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authorRichard M. Stallman <rms@gnu.org>1994-05-01 09:17:11 +0000
committerRichard M. Stallman <rms@gnu.org>1994-05-01 09:17:11 +0000
commit05e3aa502b1267d5052ea62f5898517bcc3afeac (patch)
tree1c127adceec64d24bb287efad4bfc28b421f5529 /lispref
parent021e46be237b30db6becf4ec4e9859853007a0e3 (diff)
downloademacs-05e3aa502b1267d5052ea62f5898517bcc3afeac.tar.gz
*** empty log message ***
Diffstat (limited to 'lispref')
-rw-r--r--lispref/edebug.texi330
-rw-r--r--lispref/keymaps.texi823
2 files changed, 524 insertions, 629 deletions
diff --git a/lispref/edebug.texi b/lispref/edebug.texi
index c36ac42768e..991ea0a5391 100644
--- a/lispref/edebug.texi
+++ b/lispref/edebug.texi
@@ -7,7 +7,7 @@
@c , Bugs and Todo List, Top, Top
-@node Edebug, Bugs and Todo List, Top, Top
+@node Edebug,, Compilation Errors, Debugging
@section Edebug
@cindex Edebug mode
@@ -152,12 +152,7 @@ display a list of all Edebug commands.
In order to use Edebug to debug Lisp code, you must first
@dfn{instrument} the code. Instrumenting code inserts additional code
-into it, code which invokes Edebug at the proper places.
-
- Once a function is instrumented, any call to the function activates
-Edebug. This may or may not stop execution, depending on the Edebug
-execution mode in use. Some Edebug modes only update the display to
-indicate the progress of the evaluation without stopping execution.
+into it, to invoke Edebug at the proper places.
@kindex C-M-x
@findex eval-defun (Edebug)
@@ -217,7 +212,7 @@ must tell it; @xref{Instrumenting Macro Calls}, for details.
@findex eval-expression (Edebug)
To remove instrumentation from a definition, simply reevaluate its
definition in a way that does not instrument. There are two ways of
-evaluating forms without instrumenting them: from a file with
+evaluating forms that never instrument them: from a file with
@code{load}, and from the minibuffer with @code{eval-expression}
(@kbd{M-ESC}).
@@ -233,7 +228,7 @@ inside of Edebug.
@cindex Edebug execution modes
Edebug supports several execution modes for running the program you are
debugging. We call these alternatives @dfn{Edebug execution modes}; do
-not confuse them with major or minor modes. The current Edebug mode
+not confuse them with major or minor modes. The current Edebug execution mode
determines how far Edebug continues execution before stopping---whether
it stops at each stop point, or continues to the next breakpoint, for
example---and how much Edebug displays the progress of the evaluation
@@ -281,13 +276,13 @@ can still stop the program by typing @kbd{S}, or any editing command.
@end table
In general, the execution modes earlier in the above list run the
-program more slowly or stop sooner.
+program more slowly or stop sooner than the modes later in the list.
While executing or tracing, you can interrupt the execution by typing
any Edebug command. Edebug stops the program at the next stop point and
-then executes the command that you typed. For example, typing @kbd{t}
-during execution switches to trace mode at the next stop point. You can
-use @kbd{S} to stop execution without doing anything else.
+then executes the command you typed. For example, typing @kbd{t} during
+execution switches to trace mode at the next stop point. You can use
+@kbd{S} to stop execution without doing anything else.
If your function happens to read input, a character you type intending
to interrupt execution may be read by the function instead. You can
@@ -362,17 +357,17 @@ move point there, and then type @kbd{f}.
The @kbd{o} command continues ``out of'' an expression. It places a
temporary breakpoint at the end of the sexp containing point. If the
-containing sexp is a function definition itself, it continues until just
-before the last sexp in the definition. If that is where you are now,
-it returns from the function and then stops. In other words, this
+containing sexp is a function definition itself, @kbd{o} continues until
+just before the last sexp in the definition. If that is where you are
+now, it returns from the function and then stops. In other words, this
command does not exit the currently executing function unless you are
positioned after the last sexp.
The @kbd{i} command steps into the function or macro called by the list
-form after point. Note that the form need not be the one about to be
-evaluated. But if the form is a function call about to be evaluated,
-remember to use this command before any of the arguments are evaluated,
-since otherwise it will be too late.
+form after point, and stops at its first stop point. Note that the form
+need not be the one about to be evaluated. But if the form is a
+function call about to be evaluated, remember to use this command before
+any of the arguments are evaluated, since otherwise it will be too late.
The @kbd{i} command instruments the function or macro it's supposed to
step into, if it isn't instrumented already. This is convenient, but keep
@@ -418,7 +413,7 @@ The backtrace buffer is killed automatically when you continue
execution.
@end table
->From the Edebug recursive edit, you may invoke commands that activate
+From the Edebug recursive edit, you may invoke commands that activate
Edebug again recursively. Any time Edebug is active, you can quit to
the top level with @kbd{q} or abort one recursive edit level with
@kbd{C-]}. You can display a backtrace of all the
@@ -485,9 +480,10 @@ Edebug always stops or pauses at a breakpoint except when the Edebug
mode is Go-nonstop. In that mode, it ignores breakpoints entirely.
To find out where your breakpoints are, use the @kbd{B} command, which
-moves point to the next breakpoint in the definition following point, or
-to the first breakpoint if there are no following breakpoints. This
-command does not continue execution---it just moves point in the buffer.
+moves point to the next breakpoint following point, within the same
+function, or to the first breakpoint if there are no following
+breakpoints. This command does not continue execution---it just moves
+point in the buffer.
@menu
* Global Break Condition:: Breaking on an event.
@@ -561,31 +557,24 @@ occurred. For an unbound variable error, the last known stop point
might be quite distant from the offending variable reference. In that
case you might want to display a full backtrace (@pxref{Edebug Misc}).
+@c Edebug should be changed for the following: -- dan
If you change @code{debug-on-error} or @code{debug-on-quit} while
Edebug is active, these changes will be forgotten when Edebug becomes
inactive. Furthermore, during Edebug's recursive edit, these variables
are bound to the values they had outside of Edebug.
-@ignore @c I don't want to document something that works only partly -- rms.
-Edebug can also trap signals even if they are handled. If
-@code{debug-on-error} is a list of signal names, Edebug will stop when
-any of these errors are signaled. Edebug shows you the last known stop
-point just as for unhandled errors. After you continue execution, the
-error is signaled again (but without being caught by Edebug). Edebug
-can only trap errors that are handled if they are signaled in Lisp code
-(not subroutines) since it does so by temporarily replacing the
-@code{signal} function.
-@end ignore
-
@node Edebug Views
@subsection Edebug Views
These Edebug commands let you view aspects of the buffer and window
-status that obtained before entry to Edebug.
+status that obtained before entry to Edebug. The outside window
+configuration is the collection of windows and contents that were in
+effect outside of Edebug.
@table @kbd
@item v
-View the outside window configuration (@code{edebug-view-outside}).
+Temporarily view the outside window configuration
+(@code{edebug-view-outside}).
@item p
Temporarily display the outside current buffer with point at its outside
@@ -599,18 +588,13 @@ displaying the same buffer, that window will be used instead to display
the current definition in the future.
@item W
-Forget the saved outside window configuration---so that the current
-window configuration will remain unchanged when you next exit Edebug (by
-continuing the program). Also toggle the @code{edebug-save-windows}
-variable.
-@ignore @c This text is implementation-oriented and doesn't emphasize
- what users really want to know.
-Toggle the @code{edebug-save-windows} variable which indicates whether
-the outside window configuration is saved and restored
-(@code{edebug-toggle-save-windows}). Also, each time it is toggled on,
-make the outside window configuration the same as the current window
-configuration.
-@end ignore
+@c Its function is not simply to forget the saved configuration -- dan
+Toggle whether Edebug saves and restores the outside window
+configuration (@code{edebug-toggle-save-windows}).
+
+With a prefix argument, @code{W} only toggles saving and restoring of
+the selected window. To specify a window that is not displaying the
+source code buffer, you must use @kbd{C-x X W} from the global keymap.
@end table
You can view the outside window configuration with @kbd{v} or just
@@ -618,18 +602,13 @@ bounce to the point in the current buffer with @kbd{p}, even if
it is not normally displayed. After moving point, you may wish to jump
back to the stop point with @kbd{w} from a source code buffer.
-@ignore I don't understand this -- rms
-If you type @kbd{W} twice, Edebug continues saving and restoring an
-outside window configuration, but updates it to match the current
-configuration. You can use this to add another buffer to be displayed
-whenever Edebug is active. However, the automatic redisplay of
-@samp{*edebug*} and @samp{*edebug-trace*} may conflict with the buffers
-you wish to see unless you have enough windows open.
-
-With a prefix argument, @code{W} only toggles saving and restoring of
-the selected window. To specify a window that is not displaying the
-source code buffer, you must use @kbd{C-x X W} from the global keymap.
-@end ignore
+Each time you use @kbd{W} to turn saving @emph{off}, Edebug forgets the
+saved outside window configuration---so that even if you turn saving
+back @emph{on}, the current window configuration remains unchanged when
+you next exit Edebug (by continuing the program). However, the
+automatic redisplay of @samp{*edebug*} and @samp{*edebug-trace*} may
+conflict with the buffers you wish to see unless you have enough windows
+open.
@node Edebug Eval
@subsection Evaluation
@@ -690,7 +669,7 @@ Evaluate the expression before point, in the context outside of Edebug
(@code{edebug-eval-last-sexp}).
@item C-c C-u
-Build a new evaluation list from contents of the buffer
+Build a new evaluation list from the contents of the buffer
(@code{edebug-update-eval-list}).
@item C-c C-d
@@ -717,17 +696,18 @@ more Lisp expressions. Groups are separated by comment lines.
The command @kbd{C-c C-u} (@code{edebug-update-eval-list}) rebuilds the
evaluation list, scanning the buffer and using the first expression of
-each group.
+each group. (The idea is that the second expression of the group is the
+value previously computed and displayed.)
Be careful not to add expressions that execute instrumented code since
that would cause an infinite loop.
@c There ought to be a way to fix this.
-Redisplaying the evaluation list works by inserting each expression in
-the buffer, followed by its current value. It also inserts comment
-lines so that each expression becomes its own group. Thus, if you type
-@kbd{C-c C-u} again without changing the buffer text, the evaluation
-list is effectively unchanged.
+Each entry to Edebug redisplays the evaluation list by inserting each
+expression in the buffer, followed by its current value. It also
+inserts comment lines so that each expression becomes its own group.
+Thus, if you type @kbd{C-c C-u} again without changing the buffer text,
+the evaluation list is effectively unchanged.
If an error occurs during an evaluation from the evaluation list, the
error message is displayed in a string as if it were the result.
@@ -817,7 +797,7 @@ for details.
@subsection Trace Buffer
@cindex trace buffer
- Edebug can record an execution trace in a buffer named
+ Edebug can record an execution trace, storing it in a buffer named
@samp{*edebug-trace*}. This is a log of function calls and returns,
showing the function names and their arguments and values. To enable
trace recording, set @code{edebug-trace} to a non-@code{nil} value.
@@ -851,7 +831,7 @@ to put in the trace buffer. All the arguments are evaluated.
@defun edebug-trace format-string &rest format-args
This function inserts text in the trace buffer. It computes the text
with @code{(apply 'format @var{format-string} @var{format-args})}.
-It also inserts a newline to separate entries.
+It also appends a newline to separate entries.
@end defun
@code{edebug-tracing} and @code{edebug-trace} insert lines in the trace
@@ -860,11 +840,6 @@ buffer even if Edebug is not active.
Adding text to the trace buffer also scrolls its window to show the
last lines inserted.
-@ignore @c too vague
-There may be some display problems if you use
-tracing along with the evaluation list.
-@end ignore
-
@node Coverage Testing
@subsection Coverage Testing
@@ -883,9 +858,9 @@ displays both the frequency data and the coverage data (if recorded).
This command displays the frequency count data for each line of the
current definition.
-The frequency counts appear comment lines after each line of code, and
+The frequency counts appear as comment lines after each line of code, and
you can undo all insertions with one @code{undo} command. The counts
-are appear under the @kbd{(} before an expression or the @kbd{)} after
+appear under the @kbd{(} before an expression or the @kbd{)} after
an expression, or on the last character of a symbol. Values do not appear if
they are equal to the previous count on the same line.
@@ -913,10 +888,10 @@ the breakpoint is reached, the frequency data looks like this:
;# 0
@end example
-The comment lines show that @code{fac} has been called 6 times. The
-first @code{if} statement has returned 5 times with the same result each
+The comment lines show that @code{fac} was called 6 times. The
+first @code{if} statement returned 5 times with the same result each
time; the same is true of the condition on the second @code{if}.
-The recursive call of @code{fac} has not returned at all.
+The recursive call of @code{fac} did not return at all.
@node The Outside Context
@@ -929,10 +904,6 @@ buffer, by temporarily restoring the outside context. This section
explains precisely what context Edebug restores, and how Edebug fails to
be completely transparent.
-@c This can be fixed and should be
-The same mechanism that avoids masking certain variable's outside values
-also currently makes it impossible to set these variables within Edebug.
-
@menu
* Checking Whether to Stop:: When Edebug decides what to do.
* Edebug Display Update:: When Edebug updates the display.
@@ -942,8 +913,9 @@ also currently makes it impossible to set these variables within Edebug.
@node Checking Whether to Stop
@subsubsection Checking Whether to Stop
-Whenever Edebug is entered just to think about whether to take some
-action, it needs to save and restore certain data.
+Whenever Edebug is entered, it needs to save and restore certain data
+before even deciding whether to make trace information or stop the
+program.
@itemize @bullet
@item
@@ -962,11 +934,12 @@ Edebug is active, @code{executing-macro} is bound to
@node Edebug Display Update
@subsubsection Edebug Display Update
+@c This paragraph is not filled, because LaLiberte's conversion script
+@c needs an xref to be on just one line.
When Edebug needs to display something (e.g., in trace mode), it saves
-the current window configuration from ``outside'' Edebug (@pxref{Window
-Configurations,,, elisp, GNU Emacs Lisp Reference Manual}). When
-you exit Edebug (by continuing the program), it restores the previous
-window configuration.
+the current window configuration from ``outside'' Edebug
+(@pxref{Window Configurations}). When you exit Edebug (by continuing
+the program), it restores the previous window configuration.
Emacs redisplays only when it pauses. Usually, when you continue
execution, the program comes back into Edebug at a breakpoint or after
@@ -1000,7 +973,6 @@ The window start and horizontal scrolling of the source code buffer are
not restored, however, so that the display remains coherent within Edebug.
@item
-@vindex edebug-save-displayed-buffer-points
The value of point in each displayed buffer is saved and restored if
@code{edebug-save-displayed-buffer-points} is non-@code{nil}.
@@ -1035,6 +1007,11 @@ The key sequence returned by @code{this-command-keys} is changed by
executing commands within Edebug and there is no way to reset
the key sequence from Lisp.
+Edebug cannot save and restore the value of
+@code{unread-command-events}. Entering Edebug while this variable has a
+nontrivial value can interfere with execution of the program you are
+debugging.
+
@item
Complex commands executed while in Edebug are added to the variable
@code{command-history}. In rare cases this can alter execution.
@@ -1064,7 +1041,7 @@ way to tell which subexpressions of the macro call are forms to be
evaluated. (Evaluation may occur explicitly in the macro body, or when
the resulting expansion is evaluated, or any time later.) You must
explain the format of calls to each macro to enable Edebug to handle it.
-To do this, use @code{def-edebug-form-spec} to define the format of
+To do this, use @code{def-edebug-spec} to define the format of
calls to a given macro.
@deffn Macro def-edebug-spec macro specification
@@ -1114,7 +1091,6 @@ described in the following sections.
@menu
* Specification List:: How to specify complex patterns of evaluation.
* Backtracking:: What Edebug does when matching fails.
-@c * Debugging Backquote:: Debugging Backquote
* Specification Examples:: To help understand specifications.
@end menu
@@ -1150,7 +1126,9 @@ their meanings:
@table @code
@item sexp
-A single unevaluated Lisp object object.
+A single Lisp object, not unevaluated.
+@c "unevaluated expression" is not meaningful, because
+@c an expression is a Lisp object intended for evaluation.
@item form
A single evaluated expression, which is instrumented.
@@ -1246,16 +1224,8 @@ Otherwise, the symbol should be a predicate. The predicate is called
with the argument and the specification fails if the predicate returns
@code{nil}. In either case, that argument is not instrumented.
-@findex keywordp
-@findex lambda-list-keywordp
Some suitable predicates include @code{symbolp}, @code{integerp},
@code{stringp}, @code{vectorp}, and @code{atom}.
-@ignore
-, @code{keywordp}, and
-@code{lambda-list-keywordp}. The last two, defined in @file{edebug.el},
-test whether the argument is a symbol starting with @samp{@code{:}} and
-@samp{@code{&}} respectively.
-@end ignore
@item [@var{elements}@dots{}]
@cindex [@dots{}] (Edebug)
@@ -1267,12 +1237,6 @@ The argument should be a symbol named @var{string}. This specification
is equivalent to the quoted symbol, @code{'@var{symbol}}, where the name
of @var{symbol} is the @var{string}, but the string form is preferred.
-@ignore
-@item '@var{symbol} @r{or} (quote @var{symbol})
-The argument should be the symbol @var{symbol}. But use a string
-specification instead.
-@end ignore
-
@item (vector @var{elements}@dots{})
The argument should be a vector whose elements must match the
@var{elements} in the specification. See the backquote example below.
@@ -1291,9 +1255,9 @@ This is useful in recursive specifications such as in the backquote
example below. Also see the description of a @code{nil} specification
above for terminating such recursion.
-Note that a sublist specification of the form @code{(specs . nil)}
-means the same as @code{(specs)}, and @code{(specs .
-(sublist-elements@dots{}))} means the same as @code{(specs
+Note that a sublist specification written as @code{(specs . nil)}
+is equivalent to @code{(specs)}, and @code{(specs .
+(sublist-elements@dots{}))} is equivalent to @code{(specs
sublist-elements@dots{})}.
@end table
@@ -1319,12 +1283,11 @@ than once.
@item arg
The argument, a symbol, is the name of an argument of the defining form.
However, lambda list keywords (symbols starting with @samp{@code{&}})
-are not allowed. See @code{lambda-list} and the example below.
+are not allowed.
@item lambda-list
@cindex lambda-list (Edebug)
This matches a lambda list---the argument list of a lambda expression.
-The argument should be a list of symbols.
@item def-body
The argument is the body of code in a definition. This is like
@@ -1380,94 +1343,6 @@ Third, backtracking may be explicitly disabled by using the
@code{gate} specification. This is useful when you know that
no higher alternatives may apply.
-@ignore
-@node Debugging Backquote
-@subsubsection Debugging Backquote
-
-@findex ` (Edebug)
-@cindex backquote (Edebug)
-Backquote (@kbd{`}) is a macro that results in an expression that may or
-may not be evaluated. It is often used to simplify the definition of a
-macro to return an expression to be evaluated, but Edebug cannot know
-whether the resyult of backquote will be used in any other way.
-
-The forms inside unquotes (@code{,} and @code{,@@}) are evaluated, and
-Edebug instruments them.
-
-Edebug supports nested backquotes, but there is a limit on the support
-of quotes inside of backquotes. Forms quoted with @code{'} are not
-normally evaluated, but if the quoted form appears immediately within
-@code{,} and @code{,@@} forms, Edebug treats this as a backquoted form
-at the next higher level (even if there is not a next higher level; this
-is difficult to fix).
-
-@findex edebug-`
-If the backquoted forms are code to be evaluated, you can have Edebug
-instrument them by using @code{edebug-`} instead of the regular
-@code{`}. Unquoting forms can be used inside @code{edebug-`} anywhere a
-form is normally allowed. But @code{(, @var{form})} may be used in two
-other places specially recognized by Edebug: wherever a predicate
-specification would match, and at the head of a list form where the
-function name normally appears. The @var{form} inside a spliced
-unquote, @code{(,@@ @var{form})}, will be instrumented, but the unquote
-form itself will not be instrumented since this would interfere with the
-splicing.
-
-There is one other complication with using @code{edebug-`}. If the
-@code{edebug-`} call is in a macro and the macro may be called from code
-that is also instrumented, and if unquoted forms contain any macro
-arguments bound to instrumented forms, then you should modify the
-specification for the macro as follows: the specifications for those
-arguments must use @code{def-form} instead of @code{form}. (This is to
-reestablish the Edebugging context for those external forms.)
-
-For example, the @code{for} macro (@pxref{Problems with Macros,,, elisp,
-Emacs Lisp Reference Manual}) is shown here but with @code{edebug-`}
-substituted for regular @code{`}.
-
-@example
-(defmacro inc (var)
- (list 'setq var (list '1+ var)))
-
-(defmacro for (var from init to final do &rest body)
- (let ((tempvar (make-symbol "max")))
- (edebug-` (let (((, var) (, init))
- ((, tempvar) (, final)))
- (while (<= (, var) (, tempvar))
- (,@ body)
- (inc (, var)))))))
-@end example
-
-Here is the corresponding modified Edebug specification and a
-call of the macro:
-
-@example
-(def-edebug-spec for
- (symbolp "from" def-form "to" def-form "do" &rest def-form))
-
-(let ((n 5))
- (for i from n to (* n (+ n 1)) do
- (message "%s" i)))
-@end example
-
-After instrumenting the @code{for} macro and the macro call, Edebug
-first steps to the beginning of the macro call, then into the macro
-body, then through each of the unquoted expressions in the backquote
-showing the expressions that will be embedded. Then when the macro
-expansion is evaluated, Edebug will step through the @code{let} form and
-each time it gets to an unquoted form, it will jump back to an argument
-of the macro call to step through that expression. Finally stepping
-will continue after the macro call. Even more convoluted execution
-paths may result when using anonymous functions.
-
-@vindex edebug-unwrap-results
-When the result of an expression is an instrumented expression, it is
-difficult to see the expression inside the instrumentation. So
-you may want to set the option @code{edebug-unwrap-results} to a
-non-@code{nil} value while debugging such expressions, but it would slow
-Edebug down to always do this.
-
-@end ignore
@node Specification Examples
@subsubsection Specification Examples
@@ -1492,11 +1367,11 @@ specifications. It is necessary to handle interactive forms specially
since an expression argument it is actually evaluated outside of the
function body.
-@example
-(def-edebug-spec defmacro defun) ; @r{Indirect ref to @code{defun} spec}
+@smallexample
+(def-edebug-spec defmacro defun) ; @r{Indirect ref to @code{defun} spec.}
(def-edebug-spec defun
(&define name lambda-list
- [&optional stringp] ; @r{Match the doc string, if present.}
+ [&optional stringp] ; @r{Match the doc string, if present.}
[&optional ("interactive" interactive)]
def-body))
@@ -1508,7 +1383,7 @@ function body.
(def-edebug-spec interactive
(&optional &or stringp def-form)) ; @r{Notice: @code{def-form}}
-@end example
+@end smallexample
The specification for backquote below illustrates how to match
dotted lists and use @code{nil} to terminate recursion. It also
@@ -1516,15 +1391,15 @@ illustrates how components of a vector may be matched. (The actual
specification defined by Edebug does not support dotted lists because
doing so causes very deep recursion that could fail.)
-@example
-(def-edebug-spec ` (backquote-form)) ;; alias just for clarity
+@smallexample
+(def-edebug-spec ` (backquote-form)) ; @r{Alias just for clarity.}
(def-edebug-spec backquote-form
(&or ([&or "," ",@@"] &or ("quote" backquote-form) form)
(backquote-form . [&or nil backquote-form])
(vector &rest backquote-form)
sexp))
-@end example
+@end smallexample
@node Edebug Options
@@ -1544,18 +1419,21 @@ but only when you also use Edebug.
@defopt edebug-all-defs
If this is non-@code{nil}, normal evaluation of defining forms such as
@code{defun} and @code{defmacro} instruments them for Edebug. This
-applies to @code{eval-defun}, @code{eval-region}, and
-@code{eval-current-buffer}. @xref{Instrumenting}.
+applies to @code{eval-defun}, @code{eval-region}, @code{eval-buffer},
+and @code{eval-current-buffer}.
+
+Use the command @kbd{M-x edebug-all-defs} to toggle the value of this
+option. @xref{Instrumenting}.
@end defopt
@defopt edebug-all-forms
-If this is non-@code{nil}, the commands @code{eval-defun}, @code{eval-region},
-and @code{eval-current-buffer} instrument all forms, even those that
-don't define anything.
+If this is non-@code{nil}, the commands @code{eval-defun},
+@code{eval-region}, @code{eval-buffer}, and @code{eval-current-buffer}
+instrument all forms, even those that don't define anything.
+This doesn't apply to loading or evaluations in the minibuffer.
Use the command @kbd{M-x edebug-all-forms} to toggle the value of this
-option.
-@xref{Instrumenting}.
+option. @xref{Instrumenting}.
@end defopt
@defopt edebug-save-windows
@@ -1572,12 +1450,13 @@ interactively. @xref{Edebug Display Update}.
@end defopt
@defopt edebug-save-displayed-buffer-points
-If non-@code{nil}, Edebug saves and restores point in all buffers.
+If this is non-@code{nil}, Edebug saves and restores point in all
+displayed buffers.
Saving and restoring point in other buffers is necessary if you are
debugging code that changes the point of a buffer which is displayed in
a non-selected window. If Edebug or the user then selects the window,
-the buffer's point will change to the window's point.
+point in that buffer will move to the window's value of point.
Saving and restoring point in all buffers is expensive, since it
requires selecting each window twice, so enable this only if you need
@@ -1603,8 +1482,7 @@ function entry or exit per line, indented by the recursion level.
The default value is @code{nil}.
-Also see @code{edebug-tracing}.
-@xref{Tracing}.
+Also see @code{edebug-tracing}, in @xref{Trace Buffer}.
@end defopt
@defopt edebug-test-coverage
@@ -1657,20 +1535,12 @@ Errors}.
If you change the values of @code{edebug-on-error} or
@code{edebug-on-quit} while Edebug is active, their values won't be used
-until the @emph{next} time Edebug is invoked at a deeper command level.
-
-@ignore
-@defopt edebug-unwrap-results
-Non-@code{nil} if Edebug should unwrap results of expressions. This is
-useful when debugging macros where the results of expressions are
-instrumented expressions. But don't do this when results might be
-circular, or an infinite loop will result. @xref{Debugging Backquote}.
-@end defopt
-@end ignore
+until the @emph{next} time Edebug is invoked via a new command.
+@c Not necessarily a deeper command level.
+@c A new command is not precisely true, but that is close enough -- dan
@defopt edebug-global-break-condition
If non-@code{nil}, an expression to test for at every stop point.
If the result is non-nil, then break. Errors are ignored.
@xref{Global Break Condition}.
@end defopt
-
diff --git a/lispref/keymaps.texi b/lispref/keymaps.texi
index 298397e55ac..02bada65bce 100644
--- a/lispref/keymaps.texi
+++ b/lispref/keymaps.texi
@@ -21,7 +21,6 @@ is found. The whole process is called @dfn{key lookup}.
* Inheritance and Keymaps:: How one keymap can inherit the bindings
of another keymap.
* Prefix Keys:: Defining a key with a keymap as its definition.
-* Menu Keymaps:: A keymap can define a menu.
* Active Keymaps:: Each buffer has a local keymap
to override the standard (global) bindings.
A minor mode can also override them.
@@ -30,6 +29,7 @@ is found. The whole process is called @dfn{key lookup}.
* Changing Key Bindings:: Redefining a key in a keymap.
* Key Binding Commands:: Interactive interfaces for redefining keys.
* Scanning Keymaps:: Looking through all keymaps, for printing help.
+* Menu Keymaps:: A keymap can define a menu.
@end menu
@node Keymap Terminology
@@ -62,7 +62,7 @@ used up.
If the binding of a key sequence is a keymap, we call the key sequence
a @dfn{prefix key}. Otherwise, we call it a @dfn{complete key} (because
-no more characters can be added to it). If the binding is @code{nil},
+no more events can be added to it). If the binding is @code{nil},
we call the key @dfn{undefined}. Examples of prefix keys are @kbd{C-c},
@kbd{C-x}, and @kbd{C-x 4}. Examples of defined complete keys are
@kbd{X}, @key{RET}, and @kbd{C-x 4 C-f}. Examples of undefined complete
@@ -87,7 +87,7 @@ prefix keys for its well-formedness.
use for finding key bindings. These are the @dfn{global map}, which is
shared by all buffers; the @dfn{local keymap}, which is usually
associated with a specific major mode; and zero or more @dfn{minor mode
-keymaps} which belong to currently enabled minor modes. (Not all minor
+keymaps}, which belong to currently enabled minor modes. (Not all minor
modes have keymaps.) The local keymap bindings shadow (i.e., take
precedence over) the corresponding global bindings. The minor mode
keymaps shadow both local and global keymaps. @xref{Active Keymaps},
@@ -105,11 +105,13 @@ remaining elements of the list define the key bindings of the keymap.
Use the function @code{keymapp} (see below) to test whether an object is
a keymap.
- An ordinary element is a cons cell of the form @code{(@var{type} .@:
-@var{binding})}. This specifies one binding which applies to events of
-type @var{type}. Each ordinary binding applies to events of a
-particular @dfn{event type}, which is always a character or a symbol.
-@xref{Classifying Events}.
+ Each ordinary binding applies to events of a particular @dfn{event
+type}, which is always a character or a symbol. @xref{Classifying
+Events}.
+
+ An ordinary element of a keymap is a cons cell of the form
+@code{(@var{type} .@: @var{binding})}. This specifies one binding, for
+events of type @var{type}.
@cindex default key binding
@c Emacs 19 feature
@@ -122,7 +124,7 @@ keymap.
If an element of a keymap is a vector, the vector counts as bindings
for all the @sc{ASCII} characters; vector element @var{n} is the binding
-for the character with code @var{n}. This is a more compact way to
+for the character with code @var{n}. This is a compact way to
record lots of bindings. A keymap with such a vector is called a
@dfn{full keymap}. Other keymaps are called @dfn{sparse keymaps}.
@@ -184,7 +186,7 @@ lisp-mode-map
@defun keymapp object
This function returns @code{t} if @var{object} is a keymap, @code{nil}
-otherwise. Practically speaking, this function tests for a list whose
+otherwise. More precisely, this function tests for a list whose
@sc{car} is @code{keymap}.
@example
@@ -206,8 +208,8 @@ otherwise. Practically speaking, this function tests for a list whose
Here we describe the functions for creating keymaps.
@defun make-keymap &optional prompt
-This function creates and returns a new full keymap (i.e., one which
-contains a vector of length 128 for defining all the @sc{ASCII}
+This function creates and returns a new full keymap (i.e., one
+containing a vector of length 128 for defining all the @sc{ASCII}
characters). The new keymap initially binds all @sc{ASCII} characters
to @code{nil}, and does not bind any other kind of event.
@@ -237,7 +239,7 @@ specifies a prompt string, as in @code{make-keymap}.
@end defun
@defun copy-keymap keymap
-This function returns a copy of @var{keymap}. Any keymaps which
+This function returns a copy of @var{keymap}. Any keymaps that
appear directly as bindings in @var{keymap} are also copied recursively,
and so on to any number of levels. However, recursive copying does not
take place when the definition of a character is a symbol whose function
@@ -303,9 +305,9 @@ from @code{text-mode-map}:
@section Prefix Keys
@cindex prefix key
- A @dfn{prefix key} has an associated keymap which defines what to do
+ A @dfn{prefix key} has an associated keymap that defines what to do
with key sequences that start with the prefix key. For example,
-@kbd{C-x} is a prefix key, and it uses a keymap which is also stored in
+@kbd{C-x} is a prefix key, and it uses a keymap that is also stored in
the variable @code{ctl-x-map}. Here is a list of the standard prefix
keys of Emacs and their keymaps:
@@ -333,9 +335,8 @@ describes the main use of the @kbd{C-c} prefix key.
@cindex @kbd{C-x}
@vindex ctl-x-map
@findex Control-X-prefix
-@code{ctl-x-map} is the variable name for the map used for events
-that follow @kbd{C-x}. This map is also the function definition of
-@code{Control-X-prefix}.
+@code{ctl-x-map} is the map used for events that follow @kbd{C-x}. This
+map is also the function definition of @code{Control-X-prefix}.
@item
@cindex @kbd{C-x 4}
@@ -346,7 +347,7 @@ that follow @kbd{C-x}. This map is also the function definition of
@item
@cindex @kbd{C-x 5}
@vindex ctl-x-5-map
-@code{ctl-x-5-map} used is for events that follow @kbd{C-x 5}.
+@code{ctl-x-5-map} is used for events that follow @kbd{C-x 5}.
@c Emacs 19 feature
@item
@@ -365,9 +366,9 @@ the symbol @code{Control-X-prefix}, whose function definition is the
keymap for @kbd{C-x} commands. (The same keymap is also the value of
@code{ctl-x-map}.)
- Prefix key definitions of this sort can appear in any active keymap.
-The definitions of @kbd{C-c}, @kbd{C-x}, @kbd{C-h} and @key{ESC} as
-prefix keys appear in the global map, so these prefix keys are always
+ Prefix key definitions can appear in any active keymap. The
+definitions of @kbd{C-c}, @kbd{C-x}, @kbd{C-h} and @key{ESC} as prefix
+keys appear in the global map, so these prefix keys are always
available. Major and minor modes can redefine a key as a prefix by
putting a prefix key definition for it in the local map or the minor
mode's map. @xref{Active Keymaps}.
@@ -405,313 +406,16 @@ active keymap.
@defun define-prefix-command symbol
@cindex prefix command
- This function defines @var{symbol} as a prefix command: it creates a
+This function defines @var{symbol} as a prefix command: it creates a
full keymap and stores it as @var{symbol}'s function definition.
Storing the symbol as the binding of a key makes the key a prefix key
-which has a name. It also sets @var{symbol} as a variable, to have the
-keymap as its value. The function returns @var{symbol}.
+that has a name. The function also sets @var{symbol} as a variable, to
+have the keymap as its value. It returns @var{symbol}.
In Emacs version 18, only the function definition of @var{symbol} was
set, not the value as a variable.
@end defun
-@node Menu Keymaps
-@section Menu Keymaps
-@cindex menu keymaps
-
-@c Emacs 19 feature
-A keymap can define a menu as well as bindings for keyboard keys and
-mouse button. Menus are usually actuated with the mouse, but they can
-work with the keyboard also.
-
-@menu
-* Defining Menus:: How to make a keymap that defines a menu.
-* Mouse Menus:: How users actuate the menu with the mouse.
-* Keyboard Menus:: How they actuate it with the keyboard.
-* Menu Example:: Making a simple menu.
-* Menu Bar:: How to customize the menu bar.
-* Modifying Menus:: How to add new items to a menu.
-@end menu
-
-@node Defining Menus
-@subsection Defining Menus
-@cindex defining menus
-@cindex menu prompt string
-@cindex prompt string (of menu)
-
-A keymap is suitable for menu use if it has an @dfn{overall prompt
-string}, which is a string that appears as an element of the keymap.
-(@xref{Format of Keymaps}.) The string should describe the purpose of
-the menu. The easiest way to construct a keymap with a prompt string is
-to specify the string as an argument when you call @code{make-keymap} or
-@code{make-sparse-keymap} (@pxref{Creating Keymaps}).
-
-The individual bindings in the menu keymap should have item
-strings; these strings become the items displayed in the menu. A
-binding with a item string looks like this:
-
-@example
-(@var{string} . @var{real-binding})
-@end example
-
-The item string for a binding should be short---one or two words. It
-should describe the action of the command it corresponds to.
-
-As far as @code{define-key} is concerned, @var{string} is part of the
-event's binding. However, @code{lookup-key} returns just
-@var{real-binding}, and only @var{real-binding} is used for executing
-the key.
-
-You can also supply a second string, called the help string, as follows:
-
-@example
-(@var{string} @var{help-string} . @var{real-binding})
-@end example
-
-Currently Emacs does not actually use @var{help-string}; it knows only
-how to ignore @var{help-string} in order to extract @var{real-binding}.
-In the future we hope to make @var{help-string} serve as extended
-documentation for the menu item, available on request.
-
-If @var{real-binding} is @code{nil}, then @var{string} appears in the
-menu but cannot be selected.
-
-If @var{real-binding} is a symbol, and has a non-@code{nil}
-@code{menu-enable} property, that property is an expression which
-controls whether the menu item is enabled. Every time the keymap is
-used to display a menu, Emacs evaluates the expression, and it enables
-the menu item only if the expression's value is non-@code{nil}. When a
-menu item is disabled, it is displayed in a ``fuzzy'' fashion, and
-cannot be selected with the mouse.
-
-The order of items in the menu is the same as the order of bindings in
-the keymap. Since @code{define-key} puts new bindings at the front, you
-should define the menu items starting at the bottom of the menu and
-moving to the top, if you care about the order. When you add an item to
-an existing menu, you can specify its position in the menu using
-@code{define-key-after} (@pxref{Modifying Menus}).
-
-You've probably noticed that menu items show the equivalent keyboard key
-sequence (if any) to invoke the same command. To save time on
-recalculation, menu display caches this information in a sublist in the
-binding, like this:
-
-@c This line is not too long--rms.
-@example
-(@var{string} @r{[}@var{help-string}@r{]} (@var{key-binding-data}) . @var{real-binding})
-@end example
-
-Don't put these sublists in the menu item yourself; menu display
-calculates them automatically. Don't add keyboard equivalents to the
-item string yourself, for that is redundant.
-
-@node Mouse Menus
-@subsection Menus and the Mouse
-
-The way to make a menu keymap produce a menu is to make it the
-definition of a prefix key.
-
-If the prefix key ends with a mouse event, Emacs handles the menu keymap
-by popping up a visible menu, so that the user can select a choice with
-the mouse. When the user clicks on a menu item, the event generated is
-whatever character or symbol has the binding which brought about that
-menu item. (A menu item may generate a series of events if the menu has
-multiple levels or comes from the menu bar.)
-
-It's often best to use a button-down event to trigger the menu. Then
-the user can select a menu item by releasing the button.
-
-A single keymap can appear as multiple menu panes, if you explicitly
-arrange for this. The way to do this is to make a keymap for each pane,
-then create a binding for each of those maps in the main keymap of the
-menu. Give each of these bindings a item string that starts with
-@samp{@@}. The rest of the item string becomes the name of the pane.
-See the file @file{lisp/mouse.el} for an example of this. Any ordinary
-bindings with @samp{@@}-less item strings are grouped into one pane,
-which appears along with the other panes explicitly created for the
-submaps.
-
-X toolkit menus don't have panes; instead, they can have submenus.
-Every nested keymap becomes a submenu, whether the item string starts
-with @samp{@@} or not. In a toolkit version of Emacs, The only thing
-special about @samp{@@} at the beginning of an item string is that the
-@samp{@@} doesn't appear in the menu item.
-
-You can also get multiple panes from separate keymaps. The full
-definition of a prefix key always comes from merging the definitions
-supplied by the various active keymaps (minor mode, local, and
-global). When more than one of these keymaps is a menu, each of them
-makes a separate pane or panes. @xref{Active Keymaps}.
-
-In toolkit versions of Emacs, menus don't have panes, so submenus are
-used to represent the separate keymaps. Each keymap's contribution
-becomes one submenu.
-
-A Lisp program can explicitly pop up a menu and receive the user's
-choice. You can use keymaps for this also. @xref{Pop-Up Menus}.
-
-@node Keyboard Menus
-@subsection Menus and the Keyboard
-
-When a prefix key ending with a keyboard event (a character or function
-key) has a definition that is a menu keymap, the user can use the
-keyboard to choose a menu item.
-
-Emacs displays the menu alternatives (the item strings of the
-bindings) in the echo area. If they don't all fit at once, the user can
-type @key{SPC} to see the next line of alternatives. Successive uses of
-@key{SPC} eventually get to the end of the menu and then cycle around to
-the beginning.
-
-When the user has found the desired alternative from the menu, he or she
-should type the corresponding character---the one whose binding is that
-alternative.
-
-In a menu intended for keyboard use, each menu item must clearly
-indicate what character to type. The best convention to use is to make
-the character the first letter of the item string. That is something
-users will understand without being told.
-
-This way of using menus in an Emacs-like editor was inspired by the
-Hierarkey system.
-
-@defvar menu-prompt-more-char
-This variable specifies the character to use to ask to see
-the next line of a menu. Its initial value is 32, the code
-for @key{SPC}.
-@end defvar
-
-@node Menu Example
-@subsection Menu Example
-
- Here is a simple example of how to set up a menu for mouse use.
-
-@example
-(defvar my-menu-map
- (make-sparse-keymap "Key Commands <==> Functions"))
-(fset 'help-for-keys my-menu-map)
-
-(define-key my-menu-map [bindings]
- '("List all keystroke commands" . describe-bindings))
-(define-key my-menu-map [key]
- '("Describe key briefly" . describe-key-briefly))
-(define-key my-menu-map [key-verbose]
- '("Describe key verbose" . describe-key))
-(define-key my-menu-map [function]
- '("Describe Lisp function" . describe-function))
-(define-key my-menu-map [where-is]
- '("Where is this command" . where-is))
-
-(define-key global-map [C-S-down-mouse-1] 'help-for-keys)
-@end example
-
- The symbols used in the key sequences bound in the menu are fictitious
-``function keys''; they don't appear on the keyboard, but that doesn't
-stop you from using them in the menu. Their names were chosen to be
-mnemonic, because they show up in the output of @code{where-is} and
-@code{apropos} to identify the corresponding menu items.
-
- However, if you want the menu to be usable from the keyboard as well,
-you must bind real @sc{ASCII} characters as well as fictitious function
-keys.
-
-@node Menu Bar
-@subsection The Menu Bar
-@cindex menu bar
-
- Most window systems allow each frame to have a @dfn{menu bar}---a
-permanently displayed menu stretching horizontally across the top of the
-frame. The items of the menu bar are the subcommands of the fake
-``function key'' @code{menu-bar}, as defined by all the active keymaps.
-
- To add an item to the menu bar, invent a fake ``function key'' of your
-own (let's call it @var{key}), and make a binding for the key sequence
-@code{[menu-bar @var{key}]}. Most often, the binding is a menu keymap,
-so that pressing a button on the menu bar item leads to another menu.
-
- When more than one active keymap defines the same fake function key
-for the menu bar, the item appears just once. If the user clicks on
-that menu bar item, it brings up a single, combined submenu containing
-all the subcommands of that item---the global subcommands, the local
-subcommands, and the minor mode subcommands, all together.
-
- In order for a frame to display a menu bar, its @code{menu-bar-lines}
-parameter must be greater than zero. Emacs uses just one line for the
-menu bar itself; if you specify more than one line, the other lines
-serve to separate the menu bar from the windows in the frame. We
-recommend you try 1 or 2 as the value of @code{menu-bar-lines}. @xref{X
-Frame Parameters}.
-
- Here's an example of setting up a menu bar item:
-
-@smallexample
-(modify-frame-parameters (selected-frame) '((menu-bar-lines . 2)))
-
-;; @r{Make a menu keymap (with a prompt string)}
-;; @r{and make it the menu bar item's definition.}
-(define-key global-map [menu-bar words]
- (cons "Words" (make-sparse-keymap "Words")))
-
-@group
-;; @r{Define specific subcommands in the item's menu.}
-(define-key global-map
- [menu-bar words forward]
- '("Forward word" . forward-word))
-@end group
-@group
-(define-key global-map
- [menu-bar words backward]
- '("Backward word" . backward-word))
-@end group
-@end smallexample
-
- A local keymap can cancel a menu bar item made by the global keymap by
-rebinding the same fake function key with @code{undefined} as the
-binding. For example, this is how Dired suppresses the @samp{Edit} menu
-bar item:
-
-@example
-(define-key dired-mode-map [menu-bar edit] 'undefined)
-@end example
-
-@noindent
-@code{edit} is the fake function key used by the global map for the
-@samp{Edit} menu bar item. The main reason to suppress a global
-menu bar item is to regain space for mode-specific items.
-
-@defvar menu-bar-final-items
-Normally the menu bar shows global items followed by items defined by the
-local maps.
-
-This variable holds a list of fake function keys for items to display at
-the end of the menu bar rather than in normal sequence. The default
-value is @code{(help)}; thus, the @samp{Help} menu item normally appears
-at the end of the menu bar, following local menu items.
-@end defvar
-
-@node Modifying Menus
-@subsection Modifying Menus
-
- When you insert a new item in an existing menu, you probably want to
-put it in a particular place among the menu's existing items. If you
-use @code{define-key} to add the item, it normally goes at the front of
-the menu. To put it elsewhere, use @code{define-key-after}:
-
-@defun define-key-after map key binding after
-Define a binding in @var{map} for @var{key}, with value @var{binding},
-just like @code{define-key}, but position the binding in @var{map} after
-the binding for the key @var{after}. For example,
-
-@example
-(define-key-after my-menu [drink]
- '("Drink" . drink-command) [eat])
-@end example
-
-@noindent
-makes a binding for the fake function key @key{drink} and puts it
-right after the binding for @key{eat}.
-@end defun
-
@node Active Keymaps
@section Active Keymaps
@cindex active keymap
@@ -756,10 +460,9 @@ map.
@cindex major mode keymap
Since every buffer that uses the same major mode normally uses the
-very same local keymap, it may appear as if the keymap is local to the
-mode. A change to the local keymap of a buffer (using
-@code{local-set-key}, for example) will be seen also in the other
-buffers that share that keymap.
+same local keymap, you can think of the keymap as local to the mode. A
+change to the local keymap of a buffer (using @code{local-set-key}, for
+example) is seen also in the other buffers that share that keymap.
The local keymaps that are used for Lisp mode, C mode, and several
other major modes exist even if they have not yet been used. These
@@ -774,7 +477,7 @@ and exit commands. @xref{Intro to Minibuffers}.
@xref{Standard Keymaps}, for a list of standard keymaps.
@defvar global-map
- This variable contains the default global keymap that maps Emacs
+This variable contains the default global keymap that maps Emacs
keyboard input to commands. The global keymap is normally this keymap.
The default global keymap is a full keymap that binds
@code{self-insert-command} to all of the printing characters.
@@ -785,7 +488,7 @@ out with.
@end defvar
@defun current-global-map
- This function returns the current global keymap. This is the
+This function returns the current global keymap. This is the
same as the value of @code{global-map} unless you change one or the
other.
@@ -799,7 +502,7 @@ other.
@end defun
@defun current-local-map
- This function returns the current buffer's local keymap, or @code{nil}
+This function returns the current buffer's local keymap, or @code{nil}
if it has none. In the following example, the keymap for the
@samp{*scratch*} buffer (using Lisp Interaction mode) is a sparse keymap
in which the entry for @key{ESC}, @sc{ASCII} code 27, is another sparse
@@ -826,14 +529,14 @@ This function returns a list of the keymaps of currently enabled minor modes.
@end defun
@defun use-global-map keymap
- This function makes @var{keymap} the new current global keymap. It
+This function makes @var{keymap} the new current global keymap. It
returns @code{nil}.
- It is very unusual to change the global keymap.
+It is very unusual to change the global keymap.
@end defun
@defun use-local-map keymap
- This function makes @var{keymap} the new local keymap of the current
+This function makes @var{keymap} the new local keymap of the current
buffer. If @var{keymap} is @code{nil}, then the buffer has no local
keymap. @code{use-local-map} returns @code{nil}. Most major mode
commands use this function.
@@ -850,7 +553,7 @@ like this:
@end example
The keymap @var{keymap} is active whenever @var{variable} has a
-non-@code{nil} value. Typically @var{variable} is the variable which
+non-@code{nil} value. Typically @var{variable} is the variable that
enables or disables a minor mode. @xref{Keymaps and Minor Modes}.
Note that elements of @code{minor-mode-map-alist} do not have the same
@@ -873,10 +576,10 @@ minor modes.
@end defvar
@defvar overriding-local-map
-If non-@code{nil}, a keymap to use instead of the buffer's local keymap
-and instead of all the minor mode keymaps. This keymap, if any,
-overrides all other maps that would have been active, except for the
-current global map.
+If non-@code{nil}, this variable holds a keymap to use instead of the
+buffer's local keymap and instead of all the minor mode keymaps. This
+keymap, if any, overrides all other maps that would have been active,
+except for the current global map.
@end defvar
@node Key Lookup
@@ -888,7 +591,7 @@ current global map.
sequence from a given keymap. Actual execution of the binding is not
part of key lookup.
- Key lookup uses just the event types of each event in the key
+ Key lookup uses just the event type of each event in the key
sequence; the rest of the event is ignored. In fact, a key sequence
used for key lookup may designate mouse events with just their types
(symbols) instead of with entire mouse events (lists). @xref{Input
@@ -930,7 +633,7 @@ event of the key sequence is looked up in @var{keymap}.
@item @var{command}
@cindex command in keymap
The events used so far in the lookup form a complete key,
-and @var{command} is its binding.
+and @var{command} is its binding. @xref{What Is a Function}.
@item @var{string}
@itemx @var{vector}
@@ -975,16 +678,16 @@ binding of @kbd{Meta-@key{SPC}}, whatever that may be.''
@cindex symbol in keymap
The function definition of @var{symbol} is used in place of
@var{symbol}. If that too is a symbol, then this process is repeated,
-any number of times. Ultimately this should lead to an object which is
+any number of times. Ultimately this should lead to an object that is
a keymap, a command or a keyboard macro. A list is allowed if it is a
keymap or a command, but indirect entries are not understood when found
via symbols.
Note that keymaps and keyboard macros (strings and vectors) are not
-valid functions, so a symbol with a keymap, string or vector as its
-function definition is also invalid as a function. It is, however,
-valid as a key binding. If the definition is a keyboard macro, then the
-symbol is also valid as an argument to @code{command-execute}
+valid functions, so a symbol with a keymap, string, or vector as its
+function definition is invalid as a function. It is, however, valid as
+a key binding. If the definition is a keyboard macro, then the symbol
+is also valid as an argument to @code{command-execute}
(@pxref{Interactive Call}).
@cindex @code{undefined} in keymap
@@ -1007,7 +710,7 @@ binding is not executable as a command.
@end table
In short, a keymap entry may be a keymap, a command, a keyboard macro,
-a symbol which leads to one of them, or an indirection or @code{nil}.
+a symbol that leads to one of them, or an indirection or @code{nil}.
Here is an example of a sparse keymap with two characters bound to
commands and one bound to another keymap. This map is the normal value
of @code{emacs-lisp-mode-map}. Note that 9 is the code for @key{TAB},
@@ -1039,7 +742,8 @@ If @var{accept-defaults} is non-@code{nil}, then @code{lookup-key}
considers default bindings as well as bindings for the specific events
in @var{key}. Otherwise, @code{lookup-key} reports only bindings for
the specific sequence @var{key}, ignoring default bindings except when
-an element of @var{key} is @code{t}.
+you explicitly ask about them. (To do this, supply @code{t} as an
+element of @var{key}; see @ref{Format of Keymaps}.)
All the other functions described in this chapter that look up keys use
@code{lookup-key}.
@@ -1090,7 +794,7 @@ keymaps, trying all the active keymaps. The result is @code{nil} if
@c Emacs 19 feature
The argument @var{accept-defaults} controls checking for default
-bindings, as in @code{lookup-key}.
+bindings, as in @code{lookup-key} (above).
An error is signaled if @var{key} is not a string or a vector.
@@ -1124,8 +828,8 @@ as in @code{lookup-key} (above).
@defun minor-mode-key-binding key &optional accept-defaults
This function returns a list of all the active minor mode bindings of
@var{key}. More precisely, it returns an alist of pairs
-@code{(@var{modename} . @var{binding})}, where @var{modename} is the the
-variable which enables the minor mode, and @var{binding} is @var{key}'s
+@code{(@var{modename} . @var{binding})}, where @var{modename} is the
+variable that enables the minor mode, and @var{binding} is @var{key}'s
binding in that mode. If @var{key} has no minor-mode bindings, the
value is @code{nil}.
@@ -1187,48 +891,27 @@ meta-prefix-char ; @r{The default value.}
@cindex rebinding
The way to rebind a key is to change its entry in a keymap. If you
-change the global keymap, the change is effective in all buffers (except
-those that override the global binding with a local one). If you change
-the current buffer's local map, that usually affects all buffers using
-the same major mode. The @code{global-set-key} and @code{local-set-key}
-functions are convenient interfaces for these operations. Or you can
-use @code{define-key} and specify explicitly which map to change.
-
- People often use @code{global-set-key} in their @file{.emacs} file for
-simple customization. For example,
-
-@smallexample
-(global-set-key "\C-x\C-\\" 'next-line)
-@end smallexample
-
-@noindent
-or
-
-@smallexample
-(global-set-key [?\C-x ?\C-\\] 'next-line)
-@end smallexample
-
-@noindent
-redefines @kbd{C-x C-\} to move down a line.
-
-@smallexample
-(global-set-key [M-mouse-1] 'mouse-set-point)
-@end smallexample
-
-@noindent
-redefines the first (leftmost) mouse button, typed with the Meta key, to
-set point where you click.
+change a binding in the global keymap, the change is effective in all
+buffers (though it has no direct effect in buffers that shadow the
+global binding with a local one). If you change the current buffer's
+local map, that usually affects all buffers using the same major mode.
+The @code{global-set-key} and @code{local-set-key} functions are
+convenient interfaces for these operations (@pxref{Key Binding
+Commands}). You can also use @code{define-key}, a more general
+function; then you must specify explicitly the map to change.
@cindex meta character key constants
@cindex control character key constants
- In writing the key sequence to rebind, it is useful to use the special
+ In writing the key sequence to rebind, it is good to use the special
escape sequences for control and meta characters (@pxref{String Type}).
The syntax @samp{\C-} means that the following character is a control
character and @samp{\M-} means that the following character is a meta
character. Thus, the string @code{"\M-x"} is read as containing a
single @kbd{M-x}, @code{"\C-f"} is read as containing a single
@kbd{C-f}, and @code{"\M-\C-x"} and @code{"\C-\M-x"} are both read as
-containing a single @kbd{C-M-x}.
+containing a single @kbd{C-M-x}. You can also use this escape syntax in
+vectors, as well as others that aren't allowed in strings; one example
+is @samp{[?\C-\H-x home]}. @xref{Character Type}.
For the functions below, an error is signaled if @var{keymap} is not a
keymap or if @var{key} is not a string or vector representing a key
@@ -1236,7 +919,7 @@ sequence. You can use event types (symbols) as shorthand for events
that are lists.
@defun define-key keymap key binding
- This function sets the binding for @var{key} in @var{keymap}. (If
+This function sets the binding for @var{key} in @var{keymap}. (If
@var{key} is more than one event long, the change is actually made
in another keymap reached from @var{keymap}.) The argument
@var{binding} can be any Lisp object, but only certain types are
@@ -1245,7 +928,7 @@ The value returned by @code{define-key} is @var{binding}.
@cindex invalid prefix key error
@cindex key sequence error
- Every prefix of @var{key} must be a prefix key (i.e., bound to a
+Every prefix of @var{key} must be a prefix key (i.e., bound to a
keymap) or undefined; otherwise an error is signaled.
If some prefix of @var{key} is undefined, then @code{define-key} defines
@@ -1253,7 +936,8 @@ it as a prefix key so that the rest of @var{key} may be defined as
specified.
@end defun
- This example creates a sparse keymap and makes a number of bindings:
+ Here is an example that creates a sparse keymap and makes a number of
+bindings in it:
@smallexample
@group
@@ -1425,8 +1109,33 @@ Dired mode is set up:
This section describes some convenient interactive interfaces for
changing key bindings. They work by calling @code{define-key}.
+ People often use @code{global-set-key} in their @file{.emacs} file for
+simple customization. For example,
+
+@smallexample
+(global-set-key "\C-x\C-\\" 'next-line)
+@end smallexample
+
+@noindent
+or
+
+@smallexample
+(global-set-key [?\C-x ?\C-\\] 'next-line)
+@end smallexample
+
+@noindent
+redefines @kbd{C-x C-\} to move down a line.
+
+@smallexample
+(global-set-key [M-mouse-1] 'mouse-set-point)
+@end smallexample
+
+@noindent
+redefines the first (leftmost) mouse button, typed with the Meta key, to
+set point where you click.
+
@deffn Command global-set-key key definition
- This function sets the binding of @var{key} in the current global map
+This function sets the binding of @var{key} in the current global map
to @var{definition}.
@smallexample
@@ -1440,11 +1149,11 @@ to @var{definition}.
@deffn Command global-unset-key key
@cindex unbinding keys
- This function removes the binding of @var{key} from the current
+This function removes the binding of @var{key} from the current
global map.
One use of this function is in preparation for defining a longer key
-which uses it implicitly as a prefix---which would not be allowed if
+that uses @var{key} as a prefix---which would not be allowed if
@var{key} has a non-prefix binding. For example:
@smallexample
@@ -1470,7 +1179,7 @@ This function is implemented simply using @code{define-key}:
@end deffn
@deffn Command local-set-key key definition
- This function sets the binding of @var{key} in the current local
+This function sets the binding of @var{key} in the current local
keymap to @var{definition}.
@smallexample
@@ -1483,7 +1192,7 @@ keymap to @var{definition}.
@end deffn
@deffn Command local-unset-key key
- This function removes the binding of @var{key} from the current
+This function removes the binding of @var{key} from the current
local map.
@smallexample
@@ -1543,9 +1252,10 @@ definition is the sparse keymap @code{(keymap (83 .@: center-paragraph)
In the following example, @kbd{C-h} is a prefix key that uses a sparse
keymap starting with @code{(keymap (118 . describe-variable)@dots{})}.
-Another prefix, @kbd{C-x 4}, uses a keymap which happens to be
-@code{ctl-x-4-map}. The event @code{mode-line} is one of several dummy
-events used as prefixes for mouse actions in special parts of a window.
+Another prefix, @kbd{C-x 4}, uses a keymap which is also the value of
+the variable @code{ctl-x-4-map}. The event @code{mode-line} is one of
+several dummy events used as prefixes for mouse actions in special parts
+of a window.
@smallexample
@group
@@ -1601,8 +1311,8 @@ entirely of @sc{ASCII} characters (or meta variants of @sc{ASCII}
characters) are preferred to all other key sequences.
If @var{noindirect} is non-@code{nil}, @code{where-is-internal} doesn't
-follow indirections to other keymaps or slots. This makes it possible
-to search for an indirect definition itself.
+follow indirect keymap bindings. This makes it possible to search for
+an indirect definition itself.
This function is used by @code{where-is} (@pxref{Help, , Help, emacs,
The GNU Emacs Manual}).
@@ -1616,10 +1326,13 @@ The GNU Emacs Manual}).
@end defun
@deffn Command describe-bindings prefix
-This function creates a listing of all defined keys, and their
+This function creates a listing of all defined keys and their
definitions. It writes the listing in a buffer named @samp{*Help*} and
displays it in a window.
+If @var{prefix} is non-@code{nil}, it should be a prefix key; then the
+listing includes only keys that start with @var{prefix}.
+
The listing describes meta characters as @key{ESC} followed by the
corresponding non-meta character.
@@ -1632,7 +1345,319 @@ For example, in the default global map, the characters @samp{@key{SPC}
@kbd{~} is @sc{ASCII} 126, and the characters between them include all
the normal printing characters, (e.g., letters, digits, punctuation,
etc.@:); all these characters are bound to @code{self-insert-command}.
-
-If @var{prefix} is non-@code{nil}, it should be a prefix key; then the
-listing includes only keys that start with @var{prefix}.
@end deffn
+
+@node Menu Keymaps
+@section Menu Keymaps
+@cindex menu keymaps
+
+@c Emacs 19 feature
+A keymap can define a menu as well as bindings for keyboard keys and
+mouse button. Menus are usually actuated with the mouse, but they can
+work with the keyboard also.
+
+@menu
+* Defining Menus:: How to make a keymap that defines a menu.
+* Mouse Menus:: How users actuate the menu with the mouse.
+* Keyboard Menus:: How they actuate it with the keyboard.
+* Menu Example:: Making a simple menu.
+* Menu Bar:: How to customize the menu bar.
+* Modifying Menus:: How to add new items to a menu.
+@end menu
+
+@node Defining Menus
+@subsection Defining Menus
+@cindex defining menus
+@cindex menu prompt string
+@cindex prompt string (of menu)
+
+A keymap is suitable for menu use if it has an @dfn{overall prompt
+string}, which is a string that appears as an element of the keymap.
+(@xref{Format of Keymaps}.) The string should describe the purpose of
+the menu. The easiest way to construct a keymap with a prompt string is
+to specify the string as an argument when you call @code{make-keymap} or
+@code{make-sparse-keymap} (@pxref{Creating Keymaps}).
+
+The individual bindings in the menu keymap should have item
+strings; these strings become the items displayed in the menu. A
+binding with an item string looks like this:
+
+@example
+(@var{string} . @var{real-binding})
+@end example
+
+The item string for a binding should be short---one or two words. It
+should describe the action of the command it corresponds to.
+
+As far as @code{define-key} is concerned, @var{string} is part of the
+event's binding. However, @code{lookup-key} returns just
+@var{real-binding}, and only @var{real-binding} is used for executing
+the key.
+
+You can also supply a second string, called the help string, as follows:
+
+@example
+(@var{string} @var{help-string} . @var{real-binding})
+@end example
+
+Currently Emacs does not actually use @var{help-string}; it knows only
+how to ignore @var{help-string} in order to extract @var{real-binding}.
+In the future we hope to make @var{help-string} serve as extended
+documentation for the menu item, available on request.
+
+If @var{real-binding} is @code{nil}, then @var{string} appears in the
+menu but cannot be selected.
+
+If @var{real-binding} is a symbol and has a non-@code{nil}
+@code{menu-enable} property, that property is an expression that
+controls whether the menu item is enabled. Every time the keymap is
+used to display a menu, Emacs evaluates the expression, and it enables
+the menu item only if the expression's value is non-@code{nil}. When a
+menu item is disabled, it is displayed in a ``fuzzy'' fashion, and
+cannot be selected with the mouse.
+
+The order of items in the menu is the same as the order of bindings in
+the keymap. Since @code{define-key} puts new bindings at the front, you
+should define the menu items starting at the bottom of the menu and
+moving to the top, if you care about the order. When you add an item to
+an existing menu, you can specify its position in the menu using
+@code{define-key-after} (@pxref{Modifying Menus}).
+
+You've probably noticed that menu items show the equivalent keyboard key
+sequence (if any) to invoke the same command. To save time on
+recalculation, menu display caches this information in a sublist in the
+binding, like this:
+
+@c This line is not too long--rms.
+@example
+(@var{string} @r{[}@var{help-string}@r{]} (@var{key-binding-data}) . @var{real-binding})
+@end example
+
+Don't put these sublists in the menu item yourself; menu display
+calculates them automatically. Don't add keyboard equivalents to the
+item strings in a mouse menu, since that is redundant.
+
+@node Mouse Menus
+@subsection Menus and the Mouse
+
+The way to make a menu keymap produce a menu is to make it the
+definition of a prefix key.
+
+If the prefix key ends with a mouse event, Emacs handles the menu keymap
+by popping up a visible menu, so that the user can select a choice with
+the mouse. When the user clicks on a menu item, the event generated is
+whatever character or symbol has the binding that brought about that
+menu item. (A menu item may generate a series of events if the menu has
+multiple levels or comes from the menu bar.)
+
+It's often best to use a button-down event to trigger the menu. Then
+the user can select a menu item by releasing the button.
+
+A single keymap can appear as multiple menu panes, if you explicitly
+arrange for this. The way to do this is to make a keymap for each pane,
+then create a binding for each of those maps in the main keymap of the
+menu. Give each of these bindings an item string that starts with
+@samp{@@}. The rest of the item string becomes the name of the pane.
+See the file @file{lisp/mouse.el} for an example of this. Any ordinary
+bindings with @samp{@@}-less item strings are grouped into one pane,
+which appears along with the other panes explicitly created for the
+submaps.
+
+X toolkit menus don't have panes; instead, they can have submenus.
+Every nested keymap becomes a submenu, whether the item string starts
+with @samp{@@} or not. In a toolkit version of Emacs, the only thing
+special about @samp{@@} at the beginning of an item string is that the
+@samp{@@} doesn't appear in the menu item.
+
+You can also get multiple panes from separate keymaps. The full
+definition of a prefix key always comes from merging the definitions
+supplied by the various active keymaps (minor mode, local, and
+global). When more than one of these keymaps is a menu, each of them
+makes a separate pane or panes. @xref{Active Keymaps}.
+
+In toolkit versions of Emacs, menus don't have panes, so submenus are
+used to represent the separate keymaps. Each keymap's contribution
+becomes one submenu.
+
+A Lisp program can explicitly pop up a menu and receive the user's
+choice. You can use keymaps for this also. @xref{Pop-Up Menus}.
+
+@node Keyboard Menus
+@subsection Menus and the Keyboard
+
+When a prefix key ending with a keyboard event (a character or function
+key) has a definition that is a menu keymap, the user can use the
+keyboard to choose a menu item.
+
+Emacs displays the menu alternatives (the item strings of the bindings)
+in the echo area. If they don't all fit at once, the user can type
+@key{SPC} to see the next line of alternatives. Successive uses of
+@key{SPC} eventually get to the end of the menu and then cycle around to
+the beginning. (The variable @code{menu-prompt-more-char} specifies
+which character is used for this; @key{SPC} is the default.)
+
+When the user has found the desired alternative from the menu, he or she
+should type the corresponding character---the one whose binding is that
+alternative.
+
+In a menu intended for keyboard use, each menu item must clearly
+indicate what character to type. The best convention to use is to make
+the character the first letter of the item string. That is something
+users will understand without being told.
+
+This way of using menus in an Emacs-like editor was inspired by the
+Hierarkey system.
+
+@defvar menu-prompt-more-char
+This variable specifies the character to use to ask to see
+the next line of a menu. Its initial value is 32, the code
+for @key{SPC}.
+@end defvar
+
+@node Menu Example
+@subsection Menu Example
+
+ Here is a simple example of how to set up a menu for mouse use.
+
+@example
+(defvar my-menu-map
+ (make-sparse-keymap "Key Commands <==> Functions"))
+(fset 'help-for-keys my-menu-map)
+
+(define-key my-menu-map [bindings]
+ '("List all keystroke commands" . describe-bindings))
+(define-key my-menu-map [key]
+ '("Describe key briefly" . describe-key-briefly))
+(define-key my-menu-map [key-verbose]
+ '("Describe key verbose" . describe-key))
+(define-key my-menu-map [function]
+ '("Describe Lisp function" . describe-function))
+(define-key my-menu-map [where-is]
+ '("Where is this command" . where-is))
+
+(define-key global-map [C-S-down-mouse-1] 'help-for-keys)
+@end example
+
+ The symbols used in the key sequences bound in the menu are fictitious
+``function keys''; they don't appear on the keyboard, but that doesn't
+stop you from using them in the menu. Their names were chosen to be
+mnemonic, because they show up in the output of @code{where-is} and
+@code{apropos} to identify the corresponding menu items.
+
+ However, if you want the menu to be usable from the keyboard as well,
+you must bind real @sc{ASCII} characters as well as fictitious function
+keys.
+
+@node Menu Bar
+@subsection The Menu Bar
+@cindex menu bar
+
+ Most window systems allow each frame to have a @dfn{menu bar}---a
+permanently displayed menu stretching horizontally across the top of the
+frame. The items of the menu bar are the subcommands of the fake
+``function key'' @code{menu-bar}, as defined by all the active keymaps.
+
+ To add an item to the menu bar, invent a fake ``function key'' of your
+own (let's call it @var{key}), and make a binding for the key sequence
+@code{[menu-bar @var{key}]}. Most often, the binding is a menu keymap,
+so that pressing a button on the menu bar item leads to another menu.
+
+ When more than one active keymap defines the same fake function key
+for the menu bar, the item appears just once. If the user clicks on
+that menu bar item, it brings up a single, combined submenu containing
+all the subcommands of that item---the global subcommands, the local
+subcommands, and the minor mode subcommands, all together.
+
+ In order for a frame to display a menu bar, its @code{menu-bar-lines}
+parameter must be greater than zero. Emacs uses just one line for the
+menu bar itself; if you specify more than one line, the other lines
+serve to separate the menu bar from the windows in the frame. We
+recommend you try 1 or 2 as the value of @code{menu-bar-lines}. @xref{X
+Frame Parameters}.
+
+ Here's an example of setting up a menu bar item:
+
+@example
+@group
+(modify-frame-parameters (selected-frame)
+ '((menu-bar-lines . 2)))
+@end group
+
+@group
+;; @r{Make a menu keymap (with a prompt string)}
+;; @r{and make it the menu bar item's definition.}
+(define-key global-map [menu-bar words]
+ (cons "Words" (make-sparse-keymap "Words")))
+@end group
+
+@group
+;; @r{Define specific subcommands in the item's menu.}
+(define-key global-map
+ [menu-bar words forward]
+ '("Forward word" . forward-word))
+@end group
+@group
+(define-key global-map
+ [menu-bar words backward]
+ '("Backward word" . backward-word))
+@end group
+@end example
+
+ A local keymap can cancel a menu bar item made by the global keymap by
+rebinding the same fake function key with @code{undefined} as the
+binding. For example, this is how Dired suppresses the @samp{Edit} menu
+bar item:
+
+@example
+(define-key dired-mode-map [menu-bar edit] 'undefined)
+@end example
+
+@noindent
+@code{edit} is the fake function key used by the global map for the
+@samp{Edit} menu bar item. The main reason to suppress a global
+menu bar item is to regain space for mode-specific items.
+
+@defvar menu-bar-final-items
+Normally the menu bar shows global items followed by items defined by the
+local maps.
+
+This variable holds a list of fake function keys for items to display at
+the end of the menu bar rather than in normal sequence. The default
+value is @code{(help)}; thus, the @samp{Help} menu item normally appears
+at the end of the menu bar, following local menu items.
+@end defvar
+
+@node Modifying Menus
+@subsection Modifying Menus
+
+ When you insert a new item in an existing menu, you probably want to
+put it in a particular place among the menu's existing items. If you
+use @code{define-key} to add the item, it normally goes at the front of
+the menu. To put it elsewhere, use @code{define-key-after}:
+
+@defun define-key-after map key binding after
+Define a binding in @var{map} for @var{key}, with value @var{binding},
+just like @code{define-key}, but position the binding in @var{map} after
+the binding for the event @var{after}. For example,
+
+@example
+(define-key-after my-menu [drink]
+ '("Drink" . drink-command) 'eat)
+@end example
+
+@noindent
+makes a binding for the fake function key @key{drink} and puts it
+right after the binding for @key{eat}.
+
+Here is how to insert an item called @samp{Work} in the @samp{Signals}
+menu of Shell mode, after the item @code{break}:
+
+@example
+(define-key-after
+ (lookup-key shell-mode-map [menu-bar signals])
+ [work] '("Work" . work-command) 'break)
+@end example
+
+Note that @var{key} is a sequence containing just one event type, but
+@var{after} is just an event type (not a sequence).
+@end defun