em-unix.el 35 KB
Newer Older
1
;;; em-unix.el --- UNIX command aliases
Gerd Moellmann's avatar
Gerd Moellmann committed
2

3 4
;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
;;   2008  Free Software Foundation, Inc.
Gerd Moellmann's avatar
Gerd Moellmann committed
5

Gerd Moellmann's avatar
Gerd Moellmann committed
6 7
;; Author: John Wiegley <johnw@gnu.org>

Gerd Moellmann's avatar
Gerd Moellmann committed
8 9
;; This file is part of GNU Emacs.

10
;; GNU Emacs is free software: you can redistribute it and/or modify
Gerd Moellmann's avatar
Gerd Moellmann committed
11
;; it under the terms of the GNU General Public License as published by
12 13
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
Gerd Moellmann's avatar
Gerd Moellmann committed
14 15 16 17 18 19 20

;; 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
21
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
Gerd Moellmann's avatar
Gerd Moellmann committed
22

23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
;;; Commentary:

;; This file contains implementations of several UNIX command in Emacs
;; Lisp, for several reasons:
;;
;;   1) it makes them available on all platforms where the Lisp
;;      functions used are available
;;
;;   2) it makes their functionality accessible and modified by the
;;      Lisp programmer.
;;
;;   3) it allows Eshell to refrain from having to invoke external
;;      processes for common operations.

;;; Code:
Gerd Moellmann's avatar
Gerd Moellmann committed
38

39
(require 'eshell)
Gerd Moellmann's avatar
Gerd Moellmann committed
40

41 42
;;;###autoload
(eshell-defgroup eshell-unix nil
Gerd Moellmann's avatar
Gerd Moellmann committed
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78
  "This module defines many of the more common UNIX utilities as
aliases implemented in Lisp.  These include mv, ln, cp, rm, etc.  If
the user passes arguments which are too complex, or are unrecognized
by the Lisp variant, the external version will be called (if
available).  The only reason not to use them would be because they are
usually much slower.  But in several cases their tight integration
with Eshell makes them more versatile than their traditional cousins
\(such as being able to use `kill' to kill Eshell background processes
by name)."
  :tag "UNIX commands in Lisp"
  :group 'eshell-module)

(defcustom eshell-unix-load-hook '(eshell-unix-initialize)
  "*A list of functions to run when `eshell-unix' is loaded."
  :type 'hook
  :group 'eshell-unix)

(defcustom eshell-plain-grep-behavior nil
  "*If non-nil, standalone \"grep\" commands will behave normally.
Standalone in this context means not redirected, and not on the
receiving side of a command pipeline."
  :type 'boolean
  :group 'eshell-unix)

(defcustom eshell-no-grep-available (not (eshell-search-path "grep"))
  "*If non-nil, no grep is available on the current machine."
  :type 'boolean
  :group 'eshell-unix)

(defcustom eshell-plain-diff-behavior nil
  "*If non-nil, standalone \"diff\" commands will behave normally.
Standalone in this context means not redirected, and not on the
receiving side of a command pipeline."
  :type 'boolean
  :group 'eshell-unix)

79
(defcustom eshell-plain-locate-behavior (featurep 'xemacs)
Gerd Moellmann's avatar
Gerd Moellmann committed
80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121
  "*If non-nil, standalone \"locate\" commands will behave normally.
Standalone in this context means not redirected, and not on the
receiving side of a command pipeline."
  :type 'boolean
  :group 'eshell-unix)

(defcustom eshell-rm-removes-directories nil
  "*If non-nil, `rm' will remove directory entries.
Otherwise, `rmdir' is required."
  :type 'boolean
  :group 'eshell-unix)

(defcustom eshell-rm-interactive-query (= (user-uid) 0)
  "*If non-nil, `rm' will query before removing anything."
  :type 'boolean
  :group 'eshell-unix)

(defcustom eshell-mv-interactive-query (= (user-uid) 0)
  "*If non-nil, `mv' will query before overwriting anything."
  :type 'boolean
  :group 'eshell-unix)

(defcustom eshell-mv-overwrite-files t
  "*If non-nil, `mv' will overwrite files without warning."
  :type 'boolean
  :group 'eshell-unix)

(defcustom eshell-cp-interactive-query (= (user-uid) 0)
  "*If non-nil, `cp' will query before overwriting anything."
  :type 'boolean
  :group 'eshell-unix)

(defcustom eshell-cp-overwrite-files t
  "*If non-nil, `cp' will overwrite files without warning."
  :type 'boolean
  :group 'eshell-unix)

(defcustom eshell-ln-interactive-query (= (user-uid) 0)
  "*If non-nil, `ln' will query before overwriting anything."
  :type 'boolean
  :group 'eshell-unix)

John Wiegley's avatar
John Wiegley committed
122
(defcustom eshell-ln-overwrite-files nil
Gerd Moellmann's avatar
Gerd Moellmann committed
123 124 125 126
  "*If non-nil, `ln' will overwrite files without warning."
  :type 'boolean
  :group 'eshell-unix)

John Wiegley's avatar
John Wiegley committed
127 128 129 130 131
(defcustom eshell-default-target-is-dot nil
  "*If non-nil, the default destination for cp, mv or ln is `.'."
  :type 'boolean
  :group 'eshell-unix)

132 133
(defcustom eshell-du-prefer-over-ange nil
  "*Use Eshell's du in ange-ftp remote directories.
134
Otherwise, Emacs will attempt to use rsh to invoke du on the remote machine."
135 136 137
  :type 'boolean
  :group 'eshell-unix)

Gerd Moellmann's avatar
Gerd Moellmann committed
138 139 140 141 142 143
;;; Functions:

(defun eshell-unix-initialize ()
  "Initialize the UNIX support/emulation code."
  (when (eshell-using-module 'eshell-cmpl)
    (add-hook 'pcomplete-try-first-hook
John Wiegley's avatar
John Wiegley committed
144 145 146 147 148 149
	      'eshell-complete-host-reference nil t))
  (make-local-variable 'eshell-complex-commands)
  (setq eshell-complex-commands
	(append '("grep" "egrep" "fgrep" "agrep" "glimpse" "locate"
		  "cat" "time" "cp" "mv" "make" "du" "diff")
		eshell-complex-commands)))
Gerd Moellmann's avatar
Gerd Moellmann committed
150 151 152 153 154

(defalias 'eshell/date     'current-time-string)
(defalias 'eshell/basename 'file-name-nondirectory)
(defalias 'eshell/dirname  'file-name-directory)

155 156 157 158
(defvar interactive)
(defvar preview)
(defvar recursive)
(defvar verbose)
Gerd Moellmann's avatar
Gerd Moellmann committed
159 160 161 162 163

(defun eshell/man (&rest args)
  "Invoke man, flattening the arguments appropriately."
  (funcall 'man (apply 'eshell-flatten-and-stringify args)))

164 165
(put 'eshell/man 'eshell-no-numeric-conversions t)

166
(defun eshell/info (&rest args)
167
  "Run the info command in-frame with the same behavior as command-line `info', ie:
168 169 170 171 172
  'info'           => goes to top info window
  'info arg1'      => IF arg1 is a file, then visits arg1
  'info arg1'      => OTHERWISE goes to top info window and then menu item arg1
  'info arg1 arg2' => does action for arg1 (either visit-file or menu-item) and then menu item arg2
  etc."
173
  (eval-and-compile (require 'info))
174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194
  (let ((file (cond
                ((not (stringp (car args)))
                 nil)
                ((file-exists-p (expand-file-name (car args)))
                 (expand-file-name (car args)))
                ((file-exists-p (concat (expand-file-name (car args)) ".info"))
                 (concat (expand-file-name (car args)) ".info")))))

    ;; If the first arg is a file, then go to that file's Top node
    ;; Otherwise, go to the global directory
    (if file
      (progn
        (setq args (cdr args))
        (Info-find-node file "Top"))
      (Info-directory))

    ;; Treat all remaining args as menu references
    (while args
      (Info-menu (car args))
      (setq args (cdr args)))))

Gerd Moellmann's avatar
Gerd Moellmann committed
195
(defun eshell-remove-entries (path files &optional top-level)
John Wiegley's avatar
John Wiegley committed
196
  "From PATH, remove all of the given FILES, perhaps interactively."
Gerd Moellmann's avatar
Gerd Moellmann committed
197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271
  (while files
    (if (string-match "\\`\\.\\.?\\'"
		      (file-name-nondirectory (car files)))
	(if top-level
	    (eshell-error "rm: cannot remove `.' or `..'\n"))
      (if (and (file-directory-p (car files))
	       (not (file-symlink-p (car files))))
	  (let ((dir (file-name-as-directory (car files))))
	    (eshell-remove-entries dir
				   (mapcar
				    (function
				     (lambda (file)
				       (concat dir file)))
				    (directory-files dir)))
	    (if verbose
		(eshell-printn (format "rm: removing directory `%s'"
				       (car files))))
	    (unless
		(or preview
		    (and interactive
			 (not (y-or-n-p
			       (format "rm: remove directory `%s'? "
				       (car files))))))
	      (eshell-funcalln 'delete-directory (car files))))
	(if verbose
	    (eshell-printn (format "rm: removing file `%s'"
				   (car files))))
	(unless (or preview
		    (and interactive
			 (not (y-or-n-p
			       (format "rm: remove `%s'? "
				       (car files))))))
	  (eshell-funcalln 'delete-file (car files)))))
    (setq files (cdr files))))

(defun eshell/rm (&rest args)
  "Implementation of rm in Lisp.
This is implemented to call either `delete-file', `kill-buffer',
`kill-process', or `unintern', depending on the nature of the
argument."
  (setq args (eshell-flatten-list args))
  (eshell-eval-using-options
   "rm" args
   '((?h "help" nil nil "show this usage screen")
     (?f "force" nil force-removal "force removal")
     (?i "interactive" nil interactive "prompt before any removal")
     (?n "preview" nil preview "don't change anything on disk")
     (?r "recursive" nil recursive
	 "remove the contents of directories recursively")
     (?R nil nil recursive "(same)")
     (?v "verbose" nil verbose "explain what is being done")
     :preserve-args
     :external "rm"
     :show-usage
     :usage "[OPTION]... FILE...
Remove (unlink) the FILE(s).")
   (unless interactive
     (setq interactive eshell-rm-interactive-query))
   (if (and force-removal interactive)
       (setq interactive nil))
   (while args
     (let ((entry (if (stringp (car args))
		      (directory-file-name (car args))
		    (if (numberp (car args))
			(number-to-string (car args))
		      (car args)))))
       (cond
	((bufferp entry)
	 (if verbose
	     (eshell-printn (format "rm: removing buffer `%s'" entry)))
	 (unless (or preview
		     (and interactive
			  (not (y-or-n-p (format "rm: delete buffer `%s'? "
						 entry)))))
	   (eshell-funcalln 'kill-buffer entry)))
John Wiegley's avatar
John Wiegley committed
272
	((eshell-processp entry)
Gerd Moellmann's avatar
Gerd Moellmann committed
273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
	 (if verbose
	     (eshell-printn (format "rm: killing process `%s'" entry)))
	 (unless (or preview
		     (and interactive
			  (not (y-or-n-p (format "rm: kill process `%s'? "
						 entry)))))
	   (eshell-funcalln 'kill-process entry)))
	((symbolp entry)
	 (if verbose
	     (eshell-printn (format "rm: uninterning symbol `%s'" entry)))
	 (unless
	     (or preview
		 (and interactive
		      (not (y-or-n-p (format "rm: unintern symbol `%s'? "
					     entry)))))
	   (eshell-funcalln 'unintern entry)))
	((stringp entry)
	 (if (and (file-directory-p entry)
		  (not (file-symlink-p entry)))
	     (if (or recursive
		     eshell-rm-removes-directories)
		 (if (or preview
			 (not interactive)
			 (y-or-n-p
			  (format "rm: descend into directory `%s'? "
				  entry)))
		     (eshell-remove-entries nil (list entry) t))
	       (eshell-error (format "rm: %s: is a directory\n" entry)))
	   (eshell-remove-entries nil (list entry) t)))))
     (setq args (cdr args)))
   nil))

305 306
(put 'eshell/rm 'eshell-no-numeric-conversions t)

Gerd Moellmann's avatar
Gerd Moellmann committed
307 308 309 310 311 312 313 314 315 316 317 318 319 320
(defun eshell/mkdir (&rest args)
  "Implementation of mkdir in Lisp."
  (eshell-eval-using-options
   "mkdir" args
   '((?h "help" nil nil "show this usage screen")
     :external "mkdir"
     :show-usage
     :usage "[OPTION] DIRECTORY...
Create the DIRECTORY(ies), if they do not already exist.")
   (while args
     (eshell-funcalln 'make-directory (car args))
     (setq args (cdr args)))
   nil))

321 322
(put 'eshell/mkdir 'eshell-no-numeric-conversions t)

Gerd Moellmann's avatar
Gerd Moellmann committed
323 324 325 326 327 328 329 330 331 332 333 334 335 336
(defun eshell/rmdir (&rest args)
  "Implementation of rmdir in Lisp."
  (eshell-eval-using-options
   "rmdir" args
   '((?h "help" nil nil "show this usage screen")
     :external "rmdir"
     :show-usage
     :usage "[OPTION] DIRECTORY...
Remove the DIRECTORY(ies), if they are empty.")
   (while args
     (eshell-funcalln 'delete-directory (car args))
     (setq args (cdr args)))
   nil))

337 338
(put 'eshell/rmdir 'eshell-no-numeric-conversions t)

339 340 341
(defvar no-dereference)
(defvar preview)
(defvar verbose)
Gerd Moellmann's avatar
Gerd Moellmann committed
342 343 344 345 346

(defvar eshell-warn-dot-directories t)

(defun eshell-shuffle-files (command action files target func deep &rest args)
  "Shuffle around some filesystem entries, using FUNC to do the work."
347
  (let ((attr-target (eshell-file-attributes target))
Gerd Moellmann's avatar
Gerd Moellmann committed
348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363
	(is-dir (or (file-directory-p target)
		    (and preview (not eshell-warn-dot-directories))))
	attr)
    (if (and (not preview) (not is-dir)
	     (> (length files) 1))
	(error "%s: when %s multiple files, last argument must be a directory"
	       command action))
    (while files
      (setcar files (directory-file-name (car files)))
      (cond
       ((string-match "\\`\\.\\.?\\'"
		      (file-name-nondirectory (car files)))
	(if eshell-warn-dot-directories
	    (eshell-error (format "%s: %s: omitting directory\n"
				  command (car files)))))
       ((and attr-target
364 365
	     (or (not (eshell-under-windows-p))
		 (eq system-type 'ms-dos))
366 367
	     (setq attr (eshell-file-attributes (car files)))
	     (nth 10 attr-target) (nth 10 attr)
368 369
	     ;; Use equal, not -, since the inode and the device could
	     ;; cons cells.
370
	     (equal (nth 10 attr-target) (nth 10 attr))
371
	     (nth 11 attr-target) (nth 11 attr)
372
	     (equal (nth 11 attr-target) (nth 11 attr)))
Gerd Moellmann's avatar
Gerd Moellmann committed
373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393
	(eshell-error (format "%s: `%s' and `%s' are the same file\n"
			      command (car files) target)))
       (t
	(let ((source (car files))
	      (target (if is-dir
			  (expand-file-name
			   (file-name-nondirectory (car files)) target)
			target))
	      link)
	  (if (and (file-directory-p source)
		   (or (not no-dereference)
		       (not (file-symlink-p source)))
		   (not (memq func '(make-symbolic-link
				     add-name-to-file))))
	      (if (and (eq func 'copy-file)
		       (not recursive))
		  (eshell-error (format "%s: %s: omitting directory\n"
					command (car files)))
		(let (eshell-warn-dot-directories)
		  (if (and (not deep)
			   (eq func 'rename-file)
394 395 396 397 398 399 400 401 402 403
			   ;; Use equal, since the device might be a
			   ;; cons cell.
			   (equal (nth 11 (eshell-file-attributes
					   (file-name-directory
					    (directory-file-name
					     (expand-file-name source)))))
				  (nth 11 (eshell-file-attributes
					   (file-name-directory
					    (directory-file-name
					     (expand-file-name target)))))))
Gerd Moellmann's avatar
Gerd Moellmann committed
404 405 406 407 408 409 410 411
		      (apply 'eshell-funcalln func source target args)
		  (unless (file-directory-p target)
		    (if verbose
			(eshell-printn
			 (format "%s: making directory %s"
				 command target)))
		    (unless preview
		      (eshell-funcalln 'make-directory target)))
John Wiegley's avatar
John Wiegley committed
412 413 414 415 416 417 418 419
		  (apply 'eshell-shuffle-files
			 command action
			 (mapcar
			  (function
			   (lambda (file)
			     (concat source "/" file)))
			  (directory-files source))
			 target func t args)
Gerd Moellmann's avatar
Gerd Moellmann committed
420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465
		  (when (eq func 'rename-file)
		    (if verbose
			(eshell-printn
			 (format "%s: deleting directory %s"
				 command source)))
		    (unless preview
		      (eshell-funcalln 'delete-directory source))))))
	    (if verbose
		(eshell-printn (format "%s: %s -> %s" command
				       source target)))
	    (unless preview
	      (if (and no-dereference
		       (setq link (file-symlink-p source)))
		  (progn
		    (apply 'eshell-funcalln 'make-symbolic-link
			   link target args)
		    (if (eq func 'rename-file)
			(if (and (file-directory-p source)
				 (not (file-symlink-p source)))
			    (eshell-funcalln 'delete-directory source)
			  (eshell-funcalln 'delete-file source))))
		(apply 'eshell-funcalln func source target args)))))))
      (setq files (cdr files)))))

(defun eshell-shorthand-tar-command (command args)
  "Rewrite `cp -v dir a.tar.gz' to `tar cvzf a.tar.gz dir'."
  (let* ((archive (car (last args)))
	 (tar-args
	  (cond ((string-match "z2" archive) "If")
		((string-match "gz" archive) "zf")
		((string-match "\\(az\\|Z\\)" archive) "Zf")
		(t "f"))))
    (if (file-exists-p archive)
	(setq tar-args (concat "u" tar-args))
      (setq tar-args (concat "c" tar-args)))
    (if verbose
	(setq tar-args (concat "v" tar-args)))
    (if (equal command "mv")
	(setq tar-args (concat "--remove-files -" tar-args)))
    ;; truncate the archive name from the arguments
    (setcdr (last args 2) nil)
    (throw 'eshell-replace-command
	   (eshell-parse-command
	    (format "tar %s %s" tar-args archive) args))))

;; this is to avoid duplicating code...
John Wiegley's avatar
John Wiegley committed
466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494
(defmacro eshell-mvcpln-template (command action func query-var
					  force-var &optional preserve)
  `(let ((len (length args)))
     (if (or (= len 0)
	     (and (= len 1) (null eshell-default-target-is-dot)))
	 (error "%s: missing destination file or directory" ,command))
     (if (= len 1)
	 (nconc args '(".")))
     (setq args (eshell-stringify-list (eshell-flatten-list args)))
     (if (and ,(not (equal command "ln"))
	      (string-match eshell-tar-regexp (car (last args)))
	      (or (> (length args) 2)
		  (and (file-directory-p (car args))
		       (or (not no-dereference)
			   (not (file-symlink-p (car args)))))))
	 (eshell-shorthand-tar-command ,command args)
       (let ((target (car (last args)))
	     ange-cache)
	 (setcdr (last args 2) nil)
	 (eshell-shuffle-files
	  ,command ,action args target ,func nil
	  ,@(append
	     `((if (and (or interactive
			    ,query-var)
			(not force))
		   1 (or force ,force-var)))
	     (if preserve
		 (list preserve)))))
       nil)))
Gerd Moellmann's avatar
Gerd Moellmann committed
495 496 497 498 499 500 501 502 503 504 505 506 507 508

(defun eshell/mv (&rest args)
  "Implementation of mv in Lisp."
  (eshell-eval-using-options
   "mv" args
   '((?f "force" nil force
	 "remove existing destinations, never prompt")
     (?i "interactive" nil interactive
	 "request confirmation if target already exists")
     (?n "preview" nil preview
	 "don't change anything on disk")
     (?v "verbose" nil verbose
	 "explain what is being done")
     (nil "help" nil nil "show this usage screen")
John Wiegley's avatar
John Wiegley committed
509
     :preserve-args
Gerd Moellmann's avatar
Gerd Moellmann committed
510 511 512 513 514 515 516
     :external "mv"
     :show-usage
     :usage "[OPTION]... SOURCE DEST
   or: mv [OPTION]... SOURCE... DIRECTORY
Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY.
\[OPTION] DIRECTORY...")
   (let ((no-dereference t))
John Wiegley's avatar
John Wiegley committed
517 518 519
     (eshell-mvcpln-template "mv" "moving" 'rename-file
			     eshell-mv-interactive-query
			     eshell-mv-overwrite-files))))
Gerd Moellmann's avatar
Gerd Moellmann committed
520

521 522
(put 'eshell/mv 'eshell-no-numeric-conversions t)

Gerd Moellmann's avatar
Gerd Moellmann committed
523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543
(defun eshell/cp (&rest args)
  "Implementation of cp in Lisp."
  (eshell-eval-using-options
   "cp" args
   '((?a "archive" nil archive
	 "same as -dpR")
     (?d "no-dereference" nil no-dereference
	 "preserve links")
     (?f "force" nil force
	 "remove existing destinations, never prompt")
     (?i "interactive" nil interactive
	 "request confirmation if target already exists")
     (?n "preview" nil preview
	 "don't change anything on disk")
     (?p "preserve" nil preserve
	 "preserve file attributes if possible")
     (?R "recursive" nil recursive
	 "copy directories recursively")
     (?v "verbose" nil verbose
	 "explain what is being done")
     (nil "help" nil nil "show this usage screen")
John Wiegley's avatar
John Wiegley committed
544
     :preserve-args
Gerd Moellmann's avatar
Gerd Moellmann committed
545 546 547 548 549 550 551
     :external "cp"
     :show-usage
     :usage "[OPTION]... SOURCE DEST
   or:  cp [OPTION]... SOURCE... DIRECTORY
Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.")
   (if archive
       (setq preserve t no-dereference t recursive t))
John Wiegley's avatar
John Wiegley committed
552 553 554
   (eshell-mvcpln-template "cp" "copying" 'copy-file
			   eshell-cp-interactive-query
			   eshell-cp-overwrite-files preserve)))
Gerd Moellmann's avatar
Gerd Moellmann committed
555

556 557
(put 'eshell/cp 'eshell-no-numeric-conversions t)

Gerd Moellmann's avatar
Gerd Moellmann committed
558 559 560 561 562 563 564
(defun eshell/ln (&rest args)
  "Implementation of ln in Lisp."
  (eshell-eval-using-options
   "ln" args
   '((?h "help" nil nil "show this usage screen")
     (?s "symbolic" nil symbolic
	 "make symbolic links instead of hard links")
John Wiegley's avatar
John Wiegley committed
565 566
     (?i "interactive" nil interactive
	 "request confirmation if target already exists")
Gerd Moellmann's avatar
Gerd Moellmann committed
567 568 569 570
     (?f "force" nil force "remove existing destinations, never prompt")
     (?n "preview" nil preview
	 "don't change anything on disk")
     (?v "verbose" nil verbose "explain what is being done")
John Wiegley's avatar
John Wiegley committed
571
     :preserve-args
Gerd Moellmann's avatar
Gerd Moellmann committed
572 573 574 575 576 577 578 579
     :external "ln"
     :show-usage
     :usage "[OPTION]... TARGET [LINK_NAME]
   or:  ln [OPTION]... TARGET... DIRECTORY
Create a link to the specified TARGET with optional LINK_NAME.  If there is
more than one TARGET, the last argument must be a directory;  create links
in DIRECTORY to each TARGET.  Create hard links by default, symbolic links
with '--symbolic'.  When creating hard links, each TARGET must exist.")
John Wiegley's avatar
John Wiegley committed
580 581 582 583 584 585 586
   (let ((no-dereference t))
     (eshell-mvcpln-template "ln" "linking"
			     (if symbolic
				 'make-symbolic-link
			       'add-name-to-file)
			     eshell-ln-interactive-query
			     eshell-ln-overwrite-files))))
Gerd Moellmann's avatar
Gerd Moellmann committed
587

588 589
(put 'eshell/ln 'eshell-no-numeric-conversions t)

Gerd Moellmann's avatar
Gerd Moellmann committed
590
(defun eshell/cat (&rest args)
591 592 593
  "Implementation of cat in Lisp.
If in a pipeline, or the file is not a regular file, directory or
symlink, then revert to the system's definition of cat."
John Wiegley's avatar
John Wiegley committed
594
  (setq args (eshell-stringify-list (eshell-flatten-list args)))
595 596 597
  (if (or eshell-in-pipeline-p
	  (catch 'special
	    (eshell-for arg args
598 599 600 601 602 603
	      (unless (or (and (stringp arg)
			       (> (length arg) 0)
			       (eq (aref arg 0) ?-))
			  (let ((attrs (eshell-file-attributes arg)))
			    (and attrs (memq (aref (nth 8 attrs) 0)
					     '(?d ?l ?-)))))
604 605 606 607 608 609 610 611
		(throw 'special t)))))
      (let ((ext-cat (eshell-search-path "cat")))
	(if ext-cat
	    (throw 'eshell-replace-command
		   (eshell-parse-command ext-cat args))
	  (if eshell-in-pipeline-p
	      (error "Eshell's `cat' does not work in pipelines")
	    (error "Eshell's `cat' cannot display one of the files given"))))
Gerd Moellmann's avatar
Gerd Moellmann committed
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639
    (eshell-init-print-buffer)
    (eshell-eval-using-options
     "cat" args
     '((?h "help" nil nil "show this usage screen")
       :external "cat"
       :show-usage
       :usage "[OPTION] FILE...
Concatenate FILE(s), or standard input, to standard output.")
     (eshell-for file args
       (if (string= file "-")
	   (throw 'eshell-external
		  (eshell-external-command "cat" args))))
     (let ((curbuf (current-buffer)))
       (eshell-for file args
	 (with-temp-buffer
	   (insert-file-contents file)
	   (goto-char (point-min))
	   (while (not (eobp))
	     (let ((str (buffer-substring
			 (point) (min (1+ (line-end-position))
				      (point-max)))))
	       (with-current-buffer curbuf
		 (eshell-buffered-print str)))
	     (forward-line)))))
     (eshell-flush)
     ;; if the file does not end in a newline, do not emit one
     (setq eshell-ensure-newline-p nil))))

640 641
(put 'eshell/cat 'eshell-no-numeric-conversions t)

Gerd Moellmann's avatar
Gerd Moellmann committed
642 643 644 645 646 647 648 649 650 651 652 653
;; special front-end functions for compilation-mode buffers

(defun eshell/make (&rest args)
  "Use `compile' to do background makes."
  (if (and eshell-current-subjob-p
	   (eshell-interactive-output-p))
      (let ((compilation-process-setup-function
	     (list 'lambda nil
		   (list 'setq 'process-environment
			 (list 'quote (eshell-copy-environment))))))
	(compile (concat "make " (eshell-flatten-and-stringify args))))
    (throw 'eshell-replace-command
John Wiegley's avatar
John Wiegley committed
654 655
	   (eshell-parse-command "*make" (eshell-stringify-list
					  (eshell-flatten-list args))))))
Gerd Moellmann's avatar
Gerd Moellmann committed
656

657 658
(put 'eshell/make 'eshell-no-numeric-conversions t)

Gerd Moellmann's avatar
Gerd Moellmann committed
659 660 661 662 663 664 665 666 667 668
(defun eshell-occur-mode-goto-occurrence ()
  "Go to the occurrence the current line describes."
  (interactive)
  (let ((pos (occur-mode-find-occurrence)))
    (pop-to-buffer (marker-buffer pos))
    (goto-char (marker-position pos))))

(defun eshell-occur-mode-mouse-goto (event)
  "In Occur mode, go to the occurrence whose line you click on."
  (interactive "e")
669
  (let (pos)
Gerd Moellmann's avatar
Gerd Moellmann committed
670 671 672 673
    (save-excursion
      (set-buffer (window-buffer (posn-window (event-end event))))
      (save-excursion
	(goto-char (posn-point (event-end event)))
674
	(setq pos (occur-mode-find-occurrence))))
Gerd Moellmann's avatar
Gerd Moellmann committed
675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
    (pop-to-buffer (marker-buffer pos))
    (goto-char (marker-position pos))))

(defun eshell-poor-mans-grep (args)
  "A poor version of grep that opens every file and uses `occur'.
This eats up memory, since it leaves the buffers open (to speed future
searches), and it's very slow.  But, if your system has no grep
available..."
  (save-selected-window
    (let ((default-dir default-directory))
      (with-current-buffer (get-buffer-create "*grep*")
	(let ((inhibit-read-only t)
	      (default-directory default-dir))
	  (erase-buffer)
	  (occur-mode)
John Wiegley's avatar
John Wiegley committed
690 691
	  (let ((files (eshell-stringify-list
			(eshell-flatten-list (cdr args))))
Gerd Moellmann's avatar
Gerd Moellmann committed
692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
		(inhibit-redisplay t)
		string)
	    (when (car args)
	      (if (get-buffer "*Occur*")
		  (kill-buffer (get-buffer "*Occur*")))
	      (setq string nil)
	      (while files
		(with-current-buffer (find-file-noselect (car files))
		  (save-excursion
		    (ignore-errors
		      (occur (car args))))
		  (if (get-buffer "*Occur*")
		      (with-current-buffer (get-buffer "*Occur*")
			(setq string (buffer-string))
			(kill-buffer (current-buffer)))))
		(if string (insert string))
		(setq string nil
		      files (cdr files)))))
	  (local-set-key [mouse-2] 'eshell-occur-mode-mouse-goto)
	  (local-set-key [(control ?c) (control ?c)]
			 'eshell-occur-mode-goto-occurrence)
	  (local-set-key [(control ?m)]
			 'eshell-occur-mode-goto-occurrence)
	  (local-set-key [return] 'eshell-occur-mode-goto-occurrence)
	  (pop-to-buffer (current-buffer) t)
	  (goto-char (point-min))
	  (resize-temp-buffer-window))))))

(defun eshell-grep (command args &optional maybe-use-occur)
  "Generic service function for the various grep aliases.
It calls Emacs' grep utility if the command is not redirecting output,
and if it's not part of a command pipeline.  Otherwise, it calls the
external command."
  (if (and maybe-use-occur eshell-no-grep-available)
      (eshell-poor-mans-grep args)
    (if (or eshell-plain-grep-behavior
	    (not (and (eshell-interactive-output-p)
		      (not eshell-in-pipeline-p)
		      (not eshell-in-subcommand-p))))
	(throw 'eshell-replace-command
John Wiegley's avatar
John Wiegley committed
732
	       (eshell-parse-command (concat "*" command)
John Wiegley's avatar
John Wiegley committed
733 734
				     (eshell-stringify-list
				      (eshell-flatten-list args))))
735
      (let* ((args (mapconcat 'identity
Gerd Moellmann's avatar
Gerd Moellmann committed
736
			      (mapcar 'shell-quote-argument
John Wiegley's avatar
John Wiegley committed
737 738
				      (eshell-stringify-list
				       (eshell-flatten-list args)))
Gerd Moellmann's avatar
Gerd Moellmann committed
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
			      " "))
	     (cmd (progn
		    (set-text-properties 0 (length args)
					 '(invisible t) args)
		    (format "%s -n %s" command args)))
	     compilation-scroll-output)
	(grep cmd)))))

(defun eshell/grep (&rest args)
  "Use Emacs grep facility instead of calling external grep."
  (eshell-grep "grep" args t))

(defun eshell/egrep (&rest args)
  "Use Emacs grep facility instead of calling external egrep."
  (eshell-grep "egrep" args t))

(defun eshell/fgrep (&rest args)
  "Use Emacs grep facility instead of calling external fgrep."
  (eshell-grep "fgrep" args t))

(defun eshell/agrep (&rest args)
  "Use Emacs grep facility instead of calling external agrep."
  (eshell-grep "agrep" args))

(defun eshell/glimpse (&rest args)
  "Use Emacs grep facility instead of calling external glimpse."
  (let (null-device)
    (eshell-grep "glimpse" (append '("-z" "-y") args))))

;; completions rules for some common UNIX commands

(defsubst eshell-complete-hostname ()
  "Complete a command that wants a hostname for an argument."
  (pcomplete-here (eshell-read-host-names)))

(defun eshell-complete-host-reference ()
  "If there is a host reference, complete it."
  (let ((arg (pcomplete-actual-arg))
	index)
    (when (setq index (string-match "@[a-z.]*\\'" arg))
      (setq pcomplete-stub (substring arg (1+ index))
	    pcomplete-last-completion-raw t)
      (throw 'pcomplete-completions (eshell-read-host-names)))))

(defalias 'pcomplete/ftp    'eshell-complete-hostname)
(defalias 'pcomplete/ncftp  'eshell-complete-hostname)
(defalias 'pcomplete/ping   'eshell-complete-hostname)
(defalias 'pcomplete/rlogin 'eshell-complete-hostname)

(defun pcomplete/telnet ()
  (require 'pcmpl-unix)
  (pcomplete-opt "xl(pcmpl-unix-user-names)")
  (eshell-complete-hostname))

(defun pcomplete/rsh ()
  "Complete `rsh', which, after the user and hostname, is like xargs."
  (require 'pcmpl-unix)
  (pcomplete-opt "l(pcmpl-unix-user-names)")
  (eshell-complete-hostname)
  (pcomplete-here (funcall pcomplete-command-completion-function))
  (funcall (or (pcomplete-find-completion-function (pcomplete-arg 1))
	       pcomplete-default-completion-function)))

(defalias 'pcomplete/ssh 'pcomplete/rsh)

804 805 806 807 808 809 810 811
(defvar block-size)
(defvar by-bytes)
(defvar dereference-links)
(defvar grand-total)
(defvar human-readable)
(defvar max-depth)
(defvar only-one-filesystem)
(defvar show-all)
Gerd Moellmann's avatar
Gerd Moellmann committed
812 813 814 815 816 817 818 819 820 821 822 823 824

(defsubst eshell-du-size-string (size)
  (let* ((str (eshell-printable-size size human-readable block-size t))
	 (len (length str)))
    (concat str (if (< len 8)
		    (make-string (- 8 len) ? )))))

(defun eshell-du-sum-directory (path depth)
  "Summarize PATH, and its member directories."
  (let ((entries (eshell-directory-files-and-attributes path))
	(size 0.0))
    (while entries
      (unless (string-match "\\`\\.\\.?\\'" (caar entries))
825
	(let* ((entry (concat path "/"
Gerd Moellmann's avatar
Gerd Moellmann committed
826 827 828 829 830
			      (caar entries)))
	       (symlink (and (stringp (cadr (car entries)))
			     (cadr (car entries)))))
	  (unless (or (and symlink (not dereference-links))
		      (and only-one-filesystem
John Wiegley's avatar
John Wiegley committed
831 832
			   (/= only-one-filesystem
			       (nth 12 (car entries)))))
Gerd Moellmann's avatar
Gerd Moellmann committed
833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854
	    (if symlink
		(setq entry symlink))
	    (setq size
		  (+ size
		     (if (eq t (cadr (car entries)))
			 (eshell-du-sum-directory entry (1+ depth))
		       (let ((file-size (nth 8 (car entries))))
			 (prog1
			     file-size
			   (if show-all
			       (eshell-print
				(concat (eshell-du-size-string file-size)
					entry "\n")))))))))))
      (setq entries (cdr entries)))
    (if (or (not max-depth)
	    (= depth max-depth)
	    (= depth 0))
	(eshell-print (concat (eshell-du-size-string size)
			      (directory-file-name path) "\n")))
    size))

(defun eshell/du (&rest args)
John Wiegley's avatar
John Wiegley committed
855
  "Implementation of \"du\" in Lisp, passing ARGS."
856
  (setq args (if args
John Wiegley's avatar
John Wiegley committed
857
		 (eshell-stringify-list (eshell-flatten-list args))
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
	       '(".")))
  (let ((ext-du (eshell-search-path "du")))
    (if (and ext-du
	     (not (catch 'have-ange-path
		    (eshell-for arg args
		      (if (eq (find-file-name-handler (expand-file-name arg)
						      'directory-files)
			      'ange-ftp-hook-function)
			  (throw 'have-ange-path t))))))
	(throw 'eshell-replace-command
	       (eshell-parse-command ext-du args))
      (eshell-eval-using-options
       "du" args
       '((?a "all" nil show-all
	     "write counts for all files, not just directories")
	 (nil "block-size" t block-size
	      "use SIZE-byte blocks (i.e., --block-size SIZE)")
	 (?b "bytes" nil by-bytes
	     "print size in bytes")
	 (?c "total" nil grand-total
	     "produce a grand total")
	 (?d "max-depth" t max-depth
	     "display data only this many levels of data")
	 (?h "human-readable" 1024 human-readable
	     "print sizes in human readable format")
	 (?H "is" 1000 human-readable
	     "likewise, but use powers of 1000 not 1024")
	 (?k "kilobytes" 1024 block-size
	     "like --block-size 1024")
	 (?L "dereference" nil dereference-links
	     "dereference all symbolic links")
	 (?m "megabytes" 1048576 block-size
	     "like --block-size 1048576")
	 (?s "summarize" 0 max-depth
	     "display only a total for each argument")
	 (?x "one-file-system" nil only-one-filesystem
	     "skip directories on different filesystems")
	 (nil "help" nil nil
	      "show this usage screen")
	 :external "du"
	 :usage "[OPTION]... FILE...
Gerd Moellmann's avatar
Gerd Moellmann committed
899
Summarize disk usage of each FILE, recursively for directories.")
900 901 902
       (unless by-bytes
	 (setq block-size (or block-size 1024)))
       (if (and max-depth (stringp max-depth))
903
	   (setq max-depth (string-to-number max-depth)))
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918
       ;; filesystem support means nothing under Windows
       (if (eshell-under-windows-p)
	   (setq only-one-filesystem nil))
       (let ((size 0.0) ange-cache)
	 (while args
	   (if only-one-filesystem
	       (setq only-one-filesystem
		     (nth 11 (eshell-file-attributes
			      (file-name-as-directory (car args))))))
	   (setq size (+ size (eshell-du-sum-directory
			       (directory-file-name (car args)) 0)))
	   (setq args (cdr args)))
	 (if grand-total
	     (eshell-print (concat (eshell-du-size-string size)
				   "total\n"))))))))
Gerd Moellmann's avatar
Gerd Moellmann committed
919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954

(defvar eshell-time-start nil)

(defun eshell-show-elapsed-time ()
  (let ((elapsed (format "%.3f secs\n"
			 (- (eshell-time-to-seconds (current-time))
			    eshell-time-start))))
    (set-text-properties 0 (length elapsed) '(face bold) elapsed)
    (eshell-interactive-print elapsed))
  (remove-hook 'eshell-post-command-hook 'eshell-show-elapsed-time t))

(defun eshell/time (&rest args)
  "Implementation of \"time\" in Lisp."
  (let ((time-args (copy-alist args))
	(continue t)
	last-arg)
    (while (and continue args)
      (if (not (string-match "^-" (car args)))
	  (progn
	    (if last-arg
		(setcdr last-arg nil)
	      (setq args '("")))
	    (setq continue nil))
	(setq last-arg args
	      args (cdr args))))
    (eshell-eval-using-options
     "time" args
     '((?h "help" nil nil "show this usage screen")
       :external "time"
       :show-usage
       :usage "COMMAND...
Show wall-clock time elapsed during execution of COMMAND.")
     (setq eshell-time-start (eshell-time-to-seconds (current-time)))
     (add-hook 'eshell-post-command-hook 'eshell-show-elapsed-time nil t)
     ;; after setting
     (throw 'eshell-replace-command
955 956 957 958
	    (eshell-parse-command (car time-args)
;;; http://lists.gnu.org/archive/html/bug-gnu-emacs/2007-08/msg00205.html
				  (eshell-stringify-list
				   (eshell-flatten-list (cdr time-args))))))))
Gerd Moellmann's avatar
Gerd Moellmann committed
959 960 961 962 963 964 965 966 967 968 969

(defalias 'eshell/whoami 'user-login-name)

(defvar eshell-diff-window-config nil)

(defun eshell-diff-quit ()
  "Restore the window configuration previous to diff'ing."
  (interactive)
  (if eshell-diff-window-config
      (set-window-configuration eshell-diff-window-config)))

970 971
(defun nil-blank-string (string)
  "Return STRING, or nil if STRING contains only non-blank characters."
972
  (cond
973 974
    ((string-match "[^[:blank:]]" string) string)
    (nil)))
975

Gerd Moellmann's avatar
Gerd Moellmann committed
976 977
(defun eshell/diff (&rest args)
  "Alias \"diff\" to call Emacs `diff' function."
John Wiegley's avatar
John Wiegley committed
978
  (let ((orig-args (eshell-stringify-list (eshell-flatten-list args))))
John Wiegley's avatar
John Wiegley committed
979 980 981 982 983 984
    (if (or eshell-plain-diff-behavior
	    (not (and (eshell-interactive-output-p)
		      (not eshell-in-pipeline-p)
		      (not eshell-in-subcommand-p))))
	(throw 'eshell-replace-command
	       (eshell-parse-command "*diff" orig-args))
985
      (setq args (copy-sequence orig-args))
John Wiegley's avatar
John Wiegley committed
986 987 988 989 990 991 992 993 994 995 996
      (if (< (length args) 2)
	  (throw 'eshell-replace-command
		 (eshell-parse-command "*diff" orig-args)))
      (let ((old (car (last args 2)))
	    (new (car (last args)))
	    (config (current-window-configuration)))
	(if (= (length args) 2)
	    (setq args nil)
	  (setcdr (last args 3) nil))
	(with-current-buffer
	    (condition-case err
997 998
		(diff old new
		      (nil-blank-string (eshell-flatten-and-stringify args)))
John Wiegley's avatar
John Wiegley committed
999 1000 1001 1002
	      (error
	       (throw 'eshell-replace-command
		      (eshell-parse-command "*diff" orig-args))))
	  (when (fboundp 'diff-mode)
1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016
	    (make-local-variable 'compilation-finish-functions)
	    (add-hook
	     'compilation-finish-functions
	     `(lambda (buff msg)
		(with-current-buffer buff
		  (diff-mode)
		  (set (make-local-variable 'eshell-diff-window-config)
		       ,config)
		  (local-set-key [?q] 'eshell-diff-quit)
		  (if (fboundp 'turn-on-font-lock-if-enabled)
		      (turn-on-font-lock-if-enabled))
		  (goto-char (point-min))))))
	  (pop-to-buffer (current-buffer))))))
  nil)
Gerd Moellmann's avatar
Gerd Moellmann committed
1017

1018 1019
(put 'eshell/diff 'eshell-no-numeric-conversions t)

Gerd Moellmann's avatar
Gerd Moellmann committed
1020 1021 1022 1023 1024 1025 1026 1027 1028
(defun eshell/locate (&rest args)
  "Alias \"locate\" to call Emacs `locate' function."
  (if (or eshell-plain-locate-behavior
	  (not (and (eshell-interactive-output-p)
		    (not eshell-in-pipeline-p)
		    (not eshell-in-subcommand-p)))
	  (and (stringp (car args))
	       (string-match "^-" (car args))))
      (throw 'eshell-replace-command
John Wiegley's avatar
John Wiegley committed
1029 1030
	     (eshell-parse-command "*locate" (eshell-stringify-list
					      (eshell-flatten-list args))))
Gerd Moellmann's avatar
Gerd Moellmann committed
1031 1032 1033 1034
    (save-selected-window
      (let ((locate-history-list (list (car args))))
	(locate-with-filter (car args) (cadr args))))))

1035 1036
(put 'eshell/locate 'eshell-no-numeric-conversions t)

Gerd Moellmann's avatar
Gerd Moellmann committed
1037 1038 1039
(defun eshell/occur (&rest args)
  "Alias \"occur\" to call Emacs `occur' function."
  (let ((inhibit-read-only t))
John Wiegley's avatar
John Wiegley committed
1040 1041 1042
    (if (> (length args) 2)
	(error "usage: occur: (REGEXP &optional NLINES)")
      (apply 'occur args))))
Gerd Moellmann's avatar
Gerd Moellmann committed
1043

1044 1045
(put 'eshell/occur 'eshell-no-numeric-conversions t)

1046
(provide 'em-unix)
Gerd Moellmann's avatar
Gerd Moellmann committed
1047

1048 1049 1050 1051
;; Local Variables:
;; generated-autoload-file: "esh-groups.el"
;; End:

1052
;; arch-tag: 2462edd2-a76a-4cf2-897d-92e9a82ac1c9
Gerd Moellmann's avatar
Gerd Moellmann committed
1053
;;; em-unix.el ends here