GNU ELPA - mmm-mode


Allow Multiple Major Modes in a buffer
mmm-mode-0.5.8.tar, 2020-May-25, 630 KiB
Dmitry Gutov <>
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To install this package, run in Emacs:

M-x package-install RET mmm-mode RET

Full description

                          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 Ruby, Perl or PHP embedded in HTML
  * Code generating code, such as HTML output by CGI scripts
  * Embedded code, such as Javascript in HTML
  * Literate programming: code interspersed with documentation, e.g. Noweb


  Use any of the following options:

  1. Users of package.el (a.k.a. ELPA) can easily install MMM Mode from
  the ELPA package repository at -- this is the
  preferred and best-supported installation mechanism.

  2. 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.

  3. 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:

    make maintainer-clean # optional step
    make install

  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.

    EMACS=/usr/bin/xemacs ./configure
    make install

  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
  between emacsen.


  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

    (require 'mmm-mode)

  or instead, to save time during emacs startup,

    (require 'mmm-auto)

  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
  will prefer

    (mmm-add-mode-ext-class nil "\\.nw\\'" 'noweb)

  See the info file for more extensive documentation, and for other
  configuration options.


  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, suggestions and questions can be submitted at

  Thanks for using MMM Mode!

Old versions

mmm-mode-0.5.7.tar2018-Jun-21 630 KiB
mmm-mode-0.5.6.tar2018-Mar-24 630 KiB
mmm-mode-0.5.5.tar2018-Mar-16 590 KiB


MMM Mode NEWS -- history of user-visible changes.  -*-outline-*-
Copyright (C) 2003, 2004, 2013-2015  Free Software Foundation, Inc.
See the file COPYING for copying conditions.

Please submit bug reports at
* Changes in MMM Mode 0.5.8
Support for Emacs 27.

Fixes for nesting submodes.
* Changes in MMM Mode 0.5.7
Fixes for mmm-indent-line-narrowed.
* Changes in MMM Mode 0.5.6
Emacs 25 compatibility fix when cl is not loaded.
* Changes in MMM Mode 0.5.5

Introduced mode transition hooks, like mmm-x-enter-hook and mmm-y-exit-hook.

New function mmm-indent-line-narrowed, to use as mmm-indent-line-function.

`cl-lib' is a new dependency, replacing `cl'. It comes bundled with
recent versions of Emacs, and for older ones it can be installed from

* Changes in MMM Mode 0.5.4

Fixes for indentation, SMIE support, and minor bugs.

* Changes in MMM Mode 0.5.2

Introduced `mmm-after-syntax-propertize-functions'. A primary major
mode can set it to adjust `syntax-table' text properties in submode

New file `mmm-defaults.el'. A user can simply require it and have
basic setup for ERB, EJS and PHP files (for the last one, `php-mode'
has to be installed separately).

`mmm-add-classes' is autoloaded.

`mmm-beginning-of-syntax' was removed.

Assorted highlighting and syntax detection improvements.

* Changes in MMM Mode 0.5.1

Some minor documentation updates and bugfixes.

* Changes in MMM Mode 0.5.0

** Compatibility with recent Emacsen

Updated to work with Emacs 23 and 24. Removed some compatibility code
for older versions. Added new local variables used in the latest js-mode
and cc-engine modes.

** New submode classes

New submode classes for ERB and EJS templates, both in mmm-erb.el. It
also includes a smart indentation algorithm, supporting them together
with script and style tag subregions in HTML code.

** Parsing when idle

Setting `mmm-parse-when-idle' will make MMM Mode re-parse modified
buffers when Emacs is idle. This can lead to visible pauses, though,
depending on the size of the buffer and the number of subregions.

** Support submode-specific syntax functions

Relevant for Emacs 24: we define a composite syntax-propertize-function
that delegates syntax recognition to respective submode functions.

For users, this means regular expressions in js-mode and string
interpolations and percent literals in ruby-mode.

** Indentation

More consistent indentation behavior, the default implementation
delegates to the submode at the end of the indentation.

The major mode can provide its own implementation by setting
mmm-indent-line-function, to handle specific mode combinations better.

* Changes in MMM Mode 0.4.8

** Delimiter Regions

The delimiters which mark off submode regions now have their own
overlays.  They can be highlighted if you so desire using appropriate
class arguments and/or the variable mmm-delimiter-face.  They are also
in an appropriate major mode, or non-mode as the case may be.

** Nested Submodes

Nested submodes are now vaguely supported.

** RPM Spec File

An RPM spec file, contributed by <>, is now
included for people who wish to build their own SRPM to install from.

** New Submode Classes

Many thanks to Joe Kelsey for writing a very intelligent class for
editing Noweb files, and to Alan Shutko for one for CWeb files.  We
also have a mode for SGML DTD definitions from Yann Dirson.

** Numerous bugfixes and small improvements

* Changes in MMM Mode 0.4.7

** Multiple Decoration Levels

You now have finer control over how colorful your submode regions are,
via `mmm-submode-decoration-level'.  Level 0 turns coloring off--no
messing around with faces required.  Level 1 (default) is the same as
in previous versions.  Level 2 colors regions according to function:
initialization, cleanup, output, declaration, comment, etc.

** Preferred Major Modes

The variable `mmm-major-mode-preferences' lets you tell MMM what modes
you prefer for different programming languages and they will be used
by all submode classes.

** New Submode Classes

New submode classes for JSP and ePerl are included.  A major bug in
the handling of embedded Java (and other C-type languages) was fixed,
so the JSP class should work consistently.

* MMM Mode 0.4.6 is a bug-fix release with one user-visible change:

** New Submode Class for RPM Spec Files

Contributed by Marcus Harnisch, the `rpm' submode class allows editing
appropriate parts of RPM spec files in shell-script mode.

* Changes in MMM Mode 0.4.5

** Font-Lock works again in XEmacs

The MMM code to handle font-locking broke in XEmacs several versions
back due to differences in the font-lock implementation between Emacs
and XEmacs.  It appears to be working once again.

** Here-Document submode class improved

Here-document names such as <<TEXT_EOF and <<END_PERL_CODE are now
correctly recognized, and `mmm-here-doc-mode-alist' allows you to
define your own mappings from here-document names to submodes.

* Changes in MMM Mode 0.4.4

** Tab Completion in `mmm-ify-by-class' (`C-c % C-c')

When interactively specifying a submode class, completion on all
defined public (not internal/private) submode classes is available.

** Submode classes can now be autoloaded

You don't need (require 'mmm-mason) or (require 'mmm-sample) in your
.emacs file any more; all the supplied submode classes that are not
automatically loaded are autoloaded from their files of definition.

** Here-Document submode class can now recognize any submode

As long as the name of the here-document is or begins with the name of
the appropriate submode, suitably mangled, such as <<HTML or
<<HTML_MODE or <<HTML_MODE_EOF, it should be correctly recognized.

** New File Variables submode class

Actually, this is an old submode class that now works (better than
before) with the new post-0.3.8 syntax for class definition.  It is a
good candidate for membership in `mmm-global-classes' if you use many
file-local variables, but is not there by default.

** New flags :include-{front,back}

If the keywords INCLUDE-FRONT or INCLUDE-BACK are set to non-nil
values in a submode class definition, the corresponding delimiter will
be included inside the submode region.

** New values for :{front,back}-offset

The keywords FRONT-OFFSET and BACK-OFFSET can now be function to call,
such as `beginning-of-line' or `end-of-line', or lists of values to
apply in sequence, such as (end-of-line 1).

** Search for next region now starts at end of previous one

...rather than at the end of the previous region's ending delimiter.
This allows matching regions ended only by the start of the next one.

* Changes in MMM Mode 0.4.3

** Syntax of Universal Class Changed

Instead of %[MODE]% ... %[/MODE]%, the universal class now uses
{%MODE%} ... {%/MODE%} which isn't quite as ugly and doesn't to my
knowledge conflict with any other syntax.

** Some Bugs under Emacs 19 and XEmacs Fixed

* Changes in MMM Mode 0.4.2

** Global Classes and `Universal' Class

The new variable `mmm-global-classes' is the inverse of `mmm-classes'
in that it contains submode classes which apply to all MMM Mode
buffers unless turned off manually with file-local variables.  By
default, it contains the class `universal', which defines the syntax
%[MODE]% ... %[/MODE]% to specify regions of any mode.  This allows,
for instance, example code embedded in an email to be both edited by
the sender and viewed by the receiver in an appropriate mode.

** New Embperl Submode Class

The new supplied submode class `embperl', which can be loaded with
(require 'mmm-sample), detects the Embperl syntax [+...+] (and so on)
for embedded Perl code.

* Changes in MMM Mode 0.4.1

** Font Lock Parsing Speed Improved

Extra regions were being parsed due to an error in finding the right
regions, slowing down the parsing considerably.  This has been fixed.

* Changes in MMM Mode 0.4.0

** Improved Local Variable Saving

Local variables can now be saved for only some major modes, as well as
both globally, per-buffer, or per-submode region.  This facility is
now used to save the font-lock cache state, possible improving the
font-lock support.  See the docs for `mmm-save-local-variables'.

** Get and Set Class Parameters

The functions `mmm-[get,set]-class-parameters' do just that.  The
latter modifies the definition of a submode class, affecting all
subsequent applications of that class.

** New Implementation for MMM Global Mode

The implementation of MMM Global Mode has been changed from the
"stack-walk" method to the "post-command-hook" method used by
global-font-lock-mode.  This is arguably cleaner, but more
importantly, waits until after all local variables and text are loaded
before trying to enabling MMM Mode.

* MMM Mode 0.3.10 is a bug-fix release with no user-visible changes

* MMM Mode 0.3.9 is a bug-fix release with no user-visible changes

* Changes in MMM Mode 0.3.8

** IMPORTANT: Default key bindings have changed.

The MMM Mode commands, including interactive MMM-ification and
re-parsing buffer regions, are now bound by default to key sequences
of the form `C-c % C-<letter>', rather than `C-c % <letter>' as
in previous versions.  Key sequences of the form `C-c % <letter>' are
now reserved for submode region insertion.  The old behavior can be
restored by setting the variable `mmm-use-old-command-keys' to a
non-nil value before MMM Mode is loaded--then insertion commands are
bound to `C-c % C-<letter>' sequences.

** New Global Mode added

MMM Global Mode can now turn MMM Mode on automatically in all buffers,
or only in buffers that have associated submode classes.  It replaces
the previous function `mmm-add-find-file-hook', which still works for
now.  A side effect of this change is that it is no longer necessary
to use `mmm-add-mode-ext-class': `mmm-mode-ext-classes-alist' can be
modified directly.

The hack used by MMM Global Mode to insinuate itself into all buffers
is different from, but vaguely similar to, the one used by FSF Emacs'
Global Font Lock Mode.  In order that future writers of global modes
don't have to reinvent the wheel, MMM Global Mode provides the hook
`mmm-major-mode-hook' which is run (in theory) whenever a major mode
starts up.  Perhaps in future this will be provided in a separate

** Automatic submode region insertion commands

Submode classes can now define skeletons for automatic insertion of
submode regions with delimiters.  For example, when using the Mason
class, the key sequence `C-c % %' will (by default) insert the text
`<% -!- %>' with point where indicated and submode region already
present.  These commands also wrap around words as described in the
documentation of `skeleton-insert'.

** Info Documentation File

MMM Mode now has an (admittedly incomplete) manual in Texinfo format.
It can be found in the files `' or `mmm.texinfo' in the

** Automatic Installation

MMM Mode now uses GNU automake/autoconf for ease of installation.  See
the files README and INSTALL for more information.

** Changed submode class specification format

This change affects only people who define their own submode classes.
The format for defining submode classes has changed; it now uses
keyword arguments for clarity and has a few more possible arguments,
including skeletons for submode region insertion.