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;;; subr.el --- basic lisp subroutines for Emacs -*- lexical-binding:t -*-
;; Copyright (C) 1985-1986, 1992, 1994-1995, 1999-2019 Free Software
;; Foundation, Inc.
;; Maintainer: emacs-devel@gnu.org
;; Keywords: internal
;; Package: emacs
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;; Beware: while this file has tag `utf-8', before it's compiled, it gets
;; loaded as "raw-text", so non-ASCII chars won't work right during bootstrap.
;; declare-function's args use &rest, not &optional, for compatibility
;; with byte-compile-macroexpand-declare-function.
(defmacro declare-function (_fn _file &rest _args)
"Tell the byte-compiler that function FN is defined, in FILE.
The FILE argument is not used by the byte-compiler, but by the
`check-declare' package, which checks that FILE contains a
definition for FN.
FILE can be either a Lisp file (in which case the \".el\"
extension is optional), or a C file. C files are expanded
relative to the Emacs \"src/\" directory. Lisp files are
searched for using `locate-library', and if that fails they are
expanded relative to the location of the file containing the
declaration. A FILE with an \"ext:\" prefix is an external file.
`check-declare' will check such files if they are found, and skip
them without error if they are not.
Optional ARGLIST specifies FN's arguments, or is t to not specify
FN's arguments. An omitted ARGLIST defaults to t, not nil: a nil
ARGLIST specifies an empty argument list, and an explicit t
ARGLIST is a placeholder that allows supplying a later arg.
Optional FILEONLY non-nil means that `check-declare' will check
only that FILE exists, not that it defines FN. This is intended
for function definitions that `check-declare' does not recognize,
e.g., `defstruct'.
Note that for the purposes of `check-declare', this statement
must be the first non-whitespace on a line.
For more information, see Info node `(elisp)Declaring Functions'."
(declare (advertised-calling-convention
(fn file &optional arglist fileonly) nil))
;; Does nothing - byte-compile-declare-function does the work.
nil)
;;;; Basic Lisp macros.
(defalias 'not 'null)
(defalias 'sxhash 'sxhash-equal)
(defmacro noreturn (form)
"Evaluate FORM, expecting it not to return.
If FORM does return, signal an error."
(declare (debug t))
`(prog1 ,form
(error "Form marked with `noreturn' did return")))
(defmacro 1value (form)
"Evaluate FORM, expecting a constant return value.
This is the global do-nothing version. There is also `testcover-1value'
that complains if FORM ever does return differing values."
(declare (debug t))
form)
(defmacro def-edebug-spec (symbol spec)
"Set the `edebug-form-spec' property of SYMBOL according to SPEC.
Both SYMBOL and SPEC are unevaluated. The SPEC can be:
0 (instrument no arguments); t (instrument all arguments);
a symbol (naming a function with an Edebug specification); or a list.
The elements of the list describe the argument types; see
Info node `(elisp)Specification List' for details."
`(put (quote ,symbol) 'edebug-form-spec (quote ,spec)))
(defmacro lambda (&rest cdr)
"Return an anonymous function.
Under dynamic binding, a call of the form (lambda ARGS DOCSTRING
INTERACTIVE BODY) is self-quoting; the result of evaluating the
lambda expression is the expression itself. Under lexical
binding, the result is a closure. Regardless, the result is a
function, i.e., it may be stored as the function value of a
symbol, passed to `funcall' or `mapcar', etc.
ARGS should take the same form as an argument list for a `defun'.
DOCSTRING is an optional documentation string.
If present, it should describe how to call the function.
But documentation strings are usually not useful in nameless functions.
INTERACTIVE should be a call to the function `interactive', which see.
It may also be omitted.
BODY should be a list of Lisp expressions.
\(fn ARGS [DOCSTRING] [INTERACTIVE] BODY)"
(declare (doc-string 2) (indent defun)
(debug (&define lambda-list lambda-doc
[&optional ("interactive" interactive)]
def-body)))
;; Note that this definition should not use backquotes; subr.el should not
;; depend on backquote.el.
(list 'function (cons 'lambda cdr)))
(defmacro setq-local (var val)
"Set variable VAR to value VAL in current buffer."
;; Can't use backquote here, it's too early in the bootstrap.
(declare (debug (symbolp form)))
(list 'set (list 'make-local-variable (list 'quote var)) val))
(defmacro defvar-local (var val &optional docstring)
"Define VAR as a buffer-local variable with default value VAL.
Like `defvar' but additionally marks the variable as being automatically
buffer-local wherever it is set."
(declare (debug defvar) (doc-string 3))
;; Can't use backquote here, it's too early in the bootstrap.
(list 'progn (list 'defvar var val docstring)
(list 'make-variable-buffer-local (list 'quote var))))
(defmacro push (newelt place)
"Add NEWELT to the list stored in the generalized variable PLACE.
This is morally equivalent to (setf PLACE (cons NEWELT PLACE)),
except that PLACE is only evaluated once (after NEWELT)."
(declare (debug (form gv-place)))
(if (symbolp place)
;; Important special case, to avoid triggering GV too early in
;; the bootstrap.
(list 'setq place
(list 'cons newelt place))
(require 'macroexp)
(macroexp-let2 macroexp-copyable-p v newelt
(gv-letplace (getter setter) place
(funcall setter `(cons ,v ,getter))))))
(defmacro pop (place)
"Return the first element of PLACE's value, and remove it from the list.
PLACE must be a generalized variable whose value is a list.
If the value is nil, `pop' returns nil but does not actually
change the list."
(declare (debug (gv-place)))
;; We use `car-safe' here instead of `car' because the behavior is the same
;; (if it's not a cons cell, the `cdr' would have signaled an error already),
;; but `car-safe' is total, so the byte-compiler can safely remove it if the
;; result is not used.
`(car-safe
,(if (symbolp place)
;; So we can use `pop' in the bootstrap before `gv' can be used.
(list 'prog1 place (list 'setq place (list 'cdr place)))
(gv-letplace (getter setter) place
(macroexp-let2 macroexp-copyable-p x getter
`(prog1 ,x ,(funcall setter `(cdr ,x))))))))
(defmacro when (cond &rest body)
"If COND yields non-nil, do BODY, else return nil.
When COND yields non-nil, eval BODY forms sequentially and return
value of last one, or nil if there are none.
\(fn COND BODY...)"
(declare (indent 1) (debug t))
(list 'if cond (cons 'progn body)))
(defmacro unless (cond &rest body)
"If COND yields nil, do BODY, else return nil.
When COND yields nil, eval BODY forms sequentially and return
value of last one, or nil if there are none.
\(fn COND BODY...)"
(declare (indent 1) (debug t))
(cons 'if (cons cond (cons nil body))))
(defmacro dolist (spec &rest body)
"Loop over a list.
Evaluate BODY with VAR bound to each car from LIST, in turn.
Then evaluate RESULT to get return value, default nil.
\(fn (VAR LIST [RESULT]) BODY...)"
(declare (indent 1) (debug ((symbolp form &optional form) body)))
(unless (consp spec)
(signal 'wrong-type-argument (list 'consp spec)))
(unless (<= 2 (length spec) 3)
(signal 'wrong-number-of-arguments (list '(2 . 3) (length spec))))
;; It would be cleaner to create an uninterned symbol,
;; but that uses a lot more space when many functions in many files
;; use dolist.
;; FIXME: This cost disappears in byte-compiled lexical-binding files.
(let ((temp '--dolist-tail--))
;; This is not a reliable test, but it does not matter because both
;; semantics are acceptable, tho one is slightly faster with dynamic
;; scoping and the other is slightly faster (and has cleaner semantics)
;; with lexical scoping.
(if lexical-binding
`(let ((,temp ,(nth 1 spec)))
(while ,temp
(let ((,(car spec) (car ,temp)))
,@body
(setq ,temp (cdr ,temp))))
,@(cdr (cdr spec)))
`(let ((,temp ,(nth 1 spec))
,(car spec))
(while ,temp
(setq ,(car spec) (car ,temp))
,@body
(setq ,temp (cdr ,temp)))
,@(if (cdr (cdr spec))
`((setq ,(car spec) nil) ,@(cdr (cdr spec))))))))
(defmacro dotimes (spec &rest body)
"Loop a certain number of times.
Evaluate BODY with VAR bound to successive integers running from 0,
inclusive, to COUNT, exclusive. Then evaluate RESULT to get
the return value (nil if RESULT is omitted).
\(fn (VAR COUNT [RESULT]) BODY...)"
(declare (indent 1) (debug dolist))
;; It would be cleaner to create an uninterned symbol,
;; but that uses a lot more space when many functions in many files
;; use dotimes.
;; FIXME: This cost disappears in byte-compiled lexical-binding files.
(let ((temp '--dotimes-limit--)
(start 0)
(end (nth 1 spec)))
;; This is not a reliable test, but it does not matter because both
;; semantics are acceptable, tho one is slightly faster with dynamic
;; scoping and the other has cleaner semantics.
(if lexical-binding
(let ((counter '--dotimes-counter--))
`(let ((,temp ,end)
(,counter ,start))
(while (< ,counter ,temp)
(let ((,(car spec) ,counter))
,@body)
(setq ,counter (1+ ,counter)))
,@(if (cddr spec)
;; FIXME: This let often leads to "unused var" warnings.
`((let ((,(car spec) ,counter)) ,@(cddr spec))))))
`(let ((,temp ,end)
(,(car spec) ,start))
(while (< ,(car spec) ,temp)
,@body
(setq ,(car spec) (1+ ,(car spec))))
,@(cdr (cdr spec))))))
(defmacro declare (&rest _specs)
"Do not evaluate any arguments, and return nil.
If a `declare' form appears as the first form in the body of a
`defun' or `defmacro' form, SPECS specifies various additional
information about the function or macro; these go into effect
during the evaluation of the `defun' or `defmacro' form.
The possible values of SPECS are specified by
`defun-declarations-alist' and `macro-declarations-alist'.
For more information, see info node `(elisp)Declare Form'."
;; FIXME: edebug spec should pay attention to defun-declarations-alist.
nil)
(defmacro ignore-errors (&rest body)
"Execute BODY; if an error occurs, return nil.
Otherwise, return result of last form in BODY.
See also `with-demoted-errors' that does something similar
without silencing all errors."
(declare (debug t) (indent 0))
`(condition-case nil (progn ,@body) (error nil)))
;;;; Basic Lisp functions.
(defvar gensym-counter 0
"Number used to construct the name of the next symbol created by `gensym'.")
(defun gensym (&optional prefix)
"Return a new uninterned symbol.
The name is made by appending `gensym-counter' to PREFIX.
PREFIX is a string, and defaults to \"g\"."
(let ((num (prog1 gensym-counter
(setq gensym-counter (1+ gensym-counter)))))
(make-symbol (format "%s%d" (or prefix "g") num))))
(defun ignore (&rest _ignore)
"Do nothing and return nil.
This function accepts any number of arguments, but ignores them."
(interactive)
nil)
;; Signal a compile-error if the first arg is missing.
(defun error (&rest args)
"Signal an error, making a message by passing args to `format-message'.
In Emacs, the convention is that error messages start with a capital
letter but *do not* end with a period. Please follow this convention
for the sake of consistency.
Note: (error \"%s\" VALUE) makes the message VALUE without
interpreting format characters like `%', `\\=`', and `\\=''."
(declare (advertised-calling-convention (string &rest args) "23.1"))
(signal 'error (list (apply #'format-message args))))
(defun user-error (format &rest args)
"Signal a pilot error, making a message by passing args to `format-message'.
In Emacs, the convention is that error messages start with a capital
letter but *do not* end with a period. Please follow this convention
for the sake of consistency.
This is just like `error' except that `user-error's are expected to be the
result of an incorrect manipulation on the part of the user, rather than the
result of an actual problem.
Note: (user-error \"%s\" VALUE) makes the message VALUE without
interpreting format characters like `%', `\\=`', and `\\=''."
(signal 'user-error (list (apply #'format-message format args))))
(defun define-error (name message &optional parent)
"Define NAME as a new error signal.
MESSAGE is a string that will be output to the echo area if such an error
is signaled without being caught by a `condition-case'.
PARENT is either a signal or a list of signals from which it inherits.
Defaults to `error'."
(unless parent (setq parent 'error))
(let ((conditions
(if (consp parent)
(apply #'append
(mapcar (lambda (parent)
(cons parent
(or (get parent 'error-conditions)
(error "Unknown signal `%s'" parent))))
parent))
(cons parent (get parent 'error-conditions)))))
(put name 'error-conditions
(delete-dups (copy-sequence (cons name conditions))))
(when message (put name 'error-message message))))
;; We put this here instead of in frame.el so that it's defined even on
;; systems where frame.el isn't loaded.
(defun frame-configuration-p (object)
"Return non-nil if OBJECT seems to be a frame configuration.
Any list whose car is `frame-configuration' is assumed to be a frame
configuration."
(and (consp object)
(eq (car object) 'frame-configuration)))
(defun apply-partially (fun &rest args)
"Return a function that is a partial application of FUN to ARGS.
ARGS is a list of the first N arguments to pass to FUN.
The result is a new function which does the same as FUN, except that
the first N arguments are fixed at the values with which this function
was called."
(lambda (&rest args2)
(apply fun (append args args2))))
;;;; List functions.
;; Note: `internal--compiler-macro-cXXr' was copied from
;; `cl--compiler-macro-cXXr' in cl-macs.el. If you amend either one,
;; you may want to amend the other, too.
(defun internal--compiler-macro-cXXr (form x)
(let* ((head (car form))
(n (symbol-name (car form)))
(i (- (length n) 2)))
(if (not (string-match "c[ad]+r\\'" n))
(if (and (fboundp head) (symbolp (symbol-function head)))
(internal--compiler-macro-cXXr (cons (symbol-function head) (cdr form))
x)
(error "Compiler macro for cXXr applied to non-cXXr form"))
(while (> i (match-beginning 0))
(setq x (list (if (eq (aref n i) ?a) 'car 'cdr) x))
(setq i (1- i)))
x)))
(defun caar (x)
"Return the car of the car of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (car x)))
(defun cadr (x)
"Return the car of the cdr of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (cdr x)))
(defun cdar (x)
"Return the cdr of the car of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (car x)))
(defun cddr (x)
"Return the cdr of the cdr of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (cdr x)))
(defun caaar (x)
"Return the `car' of the `car' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (car (car x))))
(defun caadr (x)
"Return the `car' of the `car' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (car (cdr x))))
(defun cadar (x)
"Return the `car' of the `cdr' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (cdr (car x))))
(defun caddr (x)
"Return the `car' of the `cdr' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (cdr (cdr x))))
(defun cdaar (x)
"Return the `cdr' of the `car' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (car (car x))))
(defun cdadr (x)
"Return the `cdr' of the `car' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (car (cdr x))))
(defun cddar (x)
"Return the `cdr' of the `cdr' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (cdr (car x))))
(defun cdddr (x)
"Return the `cdr' of the `cdr' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (cdr (cdr x))))
(defun caaaar (x)
"Return the `car' of the `car' of the `car' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (car (car (car x)))))
(defun caaadr (x)
"Return the `car' of the `car' of the `car' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (car (car (cdr x)))))
(defun caadar (x)
"Return the `car' of the `car' of the `cdr' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (car (cdr (car x)))))
(defun caaddr (x)
"Return the `car' of the `car' of the `cdr' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (car (cdr (cdr x)))))
(defun cadaar (x)
"Return the `car' of the `cdr' of the `car' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (cdr (car (car x)))))
(defun cadadr (x)
"Return the `car' of the `cdr' of the `car' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (cdr (car (cdr x)))))
(defun caddar (x)
"Return the `car' of the `cdr' of the `cdr' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (cdr (cdr (car x)))))
(defun cadddr (x)
"Return the `car' of the `cdr' of the `cdr' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(car (cdr (cdr (cdr x)))))
(defun cdaaar (x)
"Return the `cdr' of the `car' of the `car' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (car (car (car x)))))
(defun cdaadr (x)
"Return the `cdr' of the `car' of the `car' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (car (car (cdr x)))))
(defun cdadar (x)
"Return the `cdr' of the `car' of the `cdr' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (car (cdr (car x)))))
(defun cdaddr (x)
"Return the `cdr' of the `car' of the `cdr' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (car (cdr (cdr x)))))
(defun cddaar (x)
"Return the `cdr' of the `cdr' of the `car' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (cdr (car (car x)))))
(defun cddadr (x)
"Return the `cdr' of the `cdr' of the `car' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (cdr (car (cdr x)))))
(defun cdddar (x)
"Return the `cdr' of the `cdr' of the `cdr' of the `car' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (cdr (cdr (car x)))))
(defun cddddr (x)
"Return the `cdr' of the `cdr' of the `cdr' of the `cdr' of X."
(declare (compiler-macro internal--compiler-macro-cXXr))
(cdr (cdr (cdr (cdr x)))))
(defun last (list &optional n)
"Return the last link of LIST. Its car is the last element.
If LIST is nil, return nil.
If N is non-nil, return the Nth-to-last link of LIST.
If N is bigger than the length of LIST, return LIST."
(if n
(and (>= n 0)
(let ((m (safe-length list)))
(if (< n m) (nthcdr (- m n) list) list)))
(and list
(nthcdr (1- (safe-length list)) list))))
(defun butlast (list &optional n)
"Return a copy of LIST with the last N elements removed.
If N is omitted or nil, the last element is removed from the
copy."
(if (and n (<= n 0)) list
(nbutlast (copy-sequence list) n)))
(defun nbutlast (list &optional n)
"Modifies LIST to remove the last N elements.
If N is omitted or nil, remove the last element."
(let ((m (length list)))
(or n (setq n 1))
(and (< n m)
(progn
(if (> n 0) (setcdr (nthcdr (- (1- m) n) list) nil))
list))))
(defun zerop (number)
"Return t if NUMBER is zero."
;; Used to be in C, but it's pointless since (= 0 n) is faster anyway because
;; = has a byte-code.
(declare (compiler-macro (lambda (_) `(= 0 ,number))))
(= 0 number))
(defun delete-dups (list)
"Destructively remove `equal' duplicates from LIST.
Store the result in LIST and return it. LIST must be a proper list.
Of several `equal' occurrences of an element in LIST, the first
one is kept."
(let ((l (length list)))
(if (> l 100)
(let ((hash (make-hash-table :test #'equal :size l))
(tail list) retail)
(puthash (car list) t hash)
(while (setq retail (cdr tail))
(let ((elt (car retail)))
(if (gethash elt hash)
(setcdr tail (cdr retail))
(puthash elt t hash)
(setq tail retail)))))
(let ((tail list))
(while tail
(setcdr tail (delete (car tail) (cdr tail)))
(setq tail (cdr tail))))))
list)
;; See https://lists.gnu.org/r/emacs-devel/2013-05/msg00204.html
(defun delete-consecutive-dups (list &optional circular)
"Destructively remove `equal' consecutive duplicates from LIST.
First and last elements are considered consecutive if CIRCULAR is
non-nil."
(let ((tail list) last)
(while (cdr tail)
(if (equal (car tail) (cadr tail))
(setcdr tail (cddr tail))
(setq last tail
tail (cdr tail))))
(if (and circular
last
(equal (car tail) (car list)))
(setcdr last nil)))
list)
(defun number-sequence (from &optional to inc)
"Return a sequence of numbers from FROM to TO (both inclusive) as a list.
INC is the increment used between numbers in the sequence and defaults to 1.
So, the Nth element of the list is (+ FROM (* N INC)) where N counts from
zero. TO is only included if there is an N for which TO = FROM + N * INC.
If TO is nil or numerically equal to FROM, return (FROM).
If INC is positive and TO is less than FROM, or INC is negative
and TO is larger than FROM, return nil.
If INC is zero and TO is neither nil nor numerically equal to
FROM, signal an error.
This function is primarily designed for integer arguments.
Nevertheless, FROM, TO and INC can be integer or float. However,
floating point arithmetic is inexact. For instance, depending on
the machine, it may quite well happen that
\(number-sequence 0.4 0.6 0.2) returns the one element list (0.4),
whereas (number-sequence 0.4 0.8 0.2) returns a list with three
elements. Thus, if some of the arguments are floats and one wants
to make sure that TO is included, one may have to explicitly write
TO as (+ FROM (* N INC)) or use a variable whose value was
computed with this exact expression. Alternatively, you can,
of course, also replace TO with a slightly larger value
\(or a slightly more negative value if INC is negative)."
(if (or (not to) (= from to))
(list from)
(or inc (setq inc 1))
(when (zerop inc) (error "The increment can not be zero"))
(let (seq (n 0) (next from) (last from))
(if (> inc 0)
;; The (>= next last) condition protects against integer
;; overflow in computing NEXT.
(while (and (>= next last) (<= next to))
(setq seq (cons next seq)
n (1+ n)
last next
next (+ from (* n inc))))
(while (and (<= next last) (>= next to))
(setq seq (cons next seq)
n (1+ n)
next (+ from (* n inc)))))
(nreverse seq))))
(defun copy-tree (tree &optional vecp)
"Make a copy of TREE.
If TREE is a cons cell, this recursively copies both its car and its cdr.
Contrast to `copy-sequence', which copies only along the cdrs. With second
argument VECP, this copies vectors as well as conses."
(if (consp tree)
(let (result)
(while (consp tree)
(let ((newcar (car tree)))
(if (or (consp (car tree)) (and vecp (vectorp (car tree))))
(setq newcar (copy-tree (car tree) vecp)))
(push newcar result))
(setq tree (cdr tree)))
(nconc (nreverse result)
(if (and vecp (vectorp tree)) (copy-tree tree vecp) tree)))
(if (and vecp (vectorp tree))
(let ((i (length (setq tree (copy-sequence tree)))))
(while (>= (setq i (1- i)) 0)
(aset tree i (copy-tree (aref tree i) vecp)))
tree)
tree)))
;;;; Various list-search functions.
(defun assoc-default (key alist &optional test default)
"Find object KEY in a pseudo-alist ALIST.
ALIST is a list of conses or objects. Each element
(or the element's car, if it is a cons) is compared with KEY by
calling TEST, with two arguments: (i) the element or its car,
and (ii) KEY.
If that is non-nil, the element matches; then `assoc-default'
returns the element's cdr, if it is a cons, or DEFAULT if the
element is not a cons.
If no element matches, the value is nil.
If TEST is omitted or nil, `equal' is used."
(let (found (tail alist) value)
(while (and tail (not found))
(let ((elt (car tail)))
(when (funcall (or test 'equal) (if (consp elt) (car elt) elt) key)
(setq found t value (if (consp elt) (cdr elt) default))))
(setq tail (cdr tail)))
value))
(defun assoc-ignore-case (key alist)
"Like `assoc', but ignores differences in case and text representation.
KEY must be a string. Upper-case and lower-case letters are treated as equal.
Unibyte strings are converted to multibyte for comparison."
(declare (obsolete assoc-string "22.1"))
(assoc-string key alist t))
(defun assoc-ignore-representation (key alist)
"Like `assoc', but ignores differences in text representation.
KEY must be a string.
Unibyte strings are converted to multibyte for comparison."
(declare (obsolete assoc-string "22.1"))
(assoc-string key alist nil))
(defun member-ignore-case (elt list)
"Like `member', but ignore differences in case and text representation.
ELT must be a string. Upper-case and lower-case letters are treated as equal.
Unibyte strings are converted to multibyte for comparison.
Non-strings in LIST are ignored."
(while (and list
(not (and (stringp (car list))
(eq t (compare-strings elt 0 nil (car list) 0 nil t)))))
(setq list (cdr list)))
list)
(defun assoc-delete-all (key alist)
"Delete from ALIST all elements whose car is `equal' to KEY.
Return the modified alist.
Elements of ALIST that are not conses are ignored."
(while (and (consp (car alist))
(equal (car (car alist)) key))
(setq alist (cdr alist)))
(let ((tail alist) tail-cdr)
(while (setq tail-cdr (cdr tail))
(if (and (consp (car tail-cdr))
(equal (car (car tail-cdr)) key))
(setcdr tail (cdr tail-cdr))
(setq tail tail-cdr))))
alist)
(defun assq-delete-all (key alist)
"Delete from ALIST all elements whose car is `eq' to KEY.
Return the modified alist.
Elements of ALIST that are not conses are ignored."
(while (and (consp (car alist))
(eq (car (car alist)) key))
(setq alist (cdr alist)))
(let ((tail alist) tail-cdr)
(while (setq tail-cdr (cdr tail))
(if (and (consp (car tail-cdr))
(eq (car (car tail-cdr)) key))
(setcdr tail (cdr tail-cdr))
(setq tail tail-cdr))))
alist)
(defun rassq-delete-all (value alist)
"Delete from ALIST all elements whose cdr is `eq' to VALUE.
Return the modified alist.
Elements of ALIST that are not conses are ignored."
(while (and (consp (car alist))
(eq (cdr (car alist)) value))
(setq alist (cdr alist)))
(let ((tail alist) tail-cdr)
(while (setq tail-cdr (cdr tail))
(if (and (consp (car tail-cdr))
(eq (cdr (car tail-cdr)) value))
(setcdr tail (cdr tail-cdr))
(setq tail tail-cdr))))
alist)
(defun alist-get (key alist &optional default remove testfn)
"Find the first element of ALIST whose `car' equals KEY and return its `cdr'.
If KEY is not found in ALIST, return DEFAULT.
Equality with KEY is tested by TESTFN, defaulting to `eq'.
This is a generalized variable suitable for use with `setf'.
When using it to set a value, optional argument REMOVE non-nil
means to remove KEY from ALIST if the new value is `eql' to DEFAULT."
(ignore remove) ;;Silence byte-compiler.
(let ((x (if (not testfn)
(assq key alist)
(assoc key alist testfn))))
(if x (cdr x) default)))
(defun remove (elt seq)
"Return a copy of SEQ with all occurrences of ELT removed.
SEQ must be a list, vector, or string. The comparison is done with `equal'."
(if (nlistp seq)
;; If SEQ isn't a list, there's no need to copy SEQ because
;; `delete' will return a new object.
(delete elt seq)
(delete elt (copy-sequence seq))))
(defun remq (elt list)
"Return LIST with all occurrences of ELT removed.
The comparison is done with `eq'. Contrary to `delq', this does not use
side-effects, and the argument LIST is not modified."
(while (and (eq elt (car list)) (setq list (cdr list))))
(if (memq elt list)
(delq elt (copy-sequence list))
list))
;;;; Keymap support.
(defun kbd (keys)
"Convert KEYS to the internal Emacs key representation.
KEYS should be a string in the format returned by commands such
as `C-h k' (`describe-key').
This is the same format used for saving keyboard macros (see
`edmacro-mode').
For an approximate inverse of this, see `key-description'."
;; Don't use a defalias, since the `pure' property is only true for
;; the calling convention of `kbd'.
(read-kbd-macro keys))
(put 'kbd 'pure t)
(defun undefined ()
"Beep to tell the user this binding is undefined."
(interactive)
(ding)
(if defining-kbd-macro
(error "%s is undefined" (key-description (this-single-command-keys)))
(message "%s is undefined" (key-description (this-single-command-keys))))
(force-mode-line-update)
;; If this is a down-mouse event, don't reset prefix-arg;
;; pass it to the command run by the up event.
(setq prefix-arg
(when (memq 'down (event-modifiers last-command-event))
current-prefix-arg)))
;; Prevent the \{...} documentation construct
;; from mentioning keys that run this command.
(put 'undefined 'suppress-keymap t)
(defun suppress-keymap (map &optional nodigits)
"Make MAP override all normally self-inserting keys to be undefined.
Normally, as an exception, digits and minus-sign are set to make prefix args,
but optional second arg NODIGITS non-nil treats them like other chars."
(define-key map [remap self-insert-command] 'undefined)
(or nodigits
(let (loop)
(define-key map "-" 'negative-argument)
;; Make plain numbers do numeric args.
(setq loop ?0)
(while (<= loop ?9)
(define-key map (char-to-string loop) 'digit-argument)
(setq loop (1+ loop))))))
(defun make-composed-keymap (maps &optional parent)
"Construct a new keymap composed of MAPS and inheriting from PARENT.
When looking up a key in the returned map, the key is looked in each
keymap of MAPS in turn until a binding is found.
If no binding is found in MAPS, the lookup continues in PARENT, if non-nil.
As always with keymap inheritance, a nil binding in MAPS overrides
any corresponding binding in PARENT, but it does not override corresponding
bindings in other keymaps of MAPS.
MAPS can be a list of keymaps or a single keymap.
PARENT if non-nil should be a keymap."
`(keymap
,@(if (keymapp maps) (list maps) maps)
,@parent))
(defun define-key-after (keymap key definition &optional after)
"Add binding in KEYMAP for KEY => DEFINITION, right after AFTER's binding.
This is like `define-key' except that the binding for KEY is placed
just after the binding for the event AFTER, instead of at the beginning
of the map. Note that AFTER must be an event type (like KEY), NOT a command
\(like DEFINITION).
If AFTER is t or omitted, the new binding goes at the end of the keymap.
AFTER should be a single event type--a symbol or a character, not a sequence.
Bindings are always added before any inherited map.
The order of bindings in a keymap only matters when it is used as
a menu, so this function is not useful for non-menu keymaps."
(unless after (setq after t))
(or (keymapp keymap)
(signal 'wrong-type-argument (list 'keymapp keymap)))
(setq key
(if (<= (length key) 1) (aref key 0)
(setq keymap (lookup-key keymap
(apply 'vector
(butlast (mapcar 'identity key)))))
(aref key (1- (length key)))))
(let ((tail keymap) done inserted)
(while (and (not done) tail)
;; Delete any earlier bindings for the same key.
(if (eq (car-safe (car (cdr tail))) key)
(setcdr tail (cdr (cdr tail))))
;; If we hit an included map, go down that one.
(if (keymapp (car tail)) (setq tail (car tail)))
;; When we reach AFTER's binding, insert the new binding after.
;; If we reach an inherited keymap, insert just before that.
;; If we reach the end of this keymap, insert at the end.
(if (or (and (eq (car-safe (car tail)) after)
(not (eq after t)))
(eq (car (cdr tail)) 'keymap)
(null (cdr tail)))
(progn
;; Stop the scan only if we find a parent keymap.
;; Keep going past the inserted element
;; so we can delete any duplications that come later.
(if (eq (car (cdr tail)) 'keymap)
(setq done t))
;; Don't insert more than once.
(or inserted
(setcdr tail (cons (cons key definition) (cdr tail))))
(setq inserted t)))
(setq tail (cdr tail)))))
(defun map-keymap-sorted (function keymap)
"Implement `map-keymap' with sorting.
Don't call this function; it is for internal use only."
(let (list)
(map-keymap (lambda (a b) (push (cons a b) list))
keymap)
(setq list (sort list
(lambda (a b)
(setq a (car a) b (car b))
(if (integerp a)
(if (integerp b) (< a b)
t)
(if (integerp b) t
;; string< also accepts symbols.
(string< a b))))))
(dolist (p list)
(funcall function (car p) (cdr p)))))
(defun keymap--menu-item-binding (val)
"Return the binding part of a menu-item."
(cond
((not (consp val)) val) ;Not a menu-item.
((eq 'menu-item (car val))
(let* ((binding (nth 2 val))
(plist (nthcdr 3 val))
(filter (plist-get plist :filter)))
(if filter (funcall filter binding)
binding)))
((and (consp (cdr val)) (stringp (cadr val)))
(cddr val))
((stringp (car val))
(cdr val))
(t val))) ;Not a menu-item either.
(defun keymap--menu-item-with-binding (item binding)
"Build a menu-item like ITEM but with its binding changed to BINDING."
(cond
((not (consp item)) binding) ;Not a menu-item.
((eq 'menu-item (car item))
(setq item (copy-sequence item))
(let ((tail (nthcdr 2 item)))
(setcar tail binding)
;; Remove any potential filter.
(if (plist-get (cdr tail) :filter)
(setcdr tail (plist-put (cdr tail) :filter nil))))
item)
((and (consp (cdr item)) (stringp (cadr item)))
(cons (car item) (cons (cadr item) binding)))
(t (cons (car item) binding))))
(defun keymap--merge-bindings (val1 val2)
"Merge bindings VAL1 and VAL2."
(let ((map1 (keymap--menu-item-binding val1))
(map2 (keymap--menu-item-binding val2)))
(if (not (and (keymapp map1) (keymapp map2)))
;; There's nothing to merge: val1 takes precedence.
val1
(let ((map (list 'keymap map1 map2))
(item (if (keymapp val1) (if (keymapp val2) nil val2) val1)))
(keymap--menu-item-with-binding item map)))))
(defun keymap-canonicalize (map)
"Return a simpler equivalent keymap.
This resolves inheritance and redefinitions. The returned keymap
should behave identically to a copy of KEYMAP w.r.t `lookup-key'
and use in active keymaps and menus.
Subkeymaps may be modified but are not canonicalized."
;; FIXME: Problem with the difference between a nil binding
;; that hides a binding in an inherited map and a nil binding that's ignored
;; to let some further binding visible. Currently a nil binding hides all.
;; FIXME: we may want to carefully (re)order elements in case they're
;; menu-entries.
(let ((bindings ())
(ranges ())
(prompt (keymap-prompt map)))
(while (keymapp map)
(setq map (map-keymap ;; -internal
(lambda (key item)
(if (consp key)
;; Treat char-ranges specially.
(push (cons key item) ranges)
(push (cons key item) bindings)))
map)))
;; Create the new map.
(setq map (funcall (if ranges 'make-keymap 'make-sparse-keymap) prompt))
(dolist (binding ranges)
;; Treat char-ranges specially. FIXME: need to merge as well.
(define-key map (vector (car binding)) (cdr binding)))
;; Process the bindings starting from the end.
(dolist (binding (prog1 bindings (setq bindings ())))
(let* ((key (car binding))
(oldbind (assq key bindings)))
(push (if (not oldbind)
;; The normal case: no duplicate bindings.
binding
;; This is the second binding for this key.
(setq bindings (delq oldbind bindings))
(cons key (keymap--merge-bindings (cdr binding)
(cdr oldbind))))
bindings)))
(nconc map bindings)))
(put 'keyboard-translate-table 'char-table-extra-slots 0)
(defun keyboard-translate (from to)
"Translate character FROM to TO on the current terminal.
This function creates a `keyboard-translate-table' if necessary
and then modifies one entry in it."
(or (char-table-p keyboard-translate-table)
(setq keyboard-translate-table
(make-char-table 'keyboard-translate-table nil)))
(aset keyboard-translate-table from to))
;;;; Key binding commands.
(defun global-set-key (key command)
"Give KEY a global binding as COMMAND.
COMMAND is the command definition to use; usually it is
a symbol naming an interactively-callable function.
KEY is a key sequence; noninteractively, it is a string or vector
of characters or event types, and non-ASCII characters with codes
above 127 (such as ISO Latin-1) can be included if you use a vector.
Note that if KEY has a local binding in the current buffer,
that local binding will continue to shadow any global binding
that you make with this function."
(interactive
(let* ((menu-prompting nil)
(key (read-key-sequence "Set key globally: ")))
(list key
(read-command (format "Set key %s to command: "
(key-description key))))))
(or (vectorp key) (stringp key)
(signal 'wrong-type-argument (list 'arrayp key)))
(define-key (current-global-map) key command))
(defun local-set-key (key command)
"Give KEY a local binding as COMMAND.
COMMAND is the command definition to use; usually it is
a symbol naming an interactively-callable function.
KEY is a key sequence; noninteractively, it is a string or vector
of characters or event types, and non-ASCII characters with codes
above 127 (such as ISO Latin-1) can be included if you use a vector.
The binding goes in the current buffer's local map, which in most
cases is shared with all other buffers in the same major mode."
(interactive "KSet key locally: \nCSet key %s locally to command: ")
(let ((map (current-local-map)))
(or map
(use-local-map (setq map (make-sparse-keymap))))
(or (vectorp key) (stringp key)
(signal 'wrong-type-argument (list 'arrayp key)))
(define-key map key command)))
(defun global-unset-key (key)
"Remove global binding of KEY.
KEY is a string or vector representing a sequence of keystrokes."
(interactive "kUnset key globally: ")
(global-set-key key nil))
(defun local-unset-key (key)
"Remove local binding of KEY.
KEY is a string or vector representing a sequence of keystrokes."
(interactive "kUnset key locally: ")
(if (current-local-map)
(local-set-key key nil))
nil)
;;;; substitute-key-definition and its subroutines.
(defvar key-substitution-in-progress nil
"Used internally by `substitute-key-definition'.")
(defun substitute-key-definition (olddef newdef keymap &optional oldmap prefix)
"Replace OLDDEF with NEWDEF for any keys in KEYMAP now defined as OLDDEF.
In other words, OLDDEF is replaced with NEWDEF wherever it appears.
Alternatively, if optional fourth argument OLDMAP is specified, we redefine
in KEYMAP as NEWDEF those keys which are defined as OLDDEF in OLDMAP.
If you don't specify OLDMAP, you can usually get the same results
in a cleaner way with command remapping, like this:
(define-key KEYMAP [remap OLDDEF] NEWDEF)
\n(fn OLDDEF NEWDEF KEYMAP &optional OLDMAP)"
;; Don't document PREFIX in the doc string because we don't want to
;; advertise it. It's meant for recursive calls only. Here's its
;; meaning
;; If optional argument PREFIX is specified, it should be a key
;; prefix, a string. Redefined bindings will then be bound to the
;; original key, with PREFIX added at the front.
(or prefix (setq prefix ""))
(let* ((scan (or oldmap keymap))
(prefix1 (vconcat prefix [nil]))
(key-substitution-in-progress
(cons scan key-substitution-in-progress)))
;; Scan OLDMAP, finding each char or event-symbol that
;; has any definition, and act on it with hack-key.
(map-keymap
(lambda (char defn)
(aset prefix1 (length prefix) char)
(substitute-key-definition-key defn olddef newdef prefix1 keymap))
scan)))
(defun substitute-key-definition-key (defn olddef newdef prefix keymap)
(let (inner-def skipped menu-item)
;; Find the actual command name within the binding.
(if (eq (car-safe defn) 'menu-item)
(setq menu-item defn defn (nth 2 defn))
;; Skip past menu-prompt.
(while (stringp (car-safe defn))
(push (pop defn) skipped))
;; Skip past cached key-equivalence data for menu items.
(if (consp (car-safe defn))
(setq defn (cdr defn))))
(if (or (eq defn olddef)
;; Compare with equal if definition is a key sequence.
;; That is useful for operating on function-key-map.
(and (or (stringp defn) (vectorp defn))
(equal defn olddef)))
(define-key keymap prefix
(if menu-item
(let ((copy (copy-sequence menu-item)))
(setcar (nthcdr 2 copy) newdef)
copy)
(nconc (nreverse skipped) newdef)))
;; Look past a symbol that names a keymap.
(setq inner-def
(or (indirect-function defn) defn))
;; For nested keymaps, we use `inner-def' rather than `defn' so as to
;; avoid autoloading a keymap. This is mostly done to preserve the
;; original non-autoloading behavior of pre-map-keymap times.
(if (and (keymapp inner-def)
;; Avoid recursively scanning
;; where KEYMAP does not have a submap.
(let ((elt (lookup-key keymap prefix)))
(or (null elt) (natnump elt) (keymapp elt)))
;; Avoid recursively rescanning keymap being scanned.
(not (memq inner-def key-substitution-in-progress)))
;; If this one isn't being scanned already, scan it now.
(substitute-key-definition olddef newdef keymap inner-def prefix)))))
;;;; The global keymap tree.
;; global-map, esc-map, and ctl-x-map have their values set up in
;; keymap.c; we just give them docstrings here.
(defvar global-map nil
"Default global keymap mapping Emacs keyboard input into commands.
The value is a keymap which is usually (but not necessarily) Emacs's
global map.")
(defvar esc-map nil
"Default keymap for ESC (meta) commands.
The normal global definition of the character ESC indirects to this keymap.")
(defvar ctl-x-map nil
"Default keymap for C-x commands.
The normal global definition of the character C-x indirects to this keymap.")
(defvar ctl-x-4-map (make-sparse-keymap)
"Keymap for subcommands of C-x 4.")
(defalias 'ctl-x-4-prefix ctl-x-4-map)
(define-key ctl-x-map "4" 'ctl-x-4-prefix)
(defvar ctl-x-5-map (make-sparse-keymap)
"Keymap for frame commands.")
(defalias 'ctl-x-5-prefix ctl-x-5-map)
(define-key ctl-x-map "5" 'ctl-x-5-prefix)
;;;; Event manipulation functions.
(defconst listify-key-sequence-1 (logior 128 ?\M-\C-@))
(defun listify-key-sequence (key)
"Convert a key sequence to a list of events."
(if (vectorp key)
(append key nil)
(mapcar (function (lambda (c)
(if (> c 127)
(logxor c listify-key-sequence-1)
c)))
key)))
(defun eventp (obj)
"True if the argument is an event object."
(when obj
(or (integerp obj)
(and (symbolp obj) obj (not (keywordp obj)))
(and (consp obj) (symbolp (car obj))))))
(defun event-modifiers (event)
"Return a list of symbols representing the modifier keys in event EVENT.
The elements of the list may include `meta', `control',
`shift', `hyper', `super', `alt', `click', `double', `triple', `drag',
and `down'.
EVENT may be an event or an event type. If EVENT is a symbol
that has never been used in an event that has been read as input
in the current Emacs session, then this function may fail to include
the `click' modifier."
(let ((type event))
(if (listp type)
(setq type (car type)))
(if (symbolp type)
;; Don't read event-symbol-elements directly since we're not
;; sure the symbol has already been parsed.
(cdr (internal-event-symbol-parse-modifiers type))
(let ((list nil)
(char (logand type (lognot (logior ?\M-\^@ ?\C-\^@ ?\S-\^@
?\H-\^@ ?\s-\^@ ?\A-\^@)))))
(if (not (zerop (logand type ?\M-\^@)))
(push 'meta list))
(if (or (not (zerop (logand type ?\C-\^@)))
(< char 32))
(push 'control list))
(if (or (not (zerop (logand type ?\S-\^@)))
(/= char (downcase char)))
(push 'shift list))
(or (zerop (logand type ?\H-\^@))
(push 'hyper list))
(or (zerop (logand type ?\s-\^@))
(push 'super list))
(or (zerop (logand type ?\A-\^@))
(push 'alt list))
list))))
(defun event-basic-type (event)
"Return the basic type of the given event (all modifiers removed).
The value is a printing character (not upper case) or a symbol.
EVENT may be an event or an event type. If EVENT is a symbol
that has never been used in an event that has been read as input
in the current Emacs session, then this function may return nil."
(if (consp event)
(setq event (car event)))
(if (symbolp event)
(car (get event 'event-symbol-elements))
(let* ((base (logand event (1- ?\A-\^@)))
(uncontrolled (if (< base 32) (logior base 64) base)))
;; There are some numbers that are invalid characters and
;; cause `downcase' to get an error.
(condition-case ()
(downcase uncontrolled)
(error uncontrolled)))))
(defsubst mouse-movement-p (object)
"Return non-nil if OBJECT is a mouse movement event."
(eq (car-safe object) 'mouse-movement))
(defun mouse-event-p (object)
"Return non-nil if OBJECT is a mouse click event."
;; is this really correct? maybe remove mouse-movement?
(memq (event-basic-type object) '(mouse-1 mouse-2 mouse-3 mouse-movement)))
(defun event-start (event)
"Return the starting position of EVENT.
EVENT should be a mouse click, drag, or key press event. If
EVENT is nil, the value of `posn-at-point' is used instead.
The following accessor functions are used to access the elements
of the position:
`posn-window': The window the event is in.
`posn-area': A symbol identifying the area the event occurred in,
or nil if the event occurred in the text area.
`posn-point': The buffer position of the event.
`posn-x-y': The pixel-based coordinates of the event.
`posn-col-row': The estimated column and row corresponding to the
position of the event.
`posn-actual-col-row': The actual column and row corresponding to the
position of the event.
`posn-string': The string object of the event, which is either
nil or (STRING . POSITION)'.
`posn-image': The image object of the event, if any.
`posn-object': The image or string object of the event, if any.
`posn-timestamp': The time the event occurred, in milliseconds.
For more information, see Info node `(elisp)Click Events'."
(if (consp event) (nth 1 event)
(or (posn-at-point)
(list (selected-window) (point) '(0 . 0) 0))))
(defun event-end (event)
"Return the ending position of EVENT.
EVENT should be a click, drag, or key press event.
See `event-start' for a description of the value returned."
(if (consp event) (nth (if (consp (nth 2 event)) 2 1) event)
(or (posn-at-point)
(list (selected-window) (point) '(0 . 0) 0))))
(defsubst event-click-count (event)
"Return the multi-click count of EVENT, a click or drag event.
The return value is a positive integer."
(if (and (consp event) (integerp (nth 2 event))) (nth 2 event) 1))
(defsubst event-line-count (event)
"Return the line count of EVENT, a mousewheel event.
The return value is a positive integer."
(if (and (consp event) (integerp (nth 3 event))) (nth 3 event) 1))
;;;; Extracting fields of the positions in an event.
(defun posnp (obj)
"Return non-nil if OBJ appears to be a valid `posn' object specifying a window.
A `posn' object is returned from functions such as `event-start'.
If OBJ is a valid `posn' object, but specifies a frame rather
than a window, return nil."
;; FIXME: Correct the behavior of this function so that all valid
;; `posn' objects are recognized, after updating other code that
;; depends on its present behavior.
(and (windowp (car-safe obj))
(atom (car-safe (setq obj (cdr obj)))) ;AREA-OR-POS.
(integerp (car-safe (car-safe (setq obj (cdr obj))))) ;XOFFSET.
(integerp (car-safe (cdr obj))))) ;TIMESTAMP.
(defsubst posn-window (position)
"Return the window in POSITION.
POSITION should be a list of the form returned by the `event-start'
and `event-end' functions."
(nth 0 position))
(defsubst posn-area (position)
"Return the window area recorded in POSITION, or nil for the text area.
POSITION should be a list of the form returned by the `event-start'
and `event-end' functions."
(let ((area (if (consp (nth 1 position))
(car (nth 1 position))
(nth 1 position))))
(and (symbolp area) area)))
(defun posn-point (position)
"Return the buffer location in POSITION.
POSITION should be a list of the form returned by the `event-start'
and `event-end' functions.
Returns nil if POSITION does not correspond to any buffer location (e.g.
a click on a scroll bar)."
(or (nth 5 position)
(let ((pt (nth 1 position)))
(or (car-safe pt)
;; Apparently this can also be `vertical-scroll-bar' (bug#13979).
(if (integerp pt) pt)))))
(defun posn-set-point (position)
"Move point to POSITION.
Select the corresponding window as well."
(if (not (windowp (posn-window position)))
(error "Position not in text area of window"))
(select-window (posn-window position))
(if (numberp (posn-point position))
(goto-char (posn-point position))))
(defsubst posn-x-y (position)
"Return the x and y coordinates in POSITION.
The return value has the form (X . Y), where X and Y are given in
pixels. POSITION should be a list of the form returned by
`event-start' and `event-end'."
(nth 2 position))
(declare-function scroll-bar-scale "scroll-bar" (num-denom whole))
(defun posn-col-row (position)
"Return the nominal column and row in POSITION, measured in characters.
The column and row values are approximations calculated from the x
and y coordinates in POSITION and the frame's default character width
and default line height, including spacing.
For a scroll-bar event, the result column is 0, and the row
corresponds to the vertical position of the click in the scroll bar.
POSITION should be a list of the form returned by the `event-start'
and `event-end' functions."
(let* ((pair (posn-x-y position))
(frame-or-window (posn-window position))
(frame (if (framep frame-or-window)
frame-or-window
(window-frame frame-or-window)))
(window (when (windowp frame-or-window) frame-or-window))
(area (posn-area position)))
(cond
((null frame-or-window)
'(0 . 0))
((eq area 'vertical-scroll-bar)
(cons 0 (scroll-bar-scale pair (1- (window-height window)))))
((eq area 'horizontal-scroll-bar)
(cons (scroll-bar-scale pair (window-width window)) 0))
(t
;; FIXME: This should take line-spacing properties on
;; newlines into account.
(let* ((spacing (when (display-graphic-p frame)
(or (with-current-buffer
(window-buffer (frame-selected-window frame))
line-spacing)
(frame-parameter frame 'line-spacing)))))
(cond ((floatp spacing)
(setq spacing (truncate (* spacing
(frame-char-height frame)))))
((null spacing)
(setq spacing 0)))
(cons (/ (car pair) (frame-char-width frame))
(/ (cdr pair) (+ (frame-char-height frame) spacing))))))))
(defun posn-actual-col-row (position)
"Return the window row number in POSITION and character number in that row.
Return nil if POSITION does not contain the actual position; in that case
`posn-col-row' can be used to get approximate values.
POSITION should be a list of the form returned by the `event-start'
and `event-end' functions.
This function does not account for the width on display, like the
number of visual columns taken by a TAB or image. If you need
the coordinates of POSITION in character units, you should use
`posn-col-row', not this function."
(nth 6 position))
(defsubst posn-timestamp (position)
"Return the timestamp of POSITION.
POSITION should be a list of the form returned by the `event-start'
and `event-end' functions."
(nth 3 position))
(defun posn-string (position)
"Return the string object of POSITION.
Value is a cons (STRING . STRING-POS), or nil if not a string.
POSITION should be a list of the form returned by the `event-start'
and `event-end' functions."
(let ((x (nth 4 position)))
;; Apparently this can also be `handle' or `below-handle' (bug#13979).
(when (consp x) x)))
(defsubst posn-image (position)
"Return the image object of POSITION.
Value is a list (image ...), or nil if not an image.
POSITION should be a list of the form returned by the `event-start'
and `event-end' functions."
(nth 7 position))
(defsubst posn-object (position)
"Return the object (image or string) of POSITION.
Value is a list (image ...) for an image object, a cons cell
\(STRING . STRING-POS) for a string object, and nil for a buffer position.
POSITION should be a list of the form returned by the `event-start'
and `event-end' functions."
(or (posn-image position) (posn-string position)))
(defsubst posn-object-x-y (position)
"Return the x and y coordinates relative to the object of POSITION.
The return value has the form (DX . DY), where DX and DY are
given in pixels. POSITION should be a list of the form returned
by `event-start' and `event-end'."
(nth 8 position))
(defsubst posn-object-width-height (position)
"Return the pixel width and height of the object of POSITION.
The return value has the form (WIDTH . HEIGHT). POSITION should
be a list of the form returned by `event-start' and `event-end'."
(nth 9 position))
;;;; Obsolescent names for functions.
(make-obsolete 'forward-point "use (+ (point) N) instead." "23.1")
(make-obsolete 'buffer-has-markers-at nil "24.3")
;; bug#23850
(make-obsolete 'string-to-unibyte "use `encode-coding-string'." "26.1")
(make-obsolete 'string-as-unibyte "use `encode-coding-string'." "26.1")
(make-obsolete 'string-make-unibyte "use `encode-coding-string'." "26.1")
(make-obsolete 'string-to-multibyte "use `decode-coding-string'." "26.1")
(make-obsolete 'string-as-multibyte "use `decode-coding-string'." "26.1")
(make-obsolete 'string-make-multibyte "use `decode-coding-string'." "26.1")
(defun log10 (x)
"Return (log X 10), the log base 10 of X."
(declare (obsolete log "24.4"))
(log x 10))
;; These are used by VM and some old programs
(defalias 'focus-frame 'ignore "")
(make-obsolete 'focus-frame "it does nothing." "22.1")
(defalias 'unfocus-frame 'ignore "")
(make-obsolete 'unfocus-frame "it does nothing." "22.1")
(set-advertised-calling-convention
'all-completions '(string collection &optional predicate) "23.1")
(set-advertised-calling-convention 'unintern '(name obarray) "23.3")
(set-advertised-calling-convention 'indirect-function '(object) "25.1")
(set-advertised-calling-convention 'redirect-frame-focus '(frame focus-frame) "24.3")
;;;; Obsolescence declarations for variables, and aliases.
(make-obsolete-variable 'define-key-rebound-commands nil "23.2")
(make-obsolete-variable 'redisplay-end-trigger-functions 'jit-lock-register "23.1")
(make-obsolete-variable 'deferred-action-list 'post-command-hook "24.1")
(make-obsolete-variable 'deferred-action-function 'post-command-hook "24.1")
(make-obsolete-variable 'redisplay-dont-pause nil "24.5")
(make-obsolete 'window-redisplay-end-trigger nil "23.1")
(make-obsolete 'set-window-redisplay-end-trigger nil "23.1")
(make-obsolete 'process-filter-multibyte-p nil "23.1")
(make-obsolete 'set-process-filter-multibyte nil "23.1")
(make-obsolete-variable 'command-debug-status
"expect it to be removed in a future version." "25.2")
;; Lisp manual only updated in 22.1.
(define-obsolete-variable-alias 'executing-macro 'executing-kbd-macro
"before 19.34")
(define-obsolete-variable-alias 'x-lost-selection-hooks
'x-lost-selection-functions "22.1")
(define-obsolete-variable-alias 'x-sent-selection-hooks
'x-sent-selection-functions "22.1")
;; This was introduced in 21.4 for pre-unicode unification. That
;; usage was rendered obsolete in 23.1 which uses Unicode internally.
;; Other uses are possible, so this variable is not _really_ obsolete,
;; but Stefan insists to mark it so.
(make-obsolete-variable 'translation-table-for-input nil "23.1")
(make-obsolete-variable 'x-gtk-use-window-move nil "26.1")
(defvaralias 'messages-buffer-max-lines 'message-log-max)
;;;; Alternate names for functions - these are not being phased out.
(defalias 'send-string 'process-send-string)
(defalias 'send-region 'process-send-region)
(defalias 'string= 'string-equal)
(defalias 'string< 'string-lessp)
(defalias 'string> 'string-greaterp)
(defalias 'move-marker 'set-marker)
(defalias 'rplaca 'setcar)
(defalias 'rplacd 'setcdr)
(defalias 'beep 'ding) ;preserve lingual purity
(defalias 'indent-to-column 'indent-to)
(defalias 'backward-delete-char 'delete-backward-char)
(defalias 'search-forward-regexp (symbol-function 're-search-forward))
(defalias 'search-backward-regexp (symbol-function 're-search-backward))
(defalias 'int-to-string 'number-to-string)
(defalias 'store-match-data 'set-match-data)
(defalias 'chmod 'set-file-modes)
(defalias 'mkdir 'make-directory)
;; These are the XEmacs names:
(defalias 'point-at-eol 'line-end-position)
(defalias 'point-at-bol 'line-beginning-position)
(defalias 'user-original-login-name 'user-login-name)
;;;; Hook manipulation functions.
(defun add-hook (hook function &optional append local)
"Add to the value of HOOK the function FUNCTION.
FUNCTION is not added if already present.
FUNCTION is added (if necessary) at the beginning of the hook list
unless the optional argument APPEND is non-nil, in which case
FUNCTION is added at the end.
The optional fourth argument, LOCAL, if non-nil, says to modify
the hook's buffer-local value rather than its global value.
This makes the hook buffer-local, and it makes t a member of the
buffer-local value. That acts as a flag to run the hook
functions of the global value as well as in the local value.
HOOK should be a symbol, and FUNCTION may be any valid function. If
HOOK is void, it is first set to nil. If HOOK's value is a single
function, it is changed to a list of functions."
(or (boundp hook) (set hook nil))
(or (default-boundp hook) (set-default hook nil))
(if local (unless (local-variable-if-set-p hook)
(set (make-local-variable hook) (list t)))
;; Detect the case where make-local-variable was used on a hook
;; and do what we used to do.
(unless (and (consp (symbol-value hook)) (memq t (symbol-value hook)))
(setq local t)))
(let ((hook-value (if local (symbol-value hook) (default-value hook))))
;; If the hook value is a single function, turn it into a list.
(when (or (not (listp hook-value)) (functionp hook-value))
(setq hook-value (list hook-value)))
;; Do the actual addition if necessary
(unless (member function hook-value)
(when (stringp function)
(setq function (purecopy function)))
(setq hook-value
(if append
(append hook-value (list function))
(cons function hook-value))))
;; Set the actual variable
(if local
(progn
;; If HOOK isn't a permanent local,
;; but FUNCTION wants to survive a change of modes,
;; mark HOOK as partially permanent.
(and (symbolp function)
(get function 'permanent-local-hook)
(not (get hook 'permanent-local))
(put hook 'permanent-local 'permanent-local-hook))
(set hook hook-value))
(set-default hook hook-value))))
(defun remove-hook (hook function &optional local)
"Remove from the value of HOOK the function FUNCTION.
HOOK should be a symbol, and FUNCTION may be any valid function. If
FUNCTION isn't the value of HOOK, or, if FUNCTION doesn't appear in the
list of hooks to run in HOOK, then nothing is done. See `add-hook'.
The optional third argument, LOCAL, if non-nil, says to modify
the hook's buffer-local value rather than its default value."
(or (boundp hook) (set hook nil))
(or (default-boundp hook) (set-default hook nil))
;; Do nothing if LOCAL is t but this hook has no local binding.
(unless (and local (not (local-variable-p hook)))
;; Detect the case where make-local-variable was used on a hook
;; and do what we used to do.
(when (and (local-variable-p hook)
(not (and (consp (symbol-value hook))
(memq t (symbol-value hook)))))
(setq local t))
(let ((hook-value (if local (symbol-value hook) (default-value hook))))
;; Remove the function, for both the list and the non-list cases.
(if (or (not (listp hook-value)) (eq (car hook-value) 'lambda))
(if (equal hook-value function) (setq hook-value nil))
(setq hook-value (delete function (copy-sequence hook-value))))
;; If the function is on the global hook, we need to shadow it locally
;;(when (and local (member function (default-value hook))
;; (not (member (cons 'not function) hook-value)))
;; (push (cons 'not function) hook-value))
;; Set the actual variable
(if (not local)
(set-default hook hook-value)
(if (equal hook-value '(t))
(kill-local-variable hook)
(set hook hook-value))))))
(defmacro letrec (binders &rest body)
"Bind variables according to BINDERS then eval BODY.
The value of the last form in BODY is returned.
Each element of BINDERS is a list (SYMBOL VALUEFORM) which binds
SYMBOL to the value of VALUEFORM.
All symbols are bound before the VALUEFORMs are evalled."
;; Only useful in lexical-binding mode.
;; As a special-form, we could implement it more efficiently (and cleanly,
;; making the vars actually unbound during evaluation of the binders).
(declare (debug let) (indent 1))
`(let ,(mapcar #'car binders)
,@(mapcar (lambda (binder) `(setq ,@binder)) binders)
,@body))
(defmacro with-wrapper-hook (hook args &rest body)
"Run BODY, using wrapper functions from HOOK with additional ARGS.
HOOK is an abnormal hook. Each hook function in HOOK \"wraps\"
around the preceding ones, like a set of nested `around' advices.
Each hook function should accept an argument list consisting of a
function FUN, followed by the additional arguments in ARGS.
The first hook function in HOOK is passed a FUN that, if it is called
with arguments ARGS, performs BODY (i.e., the default operation).
The FUN passed to each successive hook function is defined based
on the preceding hook functions; if called with arguments ARGS,
it does what the `with-wrapper-hook' call would do if the
preceding hook functions were the only ones present in HOOK.
Each hook function may call its FUN argument as many times as it wishes,
including never. In that case, such a hook function acts to replace
the default definition altogether, and any preceding hook functions.
Of course, a subsequent hook function may do the same thing.
Each hook function definition is used to construct the FUN passed
to the next hook function, if any. The last (or \"outermost\")
FUN is then called once."
(declare (indent 2) (debug (form sexp body))
(obsolete "use a <foo>-function variable modified by `add-function'."
"24.4"))
`(subr--with-wrapper-hook-no-warnings ,hook ,args ,@body))
(defmacro subr--with-wrapper-hook-no-warnings (hook args &rest body)
"Like (with-wrapper-hook HOOK ARGS BODY), but without warnings."
;; We need those two gensyms because CL's lexical scoping is not available
;; for function arguments :-(
(let ((funs (make-symbol "funs"))
(global (make-symbol "global"))
(argssym (make-symbol "args"))
(runrestofhook (make-symbol "runrestofhook")))
;; Since the hook is a wrapper, the loop has to be done via
;; recursion: a given hook function will call its parameter in order to
;; continue looping.
`(letrec ((,runrestofhook
(lambda (,funs ,global ,argssym)
;; `funs' holds the functions left on the hook and `global'
;; holds the functions left on the global part of the hook
;; (in case the hook is local).
(if (consp ,funs)
(if (eq t (car ,funs))
(funcall ,runrestofhook
(append ,global (cdr ,funs)) nil ,argssym)
(apply (car ,funs)
(apply-partially
(lambda (,funs ,global &rest ,argssym)
(funcall ,runrestofhook ,funs ,global ,argssym))
(cdr ,funs) ,global)
,argssym))
;; Once there are no more functions on the hook, run
;; the original body.
(apply (lambda ,args ,@body) ,argssym)))))
(funcall ,runrestofhook ,hook
;; The global part of the hook, if any.
,(if (symbolp hook)
`(if (local-variable-p ',hook)
(default-value ',hook)))
(list ,@args)))))
(defun add-to-list (list-var element &optional append compare-fn)
"Add ELEMENT to the value of LIST-VAR if it isn't there yet.
The test for presence of ELEMENT is done with `equal', or with
COMPARE-FN if that's non-nil.
If ELEMENT is added, it is added at the beginning of the list,
unless the optional argument APPEND is non-nil, in which case
ELEMENT is added at the end.
The return value is the new value of LIST-VAR.
This is handy to add some elements to configuration variables,
but please do not abuse it in Elisp code, where you are usually
better off using `push' or `cl-pushnew'.
If you want to use `add-to-list' on a variable that is not
defined until a certain package is loaded, you should put the
call to `add-to-list' into a hook function that will be run only
after loading the package. `eval-after-load' provides one way to
do this. In some cases other hooks, such as major mode hooks,
can do the job."
(declare
(compiler-macro
(lambda (exp)
;; FIXME: Something like this could be used for `set' as well.
(if (or (not (eq 'quote (car-safe list-var)))
(special-variable-p (cadr list-var))
(not (macroexp-const-p append)))
exp
(let* ((sym (cadr list-var))
(append (eval append))
(msg (format-message
"`add-to-list' can't use lexical var `%s'; use `push' or `cl-pushnew'"
sym))
;; Big ugly hack so we only output a warning during
;; byte-compilation, and so we can use
;; byte-compile-not-lexical-var-p to silence the warning
;; when a defvar has been seen but not yet executed.
(warnfun (lambda ()
;; FIXME: We should also emit a warning for let-bound
;; variables with dynamic binding.
(when (assq sym byte-compile--lexical-environment)
(byte-compile-report-error msg :fill))))
(code
(macroexp-let2 macroexp-copyable-p x element
`(if ,(if compare-fn
(progn
(require 'cl-lib)
`(cl-member ,x ,sym :test ,compare-fn))
;; For bootstrapping reasons, don't rely on
;; cl--compiler-macro-member for the base case.
`(member ,x ,sym))
,sym
,(if append
`(setq ,sym (append ,sym (list ,x)))
`(push ,x ,sym))))))
(if (not (macroexp--compiling-p))
code
`(progn
(macroexp--funcall-if-compiled ',warnfun)
,code)))))))
(if (cond
((null compare-fn)
(member element (symbol-value list-var)))
((eq compare-fn 'eq)
(memq element (symbol-value list-var)))
((eq compare-fn 'eql)
(memql element (symbol-value list-var)))
(t
(let ((lst (symbol-value list-var)))
(while (and lst
(not (funcall compare-fn element (car lst))))
(setq lst (cdr lst)))
lst)))
(symbol-value list-var)
(set list-var
(if append
(append (symbol-value list-var) (list element))
(cons element (symbol-value list-var))))))
(defun add-to-ordered-list (list-var element &optional order)
"Add ELEMENT to the value of LIST-VAR if it isn't there yet.
The test for presence of ELEMENT is done with `eq'.
The resulting list is reordered so that the elements are in the
order given by each element's numeric list order. Elements
without a numeric list order are placed at the end of the list.
If the third optional argument ORDER is a number (integer or
float), set the element's list order to the given value. If
ORDER is nil or omitted, do not change the numeric order of
ELEMENT. If ORDER has any other value, remove the numeric order
of ELEMENT if it has one.
The list order for each element is stored in LIST-VAR's
`list-order' property.
The return value is the new value of LIST-VAR."
(let ((ordering (get list-var 'list-order)))
(unless ordering
(put list-var 'list-order
(setq ordering (make-hash-table :weakness 'key :test 'eq))))
(when order
(puthash element (and (numberp order) order) ordering))
(unless (memq element (symbol-value list-var))
(set list-var (cons element (symbol-value list-var))))
(set list-var (sort (symbol-value list-var)
(lambda (a b)
(let ((oa (gethash a ordering))
(ob (gethash b ordering)))
(if (and oa ob)
(< oa ob)
oa)))))))
(defun add-to-history (history-var newelt &optional maxelt keep-all)
"Add NEWELT to the history list stored in the variable HISTORY-VAR.
Return the new history list.
If MAXELT is non-nil, it specifies the maximum length of the history.
Otherwise, the maximum history length is the value of the `history-length'
property on symbol HISTORY-VAR, if set, or the value of the `history-length'
variable. The possible values of maximum length have the same meaning as
the values of `history-length'.
Remove duplicates of NEWELT if `history-delete-duplicates' is non-nil.
If optional fourth arg KEEP-ALL is non-nil, add NEWELT to history even
if it is empty or a duplicate."
(unless maxelt
(setq maxelt (or (get history-var 'history-length)
history-length)))
(let ((history (symbol-value history-var))
tail)
(when (and (listp history)
(or keep-all
(not (stringp newelt))
(> (length newelt) 0))
(or keep-all
(not (equal (car history) newelt))))
(if history-delete-duplicates
(setq history (delete newelt history)))
(setq history (cons newelt history))
(when (integerp maxelt)
(if (= 0 maxelt)
(setq history nil)
(setq tail (nthcdr (1- maxelt) history))
(when (consp tail)
(setcdr tail nil)))))
(set history-var history)))
;;;; Mode hooks.
(defvar delay-mode-hooks nil
"If non-nil, `run-mode-hooks' should delay running the hooks.")
(defvar delayed-mode-hooks nil
"List of delayed mode hooks waiting to be run.")
(make-variable-buffer-local 'delayed-mode-hooks)
(put 'delay-mode-hooks 'permanent-local t)
(defvar delayed-after-hook-functions nil
"List of delayed :after-hook forms waiting to be run.
These forms come from `define-derived-mode'.")
(make-variable-buffer-local 'delayed-after-hook-functions)
(defvar change-major-mode-after-body-hook nil
"Normal hook run in major mode functions, before the mode hooks.")
(defvar after-change-major-mode-hook nil
"Normal hook run at the very end of major mode functions.")
(defun run-mode-hooks (&rest hooks)
"Run mode hooks `delayed-mode-hooks' and HOOKS, or delay HOOKS.
Call `hack-local-variables' to set up file local and directory local
variables.
If the variable `delay-mode-hooks' is non-nil, does not do anything,
just adds the HOOKS to the list `delayed-mode-hooks'.
Otherwise, runs hooks in the sequence: `change-major-mode-after-body-hook',
`delayed-mode-hooks' (in reverse order), HOOKS, then runs
`hack-local-variables', runs the hook `after-change-major-mode-hook', and
finally evaluates the functions in `delayed-after-hook-functions' (see
`define-derived-mode').
Major mode functions should use this instead of `run-hooks' when
running their FOO-mode-hook."
(if delay-mode-hooks
;; Delaying case.
(dolist (hook hooks)
(push hook delayed-mode-hooks))
;; Normal case, just run the hook as before plus any delayed hooks.
(setq hooks (nconc (nreverse delayed-mode-hooks) hooks))
(setq delayed-mode-hooks nil)
(apply 'run-hooks (cons 'change-major-mode-after-body-hook hooks))
(if (buffer-file-name)
(with-demoted-errors "File local-variables error: %s"
(hack-local-variables 'no-mode)))
(run-hooks 'after-change-major-mode-hook)
(dolist (fun (nreverse delayed-after-hook-functions))
(funcall fun))
(setq delayed-after-hook-functions nil)))
(defmacro delay-mode-hooks (&rest body)
"Execute BODY, but delay any `run-mode-hooks'.
These hooks will be executed by the first following call to
`run-mode-hooks' that occurs outside any `delay-mode-hooks' form.
Only affects hooks run in the current buffer."
(declare (debug t) (indent 0))
`(progn
(make-local-variable 'delay-mode-hooks)
(let ((delay-mode-hooks t))
,@body)))
;; PUBLIC: find if the current mode derives from another.
(defun provided-mode-derived-p (mode &rest modes)
"Non-nil if MODE is derived from one of MODES.
Uses the `derived-mode-parent' property of the symbol to trace backwards.
If you just want to check `major-mode', use `derived-mode-p'."
(while (and (not (memq mode modes))
(setq mode (get mode 'derived-mode-parent))))
mode)
(defun derived-mode-p (&rest modes)
"Non-nil if the current major mode is derived from one of MODES.
Uses the `derived-mode-parent' property of the symbol to trace backwards."
(apply #'provided-mode-derived-p major-mode modes))
;;;; Minor modes.
;; If a minor mode is not defined with define-minor-mode,
;; add it here explicitly.
;; isearch-mode is deliberately excluded, since you should
;; not call it yourself.
(defvar minor-mode-list '(auto-save-mode auto-fill-mode abbrev-mode
overwrite-mode view-mode
hs-minor-mode)
"List of all minor mode functions.")
(defun add-minor-mode (toggle name &optional keymap after toggle-fun)
"Register a new minor mode.
This is an XEmacs-compatibility function. Use `define-minor-mode' instead.
TOGGLE is a symbol which is the name of a buffer-local variable that
is toggled on or off to say whether the minor mode is active or not.
NAME specifies what will appear in the mode line when the minor mode
is active. NAME should be either a string starting with a space, or a
symbol whose value is such a string.
Optional KEYMAP is the keymap for the minor mode that will be added
to `minor-mode-map-alist'.
Optional AFTER specifies that TOGGLE should be added after AFTER
in `minor-mode-alist'.
Optional TOGGLE-FUN is an interactive function to toggle the mode.
It defaults to (and should by convention be) TOGGLE.
If TOGGLE has a non-nil `:included' property, an entry for the mode is
included in the mode-line minor mode menu.
If TOGGLE has a `:menu-tag', that is used for the menu item's label."
(unless (memq toggle minor-mode-list)
(push toggle minor-mode-list))
(unless toggle-fun (setq toggle-fun toggle))
(unless (eq toggle-fun toggle)
(put toggle :minor-mode-function toggle-fun))
;; Add the name to the minor-mode-alist.
(when name
(let ((existing (assq toggle minor-mode-alist)))
(if existing
(setcdr existing (list name))
(let ((tail minor-mode-alist) found)
(while (and tail (not found))
(if (eq after (caar tail))
(setq found tail)
(setq tail (cdr tail))))
(if found
(let ((rest (cdr found)))
(setcdr found nil)
(nconc found (list (list toggle name)) rest))
(push (list toggle name) minor-mode-alist))))))
;; Add the toggle to the minor-modes menu if requested.
(when (get toggle :included)
(define-key mode-line-mode-menu
(vector toggle)
(list 'menu-item
(concat
(or (get toggle :menu-tag)
(if (stringp name) name (symbol-name toggle)))
(let ((mode-name (if (symbolp name) (symbol-value name))))
(if (and (stringp mode-name) (string-match "[^ ]+" mode-name))
(concat " (" (match-string 0 mode-name) ")"))))
toggle-fun
:button (cons :toggle toggle))))
;; Add the map to the minor-mode-map-alist.
(when keymap
(let ((existing (assq toggle minor-mode-map-alist)))
(if existing
(setcdr existing keymap)
(let ((tail minor-mode-map-alist) found)
(while (and tail (not found))
(if (eq after (caar tail))
(setq found tail)
(setq tail (cdr tail))))
(if found
(let ((rest (cdr found)))
(setcdr found nil)
(nconc found (list (cons toggle keymap)) rest))
(push (cons toggle keymap) minor-mode-map-alist)))))))
;;;; Load history
(defsubst autoloadp (object)
"Non-nil if OBJECT is an autoload."
(eq 'autoload (car-safe object)))
;; (defun autoload-type (object)
;; "Returns the type of OBJECT or `function' or `command' if the type is nil.
;; OBJECT should be an autoload object."
;; (when (autoloadp object)
;; (let ((type (nth 3 object)))
;; (cond ((null type) (if (nth 2 object) 'command 'function))
;; ((eq 'keymap t) 'macro)
;; (type)))))
;; (defalias 'autoload-file #'cadr
;; "Return the name of the file from which AUTOLOAD will be loaded.
;; \n\(fn AUTOLOAD)")
(defun define-symbol-prop (symbol prop val)
"Define the property PROP of SYMBOL to be VAL.
This is to `put' what `defalias' is to `fset'."
;; Can't use `cl-pushnew' here (nor `push' on (cdr foo)).
;; (cl-pushnew symbol (alist-get prop
;; (alist-get 'define-symbol-props
;; current-load-list)))
(let ((sps (assq 'define-symbol-props current-load-list)))
(unless sps
(setq sps (list 'define-symbol-props))
(push sps current-load-list))
(let ((ps (assq prop sps)))
(unless ps
(setq ps (list prop))
(setcdr sps (cons ps (cdr sps))))
(unless (member symbol (cdr ps))
(setcdr ps (cons symbol (cdr ps))))))
(put symbol prop val))
(defun symbol-file (symbol &optional type)
"Return the name of the file that defined SYMBOL.
The value is normally an absolute file name. It can also be nil,
if the definition is not associated with any file. If SYMBOL
specifies an autoloaded function, the value can be a relative
file name without extension.
If TYPE is nil, then any kind of definition is acceptable. If
TYPE is `defun', `defvar', or `defface', that specifies function
definition, variable definition, or face definition only.
Otherwise TYPE is assumed to be a symbol property."
(if (and (or (null type) (eq type 'defun))
(symbolp symbol)
(autoloadp (symbol-function symbol)))
(nth 1 (symbol-function symbol))
(catch 'found
(pcase-dolist (`(,file . ,elems) load-history)
(when (if type
(if (eq type 'defvar)
;; Variables are present just as their names.
(member symbol elems)
;; Many other types are represented as (TYPE . NAME).
(or (member (cons type symbol) elems)
(memq symbol (alist-get type
(alist-get 'define-symbol-props
elems)))))
;; We accept all types, so look for variable def
;; and then for any other kind.
(or (member symbol elems)
(let ((match (rassq symbol elems)))
(and match
(not (eq 'require (car match)))))))
(throw 'found file))))))
(defun locate-library (library &optional nosuffix path interactive-call)
"Show the precise file name of Emacs library LIBRARY.
LIBRARY should be a relative file name of the library, a string.
It can omit the suffix (a.k.a. file-name extension) if NOSUFFIX is
nil (which is the default, see below).
This command searches the directories in `load-path' like `\\[load-library]'
to find the file that `\\[load-library] RET LIBRARY RET' would load.
Optional second arg NOSUFFIX non-nil means don't add suffixes `load-suffixes'
to the specified name LIBRARY.
If the optional third arg PATH is specified, that list of directories
is used instead of `load-path'.
When called from a program, the file name is normally returned as a
string. When run interactively, the argument INTERACTIVE-CALL is t,
and the file name is displayed in the echo area."
(interactive (list (completing-read "Locate library: "
(apply-partially
'locate-file-completion-table
load-path (get-load-suffixes)))
nil nil
t))
(let ((file (locate-file library
(or path load-path)
(append (unless nosuffix (get-load-suffixes))
load-file-rep-suffixes))))
(if interactive-call
(if file
(message "Library is file %s" (abbreviate-file-name file))
(message "No library %s in search path" library)))
file))
;;;; Process stuff.
(defun start-process (name buffer program &rest program-args)
"Start a program in a subprocess. Return the process object for it.
NAME is name for process. It is modified if necessary to make it unique.
BUFFER is the buffer (or buffer name) to associate with the process.
Process output (both standard output and standard error streams)
goes at end of BUFFER, unless you specify a filter function to
handle the output. BUFFER may also be nil, meaning that this
process is not associated with any buffer.
PROGRAM is the program file name. It is searched for in `exec-path'
\(which see). If nil, just associate a pty with the buffer. Remaining
arguments PROGRAM-ARGS are strings to give program as arguments.
If you want to separate standard output from standard error, use
`make-process' or invoke the command through a shell and redirect
one of them using the shell syntax.
The process runs in `default-directory' if that is local (as
determined by `unhandled-file-name-directory'), or \"~\"
otherwise. If you want to run a process in a remote directory
use `start-file-process'."
(unless (fboundp 'make-process)
(error "Emacs was compiled without subprocess support"))
(apply #'make-process
(append (list :name name :buffer buffer)
(if program
(list :command (cons program program-args))))))
(defun process-lines (program &rest args)
"Execute PROGRAM with ARGS, returning its output as a list of lines.
Signal an error if the program returns with a non-zero exit status."
(with-temp-buffer
(let ((status (apply 'call-process program nil (current-buffer) nil args)))
(unless (eq status 0)
(error "%s exited with status %s" program status))
(goto-char (point-min))
(let (lines)
(while (not (eobp))
(setq lines (cons (buffer-substring-no-properties
(line-beginning-position)
(line-end-position))
lines))
(forward-line 1))
(nreverse lines)))))
(defun process-live-p (process)
"Returns non-nil if PROCESS is alive.
A process is considered alive if its status is `run', `open',
`listen', `connect' or `stop'. Value is nil if PROCESS is not a
process."
(and (processp process)
(memq (process-status process)
'(run open listen connect stop))))
;; compatibility
(defun process-kill-without-query (process &optional _flag)
"Say no query needed if PROCESS is running when Emacs is exited.
Optional second argument if non-nil says to require a query.
Value is t if a query was formerly required."
(declare (obsolete
"use `process-query-on-exit-flag' or `set-process-query-on-exit-flag'."
"22.1"))
(let ((old (process-query-on-exit-flag process)))
(set-process-query-on-exit-flag process nil)
old))
(defun process-kill-buffer-query-function ()
"Ask before killing a buffer that has a running process."
(let ((process (get-buffer-process (current-buffer))))
(or (not process)
(not (memq (process-status process) '(run stop open listen)))
(not (process-query-on-exit-flag process))
(yes-or-no-p
(format "Buffer %S has a running process; kill it? "
(buffer-name (current-buffer)))))))
(add-hook 'kill-buffer-query-functions 'process-kill-buffer-query-function)
;; process plist management
(defun process-get (process propname)
"Return the value of PROCESS' PROPNAME property.
This is the last value stored with `(process-put PROCESS PROPNAME VALUE)'."
(plist-get (process-plist process) propname))
(defun process-put (process propname value)
"Change PROCESS' PROPNAME property to VALUE.
It can be retrieved with `(process-get PROCESS PROPNAME)'."
(set-process-plist process
(plist-put (process-plist process) propname value)))
;;;; Input and display facilities.
(defconst read-key-empty-map (make-sparse-keymap))
(defvar read-key-delay 0.01) ;Fast enough for 100Hz repeat rate, hopefully.
(defun read-key (&optional prompt)
"Read a key from the keyboard.
Contrary to `read-event' this will not return a raw event but instead will
obey the input decoding and translations usually done by `read-key-sequence'.
So escape sequences and keyboard encoding are taken into account.
When there's an ambiguity because the key looks like the prefix of
some sort of escape sequence, the ambiguity is resolved via `read-key-delay'."
;; This overriding-terminal-local-map binding also happens to
;; disable quail's input methods, so although read-key-sequence
;; always inherits the input method, in practice read-key does not
;; inherit the input method (at least not if it's based on quail).
(let ((overriding-terminal-local-map nil)
(overriding-local-map read-key-empty-map)
(echo-keystrokes 0)
(old-global-map (current-global-map))
(timer (run-with-idle-timer
;; Wait long enough that Emacs has the time to receive and
;; process all the raw events associated with the single-key.
;; But don't wait too long, or the user may find the delay
;; annoying (or keep hitting more keys which may then get
;; lost or misinterpreted).
;; This is only relevant for keys which Emacs perceives as
;; "prefixes", such as C-x (because of the C-x 8 map in
;; key-translate-table and the C-x @ map in function-key-map)
;; or ESC (because of terminal escape sequences in
;; input-decode-map).
read-key-delay t
(lambda ()
(let ((keys (this-command-keys-vector)))
(unless (zerop (length keys))
;; `keys' is non-empty, so the user has hit at least
;; one key; there's no point waiting any longer, even
;; though read-key-sequence thinks we should wait
;; for more input to decide how to interpret the
;; current input.
(throw 'read-key keys)))))))
(unwind-protect
(progn
(use-global-map
(let ((map (make-sparse-keymap)))
;; Don't hide the menu-bar and tool-bar entries.
(define-key map [menu-bar] (lookup-key global-map [menu-bar]))
(define-key map [tool-bar]
;; This hack avoids evaluating the :filter (Bug#9922).
(or (cdr (assq 'tool-bar global-map))
(lookup-key global-map [tool-bar])))
map))
(let* ((keys
(catch 'read-key (read-key-sequence-vector prompt nil t)))
(key (aref keys 0)))
(if (and (> (length keys) 1)
(memq key '(mode-line header-line
left-fringe right-fringe)))
(aref keys 1)
key)))
(cancel-timer timer)
;; For some reason, `read-key(-sequence)' leaves the prompt in the echo
;; area, whereas `read-event' seems to empty it just before returning
;; (bug#22714). So, let's mimic the behavior of `read-event'.
(message nil)
(use-global-map old-global-map))))
(defvar read-passwd-map
;; BEWARE: `defconst' would purecopy it, breaking the sharing with
;; minibuffer-local-map along the way!
(let ((map (make-sparse-keymap)))
(set-keymap-parent map minibuffer-local-map)
(define-key map "\C-u" #'delete-minibuffer-contents) ;bug#12570
map)
"Keymap used while reading passwords.")
(defun read-passwd (prompt &optional confirm default)
"Read a password, prompting with PROMPT, and return it.
If optional CONFIRM is non-nil, read the password twice to make sure.
Optional DEFAULT is a default password to use instead of empty input.
This function echoes `.' for each character that the user types.
You could let-bind `read-hide-char' to another hiding character, though.
Once the caller uses the password, it can erase the password
by doing (clear-string STRING)."
(if confirm
(let (success)
(while (not success)
(let ((first (read-passwd prompt nil default))
(second (read-passwd "Confirm password: " nil default)))
(if (equal first second)
(progn
(and (arrayp second) (not (eq first second)) (clear-string second))
(setq success first))
(and (arrayp first) (clear-string first))
(and (arrayp second) (clear-string second))
(message "Password not repeated accurately; please start over")
(sit-for 1))))
success)
(let ((hide-chars-fun
(lambda (beg end _len)
(clear-this-command-keys)
(setq beg (min end (max (minibuffer-prompt-end)
beg)))
(dotimes (i (- end beg))
(put-text-property (+ i beg) (+ 1 i beg)
'display (string (or read-hide-char ?.))))))
minibuf)
(minibuffer-with-setup-hook
(lambda ()
(setq minibuf (current-buffer))
;; Turn off electricity.
(setq-local post-self-insert-hook nil)
(setq-local buffer-undo-list t)
(setq-local select-active-regions nil)
(use-local-map read-passwd-map)
(setq-local inhibit-modification-hooks nil) ;bug#15501.
(setq-local show-paren-mode nil) ;bug#16091.
(add-hook 'after-change-functions hide-chars-fun nil 'local))
(unwind-protect
(let ((enable-recursive-minibuffers t)
(read-hide-char (or read-hide-char ?.)))
(read-string prompt nil t default)) ; t = "no history"
(when (buffer-live-p minibuf)
(with-current-buffer minibuf
;; Not sure why but it seems that there might be cases where the
;; minibuffer is not always properly reset later on, so undo
;; whatever we've done here (bug#11392).
(remove-hook 'after-change-functions hide-chars-fun 'local)
(kill-local-variable 'post-self-insert-hook)
;; And of course, don't keep the sensitive data around.
(erase-buffer))))))))
(defun read-number (prompt &optional default)
"Read a numeric value in the minibuffer, prompting with PROMPT.
DEFAULT specifies a default value to return if the user just types RET.
The value of DEFAULT is inserted into PROMPT.
This function is used by the `interactive' code letter `n'."
(let ((n nil)
(default1 (if (consp default) (car default) default)))
(when default1
(setq prompt
(if (string-match "\\(\\):[ \t]*\\'" prompt)
(replace-match (format " (default %s)" default1) t t prompt 1)
(replace-regexp-in-string "[ \t]*\\'"
(format " (default %s) " default1)
prompt t t))))
(while
(progn
(let ((str (read-from-minibuffer
prompt nil nil nil nil
(when default
(if (consp default)
(mapcar 'number-to-string (delq nil default))
(number-to-string default))))))
(condition-case nil
(setq n (cond
((zerop (length str)) default1)
((stringp str) (read str))))
(error nil)))
(unless (numberp n)
(message "Please enter a number.")
(sit-for 1)
t)))
n))
(defun read-char-choice (prompt chars &optional inhibit-keyboard-quit)
"Read and return one of CHARS, prompting for PROMPT.
Any input that is not one of CHARS is ignored.
If optional argument INHIBIT-KEYBOARD-QUIT is non-nil, ignore
keyboard-quit events while waiting for a valid input."
(unless (consp chars)
(error "Called `read-char-choice' without valid char choices"))
(let (char done show-help (helpbuf " *Char Help*"))
(let ((cursor-in-echo-area t)
(executing-kbd-macro executing-kbd-macro)
(esc-flag nil))
(save-window-excursion ; in case we call help-form-show
(while (not done)
(unless (get-text-property 0 'face prompt)
(setq prompt (propertize prompt 'face 'minibuffer-prompt)))
(setq char (let ((inhibit-quit inhibit-keyboard-quit))
(read-key prompt)))
(and show-help (buffer-live-p (get-buffer helpbuf))
(kill-buffer helpbuf))
(cond
((not (numberp char)))
;; If caller has set help-form, that's enough.
;; They don't explicitly have to add help-char to chars.
((and help-form
(eq char help-char)
(setq show-help t)
(help-form-show)))
((memq char chars)
(setq done t))
((and executing-kbd-macro (= char -1))
;; read-event returns -1 if we are in a kbd macro and
;; there are no more events in the macro. Attempt to
;; get an event interactively.
(setq executing-kbd-macro nil))
((not inhibit-keyboard-quit)
(cond
((and (null esc-flag) (eq char ?\e))
(setq esc-flag t))
((memq char '(?\C-g ?\e))
(keyboard-quit))))))))
;; Display the question with the answer. But without cursor-in-echo-area.
(message "%s%s" prompt (char-to-string char))
char))
(defun sit-for (seconds &optional nodisp obsolete)
"Redisplay, then wait for SECONDS seconds. Stop when input is available.
SECONDS may be a floating-point value.
\(On operating systems that do not support waiting for fractions of a
second, floating-point values are rounded down to the nearest integer.)
If optional arg NODISP is t, don't redisplay, just wait for input.
Redisplay does not happen if input is available before it starts.
Value is t if waited the full time with no input arriving, and nil otherwise.
An obsolete, but still supported form is
\(sit-for SECONDS &optional MILLISECONDS NODISP)
where the optional arg MILLISECONDS specifies an additional wait period,
in milliseconds; this was useful when Emacs was built without
floating point support."
(declare (advertised-calling-convention (seconds &optional nodisp) "22.1"))
;; This used to be implemented in C until the following discussion:
;; https://lists.gnu.org/r/emacs-devel/2006-07/msg00401.html
;; Then it was moved here using an implementation based on an idle timer,
;; which was then replaced by the use of read-event.
(if (numberp nodisp)
(setq seconds (+ seconds (* 1e-3 nodisp))
nodisp obsolete)
(if obsolete (setq nodisp obsolete)))
(cond
(noninteractive
(sleep-for seconds)
t)
((input-pending-p t)
nil)
((or (<= seconds 0)
;; We are going to call read-event below, which will record
;; the next key as part of the macro, even if that key
;; invokes kmacro-end-macro, so if we are recording a macro,
;; the macro will recursively call itself. In addition, when
;; that key is removed from unread-command-events, it will be
;; recorded the second time, so the macro will have each key
;; doubled. This used to happen if a macro was defined with
;; Flyspell mode active (because Flyspell calls sit-for in its
;; post-command-hook, see bug #21329.) To avoid all that, we
;; simply disable the wait when we are recording a macro.
defining-kbd-macro)
(or nodisp (redisplay)))
(t
(or nodisp (redisplay))
;; FIXME: we should not read-event here at all, because it's much too
;; difficult to reliably "undo" a read-event by pushing it onto
;; unread-command-events.
;; For bug#14782, we need read-event to do the keyboard-coding-system
;; decoding (hence non-nil as second arg under POSIX ttys).
;; For bug#15614, we need read-event not to inherit-input-method.
;; So we temporarily suspend input-method-function.
(let ((read (let ((input-method-function nil))
(read-event nil t seconds))))
(or (null read)
(progn
;; https://lists.gnu.org/r/emacs-devel/2006-10/msg00394.html
;; We want `read' appear in the next command's this-command-event
;; but not in the current one.
;; By pushing (cons t read), we indicate that `read' has not
;; yet been recorded in this-command-keys, so it will be recorded
;; next time it's read.
;; And indeed the `seconds' argument to read-event correctly
;; prevented recording this event in the current command's
;; this-command-keys.
(push (cons t read) unread-command-events)
nil))))))
;; Behind display-popup-menus-p test.
(declare-function x-popup-dialog "menu.c" (position contents &optional header))
(defun y-or-n-p (prompt)
"Ask user a \"y or n\" question.
Return t if answer is \"y\" and nil if it is \"n\".
PROMPT is the string to display to ask the question. It should
end in a space; `y-or-n-p' adds \"(y or n) \" to it.
No confirmation of the answer is requested; a single character is
enough. SPC also means yes, and DEL means no.
To be precise, this function translates user input into responses
by consulting the bindings in `query-replace-map'; see the
documentation of that variable for more information. In this
case, the useful bindings are `act', `skip', `recenter',
`scroll-up', `scroll-down', and `quit'.
An `act' response means yes, and a `skip' response means no.
A `quit' response means to invoke `keyboard-quit'.
If the user enters `recenter', `scroll-up', or `scroll-down'
responses, perform the requested window recentering or scrolling
and ask again.
Under a windowing system a dialog box will be used if `last-nonmenu-event'
is nil and `use-dialog-box' is non-nil."
;; ¡Beware! when I tried to edebug this code, Emacs got into a weird state
;; where all the keys were unbound (i.e. it somehow got triggered
;; within read-key, apparently). I had to kill it.
(let ((answer 'recenter)
(padded (lambda (prompt &optional dialog)
(let ((l (length prompt)))
(concat prompt
(if (or (zerop l) (eq ?\s (aref prompt (1- l))))
"" " ")
(if dialog "" "(y or n) "))))))
(cond
(noninteractive
(setq prompt (funcall padded prompt))
(let ((temp-prompt prompt))
(while (not (memq answer '(act skip)))
(let ((str (read-string temp-prompt)))
(cond ((member str '("y" "Y")) (setq answer 'act))
((member str '("n" "N")) (setq answer 'skip))
(t (setq temp-prompt (concat "Please answer y or n. "
prompt))))))))
((and (display-popup-menus-p)
last-input-event ; not during startup
(listp last-nonmenu-event)
use-dialog-box)
(setq prompt (funcall padded prompt t)
answer (x-popup-dialog t `(,prompt ("Yes" . act) ("No" . skip)))))
(t
(setq prompt (funcall padded prompt))
(while
(let* ((scroll-actions '(recenter scroll-up scroll-down
scroll-other-window scroll-other-window-down))
(key
(let ((cursor-in-echo-area t))
(when minibuffer-auto-raise
(raise-frame (window-frame (minibuffer-window))))
(read-key (propertize (if (memq answer scroll-actions)
prompt
(concat "Please answer y or n. "
prompt))
'face 'minibuffer-prompt)))))
(setq answer (lookup-key query-replace-map (vector key) t))
(cond
((memq answer '(skip act)) nil)
((eq answer 'recenter)
(recenter) t)
((eq answer 'scroll-up)
(ignore-errors (scroll-up-command)) t)
((eq answer 'scroll-down)
(ignore-errors (scroll-down-command)) t)
((eq answer 'scroll-other-window)
(ignore-errors (scroll-other-window)) t)
((eq answer 'scroll-other-window-down)
(ignore-errors (scroll-other-window-down)) t)
((or (memq answer '(exit-prefix quit)) (eq key ?\e))
(signal 'quit nil) t)
(t t)))
(ding)
(discard-input))))
(let ((ret (eq answer 'act)))
(unless noninteractive
(message "%s%c" prompt (if ret ?y ?n)))
ret)))
;;; Atomic change groups.
(defmacro atomic-change-group (&rest body)
"Perform BODY as an atomic change group.
This means that if BODY exits abnormally,
all of its changes to the current buffer are undone.
This works regardless of whether undo is enabled in the buffer.
This mechanism is transparent to ordinary use of undo;
if undo is enabled in the buffer and BODY succeeds, the
user can undo the change normally."
(declare (indent 0) (debug t))
(let ((handle (make-symbol "--change-group-handle--"))
(success (make-symbol "--change-group-success--")))
`(let ((,handle (prepare-change-group))
;; Don't truncate any undo data in the middle of this.
(undo-outer-limit nil)
(undo-limit most-positive-fixnum)
(undo-strong-limit most-positive-fixnum)
(,success nil))
(unwind-protect
(progn
;; This is inside the unwind-protect because
;; it enables undo if that was disabled; we need
;; to make sure that it gets disabled again.
(activate-change-group ,handle)
,@body
(setq ,success t))
;; Either of these functions will disable undo
;; if it was disabled before.
(if ,success
(accept-change-group ,handle)
(cancel-change-group ,handle))))))
(defun prepare-change-group (&optional buffer)
"Return a handle for the current buffer's state, for a change group.
If you specify BUFFER, make a handle for BUFFER's state instead.
Pass the handle to `activate-change-group' afterward to initiate
the actual changes of the change group.
To finish the change group, call either `accept-change-group' or
`cancel-change-group' passing the same handle as argument. Call
`accept-change-group' to accept the changes in the group as final;
call `cancel-change-group' to undo them all. You should use
`unwind-protect' to make sure the group is always finished. The call
to `activate-change-group' should be inside the `unwind-protect'.
Once you finish the group, don't use the handle again--don't try to
finish the same group twice. For a simple example of correct use, see
the source code of `atomic-change-group'.
The handle records only the specified buffer. To make a multibuffer
change group, call this function once for each buffer you want to
cover, then use `nconc' to combine the returned values, like this:
(nconc (prepare-change-group buffer-1)
(prepare-change-group buffer-2))
You can then activate that multibuffer change group with a single
call to `activate-change-group' and finish it with a single call
to `accept-change-group' or `cancel-change-group'."
(if buffer
(list (cons buffer (with-current-buffer buffer buffer-undo-list)))
(list (cons (current-buffer) buffer-undo-list))))
(defun activate-change-group (handle)
"Activate a change group made with `prepare-change-group' (which see)."
(dolist (elt handle)
(with-current-buffer (car elt)
(if (eq buffer-undo-list t)
(setq buffer-undo-list nil)))))
(defun accept-change-group (handle)
"Finish a change group made with `prepare-change-group' (which see).
This finishes the change group by accepting its changes as final."
(dolist (elt handle)
(with-current-buffer (car elt)
(if (eq (cdr elt) t)
(setq buffer-undo-list t)))))
(defun cancel-change-group (handle)
"Finish a change group made with `prepare-change-group' (which see).
This finishes the change group by reverting all of its changes."
(dolist (elt handle)
(with-current-buffer (car elt)
(setq elt (cdr elt))
(save-restriction
;; Widen buffer temporarily so if the buffer was narrowed within
;; the body of `atomic-change-group' all changes can be undone.
(widen)
(let ((old-car (car-safe elt))
(old-cdr (cdr-safe elt)))
(unwind-protect
(progn
;; Temporarily truncate the undo log at ELT.
(when (consp elt)
(setcar elt nil) (setcdr elt nil))
(unless (eq last-command 'undo) (undo-start))
;; Make sure there's no confusion.
(when (and (consp elt) (not (eq elt (last pending-undo-list))))
(error "Undoing to some unrelated state"))
;; Undo it all.
(save-excursion
(while (listp pending-undo-list) (undo-more 1)))
;; Revert the undo info to what it was when we grabbed
;; the state.
(setq buffer-undo-list elt))
;; Reset the modified cons cell ELT to its original content.
(when (consp elt)
(setcar elt old-car)
(setcdr elt old-cdr))))))))
;;;; Display-related functions.
;; For compatibility.
(define-obsolete-function-alias 'redraw-modeline
'force-mode-line-update "24.3")
(defun momentary-string-display (string pos &optional exit-char message)
"Momentarily display STRING in the buffer at POS.
Display remains until next event is input.
If POS is a marker, only its position is used; its buffer is ignored.
Optional third arg EXIT-CHAR can be a character, event or event
description list. EXIT-CHAR defaults to SPC. If the input is
EXIT-CHAR it is swallowed; otherwise it is then available as
input (as a command if nothing else).
Display MESSAGE (optional fourth arg) in the echo area.
If MESSAGE is nil, instructions to type EXIT-CHAR are displayed there."
(or exit-char (setq exit-char ?\s))
(let ((ol (make-overlay pos pos))
(str (copy-sequence string)))
(unwind-protect
(progn
(save-excursion
(overlay-put ol 'after-string str)
(goto-char pos)
;; To avoid trouble with out-of-bounds position
(setq pos (point))
;; If the string end is off screen, recenter now.
(if (<= (window-end nil t) pos)
(recenter (/ (window-height) 2))))
(message (or message "Type %s to continue editing.")
(single-key-description exit-char))
(let ((event (read-key)))
;; `exit-char' can be an event, or an event description list.
(or (eq event exit-char)
(eq event (event-convert-list exit-char))
(setq unread-command-events
(append (this-single-command-raw-keys)
unread-command-events)))))
(delete-overlay ol))))
;;;; Overlay operations
(defun copy-overlay (o)
"Return a copy of overlay O."
(let ((o1 (if (overlay-buffer o)
(make-overlay (overlay-start o) (overlay-end o)
;; FIXME: there's no easy way to find the
;; insertion-type of the two markers.
(overlay-buffer o))
(let ((o1 (make-overlay (point-min) (point-min))))
(delete-overlay o1)
o1)))
(props (overlay-properties o)))
(while props
(overlay-put o1 (pop props) (pop props)))
o1))
(defun remove-overlays (&optional beg end name val)
"Clear BEG and END of overlays whose property NAME has value VAL.
Overlays might be moved and/or split.
BEG and END default respectively to the beginning and end of buffer."
;; This speeds up the loops over overlays.
(unless beg (setq beg (point-min)))
(unless end (setq end (point-max)))
(overlay-recenter end)
(if (< end beg)
(setq beg (prog1 end (setq end beg))))
(save-excursion
(dolist (o (overlays-in beg end))
(when (eq (overlay-get o name) val)
;; Either push this overlay outside beg...end
;; or split it to exclude beg...end
;; or delete it entirely (if it is contained in beg...end).
(if (< (overlay-start o) beg)
(if (> (overlay-end o) end)
(progn
(move-overlay (copy-overlay o)
(overlay-start o) beg)
(move-overlay o end (overlay-end o)))
(move-overlay o (overlay-start o) beg))
(if (> (overlay-end o) end)
(move-overlay o end (overlay-end o))
(delete-overlay o)))))))
;;;; Miscellanea.
(defvar suspend-hook nil
"Normal hook run by `suspend-emacs', before suspending.")
(defvar suspend-resume-hook nil
"Normal hook run by `suspend-emacs', after Emacs is continued.")
(defvar temp-buffer-show-hook nil
"Normal hook run by `with-output-to-temp-buffer' after displaying the buffer.
When the hook runs, the temporary buffer is current, and the window it
was displayed in is selected.")
(defvar temp-buffer-setup-hook nil
"Normal hook run by `with-output-to-temp-buffer' at the start.
When the hook runs, the temporary buffer is current.
This hook is normally set up with a function to put the buffer in Help
mode.")
(defconst user-emacs-directory
(if (eq system-type 'ms-dos)
;; MS-DOS cannot have initial dot.
"~/_emacs.d/"
"~/.emacs.d/")
"Directory beneath which additional per-user Emacs-specific files are placed.
Various programs in Emacs store information in this directory.
Note that this should end with a directory separator.
See also `locate-user-emacs-file'.")
;;;; Misc. useful functions.
(defsubst buffer-narrowed-p ()
"Return non-nil if the current buffer is narrowed."
(/= (- (point-max) (point-min)) (buffer-size)))
(defun find-tag-default-bounds ()
"Determine the boundaries of the default tag, based on text at point.
Return a cons cell with the beginning and end of the found tag.
If there is no plausible default, return nil."
(bounds-of-thing-at-point 'symbol))
(defun find-tag-default ()
"Determine default tag to search for, based on text at point.
If there is no plausible default, return nil."
(let ((bounds (find-tag-default-bounds)))
(when bounds
(buffer-substring-no-properties (car bounds) (cdr bounds)))))
(defun find-tag-default-as-regexp ()
"Return regexp that matches the default tag at point.
If there is no tag at point, return nil.
When in a major mode that does not provide its own
`find-tag-default-function', return a regexp that matches the
symbol at point exactly."
(let ((tag (funcall (or find-tag-default-function
(get major-mode 'find-tag-default-function)
'find-tag-default))))
(if tag (regexp-quote tag))))
(defun find-tag-default-as-symbol-regexp ()
"Return regexp that matches the default tag at point as symbol.
If there is no tag at point, return nil.