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minetest/doc/menu_lua_api.txt

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Minetest Lua Mainmenu API Reference 5.6.0
=========================================
Introduction
-------------
The main menu is defined as a formspec by Lua in builtin/mainmenu/
Description of formspec language to show your menu is in lua_api.txt
Callbacks
---------
core.button_handler(fields): called when a button is pressed.
^ fields = {name1 = value1, name2 = value2, ...}
core.event_handler(event)
^ event: "MenuQuit", "KeyEnter", "ExitButton" or "EditBoxEnter"
Gamedata
--------
The "gamedata" table is read when calling core.start(). It should contain:
{
playername = <name>,
password = <password>,
address = <IP/adress>,
port = <port>,
selected_world = <index>, -- 0 for client mode
singleplayer = <true/false>,
}
Functions
---------
core.start()
core.close()
core.get_min_supp_proto()
^ returns the minimum supported network protocol version
core.get_max_supp_proto()
^ returns the maximum supported network protocol version
core.open_url(url)
^ opens the URL in a web browser, returns false on failure.
^ Must begin with http:// or https://
core.open_dir(path)
^ opens the path in the system file browser/explorer, returns false on failure.
^ Must be an existing directory.
core.get_version() (possible in async calls)
^ returns current core version
Filesystem
----------
core.get_builtin_path()
^ returns path to builtin root
core.create_dir(absolute_path) (possible in async calls)
^ absolute_path to directory to create (needs to be absolute)
^ returns true/false
core.delete_dir(absolute_path) (possible in async calls)
^ absolute_path to directory to delete (needs to be absolute)
^ returns true/false
core.copy_dir(source,destination,keep_soure) (possible in async calls)
^ source folder
^ destination folder
^ keep_source DEFAULT true --> if set to false source is deleted after copying
^ returns true/false
core.is_dir(path) (possible in async calls)
^ returns true if path is a valid dir
core.extract_zip(zipfile,destination) [unzip within path required]
^ zipfile to extract
^ destination folder to extract to
^ returns true/false
core.sound_play(spec, looped) -> handle
^ spec = SimpleSoundSpec (see lua-api.txt)
^ looped = bool
core.sound_stop(handle)
core.get_video_drivers()
^ get list of video drivers supported by engine (not all modes are guaranteed to work)
^ returns list of available video drivers' settings name and 'friendly' display name
^ e.g. { {name="opengl", friendly_name="OpenGL"}, {name="software", friendly_name="Software Renderer"} }
^ first element of returned list is guaranteed to be the NULL driver
core.get_mapgen_names([include_hidden=false]) -> table of map generator algorithms
registered in the core (possible in async calls)
core.get_cache_path() -> path of cache
core.get_temp_path([param]) (possible in async calls)
^ param=true: returns path to a temporary file
^ otherwise: returns path to the temporary folder
HTTP Requests
-------------
* core.download_file(url, target) (possible in async calls)
* url to download, and target to store to
* returns true/false
* `minetest.get_http_api()` (possible in async calls)
* returns `HTTPApiTable` containing http functions.
* The returned table contains the functions `fetch_sync`, `fetch_async` and
`fetch_async_get` described below.
* Function only exists if minetest server was built with cURL support.
* `HTTPApiTable.fetch_sync(HTTPRequest req)`: returns HTTPRequestResult
* Performs given request synchronously
* `HTTPApiTable.fetch_async(HTTPRequest req)`: returns handle
* Performs given request asynchronously and returns handle for
`HTTPApiTable.fetch_async_get`
* `HTTPApiTable.fetch_async_get(handle)`: returns HTTPRequestResult
* Return response data for given asynchronous HTTP request
### `HTTPRequest` definition
Used by `HTTPApiTable.fetch` and `HTTPApiTable.fetch_async`.
{
url = "http://example.org",
timeout = 10,
-- Timeout for connection in seconds. Default is 3 seconds.
post_data = "Raw POST request data string" OR {field1 = "data1", field2 = "data2"},
-- Optional, if specified a POST request with post_data is performed.
-- Accepts both a string and a table. If a table is specified, encodes
-- table as x-www-form-urlencoded key-value pairs.
-- If post_data is not specified, a GET request is performed instead.
user_agent = "ExampleUserAgent",
-- Optional, if specified replaces the default minetest user agent with
-- given string
extra_headers = { "Accept-Language: en-us", "Accept-Charset: utf-8" },
-- Optional, if specified adds additional headers to the HTTP request.
-- You must make sure that the header strings follow HTTP specification
-- ("Key: Value").
multipart = boolean
-- Optional, if true performs a multipart HTTP request.
-- Default is false.
}
### `HTTPRequestResult` definition
Passed to `HTTPApiTable.fetch` callback. Returned by
`HTTPApiTable.fetch_async_get`.
{
completed = true,
-- If true, the request has finished (either succeeded, failed or timed
-- out)
succeeded = true,
-- If true, the request was successful
timeout = false,
-- If true, the request timed out
code = 200,
-- HTTP status code
data = "response"
}
Formspec
--------
core.update_formspec(formspec)
core.get_table_index(tablename) -> index
^ can also handle textlists
core.formspec_escape(string) -> string
^ escapes characters [ ] \ , ; that can not be used in formspecs
core.explode_table_event(string) -> table
^ returns e.g. {type="CHG", row=1, column=2}
^ type: "INV" (no row selected), "CHG" (selected) or "DCL" (double-click)
core.explode_textlist_event(string) -> table
^ returns e.g. {type="CHG", index=1}
^ type: "INV" (no row selected), "CHG" (selected) or "DCL" (double-click)
core.set_formspec_prepend(formspec)
^ string to be added to every mainmenu formspec, to be used for theming.
GUI
---
core.set_background(type, texturepath,[tile],[minsize])
^ type: "background", "overlay", "header" or "footer"
^ tile: tile the image instead of scaling (background only)
^ minsize: minimum tile size, images are scaled to at least this size prior
^ doing tiling (background only)
core.set_clouds(<true/false>)
core.set_topleft_text(text)
core.show_keys_menu()
core.show_path_select_dialog(formname, caption, is_file_select)
^ shows a path select dialog
^ formname is base name of dialog response returned in fields
^ -if dialog was accepted "_accepted"
^ will be added to fieldname containing the path
^ -if dialog was canceled "_cancelled"
^ will be added to fieldname value is set to formname itself
^ if `is_file_select` is `true`, a file and not a folder will be selected
^ returns nil or selected file/folder
core.get_screen_info()
^ returns {
density = <screen density 0.75,1.0,2.0,3.0 ... (dpi)>,
display_width = <width of display>,
display_height = <height of display>,
window_width = <current window width>,
window_height = <current window height>,
render_info = <active render information>
}
Content and Packages
--------------------
Content - an installed mod, modpack, game, or texture pack (txt)
Package - content which is downloadable from the content db, may or may not be installed.
* core.get_user_path() (possible in async calls)
* returns path to global user data,
the directory that contains user-provided mods, worlds, games, and texture packs.
* core.get_modpath() (possible in async calls)
* returns path to global modpath in the user path, where mods can be installed
* core.get_modpaths() (possible in async calls)
* returns table of virtual path to global modpaths, where mods have been installed
The difference with "core.get_modpath" is that no mods should be installed in these
directories by Minetest -- they might be read-only.
Ex:
```
{
mods = "/home/user/.minetest/mods",
share = "/usr/share/minetest/mods",
-- Custom dirs can be specified by the MINETEST_MOD_DIR env variable
["/path/to/custom/dir"] = "/path/to/custom/dir",
}
```
* core.get_clientmodpath() (possible in async calls)
* returns path to global client-side modpath
* core.get_gamepath() (possible in async calls)
* returns path to global gamepath
* core.get_texturepath() (possible in async calls)
* returns path to default textures
* core.get_game(index)
* `name` in return value is deprecated, use `title` instead.
* returns:
{
id = <id>,
path = <full path to game>,
gamemods_path = <path>,
title = <title of game>,
menuicon_path = <full path to menuicon>,
author = "author",
DEPRECATED:
addon_mods_paths = {[1] = <path>,},
}
* core.get_games() -> table of all games in upper format (possible in async calls)
* core.get_content_info(path)
* returns
{
name = "technical_id",
type = "mod" or "modpack" or "game" or "txp",
title = "Human readable title",
description = "description",
author = "author",
path = "path/to/content",
depends = {"mod", "names"}, -- mods only
optional_depends = {"mod", "names"}, -- mods only
}
Logging
-------
core.debug(line) (possible in async calls)
^ Always printed to stderr and logfile (print() is redirected here)
core.log(line) (possible in async calls)
core.log(loglevel, line) (possible in async calls)
^ loglevel one of "error", "action", "info", "verbose"
Settings
--------
core.settings:set(name, value)
core.settings:get(name) -> string or nil (possible in async calls)
core.settings:set_bool(name, value)
core.settings:get_bool(name) -> bool or nil (possible in async calls)
core.settings:save() -> nil, save all settings to config file
For a complete list of methods of the Settings object see
[lua_api.txt](https://github.com/minetest/minetest/blob/master/doc/lua_api.txt)
Worlds
------
core.get_worlds() -> list of worlds (possible in async calls)
^ returns {
[1] = {
path = <full path to world>,
name = <name of world>,
gameid = <gameid of world>,
},
}
core.create_world(worldname, gameid)
core.delete_world(index)
Helpers
-------
core.get_us_time()
^ returns time with microsecond precision
core.gettext(string) -> string
^ look up the translation of a string in the gettext message catalog
fgettext_ne(string, ...)
^ call core.gettext(string), replace "$1"..."$9" with the given
^ extra arguments and return the result
fgettext(string, ...) -> string
^ same as fgettext_ne(), but calls core.formspec_escape before returning result
core.parse_json(string[, nullvalue]) -> something (possible in async calls)
^ see core.parse_json (lua_api.txt)
dump(obj, dumped={})
^ Return object serialized as a string
string:split(separator)
^ eg. string:split("a,b", ",") == {"a","b"}
string:trim()
^ eg. string.trim("\n \t\tfoo bar\t ") == "foo bar"
core.is_yes(arg) (possible in async calls)
^ returns whether arg can be interpreted as yes
minetest.encode_base64(string) (possible in async calls)
^ Encodes a string in base64.
minetest.decode_base64(string) (possible in async calls)
^ Decodes a string encoded in base64.
Async
-----
core.handle_async(async_job,parameters,finished)
^ execute a function asynchronously
^ async_job is a function receiving one parameter and returning one parameter
^ parameters parameter table passed to async_job
^ finished function to be called once async_job has finished
^ the result of async_job is passed to this function
Limitations of Async operations
-No access to global lua variables, don't even try
-Limited set of available functions
e.g. No access to functions modifying menu like core.start,core.close,
core.show_path_select_dialog
Background music
----------------
The main menu supports background music.
It looks for a `main_menu` sound in `$USER_PATH/sounds`. The same naming
conventions as for normal sounds apply.
This means the player can add a custom sound.
It will be played in the main menu (gain = 1.0), looped.
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