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+;;; find-lisp.el --- Emulation of find in Emacs Lisp
+
+;; Author:  Peter Breton
+;; Created: Fri Mar 26 1999
+;; Keywords: unix
+;; Time-stamp: <1999-04-19 16:37:01 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."
+  (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: