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view man/lispref/x-windows.texi @ 5353:38e24b8be4ea
Improve the lexical scoping in #'block, #'return-from.
lisp/ChangeLog addition:
2011-02-07 Aidan Kehoe <kehoea@parhasard.net>
* bytecomp.el:
* bytecomp.el (byte-compile-initial-macro-environment):
Shadow `block', `return-from' here, we implement them differently
when byte-compiling.
* bytecomp.el (byte-compile-active-blocks): New.
* bytecomp.el (byte-compile-block-1): New.
* bytecomp.el (byte-compile-return-from-1): New.
* bytecomp.el (return-from-1): New.
* bytecomp.el (block-1): New.
These are two aliases that exist to have their own associated
byte-compile functions, which functions implement `block' and
`return-from'.
* cl-extra.el (cl-macroexpand-all):
Fix a bug here when macros in the environment have been compiled.
* cl-macs.el (block):
* cl-macs.el (return):
* cl-macs.el (return-from):
Be more careful about lexical scope in these macros.
* cl.el:
* cl.el ('cl-block-wrapper): Removed.
* cl.el ('cl-block-throw): Removed.
These aren't needed in code generated by this XEmacs. They
shouldn't be needed in code generated by XEmacs 21.4, but if it
turns out the packages do need them, we can put them back.
2011-01-30 Mike Sperber <mike@xemacs.org>
* font-lock.el (font-lock-fontify-pending-extents): Don't fail if
`font-lock-mode' is unset, which can happen in the middle of
`revert-buffer'.
2011-01-23 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (delete):
* cl-macs.el (delq):
* cl-macs.el (remove):
* cl-macs.el (remq):
Don't use the compiler macro if these functions were given the
wrong number of arguments, as happens in lisp-tests.el.
* cl-seq.el (remove, remq): Removed.
I added these to subr.el, and forgot to remove them from here.
2011-01-22 Aidan Kehoe <kehoea@parhasard.net>
* bytecomp.el (byte-compile-setq, byte-compile-set):
Remove kludge allowing keywords' values to be set, all the code
that does that is gone.
* cl-compat.el (elt-satisfies-test-p):
* faces.el (set-face-parent):
* faces.el (face-doc-string):
* gtk-font-menu.el:
* gtk-font-menu.el (gtk-reset-device-font-menus):
* msw-font-menu.el:
* msw-font-menu.el (mswindows-reset-device-font-menus):
* package-get.el (package-get-installedp):
* select.el (select-convert-from-image-data):
* sound.el:
* sound.el (load-sound-file):
* x-font-menu.el (x-reset-device-font-menus-core):
Don't quote keywords, they're self-quoting, and the
win from backward-compatibility is sufficiently small now that the
style problem overrides it.
2011-01-22 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (block, return-from): Require that NAME be a symbol
in these macros, as always documented in the #'block docstring and
as required by Common Lisp.
* descr-text.el (unidata-initialize-unihan-database):
Correct the use of non-symbols in #'block and #'return-from in
this function.
2011-01-15 Aidan Kehoe <kehoea@parhasard.net>
* cl-extra.el (concatenate): Accept more complicated TYPEs in this
function, handing the sequences over to #'coerce if we don't
understand them here.
* cl-macs.el (inline): Don't proclaim #'concatenate as inline, its
compiler macro is more useful than doing that.
2011-01-11 Aidan Kehoe <kehoea@parhasard.net>
* subr.el (delete, delq, remove, remq): Move #'remove, #'remq
here, they don't belong in cl-seq.el; move #'delete, #'delq here
from fns.c, implement them in terms of #'delete*, allowing support
for sequences generally.
* update-elc.el (do-autoload-commands): Use #'delete*, not #'delq
here, now the latter's no longer dumped.
* cl-macs.el (delete, delq): Add compiler macros transforming
#'delete and #'delq to #'delete* calls.
2011-01-10 Aidan Kehoe <kehoea@parhasard.net>
* dialog.el (make-dialog-box): Correct a misplaced parenthesis
here, thank you Mats Lidell in 87zkr9gqrh.fsf@mail.contactor.se !
2011-01-02 Aidan Kehoe <kehoea@parhasard.net>
* dialog.el (make-dialog-box):
* list-mode.el (display-completion-list):
These functions used to use cl-parsing-keywords; change them to
use defun* instead, fixing the build. (Not sure what led to me
not including this change in d1b17a33450b!)
2011-01-02 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (define-star-compiler-macros):
Make sure the form has ITEM and LIST specified before attempting
to change to calls with explicit tests; necessary for some tests
in lisp-tests.el to compile correctly.
(stable-union, stable-intersection): Add compiler macros for these
functions, in the same way we do for most of the other functions
in cl-seq.el.
2011-01-01 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (dolist, dotimes, do-symbols, macrolet)
(symbol-macrolet):
Define these macros with defmacro* instead of parsing the argument
list by hand, for the sake of style and readability; use backquote
where appropriate, instead of calling #'list and and friends, for
the same reason.
2010-12-30 Aidan Kehoe <kehoea@parhasard.net>
* x-misc.el (device-x-display):
Provide this function, documented in the Lispref for years, but
not existing previously. Thank you Julian Bradfield, thank you
Jeff Mincy.
2010-12-30 Aidan Kehoe <kehoea@parhasard.net>
* cl-seq.el:
Move the heavy lifting from this file to C. Dump the
cl-parsing-keywords macro, but don't use defun* for the functions
we define that do take keywords, dynamic scope lossage makes that
not practical.
* subr.el (sort, fillarray): Move these aliases here.
(map-plist): #'nsublis is now built-in, but at this point #'eql
isn't necessarily available as a test; use #'eq.
* obsolete.el (cl-delete-duplicates): Make this available for old
compiler macros and old code.
(memql): Document that this is equivalent to #'member*, and worse.
* cl.el (adjoin, subst): Removed. These are in C.
2010-12-30 Aidan Kehoe <kehoea@parhasard.net>
* simple.el (assoc-ignore-case): Remove a duplicate definition of
this function (it's already in subr.el).
* iso8859-1.el (char-width):
On non-Mule, make this function equivalent to that produced by
(constantly 1), but preserve its docstring.
* subr.el (subst-char-in-string): Define this in terms of
#'substitute, #'nsubstitute.
(string-width): Define this using #'reduce and #'char-width.
(char-width): Give this a simpler definition, it makes far more
sense to check for mule at load time and redefine, as we do in
iso8859-1.el.
(store-substring): Implement this in terms of #'replace, now
#'replace is cheap.
2010-12-30 Aidan Kehoe <kehoea@parhasard.net>
* update-elc.el (lisp-files-needed-for-byte-compilation)
(lisp-files-needing-early-byte-compilation):
cl-macs belongs in the former, not the latter, it is as
fundamental as bytecomp.el.
2010-12-30 Aidan Kehoe <kehoea@parhasard.net>
* cl.el:
Provde the Common Lisp program-error, type-error as error
symbols. This doesn't nearly go far enough for anyone using the
Common Lisp errors.
2010-12-29 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (delete-duplicates):
If the form has an incorrect number of arguments, don't attempt a
compiler macroexpansion.
2010-12-29 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (cl-safe-expr-p):
Forms that start with the symbol lambda are also safe.
2010-12-29 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (= < > <= >=):
For these functions' compiler macros, the optimisation is safe
even if the first and the last arguments have side effects, since
they're only used the once.
2010-12-29 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (inline-side-effect-free-compiler-macros):
Unroll a loop here at macro-expansion time, so these compiler
macros are compiled. Use #'eql instead of #'eq in a couple of
places for better style.
2010-12-29 Aidan Kehoe <kehoea@parhasard.net>
* cl-extra.el (notany, notevery): Avoid some dynamic scope
stupidity with local variable names in these functions, when they
weren't prefixed with cl-; go into some more detail in the doc
strings.
2010-12-29 Aidan Kehoe <kehoea@parhasard.net>
* byte-optimize.el (side-effect-free-fns): #'remove, #'remq are
free of side-effects.
(side-effect-and-error-free-fns):
Drop dot, dot-marker from the list.
2010-11-17 Aidan Kehoe <kehoea@parhasard.net>
* cl-extra.el (coerce):
In the argument list, name the first argument OBJECT, not X; the
former name was always used in the doc string and is clearer.
Handle vector type specifications which include the length of the
target sequence, error if there's a mismatch.
* cl-macs.el (cl-make-type-test): Handle type specifications
starting with the symbol 'eql.
2010-11-14 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (eql): Don't remove the byte-compile property of this
symbol. That was necessary to override a bug in bytecomp.el where
#'eql was confused with #'eq, which bug we no longer have.
If neither expression is constant, don't attempt to handle the
expression in this compiler macro, leave it to byte-compile-eql,
which produces better code anyway.
* bytecomp.el (eq): #'eql is not the function associated with the
byte-eq byte code.
(byte-compile-eql): Add an explicit compile method for this
function, for cases where the cl-macs compiler macro hasn't
reduced it to #'eq or #'equal.
2010-10-25 Aidan Kehoe <kehoea@parhasard.net>
Add compiler macros and compilation sanity-checking for various
functions that take keywords.
* byte-optimize.el (side-effect-free-fns): #'symbol-value is
side-effect free and not error free.
* bytecomp.el (byte-compile-normal-call): Check keyword argument
lists for sanity; store information about the positions where
keyword arguments start using the new byte-compile-keyword-start
property.
* cl-macs.el (cl-const-expr-val): Take a new optional argument,
cl-not-constant, defaulting to nil, in this function; return it if
the expression is not constant.
(cl-non-fixnum-number-p): Make this into a separate function, we
want to pass it to #'every.
(eql): Use it.
(define-star-compiler-macros): Use the same code to generate the
member*, assoc* and rassoc* compiler macros; special-case some
code in #'add-to-list in subr.el.
(remove, remq): Add compiler macros for these two functions, in
preparation for #'remove being in C.
(define-foo-if-compiler-macros): Transform (remove-if-not ...) calls to
(remove ... :if-not) at compile time, which will be a real win
once the latter is in C.
(define-substitute-if-compiler-macros)
(define-subst-if-compiler-macros): Similarly for these functions.
(delete-duplicates): Change this compiler macro to use
#'plists-equal; if we don't have information about the type of
SEQUENCE at compile time, don't bother attempting to inline the
call, the function will be in C soon enough.
(equalp): Remove an old commented-out compiler macro for this, if
we want to see it it's in version control.
(subst-char-in-string): Transform this to a call to nsubstitute or
nsubstitute, if that is appropriate.
* cl.el (ldiff): Don't call setf here, this makes for a load-time
dependency problem in cl-macs.el
2010-06-14 Stephen J. Turnbull <stephen@xemacs.org>
* term/vt100.el:
Refer to XEmacs, not GNU Emacs, in permissions.
* term/bg-mouse.el:
* term/sup-mouse.el:
Put copyright notice in canonical "Copyright DATE AUTHOR" form.
Refer to XEmacs, not GNU Emacs, in permissions.
* site-load.el:
Add permission boilerplate.
* mule/canna-leim.el:
* alist.el:
Refer to XEmacs, not APEL/this program, in permissions.
* mule/canna-leim.el:
Remove my copyright, I've assigned it to the FSF.
2010-06-14 Stephen J. Turnbull <stephen@xemacs.org>
* gtk.el:
* gtk-widget-accessors.el:
* gtk-package.el:
* gtk-marshal.el:
* gtk-compose.el:
* gnome.el:
Add copyright notice based on internal evidence.
2010-06-14 Stephen J. Turnbull <stephen@xemacs.org>
* easymenu.el: Add reference to COPYING to permission notice.
* gutter.el:
* gutter-items.el:
* menubar-items.el:
Fix typo "Xmacs" in permissions notice.
2010-06-14 Stephen J. Turnbull <stephen@xemacs.org>
* auto-save.el:
* font.el:
* fontconfig.el:
* mule/kinsoku.el:
Add "part of XEmacs" text to permission notice.
2010-10-14 Aidan Kehoe <kehoea@parhasard.net>
* byte-optimize.el (side-effect-free-fns):
* cl-macs.el (remf, getf):
* cl-extra.el (tailp, cl-set-getf, cl-do-remf):
* cl.el (ldiff, endp):
Tighten up Common Lisp compatibility for #'ldiff, #'endp, #'tailp;
add circularity checking for the first two.
#'cl-set-getf and #'cl-do-remf were Lisp implementations of
#'plist-put and #'plist-remprop; change the names to aliases,
changes the macros that use them to using #'plist-put and
#'plist-remprop directly.
2010-10-12 Aidan Kehoe <kehoea@parhasard.net>
* abbrev.el (fundamental-mode-abbrev-table, global-abbrev-table):
Create both these abbrev tables using the usual
#'define-abbrev-table calls, rather than attempting to
special-case them.
* cl-extra.el: Force cl-macs to be loaded here, if cl-extra.el is
being loaded interpreted. Previously other, later files would
redundantly call (load "cl-macs") when interpreted, it's more
reasonable to do it here, once.
* cmdloop.el (read-quoted-char-radix): Use defcustom here, we
don't have any dump-order dependencies that would prevent that.
* custom.el (eval-when-compile): Don't load cl-macs when
interpreted or when byte-compiling, rely on cl-extra.el in the
former case and the appropriate entry in bytecomp-load-hook in the
latter. Get rid of custom-declare-variable-list, we have no
dump-time dependencies that would require it.
* faces.el (eval-when-compile): Don't load cl-macs when
interpreted or when byte-compiling.
* packages.el: Remove some inaccurate comments.
* post-gc.el (cleanup-simple-finalizers): Use #'delete-if-not
here, now the order of preloaded-file-list has been changed to
make it available.
* subr.el (custom-declare-variable-list): Remove. No need for it.
Also remove a stub define-abbrev-table from this file, given the
current order of preloaded-file-list there's no need for it.
2010-10-10 Aidan Kehoe <kehoea@parhasard.net>
* bytecomp.el (byte-compile-constp) Forms quoted with FUNCTION are
also constant.
(byte-compile-initial-macro-environment): In #'the, if FORM is
constant and does not match TYPE, warn at byte-compile time.
2010-10-10 Aidan Kehoe <kehoea@parhasard.net>
* backquote.el (bq-vector-contents, bq-list*): Remove; the former
is equivalent to (append VECTOR nil), the latter to (list* ...).
(bq-process-2): Use (append VECTOR nil) instead of using
#'bq-vector-contents to convert to a list.
(bq-process-1): Now we use list* instead of bq-list
* subr.el (list*): Moved from cl.el, since it is now required to
be available the first time a backquoted form is encountered.
* cl.el (list*): Move to subr.el.
2010-09-16 Aidan Kehoe <kehoea@parhasard.net>
* test-harness.el (Check-Message):
Add an omitted comma here, thank you the buildbot.
2010-09-16 Aidan Kehoe <kehoea@parhasard.net>
* hash-table.el (hash-table-key-list, hash-table-value-list)
(hash-table-key-value-alist, hash-table-key-value-plist):
Remove some useless #'nreverse calls in these files; our hash
tables have no order, it's not helpful to pretend they do.
* behavior.el (read-behavior):
Do the same in this file, in some code evidently copied from
hash-table.el.
2010-09-16 Aidan Kehoe <kehoea@parhasard.net>
* info.el (Info-insert-dir):
* format.el (format-deannotate-region):
* files.el (cd, save-buffers-kill-emacs):
Use #'some, #'every and related functions for applying boolean
operations to lists, instead of rolling our own ones that cons and
don't short-circuit.
2010-09-16 Aidan Kehoe <kehoea@parhasard.net>
* bytecomp.el (byte-compile-initial-macro-environment):
* cl-macs.el (the):
Rephrase the docstring, make its implementation when compiling
files a little nicer.
2010-09-16 Aidan Kehoe <kehoea@parhasard.net>
* descr-text.el (unidata-initialize-unicodedata-database)
(unidata-initialize-unihan-database, describe-char-unicode-data)
(describe-char-unicode-data):
Wrap calls to the database functions with (with-fboundp ...),
avoiding byte compile warnings on builds without support for the
database functions.
(describe-char): (reduce #'max ...), not (apply #'max ...), no
need to cons needlessly.
(describe-char): Remove a redundant lambda wrapping
#'extent-properties.
(describe-char-unicode-data): Call #'nsubst when replacing "" with
nil in the result of #'split-string, instead of consing inside
mapcar.
2010-09-16 Aidan Kehoe <kehoea@parhasard.net>
* x-faces.el (x-available-font-sizes):
* specifier.el (let-specifier):
* package-ui.el (pui-add-required-packages):
* msw-faces.el (mswindows-available-font-sizes):
* modeline.el (modeline-minor-mode-menu):
* minibuf.el (minibuf-directory-files):
Replace the O2N (delq nil (mapcar (lambda (W) (and X Y)) Z)) with
the ON (mapcan (lambda (W) (and X (list Y))) Z) in these files.
2010-09-16 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (= < > <= >=):
When these functions are handed more than two arguments, and those
arguments have no side effects, transform to a series of two
argument calls, avoiding funcall in the byte-compiled code.
* mule/mule-cmds.el (finish-set-language-environment):
Take advantage of this change in a function called 256 times at
startup.
2010-09-16 Aidan Kehoe <kehoea@parhasard.net>
* bytecomp.el (byte-compile-function-form, byte-compile-quote)
(byte-compile-quote-form):
Warn at compile time, and error at runtime, if a (quote ...) or a
(function ...) form attempts to quote more than one object.
2010-09-16 Aidan Kehoe <kehoea@parhasard.net>
* byte-optimize.el (byte-optimize-apply): Transform (apply 'nconc
(mapcar ...)) to (mapcan ...); warn about use of the first idiom.
* update-elc.el (do-autoload-commands):
* packages.el (packages-find-package-library-path):
* frame.el (frame-list):
* extents.el (extent-descendants):
* etags.el (buffer-tag-table-files):
* dumped-lisp.el (preloaded-file-list):
* device.el (device-list):
* bytecomp-runtime.el (proclaim-inline, proclaim-notinline)
Use #'mapcan, not (apply #'nconc (mapcar ...) in all these files.
* bytecomp-runtime.el (eval-when-compile, eval-and-compile):
In passing, mention that these macros also evaluate the body when
interpreted.
tests/ChangeLog addition:
2011-02-07 Aidan Kehoe <kehoea@parhasard.net>
* automated/lisp-tests.el:
Test lexical scope for `block', `return-from'; add a
Known-Bug-Expect-Failure for a contorted example that fails when
byte-compiled.
author | Aidan Kehoe <kehoea@parhasard.net> |
---|---|
date | Mon, 07 Feb 2011 12:01:24 +0000 (2011-02-07) |
parents | 33f0f28b945c |
children | 9fae6227ede5 |
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@c -*-texinfo-*- @c This is part of the XEmacs Lisp Reference Manual. @c Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc. @c See the file lispref.texi for copying conditions. @setfilename ../../info/x-windows.texinfo @node X-Windows, ToolTalk Support, System Interface, Top @chapter Functions Specific to the X Window System @cindex X @cindex X-Windows @c This section is largely different from the one in FSF Emacs. XEmacs provides the concept of @dfn{devices}, which generalizes connections to an X server, a TTY device, etc. Most information about an X server that XEmacs is connected to can be determined through general console and device functions. @xref{Consoles and Devices}. However, there are some features of the X Window System that do not generalize well, and they are covered specially here. @menu * X Selections:: Transferring text to and from other X clients. * X Server:: Information about the X server connected to a particular device. * X Miscellaneous:: Other X-specific functions and variables. @end menu @node X Selections @section X Selections @cindex selection (for X windows) The X server records a set of @dfn{selections} which permit transfer of data between application programs. The various selections are distinguished by @dfn{selection types}, represented in XEmacs by symbols. X clients including XEmacs can read or set the selection for any given type. @defun x-own-selection data &optional type This function sets a ``selection'' in the X server. It takes two arguments: a value, @var{data}, and the selection type @var{type} to assign it to. @var{data} may be a string, a cons of two markers, or an extent. In the latter cases, the selection is considered to be the text between the markers, or between the extent's endpoints. Each possible @var{type} has its own selection value, which changes independently. The usual values of @var{type} are @code{PRIMARY} and @code{SECONDARY}; these are symbols with upper-case names, in accord with X Windows conventions. The default is @code{PRIMARY}. (In FSF Emacs, this function is called @code{x-set-selection} and takes different arguments.) @end defun @defun x-get-selection This function accesses selections set up by XEmacs or by other X clients. It returns the value of the current primary selection. @end defun @defun x-disown-selection &optional secondary-p Assuming we own the selection, this function disowns it. If @var{secondary-p} is non-@code{nil}, the secondary selection instead of the primary selection is discarded. @end defun @cindex cut buffer The X server also has a set of numbered @dfn{cut buffers} which can store text or other data being moved between applications. Cut buffers are considered obsolete, but XEmacs supports them for the sake of X clients that still use them. @defun x-get-cutbuffer &optional n This function returns the contents of cut buffer number @var{n}. (This function is called @code{x-get-cut-buffer} in FSF Emacs.) @end defun @defun x-store-cutbuffer string &optional push This function stores @var{string} into the first cut buffer (cut buffer 0). Normally, the contents of the first cut buffer are simply replaced by @var{string}. However, if optional argument @var{push} is non-@code{nil}, the cut buffers are rotated. This means that the previous value of the first cut buffer moves to the second cut buffer, and the second to the third, and so on, moving the other values down through the series of cut buffers, kill-ring-style. There are 8 cut buffers altogether. Cut buffers are considered obsolete; you should use selections instead. This function has no effect if support for cut buffers was not compiled in. This function is called @code{x-set-cut-buffer} in FSF Emacs. @end defun @node X Server @section X Server This section describes how to access and change the overall status of the X server XEmacs is using. @menu * Resources:: Getting resource values from the server. * Server Data:: Getting info about the X server. * Grabs:: Restricting access to the server by other apps. @end menu @node Resources @subsection Resources @defun default-x-device This function return the default X device for resourcing. This is the first-created X device that still exists. @end defun @defun x-get-resource name class type &optional locale device noerror This function retrieves a resource value from the X resource manager. @itemize @bullet @item The first arg is the name of the resource to retrieve, such as @samp{"font"}. @item The second arg is the class of the resource to retrieve, like @samp{"Font"}. @item The third arg should be one of the symbols @code{string}, @code{integer}, @code{natnum}, or @code{boolean}, specifying the type of object that the database is searched for. @item The fourth arg is the locale to search for the resources on, and can currently be a buffer, a frame, a device, or the symbol @code{global}. If omitted, it defaults to @code{global}. @item The fifth arg is the device to search for the resources on. (The resource database for a particular device is constructed by combining non-device- specific resources such any command-line resources specified and any app-defaults files found [or the fallback resources supplied by XEmacs, if no app-defaults file is found] with device-specific resources such as those supplied using @samp{xrdb}.) If omitted, it defaults to the device of @var{locale}, if a device can be derived (i.e. if @var{locale} is a frame or device), and otherwise defaults to the value of @code{default-x-device}. @item The sixth arg @var{noerror}, if non-@code{nil}, means do not signal an error if a bogus resource specification was retrieved (e.g. if a non-integer was given when an integer was requested). In this case, a warning is issued instead. @end itemize The resource names passed to this function are looked up relative to the locale. If you want to search for a subresource, you just need to specify the resource levels in @var{name} and @var{class}. For example, @var{name} could be @samp{"modeline.attributeFont"}, and @var{class} @samp{"Face.AttributeFont"}. Specifically, @enumerate @item If @var{locale} is a buffer, a call @example @code{(x-get-resource "foreground" "Foreground" 'string @var{some-buffer})} @end example is an interface to a C call something like @example @code{XrmGetResource (db, "xemacs.buffer.@var{buffer-name}.foreground", "Emacs.EmacsLocaleType.EmacsBuffer.Foreground", "String");} @end example @item If @var{locale} is a frame, a call @example @code{(x-get-resource "foreground" "Foreground" 'string @var{some-frame})} @end example is an interface to a C call something like @example @code{XrmGetResource (db, "xemacs.frame.@var{frame-name}.foreground", "Emacs.EmacsLocaleType.EmacsFrame.Foreground", "String");} @end example @item If @var{locale} is a device, a call @example @code{(x-get-resource "foreground" "Foreground" 'string @var{some-device})} @end example is an interface to a C call something like @example @code{XrmGetResource (db, "xemacs.device.@var{device-name}.foreground", "Emacs.EmacsLocaleType.EmacsDevice.Foreground", "String");} @end example @item If @var{locale} is the symbol @code{global}, a call @example @code{(x-get-resource "foreground" "Foreground" 'string 'global)} @end example is an interface to a C call something like @example @code{XrmGetResource (db, "xemacs.foreground", "Emacs.Foreground", "String");} @end example @end enumerate Note that for @code{global}, no prefix is added other than that of the application itself; thus, you can use this locale to retrieve arbitrary application resources, if you really want to. The returned value of this function is @code{nil} if the queried resource is not found. If @var{type} is @code{string}, a string is returned, and if it is @code{integer}, an integer is returned. If @var{type} is @code{boolean}, then the returned value is the list @code{(t)} for true, @code{(nil)} for false, and is @code{nil} to mean ``unspecified''. @end defun @defun x-put-resource resource-line &optional device This function adds a resource to the resource database for @var{device}. @var{resource-line} specifies the resource to add and should be a standard resource specification. @end defun @defvar x-emacs-application-class This variable holds The X application class of the XEmacs process. This controls, among other things, the name of the ``app-defaults'' file that XEmacs will use. For changes to this variable to take effect, they must be made before the connection to the X server is initialized, that is, this variable may only be changed before XEmacs is dumped, or by setting it in the file @file{lisp/term/x-win.el}. By default, this variable is @code{nil} at startup. When the connection to the X server is first initialized, the X resource database will be consulted and the value will be set according to whether any resources are found for the application class ``XEmacs''. @end defvar @node Server Data @subsection Data about the X Server This section describes functions and a variable that you can use to get information about the capabilities and origin of the X server corresponding to a particular device. The device argument is generally optional and defaults to the selected device. @defun x-server-version &optional device This function returns the list of version numbers of the X server @var{device} is on. The returned value is a list of three integers: the major and minor version numbers of the X protocol in use, and the vendor-specific release number. @end defun @defun x-server-vendor &optional device This function returns the vendor supporting the X server @var{device} is on. @end defun @defun x-display-visual-class &optional device This function returns the visual class of the display @var{device} is on. The value is one of the symbols @code{static-gray}, @code{gray-scale}, @code{static-color}, @code{pseudo-color}, @code{true-color}, and @code{direct-color}. (Note that this is different from previous versions of XEmacs, which returned @code{StaticGray}, @code{GrayScale}, etc.) @end defun @node Grabs @subsection Restricting Access to the Server by Other Apps @defun x-grab-keyboard &optional device This function grabs the keyboard on the given device (defaulting to the selected one). So long as the keyboard is grabbed, all keyboard events will be delivered to XEmacs---it is not possible for other X clients to eavesdrop on them. Ungrab the keyboard with @code{x-ungrab-keyboard} (use an @code{unwind-protect}). Returns @code{t} if the grab was successful; @code{nil} otherwise. @end defun @defun x-ungrab-keyboard &optional device This function releases a keyboard grab made with @code{x-grab-keyboard}. @end defun @defun x-grab-pointer &optional device cursor ignore-keyboard This function grabs the pointer and restricts it to its current window. If optional @var{device} argument is @code{nil}, the selected device will be used. If optional @var{cursor} argument is non-@code{nil}, change the pointer shape to that until @code{x-ungrab-pointer} is called (it should be an object returned by the @code{make-cursor} function). If the second optional argument @var{ignore-keyboard} is non-@code{nil}, ignore all keyboard events during the grab. Returns @code{t} if the grab is successful, @code{nil} otherwise. @end defun @defun x-ungrab-pointer &optional device This function releases a pointer grab made with @code{x-grab-pointer}. If optional first arg @var{device} is @code{nil} the selected device is used. If it is @code{t} the pointer will be released on all X devices. @end defun @node X Miscellaneous @section Miscellaneous X Functions and Variables @defvar x-bitmap-file-path This variable holds a list of the directories in which X bitmap files may be found. If @code{nil}, this is initialized from the @samp{"*bitmapFilePath"} resource. This is used by the @code{make-image-instance} function (however, note that if the environment variable @samp{XBMLANGPATH} is set, it is consulted first). @end defvar @defvar x-library-search-path This variable holds the search path used by @code{read-color} to find @file{rgb.txt}. @end defvar @defun x-valid-keysym-name-p keysym This function returns true if @var{keysym} names a keysym that the X library knows about. Valid keysyms are listed in the files @file{/usr/include/X11/keysymdef.h} and in @file{/usr/lib/X11/XKeysymDB}, or whatever the equivalents are on your system. @end defun @defun x-window-id &optional frame This function returns the ID of the X11 window. This gives us a chance to manipulate the Emacs window from within a different program. Since the ID is an unsigned long, we return it as a string. @end defun @defvar x-allow-sendevents If non-@code{nil}, synthetic events are allowed. @code{nil} means they are ignored. Beware: allowing XEmacs to process SendEvents opens a big security hole. @end defvar @defun x-debug-mode arg &optional device With a true arg, make the connection to the X server synchronous. With false, make it asynchronous. Synchronous connections are much slower, but are useful for debugging. (If you get X errors, make the connection synchronous, and use a debugger to set a breakpoint on @code{x_error_handler}. Your backtrace of the C stack will now be useful. In asynchronous mode, the stack above @code{x_error_handler} isn't helpful because of buffering.) If @var{device} is not specified, the selected device is assumed. Calling this function is the same as calling the C function @code{XSynchronize}, or starting the program with the @samp{-sync} command line argument. @end defun @defvar x-debug-events If non-zero, debug information about events that XEmacs sees is displayed. Information is displayed on stderr. Currently defined values are: @itemize @bullet @item 1 == non-verbose output @item 2 == verbose output @end itemize @end defvar