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| author | Tycho Bickerstaff <work.tycho@gmail.com> | 2013-12-22 14:19:27 +0100 |
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| committer | Tycho Bickerstaff <work.tycho@gmail.com> | 2013-12-22 14:19:27 +0100 |
| commit | 94ca07cfbfe0016d70963c055c87fe14f8622a4d (patch) | |
| tree | 28dc91dc948287f802d9628a2ea715e1d4e0be49 /MCServer/Plugins/APIDump/Writing-a-MCServer-plugin.html | |
| parent | Chunk is now warnings clean (diff) | |
| parent | Update GETTING-STARTED.md (diff) | |
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diff --git a/MCServer/Plugins/APIDump/Writing-a-MCServer-plugin.html b/MCServer/Plugins/APIDump/Writing-a-MCServer-plugin.html new file mode 100644 index 000000000..50e39d533 --- /dev/null +++ b/MCServer/Plugins/APIDump/Writing-a-MCServer-plugin.html @@ -0,0 +1,263 @@ +<!DOCTYPE html> + +<html> + <head> + <title>MCS Plugin Tutorial</title> + <link rel="stylesheet" type="text/css" href="main.css" /> + <link rel="stylesheet" type="text/css" href="prettify.css" /> + <script src="prettify.js"></script> + <script src="lang-lua.js"></script> + <meta charset="UTF-8"> + </head> + <body> + <div id="content"> + <h1>Writing a MCServer plugin</h1> + <p> + This article will explain how to write a basic plugin. It details basic requirements + for a plugin, explains how to register a hook and bind a command, and gives plugin + standards details. + </p> + <p> + Let us begin. In order to begin development, we must firstly obtain a compiled copy + of MCServer, and make sure that the Core plugin is within the Plugins folder, and activated. + Core handles much of the MCServer end-user experience and is a necessary component of + plugin development, as necessary plugin components depend on sone of its functions. + </p> + <p> + Next, we must obtain a copy of CoreMessaging.lua. This can be found + <a href="https://raw.github.com/mc-server/MCServer/master/MCServer/Plugins/MagicCarpet/coremessaging.lua">here.</a> + This is used to provide messaging support that is compliant with MCServer standards. + </p> + <h2>Creating the basic template</h2> + <p> + Plugins are written in Lua. Therefore, create a new Lua file. You can create as many files as you wish, with + any filename - MCServer bungs them all together at runtime, however, let us create a file called main.lua for now. + Format it like so: + </p> + <pre class="prettyprint lang-lua"> +local PLUGIN + +function Initialize(Plugin) + Plugin:SetName("DerpyPlugin") + Plugin:SetVersion(1) + + PLUGIN = Plugin + + -- Hooks + + local PluginManager = cPluginManager:Get() + -- Command bindings + + LOG("Initialised " .. Plugin:GetName() .. " v." .. Plugin:GetVersion()) + return true +end + +function OnDisable() + LOG(PLUGIN:GetName() .. " is shutting down...") +end + </pre> + <p> + Now for an explanation of the basics. + <ul> + <li><b>function Initialize</b> is called on plugin startup. It is the place where the plugin is set up.</li> + <li><b>Plugin:SetName</b> sets the name of the plugin.</li> + <li><b>Plugin:SetVersion</b> sets the revision number of the plugin. This must be an integer.</li> + <li><b>LOG</b> logs to console a message, in this case, it prints that the plugin was initialised.</li> + <li>The <b>PLUGIN</b> variable just stores this plugin's object, so GetName() can be called in OnDisable (as no Plugin parameter is passed there, contrary to Initialize).</li> + <li><b>function OnDisable</b> is called when the plugin is disabled, commonly when the server is shutting down. Perform cleanup and logging here.</li> + </ul> + Be sure to return true for this function, else MCS thinks you plugin had failed to initialise and prints a stacktrace with an error message. + </p> + + <h2>Registering hooks</h2> + <p> + Hooks are things that MCServer calls when an internal event occurs. For example, a hook is fired when a player places a block, moves, + logs on, eats, and many other things. For a full list, see <a href="index.html">the API documentation</a>. + </p> + <p> + A hook can be either informative or overridable. In any case, returning false will not trigger a response, but returning true will cancel + the hook and prevent it from being propagated further to other plugins. An overridable hook simply means that there is visible behaviour + to a hook's cancellation, such as a chest being prevented from being opened. There are some exceptions to this where only changing the value the + hook passes has an effect, and not the actual return value, an example being the HOOK_KILLING hook. See the API docs for details. + </p> + <p> + To register a hook, insert the following code template into the "-- Hooks" area in the previous code example. + </p> + <pre class="prettyprint lang-lua"> +cPluginManager.AddHook(cPluginManager.HOOK_NAME_HERE, FunctionNameToBeCalled) + </pre> + <p> + What does this code do? + <ul> + <li><b>cPluginManager.AddHook</b> registers the hook. The hook name is the second parameter. See the previous API documentation link for a list of all hooks.</li> + </ul> + What about the third parameter, you ask? Well, it is the name of the function that MCServer calls when the hook fires. It is in this + function that you should handle or cancel the hook. + </p> + <p> + So in total, this is a working representation of what we have so far covered. + </p> + <pre class="prettyprint lang-lua"> +function Initialize(Plugin) + Plugin:SetName("DerpyPlugin") + Plugin:SetVersion(1) + + cPluginManager.AddHook(cPluginManager.HOOK_PLAYER_MOVING, OnPlayerMoving) + + local PluginManager = cPluginManager:Get() + -- Command bindings + + LOG("Initialised " .. Plugin:GetName() .. " v." .. Plugin:GetVersion()) + return true +end + +function OnPlayerMoving(Player) -- See API docs for parameters of all hooks + return true -- Prohibit player movement, see docs for whether a hook is cancellable +end + </pre> + <p> + So, that code stops the player from moving. Not particularly helpful, but yes :P. Note that ALL documentation is available + on the main API docs page, so if ever in doubt, go there. + </p> + <h2>Binding a command</h2> + <h3>Format</h3> + <p> + So now we know how to hook into MCServer, how do we bind a command, such as /explode, for a player to type? That is more complicated. + We firstly add this template to the "-- Command bindings" section of the initial example: + </p> + <pre class="prettyprint lang-lua"> +-- ADD THIS IF COMMAND DOES NOT REQUIRE A PARAMETER (/explode) +PluginManager:BindCommand("/commandname", "permissionnode", FunctionToCall, " - Description of command") + +-- ADD THIS IF COMMAND DOES REQUIRE A PARAMETER (/explode Notch) +PluginManager:BindCommand("/commandname", "permissionnode", FunctionToCall, " ~ Description of command and parameter(s)") + </pre> + <p> + What does it do, and why are there two? + <ul> + <li><b>PluginManager:BindCommand</b> binds a command. It takes the command name (with a slash), the permission a player needs to execute the command, the function + to call when the command is executed, and a description of the command.</li> + </ul> + The command name is pretty self explanatory. The permission node is basically just a <b>string</b> that the player's group needs to have, so you can have anything in there, + though we recommend a style such as "derpyplugin.explode". The function to call is like the ones with Hooks, but with some fixed parameters which we will come on to later, + and the description is a description of the command which is shown when "/help" is typed. + </p> + <p> + So why are there two? Standards. A plugin that accepts a parameter MUST use a format for the description of " ~ Description of command and parms" + whereas a command that doesn't accept parameters MUST use " - Description of command" instead. Be sure to put a space before the tildes or dashes. + Additionally, try to keep the description brief and on one line on the client. + </p> + <h3>Parameters</h3> + <p> + What parameters are in the function MCServer calls when the command is executed? A 'Split' array and a 'Player' object. + </p> + <h4>The Split Array</h4> + <p> + The Split array is an array of all text submitted to the server, including the actual command. MCServer automatically splits the text into the array, + so plugin authors do not need to worry about that. An example of a Split array passed for the command, "/derp zubby explode" would be:<br /><br /> +    /derp (Split[1])<br /> +    zubby (Split[2])<br /> +    explode (Split[3])<br /> + <br /> +    The total amount of parameters passed were: 3 (#Split) + </p> + <h4>The Player Object and sending them messages</h4> + <p> + The Player object is basically a pointer to the player that has executed the command. You can do things with them, but most common is sending + a message. Again, see the API documentation for fuller details. But, you ask, how <i>do</i> we send a message to the client? + </p> + <p> + Remember that copy of CoreMessaging.lua that we downloaded earlier? Make sure that file is in your plugin folder, along with the main.lua file you are typing + your code in. Since MCS brings all the files together on JIT compile, we don't need to worry about requiring any files or such. Simply follow the below examples: + </p> + <pre class="prettyprint lang-lua"> +-- Format: §yellow[INFO] §white%text% (yellow [INFO], white text following it) +-- Use: Informational message, such as instructions for usage of a command +SendMessage(Player, "Usage: /explode [player]") + +-- Format: §green[INFO] §white%text% (green [INFO] etc.) +-- Use: Success message, like when a command executes successfully +SendMessageSuccess(Player, "Notch was blown up!") + +-- Format: §rose[INFO] §white%text% (rose coloured [INFO] etc.) +-- Use: Failure message, like when a command was entered correctly but failed to run, such as when the destination player wasn't found in a /tp command +SendMessageFailure(Player, "Player Salted was not found") + </pre> + <p> + Those are the basics. If you want to output text to the player for a reason other than the three listed above, and you want to colour the text, simply concatenate + "cChatColor.*colorhere*" with your desired text, concatenate being "..". See the API docs for more details of all colours, as well as details on logging to console with + LOG("Text"). + </p> + <h2>Final example and conclusion</h2> + <p> + So, a working example that checks the validity of a command, and blows up a player, and also refuses pickup collection to players with >100ms ping. + </p> + <pre class="prettyprint lang-lua"> +function Initialize(Plugin) + Plugin:SetName("DerpyPluginThatBlowsPeopleUp") + Plugin:SetVersion(9001) + + local PluginManager = cPluginManager:Get() + PluginManager:BindCommand("/explode", "derpyplugin.explode", Explode, " ~ Explode a player"); + + cPluginManager.AddHook(cPluginManager.HOOK_COLLECTING_PICKUP, OnCollectingPickup) + + LOG("Initialised " .. Plugin:GetName() .. " v." .. Plugin:GetVersion()) + return true +end + +function Explode(Split, Player) + if (#Split ~= 2) then + -- There was more or less than one argument (excluding the "/explode" bit) + -- Send the proper usage to the player and exit + SendMessage(Player, "Usage: /explode [playername]") + return true + end + + -- Create a callback ExplodePlayer with parameter Explodee, which MCS calls for every player on the server + local HasExploded = false + local ExplodePlayer = function(Explodee) + -- If the player we are currently at is the one we specified as the parameter + if (Explodee:GetName() == Split[2]) then + -- Create an explosion at the same position as they are; see <a href="cWorld.html">API docs</a> for further details of this function + Player:GetWorld():DoExplosionAt(Explodee:GetPosX(), Explodee:GetPosY(), Explodee:GetPosZ(), false, esPlugin) + SendMessageSuccess(Player, Split[2] .. " was successfully exploded") + HasExploded = true; + return true -- Signalize to MCS that we do not need to call this callback for any more players + end + end + + -- Tell MCS to loop through all players and call the callback above with the Player object it has found + cRoot:Get():FindAndDoWithPlayer(Split[2], ExplodePlayer) + + if not(HasExploded) then + -- We have not broken out so far, therefore, the player must not exist, send failure + SendMessageFailure(Player, Split[2] .. " was not found") + end + + return true +end + +function OnCollectingPickup(Player, Pickup) -- Again, see the API docs for parameters of all hooks. In this case, it is a Player and Pickup object + if (Player:GetClientHandle():GetPing() > 100) then -- Get ping of player, in milliseconds + return true -- Discriminate against high latency - you don't get drops :D + else + return false -- You do get the drops! Yay~ + end +end + </pre> + <p> + Make sure to read the comments for a description of what everything does. Also be sure to return true for all <b>command</b> handlers, unless you want MCS to print out an "Unknown command" message + when the command gets executed :P. Make sure to follow standards - use CoreMessaging.lua functions for messaging, dashes for no parameter commands and tildes for vice versa, + and finally, <a href="index.html">the API documentation</a> is your friend! + </p> + <p> + Happy coding ;) + </p> + + <script> + prettyPrint(); + </script> + </div> + </body> +</html> |