subr.el

A framework written in Java for implementing high-level and dynamic languages, compiling them into J

(defun split-string (string &optional pattern)
  "Return a list of substrings of STRING which are separated by PATTERN.
If PATTERN is omitted, it defaults to \"[ \\f\\t\\n\\r\\v]+\"."
  (or pattern
      (setq pattern "[ \f\t\n\r\v]+"))
  (let (parts (start 0) (len (length string)))
    (if (string-match pattern string)
	(setq parts (cons (substring string 0 (match-beginning 0)) parts)
	      start (match-end 0)))
    (while (and (< start len)
		(string-match pattern string (if (> start (match-beginning 0))
						 start
					       (1+ start))))
      (setq parts (cons (substring string start (match-beginning 0)) parts)
	    start (match-end 0)))
    (nreverse (cons (substring string start) parts))))

;; #### #### #### AAaargh!  Must be in C, because it is used insanely
;; early in the bootstrap process.
;(defun split-path (path)
;  "Explode a search path into a list of strings.
;The path components are separated with the characters specified
;with `path-separator'."
;  (while (or (not stringp path-separator)
;	     (/= (length path-separator) 1))
;    (setq path-separator (signal 'error (list "\
;`path-separator' should be set to a single-character string"
;					      path-separator))))
;  (split-string-by-char path (aref separator 0)))

#|
(defmacro with-output-to-string (&rest forms)
  "Collect output to `standard-output' while evaluating FORMS and return
it as a string."
  ;; by "William G. Dubuque" <[e-mail]> w/ mods from Stig
  `(with-current-buffer (get-buffer-create
			 (generate-new-buffer-name " *string-output*"))
     (setq buffer-read-only nil)
     (buffer-disable-undo (current-buffer))
     (erase-buffer)
     (let ((standard-output (current-buffer)))
       ,@forms)
     (prog1
	 (buffer-string)
       (erase-buffer))))

(defmacro with-current-buffer (buffer &rest body)
  "Temporarily make BUFFER the current buffer and execute the forms in BODY.
The value returned is the value of the last form in BODY.
See also `with-temp-buffer'."
  `(save-current-buffer
    (set-buffer ,buffer)
    ,@body))

(defmacro with-temp-file (file &rest forms)
  "Create a new buffer, evaluate FORMS there, and write the buffer to FILE.
The value of the last form in FORMS is returned, like `progn'.
See also `with-temp-buffer'."
  (let ((temp-file (make-symbol "temp-file"))
	(temp-buffer (make-symbol "temp-buffer")))
    `(let ((,temp-file ,file)
	   (,temp-buffer
	    (get-buffer-create (generate-new-buffer-name " *temp file*"))))
       (unwind-protect
	   (prog1
	       (with-current-buffer ,temp-buffer
		 ,@forms)
	     (with-current-buffer ,temp-buffer
               (widen)
	       (write-region (point-min) (point-max) ,temp-file nil 0)))
	 (and (buffer-name ,temp-buffer)
	      (kill-buffer ,temp-buffer))))))

(defmacro with-temp-buffer (&rest forms)
  "Create a temporary buffer, and evaluate FORMS there like `progn'.
See also `with-temp-file' and `with-output-to-string'."
  (let ((temp-buffer (make-symbol "temp-buffer")))
    `(let ((,temp-buffer
	    (get-buffer-create (generate-new-buffer-name " *temp*"))))
       (unwind-protect
	   (with-current-buffer ,temp-buffer
	     ,@forms)
	 (and (buffer-name ,temp-buffer)
	      (kill-buffer ,temp-buffer))))))

;; Moved from mule-coding.el.
(defmacro with-string-as-buffer-contents (str &rest body)
  "With the contents of the current buffer being STR, run BODY.
Returns the new contents of the buffer, as modified by BODY.
The original current buffer is restored afterwards."
  `(with-temp-buffer
     (insert ,str)
     ,@body
     (buffer-string)))
|#

(defun insert-face (string face)
  "Insert STRING and highlight with FACE.  Return the extent created."
  (let ((p (point)) ext)
    (insert string)
    (setq ext (make-extent p (point)))
    (set-extent-face ext face)
    ext))

;; not obsolete.
(define-function 'string= 'string-equal)
(define-function 'string< 'string-lessp)
(define-function 'int-to-string 'number-to-string)
(define-function 'string-to-int 'string-to-number)

;; These two names are a bit awkward, as they conflict with the normal
;; foo-to-bar naming scheme, but CLtL2 has them, so they stay.
(define-function 'char-int 'char-to-int)
(define-function 'int-char 'int-to-char)


;; alist/plist functions
(defun plist-to-alist (plist)
  "Convert property list PLIST into the equivalent association-list form.
The alist is returned.  This converts from

\(a 1 b 2 c 3)

into

\((a . 1) (b . 2) (c . 3))

The original plist is not modified.  See also `destructive-plist-to-alist'."
  (let (alist)
    (while plist
      (setq alist (cons (cons (car plist) (cadr plist)) alist))
      (setq plist (cddr plist)))
    (nreverse alist)))

(defun destructive-plist-to-alist (plist)
  "Convert property list PLIST into the equivalent association-list form.
The alist is returned.  This converts from

\(a 1 b 2 c 3)

into

\((a . 1) (b . 2) (c . 3))

The original plist is destroyed in the process of constructing the alist.
See also `plist-to-alist'."
  (let ((head plist)
	next)
    (while plist
      ;; remember the next plist pair.
      (setq next (cddr plist))
      ;; make the cons holding the property value into the alist element.
      (setcdr (cdr plist) (cadr plist))
      (setcar (cdr plist) (car plist))
      ;; reattach into alist form.
      (setcar plist (cdr plist))
      (setcdr plist next)
      (setq plist next))
    head))

(defun alist-to-plist (alist)
  "Convert association list ALIST into the equivalent property-list form.
The plist is returned.  This converts from

\((a . 1) (b . 2) (c . 3))

into

\(a 1 b 2 c 3)

The original alist is not modified.  See also `destructive-alist-to-plist'."
  (let (plist)
    (while alist
      (let ((el (car alist)))
	(setq plist (cons (cdr el) (cons (car el) plist))))
      (setq alist (cdr alist)))
    (nreverse plist)))

;; getf, remf in cl*.el.

#|
(defmacro putf (plist prop val)
  "Add property PROP to plist PLIST with value VAL.
Analogous to (setq PLIST (plist-put PLIST PROP VAL))."
  `(setq ,plist (plist-put ,plist ,prop ,val)))

(defmacro laxputf (lax-plist prop val)
  "Add property PROP to lax plist LAX-PLIST with value VAL.
Analogous to (setq LAX-PLIST (lax-plist-put LAX-PLIST PROP VAL))."
  `(setq ,lax-plist (lax-plist-put ,lax-plist ,prop ,val)))

(defmacro laxremf (lax-plist prop)
  "Remove property PROP from lax plist LAX-PLIST.
Analogous to (setq LAX-PLIST (lax-plist-remprop LAX-PLIST PROP))."
  `(setq ,lax-plist (lax-plist-remprop ,lax-plist ,prop)))
|#

;;; Error functions

(defun error (&rest args)
  "Signal an error, making error message by passing all args to `format'.
This error is not continuable: you cannot continue execution after the
error using the debugger `r' command.  See also `cerror'."
  (while t
    (apply 'cerror args)))

(defun cerror (&rest args)
  "Like `error' but signals a continuable error."
  (signal 'error (list (apply 'format args))))

#|
(defmacro check-argument-type (predicate argument)
  "Check that ARGUMENT satisfies PREDICATE.
If not, signal a continuable `wrong-type-argument' error until the
returned value satisfies PREDICATE, and assign the returned value
to ARGUMENT."
  `(if (not (,(eval predicate) ,argument))
       (setq ,argument
	     (wrong-type-argument ,predicate ,argument))))
|#

(defun signal-error (error-symbol data)
  "Signal a non-continuable error.  Args are ERROR-SYMBOL, and associated DATA.
An error symbol is a symbol defined using `define-error'.
DATA should be a list.  Its elements are printed as part of the error message.
If the signal is handled, DATA is made available to the handler.
See also `signal', and the functions to handle errors: `condition-case'
and `call-with-condition-handler'."
  (while t
    (signal error-symbol data)))

(defun define-error (error-sym doc-string &optional inherits-from)
  "Define a new error, denoted by ERROR-SYM.
DOC-STRING is an informative message explaining the error, and will be
printed out when an unhandled error occurs.
ERROR-SYM is a sub-error of INHERITS-FROM (which defaults to `error').

\[`define-error' internally works by putting on ERROR-SYM an `error-message'
property whose value is DOC-STRING, and an `error-conditions' property
that is a list of ERROR-SYM followed by each of its super-errors, up
to and including `error'.  You will sometimes see code that sets this up
directly rather than calling `define-error', but you should *not* do this
yourself.]"
  (check-argument-type 'symbolp error-sym)
  (check-argument-type 'stringp doc-string)
  (put error-sym 'error-message doc-string)
  (or inherits-from (setq inherits-from 'error))
  (let ((conds (get inherits-from 'error-conditions)))
    (or conds (signal-error 'error (list "Not an error symbol" error-sym)))
    (put error-sym 'error-conditions (cons error-sym conds))))

;;;; Miscellanea.

;; This is now in C.
;(defun buffer-substring-no-properties (beg end)
;  "Return the text from BEG to END, without text properties, as a string."
;  (let ((string (buffer-substring beg end)))
;    (set-text-properties 0 (length string) nil string)
;    string))

(defun get-buffer-window-list (&optional buffer minibuf frame)
  "Return windows currently displaying BUFFER, or nil if none.
BUFFER defaults to the current buffer.
See `walk-windows' for the meaning of MINIBUF and FRAME."
  (cond ((null buffer)
	 (setq buffer (current-buffer)))
	((not (bufferp buffer))
	 (setq buffer (get-buffer buffer))))
  (let (windows)
    (walk-windows (lambda (window)
		    (if (eq (window-buffer window) buffer)
			(push window windows)))
		  minibuf frame)
    windows))

(defun ignore (&rest ignore)
  "Do nothing and return nil.
This function accepts any number of arguments, but ignores them."
  (interactive)
  nil)

(define-function 'eval-in-buffer 'with-current-buffer)
(make-obsolete 'eval-in-buffer 'with-current-buffer)

;;; The real defn is in abbrev.el but some early callers
;;;  (eg lisp-mode-abbrev-table) want this before abbrev.el is loaded...

(if (not (fboundp 'define-abbrev-table))
    (progn
      (setq abbrev-table-name-list '())
      (fset 'define-abbrev-table (function (lambda (name defs)
                                   ;; These are fixed-up when abbrev.el loads.
                                   (setq abbrev-table-name-list
                                         (cons (cons name defs)
                                               abbrev-table-name-list)))))))

;;; `functionp' has been moved into C.

;;(defun functionp (object)
;;  "Non-nil if OBJECT can be called as a function."
;;  (or (and (symbolp object) (fboundp object))
;;      (subrp object)
;;      (compiled-function-p object)
;;      (eq (car-safe object) 'lambda)))



(defun function-interactive (function)
  "Return the interactive specification of FUNCTION.
FUNCTION can be any funcallable object.
The specification will be returned as the list of the symbol `interactive'
 and the specs.
If FUNCTION is not interactive, nil will be returned."
  (setq function (indirect-function function))
  (cond ((compiled-function-p function)
	 (compiled-function-interactive function))
	((subrp function)
	 (subr-interactive function))
	((eq (car-safe function) 'lambda)
	 (let ((spec (if (stringp (nth 2 function))
			 (nth 3 function)
		       (nth 2 function))))
	   (and (eq (car-safe spec) 'interactive)
		spec)))
	(t
	 (error "Non-funcallable object: %s" function))))

;; This function used to be an alias to `buffer-substring', except
;; that FSF Emacs 20.4 added a BUFFER argument in an incompatible way.
;; The new FSF's semantics makes more sense, but we try to support
;; both for backward compatibility.
(defun buffer-string (&optional buffer old-end old-buffer)
  "Return the contents of the current buffer as a string.
If narrowing is in effect, this function returns only the visible part
of the buffer.

If BUFFER is specified, the contents of that buffer are returned.

The arguments OLD-END and OLD-BUFFER are supported for backward
compatibility with pre-21.2 XEmacsen times when arguments to this
function were (buffer-string &optional START END BUFFER)."
  (cond
   ((or (stringp buffer) (bufferp buffer))
    ;; Most definitely the new way.
    (buffer-substring nil nil buffer))
   ((or (stringp old-buffer) (bufferp old-buffer)
	(natnump buffer) (natnump old-end))
    ;; Definitely the old way.
    (buffer-substring buffer old-end old-buffer))
   (t
    ;; Probably the old way.
    (buffer-substring buffer old-end old-buffer))))

;; This was not present before.  I think Jamie had some objections
;; to this, so I'm leaving this undefined for now. --ben

;;; The objection is this: there is more than one way to load the same file.
;;; "foo", "foo.elc", "foo.el", and "/some/path/foo.elc" are all different
;;; ways to load the exact same code.  `eval-after-load' is too stupid to
;;; deal with this sort of thing.  If this sort of feature is desired, then
;;; it should work off of a hook on `provide'.  Features are unique and
;;; the arguments to (load) are not.  --Stig

;; We provide this for FSFmacs compatibility, at least until we devise
;; something better.

;;;; Specifying things to do after certain files are loaded.

(defun eval-after-load (file form)
  "Arrange that, if FILE is ever loaded, FORM will be run at that time.
This makes or adds to an entry on `after-load-alist'.
If FILE is already loaded, evaluate FORM right now.
It does nothing if FORM is already on the list for FILE.
FILE should be the name of a library, with no directory name."
  ;; Make sure there is an element for FILE.
  (or (assoc file after-load-alist)
      (setq after-load-alist (cons (list file) after-load-alist)))
  ;; Add FORM to the element if it isn't there.
  (let ((elt (assoc file after-load-alist)))
    (or (member form (cdr elt))
	(progn
	  (nconc elt (list form))
	  ;; If the file has been loaded already, run FORM right away.
	  (and (assoc file load-history)
	       (eval form)))))
  form)
(make-compatible 'eval-after-load "")

(defun eval-next-after-load (file)
  "Read the following input sexp, and run it whenever FILE is loaded.
This makes or adds to an entry on `after-load-alist'.
FILE should be the name of a library, with no directory name."
  (eval-after-load file (read)))
(make-compatible 'eval-next-after-load "")

; alternate names (not obsolete)
(if (not (fboundp 'mod)) (define-function 'mod '%))
(define-function 'move-marker 'set-marker)
(define-function 'beep 'ding)  ; preserve lingual purity
(define-function 'indent-to-column 'indent-to)
(define-function 'backward-delete-char 'delete-backward-char)
(define-function 'search-forward-regexp (symbol-function 're-search-forward))
(define-function 'search-backward-regexp (symbol-function 're-search-backward))
(define-function 'remove-directory 'delete-directory)
(define-function 'set-match-data 'store-match-data)
(define-function 'send-string-to-terminal 'external-debugging-output)

;;; subr.el ends here