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<h1 class="title toc-ignore">Interfacing with RStudio in Visual
Mode</h1>



<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="fu">library</span>(rstudioapi)</span></code></pre></div>
<p>RStudio v1.4 includes a new <a href="https://rstudio.github.io/visual-markdown-editing/#/">visual
editing mode</a>, which provides a <a href="https://en.wikipedia.org/wiki/WYSIWYM">WYSIWYM</a>-style editing
interface for R Markdown documents. This vignette describes how
<code>rstudioapi</code> can be used to interface with the RStudio visual
mode editor.</p>
<p>Most of the pre-existing <code>rstudioapi</code> functions used for
interacting with a document
(e.g. <code>rstudioapi::getSourceEditorContext()</code>) consume and /
or produce objects which describe the position of the current selection
in terms of row + column offsets into the document. Unfortunately, this
abstraction does not neatly map into visual editing mode, as there is no
notion of a “global” cursor position – rather, a cursor might be placed
into a particular cell, and could have an offset somewhere into that
cell.</p>
<p>If you are an <a href="https://rstudio.github.io/rstudioaddins/">RStudio Addin</a>
author, then you may want to ensure your addins are visual-mode-aware,
so that they can function regardless of whether the user has enabled
visual mode. To that end, we’ve introduced a small set of functions,
which are more narrow in scope but can function in both source and
visual mode:</p>
<ul>
<li><code>rstudioapi::documentId()</code>: Retrieve the ID associated
with the document currently open and being edited in the RStudio
IDE.</li>
<li><code>rstudioapi::documentPath()</code>: Retrieve the path on disk
for a file currently open in the RStudio IDE.</li>
<li><code>rstudioapi::selectionGet()</code>: Get the contents of the
user’s selection.</li>
<li><code>rstudioapi::selectionSet()</code>: Set the contents of the
user’s selection.</li>
</ul>
<p>In addition, the <code>rstudioapi::insertText()</code> function will
function in both source and visual mode, as long as only the
<code>text</code> argument is supplied.</p>
<p>Using this, you can build addins that modify the user’s selected
text. For example, a function that uses <code>rstudioapi</code> to
reformat the user’s current selection might look like this:</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1" tabindex="-1"></a>reformat <span class="ot">&lt;-</span> <span class="cf">function</span>() {</span>
<span id="cb2-2"><a href="#cb2-2" tabindex="-1"></a>  id <span class="ot">&lt;-</span> rstudioapi<span class="sc">::</span><span class="fu">documentId</span>(<span class="at">allowConsole =</span> <span class="cn">TRUE</span>)</span>
<span id="cb2-3"><a href="#cb2-3" tabindex="-1"></a>  selection <span class="ot">&lt;-</span> rstudioapi<span class="sc">::</span><span class="fu">selectionGet</span>(<span class="at">id =</span> id)</span>
<span id="cb2-4"><a href="#cb2-4" tabindex="-1"></a>  formatted <span class="ot">&lt;-</span> styler<span class="sc">::</span><span class="fu">style_text</span>(<span class="at">text =</span> selection<span class="sc">$</span>value)</span>
<span id="cb2-5"><a href="#cb2-5" tabindex="-1"></a>  rstudioapi<span class="sc">::</span><span class="fu">selectionSet</span>(<span class="at">value =</span> formatted, <span class="at">id =</span> id)</span>
<span id="cb2-6"><a href="#cb2-6" tabindex="-1"></a>}</span></code></pre></div>



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