[bpt/emacs.git] / lisp / find-lisp.el

;;; find-lisp.el --- Emulation of find in Emacs Lisp

;; Author:  Peter Breton
;; Created: Fri Mar 26 1999
;; Keywords: unix
;; Time-stamp: <2000-10-04 00:17:29 pbreton>

;; Copyright (C) 1999, 2000 Free Software Foundation, Inc.

;; 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 2, 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:
;;
;; This is a very generalized form of find; it basically implements a
;; recursive directory descent. The conditions which bound the search
;; are expressed as predicates, and I have not addressed the question
;; of how to wrap up the common chores that find does in a simpler
;; format than writing code for all the various predicates.
;;
;; Some random thoughts are to express simple queries directly with
;; user-level functions, and perhaps use some kind of forms interface
;; for medium-level queries. Really complicated queries can be
;; expressed in Lisp.
;;

;;; Todo
;;
;; It would be nice if we could sort the results without running the find
;; again. Maybe that could work by storing the original file attributes?

;;; Code:

;; Internal variables

(defvar find-lisp-regexp nil
  "Internal variable.")

(defconst find-lisp-line-indent "  "
  "Indentation for dired file lines.")

(defvar find-lisp-file-predicate nil
  "Predicate for choosing to include files.")

(defvar find-lisp-directory-predicate nil
  "Predicate for choosing to descend into directories.")

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Debugging Code
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(defvar find-lisp-debug-buffer "*Find Lisp Debug*"
  "Buffer for debugging information.")

(defvar find-lisp-debug nil
  "Whether debugging is enabled.")

(defun find-lisp-debug-message (message)
  "Print a debug message MESSAGE in `find-lisp-debug-buffer'."
  (set-buffer (get-buffer-create find-lisp-debug-buffer))
  (goto-char (point-max))
  (insert message "\n"))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Directory and File predicates
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(defun find-lisp-default-directory-predicate  (dir parent)
  "True if DIR is not a dot file, and not a symlink.
PARENT is the parent directory of DIR."
  (and find-lisp-debug
       (find-lisp-debug-message
	(format "Processing directory %s in %s" dir parent)))
  ;; Skip current and parent directories
  (not (or (string= dir ".")
	   (string= dir "..")
	   ;; Skip directories which are symlinks
	   ;; Easy way to circumvent recursive loops
	   (file-symlink-p dir))))

(defun find-lisp-default-file-predicate  (file dir)
  "True if FILE matches `find-lisp-regexp'.
DIR is the directory containing FILE."
  (and find-lisp-debug
       (find-lisp-debug-message
	(format "Processing file %s in %s" file dir)))
  (and (not (file-directory-p (expand-file-name file dir)))
       (string-match find-lisp-regexp file)))

(defun find-lisp-file-predicate-is-directory  (file dir)
  "True if FILE is a directory.
Argument DIR is the directory containing FILE."
  (and find-lisp-debug
       (find-lisp-debug-message
	(format "Processing file %s in %s" file dir)))
  (and (file-directory-p (expand-file-name file dir))
       (not (or (string= file ".")
		(string= file "..")))))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Find functions
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(defun find-lisp-find-files (directory regexp)
  "Find files in DIRECTORY which match REGEXP."
  (let ((file-predicate      'find-lisp-default-file-predicate)
	(directory-predicate 'find-lisp-default-directory-predicate)
	(find-lisp-regexp regexp)
	)
    (find-lisp-find-files-internal
     directory
     file-predicate
     directory-predicate)))

;; Workhorse function
(defun find-lisp-find-files-internal (directory file-predicate
						directory-predicate)
  "Find files under DIRECTORY which satisfy FILE-PREDICATE.
FILE-PREDICATE is a function which takes two arguments: the file and its
directory.

DIRECTORY-PREDICATE is used to decide whether to descend into directories.
It is a function which takes two arguments, the directory and its parent."
  (or (string-match "/$" directory)
      (setq directory (concat directory "/")))
  (let (results sub-results)
    (mapcar
     (function
      (lambda(file)
	(let ((fullname (expand-file-name file directory)))
	  (and (file-readable-p (expand-file-name file directory))
	       (progn
		 ;; If a directory, check it we should descend into it
		 (and (file-directory-p fullname)
		      (funcall directory-predicate file directory)
		      (progn
			(setq sub-results
			      (find-lisp-find-files-internal
			       fullname
			       file-predicate
			       directory-predicate))
			(if results
			    (nconc results sub-results)
			  (setq results sub-results))))
		 ;; For all files and directories, call the file predicate
		 (and (funcall file-predicate file directory)
		      (if results
			  (nconc results (list fullname))
			(setq results (list fullname))))
		 )))))
     (directory-files directory nil nil t))
    results))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Find-dired all in Lisp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(defun find-lisp-find-dired (dir regexp)
  "Find files in DIR, matching REGEXP."
  (interactive "DFind files in directory: \nsMatching regexp: ")
  (let ((find-lisp-regexp regexp))
    (find-lisp-find-dired-internal
     dir
     'find-lisp-default-file-predicate
     'find-lisp-default-directory-predicate
     "*Find Lisp Dired*")))

;; Just the subdirectories
(defun find-lisp-find-dired-subdirectories (dir)
  "Find all subdirectories of DIR."
  (interactive "DFind subdirectories of directory: ")
  (find-lisp-find-dired-internal
   dir
   'find-lisp-file-predicate-is-directory
   'find-lisp-default-directory-predicate
   "*Find Lisp Dired Subdirectories*"))

;; Most of this is lifted from find-dired.el
;;
(defun find-lisp-find-dired-internal (dir file-predicate
					  directory-predicate buffer-name)
  "Run find (Lisp version) and go into Dired mode on a buffer of the output."
  (let ((dired-buffers dired-buffers)
	buf
	(regexp find-lisp-regexp))
    ;; Expand DIR ("" means default-directory), and make sure it has a
    ;; trailing slash.
    (setq dir (abbreviate-file-name
	       (file-name-as-directory (expand-file-name dir))))
    ;; Check that it's really a directory.
    (or (file-directory-p dir)
	(error "find-dired needs a directory: %s" dir))
    (or
     (and (buffer-name)
	  (string= buffer-name (buffer-name)))
	(switch-to-buffer (setq buf (get-buffer-create buffer-name))))
    (widen)
    (kill-all-local-variables)
    (setq buffer-read-only nil)
    (erase-buffer)
    (setq default-directory dir)
    (dired-mode dir)

    (use-local-map (append (make-sparse-keymap) (current-local-map)))

    (make-local-variable 'find-lisp-file-predicate)
    (setq find-lisp-file-predicate file-predicate)
    (make-local-variable 'find-lisp-directory-predicate)
    (setq find-lisp-directory-predicate directory-predicate)
    (make-local-variable 'find-lisp-regexp)
    (setq find-lisp-regexp regexp)

    (make-local-variable 'revert-buffer-function)
    (setq revert-buffer-function
	  (function
	   (lambda(ignore1 ignore2)
	     (find-lisp-insert-directory
	      default-directory
	      find-lisp-file-predicate
	      find-lisp-directory-predicate
	      'ignore)
	     )
	   ))

    ;; Set subdir-alist so that Tree Dired will work:
    (if (fboundp 'dired-simple-subdir-alist)
	;; will work even with nested dired format (dired-nstd.el,v 1.15
	;; and later)
	(dired-simple-subdir-alist)
      ;; else we have an ancient tree dired (or classic dired, where
      ;; this does no harm)
      (set (make-local-variable 'dired-subdir-alist)
	   (list (cons default-directory (point-min-marker)))))
    (find-lisp-insert-directory
     dir file-predicate directory-predicate 'ignore)
    (goto-char (point-min))
    (dired-goto-next-file)))

(defun find-lisp-insert-directory  (dir
				    file-predicate
				    directory-predicate
				    sort-function)
  "Insert the results of `find-lisp-find-files' in the current buffer."
  (let ((buffer-read-only nil)
	(files (find-lisp-find-files-internal
		dir
		file-predicate
		directory-predicate))
	(len (length dir)))
    (erase-buffer)
    ;; Subdir headlerline must come first because the first marker in
    ;; subdir-alist points there.
    (insert find-lisp-line-indent dir ":\n")
    ;; Make second line a ``find'' line in analogy to the ``total'' or
    ;; ``wildcard'' line.
    ;;
    ;; No analog for find-lisp?
    (insert find-lisp-line-indent "\n")
    ;; Run the find function
    (mapcar
     (function
      (lambda(file)
	(find-lisp-find-dired-insert-file
	 (substring file len)
	 (current-buffer))))
     (sort files 'string-lessp))
    ;; FIXME: Sort function is ignored for now
    ;; (funcall sort-function files))
    (goto-char (point-min))
    (dired-goto-next-file)))

(defun find-lisp-find-dired-filter (regexp)
  "Change the filter on a find-lisp-find-dired buffer to REGEXP."
  (interactive "sSet filter to regexp: ")
  (setq find-lisp-regexp regexp)
  (revert-buffer))

(defun find-lisp-find-dired-insert-file (file buffer)
  (set-buffer buffer)
  (insert find-lisp-line-indent
	  (find-lisp-format file (file-attributes file) (list "")
			  (current-time))))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Lifted from ls-lisp. We don't want to require it, because that
;; would alter the insert-directory function.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(defun find-lisp-format (file-name file-attr switches now)
  (let ((file-type (nth 0 file-attr)))
    (concat (if (memq ?i switches)	; inode number
		(format "%6d " (nth 10 file-attr)))
	    ;; nil is treated like "" in concat
	    (if (memq ?s switches)	; size in K
		(format "%4d " (1+ (/ (nth 7 file-attr) 1024))))
	    (nth 8 file-attr)		; permission bits
	    ;; numeric uid/gid are more confusing than helpful
	    ;; Emacs should be able to make strings of them.
	    ;; user-login-name and user-full-name could take an
	    ;; optional arg.
	    (format " %3d %-8s %-8s %8d "
		    (nth 1 file-attr)	; no. of links
		    (if (= (user-uid) (nth 2 file-attr))
			(user-login-name)
		      (int-to-string (nth 2 file-attr)))	; uid
		    (if (eq system-type 'ms-dos)
			"root"		; everything is root on MSDOS.
		      (int-to-string (nth 3 file-attr)))	; gid
		    (nth 7 file-attr)	; size in bytes
		    )
	    (find-lisp-format-time file-attr switches now)
	    " "
	    file-name
	    (if (stringp file-type)	; is a symbolic link
		(concat " -> " file-type)
	      "")
	    "\n")))

(defun find-lisp-time-index (switches)
  ;; Return index into file-attributes according to ls SWITCHES.
  (cond
   ((memq ?c switches) 6)		; last mode change
   ((memq ?u switches) 4)		; last access
   ;; default is last modtime
   (t 5)))

(defun find-lisp-format-time (file-attr switches now)
  ;; Format time string for file with attributes FILE-ATTR according
  ;; to SWITCHES (a list of ls option letters of which c and u are recognized).
  ;; Use the same method as `ls' to decide whether to show time-of-day or year,
  ;; depending on distance between file date and NOW.
  (let* ((time (nth (find-lisp-time-index switches) file-attr))
	 (diff16 (- (car time) (car now)))
	 (diff (+ (ash diff16 16) (- (car (cdr time)) (car (cdr now)))))
	 (past-cutoff (- (* 6 30 24 60 60)))	; 6 30-day months
	 (future-cutoff (* 60 60)))		; 1 hour
    (format-time-string
     (if (and
	  (<= past-cutoff diff) (<= diff future-cutoff)
	  ;; Sanity check in case `diff' computation overflowed.
	  (<= (1- (ash past-cutoff -16)) diff16)
	  (<= diff16 (1+ (ash future-cutoff -16))))
	 "%b %e %H:%M"
       "%b %e  %Y")
     time)))

(provide 'find-lisp)

;;; find-lisp.el ends here

;; Local Variables:
;; autocompile: t
;; End:
Commit	Line	Data
6344985d GM	1	;;; find-lisp.el --- Emulation of find in Emacs Lisp
	2
	3	;; Author: Peter Breton
	4	;; Created: Fri Mar 26 1999
	5	;; Keywords: unix
82d11a0b	6	;; Time-stamp: <2000-10-04 00:17:29 pbreton>
6344985d GM	7
	8	;; Copyright (C) 1999, 2000 Free Software Foundation, Inc.
	9
	10	;; This file is part of GNU Emacs.
	11
	12	;; GNU Emacs is free software; you can redistribute it and/or modify
	13	;; it under the terms of the GNU General Public License as published by
	14	;; the Free Software Foundation; either version 2, or (at your option)
	15	;; any later version.
	16
	17	;; GNU Emacs is distributed in the hope that it will be useful,
	18	;; but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	;; GNU General Public License for more details.
	21
	22	;; You should have received a copy of the GNU General Public License
	23	;; along with GNU Emacs; see the file COPYING. If not, write to the
	24	;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	25	;; Boston, MA 02111-1307, USA.
	26
	27	;;; Commentary:
	28	;;
	29	;; This is a very generalized form of find; it basically implements a
	30	;; recursive directory descent. The conditions which bound the search
	31	;; are expressed as predicates, and I have not addressed the question
	32	;; of how to wrap up the common chores that find does in a simpler
	33	;; format than writing code for all the various predicates.
	34	;;
	35	;; Some random thoughts are to express simple queries directly with
	36	;; user-level functions, and perhaps use some kind of forms interface
	37	;; for medium-level queries. Really complicated queries can be
	38	;; expressed in Lisp.
82d11a0b	39	;;
6344985d GM	40
	41	;;; Todo
	42	;;
	43	;; It would be nice if we could sort the results without running the find
	44	;; again. Maybe that could work by storing the original file attributes?
	45
	46	;;; Code:
	47
	48	;; Internal variables
	49
	50	(defvar find-lisp-regexp nil
	51	"Internal variable.")
	52
	53	(defconst find-lisp-line-indent " "
	54	"Indentation for dired file lines.")
	55
	56	(defvar find-lisp-file-predicate nil
	57	"Predicate for choosing to include files.")
	58
	59	(defvar find-lisp-directory-predicate nil
	60	"Predicate for choosing to descend into directories.")
	61
	62	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	63	;; Debugging Code
	64	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	65
	66	(defvar find-lisp-debug-buffer "Find Lisp Debug"
	67	"Buffer for debugging information.")
	68
	69	(defvar find-lisp-debug nil
	70	"Whether debugging is enabled.")
	71
	72	(defun find-lisp-debug-message (message)
	73	"Print a debug message MESSAGE in `find-lisp-debug-buffer'."
	74	(set-buffer (get-buffer-create find-lisp-debug-buffer))
	75	(goto-char (point-max))
	76	(insert message "\n"))
	77
	78	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	79	;; Directory and File predicates
	80	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	81
	82	(defun find-lisp-default-directory-predicate (dir parent)
	83	"True if DIR is not a dot file, and not a symlink.
	84	PARENT is the parent directory of DIR."
	85	(and find-lisp-debug
82d11a0b	86	(find-lisp-debug-message
6344985d GM	87	(format "Processing directory %s in %s" dir parent)))
	88	;; Skip current and parent directories
	89	(not (or (string= dir ".")
	90	(string= dir "..")
	91	;; Skip directories which are symlinks
	92	;; Easy way to circumvent recursive loops
	93	(file-symlink-p dir))))
	94
	95	(defun find-lisp-default-file-predicate (file dir)
	96	"True if FILE matches `find-lisp-regexp'.
	97	DIR is the directory containing FILE."
	98	(and find-lisp-debug
82d11a0b	99	(find-lisp-debug-message
6344985d GM	100	(format "Processing file %s in %s" file dir)))
	101	(and (not (file-directory-p (expand-file-name file dir)))
	102	(string-match find-lisp-regexp file)))
	103
	104	(defun find-lisp-file-predicate-is-directory (file dir)
	105	"True if FILE is a directory.
	106	Argument DIR is the directory containing FILE."
	107	(and find-lisp-debug
82d11a0b	108	(find-lisp-debug-message
6344985d GM	109	(format "Processing file %s in %s" file dir)))
	110	(and (file-directory-p (expand-file-name file dir))
	111	(not (or (string= file ".")
	112	(string= file "..")))))
	113
	114	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	115	;; Find functions
	116	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	117
	118	(defun find-lisp-find-files (directory regexp)
	119	"Find files in DIRECTORY which match REGEXP."
	120	(let ((file-predicate 'find-lisp-default-file-predicate)
	121	(directory-predicate 'find-lisp-default-directory-predicate)
	122	(find-lisp-regexp regexp)
	123	)
82d11a0b PB	124	(find-lisp-find-files-internal
82d11a0b PB	125	directory
6344985d GM	126	file-predicate
	127	directory-predicate)))
	128
	129	;; Workhorse function
82d11a0b	130	(defun find-lisp-find-files-internal (directory file-predicate
6344985d GM	131	directory-predicate)
6344985d GM	132	"Find files under DIRECTORY which satisfy FILE-PREDICATE.
82d11a0b	133	FILE-PREDICATE is a function which takes two arguments: the file and its
6344985d GM	134	directory.
	135
	136	DIRECTORY-PREDICATE is used to decide whether to descend into directories.
	137	It is a function which takes two arguments, the directory and its parent."
82d11a0b PB	138	(or (string-match "/$" directory)
82d11a0b PB	139	(setq directory (concat directory "/")))
6344985d GM	140	(let (results sub-results)
	141	(mapcar
	142	(function
	143	(lambda(file)
	144	(let ((fullname (expand-file-name file directory)))
	145	(and (file-readable-p (expand-file-name file directory))
	146	(progn
	147	;; If a directory, check it we should descend into it
	148	(and (file-directory-p fullname)
	149	(funcall directory-predicate file directory)
	150	(progn
	151	(setq sub-results
	152	(find-lisp-find-files-internal
82d11a0b	153	fullname
6344985d GM	154	file-predicate
6344985d GM	155	directory-predicate))
82d11a0b	156	(if results
6344985d GM	157	(nconc results sub-results)
	158	(setq results sub-results))))
	159	;; For all files and directories, call the file predicate
	160	(and (funcall file-predicate file directory)
82d11a0b	161	(if results
6344985d GM	162	(nconc results (list fullname))
	163	(setq results (list fullname))))
	164	)))))
	165	(directory-files directory nil nil t))
	166	results))
	167
	168	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	169	;; Find-dired all in Lisp
	170	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	171
	172	(defun find-lisp-find-dired (dir regexp)
	173	"Find files in DIR, matching REGEXP."
	174	(interactive "DFind files in directory: \nsMatching regexp: ")
	175	(let ((find-lisp-regexp regexp))
	176	(find-lisp-find-dired-internal
	177	dir
	178	'find-lisp-default-file-predicate
	179	'find-lisp-default-directory-predicate
	180	"Find Lisp Dired")))
	181
	182	;; Just the subdirectories
	183	(defun find-lisp-find-dired-subdirectories (dir)
	184	"Find all subdirectories of DIR."
	185	(interactive "DFind subdirectories of directory: ")
	186	(find-lisp-find-dired-internal
	187	dir
	188	'find-lisp-file-predicate-is-directory
	189	'find-lisp-default-directory-predicate
	190	"Find Lisp Dired Subdirectories"))
	191
	192	;; Most of this is lifted from find-dired.el
82d11a0b PB	193	;;
82d11a0b PB	194	(defun find-lisp-find-dired-internal (dir file-predicate
6344985d GM	195	directory-predicate buffer-name)
	196	"Run find (Lisp version) and go into Dired mode on a buffer of the output."
	197	(let ((dired-buffers dired-buffers)
	198	buf
	199	(regexp find-lisp-regexp))
	200	;; Expand DIR ("" means default-directory), and make sure it has a
	201	;; trailing slash.
	202	(setq dir (abbreviate-file-name
	203	(file-name-as-directory (expand-file-name dir))))
	204	;; Check that it's really a directory.
	205	(or (file-directory-p dir)
	206	(error "find-dired needs a directory: %s" dir))
82d11a0b	207	(or
6344985d GM	208	(and (buffer-name)
	209	(string= buffer-name (buffer-name)))
	210	(switch-to-buffer (setq buf (get-buffer-create buffer-name))))
	211	(widen)
	212	(kill-all-local-variables)
	213	(setq buffer-read-only nil)
	214	(erase-buffer)
	215	(setq default-directory dir)
	216	(dired-mode dir)
	217
	218	(use-local-map (append (make-sparse-keymap) (current-local-map)))
	219
	220	(make-local-variable 'find-lisp-file-predicate)
	221	(setq find-lisp-file-predicate file-predicate)
	222	(make-local-variable 'find-lisp-directory-predicate)
	223	(setq find-lisp-directory-predicate directory-predicate)
	224	(make-local-variable 'find-lisp-regexp)
	225	(setq find-lisp-regexp regexp)
	226
	227	(make-local-variable 'revert-buffer-function)
	228	(setq revert-buffer-function
	229	(function
	230	(lambda(ignore1 ignore2)
82d11a0b	231	(find-lisp-insert-directory
6344985d GM	232	default-directory
	233	find-lisp-file-predicate
	234	find-lisp-directory-predicate
	235	'ignore)
	236	)
	237	))
	238
	239	;; Set subdir-alist so that Tree Dired will work:
	240	(if (fboundp 'dired-simple-subdir-alist)
	241	;; will work even with nested dired format (dired-nstd.el,v 1.15
	242	;; and later)
	243	(dired-simple-subdir-alist)
	244	;; else we have an ancient tree dired (or classic dired, where
82d11a0b	245	;; this does no harm)
6344985d GM	246	(set (make-local-variable 'dired-subdir-alist)
6344985d GM	247	(list (cons default-directory (point-min-marker)))))
82d11a0b	248	(find-lisp-insert-directory
6344985d GM	249	dir file-predicate directory-predicate 'ignore)
	250	(goto-char (point-min))
	251	(dired-goto-next-file)))
	252
82d11a0b PB	253	(defun find-lisp-insert-directory (dir
	254	file-predicate
	255	directory-predicate
6344985d GM	256	sort-function)
	257	"Insert the results of `find-lisp-find-files' in the current buffer."
	258	(let ((buffer-read-only nil)
82d11a0b PB	259	(files (find-lisp-find-files-internal
	260	dir
	261	file-predicate
6344985d GM	262	directory-predicate))
	263	(len (length dir)))
	264	(erase-buffer)
	265	;; Subdir headlerline must come first because the first marker in
	266	;; subdir-alist points there.
	267	(insert find-lisp-line-indent dir ":\n")
	268	;; Make second line a ``find'' line in analogy to the ``total'' or
82d11a0b	269	;; ``wildcard'' line.
6344985d GM	270	;;
	271	;; No analog for find-lisp?
	272	(insert find-lisp-line-indent "\n")
	273	;; Run the find function
	274	(mapcar
	275	(function
	276	(lambda(file)
82d11a0b	277	(find-lisp-find-dired-insert-file
6344985d GM	278	(substring file len)
	279	(current-buffer))))
	280	(sort files 'string-lessp))
	281	;; FIXME: Sort function is ignored for now
	282	;; (funcall sort-function files))
	283	(goto-char (point-min))
	284	(dired-goto-next-file)))
	285
	286	(defun find-lisp-find-dired-filter (regexp)
	287	"Change the filter on a find-lisp-find-dired buffer to REGEXP."
	288	(interactive "sSet filter to regexp: ")
	289	(setq find-lisp-regexp regexp)
	290	(revert-buffer))
	291
	292	(defun find-lisp-find-dired-insert-file (file buffer)
	293	(set-buffer buffer)
82d11a0b	294	(insert find-lisp-line-indent
6344985d GM	295	(find-lisp-format file (file-attributes file) (list "")
	296	(current-time))))
	297
	298	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	299	;; Lifted from ls-lisp. We don't want to require it, because that
	300	;; would alter the insert-directory function.
	301	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	302
	303	(defun find-lisp-format (file-name file-attr switches now)
	304	(let ((file-type (nth 0 file-attr)))
	305	(concat (if (memq ?i switches) ; inode number
	306	(format "%6d " (nth 10 file-attr)))
	307	;; nil is treated like "" in concat
	308	(if (memq ?s switches) ; size in K
	309	(format "%4d " (1+ (/ (nth 7 file-attr) 1024))))
	310	(nth 8 file-attr) ; permission bits
	311	;; numeric uid/gid are more confusing than helpful
	312	;; Emacs should be able to make strings of them.
	313	;; user-login-name and user-full-name could take an
	314	;; optional arg.
	315	(format " %3d %-8s %-8s %8d "
	316	(nth 1 file-attr) ; no. of links
	317	(if (= (user-uid) (nth 2 file-attr))
	318	(user-login-name)
	319	(int-to-string (nth 2 file-attr))) ; uid
	320	(if (eq system-type 'ms-dos)
	321	"root" ; everything is root on MSDOS.
	322	(int-to-string (nth 3 file-attr))) ; gid
	323	(nth 7 file-attr) ; size in bytes
	324	)
	325	(find-lisp-format-time file-attr switches now)
	326	" "
	327	file-name
	328	(if (stringp file-type) ; is a symbolic link
	329	(concat " -> " file-type)
	330	"")
	331	"\n")))
	332
	333	(defun find-lisp-time-index (switches)
	334	;; Return index into file-attributes according to ls SWITCHES.
	335	(cond
	336	((memq ?c switches) 6) ; last mode change
	337	((memq ?u switches) 4) ; last access
	338	;; default is last modtime
	339	(t 5)))
	340
	341	(defun find-lisp-format-time (file-attr switches now)
	342	;; Format time string for file with attributes FILE-ATTR according
	343	;; to SWITCHES (a list of ls option letters of which c and u are recognized).
	344	;; Use the same method as `ls' to decide whether to show time-of-day or year,
	345	;; depending on distance between file date and NOW.
	346	(let* ((time (nth (find-lisp-time-index switches) file-attr))
	347	(diff16 (- (car time) (car now)))
	348	(diff (+ (ash diff16 16) (- (car (cdr time)) (car (cdr now)))))
	349	(past-cutoff (- (* 6 30 24 60 60))) ; 6 30-day months
	350	(future-cutoff (* 60 60))) ; 1 hour
	351	(format-time-string
	352	(if (and
	353	(<= past-cutoff diff) (<= diff future-cutoff)
	354	;; Sanity check in case `diff' computation overflowed.
	355	(<= (1- (ash past-cutoff -16)) diff16)
	356	(<= diff16 (1+ (ash future-cutoff -16))))
	357	"%b %e %H:%M"
	358	"%b %e %Y")
359	time)))
360
361	(provide 'find-lisp)
362
363	;;; find-lisp.el ends here
364
365	;; Local Variables:
366	;; autocompile: t
367	;; End: