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9dce08b608
(insert-directory): Renamed from dired-ls.
238 lines
8.3 KiB
EmacsLisp
238 lines
8.3 KiB
EmacsLisp
;;;; directory.el - emulate insert-directory completely in Emacs Lisp
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;; Copyright (C) 1992 by Sebastian Kremer <sk@thp.uni-koeln.de>
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 1, or (at your option)
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;; any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, write to the Free Software
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;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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;; INSTALLATION =======================================================
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;;
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;; Put this file into your load-path. To use it, load it
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;; with (load "directory").
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;; OVERVIEW ===========================================================
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;; This file overloads the function insert-directory to implement it
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;; directly from Emacs lisp, without running `ls' in a subprocess.
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;; It is useful if you cannot afford to fork Emacs on a real memory UNIX,
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;; under VMS, or if you don't have the ls program, or if you want
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;; different format from what ls offers.
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;; This function uses regexps instead of shell
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;; wildcards. If you enter regexps remember to double each $ sign.
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;; For example, to include files *.el, enter `.*\.el$$',
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;; resulting in the regexp `.*\.el$'.
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;; RESTRICTIONS =====================================================
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;; * many ls switches are ignored, see docstring of `insert-directory'.
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;; * Only numeric uid/gid
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;; TODO ==============================================================
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;; Recognize some more ls switches: R F
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(defun insert-directory (file &optional switches wildcard full-directory-p)
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"Insert directory listing for of FILE, formatted according to SWITCHES.
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Leaves point after the inserted text.
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Optional third arg WILDCARD means treat FILE as shell wildcard.
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Optional fourth arg FULL-DIRECTORY-P means file is a directory and
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switches do not contain `d', so that a full listing is expected.
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This version of the function comes from `directory.el'.
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It does not support ordinary shell wildcards; instead, it allows
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regular expressions to match file names.
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The switches that work are: A a c i r S s t u"
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(let (handler (handlers file-name-handler-alist))
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(save-match-data
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(while (and (consp handlers) (null handler))
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(if (and (consp (car handlers))
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(stringp (car (car handlers)))
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(string-match (car (car handlers)) file))
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(setq handler (cdr (car handlers))))
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(setq handlers (cdr handlers))))
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(if handler
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(funcall handler 'insert-directory file switches
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wildcard full-directory-p)
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(if wildcard
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(setq wildcard (file-name-nondirectory file) ; actually emacs regexp
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;; perhaps convert it from shell to emacs syntax?
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file (file-name-directory file)))
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(if (or wildcard
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full-directory-p)
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(let* ((dir (file-name-as-directory file))
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(default-directory dir);; so that file-attributes works
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(sum 0)
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elt
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short
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(file-list (directory-files dir nil wildcard))
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file-alist
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;; do all bindings here for speed
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fil attr)
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(cond ((memq ?A switches)
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(setq file-list
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(ls-lisp-delete-matching "^\\.\\.?$" file-list)))
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((not (memq ?a switches))
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;; if neither -A nor -a, flush . files
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(setq file-list
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(ls-lisp-delete-matching "^\\." file-list))))
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(setq file-alist
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(mapcar
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(function
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(lambda (x)
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;; file-attributes("~bogus") bombs
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(cons x (file-attributes (expand-file-name x)))))
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;; inserting the call to directory-files right here
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;; seems to stimulate an Emacs bug
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;; ILLEGAL DATATYPE (#o37777777727) or #o67
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file-list))
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(insert "total \007\n") ; filled in afterwards
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(setq file-alist
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(ls-lisp-handle-switches file-alist switches))
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(while file-alist
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(setq elt (car file-alist)
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short (car elt)
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attr (cdr elt)
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file-alist (cdr file-alist)
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fil (concat dir short)
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sum (+ sum (nth 7 attr)))
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(insert (ls-lisp-format short attr switches)))
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;; Fill in total size of all files:
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(save-excursion
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(search-backward "total \007")
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(goto-char (match-end 0))
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(delete-char -1)
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(insert (format "%d" (1+ (/ sum 1024))))))
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;; if not full-directory-p, FILE *must not* end in /, as
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;; file-attributes will not recognize a symlink to a directory
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;; must make it a relative filename as ls does:
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(setq file (file-name-nondirectory file))
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(insert (ls-lisp-format file (file-attributes file) switches))))))
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(defun ls-lisp-delete-matching (regexp list)
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;; Delete all elements matching REGEXP from LIST, return new list.
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;; Should perhaps use setcdr for efficiency.
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(let (result)
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(while list
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(or (string-match regexp (car list))
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(setq result (cons (car list) result)))
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(setq list (cdr list)))
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result))
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(defun ls-lisp-handle-switches (file-alist switches)
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;; FILE-ALIST's elements are (FILE . FILE-ATTRIBUTES).
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;; Return new alist sorted according to SWITCHES which is a list of
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;; characters. Default sorting is alphabetically.
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(let (index)
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(setq file-alist
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(sort file-alist
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(cond ((memq ?S switches) ; sorted on size
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(function
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(lambda (x y)
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;; 7th file attribute is file size
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;; Make largest file come first
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(< (nth 7 (cdr y))
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(nth 7 (cdr x))))))
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((memq ?t switches) ; sorted on time
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(setq index (ls-lisp-time-index switches))
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(function
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(lambda (x y)
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(ls-lisp-time-lessp (nth index (cdr y))
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(nth index (cdr x))))))
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(t ; sorted alphabetically
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(function
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(lambda (x y)
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(string-lessp (car x)
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(car y)))))))))
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(if (memq ?r switches) ; reverse sort order
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(setq file-alist (nreverse file-alist)))
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file-alist)
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;; From Roland McGrath. Can use this to sort on time.
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(defun ls-lisp-time-lessp (time0 time1)
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(let ((hi0 (car time0))
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(hi1 (car time1))
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(lo0 (car (cdr time0)))
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(lo1 (car (cdr time1))))
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(or (< hi0 hi1)
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(and (= hi0 hi1)
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(< lo0 lo1)))))
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(defun ls-lisp-format (file-name file-attr &optional switches)
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(let ((file-type (nth 0 file-attr)))
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(concat (if (memq ?i switches) ; inode number
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(format "%6d " (nth 10 file-attr)))
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;; nil is treated like "" in concat
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(if (memq ?s switches) ; size in K
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(format "%4d " (1+ (/ (nth 7 file-attr) 1024))))
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(nth 8 file-attr) ; permission bits
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;; numeric uid/gid are more confusing than helpful
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;; Emacs should be able to make strings of them.
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;; user-login-name and user-full-name could take an
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;; optional arg.
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(format " %3d %-8d %-8d %8d "
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(nth 1 file-attr) ; no. of links
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(nth 2 file-attr) ; uid
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(nth 3 file-attr) ; gid
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(nth 7 file-attr) ; size in bytes
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)
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(ls-lisp-format-time file-attr switches)
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" "
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file-name
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(if (stringp file-type) ; is a symbolic link
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(concat " -> " file-type)
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"")
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"\n"
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)))
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(defun ls-lisp-time-index (switches)
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;; Return index into file-attributes according to ls SWITCHES.
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(cond
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((memq ?c switches) 6) ; last mode change
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((memq ?u switches) 4) ; last access
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;; default is last modtime
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(t 5)))
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(defun ls-lisp-format-time (file-attr switches)
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;; Format time string for file with attributes FILE-ATTR according
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;; to SWITCHES (a list of ls option letters of which c and u are recognized).
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;; file-attributes's time is in a braindead format
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;; Emacs 19 can format it using a new optional argument to
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;; current-time-string, for Emacs 18 we just return the faked fixed
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;; date "Jan 00 00:00 ".
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(condition-case error-data
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(let* ((time (current-time-string
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(nth (ls-lisp-time-index switches) file-attr)))
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(date (substring time 4 11)) ; "Apr 30 "
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(clock (substring time 11 16)) ; "11:27"
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(year (substring time 19 24)) ; " 1992"
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(same-year (equal year (substring (current-time-string) 19 24))))
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(concat date ; has trailing SPC
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(if same-year
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;; this is not exactly the same test used by ls
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;; ls tests if the file is older than 6 months
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;; but we can't do time differences easily
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clock
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year)))
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(error
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"Jan 00 00:00")))
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(provide 'ls-lisp)
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; eof
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