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Commands
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<a href="#create-a-command" title="Create a Command" class="md-nav__link">
Create a Command
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Run a Command
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View Commands
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<a href="#create-a-command" title="Create a Command" class="md-nav__link">
Create a Command
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Run a Command
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View Commands
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View a Command's Help Text
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<article class="md-content__inner md-typeset">
<h1 id="commands">Commands<a class="headerlink" href="#commands" title="Permanent link">¶</a></h1>
<p>Commands can be C# classes, lambda expressions, or CLI programs.
They can be queued, scheduled, or run from the command line.</p>
<h2 id="create-a-command">Create a Command<a class="headerlink" href="#create-a-command" title="Permanent link">¶</a></h2>
<p>The InEngine.Core package is required to create a C# class command.
Install it in a Visual Studio project.</p>
<p><strong>Package Manager</strong></p>
<div class="codehilite"><pre><span></span>Install-Package InEngine.Core
</pre></div>
<p><strong>Nuget CLI</strong></p>
<div class="codehilite"><pre><span></span>nuget install InEgine.Core
</pre></div>
<p><strong>.NET CLI</strong></p>
<div class="codehilite"><pre><span></span>dotnet add package InEngine.Core
</pre></div>
<p><strong>Paket CLI</strong></p>
<div class="codehilite"><pre><span></span>paket add InEngine.Core
</pre></div>
<p>To create a class command, extend the <strong>InEngine.Core.AbstractCommand</strong> class.
Minimally, the Run method should be overridden.</p>
<div class="codehilite"><pre><span></span><span class="k">using</span> <span class="nn">System</span><span class="p">;</span>
<span class="k">using</span> <span class="nn">InEngine.Core</span><span class="p">;</span>
<span class="k">namespace</span> <span class="nn">MyCommandPlugin</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">class</span> <span class="nc">MyCommand</span> <span class="p">:</span> <span class="n">AbstractCommand</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">override</span> <span class="k">void</span> <span class="nf">Run</span><span class="p">()</span>
<span class="p">{</span>
<span class="n">Console</span><span class="p">.</span><span class="n">WriteLine</span><span class="p">(</span><span class="s">"Hello, world!"</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
<h2 id="run-a-command">Run a Command<a class="headerlink" href="#run-a-command" title="Permanent link">¶</a></h2>
<p>Create a class that extends <strong>InEngine.Core.AbstractPlugin</strong> in the same assembly as the command class.
Add a VerbOptions attribute, from the <strong>CommandLine</strong> namespace, that defines the name of the command. </p>
<p>This class registers a command in the MyPlugin assembly called "mycommand":</p>
<div class="codehilite"><pre><span></span><span class="k">using</span> <span class="nn">CommandLine</span><span class="p">;</span>
<span class="k">using</span> <span class="nn">CommandLine.Text</span><span class="p">;</span>
<span class="k">using</span> <span class="nn">InEngine.Core</span><span class="p">;</span>
<span class="k">namespace</span> <span class="nn">MyCommandPlugin</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">class</span> <span class="nc">MyPlugin</span> <span class="p">:</span> <span class="n">AbstractPlugin</span>
<span class="p">{</span>
<span class="na"> [VerbOption("mycommand", HelpText="My example command.")]</span>
<span class="k">public</span> <span class="n">MyCommand</span> <span class="n">MyCommand</span> <span class="p">{</span> <span class="k">get</span><span class="p">;</span> <span class="k">set</span><span class="p">;</span> <span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
<p>Download the InEngine binary distribution, from the <a href="https://github.com/InEngine-NET/InEngine.NET/releases">GitHub Releases</a> page, that matches the version of the InEngine.Core package you included.</p>
<p>Copy your project's DLLs into the Plugins subdirectory included in the binary distribution.
Add your plugin to the "Plugins" list in <a href="../configuration">appsettings.config</a> at the root of the binary distribution.</p>
<p>Run your command:</p>
<div class="codehilite"><pre><span></span>inengine.exe mycommand
</pre></div>
<h3 id="writing-output">Writing Output<a class="headerlink" href="#writing-output" title="Permanent link">¶</a></h3>
<p>The <strong>InEngine.Core.AbstractCommand</strong> class provides some helper functions to output text to the console, for example:</p>
<div class="codehilite"><pre><span></span><span class="k">public</span> <span class="k">override</span> <span class="k">void</span> <span class="nf">Run</span><span class="p">()</span>
<span class="p">{</span>
<span class="n">Line</span><span class="p">(</span><span class="s">"Display some information"</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
<p>All of these commands append a newline to the end of the specified text:</p>
<div class="codehilite"><pre><span></span><span class="n">Line</span><span class="p">(</span><span class="s">"This is some text"</span><span class="p">);</span> <span class="c1">// Text color is white</span>
<span class="n">Info</span><span class="p">(</span><span class="s">"Something good happened"</span><span class="p">);</span> <span class="c1">// Text color is green</span>
<span class="n">Warning</span><span class="p">(</span><span class="s">"Something not so good happened"</span><span class="p">);</span> <span class="c1">// Text color is yellow</span>
<span class="n">Error</span><span class="p">(</span><span class="s">"Something bad happened"</span><span class="p">);</span> <span class="c1">// Text color is red</span>
</pre></div>
<p>These commands are similar, but they do not append a newline:</p>
<div class="codehilite"><pre><span></span><span class="n">Text</span><span class="p">(</span><span class="s">"This is some text"</span><span class="p">);</span> <span class="c1">// Text color is white</span>
<span class="n">InfoText</span><span class="p">(</span><span class="s">"Something good happened"</span><span class="p">);</span> <span class="c1">// Text color is green</span>
<span class="n">WarningText</span><span class="p">(</span><span class="s">"Something not so good happened"</span><span class="p">);</span> <span class="c1">// Text color is yellow</span>
<span class="n">ErrorText</span><span class="p">(</span><span class="s">"Something bad happened"</span><span class="p">);</span> <span class="c1">// Text color is red</span>
</pre></div>
<p>You can also display newlines:</p>
<div class="codehilite"><pre><span></span><span class="n">Newline</span><span class="p">();</span> <span class="c1">// 1 newline</span>
<span class="n">Newline</span><span class="p">(</span><span class="m">5</span><span class="p">);</span> <span class="c1">// 5 newlines</span>
<span class="n">Newline</span><span class="p">(</span><span class="m">10</span><span class="p">);</span> <span class="c1">// 10 newlines</span>
</pre></div>
<p>The methods can be chained together:</p>
<div class="codehilite"><pre><span></span><span class="n">InfoText</span><span class="p">(</span><span class="s">"You have this many things: "</span><span class="p">)</span>
<span class="p">.</span><span class="n">Line</span><span class="p">(</span><span class="s">"23"</span><span class="p">)</span>
<span class="p">.</span><span class="n">NewLine</span><span class="p">(</span><span class="m">2</span><span class="p">)</span>
<span class="p">.</span><span class="n">InfoText</span><span class="p">(</span><span class="s">"You have this many other things: "</span><span class="p">)</span>
<span class="p">.</span><span class="n">Line</span><span class="p">(</span><span class="s">"34"</span><span class="p">)</span>
<span class="p">.</span><span class="n">NewLine</span><span class="p">(</span><span class="m">2</span><span class="p">);</span>
</pre></div>
<h3 id="progress-bar">Progress Bar<a class="headerlink" href="#progress-bar" title="Permanent link">¶</a></h3>
<p>The <strong>InEngine.Core.AbstractCommand</strong> class provides a ProgressBar property to show command progress in a terminal.
This is how it is used:</p>
<div class="codehilite"><pre><span></span><span class="k">public</span> <span class="k">override</span> <span class="k">void</span> <span class="nf">Run</span><span class="p">()</span>
<span class="p">{</span>
<span class="c1">// Define the ticks (aka steps) for the command...</span>
<span class="kt">var</span> <span class="n">maxTicks</span> <span class="p">=</span> <span class="m">100000</span><span class="p">;</span>
<span class="n">SetProgressBarMaxTicks</span><span class="p">(</span><span class="n">maxTicks</span><span class="p">);</span>
<span class="c1">// Do some work...</span>
<span class="k">for</span> <span class="p">(</span><span class="kt">var</span> <span class="n">i</span> <span class="p">=</span> <span class="m">0</span><span class="p">;</span> <span class="n">i</span> <span class="p"><=</span> <span class="n">maxTicks</span><span class="p">;</span><span class="n">i</span><span class="p">++)</span>
<span class="p">{</span>
<span class="c1">// Update the command's progress</span>
<span class="n">UpdateProgress</span><span class="p">(</span><span class="n">i</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
<h3 id="running-non-net-commands">Running non-.NET Commands<a class="headerlink" href="#running-non-net-commands" title="Permanent link">¶</a></h3>
<p>It is not necessary to create C# classes to utilize InEngine.NET.
Arbitrary external programs can be run, with an optional argument list, by leveraging the InEngine.Core plugin's <strong>exec</strong> command.</p>
<p>For example, create a python script called <strong>helloworld.py</strong>, make it executable, and add this to it:</p>
<div class="codehilite"><pre><span></span><span class="ch">#!/usr/bin/env python</span>
<span class="k">print</span> <span class="s1">'Hello, world!'</span>
</pre></div>
<p>Whitelist the helloworld.py script in the <a href="../configuration">appsettings.json</a> file:</p>
<div class="codehilite"><pre><span></span><span class="p">{</span>
<span class="nt">"InEngine"</span><span class="p">:</span> <span class="p">{</span>
<span class="err">//</span> <span class="err">...</span>
<span class="nt">"ExecWhitelist"</span><span class="p">:</span> <span class="p">{</span>
<span class="nt">"helloworld"</span><span class="p">:</span> <span class="s2">"/path/to/helloworld.py"</span>
<span class="p">}</span>
<span class="err">//</span> <span class="err">...</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
<p>Now execute it with the <strong>exec</strong> command:</p>
<div class="codehilite"><pre><span></span>inengine <span class="nb">exec</span> --executable<span class="o">=</span><span class="s2">"helloworld"</span>
</pre></div>
<p>If an external executable requires arguments, use the <strong>--args</strong> argument:</p>
<div class="codehilite"><pre><span></span>inengine <span class="nb">exec</span> --executable<span class="o">=</span><span class="s2">"foo"</span> --args<span class="o">=</span><span class="s2">"--version"</span>
</pre></div>
<h2 id="view-commands">View Commands<a class="headerlink" href="#view-commands" title="Permanent link">¶</a></h2>
<p>Run inengine.exe with no arguments to see a list of commands:</p>
<div class="codehilite"><pre><span></span>inengine.exe
</pre></div>
<p><img alt="InEngine Command List" src="../images/commands.png" /></p>
<div class="admonition note">
<p class="admonition-title">InEngine.Core is a Plugin</p>
<p>The <strong>InEngine.Core</strong> library is itself a plugin that contains queueing, scheduling, and other commands. </p>
</div>
<h2 id="view-a-commands-help-text">View a Command's Help Text<a class="headerlink" href="#view-a-commands-help-text" title="Permanent link">¶</a></h2>
<p>Run the command with the -h or --help arguments to see help text.</p>
<p>This command prints the publish command's help text, from the core plugin:</p>
<div class="codehilite"><pre><span></span>inengine.exe queue:publish -h
</pre></div>
<p>The <strong>InEngine.Core</strong> plugin's command to clear the InEngine.NET queues produces this help message. </p>
<div class="codehilite"><pre><span></span>InEngine 3.x
Copyright © 2017 Ethan Hann
--plugin Required. The name of a command plugin file, e.g.
InEngine.Core
--command A command name, e.g. echo
--class A command class, e.g.
InEngine.Core.Commands.AlwaysSucceed. Takes precedence
over --command if both are specified.
--args An optional list of arguments to publish with the
command.
--secondary (Default: False) Publish the command to the secondary
queue.
</pre></div>
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