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<h1 class="title">Automation: Test drive make</h1>
<h4 class="author"><em>Shaun Jackman, Jenny Bryan</em></h4>
</div>
<div id="TOC">
<ul>
<li><a href="#create-a-temporary-rstudio-project">Create a temporary RStudio Project</a></li>
<li><a href="#disable-insert-spaces-for-tab">Disable “insert spaces for tab”</a></li>
<li><a href="#write-a-toy-makefile">Write a toy <code>Makefile</code></a></li>
<li><a href="#configure-this-rstudio-project-to-use-make">Configure this Rstudio Project to use <code>make</code></a></li>
<li><a href="#run-make-via-rstudio">Run <code>make</code> via RStudio</a></li>
<li><a href="#run-make-from-the-shell">Run <code>make</code> from the <a href="git09_shell.html">shell</a></a></li>
</ul>
</div>
<p>Before we use <code>make</code> for real work, we want to prove beyond a shadow of a doubt that it’s installed and findable from RStudio and/or the <a href="git09_shell.html">shell</a>.</p>
<div id="create-a-temporary-rstudio-project" class="section level3">
<h3>Create a temporary RStudio Project</h3>
<p>You can delete this project after this test drive, so don’t sweat too much about what you name it or where you put it.</p>
<ul>
<li>Create an RStudio project: <em>File > New Project</em></li>
<li>Create a new text file: <em>File > New File > Text File</em></li>
<li>We are about to write our first <code>Makefile</code>!</li>
</ul>
<p>But first …</p>
</div>
<div id="disable-insert-spaces-for-tab" class="section level3">
<h3>Disable “insert spaces for tab”</h3>
<p>Tabs are very meaningful in <code>Makefiles</code>, so it’s important to make sure your text editor is not “helpfully” but silently converting tabs to spaces.</p>
<p>Here’s how to disable this in RStudio.</p>
<ul>
<li>Global setting: <em>Tools > Global Options… > Code editing</em>. Make sure “insert spaces for tab” is <strong>unchecked</strong>.</li>
<li>Project-specific setting: <em>Tools > Project Options… > Code editing</em>. Make sure “insert spaces for tab” is <strong>unchecked</strong>.</li>
</ul>
<p>RStudio can reveal information about the whitespace in a file: <em>RStudio > Preferences… > Code editing > Show whitespace characters</em>. When in doubt, make darn sure your <code>Makefile</code> is indented with tabs and not spaces!</p>
</div>
<div id="write-a-toy-makefile" class="section level3">
<h3>Write a toy <code>Makefile</code></h3>
<p>Type or paste this into your new text file. Make sure the indentation before <code>@echo</code> is always a tab! Save as <code>Makefile</code>:</p>
<pre class="makefile"><code>all:
@echo Build all
clean:
@echo Clean all</code></pre>
</div>
<div id="configure-this-rstudio-project-to-use-make" class="section level3">
<h3>Configure this Rstudio Project to use <code>make</code></h3>
<p>Select <em>Build > Configure Build Tools > Build Tools > Project build tools > Makefile</em>.</p>
<p>This will make a new tab and buttons and menus available in RStudio, usually in the upper right-hand pane, similar to the Git stuff.</p>
</div>
<div id="run-make-via-rstudio" class="section level3">
<h3>Run <code>make</code> via RStudio</h3>
<p>Select <em>Build > Build All</em> (the hammer icon).</p>
<p>The result and any error messages should appear under the <em>Build</em> tab.</p>
<p>Hopefully you will see this:</p>
<pre class="sh"><code>Build all</code></pre>
<p>If you see something like this:</p>
<pre class="sh"><code>Makefile:2: *** missing separator. Stop.</code></pre>
<p>you probably have spaces instead of tabs as indentation. Fix that and try again.</p>
<p>RStudio offers these buttons or menu items to run things from your <code>Makefile</code>:</p>
<ul>
<li><em>Build All</em> runs <code>make all</code>, as we just saw</li>
<li><em>Clean All</em> runs <code>make clean</code></li>
<li><em>Clean and Rebuild</em> runs <code>make clean all</code></li>
</ul>
<p>For these menu items to work, your <code>Makefile</code> needs to have targets named <code>all</code> and <code>clean</code>. These non-file targets are called phony targets.</p>
<p>You should be able to select <em>Build > More > Clean All</em> and get this:</p>
<pre class="sh"><code>Clean all</code></pre>
<p>You should be able to select <em>Build > More > Clean and Rebuild</em> and get this:</p>
<pre class="sh"><code>Clean all
Build all</code></pre>
<p>This proves that <code>make</code> is installed and working from RStudio.</p>
</div>
<div id="run-make-from-the-shell" class="section level3">
<h3>Run <code>make</code> from the <a href="git09_shell.html">shell</a></h3>
<p>RStudio only provides access to a very limited bit of <code>make</code> – it’s even more limited than the RStudio Git client. In the long run, it’s important to be able to run <code>make</code> from the <a href="git09_shell.html">shell</a>.</p>
<ul>
<li>Select <em>Tools > Shell</em></li>
<li><p>Run</p>
<pre class="sh"><code>make clean
make all
make clean all</code></pre></li>
</ul>
<p>You should be seeing similar output as you saw in the Build tab of RStudio.</p>
<p>If you are not, are you getting the error message that’s characteristic of a “spaces instead of tabs” problem? Or does it look more like <code>make</code> or other commands aren’t being found? If the latter, go back to the <a href="automation02_windows.html">Windows installation page</a> or reach out to the course staff.</p>
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This work is licensed under the <a href="http://creativecommons.org/licenses/by-nc/3.0/">CC BY-NC 3.0 Creative Commons License</a>.
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