Browse Source

Imported Upstream version 1.0.3

tags/upstream/1.0.3^0
Nicolas Bourdaud 9 years ago
commit
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Havoc Pennington <hp@redhat.com>

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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991

Copyright (C) 1989, 1991 Free Software Foundation, Inc.
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
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<one line to give the program's name and a brief idea of what it does.>
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Also add information on how to contact you by electronic and paper mail.

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Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.

<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice

This General Public License does not permit incorporating your program into
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consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.

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Intro...

Window managers have a few ways in which they are significantly different
from other applications. This file, combined with the code overview in
doc/code-overview.txt, should hopefully provide a series of relatively
quick pointers (hopefully only a few minutes each) to some of the places
one can look to orient themselves and get started. Some of this will be
general to window managers on X, much will be specific to Metacity, and
there's probably some information that's common to programs in general but
is nonetheless useful.

Overview
Administrative issues
Minimal Building/Testing Environment
Relevant standards and X properties
Debugging and testing
Debugging logs
Adding information to the log
Valgrind
Testing Utilities
Technical gotchas to keep in mind
Other important reading
Extra reading
Ideas for tasks to work on


Administrative issues
Don't commit substantive code in here without asking hp@redhat.com.
Adding translations, no-brainer typo fixes, etc. is fine.

The code could use cleanup in a lot of places, feel free to do so.

See http://developer.gnome.org/dotplan/for_maintainers.html for
information on how to make a release. The only difference from those
instructions is that the minor version number of a Metacity release
should always be a number from the Fibonacci sequence.

Minimal Building/Testing Environment
You do not need to _install_ a development version of Metacity to
build, run and test it; you can run it from some temporary
directory. Also, you do not need to build all of Gnome in order to
build a development version of Metacity -- odds are, you may be able
to build metacity from CVS without building any other modules.

As long as you have gtk+ >= 2.10 and GConf with your distro (gtk+ >=
2.6 if you manually revert the change from bug 348633), you should
be able to install your distro's development packages
(e.g. gtk2-devel, GConf2-devel, startup-notification-devel on
Fedora; also, remember to install the gnome-common package which is
needed for building cvs versions of Gnome modules like Metacity) as
well as the standard development tools (gcc, autoconf, automake,
pkg-config, intltool, and libtool) and be ready to build and test
Metacity. Steps to do so:

$ svn checkout http://svn.gnome.org/svn/metacity/trunk metacity
$ cd metacity
$ ./autogen.sh --prefix /usr
$ make
$ ./src/metacity --replace

Again, note that you do not need to run 'make install'.

Relevant standards and X properties
There are two documents that describe some basics about how window
managers should behave: the ICCCM (Inter-Client Communication Conventions
Manual) and EWMH (Extended Window Manager Hints). You can find these at
the following locations:
ICCCM - http://tronche.com/gui/x/icccm/
EWMH - :pserver:anoncvs@pdx.freedesktop.org:/cvs
The ICCCM is usually available in RPM or DEB format as well. There is
actually an online version of the EWMH, but it is almost always woefully
out of date. Just get it from cvs with these commands (the backslash
means include the stuff from the next line):
cvs -d :pserver:anoncvs@cvs.freedesktop.org:/cvs/icccm-extensions login
cvs -d :pserver:anoncvs@cvs.freedesktop.org:/cvs/icccm-extensions \
checkout wm-spec

DO NOT GO AND READ THOSE THINGS. THEY ARE REALLY, REALLY BORING.

If you do, you'll probably end up catching up on your sleep instead of
hacking on Metacity. ;-) Instead, just look at the table of contents and
glance at a page or two to get an idea of what's in there. Then only
refer to it if you see something weird in the code and you don't know
what it is but has some funny looking name like you see in one of those
two documents.

You can refer to the COMPLIANCE file for additional information on these
specifications and Metacity's compliance therewith.

One of the major things those documents cover that are useful to learn
about immediately are X properties. The right way to learn about those,
though, is through hand on experimentation with the xprop command (and
then look up things you find from xprop in those two manuals if you're
curious enough). First, try running
xprop
in a terminal and click on one of the windows on your screen. That gives
you the x properties for that window. Look through them and get a basic
idea of what's there for kicks. Note that you can get rid of some of the
verboseness by grepping out the _NET_WM_ICON stuff, i.e.
xprop | grep -v _NET_WM_ICON
Next, try running
xprop -root
in a terminal. There's all the properties of the root window (which you
can think of as the "main" Xserver window). You can also manually
specify individual windows that you want the properties of with
xprop -id <id>
if you know the id of the window in question. You can get the id of a
given window by either running xwininfo, e.g.
xwininfo | grep "Window id" | cut -f 4 -d ' '
or by looking at the _NET_CLIENT_STACKING property of the root
window. Finally, it can also be useful to add "-spy" (without the
quotes) to the xprop command to get it to continually monitor that
window and report any changes to you.

Debugging information
Trying to run a window manager under a typical debugger, such as gdb,
unfortunately just doesn't work very well. So, we have to resort to
other methods.

Debugging logs

First, note that you can start a new version of metacity to replace the
existing one by running
metacity --replace
(which also comes in handy in the form "./src/metacity --replace" when
trying to quickly test a small change while hacking on metacity without
doing a full "make install", though I'm going off topic...) This will
allow you to see any warnings printed at the terminal. Sometimes it's
useful to have these directed to a logfile instead, which you can do by
running
METACITY_USE_LOGFILE=1 metacity --replace
The logfile it uses will be printed in the terminal. Sometimes, it's
useful to get more information than just warnings. You can set
METACITY_VERBOSE to do that, like so:
METACITY_VERBOSE=1 METACITY_USE_LOGFILE=1 metacity --replace
(note that METACITY_VERBOSE=1 can be problematic without
METACITY_USE_LOGFILE=1; avoid it unless running in from something that
won't be managed by the new Metacity--see bug 305091 for more details).
There are also other flags, such as METACITY_DEBUG, most of which I
haven't tried and don't know what they do. Go to the source code
directory and run
grep "METACITY_" * | grep getenv
to find out what the other ones are.

Adding information to the log

Since we can't single step with a debugger, we often have to fall back to
the primitive method of getting information we want to know: adding
"print" statements. Metacity has a fairly structured way to do this,
using the functions meta_warning, meta_topic, and meta_verbose. All
three have the same basic format as printf, except that meta_topic also
takes a leading enumeration parameter to specify the type of message
being shown (makes it easier for grepping in a verbose log). You'll find
tons of examples in the source code if you need them; just do a quick
grep or look in most any file. Note that meta_topic and meta_verbose
messages only appear if verbosity is turned on. I tend to frequently add
temporary meta_warning statements (or switch meta_topic or meta_verbose
ones to meta_warning ones) and then undo the changes once I've learned
the info that I needed.

There is also a meta_print_backtrace (which again is only active if
verbosity is turned on) that can also be useful if you want to learn how
a particular line of code gets called. And, of course, there's always
g_assert if you want to make sure some section isn't executed (or isn't
executed under certain conditions).

Valgrind

Valgrind is awesome for finding memory leaks or corruption and
uninitialized variables. But I also tend to use it in a non-traditional
way as a partial substitute for a normal debugger: it can provide me with
a stack trace of where metacity is crashing if I made a change that
caused it to do so, which is one of the major uses of debuggers. (And,
what makes it cooler than a debugger is that there will also often be
warnings pinpointing the cause of the crash from either some kind of
simple memory corruption or an uninitialized variable). Sometimes, when
I merely want to know what is calling a particular function I'll just
throw in an "int i; printf("%d\n", i);" just because valgrind will give
me a full stacktrace whenever it sees that uninitialized variable being
used (yes, I could use meta_print_backtrace, but that means I have to
turn verbosity on).

To run metacity under valgrind, use options typical for any Gnome
program, such as
valgrind --log-file=metacity.log --tool=memcheck --num-callers=48 \
--leak-check=yes --leak-resolution=high --show-reachable=yes \
./src/metacity --replace
where, again, the backslashes mean to join all the stuff on the following
line with the previous one.

However, there is a downside. Things run a little bit slowly, and it
appears that you'll need about 1.5GB of ram, which unfortunately prevents
most people from trying this.

Testing Utilities

src/run-metacity.sh
The script src/run-metacity.sh is useful to hack on the window manager.
It runs metacity in an Xnest. e.g.:
CLIENTS=3 ./run-metacity.sh
or
DEBUG=memprof ./run-metacity.sh
or
DEBUG_TEST=1 ./run-metacity-sh
or whatever.

metacity-message
The tool metacity-message can be used as follows:
metacity-message reload-theme
metacity-message restart
metacity-message enable-keybindings
metacity-message disable-keybindings
The first of these is useful for testing themes, the second is just
another way (besides the --restart flag to metacity itself) of
restarting metacity, and the third is useful for testing Metacity when
running it under an Xnest (typically, the Metacity under the Xnest
wouldn't get keybinding notifications--making keyboard navigation not
work--but if you disable the keybindings for the global Metacity then
the Metacity under the Xnest can then get those keybinding notifications).

metacity-window-demo
metacity-window-demo is good for trying behavior of various kinds
of window without launching a full desktop.

Technical gotchas to keep in mind
Files that include gdk.h or gtk.h are not supposed to include
display.h or window.h or other core files. Files in the core
(display.[hc], window.[hc]) are not supposed to include gdk.h or
gtk.h. Reasons:

"Basically you don't want GDK most of the time. It adds
abstractions that cause problems, because they aren't designed to
be used in a WM where we do weird stuff (display grabs, and just
being the WM). At best GDK adds inefficiency, at worst it breaks
things in weird ways where you have to be a GDK guru to figure
them out. Owen also told me that they didn't want to start adding
a lot of hacks to GDK to let a WM use it; we both agreed back in
the mists of time that metacity would only use it for the "UI"
bits as it does.

Having the split in the source code contains and makes very clear
the interface between the WM and GDK/GTK. This keeps people from
introducing extra GDK/GTK usage when it isn't needed or
appropriate. Also, it speeds up the compilation a bit, though this
was perhaps more relevant 5 years ago than it is now.

There was also a very old worry that the GDK stuff might have to
be in a separate process to work right; that turned out to be
untrue. Though who knows what issues the CM will introduce."

Remember that strings stored in X properties are not in UTF-8, and they
have to end up in UTF-8 before we try putting them through Pango.

If you make any X request involving a client window, you have to
meta_error_trap_push() around the call; this is not necessary for X
requests on the frame windows.

Remember that not all windows have frames, and window->frame can be NULL.

Other important reading & where to get started
Extra reading

There are some other important things to read to get oriented as well.
These are:
http://pobox.com/~hp/features.html
rationales.txt
doc/code-overview.txt

It pays to read http://pobox.com/~hp/features.html in order
to understand the philosophy of Metacity.

The rationales.txt file has two things: (1) a list of design choices with
links in the form of bugzilla bugs that discuss the issue, and (2) a list
outstanding bug categories, each of which is tracked by a particular
tracker bug in bugzilla from which you can find several closely related
bug reports.

doc/code-overview.txt provides a fairly good overview of the code,
including coverage of the function of the various files, the main
structures and their relationships, and places to start looking in the
code tailored to general categories of tasks.

Ideas for tasks to work on

There are a variety of things you could work on in the code. You may
have ideas of your own, but in case you don't, let me provide a list of
ideas you could choose from:

If you're ambitious, there's a list of things Havoc made that he'd really
like to see tackled, which you can find at
http://log.ometer.com/2004-05.html. Be sure to double check with someone
to make sure the item is still relevant if you're interested in one of
these. Another place to look for ideas, of course, is bugzilla. One can
just do queries and look for things that look fixable.

However, perhaps the best way of getting ideas of related tasks to work
on, is to look at the second half of the rationales.txt file, which tries
to group bugs by type.

+ 365
- 0
INSTALL View File

@@ -0,0 +1,365 @@
Installation Instructions
*************************

Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005,
2006, 2007, 2008, 2009 Free Software Foundation, Inc.

Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. This file is offered as-is,
without warranty of any kind.

Basic Installation
==================

Briefly, the shell commands `./configure; make; make install' should
configure, build, and install this package. The following
more-detailed instructions are generic; see the `README' file for
instructions specific to this package. Some packages provide this
`INSTALL' file but do not implement all of the features documented
below. The lack of an optional feature in a given package is not
necessarily a bug. More recommendations for GNU packages can be found
in *note Makefile Conventions: (standards)Makefile Conventions.

The `configure' shell script attempts to guess correct values for
various system-dependent variables used during compilation. It uses
those values to create a `Makefile' in each directory of the package.
It may also create one or more `.h' files containing system-dependent
definitions. Finally, it creates a shell script `config.status' that
you can run in the future to recreate the current configuration, and a
file `config.log' containing compiler output (useful mainly for
debugging `configure').

It can also use an optional file (typically called `config.cache'
and enabled with `--cache-file=config.cache' or simply `-C') that saves
the results of its tests to speed up reconfiguring. Caching is
disabled by default to prevent problems with accidental use of stale
cache files.

If you need to do unusual things to compile the package, please try
to figure out how `configure' could check whether to do them, and mail
diffs or instructions to the address given in the `README' so they can
be considered for the next release. If you are using the cache, and at
some point `config.cache' contains results you don't want to keep, you
may remove or edit it.

The file `configure.ac' (or `configure.in') is used to create
`configure' by a program called `autoconf'. You need `configure.ac' if
you want to change it or regenerate `configure' using a newer version
of `autoconf'.

The simplest way to compile this package is:

1. `cd' to the directory containing the package's source code and type
`./configure' to configure the package for your system.

Running `configure' might take a while. While running, it prints
some messages telling which features it is checking for.

2. Type `make' to compile the package.

3. Optionally, type `make check' to run any self-tests that come with
the package, generally using the just-built uninstalled binaries.

4. Type `make install' to install the programs and any data files and
documentation. When installing into a prefix owned by root, it is
recommended that the package be configured and built as a regular
user, and only the `make install' phase executed with root
privileges.

5. Optionally, type `make installcheck' to repeat any self-tests, but
this time using the binaries in their final installed location.
This target does not install anything. Running this target as a
regular user, particularly if the prior `make install' required
root privileges, verifies that the installation completed
correctly.

6. You can remove the program binaries and object files from the
source code directory by typing `make clean'. To also remove the
files that `configure' created (so you can compile the package for
a different kind of computer), type `make distclean'. There is
also a `make maintainer-clean' target, but that is intended mainly
for the package's developers. If you use it, you may have to get
all sorts of other programs in order to regenerate files that came
with the distribution.

7. Often, you can also type `make uninstall' to remove the installed
files again. In practice, not all packages have tested that
uninstallation works correctly, even though it is required by the
GNU Coding Standards.

8. Some packages, particularly those that use Automake, provide `make
distcheck', which can by used by developers to test that all other
targets like `make install' and `make uninstall' work correctly.
This target is generally not run by end users.

Compilers and Options
=====================

Some systems require unusual options for compilation or linking that
the `configure' script does not know about. Run `./configure --help'
for details on some of the pertinent environment variables.

You can give `configure' initial values for configuration parameters
by setting variables in the command line or in the environment. Here
is an example:

./configure CC=c99 CFLAGS=-g LIBS=-lposix

*Note Defining Variables::, for more details.

Compiling For Multiple Architectures
====================================

You can compile the package for more than one kind of computer at the
same time, by placing the object files for each architecture in their
own directory. To do this, you can use GNU `make'. `cd' to the
directory where you want the object files and executables to go and run
the `configure' script. `configure' automatically checks for the
source code in the directory that `configure' is in and in `..'. This
is known as a "VPATH" build.

With a non-GNU `make', it is safer to compile the package for one
architecture at a time in the source code directory. After you have
installed the package for one architecture, use `make distclean' before
reconfiguring for another architecture.

On MacOS X 10.5 and later systems, you can create libraries and
executables that work on multiple system types--known as "fat" or
"universal" binaries--by specifying multiple `-arch' options to the
compiler but only a single `-arch' option to the preprocessor. Like
this:

./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
CPP="gcc -E" CXXCPP="g++ -E"

This is not guaranteed to produce working output in all cases, you
may have to build one architecture at a time and combine the results
using the `lipo' tool if you have problems.

Installation Names
==================

By default, `make install' installs the package's commands under
`/usr/local/bin', include files under `/usr/local/include', etc. You
can specify an installation prefix other than `/usr/local' by giving
`configure' the option `--prefix=PREFIX', where PREFIX must be an
absolute file name.

You can specify separate installation prefixes for
architecture-specific files and architecture-independent files. If you
pass the option `--exec-prefix=PREFIX' to `configure', the package uses
PREFIX as the prefix for installing programs and libraries.
Documentation and other data files still use the regular prefix.

In addition, if you use an unusual directory layout you can give
options like `--bindir=DIR' to specify different values for particular
kinds of files. Run `configure --help' for a list of the directories
you can set and what kinds of files go in them. In general, the
default for these options is expressed in terms of `${prefix}', so that
specifying just `--prefix' will affect all of the other directory
specifications that were not explicitly provided.

The most portable way to affect installation locations is to pass the
correct locations to `configure'; however, many packages provide one or
both of the following shortcuts of passing variable assignments to the
`make install' command line to change installation locations without
having to reconfigure or recompile.

The first method involves providing an override variable for each
affected directory. For example, `make install
prefix=/alternate/directory' will choose an alternate location for all
directory configuration variables that were expressed in terms of
`${prefix}'. Any directories that were specified during `configure',
but not in terms of `${prefix}', must each be overridden at install
time for the entire installation to be relocated. The approach of
makefile variable overrides for each directory variable is required by
the GNU Coding Standards, and ideally causes no recompilation.
However, some platforms have known limitations with the semantics of
shared libraries that end up requiring recompilation when using this
method, particularly noticeable in packages that use GNU Libtool.

The second method involves providing the `DESTDIR' variable. For
example, `make install DESTDIR=/alternate/directory' will prepend
`/alternate/directory' before all installation names. The approach of
`DESTDIR' overrides is not required by the GNU Coding Standards, and
does not work on platforms that have drive letters. On the other hand,
it does better at avoiding recompilation issues, and works well even
when some directory options were not specified in terms of `${prefix}'
at `configure' time.

Optional Features
=================

If the package supports it, you can cause programs to be installed
with an extra prefix or suffix on their names by giving `configure' the
option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.

Some packages pay attention to `--enable-FEATURE' options to
`configure', where FEATURE indicates an optional part of the package.
They may also pay attention to `--with-PACKAGE' options, where PACKAGE
is something like `gnu-as' or `x' (for the X Window System). The
`README' should mention any `--enable-' and `--with-' options that the
package recognizes.

For packages that use the X Window System, `configure' can usually
find the X include and library files automatically, but if it doesn't,
you can use the `configure' options `--x-includes=DIR' and
`--x-libraries=DIR' to specify their locations.

Some packages offer the ability to configure how verbose the
execution of `make' will be. For these packages, running `./configure
--enable-silent-rules' sets the default to minimal output, which can be
overridden with `make V=1'; while running `./configure
--disable-silent-rules' sets the default to verbose, which can be
overridden with `make V=0'.

Particular systems
==================

On HP-UX, the default C compiler is not ANSI C compatible. If GNU
CC is not installed, it is recommended to use the following options in
order to use an ANSI C compiler:

./configure CC="cc -Ae -D_XOPEN_SOURCE=500"

and if that doesn't work, install pre-built binaries of GCC for HP-UX.

On OSF/1 a.k.a. Tru64, some versions of the default C compiler cannot
parse its `<wchar.h>' header file. The option `-nodtk' can be used as
a workaround. If GNU CC is not installed, it is therefore recommended
to try

./configure CC="cc"

and if that doesn't work, try

./configure CC="cc -nodtk"

On Solaris, don't put `/usr/ucb' early in your `PATH'. This
directory contains several dysfunctional programs; working variants of
these programs are available in `/usr/bin'. So, if you need `/usr/ucb'
in your `PATH', put it _after_ `/usr/bin'.

On Haiku, software installed for all users goes in `/boot/common',
not `/usr/local'. It is recommended to use the following options:

./configure --prefix=/boot/common

Specifying the System Type
==========================

There may be some features `configure' cannot figure out
automatically, but needs to determine by the type of machine the package
will run on. Usually, assuming the package is built to be run on the
_same_ architectures, `configure' can figure that out, but if it prints
a message saying it cannot guess the machine type, give it the
`--build=TYPE' option. TYPE can either be a short name for the system
type, such as `sun4', or a canonical name which has the form:

CPU-COMPANY-SYSTEM

where SYSTEM can have one of these forms:

OS
KERNEL-OS

See the file `config.sub' for the possible values of each field. If
`config.sub' isn't included in this package, then this package doesn't
need to know the machine type.

If you are _building_ compiler tools for cross-compiling, you should
use the option `--target=TYPE' to select the type of system they will
produce code for.

If you want to _use_ a cross compiler, that generates code for a
platform different from the build platform, you should specify the
"host" platform (i.e., that on which the generated programs will
eventually be run) with `--host=TYPE'.

Sharing Defaults
================

If you want to set default values for `configure' scripts to share,
you can create a site shell script called `config.site' that gives
default values for variables like `CC', `cache_file', and `prefix'.
`configure' looks for `PREFIX/share/config.site' if it exists, then
`PREFIX/etc/config.site' if it exists. Or, you can set the
`CONFIG_SITE' environment variable to the location of the site script.
A warning: not all `configure' scripts look for a site script.

Defining Variables
==================

Variables not defined in a site shell script can be set in the
environment passed to `configure'. However, some packages may run
configure again during the build, and the customized values of these
variables may be lost. In order to avoid this problem, you should set
them in the `configure' command line, using `VAR=value'. For example:

./configure CC=/usr/local2/bin/gcc

causes the specified `gcc' to be used as the C compiler (unless it is
overridden in the site shell script).

Unfortunately, this technique does not work for `CONFIG_SHELL' due to
an Autoconf bug. Until the bug is fixed you can use this workaround:

CONFIG_SHELL=/bin/bash /bin/bash ./configure CONFIG_SHELL=/bin/bash

`configure' Invocation
======================

`configure' recognizes the following options to control how it
operates.

`--help'
`-h'
Print a summary of all of the options to `configure', and exit.

`--help=short'
`--help=recursive'
Print a summary of the options unique to this package's
`configure', and exit. The `short' variant lists options used
only in the top level, while the `recursive' variant lists options
also present in any nested packages.

`--version'
`-V'
Print the version of Autoconf used to generate the `configure'
script, and exit.

`--cache-file=FILE'
Enable the cache: use and save the results of the tests in FILE,
traditionally `config.cache'. FILE defaults to `/dev/null' to
disable caching.

`--config-cache'
`-C'
Alias for `--cache-file=config.cache'.

`--quiet'
`--silent'
`-q'
Do not print messages saying which checks are being made. To
suppress all normal output, redirect it to `/dev/null' (any error
messages will still be shown).

`--srcdir=DIR'
Look for the package's source code in directory DIR. Usually
`configure' can determine that directory automatically.

`--prefix=DIR'
Use DIR as the installation prefix. *note Installation Names::
for more details, including other options available for fine-tuning
the installation locations.

`--no-create'
`-n'
Run the configure checks, but stop before creating any output
files.

`configure' also accepts some other, not widely useful, options. Run
`configure --help' for more details.


+ 8
- 0
MAINTAINERS View File

@@ -0,0 +1,8 @@
Tomas Frydrych
Email: tf linux intel com
Userid: tomasf

Owen Taylor
Email: otaylor redhat com
Userid: otaylor


+ 6
- 0
Makefile.am View File

@@ -0,0 +1,6 @@

SUBDIRS=src po doc

EXTRA_DIST = HACKING MAINTAINERS rationales.txt

DISTCLEANFILES = intltool-extract intltool-merge intltool-update po/stamp-it po/.intltool-merge-cache

+ 809
- 0
Makefile.in View File

@@ -0,0 +1,809 @@
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# gives unlimited permission to copy and/or distribute it,
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Muffin
======

The Cinnamon Window Manager

Based on Mutter 3.2.1

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Metacity is not a meta-City as in an urban center, but rather
Meta-ness as in the state of being meta. i.e. metacity : meta as
opacity : opaque. Also it may have something to do with the Meta key
on UNIX keyboards.

The first release of Metacity was version 2.3. Metacity has no need for
your petty hangups about version numbers.

The stable releases so far are 2.4.x, 2.6.x, 2.8.[01], 2.8.1.x, 2.8.5-,
2.10.x, 2.12.x, 2.14.x, 2.16.x.

Unstable branches are 2.3.x, 2.5.x, 2.8.2-4, 2.9.x, 2.11.x, 2.13.x,
2.15.x, 2.17.x.

COMPILING MUFFIN
===

You need GTK+ 2.2. For startup notification to work you need
libstartup-notification at
http://www.freedesktop.org/software/startup-notification/ or on the
GNOME ftp site. You also need GConf 1.2 (unless building a funky
extra-small embedded metacity with --disable-gconf, see below).
You need Clutter 1.0. You need gobject-introspection 0.6.3.

REPORTING BUGS AND SUBMITTING PATCHES
===

Report new bugs on http://bugzilla.gnome.org. Please check for
duplicates, *especially* if you are reporting a feature request.

Please do *not* add "me too!" or "yes I really want this!" comments to
feature requests in bugzilla. Please read
http://pobox.com/~hp/features.html prior to adding any kind of flame
about missing features or misfeatures.

Feel free to send patches too; Metacity is relatively small and
simple, so if you find a bug or want to add a feature it should be
pretty easy. Send me mail, or put the patch in bugzilla.

See the HACKING file for some notes on hacking Muffin.

MUFFIN FEATURES
===

- Uses GTK+ 2.0 for drawing window frames. This means colors, fonts,
etc. come from GTK+ theme.

- Does not expose the concept of "window manager" to the user. Some
of the features in the GNOME control panel and other parts of the
desktop happen to be implemented in metacity, such as changing your
window border theme, or changing your window navigation shortcuts,
but the user doesn't need to know this.

- Includes only the window manager; does not try to be a desktop
environment. The pager, configuration, etc. are all separate and
modular. The "libwnck" library (which I also wrote) is available
for writing metacity extensions, pagers, and so on. (But libwnck
isn't metacity specific, or GNOME-dependent; it requires only GTK,
and should work with KWin, fvwm2, and other EWMH-compliant WMs.)

- Has a simple theme system and a couple of extra themes come with it.
Change themes via gconf-editor or gconftool or GNOME themes control
panel:
gconftool-2 --type=string --set /apps/metacity/general/theme Crux
gconftool-2 --type=string --set /apps/metacity/general/theme Gorilla
gconftool-2 --type=string --set /apps/metacity/general/theme Atlanta
gconftool-2 --type=string --set /apps/metacity/general/theme Bright

See theme-format.txt for docs on the theme format. Use
metacity-theme-viewer to preview themes.

- Change number of workspaces via gconf-editor or gconftool:
gconftool-2 --type=int --set /apps/metacity/general/num_workspaces 5

Can also change workspaces from GNOME 2 pager.

- Change focus mode:
gconftool-2 --type=string --set /apps/metacity/general/focus_mode mouse
gconftool-2 --type=string --set /apps/metacity/general/focus_mode sloppy
gconftool-2 --type=string --set /apps/metacity/general/focus_mode click

- Global keybinding defaults include:

Alt-Tab forward cycle window focus
Alt-Shift-Tab backward cycle focus
Alt-Ctrl-Tab forward cycle focus among panels
Alt-Ctrl-Shift-Tab backward cycle focus among panels
Alt-Escape cycle window focus without a popup thingy
Ctrl-Alt-Left Arrow previous workspace
Ctrl-Alt-Right Arrow next workspace
Ctrl-Alt-D minimize/unminimize all, to show desktop

Change keybindings for example:

unst gconftool-2 --type=string --set /apps/metacity/global_keybindings/switch_to_workspace_1 '<Alt>F1'
Also try the GNOME keyboard shortcuts control panel, or
gconf-editor.

- Window keybindings:

Alt-space window menu

Mnemonics work in the menu. That is, Alt-space then underlined
letter in the menu item works.

Choose Move from menu, and arrow keys to move the window.

While moving, hold down Control to move slower, and
Shift to snap to edges.

Choose Resize from menu, and nothing happens yet, but
eventually I might implement something.

Keybindings for things like maximize window, vertical maximize,
etc. can be bound, but may not all exist by default. See
metacity.schemas.

- Window mouse bindings:

Clicking anywhere on frame with button 1 will raise/focus window
If you click a window control, such as the close button, then the
control will activate on button release if you are still over it
on release (as with most GUI toolkits)

If you click and drag borders with button 1 it resizes the window
If you click and drag the titlebar with button 1 it moves the
window.

If you click anywhere on the frame with button 2 it lowers the
window.

If you click anywhere on the frame with button 3 it shows the
window menu.

If you hold down Super (windows key) and click inside a window, it
will move the window (buttons 1 and 2) or show menu (button 3).
Or you can configure a different modifier for this.

If you pick up a window with button 1 and then switch workspaces
the window will come with you to the new workspace, this is
a feature copied from Enlightenment.

If you hold down Shift while moving a window, the window snaps
to edges of other windows and the screen.

- Session management:

Muffin connects to the session manager and will set itself up to
be respawned. It theoretically restores sizes/positions/workspace
for session-aware applications.

- Muffin implements much of the EWMH window manager specification
from freedesktop.org, as well as the older ICCCM. Please refer to
the COMPLIANCE file for information on muffin compliance with
these standards.

- Uses Pango to render text, so has cool i18n capabilities.
Supports UTF-8 window titles and such.

- There are simple animations for actions such as minimization,
to help users see what is happening. Should probably
have a few more of these and make them nicer.

- if you have the proper X setup, set the GDK_USE_XFT=1
environment variable to get antialiased window titles.

- considers the panel when placing windows and maximizing
them.

- handles the window manager selection from the ICCCM. Will exit if
another WM claims it, and can claim it from another WM if you pass
the --replace argument. So if you're running another
ICCCM-compliant WM, you can run "muffin --replace" to replace it
with Metacity.

- does basic colormap handling

- and much more! well, maybe not a lot more.

HOW TO ADD EXTERNAL FEATURES