lisp/eshell/esh-util.el

   1 ;;; esh-util.el --- general utilities
   2
   3 ;; Copyright (C) 1999, 2000, 2001 Free Software Foundation
   4
   5 ;; Author: John Wiegley <johnw@gnu.org>
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software; you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation; either version 2, or (at your option)
  12 ;; any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22 ;; Boston, MA 02111-1307, USA.
  23
  24 (provide 'esh-util)
  25
  26 (eval-when-compile (require 'esh-maint))
  27
  28 (defgroup eshell-util nil
  29   "This is general utility code, meant for use by Eshell itself."
  30   :tag "General utilities"
  31   :group 'eshell)
  32
  33 ;;; Commentary:
  34
  35 (require 'pp)
  36
  37 ;;; User Variables:
  38
  39 (defcustom eshell-stringify-t t
  40   "*If non-nil, the string representation of t is 't'.
  41 If nil, t will be represented only in the exit code of the function,
  42 and not printed as a string.  This causes Lisp functions to behave
  43 similarly to external commands, as far as successful result output."
  44   :type 'boolean
  45   :group 'eshell-util)
  46
  47 (defcustom eshell-group-file "/etc/group"
  48   "*If non-nil, the name of the group file on your system."
  49   :type '(choice (const :tag "No group file" nil) file)
  50   :group 'eshell-util)
  51
  52 (defcustom eshell-passwd-file "/etc/passwd"
  53   "*If non-nil, the name of the passwd file on your system."
  54   :type '(choice (const :tag "No passwd file" nil) file)
  55   :group 'eshell-util)
  56
  57 (defcustom eshell-hosts-file "/etc/hosts"
  58   "*The name of the /etc/hosts file."
  59   :type '(choice (const :tag "No hosts file" nil) file)
  60   :group 'eshell-util)
  61
  62 (defcustom eshell-handle-errors t
  63   "*If non-nil, Eshell will handle errors itself.
  64 Setting this to nil is offered as an aid to debugging only."
  65   :type 'boolean
  66   :group 'eshell-util)
  67
  68 (defcustom eshell-private-file-modes 384 ; umask 177
  69   "*The file-modes value to use for creating \"private\" files."
  70   :type 'integer
  71   :group 'eshell-util)
  72
  73 (defcustom eshell-private-directory-modes 448 ; umask 077
  74   "*The file-modes value to use for creating \"private\" directories."
  75   :type 'integer
  76   :group 'eshell-util)
  77
  78 (defcustom eshell-tar-regexp
  79   "\\.t\\(ar\\(\\.\\(gz\\|bz2\\|Z\\)\\)?\\|gz\\|a[zZ]\\|z2\\)\\'"
  80   "*Regular expression used to match tar file names."
  81   :type 'regexp
  82   :group 'eshell-util)
  83
  84 (defcustom eshell-convert-numeric-arguments t
  85   "*If non-nil, converting arguments of numeric form to Lisp numbers.
  86 Numeric form is tested using the regular expression
  87 `eshell-number-regexp'.
  88
  89 NOTE: If you find that numeric conversions are intefering with the
  90 specification of filenames (for example, in calling `find-file', or
  91 some other Lisp function that deals with files, not numbers), add the
  92 following in your .emacs file:
  93
  94   (put 'find-file 'eshell-no-numeric-conversions t)
  95
  96 Any function with the property `eshell-no-numeric-conversions' set to
  97 a non-nil value, will be passed strings, not numbers, even when an
  98 argument matches `eshell-number-regexp'."
  99   :type 'boolean
 100   :group 'eshell-util)
 101
 102 (defcustom eshell-number-regexp "-?\\([0-9]*\\.\\)?[0-9]+\\(e[-0-9.]+\\)?"
 103   "*Regular expression used to match numeric arguments.
 104 If `eshell-convert-numeric-arguments' is non-nil, and an argument
 105 matches this regexp, it will be converted to a Lisp number, using the
 106 function `string-to-number'."
 107   :type 'regexp
 108   :group 'eshell-util)
 109
 110 (defcustom eshell-ange-ls-uids nil
 111   "*List of user/host/id strings, used to determine remote ownership."
 112   :type '(repeat (cons :tag "Host for User/UID map"
 113                        (string :tag "Hostname")
 114                        (repeat (cons :tag "User/UID List"
 115                                      (string :tag "Username")
 116                                      (repeat :tag "UIDs" string)))))
 117   :group 'eshell-util)
 118
 119 ;;; Internal Variables:
 120
 121 (defvar eshell-group-names nil
 122   "A cache to hold the names of groups.")
 123
 124 (defvar eshell-group-timestamp nil
 125   "A timestamp of when the group file was read.")
 126
 127 (defvar eshell-user-names nil
 128   "A cache to hold the names of users.")
 129
 130 (defvar eshell-user-timestamp nil
 131   "A timestamp of when the user file was read.")
 132
 133 (defvar eshell-host-names nil
 134   "A cache the names of frequently accessed hosts.")
 135
 136 (defvar eshell-host-timestamp nil
 137   "A timestamp of when the hosts file was read.")
 138
 139 ;;; Functions:
 140
 141 (defsubst eshell-under-xemacs-p ()
 142   "Return non-nil if we are running under XEmacs."
 143   (boundp 'xemacs-logo))
 144
 145 (defsubst eshell-under-windows-p ()
 146   "Return non-nil if we are running under MS-DOS/Windows."
 147   (memq system-type '(ms-dos windows-nt)))
 148
 149 (defmacro eshell-condition-case (tag form &rest handlers)
 150   "Like `condition-case', but only if `eshell-pass-through-errors' is nil."
 151   (if eshell-handle-errors
 152       `(condition-case ,tag
 153            ,form
 154          ,@handlers)
 155     form))
 156
 157 (put 'eshell-condition-case 'lisp-indent-function 2)
 158
 159 (defmacro eshell-deftest (module name label &rest forms)
 160   (if (and (fboundp 'cl-compiling-file) (cl-compiling-file))
 161       nil
 162     (let ((fsym (intern (concat "eshell-test--" (symbol-name name)))))
 163       `(eval-when-compile
 164          (ignore
 165           (defun ,fsym () ,label
 166             (eshell-run-test (quote ,module) (quote ,fsym) ,label
 167                              (quote (progn ,@forms)))))))))
 168
 169 (put 'eshell-deftest 'lisp-indent-function 2)
 170
 171 (defun eshell-find-delimiter
 172   (open close &optional bound reverse-p backslash-p)
 173   "From point, find the CLOSE delimiter corresponding to OPEN.
 174 The matching is bounded by BOUND.
 175 If REVERSE-P is non-nil, process the region backwards.
 176 If BACKSLASH-P is non-nil, and OPEN and CLOSE are the same character,
 177 then quoting is done by a backslash, rather than a doubled delimiter."
 178   (save-excursion
 179     (let ((depth 1)
 180           (bound (or bound (point-max))))
 181       (if (if reverse-p
 182               (eq (char-before) close)
 183             (eq (char-after) open))
 184           (forward-char (if reverse-p -1 1)))
 185       (while (and (> depth 0)
 186                   (funcall (if reverse-p '> '<) (point) bound))
 187         (let ((c (if reverse-p (char-before) (char-after))) nc)
 188           (cond ((and (not reverse-p)
 189                       (or (not (eq open close))
 190                           backslash-p)
 191                       (eq c ?\\)
 192                       (setq nc (char-after (1+ (point))))
 193                       (or (eq nc open) (eq nc close)))
 194                  (forward-char 1))
 195                 ((and reverse-p
 196                       (or (not (eq open close))
 197                           backslash-p)
 198                       (or (eq c open) (eq c close))
 199                       (eq (char-before (1- (point)))
 200                           ?\\))
 201                  (forward-char -1))
 202                 ((eq open close)
 203                  (if (eq c open)
 204                      (if (and (not backslash-p)
 205                               (eq (if reverse-p
 206                                       (char-before (1- (point)))
 207                                     (char-after (1+ (point)))) open))
 208                          (forward-char (if reverse-p -1 1))
 209                        (setq depth (1- depth)))))
 210                 ((= c open)
 211                  (setq depth (+ depth (if reverse-p -1 1))))
 212                 ((= c close)
 213                  (setq depth (+ depth (if reverse-p 1 -1))))))
 214         (forward-char (if reverse-p -1 1)))
 215       (if (= depth 0)
 216           (if reverse-p (point) (1- (point)))))))
 217
 218 (defun eshell-convert (string)
 219   "Convert STRING into a more native looking Lisp object."
 220   (if (not (stringp string))
 221       string
 222     (let ((len (length string)))
 223       (if (= len 0)
 224           string
 225         (if (eq (aref string (1- len)) ?\n)
 226             (setq string (substring string 0 (1- len))))
 227         (if (string-match "\n" string)
 228             (split-string string "\n")
 229           (if (and eshell-convert-numeric-arguments
 230                    (string-match
 231                     (concat "\\`\\s-*" eshell-number-regexp
 232                             "\\s-*\\'") string))
 233               (string-to-number string)
 234             string))))))
 235
 236 (defun eshell-sublist (l &optional n m)
 237   "Return from LIST the N to M elements.
 238 If N or M is nil, it means the end of the list."
 239   (let* ((a (eshell-copy-list l))
 240          result)
 241     (if (and m (consp (nthcdr m a)))
 242         (setcdr (nthcdr m a) nil))
 243     (if n
 244         (setq a (nthcdr n a))
 245       (setq n (1- (length a))
 246             a (last a)))
 247     a))
 248
 249 (defun eshell-split-path (path)
 250   "Split a path into multiple subparts."
 251   (let ((len (length path))
 252         (i 0) (li 0)
 253         parts)
 254     (if (and (eshell-under-windows-p)
 255              (> len 2)
 256              (eq (aref path 0) directory-sep-char)
 257              (eq (aref path 1) directory-sep-char))
 258         (setq i 2))
 259     (while (< i len)
 260       (if (and (eq (aref path i) directory-sep-char)
 261                (not (get-text-property i 'escaped path)))
 262           (setq parts (cons (if (= li i)
 263                                 (char-to-string directory-sep-char)
 264                               (substring path li (1+ i))) parts)
 265                 li (1+ i)))
 266       (setq i (1+ i)))
 267     (if (< li i)
 268         (setq parts (cons (substring path li i) parts)))
 269     (if (and (eshell-under-windows-p)
 270              (string-match "\\`[A-Za-z]:\\'" (car (last parts))))
 271         (setcar (last parts)
 272                 (concat (car (last parts))
 273                         (char-to-string directory-sep-char))))
 274     (nreverse parts)))
 275
 276 (defun eshell-to-flat-string (value)
 277   "Make value a string.  If separated by newlines change them to spaces."
 278   (let ((text (eshell-stringify value)))
 279     (if (string-match "\n+\\'" text)
 280         (setq text (replace-match "" t t text)))
 281     (while (string-match "\n+" text)
 282       (setq text (replace-match " " t t text)))
 283     text))
 284
 285 (defmacro eshell-for (for-var for-list &rest forms)
 286   "Iterate through a list"
 287   `(let ((list-iter ,for-list))
 288      (while list-iter
 289        (let ((,for-var (car list-iter)))
 290          ,@forms)
 291        (setq list-iter (cdr list-iter)))))
 292
 293 (put 'eshell-for 'lisp-indent-function 2)
 294
 295 (defun eshell-flatten-list (args)
 296   "Flatten any lists within ARGS, so that there are no sublists."
 297   (let ((new-list (list t)))
 298     (eshell-for a args
 299       (if (and (listp a)
 300                (listp (cdr a)))
 301           (nconc new-list (eshell-flatten-list a))
 302         (nconc new-list (list a))))
 303     (cdr new-list)))
 304
 305 (defun eshell-uniqify-list (l)
 306   "Remove occurring multiples in L.  You probably want to sort first."
 307   (let ((m l))
 308     (while m
 309       (while (and (cdr m)
 310                   (string= (car m)
 311                            (cadr m)))
 312         (setcdr m (cddr m)))
 313       (setq m (cdr m))))
 314   l)
 315
 316 (defun eshell-stringify (object)
 317   "Convert OBJECT into a string value."
 318   (cond
 319    ((stringp object) object)
 320    ((and (listp object)
 321          (not (eq object nil)))
 322     (let ((string (pp-to-string object)))
 323       (substring string 0 (1- (length string)))))
 324    ((numberp object)
 325     (number-to-string object))
 326    (t
 327     (unless (and (eq object t)
 328                  (not eshell-stringify-t))
 329       (pp-to-string object)))))
 330
 331 (defsubst eshell-stringify-list (args)
 332   "Convert each element of ARGS into a string value."
 333   (mapcar 'eshell-stringify args))
 334
 335 (defsubst eshell-flatten-and-stringify (&rest args)
 336   "Flatten and stringify all of the ARGS into a single string."
 337   (mapconcat 'eshell-stringify (eshell-flatten-list args) " "))
 338
 339 ;; the next two are from GNUS, and really should be made part of Emacs
 340 ;; some day
 341 (defsubst eshell-time-less-p (t1 t2)
 342   "Say whether time T1 is less than time T2."
 343   (or (< (car t1) (car t2))
 344       (and (= (car t1) (car t2))
 345            (< (nth 1 t1) (nth 1 t2)))))
 346
 347 (defsubst eshell-time-to-seconds (time)
 348   "Convert TIME to a floating point number."
 349   (+ (* (car time) 65536.0)
 350      (cadr time)
 351      (/ (or (car (cdr (cdr time))) 0) 1000000.0)))
 352
 353 (defsubst eshell-directory-files (regexp &optional directory)
 354   "Return a list of files in the given DIRECTORY matching REGEXP."
 355   (directory-files (or directory default-directory)
 356                    directory regexp))
 357
 358 (defun eshell-regexp-arg (prompt)
 359   "Return list of regexp and prefix arg using PROMPT."
 360   (let* (;; Don't clobber this.
 361          (last-command last-command)
 362          (regexp (read-from-minibuffer prompt nil nil nil
 363                                        'minibuffer-history-search-history)))
 364     (list (if (string-equal regexp "")
 365               (setcar minibuffer-history-search-history
 366                       (nth 1 minibuffer-history-search-history))
 367             regexp)
 368           (prefix-numeric-value current-prefix-arg))))
 369
 370 (defun eshell-printable-size (filesize &optional human-readable
 371                                        block-size use-colors)
 372   "Return a printable FILESIZE."
 373   (let ((size (float (or filesize 0))))
 374     (if human-readable
 375         (if (< size human-readable)
 376             (if (= (round size) 0)
 377                 "0"
 378               (if block-size
 379                   "1.0k"
 380                 (format "%.0f" size)))
 381           (setq size (/ size human-readable))
 382           (if (< size human-readable)
 383               (if (<= size 9.94)
 384                   (format "%.1fk" size)
 385                 (format "%.0fk" size))
 386             (setq size (/ size human-readable))
 387             (if (< size human-readable)
 388                 (let ((str (if (<= size 9.94)
 389                                (format "%.1fM" size)
 390                              (format "%.0fM" size))))
 391                   (if use-colors
 392                       (put-text-property 0 (length str)
 393                                          'face 'bold str))
 394                   str)
 395               (setq size (/ size human-readable))
 396               (if (< size human-readable)
 397                   (let ((str (if (<= size 9.94)
 398                                  (format "%.1fG" size)
 399                                (format "%.0fG" size))))
 400                     (if use-colors
 401                         (put-text-property 0 (length str)
 402                                            'face 'bold-italic str))
 403                     str)))))
 404       (if block-size
 405           (setq size (/ size block-size)))
 406       (format "%.0f" size))))
 407
 408 (defun eshell-winnow-list (entries exclude &optional predicates)
 409   "Pare down the ENTRIES list using the EXCLUDE regexp, and PREDICATES.
 410 The original list is not affected.  If the result is only one element
 411 long, it will be returned itself, rather than returning a one-element
 412 list."
 413   (let ((flist (list t))
 414         valid p listified)
 415     (unless (listp entries)
 416       (setq entries (list entries)
 417             listified t))
 418     (eshell-for entry entries
 419       (unless (and exclude (string-match exclude entry))
 420         (setq p predicates valid (null p))
 421         (while p
 422           (if (funcall (car p) entry)
 423               (setq valid t)
 424             (setq p nil valid nil))
 425           (setq p (cdr p)))
 426         (when valid
 427           (nconc flist (list entry)))))
 428     (if listified
 429         (cadr flist)
 430       (cdr flist))))
 431
 432 (defsubst eshell-redisplay ()
 433   "Allow Emacs to redisplay buffers."
 434   ;; for some strange reason, Emacs 21 is prone to trigger an
 435   ;; "args out of range" error in `sit-for', if this function
 436   ;; runs while point is in the minibuffer and the users attempt
 437   ;; to use completion.  Don't ask me.
 438   (ignore-errors (sit-for 0 0)))
 439
 440 (defun eshell-read-passwd-file (file)
 441   "Return an alist correlating gids to group names in FILE."
 442   (let (names)
 443     (when (file-readable-p file)
 444       (with-temp-buffer
 445         (insert-file-contents file)
 446         (goto-char (point-min))
 447         (while (not (eobp))
 448           (let* ((fields
 449                   (split-string (buffer-substring
 450                                  (point) (progn (end-of-line)
 451                                                 (point))) ":")))
 452             (if (and (and fields (nth 0 fields) (nth 2 fields))
 453                      (not (assq (string-to-int (nth 2 fields)) names)))
 454                 (setq names (cons (cons (string-to-int (nth 2 fields))
 455                                         (nth 0 fields))
 456                                   names))))
 457           (forward-line))))
 458     names))
 459
 460 (defun eshell-read-passwd (file result-var timestamp-var)
 461   "Read the contents of /etc/passwd for user names."
 462   (if (or (not (symbol-value result-var))
 463           (not (symbol-value timestamp-var))
 464           (eshell-time-less-p
 465            (symbol-value timestamp-var)
 466            (nth 5 (file-attributes file))))
 467       (progn
 468         (set result-var (eshell-read-passwd-file file))
 469         (set timestamp-var (current-time))))
 470   (symbol-value result-var))
 471
 472 (defun eshell-read-group-names ()
 473   "Read the contents of /etc/group for group names."
 474   (if eshell-group-file
 475       (eshell-read-passwd eshell-group-file 'eshell-group-names
 476                           'eshell-group-timestamp)))
 477
 478 (defsubst eshell-group-id (name)
 479   "Return the user id for user NAME."
 480   (car (rassoc name (eshell-read-group-names))))
 481
 482 (defsubst eshell-group-name (gid)
 483   "Return the group name for the given GID."
 484   (cdr (assoc gid (eshell-read-group-names))))
 485
 486 (defun eshell-read-user-names ()
 487   "Read the contents of /etc/passwd for user names."
 488   (if eshell-passwd-file
 489       (eshell-read-passwd eshell-passwd-file 'eshell-user-names
 490                           'eshell-user-timestamp)))
 491
 492 (defsubst eshell-user-id (name)
 493   "Return the user id for user NAME."
 494   (car (rassoc name (eshell-read-user-names))))
 495
 496 (defalias 'eshell-user-name 'user-login-name)
 497
 498 (defun eshell-read-hosts-file (filename)
 499   "Read in the hosts from the /etc/hosts file."
 500   (let (hosts)
 501     (with-temp-buffer
 502       (insert-file-contents eshell-hosts-file)
 503       (goto-char (point-min))
 504       (while (re-search-forward
 505               "^\\(\\S-+\\)\\s-+\\(\\S-+\\)\\(\\s-*\\(\\S-+\\)\\)?" nil t)
 506         (if (match-string 1)
 507             (add-to-list 'hosts (match-string 1)))
 508         (if (match-string 2)
 509             (add-to-list 'hosts (match-string 2)))
 510         (if (match-string 4)
 511             (add-to-list 'hosts (match-string 4)))))
 512     (sort hosts 'string-lessp)))
 513
 514 (defun eshell-read-hosts (file result-var timestamp-var)
 515   "Read the contents of /etc/passwd for user names."
 516   (if (or (not (symbol-value result-var))
 517           (not (symbol-value timestamp-var))
 518           (eshell-time-less-p
 519            (symbol-value timestamp-var)
 520            (nth 5 (file-attributes file))))
 521       (progn
 522         (set result-var (eshell-read-hosts-file file))
 523         (set timestamp-var (current-time))))
 524   (symbol-value result-var))
 525
 526 (defun eshell-read-host-names ()
 527   "Read the contents of /etc/hosts for host names."
 528   (if eshell-hosts-file
 529       (eshell-read-hosts eshell-hosts-file 'eshell-host-names
 530                          'eshell-host-timestamp)))
 531
 532 (unless (fboundp 'line-end-position)
 533   (defsubst line-end-position (&optional N)
 534     (save-excursion (end-of-line N) (point))))
 535
 536 (unless (fboundp 'line-beginning-position)
 537   (defsubst line-beginning-position (&optional N)
 538     (save-excursion (beginning-of-line N) (point))))
 539
 540 (unless (fboundp 'subst-char-in-string)
 541   (defun subst-char-in-string (fromchar tochar string &optional inplace)
 542     "Replace FROMCHAR with TOCHAR in STRING each time it occurs.
 543 Unless optional argument INPLACE is non-nil, return a new string."
 544     (let ((i (length string))
 545           (newstr (if inplace string (copy-sequence string))))
 546       (while (> i 0)
 547         (setq i (1- i))
 548         (if (eq (aref newstr i) fromchar)
 549             (aset newstr i tochar)))
 550       newstr)))
 551
 552 (defsubst eshell-copy-environment ()
 553   "Return an unrelated copy of `process-environment'."
 554   (mapcar 'concat process-environment))
 555
 556 (defun eshell-subgroups (groupsym)
 557   "Return all of the subgroups of GROUPSYM."
 558   (let ((subgroups (get groupsym 'custom-group))
 559         (subg (list t)))
 560     (while subgroups
 561       (if (eq (cadr (car subgroups)) 'custom-group)
 562           (nconc subg (list (caar subgroups))))
 563       (setq subgroups (cdr subgroups)))
 564     (cdr subg)))
 565
 566 (defmacro eshell-with-file-modes (modes &rest forms)
 567   "Evaluate, with file-modes set to MODES, the given FORMS."
 568   `(let ((modes (default-file-modes)))
 569      (set-default-file-modes ,modes)
 570      (unwind-protect
 571          (progn ,@forms)
 572        (set-default-file-modes modes))))
 573
 574 (defmacro eshell-with-private-file-modes (&rest forms)
 575   "Evaluate FORMS with private file modes set."
 576   `(eshell-with-file-modes ,eshell-private-file-modes ,@forms))
 577
 578 (defsubst eshell-make-private-directory (dir &optional parents)
 579   "Make DIR with file-modes set to `eshell-private-directory-modes'."
 580   (eshell-with-file-modes eshell-private-directory-modes
 581                           (make-directory dir parents)))
 582
 583 (defsubst eshell-substring (string sublen)
 584   "Return the beginning of STRING, up to SUBLEN bytes."
 585   (if string
 586       (if (> (length string) sublen)
 587           (substring string 0 sublen)
 588         string)))
 589
 590 (unless (fboundp 'directory-files-and-attributes)
 591   (defun directory-files-and-attributes (dir &optional full match nosort)
 592     (documentation 'directory-files)
 593     (let ((dir (expand-file-name dir)) ange-cache)
 594       (mapcar
 595        (function
 596         (lambda (file)
 597           (cons file (eshell-file-attributes (expand-file-name file dir)))))
 598        (directory-files dir full match nosort)))))
 599
 600 (eval-when-compile
 601   (defvar ange-cache))
 602
 603 (defun eshell-directory-files-and-attributes (dir &optional full match nosort)
 604   "Make sure to use the handler for `directory-file-and-attributes'."
 605   (let* ((dir (expand-file-name dir))
 606          (dfh (find-file-name-handler dir 'directory-files)))
 607     (if (not dfh)
 608         (directory-files-and-attributes dir full match nosort)
 609       (let ((files (funcall dfh 'directory-files dir full match nosort))
 610             (fah (find-file-name-handler dir 'file-attributes)))
 611         (mapcar
 612          (function
 613           (lambda (file)
 614             (cons file (if fah
 615                            (eshell-file-attributes
 616                             (expand-file-name file dir))
 617                          (file-attributes (expand-file-name file dir))))))
 618          files)))))
 619
 620 (defun eshell-current-ange-uids ()
 621   (if (string-match "/\\([^@]+\\)@\\([^:]+\\):" default-directory)
 622       (let* ((host (match-string 2 default-directory))
 623              (user (match-string 1 default-directory))
 624              (host-users (assoc host eshell-ange-ls-uids)))
 625         (when host-users
 626           (setq host-users (cdr host-users))
 627           (cdr (assoc user host-users))))))
 628
 629 ;; Add an autoload for parse-time-string
 630 (if (and (not (fboundp 'parse-time-string))
 631          (locate-library "parse-time"))
 632     (autoload 'parse-time-string "parse-time"))
 633
 634 (eval-when-compile
 635   (load "ange-ftp" t))
 636
 637 (defun eshell-parse-ange-ls (dir)
 638   (let (entry)
 639     (with-temp-buffer
 640       (insert (ange-ftp-ls dir "-la" nil))
 641       (goto-char (point-min))
 642       (if (looking-at "^total [0-9]+$")
 643           (forward-line 1))
 644       ;; Some systems put in a blank line here.
 645       (if (eolp) (forward-line 1))
 646       (while (looking-at
 647               `,(concat "\\([dlscb-][rwxst-]+\\)"
 648                         "\\s-*" "\\([0-9]+\\)" "\\s-+"
 649                         "\\(\\S-+\\)" "\\s-+"
 650                         "\\(\\S-+\\)" "\\s-+"
 651                         "\\([0-9]+\\)" "\\s-+" "\\(.*\\)"))
 652         (let* ((perms (match-string 1))
 653                (links (string-to-number (match-string 2)))
 654                (user (match-string 3))
 655                (group (match-string 4))
 656                (size (string-to-number (match-string 5)))
 657                (mtime
 658                 (if (fboundp 'parse-time-string)
 659                     (let ((moment (parse-time-string
 660                                    (match-string 6))))
 661                       (if (nth 0 moment)
 662                           (setcar (nthcdr 5 moment)
 663                                   (nth 5 (decode-time (current-time))))
 664                         (setcar (nthcdr 0 moment) 0)
 665                         (setcar (nthcdr 1 moment) 0)
 666                         (setcar (nthcdr 2 moment) 0))
 667                       (apply 'encode-time moment))
 668                   (ange-ftp-file-modtime (expand-file-name name dir))))
 669                (name (ange-ftp-parse-filename))
 670                symlink)
 671           (if (string-match "\\(.+\\) -> \\(.+\\)" name)
 672               (setq symlink (match-string 2 name)
 673                     name (match-string 1 name)))
 674           (setq entry
 675                 (cons
 676                  (cons name
 677                        (list (if (eq (aref perms 0) ?d)
 678                                  t
 679                                symlink)
 680                              links user group
 681                              nil mtime nil
 682                              size perms nil nil)) entry)))
 683         (forward-line)))
 684     entry))
 685
 686 (defun eshell-file-attributes (file)
 687   "Return the attributes of FILE, playing tricks if it's over ange-ftp."
 688   (let* ((file (expand-file-name file))
 689          (handler (find-file-name-handler file 'file-attributes))
 690          entry)
 691     (if (not handler)
 692         (file-attributes file)
 693       (if (eq (find-file-name-handler (file-name-directory file)
 694                                       'directory-files)
 695               'ange-ftp-hook-function)
 696           (let ((base (file-name-nondirectory file))
 697                 (dir (file-name-directory file)))
 698             (if (boundp 'ange-cache)
 699                 (setq entry (cdr (assoc base (cdr (assoc dir ange-cache))))))
 700             (unless entry
 701               (setq entry (eshell-parse-ange-ls dir))
 702               (if (boundp 'ange-cache)
 703                   (setq ange-cache
 704                         (cons (cons dir entry)
 705                               ange-cache)))
 706               (if entry
 707                   (let ((fentry (assoc base (cdr entry))))
 708                     (if fentry
 709                         (setq entry (cdr fentry))
 710                       (setq entry nil)))))))
 711       (or entry (funcall handler 'file-attributes file)))))
 712
 713 (defun eshell-copy-list (list)
 714   "Return a copy of a list, which may be a dotted list.
 715 The elements of the list are not copied, just the list structure itself."
 716   (if (consp list)
 717       (let ((res nil))
 718         (while (consp list) (push (pop list) res))
 719         (prog1 (nreverse res) (setcdr res list)))
 720     (car list)))
 721
 722 (defun eshell-copy-tree (tree &optional vecp)
 723   "Make a copy of TREE.
 724 If TREE is a cons cell, this recursively copies both its car and its cdr.
 725 Contrast to copy-sequence, which copies only along the cdrs.  With second
 726 argument VECP, this copies vectors as well as conses."
 727   (if (consp tree)
 728       (let ((p (setq tree (eshell-copy-list tree))))
 729         (while (consp p)
 730           (if (or (consp (car p)) (and vecp (vectorp (car p))))
 731               (setcar p (eshell-copy-tree (car p) vecp)))
 732           (or (listp (cdr p)) (setcdr p (eshell-copy-tree (cdr p) vecp)))
 733           (cl-pop p)))
 734     (if (and vecp (vectorp tree))
 735         (let ((i (length (setq tree (copy-sequence tree)))))
 736           (while (>= (setq i (1- i)) 0)
 737             (aset tree i (eshell-copy-tree (aref tree i) vecp))))))
 738   tree)
 739
 740 (defsubst eshell-processp (proc)
 741   "If the `processp' function does not exist, PROC is not a process."
 742   (and (fboundp 'processp) (processp proc)))
 743
 744 ; (defun eshell-copy-file
 745 ;   (file newname &optional ok-if-already-exists keep-date)
 746 ;   "Copy FILE to NEWNAME.  See docs for `copy-file'."
 747 ;   (let (copied)
 748 ;     (if (string-match "\\`\\([^:]+\\):\\(.*\\)" file)
 749 ;       (let ((front (match-string 1 file))
 750 ;             (back (match-string 2 file))
 751 ;             buffer)
 752 ;         (if (and front (string-match eshell-tar-regexp front)
 753 ;                    (setq buffer (find-file-noselect front)))
 754 ;           (with-current-buffer buffer
 755 ;             (goto-char (point-min))
 756 ;             (if (re-search-forward (concat " " (regexp-quote back)
 757 ;                                            "$") nil t)
 758 ;                 (progn
 759 ;                   (tar-copy (if (file-directory-p newname)
 760 ;                                 (expand-file-name
 761 ;                                  (file-name-nondirectory back) newname)
 762 ;                               newname))
 763 ;                   (setq copied t))
 764 ;               (error "%s not found in tar file %s" back front))))))
 765 ;     (unless copied
 766 ;       (copy-file file newname ok-if-already-exists keep-date))))
 767
 768 ; (defun eshell-file-attributes (filename)
 769 ;   "Return a list of attributes of file FILENAME.
 770 ; See the documentation for `file-attributes'."
 771 ;   (let (result)
 772 ;     (when (string-match "\\`\\([^:]+\\):\\(.*\\)\\'" filename)
 773 ;       (let ((front (match-string 1 filename))
 774 ;           (back (match-string 2 filename))
 775 ;           buffer)
 776 ;       (when (and front (string-match eshell-tar-regexp front)
 777 ;                  (setq buffer (find-file-noselect front)))
 778 ;         (with-current-buffer buffer
 779 ;           (goto-char (point-min))
 780 ;           (when (re-search-forward (concat " " (regexp-quote back)
 781 ;                                            "\\s-*$") nil t)
 782 ;             (let* ((descrip (tar-current-descriptor))
 783 ;                    (tokens (tar-desc-tokens descrip)))
 784 ;               (setq result
 785 ;                     (list
 786 ;                      (cond
 787 ;                       ((eq (tar-header-link-type tokens) 5)
 788 ;                        t)
 789 ;                       ((eq (tar-header-link-type tokens) t)
 790 ;                        (tar-header-link-name tokens)))
 791 ;                      1
 792 ;                      (tar-header-uid tokens)
 793 ;                      (tar-header-gid tokens)
 794 ;                      (tar-header-date tokens)
 795 ;                      (tar-header-date tokens)
 796 ;                      (tar-header-date tokens)
 797 ;                      (tar-header-size tokens)
 798 ;                      (concat
 799 ;                       (cond
 800 ;                        ((eq (tar-header-link-type tokens) 5) "d")
 801 ;                        ((eq (tar-header-link-type tokens) t) "l")
 802 ;                        (t "-"))
 803 ;                       (tar-grind-file-mode (tar-header-mode tokens)
 804 ;                                            (make-string 9 ? ) 0))
 805 ;                      nil nil nil))))))))
 806 ;     (or result
 807 ;       (file-attributes filename))))
 808
 809 ;;; Code:
 810
 811 ;;; esh-util.el ends here