mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-27 07:37:33 +00:00
365 lines
12 KiB
EmacsLisp
365 lines
12 KiB
EmacsLisp
;;; find-lisp.el --- emulation of find in Emacs Lisp
|
|
|
|
;; Author: Peter Breton
|
|
;; Created: Fri Mar 26 1999
|
|
;; Keywords: unix
|
|
;; Time-stamp: <2001-07-16 12:42:35 pavel>
|
|
|
|
;; 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."
|
|
(setq directory (file-name-as-directory directory))
|
|
(let (results sub-results)
|
|
(dolist (file (directory-files directory nil nil t))
|
|
(let ((fullname (expand-file-name file directory)))
|
|
(when (file-readable-p (expand-file-name file directory))
|
|
;; 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)))))))
|
|
results))
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;; Find-dired all in Lisp
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
;;;###autoload
|
|
(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
|
|
;;;###autoload
|
|
(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)))
|
|
|
|
;;;###autoload
|
|
(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)
|
|
|
|
;; Local Variables:
|
|
;; autocompile: t
|
|
;; End:
|
|
|
|
;;; arch-tag: a711374c-f12a-46f6-aa18-ba7d77b9602a
|
|
;;; find-lisp.el ends here
|