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Best way to get buffer changes in a program?

From: Thorsten Jolitz
Subject: Best way to get buffer changes in a program?
Date: Tue, 18 Mar 2014 01:02:58 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Hi List, 

there are many ways to track and visualize changes in Emacs (see

However, I would like to get non-interactively a list of lines (or
positions) in the buffer that changed after the last command - how to I
do that? Is is somehow possible to determine in a program that calls
other functions that insert text which new lines have been inserted (when
a buffer increased in size after a command was executed)?

Thanks in advance for any hints.


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