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<title>Developing with clipr</title>
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<h1 class="title toc-ignore">Developing with clipr</h1>
<h4 class="author">Matthew Lincoln</h4>
<h4 class="date">2022-02-18</h4>
<div id="calling-clipr-safely" class="section level2">
<h2>Calling clipr safely</h2>
<p>To check whether the system has been properly configured to allow access to the clipboard, you may run <code>clipr_available()</code> which will either return <code>TRUE</code> or <code>FALSE</code>. This will be particularly useful for Linux-based systems, where clipr’s functionality depends on the installation of additional software. If you wish to display system requirements and configuration messages to X11 and Wayland users, <code>dr_clipr()</code> will print these.</p>
</div>
<div id="interactive-non-interactive-use" class="section level2">
<h2>Interactive & non-interactive use</h2>
<p>If you use clipr in your own package, <strong>you must not try to call it in non-interactive sessions</strong>, as this goes against <a href="https://cran.r-project.org/web/packages/policies.html">CRAN repository policy</a>:</p>
<blockquote>
<p>Packages should not write in the user’s home filespace (including clipboards), nor anywhere else on the file system apart from the R session’s temporary directory (or during installation in the location pointed to by TMPDIR: and such usage should be cleaned up). Installing into the system’s R installation (e.g., scripts to its bin directory) is not allowed.</p>
<p>Limited exceptions may be allowed in interactive sessions if the package obtains confirmation from the user.</p>
</blockquote>
<p>For this reason, <code>write_clip()</code> will error by default in non-interactive use, which includes CRAN tests.</p>
<p>If you want to use <code>write_clip()</code> non-interactively, you may either set the environment variable <code>CLIPR_ALLOW=TRUE</code> or call <code>write_clip(..., allow_non_interactive = TRUE)</code>.</p>
</div>
<div id="testing-on-cran-and-ci" class="section level2">
<h2>Testing on CRAN and CI</h2>
<p>A few best practices will also help you responsibly test your clipr-using package on headless systems like CRAN or other testing infrastructure like Travis:</p>
<ol style="list-style-type: decimal">
<li>Examples that will try to use <code>read_clip()</code> or <code>write_clip()</code> ought to be wrapped in <code>\dontrun{}</code></li>
<li>Tests calling clipr should be conditionally skipped, based on the output of <code>clipr_available()</code>. This is necessary to pass CRAN checks, as otherwise <code>write_clip</code> will error out.</li>
<li>If you are using a headless system to check your package build on Linux, consult the <a href="https://github.com/mdlincoln/clipr/blob/main/.github/workflows/R-CMD-check.yaml">GitHub Actions workflow</a> for this package, which includes code for setting the <code>DISPLAY</code> and <code>CLIPR_ALLOW</code> environment variables, installing <code>xclip</code> and <code>xsel</code>, and running a pre-build script that will set up <code>xclip</code>/<code>xsel</code> to run headlessly under XVFB.</li>
</ol>
</div>
<div id="using-clipr-with-shiny" class="section level2">
<h2>Using clipr with Shiny</h2>
<p>clipr won’t do what you expect when you call it with Shiny.</p>
<p>clipr talks to the clipboard of the <em>system that is running R</em>. If you create a Shiny app and tell one of its functions to either read from or write to the clipboard, it can only access the clipboard of the server it is running on. R running on the <em>remote</em> server has no way to access the <em>local</em> clipboard belonging to your end user.</p>
<p>However, you can instruct the user’s <em>internet browser</em> to write to the user’s clipboard by using <a href="https://cran.r-project.org/package=rclipboard">rclipboard</a>.</p>
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