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I'm using the icalendar export built into org-mode to export my agenda to an ical file. I also use org-bbdb to insert birthdays (anniversaries) into the agenda. Using the variable org-icalendar-include-bbdb-anniversaries, these anniversaries are exported to the ical file, which is great.

The problem is that the format of these birthday entries is not customizable. I traced back the formatting of the org-bbdb entries to the ical entries to the function org-bbdb-format-vevent, defined in org-bbdb.el. Can I overwrite or modify this function without patching org-bbdb.el? If so, what's the recommended way to do that?

  • For rewriting a function, it is generally sufficient to require the library that contains the original function and then (below that require statement) you can have a new function with the same function name as the old one that does whatever you want. You could also create a new function and then use defalias -- the same procedure regarding having a require statement beforehand is generally used. And you could also use advice as BrianZ suggested in his answer below -- if the feature can be corrected by adding something before or after the original function, but not in-between. – lawlist Jan 18 '16 at 17:47
  • See Preferred method of overriding an emacs lisp function?: stackoverflow.com/a/15725437/2112489 – lawlist Jan 18 '16 at 21:06
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I'm not sure about the formatting in bbdb specifically, but it sounds like you are looking to "advise" org-bbdb-format-vevent. Check out the manual which has a section on this topic.

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