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How do I find the elisp code for the major mode in use in the current buffer?

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The variable major-mode will be set to a symbol describing the mode.

If the mode was written anytime in recent history, that symbol will be a function that activates the mode.

So you can simply "find" the major mode's code.

(find-function major-mode)

Or interactively, run M-x describe-mode and click the link to the source file.

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