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emacs html replace < > with &lt &gt

At times I like to post emails in my journal. The emails have < and > characters (usually > to indicate quoted text) and I need to quickly convert those to the ampersand versions of the characters.

This is in my .emacs file and is therefore available via
ESC x r e p l TAB < TAB

Start with point above the text you want to convert. It will not convert text above point, but everything below will be converted.

(fset 'replace-<->-with-lt-gt-codes
   [escape ?x ?r ?e ?p ?l ?a ?c ?e ?- ?s ?t ?r ?i ?n ?g return ?< return ?& ?l ?t ?\; return ?\C-x ?\C-x escape ?x ?r ?e ?p ?l ?a ?c ?e ?- ?s ?t ?r ?i ?n ?g return ?> return ?& ?g ?t ?\; return ?\C-x ?\C-x])