X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/7d4a41dcd6ca8fd4b19c0f681f77df7677bee22b..6e0f362cb0a10f1a71fcc10ca8c979de4673217c:/lisp/ls-lisp.el diff --git a/lisp/ls-lisp.el b/lisp/ls-lisp.el index 3bb6e1d2e4..feadbb5e2b 100644 --- a/lisp/ls-lisp.el +++ b/lisp/ls-lisp.el @@ -1,16 +1,18 @@ -;;;; dired-lisp.el - emulate ls completely in Emacs Lisp. $Revision$ -;;;; Copyright (C) 1991 Sebastian Kremer +;;; ls-lisp.el --- emulate insert-directory completely in Emacs Lisp -;;;; READ THE WARNING BELOW BEFORE USING THIS PROGRAM! +;; Copyright (C) 1992, 1994, 2000, 2002, 2003, 2004, +;; 2005 Free Software Foundation, Inc. -;;;; Useful if you cannot afford to fork Emacs on a real memory UNIX, -;;;; under VMS, or if you don't have the ls program. +;; Author: Sebastian Kremer +;; Modified by: Francis J. Wright +;; 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 1, or (at your option) +;; 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, @@ -19,126 +21,580 @@ ;; 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. +;; along with GNU Emacs; see the file COPYING. If not, write to the +;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +;; Boston, MA 02110-1301, USA. -;;;; WARNING: +;;; Commentary: -;;;; I initially used file-name-all-completions instead of -;;;; directory-files and got an internal Emacs error: +;; OVERVIEW ========================================================== -;;;; Signalling: (wrong-type-argument natnump #) +;; 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. -;;;; It has never happened again and had no bad aftereffects, but do be -;;;; careful! +;; 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: -;;;; 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 +;; RESTRICTIONS ====================================================== -;;;; It is surprisingly fast, though! +;; * A few obscure ls switches are still ignored: see the docstring of +;; `insert-directory'. -;;;; TODO: -;;;; Recognize at least some ls switches: l R g F i +;; * Generally only numeric uid/gid. -(require 'dired) +;; TO DO ============================================================= -(or (fboundp 'tree-dired-ls) ; save original function definition - (fset 'tree-dired-ls (symbol-function 'dired-ls))) +;; Complete handling of F switch (if/when possible). -;; 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).") +;; 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! -(defun dired-ls (file &optional switches wildcard full-directory-p) - (funcall dired-ls-function file switches wildcard full-directory-p)) +;;; History: -(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) - "")) +;; Written originally by Sebastian Kremer +;; Revised by Andrew Innes and Geoff Volker (and maybe others). + +;; Modified by Francis J. Wright , mainly +;; to support many more ls options, "platform emulation", hooks for +;; external symbolic link support and more robust sorting. + +;;; Code: + +(eval-when-compile (require 'cl)) + +(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 + :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 + :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 + (not (memq system-type '(macos ms-dos windows-nt))) + "*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) + +;;; Autoloaded because it is let-bound in `recover-session', `mail-recover-1'. +;;;###autoload +(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) + +(defcustom ls-lisp-format-time-list + '("%b %e %H:%M" + "%b %e %Y") + "*List of `format-time-string' specs to display file time stamps. +They are used whenever a locale is not specified to use instead. + +Syntax: (EARLY-TIME-FORMAT OLD-TIME-FORMAT) + +The EARLY-TIME-FORMAT is used if file has been modified within the +current year. The OLD-TIME-FORMAT is used for older files. To use ISO +8601 dates, you could set: + +\(setq ls-lisp-format-time-list + '(\"%Y-%m-%d %H:%M\" + \"%Y-%m-%d \"))" + :type '(list (string :tag "Early time format") + (string :tag "Old time format")) + :group 'ls-lisp) + +(defvar original-insert-directory nil + "This holds the original function definition of `insert-directory'.") + +;; Remember the original insert-directory function +(or (featurep 'ls-lisp) ; FJW: unless this file is being reloaded! + (setq 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.maths.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) + + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(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 + (funcall 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)) + wildcard-regexp) + (if handler + (funcall handler 'insert-directory file switches + wildcard full-directory-p) + ;; Remove --dired switch + (if (string-match "--dired " switches) + (setq switches (replace-match "" nil nil switches))) + ;; Convert SWITCHES to a list of characters. + (setq switches (delete ?- (append switches nil))) + ;; 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 wildcard + (setq wildcard-regexp + (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-regexp "[^~]\\'"))) + (ls-lisp-insert-directory + file switches (ls-lisp-time-index switches) + wildcard-regexp full-directory-p) + ;; Try to insert the amount of free space. (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 + (goto-char (point-min)) + ;; First find the line to put it on. + (when (re-search-forward "^total" nil t) + (let ((available (get-free-disk-space "."))) + (when available + ;; Replace "total" with "total used", to avoid confusion. + (replace-match "total used in directory") + (end-of-line) + (insert " available " available))))))))) + +(defun ls-lisp-insert-directory + (file switches time-index wildcard-regexp 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-REGEXP 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." + (if (or wildcard-regexp 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-regexp t 'string)) + (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-regexp 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 'string))) + (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 recognized.] +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) + ;; uid can be a sting or an integer + (let ((uid (nth 2 file-attr))) + (format (if (stringp uid) " %-8s" " %-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)) + (let ((gid (nth 3 file-attr))) + (format (if (stringp gid) " %-8s" " %-8d") gid)))) + (ls-lisp-format-file-size file-size (memq ?h switches)) " " - (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 + (ls-lisp-format-time file-attr time-index now) " " - (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 + (propertize file-name 'dired-filename t) (if (stringp file-type) ; is a symbolic link - (concat " -> " file-type) - "") + (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))) +(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-time-to-seconds (time) + "Convert TIME to a floating point number." + (+ (* (car time) 65536.0) + (cadr time) + (/ (or (nth 2 time) 0) 1000000.0))) + +(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 + (diff (- (ls-lisp-time-to-seconds time) + (ls-lisp-time-to-seconds now))) + ;; Consider a time to be recent if it is within the past six + ;; months. A Gregorian year has 365.2425 * 24 * 60 * 60 == + ;; 31556952 seconds on the average, and half of that is 15778476. + ;; Write the constant explicitly to avoid roundoff error. + (past-cutoff -15778476)) ; half a Gregorian year + (condition-case nil + ;; Use traditional time format in the C or POSIX locale, + ;; ISO-style time format otherwise, so columns line up. + (let ((locale system-time-locale)) + (if (not locale) + (let ((vars '("LC_ALL" "LC_TIME" "LANG"))) + (while (and vars (not (setq locale (getenv (car vars))))) + (setq vars (cdr vars))))) + (if (member locale '("C" "POSIX")) + (setq locale nil)) + (format-time-string + (if (and (<= past-cutoff diff) (<= diff 0)) + (if locale "%m-%d %H:%M" (nth 0 ls-lisp-format-time-list)) + (if locale "%Y-%m-%d " (nth 1 ls-lisp-format-time-list))) + time)) + (error "Unk 0 0000")))) + +(defun ls-lisp-format-file-size (file-size human-readable) + (if (or (not human-readable) + (< file-size 1024)) + (format (if (floatp file-size) " %8.0f" " %8d") file-size) + (do ((file-size (/ file-size 1024.0) (/ file-size 1024.0)) + ;; kilo, mega, giga, tera, peta, exa + (post-fixes (list "k" "M" "G" "T" "P" "E") (cdr post-fixes))) + ((< file-size 1024) (format " %7.0f%s" file-size (car post-fixes)))))) + +(provide 'ls-lisp) + +;;; arch-tag: e55f399b-05ec-425c-a6d5-f5e349c35ab4 +;;; ls-lisp.el ends here