lisp/eshell/em-cmpl.el

   1 ;;; em-cmpl.el --- completion using the TAB key
   2
   3 ;; Copyright (C) 1999-2012  Free Software Foundation, Inc.
   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 3 of the License, or
  12 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Commentary:
  23
  24 ;; Eshell, by using the pcomplete package, provides a full
  25 ;; programmable completion facility that is comparable to shells like
  26 ;; tcsh or zsh.
  27 ;;
  28 ;; Completions are context-sensitive, which means that pressing <TAB>
  29 ;; after the command 'rmdir' will result in a list of directories,
  30 ;; while doing so after 'rm' will result in a list of all file
  31 ;; entries.
  32 ;;
  33 ;; Many builtin completion rules are provided, for commands such as
  34 ;; `cvs', or RedHat's `rpm' utility.  Adding new completion rules is
  35 ;; no more difficult than writing a plain Lisp functions, and they can
  36 ;; be debugged, profiled, and compiled using exactly the same
  37 ;; facilities (since in fact, they *are* just Lisp functions).  See
  38 ;; the definition of the function `pcomplete/make' for an example of
  39 ;; how to write a completion function.
  40 ;;
  41 ;; The completion facility is very easy to use.  Just press TAB.  If
  42 ;; there are a large number of possible completions, a buffer will
  43 ;; appear showing a list of them.  Completions may be selected from
  44 ;; that buffer using the mouse.  If no completion is selected, and the
  45 ;; user starts doing something else, the display buffer will
  46 ;; automatically disappear.
  47 ;;
  48 ;; If the list of possible completions is very small, Eshell will
  49 ;; "cycle" through them, selecting a different entry each time <TAB>
  50 ;; is pressed.  <S-TAB> may be used to cycle in the opposite
  51 ;; direction.
  52 ;;
  53 ;; Glob patterns can also be cycled.  For example, entering 'echo
  54 ;; x*<tab>' will cycle through all the filenames beginning with 'x'.
  55 ;; This is done because the glob list is treated as though it were a
  56 ;; list of possible completions.  Pressing <C-c SPC> will insert all
  57 ;; of the matching glob patterns at point.
  58 ;;
  59 ;; If a Lisp form is being entered, <TAB> will complete the Lisp
  60 ;; symbol name, in exactly the same way that <M-TAB> does in Emacs
  61 ;; Lisp mode.
  62 ;;
  63 ;; The list of possible completions can be viewed at any point by
  64 ;; pressing <M-?>.
  65 ;;
  66 ;; Finally, context-related help can be accessed by pressing <C-c i>.
  67 ;; This only works well if the completion function has provided Eshell
  68 ;; with sufficient pointers to locate the relevant help text.
  69
  70 ;;; Code:
  71
  72 (eval-when-compile
  73   (require 'cl)
  74   (require 'eshell))
  75 (require 'esh-util)
  76
  77 ;;;###autoload
  78 (eshell-defgroup eshell-cmpl nil
  79   "This module provides a programmable completion function bound to
  80 the TAB key, which allows for completing command names, file names,
  81 variable names, arguments, etc."
  82   :tag "Argument completion"
  83   :group 'eshell-module)
  84
  85 ;;; User Variables:
  86
  87 (defcustom eshell-cmpl-load-hook nil
  88   "A list of functions to run when `eshell-cmpl' is loaded."
  89   :version "24.1"                       ; removed eshell-cmpl-initialize
  90   :type 'hook
  91   :group 'eshell-cmpl)
  92
  93 (defcustom eshell-show-lisp-completions nil
  94   "If non-nil, include Lisp functions in the command completion list.
  95 If this variable is nil, Lisp completion can still be done in command
  96 position by using M-TAB instead of TAB."
  97   :type 'boolean
  98   :group 'eshell-cmpl)
  99
 100 (defcustom eshell-show-lisp-alternatives t
 101   "If non-nil, and no other completions found, show Lisp functions.
 102 Setting this variable means nothing if `eshell-show-lisp-completions'
 103 is non-nil."
 104   :type 'boolean
 105   :group 'eshell-cmpl)
 106
 107 (defcustom eshell-no-completion-during-jobs t
 108   "If non-nil, don't allow completion while a process is running."
 109   :type 'boolean
 110   :group 'eshell-cmpl)
 111
 112 (defcustom eshell-command-completions-alist
 113   '(("acroread" . "\\.pdf\\'")
 114     ("xpdf"     . "\\.pdf\\'")
 115     ("ar"       . "\\.[ao]\\'")
 116     ("gcc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 117     ("g++"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 118     ("cc"       . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 119     ("CC"       . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 120     ("acc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 121     ("bcc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 122     ("readelf"  . "\\(\\`[^.]*\\|\\.\\([ao]\\|so\\)\\)\\'")
 123     ("objdump"  . "\\(\\`[^.]*\\|\\.\\([ao]\\|so\\)\\)\\'")
 124     ("nm"       . "\\(\\`[^.]*\\|\\.\\([ao]\\|so\\)\\)\\'")
 125     ("gdb"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
 126     ("dbx"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
 127     ("sdb"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
 128     ("adb"      . "\\`\\([^.]*\\|a\\.out\\)\\'"))
 129   "An alist that defines simple argument type correlations.
 130 This is provided for common commands, as a simplistic alternative
 131 to writing a completion function."
 132   :type '(repeat (cons string regexp))
 133   :group 'eshell-cmpl)
 134
 135 (defcustom eshell-cmpl-file-ignore "~\\'"
 136   (documentation-property 'pcomplete-file-ignore
 137                           'variable-documentation)
 138   :type (get 'pcomplete-file-ignore 'custom-type)
 139   :group 'eshell-cmpl)
 140
 141 (defcustom eshell-cmpl-dir-ignore "\\`\\(\\.\\.?\\|CVS\\)/\\'"
 142   (documentation-property 'pcomplete-dir-ignore
 143                           'variable-documentation)
 144   :type (get 'pcomplete-dir-ignore 'custom-type)
 145   :group 'eshell-cmpl)
 146
 147 (defcustom eshell-cmpl-ignore-case (eshell-under-windows-p)
 148   (documentation-property 'pcomplete-ignore-case
 149                           'variable-documentation)
 150   :type (get 'pcomplete-ignore-case 'custom-type)
 151   :group 'eshell-cmpl)
 152
 153 (defcustom eshell-cmpl-autolist nil
 154   (documentation-property 'pcomplete-autolist
 155                           'variable-documentation)
 156   :type (get 'pcomplete-autolist 'custom-type)
 157   :group 'eshell-cmpl)
 158
 159 (defcustom eshell-cmpl-suffix-list (list ?/ ?:)
 160   (documentation-property 'pcomplete-suffix-list
 161                           'variable-documentation)
 162   :type (get 'pcomplete-suffix-list 'custom-type)
 163   :group 'pcomplete)
 164
 165 (defcustom eshell-cmpl-recexact nil
 166   (documentation-property 'pcomplete-recexact
 167                           'variable-documentation)
 168   :type (get 'pcomplete-recexact 'custom-type)
 169   :group 'eshell-cmpl)
 170
 171 (defcustom eshell-cmpl-man-function 'man
 172   (documentation-property 'pcomplete-man-function
 173                           'variable-documentation)
 174   :type (get 'pcomplete-man-function 'custom-type)
 175   :group 'eshell-cmpl)
 176
 177 (defcustom eshell-cmpl-compare-entry-function 'file-newer-than-file-p
 178   (documentation-property 'pcomplete-compare-entry-function
 179                           'variable-documentation)
 180   :type (get 'pcomplete-compare-entry-function 'custom-type)
 181   :group 'eshell-cmpl)
 182
 183 (defcustom eshell-cmpl-expand-before-complete nil
 184   (documentation-property 'pcomplete-expand-before-complete
 185                           'variable-documentation)
 186   :type (get 'pcomplete-expand-before-complete 'custom-type)
 187   :group 'eshell-cmpl)
 188
 189 (defcustom eshell-cmpl-cycle-completions t
 190   (documentation-property 'pcomplete-cycle-completions
 191                           'variable-documentation)
 192   :type (get 'pcomplete-cycle-completions 'custom-type)
 193   :group 'eshell-cmpl)
 194
 195 (defcustom eshell-cmpl-cycle-cutoff-length 5
 196   (documentation-property 'pcomplete-cycle-cutoff-length
 197                           'variable-documentation)
 198   :type (get 'pcomplete-cycle-cutoff-length 'custom-type)
 199   :group 'eshell-cmpl)
 200
 201 (defcustom eshell-cmpl-restore-window-delay 1
 202   (documentation-property 'pcomplete-restore-window-delay
 203                           'variable-documentation)
 204   :type (get 'pcomplete-restore-window-delay 'custom-type)
 205   :group 'eshell-cmpl)
 206
 207 (defcustom eshell-command-completion-function
 208   (function
 209    (lambda ()
 210      (pcomplete-here (eshell-complete-commands-list))))
 211   (documentation-property 'pcomplete-command-completion-function
 212                           'variable-documentation)
 213   :type (get 'pcomplete-command-completion-function 'custom-type)
 214   :group 'eshell-cmpl)
 215
 216 (defcustom eshell-cmpl-command-name-function
 217   'eshell-completion-command-name
 218   (documentation-property 'pcomplete-command-name-function
 219                           'variable-documentation)
 220   :type (get 'pcomplete-command-name-function 'custom-type)
 221   :group 'eshell-cmpl)
 222
 223 (defcustom eshell-default-completion-function
 224   (function
 225    (lambda ()
 226      (while (pcomplete-here
 227              (pcomplete-dirs-or-entries
 228               (cdr (assoc (funcall eshell-cmpl-command-name-function)
 229                           eshell-command-completions-alist)))))))
 230   (documentation-property 'pcomplete-default-completion-function
 231                           'variable-documentation)
 232   :type (get 'pcomplete-default-completion-function 'custom-type)
 233   :group 'eshell-cmpl)
 234
 235 (defcustom eshell-cmpl-use-paring t
 236   (documentation-property 'pcomplete-use-paring 'variable-documentation)
 237   :type (get 'pcomplete-use-paring 'custom-type)
 238   :group 'eshell-cmpl)
 239
 240 ;;; Functions:
 241
 242 (defun eshell-cmpl-initialize ()
 243   "Initialize the completions module."
 244   (unless (fboundp 'pcomplete)
 245     (load "pcmpl-auto" t t))
 246   (set (make-local-variable 'pcomplete-command-completion-function)
 247        eshell-command-completion-function)
 248   (set (make-local-variable 'pcomplete-command-name-function)
 249        eshell-cmpl-command-name-function)
 250   (set (make-local-variable 'pcomplete-default-completion-function)
 251        eshell-default-completion-function)
 252   (set (make-local-variable 'pcomplete-parse-arguments-function)
 253        'eshell-complete-parse-arguments)
 254   (set (make-local-variable 'pcomplete-file-ignore)
 255        eshell-cmpl-file-ignore)
 256   (set (make-local-variable 'pcomplete-dir-ignore)
 257        eshell-cmpl-dir-ignore)
 258   (set (make-local-variable 'pcomplete-ignore-case)
 259        eshell-cmpl-ignore-case)
 260   (set (make-local-variable 'pcomplete-autolist)
 261        eshell-cmpl-autolist)
 262   (set (make-local-variable 'pcomplete-suffix-list)
 263        eshell-cmpl-suffix-list)
 264   (set (make-local-variable 'pcomplete-recexact)
 265        eshell-cmpl-recexact)
 266   (set (make-local-variable 'pcomplete-man-function)
 267        eshell-cmpl-man-function)
 268   (set (make-local-variable 'pcomplete-compare-entry-function)
 269        eshell-cmpl-compare-entry-function)
 270   (set (make-local-variable 'pcomplete-expand-before-complete)
 271        eshell-cmpl-expand-before-complete)
 272   (set (make-local-variable 'pcomplete-cycle-completions)
 273        eshell-cmpl-cycle-completions)
 274   (set (make-local-variable 'pcomplete-cycle-cutoff-length)
 275        eshell-cmpl-cycle-cutoff-length)
 276   (set (make-local-variable 'pcomplete-restore-window-delay)
 277        eshell-cmpl-restore-window-delay)
 278   (set (make-local-variable 'pcomplete-use-paring)
 279        eshell-cmpl-use-paring)
 280   ;; `pcomplete-arg-quote-list' should only be set after all the
 281   ;; load-hooks for any other extension modules have been run, which
 282   ;; is true at the time `eshell-mode-hook' is run
 283   (add-hook 'eshell-mode-hook
 284             (function
 285              (lambda ()
 286                (set (make-local-variable 'pcomplete-arg-quote-list)
 287                     eshell-special-chars-outside-quoting))) nil t)
 288   (add-hook 'pcomplete-quote-arg-hook 'eshell-quote-backslash nil t)
 289   (define-key eshell-mode-map [(meta tab)] 'lisp-complete-symbol)
 290   (define-key eshell-mode-map [(meta control ?i)] 'lisp-complete-symbol)
 291   (define-key eshell-command-map [(meta ?h)] 'eshell-completion-help)
 292   (define-key eshell-command-map [tab] 'pcomplete-expand-and-complete)
 293   (define-key eshell-command-map [(control ?i)]
 294     'pcomplete-expand-and-complete)
 295   (define-key eshell-command-map [space] 'pcomplete-expand)
 296   (define-key eshell-command-map [? ] 'pcomplete-expand)
 297   (define-key eshell-mode-map [tab] 'pcomplete)
 298   (define-key eshell-mode-map [(control ?i)] 'pcomplete)
 299   ;; jww (1999-10-19): Will this work on anything but X?
 300   (if (featurep 'xemacs)
 301       (define-key eshell-mode-map [iso-left-tab] 'pcomplete-reverse)
 302     (define-key eshell-mode-map [backtab] 'pcomplete-reverse))
 303   (define-key eshell-mode-map [(meta ??)] 'pcomplete-list))
 304
 305 (defun eshell-completion-command-name ()
 306   "Return the command name, possibly sans globbing."
 307   (let ((cmd (file-name-nondirectory (pcomplete-arg 'first))))
 308     (setq cmd (if (and (> (length cmd) 0)
 309                        (eq (aref cmd 0) eshell-explicit-command-char))
 310                   (substring cmd 1)
 311                 cmd))
 312     (if (eshell-under-windows-p)
 313         (file-name-sans-extension cmd)
 314       cmd)))
 315
 316 (defun eshell-completion-help ()
 317   (interactive)
 318   (if (= (point) eshell-last-output-end)
 319       (describe-prefix-bindings)
 320     (call-interactively 'pcomplete-help)))
 321
 322 (defun eshell-complete-parse-arguments ()
 323   "Parse the command line arguments for `pcomplete-argument'."
 324   (when (and eshell-no-completion-during-jobs
 325              (eshell-interactive-process))
 326     (insert-and-inherit "\t")
 327     (throw 'pcompleted t))
 328   (let ((end (point-marker))
 329         (begin (save-excursion (eshell-bol) (point)))
 330         (posns (list t))
 331         args delim)
 332     (when (memq this-command '(pcomplete-expand
 333                                pcomplete-expand-and-complete))
 334       (run-hook-with-args 'eshell-expand-input-functions begin end)
 335       (if (= begin end)
 336           (end-of-line))
 337       (setq end (point-marker)))
 338     (if (setq delim
 339               (catch 'eshell-incomplete
 340                 (ignore
 341                  (setq args (eshell-parse-arguments begin end)))))
 342         (cond ((memq (car delim) '(?\{ ?\<))
 343                (setq begin (1+ (cadr delim))
 344                      args (eshell-parse-arguments begin end)))
 345               ((eq (car delim) ?\()
 346                (lisp-complete-symbol)
 347                (throw 'pcompleted t))
 348               (t
 349                (insert-and-inherit "\t")
 350                (throw 'pcompleted t))))
 351     (when (get-text-property (1- end) 'comment)
 352       (insert-and-inherit "\t")
 353       (throw 'pcompleted t))
 354     (let ((pos begin))
 355       (while (< pos end)
 356         (if (get-text-property pos 'arg-begin)
 357             (nconc posns (list pos)))
 358         (setq pos (1+ pos))))
 359     (setq posns (cdr posns))
 360     (assert (= (length args) (length posns)))
 361     (let ((a args)
 362           (i 0)
 363           l final)
 364       (while a
 365         (if (and (consp (car a))
 366                  (eq (caar a) 'eshell-operator))
 367             (setq l i))
 368         (setq a (cdr a) i (1+ i)))
 369       (and l
 370            (setq args (nthcdr (1+ l) args)
 371                  posns (nthcdr (1+ l) posns))))
 372     (assert (= (length args) (length posns)))
 373     (when (and args (eq (char-syntax (char-before end)) ? )
 374                (not (eq (char-before (1- end)) ?\\)))
 375       (nconc args (list ""))
 376       (nconc posns (list (point))))
 377     (cons (mapcar
 378            (function
 379             (lambda (arg)
 380               (let ((val
 381                      (if (listp arg)
 382                          (let ((result
 383                                 (eshell-do-eval
 384                                  (list 'eshell-commands arg) t)))
 385                            (assert (eq (car result) 'quote))
 386                            (cadr result))
 387                        arg)))
 388                 (if (numberp val)
 389                     (setq val (number-to-string val)))
 390                 (or val ""))))
 391            args)
 392           posns)))
 393
 394 (defun eshell-complete-commands-list ()
 395   "Generate list of applicable, visible commands."
 396   (let ((filename (pcomplete-arg)) glob-name)
 397     (if (file-name-directory filename)
 398         (pcomplete-executables)
 399       (if (and (> (length filename) 0)
 400                (eq (aref filename 0) eshell-explicit-command-char))
 401           (setq filename (substring filename 1)
 402                 pcomplete-stub filename
 403                 glob-name t))
 404       (let* ((paths (eshell-parse-colon-path eshell-path-env))
 405              (cwd (file-name-as-directory
 406                    (expand-file-name default-directory)))
 407              (path "") (comps-in-path ())
 408              (file "") (filepath "") (completions ()))
 409         ;; Go thru each path in the search path, finding completions.
 410         (while paths
 411           (setq path (file-name-as-directory
 412                       (expand-file-name (or (car paths) ".")))
 413                 comps-in-path
 414                 (and (file-accessible-directory-p path)
 415                      (file-name-all-completions filename path)))
 416           ;; Go thru each completion found, to see whether it should
 417           ;; be used.
 418           (while comps-in-path
 419             (setq file (car comps-in-path)
 420                   filepath (concat path file))
 421             (if (and (not (member file completions)) ;
 422                      (or (string-equal path cwd)
 423                          (not (file-directory-p filepath)))
 424                      (file-executable-p filepath))
 425                 (setq completions (cons file completions)))
 426             (setq comps-in-path (cdr comps-in-path)))
 427           (setq paths (cdr paths)))
 428         ;; Add aliases which are currently visible, and Lisp functions.
 429         (pcomplete-uniqify-list
 430          (if glob-name
 431              completions
 432            (setq completions
 433                  (append (and (eshell-using-module 'eshell-alias)
 434                               (funcall (symbol-function 'eshell-alias-completions)
 435                                        filename))
 436                          (eshell-winnow-list
 437                           (mapcar
 438                            (function
 439                             (lambda (name)
 440                               (substring name 7)))
 441                            (all-completions (concat "eshell/" filename)
 442                                             obarray 'functionp))
 443                           nil '(eshell-find-alias-function))
 444                          completions))
 445            (append (and (or eshell-show-lisp-completions
 446                             (and eshell-show-lisp-alternatives
 447                                  (null completions)))
 448                         (all-completions filename obarray 'functionp))
 449                    completions)))))))
 450
 451 (provide 'em-cmpl)
 452
 453 ;; Local Variables:
 454 ;; generated-autoload-file: "esh-groups.el"
 455 ;; End:
 456
 457 ;;; em-cmpl.el ends here