Homepage: https://github.com/joewreschnig/auto-minor-mode
Author: Joe Wreschnig
Updated:
Enable minor modes by file name and contents
This package lets you enable minor modes based on file name and
contents. To find the right modes, it checks filenames against
patterns in ‘auto-minor-mode-alist’ and file contents against
‘auto-minor-mode-magic-alist’. These work like the built-in Emacs
variables ‘auto-mode-alist’ and ‘magic-mode-alist’.
Unlike major modes, all matching minor modes are enabled, not only
the first match.
A reason you might want to use it:
(add-to-list 'auto-minor-mode-alist '("-theme\\.el\\'" . rainbow-mode))
There’s intentionally no equivalent of ‘interpreter-mode-alist’.
Interpreters should determine the major mode. Relevant minor
modes can then be enabled by major mode hooks.
Minor modes are set whenever ‘set-auto-mode’, the built-in function
responsible for handling automatic major modes, is called.
If you also use ‘use-package’, two new keywords are added, ‘:minor’
and ‘:magic-minor’, which register entries in these alists. You
must load (and not defer) ‘auto-minor-mode’ before using these
keywords for other packages.