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<h1 id="commands">Commands</h1>
<p>Commands are a big part of the Discord bot usage. A command can be defined as an order you give to a bot. Basic examples of commands are:
<code>!help</code> or <code>!info</code>, most bots have either of the two.
In the case of these examples, when you send <code>!help</code> or <code>!info</code> the bot will reply with a help or info message.</p>
<h2 id="basic-commands">Basic commands</h2>
<p>Creating commands in Disco is really easy because of the <a href="https://b1naryth1ef.github.io/disco/bot_tutorial/building_block_plugins.html" target="_blank">Plugins</a> that are a core fundamential of Disco. For more info on them, read back in the <a href="https://b1naryth1ef.github.io/disco/bot_tutorial/building_block_plugins.html" target="_blank">Plugins</a> section of this tutorial. Creating a basic command is done as follows:
First, create a Plugin class:</p>
<pre class="language-"><code class="lang-py"><span class="token keyword">class</span> <span class="token class-name">myPlugin</span><span class="token punctuation">(</span>Plugin<span class="token punctuation">)</span><span class="token punctuation">:</span>
</code></pre>
<p>Now, we can add a command to it. The command will be named ping, and it will simply reply with <code>pong!</code></p>
<pre class="language-"><code class="lang-py">@Plugin<span class="token punctuation">.</span>command<span class="token punctuation">(</span><span class="token string">&apos;ping&apos;</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">on_ping_command</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> event<span class="token punctuation">)</span><span class="token punctuation">:</span>
event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span><span class="token string">&apos;Pong!&apos;</span><span class="token punctuation">)</span>
</code></pre>
<p>And there we go! Our very first command!</p>
<h2 id="command-arguments">Command arguments</h2>
<p>Next, lets go on to some more advanced commands. Wye&apos;ll create an echo command that will respond with whatever we put in to it.</p>
<pre class="language-"><code class="lang-py">@Plugin<span class="token punctuation">.</span>command<span class="token punctuation">(</span><span class="token string">&apos;echo&apos;</span><span class="token punctuation">,</span> <span class="token string">&apos;&lt;content:str...&gt;&apos;</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">on_echo_command</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> event<span class="token punctuation">,</span> content<span class="token punctuation">)</span><span class="token punctuation">:</span>
event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span>content<span class="token punctuation">)</span>
</code></pre>
<p>What we did here, was add an argument to our command. The argument we created here, content, is required. This means the command won&apos;t work if you don&apos;t pass in data for the <code>content</code> argument.
You can also add optional arguments to a command. Instead of surrounding the name and type in angle brackets, you&apos;d surround them in square brackets like this: <code>[content:str...]</code>
Keep in mind that arguments that are optional might not be there. You&apos;ll have to create some checks so that your program doesn&apos;t crash on unexpected null values.</p>
<h2 id="command-groups">Command groups</h2>
<p>Now that we have 2 basic commands and we know to create basic commands and add some arguments to it. Let&apos;s create a more advanced command utilizing what we just learned.
The command will take 2 numbers (integers) and simply adds them together. It will work like this: <code>!math add 1 4</code> and it would return 5. Instead of passing <code>&apos;math add&apos;</code> as the command name, we&apos;ll be using command groups here.
Using command groups you can easily group commands together and create sub commands. Now, here comes our math command:</p>
<pre class="language-"><code class="lang-py">@Plugin<span class="token punctuation">.</span>command<span class="token punctuation">(</span><span class="token string">&apos;add&apos;</span><span class="token punctuation">,</span> <span class="token string">&apos;&lt;a:int&gt; &lt;b:int&gt;&apos;</span><span class="token punctuation">,</span> group<span class="token operator">=</span><span class="token string">&apos;math&apos;</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">on_add_command</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> event<span class="token punctuation">,</span> a<span class="token punctuation">,</span> b<span class="token punctuation">)</span><span class="token punctuation">:</span>
event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span><span class="token string">&apos;{}&apos;</span><span class="token punctuation">.</span>format<span class="token punctuation">(</span>a<span class="token operator">+</span>b<span class="token punctuation">)</span><span class="token punctuation">)</span>
</code></pre>
<p>Here, we added multiple arguments to our command. Namely, number a and number b, that we add together and return back. Of course, you can do loads more fun things with the Disco command handler.</p>
<h2 id="optional-arguments">Optional arguments</h2>
<p>Lets create a tag system, that can either store a tag if you&apos;d use it like this: <code>!tag name value</code> or retrieve a tag if you&apos;d use it like this: <code>!tag name</code></p>
<p>We&apos;ll need 2 arguments. A name argument that&apos;s required, and an optional value argument. Inside the command we&apos;ll check if a <code>value</code> is provided. If there is, we&apos;ll store the tag. Otherwise, we&apos;ll try to retrieve the previously set value for that tag and return it.
For the sake of this example, we&apos;ll asume that the <code>tags</code> dict gets stored somewhere so it doesn&apos;t get removed after a restart.</p>
<pre class="language-"><code class="lang-py">tags <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
@Plugin<span class="token punctuation">.</span>command<span class="token punctuation">(</span><span class="token string">&apos;tag&apos;</span><span class="token punctuation">,</span> <span class="token string">&apos;&lt;name:str&gt; [value:str...]&apos;</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">on_tag_command</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> event<span class="token punctuation">,</span> name<span class="token punctuation">,</span> value<span class="token operator">=</span>None<span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token keyword">if</span> value<span class="token punctuation">:</span>
tags<span class="token punctuation">[</span>name<span class="token punctuation">]</span> <span class="token operator">=</span> value
event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span><span class="token string">&apos;:ok_hand: created tag `{}`&apos;</span><span class="token punctuation">.</span>format<span class="token punctuation">(</span>name<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">else</span><span class="token punctuation">:</span>
<span class="token keyword">if</span> name <span class="token keyword">in</span> tags<span class="token punctuation">.</span>keys<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token keyword">return</span> event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span>tags<span class="token punctuation">[</span>name<span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token keyword">else</span><span class="token punctuation">:</span>
<span class="token keyword">return</span> event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span><span class="token string">&apos;Unknown tag: `{}`&apos;</span><span class="token punctuation">.</span>format<span class="token punctuation">(</span>name<span class="token punctuation">)</span><span class="token punctuation">)</span>
</code></pre>
<h2 id="argumentparser">ArgumentParser</h2>
<p>A different way of adding arguments to a command is by using <code>argparse.ArgumentParser</code>. With <code>argparser</code> it&apos;s easier to create more complicated commands with many options or flags.
Let&apos;s put this into practice by recreating our math add command, but using <code>argparser</code>. More info on <code>argparser</code> and the <code>add_argument()</code> method can be found <a href="https://docs.python.org/2/library/argparse.html#the-add-argument-method" target="_blank">here</a></p>
<pre class="language-"><code class="lang-py">@Plugin<span class="token punctuation">.</span>command<span class="token punctuation">(</span><span class="token string">&apos;add&apos;</span><span class="token punctuation">,</span> parser<span class="token operator">=</span><span class="token boolean">True</span><span class="token punctuation">,</span> group<span class="token operator">=</span><span class="token string">&apos;math&apos;</span><span class="token punctuation">)</span>
@Plugin<span class="token punctuation">.</span>parser<span class="token punctuation">.</span>add_argument<span class="token punctuation">(</span><span class="token string">&apos;a&apos;</span><span class="token punctuation">,</span> type<span class="token operator">=</span>int<span class="token punctuation">)</span>
@Plugin<span class="token punctuation">.</span>parser<span class="token punctuation">.</span>add_argument<span class="token punctuation">(</span><span class="token string">&apos;b&apos;</span><span class="token punctuation">,</span> type<span class="token operator">=</span>int<span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">on_add_command</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> event<span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">:</span>
event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span><span class="token string">&apos;{}&apos;</span><span class="token punctuation">.</span>format<span class="token punctuation">(</span>args<span class="token punctuation">.</span>a <span class="token operator">+</span> args<span class="token punctuation">.</span>b<span class="token punctuation">)</span>
</code></pre>
<p>These are all the commands we created in this tutorial:</p>
<pre class="language-"><code class="lang-py"><span class="token keyword">class</span> <span class="token class-name">myPlugin</span><span class="token punctuation">(</span>Plugin<span class="token punctuation">)</span><span class="token punctuation">:</span>
@Plugin<span class="token punctuation">.</span>command<span class="token punctuation">(</span><span class="token string">&apos;ping&apos;</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">on_ping_command</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> event<span class="token punctuation">)</span><span class="token punctuation">:</span>
event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span><span class="token string">&apos;Pong!&apos;</span><span class="token punctuation">)</span>
@Plugin<span class="token punctuation">.</span>command<span class="token punctuation">(</span><span class="token string">&apos;echo&apos;</span><span class="token punctuation">,</span> <span class="token string">&apos;&lt;content:str...&gt;&apos;</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">on_echo_command</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> event<span class="token punctuation">,</span> content<span class="token punctuation">)</span><span class="token punctuation">:</span>
event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span>content<span class="token punctuation">)</span>
@Plugin<span class="token punctuation">.</span>command<span class="token punctuation">(</span><span class="token string">&apos;add&apos;</span><span class="token punctuation">,</span> <span class="token string">&apos;&lt;a:int&gt; &lt;b:int&gt;&apos;</span><span class="token punctuation">,</span> group<span class="token operator">=</span><span class="token string">&apos;math&apos;</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">on_add_command</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> event<span class="token punctuation">,</span> a<span class="token punctuation">,</span> b<span class="token punctuation">)</span><span class="token punctuation">:</span>
event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span><span class="token string">&apos;{}&apos;</span><span class="token punctuation">.</span>format<span class="token punctuation">(</span>a<span class="token operator">+</span>b<span class="token punctuation">)</span><span class="token punctuation">)</span>
tags <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
@Plugin<span class="token punctuation">.</span>command<span class="token punctuation">(</span><span class="token string">&apos;tag&apos;</span><span class="token punctuation">,</span> <span class="token string">&apos;&lt;name:str&gt; [value:str...]&apos;</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">on_tag_command</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> event<span class="token punctuation">,</span> name<span class="token punctuation">,</span> value<span class="token operator">=</span>None<span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token keyword">if</span> value<span class="token punctuation">:</span>
tags<span class="token punctuation">[</span>name<span class="token punctuation">]</span> <span class="token operator">=</span> value
event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span><span class="token string">&apos;:ok_hand: created tag `{}`&apos;</span><span class="token punctuation">.</span>format<span class="token punctuation">(</span>name<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">else</span><span class="token punctuation">:</span>
<span class="token keyword">if</span> name <span class="token keyword">in</span> tags<span class="token punctuation">.</span>keys<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token keyword">return</span> event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span>tags<span class="token punctuation">[</span>name<span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token keyword">else</span><span class="token punctuation">:</span>
<span class="token keyword">return</span> event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span><span class="token string">&apos;Unknown tag: `{}`&apos;</span><span class="token punctuation">.</span>format<span class="token punctuation">(</span>name<span class="token punctuation">)</span><span class="token punctuation">)</span>
@Plugin<span class="token punctuation">.</span>command<span class="token punctuation">(</span><span class="token string">&apos;add&apos;</span><span class="token punctuation">,</span> parser<span class="token operator">=</span><span class="token boolean">True</span><span class="token punctuation">,</span> group<span class="token operator">=</span><span class="token string">&apos;math&apos;</span><span class="token punctuation">)</span>
@Plugin<span class="token punctuation">.</span>parser<span class="token punctuation">.</span>add_argument<span class="token punctuation">(</span><span class="token string">&apos;a&apos;</span><span class="token punctuation">,</span> type<span class="token operator">=</span>int<span class="token punctuation">)</span>
@Plugin<span class="token punctuation">.</span>parser<span class="token punctuation">.</span>add_argument<span class="token punctuation">(</span><span class="token string">&apos;b&apos;</span><span class="token punctuation">,</span> type<span class="token operator">=</span>int<span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">on_add_command</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> event<span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">:</span>
event<span class="token punctuation">.</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">(</span><span class="token string">&apos;{}&apos;</span><span class="token punctuation">.</span>format<span class="token punctuation">(</span>args<span class="token punctuation">.</span>a <span class="token operator">+</span> args<span class="token punctuation">.</span>b<span class="token punctuation">)</span>
</code></pre>
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