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In Emacs I’m editing some source code, and I hit <tab>. Emacs indents the line to n spaces. I’d like to change the amount that indents for that kind of line. How do I figure out what rule emacs applied to indent that line by n spaces?
I want to change n, but I need to figure out which of the many indentation-related variables Emacs just used.
If you’re using a mode based on cc-mode (e.g. c-mode, c++-mode, java-mode, etc.), you can hit C-c C-s and it’ll tell you what syntactic category the line is. If you want to change it, hit C-c C-o and you’ll be guided through the process. Check out the cc-mode docs on customization for more details: https://www.gnu.org/s/emacs/manual/html_node/ccmode/Customizing-Indentation.html