MMM Mode for Emacs
MMM Mode is a minor mode for Emacs that allows Multiple Major Modes
to coexist in one buffer. It is well-suited to editing:
* Preprocessed code, such as server-side Perl or PHP embedded in HTML
* Code generating code, such as HTML output by CGI scripts
* Literate programming: code interspersed with documentation, e.g. Noweb
MMM Mode has a standard GNU configure-driven installation. (See the
file INSTALL for generic instructions, most of which don't apply.)
To install in the standard locations, unpack the archive, `cd' to
the mmm-mode-X.X.X directory created, and run these commands:
Alternately, since currently MMM Mode is written in pure Emacs Lisp,
you could just copy all the *.el files in the distribution to a
directory in your `load-path', and optionally byte-compile them
manually (see the Emacs Manual). The configure installation also
installs the MMM Mode info manual in your site info directory, so if
you're installing manually, you might want to do that too.
If you're installing from the CVS version, you won't have the
configure script. If you have the automake/autoconf tools
installed, you can run the script `autogen.sh' first, and then
proceed as above. Otherwise, you'll have to copy the *.el files
manually as described above.
If you have more than one version of emacs installed and want to
use MMM in a version other than /usr/bin/emacs, you must set the
environment variable EMACS before running `configure', e.g.
If you want to use MMM in more than one version of emacs, you must
either have separate site-lisp directories (such as Debian does), or
load it from source every time; byte-compiled files are not portable
Once MMM Mode is installed, it has to be configured correctly. This
can be done in a site-start file or in user's initialization files;
usually the latter is preferable, except possibly for autoloads.
First the package needs to be loaded, with either
or instead, to save time during emacs startup,
Then you will probably want to set something like this:
(setq mmm-global-mode 'maybe)
(mmm-add-mode-ext-class 'html-mode "\\.php\\'" 'html-php)
The first line tells MMM Mode to load itself whenever you open an
appropriate file, and the second is an example which says to notice
PHP regions in html-mode files having a `.php' extension. Both
lines are necessary.
You will, of course, want to change and duplicate the second line
according to your needs. either of the first two parameters can be
`nil', meaning not to consider that criterion. For example, if all
your html files, regardless of extension, are Mason components, you
will want something like:
(mmm-add-mode-ext-class 'html-mode nil 'mason)
whereas if all your files with a `.nw' extension, regardless of
primary mode (some may be LaTeX, others HTML, say) are Noweb, you
(mmm-add-mode-ext-class nil "\\.nw\\'" 'noweb)
See the info file for more extensive documentation, and for other
For further information, see (in order) the accompanying info file,
the documentation strings of functions and variables, the comments
in the source code, and the source code itself.
The latest version of MMM Mode should always be available from
Bug reports and suggestions can be submitted at
through email to <email@example.com>.
MMM Mode is written and maintained by Michael Shulman,
<firstname.lastname@example.org>, and others; a list of some
contributors can be found on the Sourceforge project.
To subscribe to the MMM Mode mailing list, visit
The mailing list receives announcements of new releases and provides
a forum for discussion of bugs and features.
Thanks for using MMM Mode!