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    <p>Well, let's start with <a href="https://stackoverflow.com/questions/756666/match-regular-expression-as-keyword-in-define-generic-mode/756927#756927">this answer</a>, which uses <a href="http://www.gnu.org/software/emacs/elisp/html_node/Generic-Modes.html" rel="nofollow noreferrer"><code>define-generic-mode</code></a>.</p> <p>Flesh it out with some comment characters like: <code>/* */</code>, some keywords: <code>hello</code> <code>hi</code> etc., re-use the face from the original answer, a file extension <code>.hello</code>, and a function call to do further customization.</p> <p>There's the additional line to get autoloading working, but you have to <a href="http://www.gnu.org/software/emacs/elisp/html_node/Autoload.html" rel="nofollow noreferrer">generate the loaddefs.el</a> file. That's more advanced than hello world.</p> <p>And, you end up with this:</p> <pre><code>(make-face 'my-date-face) (set-face-attribute 'my-date-face nil :underline t) (set-face-attribute 'my-date-face nil :family "times") (set-face-attribute 'my-date-face nil :slant 'normal) (set-face-attribute 'my-date-face nil :height '340) ;;;###autoload (define-generic-mode hello-world '(("/*" . "*/")) ; comment characters '("hello" "hi" "howdy" "greetings" "hola") ; keywords '(("\\([0-9]+/[0-9]+/[0-9]+\\)" (1 'my-date-face))) ; font lock '("\\.hello$") ; auto-mode-alist '(hello-world-special-setup) ; function-list "An example major mode. We have comments, keywords, a special face for dates, and recognize .hello files.") (defun hello-world-special-setup () "Some custom setup stuff done here by mode writer." (message "You've just enabled the most amazing mode ever.")) </code></pre>
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    1. POA 'hello world' example for a major mode in Emacs?
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