awkward to implement (you need a CSS named colors lookup table) but it's fine
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19:02 erlehmann wait it is css named colors? lol
19:02 MTDiscord <luatic> https://github.com/appgurueu/modlib/blob/master/minetest/colorspec.lua#L9-L158
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19:15 Teckla For those interested, here's how I replaced that complex and dodgy regular expression. https://www.irccloud.com/pastebin/XEujz2TH/
19:15 Teckla Ack!  Wrong channel.  I'm sorry.
19:27 MTDiscord <luatic> I want to know your RegEx now
19:28 MTDiscord <luatic> Because if a RegEx can be applied, it is usually preferable over replicating RegEx functionality in code
19:28 MTDiscord <luatic> Teckla ^
19:28 MTDiscord <luatic> NVM, in this case not using a RegEx is reasonable
19:37 Teckla luatic: User supplied JS expression, it might be designed purposefully malicious, to cause a DoS in the regex (stack overflow, memory overflow, CPU pegged, etc.)
19:56 erlehmann luatic you are missing rebeccapurple https://drafts.csswg.org/css-color/#valuedef-rebeccapurple
19:56 erlehmann Teckla a user supplied expression should NEVER be able to confuse a regular automaton
19:57 erlehmann Teckla if that is even possible, you are probably using the wrong approach entirely
19:57 erlehmann Teckla are you sure that the computational power is regular and not more?
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19:59 Guest47 hola
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20:09 Teckla I am but a small cog in a big, big, big, big, BIG organization/company, none of this was designed or written by me, originally, heh
20:09 Teckla I am just fixing this one, narrow issue, so that customers cannot accidentally DoS the system
20:26 Calinou ReDoS is very much a real issue, people are still regularly patching it out in modern regex libraries
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20:27 debiankaios hi somebody here
20:31 Calinou debiankaios: yes, ask your question :)
20:34 debiankaios hi
20:35 debiankaios er yes
20:35 debiankaios my wiki account requst got deleted but i got no e-mail
20:38 debiankaios Calinou, ↑
20:38 MTDiscord <savilli> why would you allow users to set their own regexps?
20:40 debiankaios what mean you with that, savilli?
20:43 Calinou debiankaios: can you send me a message (/query Calinou) with your desired wiki username?
20:43 Calinou ah, I see it
20:49 MTDiscord <savilli> doesn't "user supplied JS expression" mean users supply them?
20:50 MTDiscord <savilli> or do you mean a dos attack on a specific server regexp?
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21:01 debiankaios bye guys
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21:09 MTDiscord <luatic> erlehmann: lol I guess that's a newer version
21:09 MTDiscord <luatic> MT doesn't have it either
21:09 MTDiscord <luatic> what
21:09 MTDiscord <luatic> is MT missing a color?
21:10 erlehmann yes please add rebecca black to minetest hahaha
21:10 erlehmann ^^
21:10 MTDiscord <luatic> https://drafts.csswg.org/css-color/#changes-from-3
21:10 erlehmann yes minetest is apparently missing a color
21:10 MTDiscord <luatic> Looks like in CSS 3 it wasn't a thing
21:10 erlehmann if you copied from minetest
21:10 MTDiscord <luatic> sfan5 the docs should pinpoint a version instead of linking to the dev thing
21:10 MTDiscord <luatic> because that is updated
21:11 MTDiscord <luatic> while MT is not updated
21:11 erlehmann noooo, the docs said it was allowed!
21:11 MTDiscord <luatic> but it didn't work
21:11 erlehmann well, that's the joke
21:12 erlehmann i was kinda making fun of the “only if it is in the docs you can rely on it” line that is given so often when something is changed
21:12 erlehmann :P
21:13 sfan5 the docs of what? where?
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21:14 erlehmann luatic is wrong
21:14 erlehmann the docs say that colors are equivalent to CSS colors module level 4
21:14 erlehmann not level 3
21:14 erlehmann and have been saying that for a long time
21:15 MTDiscord <luatic> Because that's what is in fact implemented
21:15 independent56 Does minetest take mods and just stores it all in memory? If textures are stored as well, i'll go into panic. I can see a mod with loads of textures slowing servers.
21:15 independent56 I hope textures are taken as needed and stored in the client's memory.
21:15 MTDiscord <luatic> sfan5: the docs say https://github.com/minetest/minetest/blob/f2d1295fe646105f1b98b0c204f47f781336e211/doc/lua_api.txt which contradicts the state of the implementation, which is level 3
21:15 erlehmann independent56 do not worry about it
21:16 MTDiscord <luatic> the difference seems to basically be "rebeccablackpurple"
21:16 independent56 Why not?
21:16 MTDiscord <luatic> No, Minetest does not fully load mods into memory? Why would it?
21:16 erlehmann luatic well i do agree with you that the docs are wrong, i disagree that the fault was to “link to the dev version”
21:16 sfan5 okay but why are you pinging me on this
21:17 MTDiscord <luatic> Because either the docs or the code needs a fix ^^
21:17 MTDiscord <luatic> (and depending on what the fix will be, I might have to update modlib)
21:19 MTDiscord <luatic> independent56: There's media, and then there's code. I'm not quite sure whether the server loads all media into memory - it probably does - but that doesn't really matter as long as it stays in the megabyte range. Code size is negligible compared to that; compiled "chunks" will obviously reside in memory until Lua garbage collects them.  Now what about textures? Texture modifiers are indeed generated as needed (and then cached forever). Not
21:19 MTDiscord sure whether the same applies to base textures.
21:19 MTDiscord <luatic> (the latter is clientside)
21:19 independent56 Cool
21:20 independent56 I forgot textures aren't 100*100
21:20 sfan5 the server loads no media into memory
21:20 independent56 Thank god
21:20 erlehmann sfan5 luatic please do not update the code, but the docs, unless someone used this unwittingly
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21:21 erlehmann independent56 the server loads GIGACHUNKS into memory of ma
21:21 erlehmann map
21:21 erlehmann just use htop to see how intensive map is
21:21 MTDiscord <luatic> sfan5: so it reads from disk every time it has to send it?
21:21 MTDiscord <luatic> no caching?
21:21 sfan5 that's the kernels job
21:22 MTDiscord <luatic> erlehmann: I suggest we throw a warning if rebeccapurple is used lol
21:22 MTDiscord <luatic> (jk)
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