-;;;; dired-lisp.el - emulate ls completely in Emacs Lisp
-;;;; Copyright (C) 1990 Sebastian Kremer
-
-;;;; Useful if you cannot afford to fork Emacs on a real memory UNIX,
-;;;; under VMS, or if you don't have the ls program.
-
-;; 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.
-
-;;;; WARNING:
-
-;;;; I initially used file-name-all-completions instead of
-;;;; directory-files and got an internal Emacs error:
-
-;;;; Signalling: (wrong-type-argument natnump #<EMACS BUG: ILLEGAL
-;;;; DATATYPE (#o37777777727) Save your buffers immediately and please
-;;;; report this bug>)
-
-;;;; It has never happened again and had no bad aftereffects, but do be
-;;;; careful!
-
-;;; RESTRICTIONS:
-;;;; Always sorts by name (ls switches are completely ignored for now)
-;;;; Cannot display date of file, displays a fake date "Jan 00 00:00" instead
-;;;; Only numeric uid/gid
-
-;;;; It is surprisingly fast, though!
-
-;;;; TODO:
-;;;; Recognize at least some ls switches: l R g F i
-
-(require 'dired)
-
-(or (fboundp 'tree-dired-ls) ; save original function definition
- (fset 'tree-dired-ls (symbol-function 'dired-ls)))
-
-;; perhaps buffer-local (he he)
-(defvar dired-ls-function 'dired-lisp-ls
- "*Function dired uses to obtain ls output.
-Possible values 'tree-dired-ls and 'dired-lisp-ls.
-Arglist is (FILE &optional SWITCHES WILDCARD FULL-DIRECTORY-P).")
-
-(defun dired-ls (file &optional switches wildcard full-directory-p)
- (funcall dired-ls-function file switches wildcard full-directory-p))
-
-(defun dired-lisp-ls (file &optional switches wildcard full-directory-p)
-; "Insert ls output of FILE, optionally formatted with SWITCHES.
-;Optional third arg WILDCARD means treat FILE as shell wildcard.
-;Optional fourth arg FULL-DIRECTORY-P means file is a directory and
-;switches do not contain `d'.
-;
-;SWITCHES default to dired-listing-switches."
- (or switches (setq switches dired-listing-switches))
- (if wildcard
- (error "Cannot handle wildcards in lisp emulation of `ls'."))
- (if full-directory-p
- (let* ((dir (file-name-as-directory file))
- (start (length dir))
- (sum 0))
- (insert "total \007\n") ; fill in afterwards
- (insert
- (mapconcat
- (function (lambda (short)
- (let* ((fil (concat dir short))
- (attr (file-attributes fil))
- (size (nth 7 attr)))
- ;;(debug)
- (setq sum (+ sum size))
- (dired-lisp-format
- ;;(file-name-nondirectory fil)
- ;;(dired-make-relative fil dir)
- ;;(substring fil start)
- short
- attr
- switches))))
- (directory-files dir)
- ""))
- (save-excursion
- (search-backward "total \007")
- (goto-char (match-end 0))
- (delete-char -1)
- (insert (format "%d" sum)))
- )
- ;; if not full-directory-p, FILE *must not* end in /, as
- ;; file-attributes will not recognize a symlink to a directory
- ;; must make it a relative filename as ls does:
- (setq file (file-name-nondirectory file))
- (insert (dired-lisp-format file (file-attributes file) switches)))
- )
-
-(defun dired-lisp-format (file-name file-attr &optional switches)
- (let ((file-type (nth 0 file-attr)))
- (concat (nth 8 file-attr) ; permission bits
- " "
- (dired-lisp-pad (nth 1 file-attr) -3) ; no. of links
- ;; numeric uid/gid are more confusing than helpful
- ;; Emacs should be able to make strings of them
- " " (dired-lisp-pad (nth 2 file-attr) -6) ; uid
- " " (dired-lisp-pad (nth 3 file-attr) -6) ; gid
- " "
- (dired-lisp-pad (nth 7 file-attr) -8) ; size in bytes
- ;; file-attributes's time is in a braindead format
- ;; Emacs should have a ctime function
- " " "Jan 00 00:00 " ; fake time
- file-name
- (if (stringp file-type) ; is a symbolic link
- (concat " -> " file-type)
- "")
- "\n"
- )))
-
-;; format should really do anything printf can!!
-(defun dired-lisp-pad (arg width &optional pad-char)
- "Pad ARG to WIDTH, from left if WIDTH < 0.
-Non-nil third arg optional PAD-CHAR defaults to a space."
- (or pad-char (setq pad-char ?\040))
- (if (integerp arg)
- (setq arg (int-to-string arg)))
- (let (l pad reverse)
- (if (< width 0)
- (setq reverse t
- width (- width)))
- (setq l (length arg)
- pad (- width l))
- (if (> pad 0)
- (if reverse
- (concat (make-string pad pad-char) arg)
- (concat arg (make-string pad pad-char)))
- arg)))
+;;; ls-lisp.el --- emulate insert-directory completely in Emacs Lisp
+
+;; Copyright (C) 1992, 1994, 2000 Free Software Foundation, Inc.
+
+;; Author: Sebastian Kremer <sk@thp.uni-koeln.de>
+;; Modified by: Francis J. Wright <F.J.Wright@maths.qmw.ac.uk>
+;; Maintainer: FSF
+;; Keywords: unix, dired
+
+;; 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:
+
+;; OVERVIEW ==========================================================
+
+;; This file redefines the function `insert-directory' to implement it
+;; directly from Emacs lisp, without running ls in a subprocess. It
+;; is useful if you cannot afford to fork Emacs on a real memory UNIX,
+;; under VMS or other non-UNIX platforms if you don't have the ls
+;; program, or if you want a different format from what ls offers.
+
+;; This function can use regexps instead of shell wildcards. If you
+;; enter regexps remember to double each $ sign. For example, to
+;; include files *.el, enter `.*\.el$$', resulting in the regexp
+;; `.*\.el$'.
+
+;; RESTRICTIONS ======================================================
+
+;; * A few obscure ls switches are still ignored: see the docstring of
+;; `insert-directory'.
+
+;; * Generally only numeric uid/gid.
+
+;; TO DO =============================================================
+
+;; Complete handling of F switch (if/when possible).
+
+;; FJW: May be able to sort much faster by consing the sort key onto
+;; the front of each list element, sorting and then stripping the key
+;; off again!
+
+;;; History:
+
+;; Written originally by Sebastian Kremer <sk@thp.uni-koeln.de>
+;; Revised by Andrew Innes and Geoff Volker (and maybe others).
+
+;; Modified by Francis J. Wright <F.J.Wright@maths.qmw.ac.uk>, mainly
+;; to support many more ls options, "platform emulation", hooks for
+;; external symbolic link support and more robust sorting.
+
+;;; Code:
+
+;;;###autoload
+(defgroup ls-lisp nil
+ "Emulate the ls program completely in Emacs Lisp."
+ :version "21.1"
+ :group 'dired)
+
+(defcustom ls-lisp-emulation
+ (cond ((eq system-type 'macos) 'MacOS)
+ ;; ((eq system-type 'windows-nt) 'MS-Windows)
+ ((memq system-type
+ '(hpux dgux usg-unix-v unisoft-unix rtu irix berkeley-unix))
+ 'UNIX)) ; very similar to GNU
+ ;; Anything else defaults to nil, meaning GNU.
+ "*Platform to emulate: GNU (default), MacOS, MS-Windows, UNIX.
+Corresponding value is one of the atoms: nil, MacOS, MS-Windows, UNIX.
+Sets default values for: `ls-lisp-ignore-case', `ls-lisp-dirs-first',
+`ls-lisp-verbosity'. Need not match actual platform. Changing this
+option will have no effect until you restart Emacs."
+ :type '(choice (const :tag "GNU" nil)
+ (const MacOS)
+ (const MS-Windows)
+ (const UNIX))
+ :group 'ls-lisp)
+
+(defcustom ls-lisp-ignore-case
+ ;; Name change for consistency with other option names.
+ (or (memq ls-lisp-emulation '(MS-Windows MacOS))
+ (and (boundp 'ls-lisp-dired-ignore-case) ls-lisp-dired-ignore-case))
+ "*Non-nil causes ls-lisp alphabetic sorting to ignore case."
+ :type 'boolean
+ :group 'ls-lisp)
+
+(defcustom ls-lisp-dirs-first (eq ls-lisp-emulation 'MS-Windows)
+ "*Non-nil causes ls-lisp to sort directories first in any ordering.
+\(Or last if it is reversed.) Follows Microsoft Windows Explorer."
+ ;; Functionality suggested by Chris McMahan <cmcmahan@one.net>
+ :type 'boolean
+ :group 'ls-lisp)
+
+(defcustom ls-lisp-verbosity
+ (cond ((eq ls-lisp-emulation 'MacOS) nil)
+ ((eq ls-lisp-emulation 'MS-Windows)
+ (if (and (fboundp 'w32-using-nt) (w32-using-nt))
+ '(links))) ; distinguish NT/2K from 9x
+ ((eq ls-lisp-emulation 'UNIX) '(links uid)) ; UNIX ls
+ (t '(links uid gid))) ; GNU ls
+ "*A list of optional file attributes that ls-lisp should display.
+It should contain none or more of the symbols: links, uid, gid.
+Nil (or an empty list) means display none of them.
+
+Concepts come from UNIX: `links' means count of names associated with
+the file\; `uid' means user (owner) identifier\; `gid' means group
+identifier.
+
+If emulation is MacOS then default is nil\;
+if emulation is MS-Windows then default is `(links)' if platform is
+Windows NT/2K, nil otherwise\;
+if emulation is UNIX then default is `(links uid)'\;
+if emulation is GNU then default is `(links uid gid)'."
+ ;; Functionality suggested by Howard Melman <howard@silverstream.com>
+ :type '(set (const :tag "Show Link Count" links)
+ (const :tag "Show User" uid)
+ (const :tag "Show Group" gid))
+ :group 'ls-lisp)
+
+(defcustom ls-lisp-use-insert-directory-program nil
+ "*Non-nil causes ls-lisp to revert back to using `insert-directory-program'.
+This is useful on platforms where ls-lisp is dumped into Emacs, such as
+Microsoft Windows, but you would still like to use a program to list
+the contents of a directory."
+ :type 'boolean
+ :group 'ls-lisp)
+
+(defcustom ls-lisp-support-shell-wildcards t
+ "*Non-nil means ls-lisp treats file patterns as shell wildcards.
+Otherwise they are treated as Emacs regexps (for backward compatibility)."
+ :type 'boolean
+ :group 'ls-lisp)
+
+;; Remember the original insert-directory function
+(or (featurep 'ls-lisp) ; FJW: unless this file is being reloaded!
+ (fset 'original-insert-directory (symbol-function 'insert-directory)))
+
+;; This stub is to allow ls-lisp to parse symbolic links via another
+;; library such as w32-symlinks.el from
+;; http://centaur.qmw.ac.uk/Emacs/:
+(defun ls-lisp-parse-symlink (file-name)
+ "This stub may be redefined to parse FILE-NAME as a symlink.
+It should return nil or the link target as a string."
+ nil)
+
+\f
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun insert-directory (file switches &optional wildcard full-directory-p)
+ "Insert directory listing for FILE, formatted according to SWITCHES.
+Leaves point after the inserted text.
+SWITCHES may be a string of options, or a list of strings.
+Optional third arg WILDCARD means treat FILE as shell wildcard.
+Optional fourth arg FULL-DIRECTORY-P means file is a directory and
+switches do not contain `d', so that a full listing is expected.
+
+This version of the function comes from `ls-lisp.el'.
+If the value of `ls-lisp-use-insert-directory-program' is non-nil then
+it works exactly like the version from `files.el' and runs a directory
+listing program whose name is in the variable
+`insert-directory-program'; if also WILDCARD is non-nil then it runs
+the shell specified by `shell-file-name'. If the value of
+`ls-lisp-use-insert-directory-program' is nil then it runs a Lisp
+emulation.
+
+The Lisp emulation does not run any external programs or shells. It
+supports ordinary shell wildcards if `ls-lisp-support-shell-wildcards'
+is non-nil; otherwise, it interprets wildcards as regular expressions
+to match file names. It does not support all `ls' switches -- those
+that work are: A a c i r S s t u U X g G B C R and F partly."
+ (if ls-lisp-use-insert-directory-program
+ (original-insert-directory file switches wildcard full-directory-p)
+ ;; We need the directory in order to find the right handler.
+ (let ((handler (find-file-name-handler (expand-file-name file)
+ 'insert-directory)))
+ (if handler
+ (funcall handler 'insert-directory file switches
+ wildcard full-directory-p)
+ ;; Convert SWITCHES to a list of characters.
+ (setq switches (delete ?- (append switches nil)))
+ (if wildcard
+ (setq wildcard
+ (if ls-lisp-support-shell-wildcards
+ (wildcard-to-regexp (file-name-nondirectory file))
+ (file-name-nondirectory file))
+ file (file-name-directory file))
+ (if (memq ?B switches) (setq wildcard "[^~]\\'")))
+ (ls-lisp-insert-directory
+ file switches (ls-lisp-time-index switches)
+ wildcard full-directory-p)))))
+
+(defun ls-lisp-insert-directory
+ (file switches time-index wildcard full-directory-p)
+ "Insert directory listing for FILE, formatted according to SWITCHES.
+Leaves point after the inserted text. This is an internal function
+optionally called by the `ls-lisp.el' version of `insert-directory'.
+It is called recursively if the -R switch is used.
+SWITCHES is a *list* of characters. TIME-INDEX is the time index into
+file-attributes according to SWITCHES. WILDCARD is nil or an *Emacs
+regexp*. FULL-DIRECTORY-P means file is a directory and SWITCHES does
+not contain `d', so that a full listing is expected."
+ ;; Sometimes we get ".../foo*/" as FILE. While the shell and
+ ;; `ls' don't mind, we certainly do, because it makes us think
+ ;; there is no wildcard, only a directory name.
+ (if (and ls-lisp-support-shell-wildcards
+ (string-match "[[?*]" file))
+ (progn
+ (or (not (eq (aref file (1- (length file))) ?/))
+ (setq file (substring file 0 (1- (length file)))))
+ (setq wildcard t)))
+ (if (or wildcard full-directory-p)
+ (let* ((dir (file-name-as-directory file))
+ (default-directory dir) ; so that file-attributes works
+ (file-alist
+ (directory-files-and-attributes dir nil wildcard t))
+ (now (current-time))
+ (sum 0)
+ ;; do all bindings here for speed
+ total-line files elt short file-size fil attr)
+ (cond ((memq ?A switches)
+ (setq file-alist
+ (ls-lisp-delete-matching "^\\.\\.?$" file-alist)))
+ ((not (memq ?a switches))
+ ;; if neither -A nor -a, flush . files
+ (setq file-alist
+ (ls-lisp-delete-matching "^\\." file-alist))))
+ (setq file-alist
+ (ls-lisp-handle-switches file-alist switches))
+ (if (memq ?C switches) ; column (-C) format
+ (ls-lisp-column-format file-alist)
+ (setq total-line (cons (point) (car-safe file-alist)))
+ (setq files file-alist)
+ (while files ; long (-l) format
+ (setq elt (car files)
+ files (cdr files)
+ short (car elt)
+ attr (cdr elt)
+ file-size (nth 7 attr))
+ (and attr
+ (setq sum (+ file-size
+ ;; Even if neither SUM nor file's size
+ ;; overflow, their sum could.
+ (if (or (< sum (- 134217727 file-size))
+ (floatp sum)
+ (floatp file-size))
+ sum
+ (float sum))))
+ (insert (ls-lisp-format short attr file-size
+ switches time-index now))))
+ ;; Insert total size of all files:
+ (save-excursion
+ (goto-char (car total-line))
+ (or (cdr total-line)
+ ;; Shell says ``No match'' if no files match
+ ;; the wildcard; let's say something similar.
+ (insert "(No match)\n"))
+ (insert (format "total %.0f\n" (fceiling (/ sum 1024.0))))))
+ (if (memq ?R switches)
+ ;; List the contents of all directories recursively.
+ ;; cadr of each element of `file-alist' is t for
+ ;; directory, string (name linked to) for symbolic
+ ;; link, or nil.
+ (while file-alist
+ (setq elt (car file-alist)
+ file-alist (cdr file-alist))
+ (when (and (eq (cadr elt) t) ; directory
+ (not (string-match "\\`\\.\\.?\\'" (car elt))))
+ (setq elt (expand-file-name (car elt) dir))
+ (insert "\n" elt ":\n")
+ (ls-lisp-insert-directory
+ elt switches time-index wildcard full-directory-p)))))
+ ;; If not full-directory-p, FILE *must not* end in /, as
+ ;; file-attributes will not recognize a symlink to a directory,
+ ;; so must make it a relative filename as ls does:
+ (if (eq (aref file (1- (length file))) ?/)
+ (setq file (substring file 0 -1)))
+ (let ((fattr (file-attributes file)))
+ (if fattr
+ (insert (ls-lisp-format file fattr (nth 7 fattr)
+ switches time-index (current-time)))
+ (message "%s: doesn't exist or is inaccessible" file)
+ (ding) (sit-for 2))))) ; to show user the message!
+
+(defun ls-lisp-column-format (file-alist)
+ "Insert the file names (only) in FILE-ALIST into the current buffer.
+Format in columns, sorted vertically, following GNU ls -C.
+Responds to the window width as ls should but may not!"
+ (let (files fmt ncols collen (nfiles 0) (colwid 0))
+ ;; Count number of files as `nfiles', build list of filenames as
+ ;; `files', and find maximum filename length as `colwid':
+ (let (file len)
+ (while file-alist
+ (setq nfiles (1+ nfiles)
+ file (caar file-alist)
+ files (cons file files)
+ file-alist (cdr file-alist)
+ len (length file))
+ (if (> len colwid) (setq colwid len))))
+ (setq files (nreverse files)
+ colwid (+ 2 colwid) ; 2 character column gap
+ fmt (format "%%-%ds" colwid) ; print format
+ ncols (/ (window-width) colwid) ; no of columns
+ collen (/ nfiles ncols)) ; floor of column length
+ (if (> nfiles (* collen ncols)) (setq collen (1+ collen)))
+ ;; Output the file names in columns, sorted vertically:
+ (let ((i 0) j)
+ (while (< i collen)
+ (setq j i)
+ (while (< j nfiles)
+ (insert (format fmt (nth j files)))
+ (setq j (+ j collen)))
+ ;; FJW: This is completely unnecessary, but I don't like
+ ;; trailing white space...
+ (delete-region (point) (progn (skip-chars-backward " \t") (point)))
+ (insert ?\n)
+ (setq i (1+ i))))))
+
+(defun ls-lisp-delete-matching (regexp list)
+ "Delete all elements matching REGEXP from LIST, return new list."
+ ;; Should perhaps use setcdr for efficiency.
+ (let (result)
+ (while list
+ (or (string-match regexp (caar list))
+ (setq result (cons (car list) result)))
+ (setq list (cdr list)))
+ result))
+
+(defsubst ls-lisp-string-lessp (s1 s2)
+ "Return t if string S1 is less than string S2 in lexicographic order.
+Case is significant if `ls-lisp-ignore-case' is nil.
+Unibyte strings are converted to multibyte for comparison."
+ (let ((u (compare-strings s1 0 nil s2 0 nil ls-lisp-ignore-case)))
+ (and (numberp u) (< u 0))))
+
+(defun ls-lisp-handle-switches (file-alist switches)
+ "Return new FILE-ALIST sorted according to SWITCHES.
+SWITCHES is a list of characters. Default sorting is alphabetic."
+ ;; FILE-ALIST's elements are (FILE . FILE-ATTRIBUTES).
+ (or (memq ?U switches) ; unsorted
+ ;; Catch and ignore unexpected sorting errors
+ (condition-case err
+ (setq file-alist
+ (let (index)
+ ;; Copy file-alist in case of error
+ (sort (copy-sequence file-alist) ; modifies its argument!
+ (cond ((memq ?S switches)
+ (lambda (x y) ; sorted on size
+ ;; 7th file attribute is file size
+ ;; Make largest file come first
+ (< (nth 7 (cdr y))
+ (nth 7 (cdr x)))))
+ ((setq index (ls-lisp-time-index switches))
+ (lambda (x y) ; sorted on time
+ (ls-lisp-time-lessp (nth index (cdr y))
+ (nth index (cdr x)))))
+ ((memq ?X switches)
+ (lambda (x y) ; sorted on extension
+ (ls-lisp-string-lessp
+ (ls-lisp-extension (car x))
+ (ls-lisp-extension (car y)))))
+ (t
+ (lambda (x y) ; sorted alphabetically
+ (ls-lisp-string-lessp (car x) (car y))))))))
+ (error (message "Unsorted (ls-lisp sorting error) - %s"
+ (error-message-string err))
+ (ding) (sit-for 2)))) ; to show user the message!
+ (if (memq ?F switches) ; classify switch
+ (setq file-alist (mapcar 'ls-lisp-classify file-alist)))
+ (if ls-lisp-dirs-first
+ ;; Re-sort directories first, without otherwise changing the
+ ;; ordering, and reverse whole list. cadr of each element of
+ ;; `file-alist' is t for directory, string (name linked to) for
+ ;; symbolic link, or nil.
+ (let (el dirs files)
+ (while file-alist
+ (if (eq (cadr (setq el (car file-alist))) t) ; directory
+ (setq dirs (cons el dirs))
+ (setq files (cons el files)))
+ (setq file-alist (cdr file-alist)))
+ (setq file-alist
+ (if (memq ?U switches) ; unsorted order is reversed
+ (nconc dirs files)
+ (nconc files dirs)
+ ))))
+ ;; Finally reverse file alist if necessary.
+ ;; (eq below MUST compare `(not (memq ...))' to force comparison of
+ ;; `t' or `nil', rather than list tails!)
+ (if (eq (eq (not (memq ?U switches)) ; unsorted order is reversed
+ (not (memq ?r switches))) ; reversed sort order requested
+ ls-lisp-dirs-first) ; already reversed
+ (nreverse file-alist)
+ file-alist))
+
+(defun ls-lisp-classify (filedata)
+ "Append a character to each file name indicating the file type.
+Also, for regular files that are executable, append `*'.
+The file type indicators are `/' for directories, `@' for symbolic
+links, `|' for FIFOs, `=' for sockets, and nothing for regular files.
+\[But FIFOs and sockets are not recognised.]
+FILEDATA has the form (filename . `file-attributes'). Its `cadr' is t
+for directory, string (name linked to) for symbolic link, or nil."
+ (let ((dir (cadr filedata)) (file-name (car filedata)))
+ (cond ((or dir
+ ;; Parsing .lnk files here is perhaps overkill!
+ (setq dir (ls-lisp-parse-symlink file-name)))
+ (cons
+ (concat file-name (if (eq dir t) "/" "@"))
+ (cdr filedata)))
+ ((string-match "x" (nth 9 filedata))
+ (cons
+ (concat file-name "*")
+ (cdr filedata)))
+ (t filedata))))
+
+(defun ls-lisp-extension (filename)
+ "Return extension of FILENAME (ignoring any version extension)
+FOLLOWED by null and full filename, SOLELY for full alpha sort."
+ ;; Force extension sort order: `no ext' then `null ext' then `ext'
+ ;; to agree with GNU ls.
+ (concat
+ (let* ((i (length filename)) end)
+ (if (= (aref filename (1- i)) ?.) ; null extension
+ "\0"
+ (while (and (>= (setq i (1- i)) 0)
+ (/= (aref filename i) ?.)))
+ (if (< i 0) "\0\0" ; no extension
+ (if (/= (aref filename (1+ i)) ?~)
+ (substring filename (1+ i))
+ ;; version extension found -- ignore it
+ (setq end i)
+ (while (and (>= (setq i (1- i)) 0)
+ (/= (aref filename i) ?.)))
+ (if (< i 0) "\0\0" ; no extension
+ (substring filename (1+ i) end))))
+ )) "\0" filename))
+
+;; From Roland McGrath. Can use this to sort on time.
+(defun ls-lisp-time-lessp (time0 time1)
+ "Return t if time TIME0 is earlier than time TIME1."
+ (let ((hi0 (car time0)) (hi1 (car time1)))
+ (or (< hi0 hi1)
+ (and (= hi0 hi1)
+ (< (cadr time0) (cadr time1))))))
+
+(defun ls-lisp-format (file-name file-attr file-size switches time-index now)
+ "Format one line of long ls output for file FILE-NAME.
+FILE-ATTR and FILE-SIZE give the file's attributes and size.
+SWITCHES, TIME-INDEX and NOW give the full switch list and time data."
+ (let ((file-type (nth 0 file-attr))
+ ;; t for directory, string (name linked to)
+ ;; for symbolic link, or nil.
+ (drwxrwxrwx (nth 8 file-attr))) ; attribute string ("drwxrwxrwx")
+ (and (null file-type)
+ ;; Maybe no kernel support for symlinks, so...
+ (setq file-type (ls-lisp-parse-symlink file-name))
+ (aset drwxrwxrwx 0 ?l)) ; symbolic link - update attribute string
+ (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 " %4.0f" (fceiling (/ file-size 1024.0))))
+ drwxrwxrwx ; attribute string
+ (if (memq 'links ls-lisp-verbosity)
+ (format " %3d" (nth 1 file-attr))) ; link count
+ ;; Numeric uid/gid are more confusing than helpful;
+ ;; Emacs should be able to make strings of them.
+ ;; They tend to be bogus on non-UNIX platforms anyway so
+ ;; optionally hide them.
+ (if (memq 'uid ls-lisp-verbosity)
+ ;; (user-login-name uid) works on Windows NT but not
+ ;; on 9x and maybe not on some other platforms, so...
+ (let ((uid (nth 2 file-attr)))
+ (if (= uid (user-uid))
+ (format " %-8s" (user-login-name))
+ (format " %-8d" uid))))
+ (if (not (memq ?G switches)) ; GNU ls -- shows group by default
+ (if (or (memq ?g switches) ; UNIX ls -- no group by default
+ (memq 'gid ls-lisp-verbosity))
+ (if (memq system-type '(macos windows-nt ms-dos))
+ ;; No useful concept of group...
+ " root"
+ (let* ((gid (nth 3 file-attr))
+ (group (user-login-name gid)))
+ (if group
+ (format " %-8s" group)
+ (format " %-8d" gid))))))
+ (format (if (floatp file-size) " %8.0f" " %8d") file-size)
+ " "
+ (ls-lisp-format-time file-attr time-index now)
+ " "
+ file-name
+ (if (stringp file-type) ; is a symbolic link
+ (concat " -> " file-type))
+ "\n"
+ )))
+
+(defun ls-lisp-time-index (switches)
+ "Return time index into file-attributes according to ls SWITCHES list.
+Return nil if no time switch found."
+ ;; FJW: Default of nil is IMPORTANT and used in `ls-lisp-handle-switches'!
+ (cond ((memq ?c switches) 6) ; last mode change
+ ((memq ?t switches) 5) ; last modtime
+ ((memq ?u switches) 4))) ; last access
+
+(defun ls-lisp-format-time (file-attr time-index now)
+ "Format time for file with attributes FILE-ATTR according to TIME-INDEX.
+Use the same method as ls to decide whether to show time-of-day or year,
+depending on distance between file date and NOW.
+All ls time options, namely c, t and u, are handled."
+ (let* ((time (nth (or time-index 5) file-attr)) ; default is last modtime
+ (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
+ (condition-case nil
+ (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)
+ (error "Unk 0 0000"))))
+
+(provide 'ls-lisp)
+
+;;; ls-lisp.el ends here
HCoop / bpt / emacs.git / blobdiff