EVOLUTION-MANAGER
Edit File: document-manipulation.html
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} code > span.ot { color: #007020; } code > span.al { color: #ff0000; font-weight: bold; } code > span.fu { color: #900; font-weight: bold; } code > span.er { color: #a61717; background-color: #e3d2d2; } </style> </head> <body> <h1 class="title toc-ignore">Document Manipulation</h1> <div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1"></a>knitr<span class="op">::</span>opts_chunk<span class="op">$</span><span class="kw">set</span>(<span class="dt">eval =</span> <span class="ot">FALSE</span>)</span></code></pre></div> <p>The <code>rstudioapi</code> package provides a small family of functions that can be used to interact with documents open in an RStudio session. For example, the following code could be used to insert a ‘last modified’ comment at the start of a document:</p> <div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1"></a><span class="co"># construct the text to be inserted</span></span> <span id="cb2-2"><a href="#cb2-2"></a>fmt <-<span class="st"> "# This document was last modified on %s.</span><span class="ch">\n</span><span class="st">"</span></span> <span id="cb2-3"><a href="#cb2-3"></a>text <-<span class="st"> </span><span class="kw">sprintf</span>(fmt, <span class="kw">Sys.Date</span>())</span> <span id="cb2-4"><a href="#cb2-4"></a></span> <span id="cb2-5"><a href="#cb2-5"></a><span class="co"># specify a range where this text should be inserted; here,</span></span> <span id="cb2-6"><a href="#cb2-6"></a><span class="co"># we use the first line; that is, the 'range' between the start</span></span> <span id="cb2-7"><a href="#cb2-7"></a><span class="co"># of the first row, and the start of the second row</span></span> <span id="cb2-8"><a href="#cb2-8"></a>range <-<span class="st"> </span>rstudioapi<span class="op">::</span><span class="kw">document_range</span>(<span class="kw">c</span>(<span class="dv">1</span>, <span class="dv">0</span>), <span class="kw">c</span>(<span class="dv">2</span>, <span class="dv">0</span>))</span> <span id="cb2-9"><a href="#cb2-9"></a>rstudioapi<span class="op">::</span><span class="kw">insertText</span>(range, text)</span></code></pre></div> <p>By default, these APIs target the editor instance either currently focused by the user, or when no such editor is currently focused, the last focused editor. If you need to target a specific editor instance (for example, you want to write code that inserts text into the console), you can use <code>getConsoleEditorContext()</code> to get the <code>id</code> for the console editor:</p> <div class="sourceCode" id="cb3"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1"></a><span class="co"># get console editor id</span></span> <span id="cb3-2"><a href="#cb3-2"></a>context <-<span class="st"> </span>rstudioapi<span class="op">::</span><span class="kw">getConsoleEditorContext</span>()</span> <span id="cb3-3"><a href="#cb3-3"></a>id <-<span class="st"> </span>context<span class="op">$</span>id</span> <span id="cb3-4"><a href="#cb3-4"></a></span> <span id="cb3-5"><a href="#cb3-5"></a><span class="co"># send some R code to the console</span></span> <span id="cb3-6"><a href="#cb3-6"></a>rstudioapi<span class="op">::</span><span class="kw">insertText</span>(<span class="dt">text =</span> <span class="st">"print(1 + 1)"</span>, <span class="dt">id =</span> id)</span> <span id="cb3-7"><a href="#cb3-7"></a></span> <span id="cb3-8"><a href="#cb3-8"></a><span class="co"># see also: `getActiveEditorContext()`, `getSourceEditorContext()`</span></span></code></pre></div> <p>You can also modify the cursor position through the use of the <code>setCursorPosition()</code> and <code>setSelectionRanges()</code> APIs.</p> <div class="sourceCode" id="cb4"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb4-1"><a href="#cb4-1"></a><span class="co"># put the cursor at the end of the document -- note that here,</span></span> <span id="cb4-2"><a href="#cb4-2"></a><span class="co"># `Inf` is automatically truncated to the actual length of the</span></span> <span id="cb4-3"><a href="#cb4-3"></a><span class="co"># document</span></span> <span id="cb4-4"><a href="#cb4-4"></a>rstudioapi<span class="op">::</span><span class="kw">setCursorPosition</span>(<span class="ot">Inf</span>)</span> <span id="cb4-5"><a href="#cb4-5"></a></span> <span id="cb4-6"><a href="#cb4-6"></a><span class="co"># select the first 10 even lines in the document</span></span> <span id="cb4-7"><a href="#cb4-7"></a>ranges <-<span class="st"> </span><span class="kw">lapply</span>(<span class="kw">seq</span>(<span class="dv">2</span>, <span class="dt">by =</span> <span class="dv">2</span>, <span class="dt">length.out =</span> <span class="dv">10</span>), <span class="cf">function</span>(start) {</span> <span id="cb4-8"><a href="#cb4-8"></a> rstudioapi<span class="op">::</span><span class="kw">document_range</span>(</span> <span id="cb4-9"><a href="#cb4-9"></a> <span class="kw">c</span>(start, <span class="dv">0</span>),</span> <span id="cb4-10"><a href="#cb4-10"></a> <span class="kw">c</span>(start, <span class="ot">Inf</span>)</span> <span id="cb4-11"><a href="#cb4-11"></a> )</span> <span id="cb4-12"><a href="#cb4-12"></a>})</span> <span id="cb4-13"><a href="#cb4-13"></a>rstudioapi<span class="op">::</span><span class="kw">setSelectionRanges</span>(ranges)</span></code></pre></div> <p>See the <code>?"rstudio-documents"</code> help page for more details.</p> <!-- code folding --> <!-- dynamically load mathjax for compatibility with self-contained --> <script> (function () { var script = document.createElement("script"); script.type = "text/javascript"; script.src = "https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"; document.getElementsByTagName("head")[0].appendChild(script); })(); </script> </body> </html>