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POEmacs: How to switch mode after typing certain string?
 

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    <p>I am writing R Markdown (.Rmd) file with a lot of LaTeX contents. The major mode is Markdown-mode. But what I want is that: when I try to type some LaTeX commands between <code>$$</code>, I want to automatically turn on the LaTeX major mode, and after I end the LaTeX chunk with <code>$$</code> or <code>$</code>, it can turn off LaTeX major mode and turn on Markdown-mode again. </p> <p>The inline format for LaTeX is </p> <pre><code>$\alpha$ </code></pre> <p>The equation(displaymath) format for LaTeX is </p> <pre><code>$$ \alpha + \beta $$ </code></pre> <p>A similar example is when I was writing a <code>.Rnw</code> file, the major mode is LaTeX, but when I edit the R code chunk:</p> <pre><code>&lt;&lt;&gt;&gt;= y &lt;- 1000 @ </code></pre> <p>between <code>&lt;&lt;&gt;&gt;=</code> and <code>@</code>, it turns on the ESS mode. </p> <p>So can anyone help me to do the similar stuff in Markdown-LaTeX case? Thanks!</p> <hr> <p>Updates after Inaimathi's answer:</p> <p>Following <a href="http://www.emacswiki.org/emacs/MultipleModes#toc6" rel="nofollow">http://www.emacswiki.org/emacs/MultipleModes#toc6</a>, I need to modify the two-mode-mode.el</p> <pre><code>- (if (string= to-mode mode-name) + (if (string= to-mode major-mode) </code></pre> <p>and for emacs 24</p> <pre><code>- (make-local-hook 'post-command-hook) </code></pre> <p>Then, by Inaimathi, I put the following in my <code>.emacs</code>:</p> <pre><code>(require 'two-mode-mode) (setq default-mode (list "Markdown" 'markdown-mode) second-modes (list (list "LaTeX" "\\\[" "\\\]" 'latex-mode))) </code></pre> <p>Then the major mode switches between <code>\[</code> and <code>\]</code>. </p>
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