em-cmpl.el 16.1 KB
Newer Older
Gerd Moellmann's avatar
Gerd Moellmann committed
1 2
;;; em-cmpl --- completion using the TAB key

3
;; Copyright (C) 1999, 2000 Free Software Foundation
Gerd Moellmann's avatar
Gerd Moellmann committed
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 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 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

(provide 'em-cmpl)

(eval-when-compile (require 'esh-maint))

(defgroup eshell-cmpl nil
  "This module provides a programmable completion function bound to
the TAB key, which allows for completing command names, file names,
variable names, arguments, etc."
  :tag "Argument completion"
  :group 'eshell-module)

;;; Commentary:

;; Eshell, by using the pcomplete package, provides a full
;; programmable completion facility that is comparable to shells like
;; tcsh or zsh.
;;
;; Completions are context-sensitive, which means that pressing <TAB>
;; after the command 'rmdir' will result in a list of directories,
;; while doing so after 'rm' will result in a list of all file
;; entries.
;;
;; Many builtin completion rules are provided, for commands such as
;; `cvs', or RedHat's `rpm' utility.  Adding new completion rules is
;; no more difficult than writing a plain Lisp functions, and they can
;; be debugged, profiled, and compiled using exactly the same
;; facilities (since in fact, they *are* just Lisp functions).  See
;; the definition of the function `pcomplete/make' for an example of
;; how to write a completion function.
;;
;; The completion facility is very easy to use.  Just press TAB.  If
;; there are a large number of possible completions, a buffer will
;; appearing showing a list of them.  Completions may be selected from
;; that buffer using the mouse.  If no completion is selected, and the
;; user starts doing something else, the display buffer will
;; automatically disappear.
;;
;; If the list of possible completions is very small, Eshell will
;; "cycle" through them, selecting a different entry each time <TAB>
;; is pressed.  <S-TAB> may be used to cycle in the opposite
;; direction.
;;
;; Glob patterns can also be cycled.  For example, entering 'echo
;; x*<tab>' will cycle through all the filenames beginning with 'x'.
;; This is done because the glob list is treated as though it were a
;; list of possible completions.  Pressing <C-c SPC> will insert all
;; of the matching glob patterns at point.
;;
;; If a Lisp form is being entered, <TAB> will complete the Lisp
;; symbol name, in exactly the same way that <M-TAB> does in Emacs
;; Lisp mode.
;;
;; The list of possible completions can be viewed at any point by
;; pressing <M-?>.
;;
;; Finally, context-related help can be accessed by pressing <C-c i>.
;; This only works well if the completion function has provided Eshell
;; with sufficient pointers to locate the relevant help text.

;;; User Variables:

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

(defcustom eshell-show-lisp-completions nil
  "*If non-nil, include Lisp functions in the command completion list.
If this variable is nil, Lisp completion can still be done in command
position by using M-TAB instead of TAB."
  :type 'boolean
  :group 'eshell-cmpl)

(defcustom eshell-show-lisp-alternatives t
  "*If non-nil, and no other completions found, show Lisp functions.
Setting this variable means nothing if `eshell-show-lisp-completions'
is non-nil."
  :type 'boolean
  :group 'eshell-cmpl)

(defcustom eshell-no-completion-during-jobs t
  "*If non-nil, don't allow completion while a process is running."
  :type 'boolean
  :group 'eshell-cmpl)

(defcustom eshell-command-completions-alist
  '(("acroread" . "\\.pdf\\'")
    ("xpdf"     . "\\.pdf\\'")
    ("ar"       . "\\.[ao]\\'")
    ("gcc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
    ("g++"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
    ("cc"       . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
    ("CC"       . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
    ("acc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
    ("bcc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
    ("objdump"  . "\\(\\`[^.]*\\|\\.[ao]\\)\\'")
    ("nm"       . "\\(\\`[^.]*\\|\\.[ao]\\)\\'")
    ("gdb"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
    ("dbx"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
    ("sdb"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
    ("adb"      . "\\`\\([^.]*\\|a\\.out\\)\\'"))
  "*An alist that defines simple argument type correlations.
This is provided for common commands, as a simplistic alternative
to writing a completion function."
  :type '(repeat (cons string regexp))
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-file-ignore "~\\'"
  (documentation-property 'pcomplete-file-ignore
			  'variable-documentation)
  :type (get 'pcomplete-file-ignore 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-dir-ignore
  (format "\\`\\(\\.\\.?\\|CVS\\)%c\\'" directory-sep-char)
  (documentation-property 'pcomplete-dir-ignore
			  'variable-documentation)
  :type (get 'pcomplete-dir-ignore 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-ignore-case (eshell-under-windows-p)
  (documentation-property 'pcomplete-ignore-case
			  'variable-documentation)
  :type (get 'pcomplete-ignore-case 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-autolist nil
  (documentation-property 'pcomplete-autolist
			  'variable-documentation)
  :type (get 'pcomplete-autolist 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-suffix-list (list directory-sep-char ?:)
  (documentation-property 'pcomplete-suffix-list
			  'variable-documentation)
  :type (get 'pcomplete-suffix-list 'custom-type)
  :group 'pcomplete)

(defcustom eshell-cmpl-recexact nil
  (documentation-property 'pcomplete-recexact
			  'variable-documentation)
  :type (get 'pcomplete-recexact 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-man-function 'man
  (documentation-property 'pcomplete-man-function
			  'variable-documentation)
  :type (get 'pcomplete-man-function 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-compare-entry-function 'file-newer-than-file-p
  (documentation-property 'pcomplete-compare-entry-function
			  'variable-documentation)
  :type (get 'pcomplete-compare-entry-function 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-expand-before-complete nil
  (documentation-property 'pcomplete-expand-before-complete
			  'variable-documentation)
  :type (get 'pcomplete-expand-before-complete 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-cycle-completions t
  (documentation-property 'pcomplete-cycle-completions
			  'variable-documentation)
  :type (get 'pcomplete-cycle-completions 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-cycle-cutoff-length 5
  (documentation-property 'pcomplete-cycle-cutoff-length
			  'variable-documentation)
  :type (get 'pcomplete-cycle-cutoff-length 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-restore-window-delay 1
  (documentation-property 'pcomplete-restore-window-delay
			  'variable-documentation)
  :type (get 'pcomplete-restore-window-delay 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-command-completion-function
  (function
   (lambda ()
     (pcomplete-here (eshell-complete-commands-list))))
  (documentation-property 'pcomplete-command-completion-function
			  'variable-documentation)
  :type (get 'pcomplete-command-completion-function 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-cmpl-command-name-function
  'eshell-completion-command-name
  (documentation-property 'pcomplete-command-name-function
			  'variable-documentation)
  :type (get 'pcomplete-command-name-function 'custom-type)
  :group 'eshell-cmpl)

(defcustom eshell-default-completion-function
  (function
   (lambda ()
     (while (pcomplete-here
	     (pcomplete-dirs-or-entries
	      (cdr (assoc (funcall eshell-cmpl-command-name-function)
			  eshell-command-completions-alist)))))))
  (documentation-property 'pcomplete-default-completion-function
			  'variable-documentation)
  :type (get 'pcomplete-default-completion-function 'custom-type)
  :group 'pcomplete)

;;; Functions:

(defun eshell-cmpl-initialize ()
  "Initialize the completions module."
  (unless (fboundp 'pcomplete)
    (load "pcmpl-auto" t t))
  (set (make-local-variable 'pcomplete-command-completion-function)
       eshell-command-completion-function)
  (set (make-local-variable 'pcomplete-command-name-function)
       eshell-cmpl-command-name-function)
  (set (make-local-variable 'pcomplete-default-completion-function)
       eshell-default-completion-function)
  (set (make-local-variable 'pcomplete-parse-arguments-function)
       'eshell-complete-parse-arguments)
  (set (make-local-variable 'pcomplete-file-ignore)
       eshell-cmpl-file-ignore)
  (set (make-local-variable 'pcomplete-dir-ignore)
       eshell-cmpl-dir-ignore)
  (set (make-local-variable 'pcomplete-ignore-case)
       eshell-cmpl-ignore-case)
  (set (make-local-variable 'pcomplete-autolist)
       eshell-cmpl-autolist)
  (set (make-local-variable 'pcomplete-suffix-list)
       eshell-cmpl-suffix-list)
  (set (make-local-variable 'pcomplete-recexact)
       eshell-cmpl-recexact)
  (set (make-local-variable 'pcomplete-man-function)
       eshell-cmpl-man-function)
  (set (make-local-variable 'pcomplete-compare-entry-function)
       eshell-cmpl-compare-entry-function)
  (set (make-local-variable 'pcomplete-expand-before-complete)
       eshell-cmpl-expand-before-complete)
  (set (make-local-variable 'pcomplete-cycle-completions)
       eshell-cmpl-cycle-completions)
  (set (make-local-variable 'pcomplete-cycle-cutoff-length)
       eshell-cmpl-cycle-cutoff-length)
  (set (make-local-variable 'pcomplete-restore-window-delay)
       eshell-cmpl-restore-window-delay)
  ;; `pcomplete-arg-quote-list' should only be set after all the
  ;; load-hooks for any other extension modules have been run, which
  ;; is true at the time `eshell-mode-hook' is run
  (make-local-hook 'eshell-mode-hook)
  (add-hook 'eshell-mode-hook
	    (function
	     (lambda ()
	       (set (make-local-variable 'pcomplete-arg-quote-list)
		    eshell-special-chars-outside-quoting))) nil t)
  (make-local-hook 'pcomplete-quote-arg-hook)
  (add-hook 'pcomplete-quote-arg-hook 'eshell-quote-backslash nil t)
  (define-key eshell-mode-map [(meta tab)] 'lisp-complete-symbol)
  (define-key eshell-mode-map [(meta control ?i)] 'lisp-complete-symbol)
  (define-key eshell-command-map [(meta ?h)] 'eshell-completion-help)
  (define-key eshell-command-map [tab] 'pcomplete-expand-and-complete)
  (define-key eshell-command-map [(control ?i)]
    'pcomplete-expand-and-complete)
  (define-key eshell-command-map [space] 'pcomplete-expand)
  (define-key eshell-command-map [? ] 'pcomplete-expand)
  (define-key eshell-mode-map [tab] 'pcomplete)
  (define-key eshell-mode-map [(control ?i)] 'pcomplete)
  ;; jww (1999-10-19): Will this work on anything but X?
  (if (eshell-under-xemacs-p)
      (define-key eshell-mode-map [iso-left-tab] 'pcomplete-reverse)
    (define-key eshell-mode-map [(shift iso-lefttab)] 'pcomplete-reverse)
    (define-key eshell-mode-map [(shift control ?i)] 'pcomplete-reverse))
  (define-key eshell-mode-map [(meta ??)] 'pcomplete-list))

(defun eshell-completion-command-name ()
  "Return the command name, possibly sans globbing."
  (let ((cmd (file-name-nondirectory (pcomplete-arg 'first))))
    (setq cmd (if (and (> (length cmd) 0)
		       (eq (aref cmd 0) ?*))
		  (substring cmd 1)
		cmd))
    (if (eshell-under-windows-p)
	(file-name-sans-extension cmd)
      cmd)))

(defun eshell-completion-help ()
  (interactive)
  (if (= (point) eshell-last-output-end)
      (describe-prefix-bindings)
    (call-interactively 'pcomplete-help)))

(defun eshell-complete-parse-arguments ()
  "Parse the command line arguments for `pcomplete-argument'."
  (when (and eshell-no-completion-during-jobs
	     (eshell-interactive-process))
    (insert-and-inherit "\t")
    (throw 'pcompleted t))
  (let ((end (point-marker))
	(begin (save-excursion (eshell-bol) (point)))
	(posns (list t))
	args delim)
    (when (memq this-command '(pcomplete-expand
			       pcomplete-expand-and-complete))
      (run-hook-with-args 'eshell-expand-input-functions begin end)
      (if (= begin end)
	  (end-of-line))
      (setq end (point-marker)))
    (if (setq delim
	      (catch 'eshell-incomplete
		(ignore
		 (setq args (eshell-parse-arguments begin end)))))
	(cond ((memq (car delim) '(?\{ ?\<))
	       (setq begin (1+ (cadr delim))
		     args (eshell-parse-arguments begin end)))
	      ((eq (car delim) ?\()
	       (lisp-complete-symbol)
	       (throw 'pcompleted t))
	      (t
	       (insert-and-inherit "\t")
	       (throw 'pcompleted t))))
    (when (get-text-property (1- end) 'comment)
      (insert-and-inherit "\t")
      (throw 'pcompleted t))
    (let ((pos begin))
      (while (< pos end)
	(if (get-text-property pos 'arg-begin)
	    (nconc posns (list pos)))
	(setq pos (1+ pos))))
    (setq posns (cdr posns))
    (assert (= (length args) (length posns)))
    (let ((a args)
	  (i 0)
	  l final)
      (while a
	(if (and (consp (car a))
		 (eq (caar a) 'eshell-operator))
	    (setq l i))
	(setq a (cdr a) i (1+ i)))
      (and l
	   (setq args (nthcdr (1+ l) args)
		 posns (nthcdr (1+ l) posns))))
    (assert (= (length args) (length posns)))
    (when (and args (eq (char-syntax (char-before end)) ? ))
      (nconc args (list ""))
      (nconc posns (list (point))))
    (cons (mapcar
	   (function
	    (lambda (arg)
	      (let ((val
		     (if (listp arg)
			 (let ((result
				(eshell-do-eval
				 (list 'eshell-commands arg) t)))
			   (assert (eq (car result) 'quote))
			   (cadr result))
		       arg)))
		(if (numberp val)
		    (setq val (number-to-string val)))
		(or val ""))))
	   args)
	  posns)))

(defun eshell-complete-commands-list ()
  "Generate list of applicable, visible commands."
  (let ((filename (pcomplete-arg)) glob-name)
    (if (file-name-directory filename)
	(pcomplete-executables)
      (if (and (> (length filename) 0)
	       (eq (aref filename 0) ?*))
	  (setq filename (substring filename 1)
		pcomplete-stub filename
		glob-name t))
      (let* ((paths (split-string (getenv "PATH") path-separator))
	     (cwd (file-name-as-directory
		   (expand-file-name default-directory)))
	     (path "") (comps-in-path ())
	     (file "") (filepath "") (completions ()))
	;; Go thru each path in the search path, finding completions.
	(while paths
	  (setq path (file-name-as-directory
		      (expand-file-name (or (car paths) ".")))
		comps-in-path
		(and (file-accessible-directory-p path)
		     (file-name-all-completions filename path)))
	  ;; Go thru each completion found, to see whether it should
	  ;; be used.
	  (while comps-in-path
	    (setq file (car comps-in-path)
		  filepath (concat path file))
	    (if (and (not (member file completions)) ;
		     (or (string-equal path cwd)
			 (not (file-directory-p filepath)))
		     (file-executable-p filepath))
		(setq completions (cons file completions)))
	    (setq comps-in-path (cdr comps-in-path)))
	  (setq paths (cdr paths)))
	;; Add aliases which are currently visible, and Lisp functions.
	(pcomplete-uniqify-list
	 (if glob-name
	     completions
	   (setq completions
		 (append (and (eshell-using-module 'eshell-alias)
			      (funcall (symbol-function 'eshell-alias-completions)
				       filename))
			 (eshell-winnow-list
			  (mapcar
			   (function
			    (lambda (name)
			      (substring name 7)))
			   (all-completions (concat "eshell/" filename)
					    obarray 'functionp))
			  nil '(eshell-find-alias-function))
			 completions))
	   (append (and (or eshell-show-lisp-completions
			    (and eshell-show-lisp-alternatives
				 (null completions)))
			(all-completions filename obarray 'functionp))
		   completions)))))))

;;; Code:

;;; em-cmpl.el ends here