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I am using the LaTeX markdown package to insert quick notes in my document. I would like Emacs to switch to markdown mode inside the markdown environment so it for example won't automatically re-indent markdown nested lists.

Here is an excerpt of the latex file:

\chapter{Introduction} \label{chap:intro} \begin{markdown} Here's what'll be in this chapter: * thing 1 * thing 2 - aspect A - aspect B \end{markdown} In this chapter, we describe ...

Is there a way to change Emacs behavior without the need to invoking markdown mode manually each time I want to edit the inside of the environment?

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Reset to default
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You can use mmm-mode available at GNU Elpa.

There are examples how mmm-mode is to be configured.

In your case the following Elisp lines in your init file should work.

When you open a LaTeX file with markdown environments those are highlighted in grey. If you put point within those regions markdown-mode becomes active (e.g., indentation). When you write a new markdown environment per hand you should run Parse Block from the MMM menu. This is automagically done for you if you insert a markdown environment by C-c C-e (bound to LaTeX-environment).

(require 'mmm-auto) (setq mmm-global-mode 'maybe) (mmm-add-classes '((latex-markdown :submode markdown-mode :face mmm-declaration-submode-face :front "\\\\begin{markdown}" :delimiter-mode nil :back "\\\\end{markdown}"))) (mmm-add-mode-ext-class 'latex-mode nil 'latex-markdown) (defun my-LaTeX-parse-block-after-insert-environment (env _b _e) "Parse MMM block after inserting a markdown environment. `mmm-parse-block' is only called when ENV is \"markdown\"." (when (string-equal env "markdown") (mmm-parse-block 3))) (add-hook 'LaTeX-after-insert-env-hook #'my-LaTeX-parse-block-after-insert-environment)
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