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emacs/lisp/ls-lisp.el
Juanma Barranquero 06b605171f lisp/*.el: Lexical-binding cleanup.
2011-04-19 15:44:55 +02:00

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;;; ls-lisp.el --- emulate insert-directory completely in Emacs Lisp
;; Copyright (C) 1992, 1994, 2000-2011 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
;; Package: emacs
;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; 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,
;; 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'.
;; 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" and more
;; robust sorting.
;;; Code:
(defgroup ls-lisp nil
"Emulate the ls program completely in Emacs Lisp."
:version "21.1"
:group 'dired)
(defun ls-lisp-set-options ()
"Reset the ls-lisp options that depend on `ls-lisp-emulation'."
(mapc 'custom-reevaluate-setting
'(ls-lisp-ignore-case ls-lisp-dirs-first ls-lisp-verbosity)))
(defcustom ls-lisp-emulation
(cond ;; ((eq system-type 'windows-nt) 'MS-Windows)
((memq system-type '(hpux usg-unix-v 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: nil, `MacOS', `MS-Windows', `UNIX'.
Set this to your preferred value; it need not match the actual platform
you are using.
This variable does not affect the behavior of ls-lisp directly.
Rather, it controls the default values for some variables that do:
`ls-lisp-ignore-case', `ls-lisp-dirs-first', and `ls-lisp-verbosity'.
If you change this variable directly (without using customize)
after loading `ls-lisp', you should use `ls-lisp-set-options' to
update the dependent variables."
:type '(choice (const :tag "GNU" nil)
(const MacOS)
(const MS-Windows)
(const UNIX))
:initialize 'custom-initialize-default
:set (lambda (symbol value)
(unless (equal value (eval symbol))
(custom-set-default symbol value)
(ls-lisp-set-options)))
:group 'ls-lisp)
;; Only made an obsolete alias in 23.3. Before that, the initial
;; value was set according to:
;; (or (memq ls-lisp-emulation '(MS-Windows MacOS))
;; (and (boundp 'ls-lisp-dired-ignore-case) ls-lisp-dired-ignore-case))
;; Which isn't the right thing to do.
(define-obsolete-variable-alias 'ls-lisp-dired-ignore-case
'ls-lisp-ignore-case "21.1")
(defcustom ls-lisp-ignore-case
(memq ls-lisp-emulation '(MS-Windows MacOS))
"Non-nil causes ls-lisp alphabetic sorting to ignore case."
:set-after '(ls-lisp-emulation)
: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>
:set-after '(ls-lisp-emulation)
: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.
A value of 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)'."
:set-after '(ls-lisp-emulation)
;; 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
(not (memq system-type '(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.
These specs are used ONLY if a valid locale can not be determined.
If `ls-lisp-use-localized-time-format' is non-nil, these specs are used
regardless of whether the locale can be determined.
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)
(defcustom ls-lisp-use-localized-time-format nil
"Non-nil means to always use `ls-lisp-format-time-list' for time stamps.
This applies even if a valid locale is specified.
WARNING: Using localized date/time format might cause Dired columns
to fail to line up, e.g. if month names are not all of the same length."
:type 'boolean
:group 'ls-lisp)
(defvar original-insert-directory nil
"This holds the original function definition of `insert-directory'.")
(defvar ls-lisp-uid-d-fmt "-%d"
"Format to display integer UIDs.")
(defvar ls-lisp-uid-s-fmt "-%s"
"Format to display user names.")
(defvar ls-lisp-gid-d-fmt "-%d"
"Format to display integer GIDs.")
(defvar ls-lisp-gid-s-fmt "-%s"
"Format to display user group names.")
(defvar ls-lisp-filesize-d-fmt "%d"
"Format to display integer file sizes.")
(defvar ls-lisp-filesize-f-fmt "%.0f"
"Format to display float file sizes.")
;; 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)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(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 B C c F G g h i n R r S s t U u X. The l switch
is assumed to be always present and cannot be turned off."
(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))
(orig-file file)
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 ?\ (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)
;; Prefer an existing file to wildcards, like
;; dired-noselect does.
(not (file-exists-p 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 "[^~]\\'")))
(condition-case err
(ls-lisp-insert-directory
file switches (ls-lisp-time-index switches)
wildcard-regexp full-directory-p)
(invalid-regexp
;; Maybe they wanted a literal file that just happens to
;; use characters special to shell wildcards.
(if (equal (cadr err) "Unmatched [ or [^")
(progn
(setq wildcard-regexp (if (memq ?B switches) "[^~]\\'")
file (file-relative-name orig-file))
(ls-lisp-insert-directory
file switches (ls-lisp-time-index switches)
nil full-directory-p))
(signal (car err) (cdr err)))))
;; Try to insert the amount of free space.
(save-excursion
(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
(if (memq ?n switches)
'integer
'string)))
(sum 0)
(max-uid-len 0)
(max-gid-len 0)
(max-file-size 0)
;; do all bindings here for speed
total-line files elt short file-size attr
fuid fgid uid-len gid-len)
(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)))
;; Find the appropriate format for displaying uid, gid, and
;; file size, by finding the longest strings among all the
;; files we are about to display.
(dolist (elt file-alist)
(setq attr (cdr elt)
fuid (nth 2 attr)
uid-len (if (stringp fuid) (string-width fuid)
(length (format "%d" fuid)))
fgid (nth 3 attr)
gid-len (if (stringp fgid) (string-width fgid)
(length (format "%d" fgid)))
file-size (nth 7 attr))
(if (> uid-len max-uid-len)
(setq max-uid-len uid-len))
(if (> gid-len max-gid-len)
(setq max-gid-len gid-len))
(if (> file-size max-file-size)
(setq max-file-size file-size)))
(setq ls-lisp-uid-d-fmt (format " %%-%dd" max-uid-len))
(setq ls-lisp-uid-s-fmt (format " %%-%ds" max-uid-len))
(setq ls-lisp-gid-d-fmt (format " %%-%dd" max-gid-len))
(setq ls-lisp-gid-s-fmt (format " %%-%ds" max-gid-len))
(setq ls-lisp-filesize-d-fmt
(format " %%%dd"
(if (memq ?s switches)
(length (format "%.0f"
(fceiling (/ max-file-size 1024.0))))
(length (format "%.0f" max-file-size)))))
(setq ls-lisp-filesize-f-fmt
(format " %%%d.0f"
(if (memq ?s switches)
(length (format "%.0f"
(fceiling (/ max-file-size 1024.0))))
(length (format "%.0f" max-file-size)))))
(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))))
;; 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
;; Under -F, we have already decorated all
;; directories, including "." and "..", with
;; a /, so allow for that as well.
(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 (file-name-absolute-p file) (setq file (expand-file-name file)))
(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
(if (memq ?F switches)
(ls-lisp-classify-file file fattr)
file)
fattr (nth 7 fattr)
switches time-index))
(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
(time-less-p (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 (or (eq (cadr (setq el (car file-alist))) t) ; directory
(and (stringp (cadr el))
(file-directory-p (cadr el)))) ; symlink to a 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-file (filename fattr)
"Append a character to FILENAME indicating the file type.
FATTR is the file attributes returned by `file-attributes' for the file.
The file type indicators are `/' for directories, `@' for symbolic
links, `|' for FIFOs, `=' for sockets, `*' for regular files that
are executable, and nothing for other types of files."
(let* ((type (car fattr))
(modestr (nth 8 fattr))
(typestr (substring modestr 0 1)))
(cond
(type
(concat filename (if (eq type t) "/" "@")))
((string-match "x" modestr)
(concat filename "*"))
((string= "p" typestr)
(concat filename "|"))
((string= "s" typestr)
(concat filename "="))
(t filename))))
(defun ls-lisp-classify (filedata)
"Append a character to file name in FILEDATA indicating the file type.
FILEDATA has the form (FILENAME . ATTRIBUTES), where ATTRIBUTES is the
structure returned by `file-attributes' for that file.
The file type indicators are `/' for directories, `@' for symbolic
links, `|' for FIFOs, `=' for sockets, `*' for regular files that
are executable, and nothing for other types of files."
(let ((file-name (car filedata))
(fattr (cdr filedata)))
(setq file-name (propertize file-name 'dired-filename t))
(cons (ls-lisp-classify-file file-name fattr) fattr)))
(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))
(defun ls-lisp-format (file-name file-attr file-size switches time-index)
"Format one line of long ls output for file FILE-NAME.
FILE-ATTR and FILE-SIZE give the file's attributes and size.
SWITCHES and TIME-INDEX 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")
(concat (if (memq ?i switches) ; inode number
(let ((inode (nth 10 file-attr)))
(if (consp inode)
(if (consp (cdr inode))
;; 2^(24+16) = 1099511627776.0, but
;; multiplying by it and then adding the
;; other members of the cons cell in one go
;; loses precision, since a double does not
;; have enough significant digits to hold a
;; full 64-bit value. So below we split
;; 1099511627776 into high 13 and low 5
;; digits and compute in two parts.
(let ((p1 (* (car inode) 10995116.0))
(p2 (+ (* (car inode) 27776.0)
(* (cadr inode) 65536.0)
(cddr inode))))
(format " %13.0f%05.0f "
;; Use floor to emulate integer
;; division.
(+ p1 (floor p2 100000.0))
(mod p2 100000.0)))
(format " %18.0f "
(+ (* (car inode) 65536.0)
(cdr inode))))
(format " %18d " inode))))
;; nil is treated like "" in concat
(if (memq ?s switches) ; size in K
(format ls-lisp-filesize-f-fmt
(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 string or an integer
(let ((uid (nth 2 file-attr)))
(format (if (stringp uid)
ls-lisp-uid-s-fmt
ls-lisp-uid-d-fmt)
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)
ls-lisp-gid-s-fmt
ls-lisp-gid-d-fmt)
gid))))
(ls-lisp-format-file-size file-size (memq ?h switches))
" "
(ls-lisp-format-time file-attr time-index)
" "
(if (not (memq ?F switches)) ; ls-lisp-classify already did that
(propertize file-name 'dired-filename t)
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)
"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 the current time.
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 (- (float-time time) (float-time)))
;; 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 (and locale (not ls-lisp-use-localized-time-format))
"%m-%d %H:%M"
(nth 0 ls-lisp-format-time-list))
(if (and locale (not ls-lisp-use-localized-time-format))
"%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 (not human-readable)
(format (if (floatp file-size)
ls-lisp-filesize-f-fmt
ls-lisp-filesize-d-fmt)
file-size)
(format " %7s" (file-size-human-readable file-size))))
(provide 'ls-lisp)
;;; ls-lisp.el ends here
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