CODEWITHSUNDEEP
emacselisporg-mode
lawlist
lawlist

Reputation: 13457

How to use the same file extension for different major-modes

I use a custom version of org-mode called lawlist-org-mode -- every function and variable have the prefix lawlist- and the modified version has many custom features that are not available in the stock version. Occasionally, I like to use the stock org-mode version -- however, that requires manually modifying the auto-mode-alist and then restarting Emacs. This is necessary due to the function and variable org-agenda-files and the check that org-mode performs to verify that the proper major-mode is present. Is there an efficient method to modify this programmatically depending upon the function being called?

The stock org-mode needs this entry:

(add-to-list 'auto-mode-alist '("\\.todo\\'" . org-mode))

The custom version called lawlist-org-mode needs this entry:

(add-to-list 'auto-mode-alist '("\\.todo\\'" . lawlist-org-mode))

Examples:

Some Ideas:  The org-agenda-files are generally accessed by org-agenda functions using the following lines of code -- (org-agenda-files nil 'ifmode) . . . (while (setq file (pop files)). Perhaps modifying the function org-agenda-files would be an option?

Upvotes: 3

Views: 218

Answers (1)

Drew
Drew

Reputation: 30701

The FUNCTION part of an auto-mode-alist entry (i.e., the cdr) is just a function. It is called, in principle to set up a major mode. But it can do anything.

In particular, you could have an entry ("\\.todo\\'" . foo), where function foo conditionally calls either lawlist-org-mode or org-mode.

E.g, it could use lawlist-org-mode when the moon is full and org-mode otherwise. Or it could test a global variable, which you set when you want to switch from one to the other. And so on.

At least that's my reading of the auto-mode-alist doc string. I've never tried it.

Upvotes: 4

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