lisp/eshell/em-cmpl.el

   1 ;;; em-cmpl.el --- completion using the TAB key
   2
   3 ;; Copyright (C) 1999-2013 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-lib)
  74   (require 'eshell))
  75 (require 'esh-util)
  76
  77 ;;;###autoload
  78 (progn
  79 (defgroup eshell-cmpl nil
  80   "This module provides a programmable completion function bound to
  81 the TAB key, which allows for completing command names, file names,
  82 variable names, arguments, etc."
  83   :tag "Argument completion"
  84   :group 'eshell-module))
  85
  86 ;;; User Variables:
  87
  88 (defcustom eshell-cmpl-load-hook nil
  89   "A list of functions to run when `eshell-cmpl' is loaded."
  90   :version "24.1"                       ; removed eshell-cmpl-initialize
  91   :type 'hook
  92   :group 'eshell-cmpl)
  93
  94 (defcustom eshell-show-lisp-completions nil
  95   "If non-nil, include Lisp functions in the command completion list.
  96 If this variable is nil, Lisp completion can still be done in command
  97 position by using M-TAB instead of TAB."
  98   :type 'boolean
  99   :group 'eshell-cmpl)
 100
 101 (defcustom eshell-show-lisp-alternatives t
 102   "If non-nil, and no other completions found, show Lisp functions.
 103 Setting this variable means nothing if `eshell-show-lisp-completions'
 104 is non-nil."
 105   :type 'boolean
 106   :group 'eshell-cmpl)
 107
 108 (defcustom eshell-no-completion-during-jobs t
 109   "If non-nil, don't allow completion while a process is running."
 110   :type 'boolean
 111   :group 'eshell-cmpl)
 112
 113 (defcustom eshell-command-completions-alist
 114   '(("acroread" . "\\.pdf\\'")
 115     ("xpdf"     . "\\.pdf\\'")
 116     ("ar"       . "\\.[ao]\\'")
 117     ("gcc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 118     ("g++"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 119     ("cc"       . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 120     ("CC"       . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 121     ("acc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 122     ("bcc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 123     ("readelf"  . "\\(\\`[^.]*\\|\\.\\([ao]\\|so\\)\\)\\'")
 124     ("objdump"  . "\\(\\`[^.]*\\|\\.\\([ao]\\|so\\)\\)\\'")
 125     ("nm"       . "\\(\\`[^.]*\\|\\.\\([ao]\\|so\\)\\)\\'")
 126     ("gdb"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
 127     ("dbx"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
 128     ("sdb"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
 129     ("adb"      . "\\`\\([^.]*\\|a\\.out\\)\\'"))
 130   "An alist that defines simple argument type correlations.
 131 This is provided for common commands, as a simplistic alternative
 132 to writing a completion function."
 133   :type '(repeat (cons string regexp))
 134   :group 'eshell-cmpl)
 135
 136 (defcustom eshell-cmpl-file-ignore "~\\'"
 137   (documentation-property 'pcomplete-file-ignore
 138                           'variable-documentation)
 139   :type (get 'pcomplete-file-ignore 'custom-type)
 140   :group 'eshell-cmpl)
 141
 142 (defcustom eshell-cmpl-dir-ignore "\\`\\(\\.\\.?\\|CVS\\)/\\'"
 143   (documentation-property 'pcomplete-dir-ignore
 144                           'variable-documentation)
 145   :type (get 'pcomplete-dir-ignore 'custom-type)
 146   :group 'eshell-cmpl)
 147
 148 (defcustom eshell-cmpl-ignore-case (eshell-under-windows-p)
 149   (documentation-property 'pcomplete-ignore-case
 150                           'variable-documentation)
 151   :type (get 'pcomplete-ignore-case 'custom-type)
 152   :group 'eshell-cmpl)
 153
 154 (defcustom eshell-cmpl-autolist nil
 155   (documentation-property 'pcomplete-autolist
 156                           'variable-documentation)
 157   :type (get 'pcomplete-autolist 'custom-type)
 158   :group 'eshell-cmpl)
 159
 160 (defcustom eshell-cmpl-suffix-list (list ?/ ?:)
 161   (documentation-property 'pcomplete-suffix-list
 162                           'variable-documentation)
 163   :type (get 'pcomplete-suffix-list 'custom-type)
 164   :group 'pcomplete)
 165
 166 (defcustom eshell-cmpl-recexact nil
 167   (documentation-property 'pcomplete-recexact
 168                           'variable-documentation)
 169   :type (get 'pcomplete-recexact 'custom-type)
 170   :group 'eshell-cmpl)
 171
 172 (defcustom eshell-cmpl-man-function 'man
 173   (documentation-property 'pcomplete-man-function
 174                           'variable-documentation)
 175   :type (get 'pcomplete-man-function 'custom-type)
 176   :group 'eshell-cmpl)
 177
 178 (defcustom eshell-cmpl-compare-entry-function 'file-newer-than-file-p
 179   (documentation-property 'pcomplete-compare-entry-function
 180                           'variable-documentation)
 181   :type (get 'pcomplete-compare-entry-function 'custom-type)
 182   :group 'eshell-cmpl)
 183
 184 (defcustom eshell-cmpl-expand-before-complete nil
 185   (documentation-property 'pcomplete-expand-before-complete
 186                           'variable-documentation)
 187   :type (get 'pcomplete-expand-before-complete 'custom-type)
 188   :group 'eshell-cmpl)
 189
 190 (defcustom eshell-cmpl-cycle-completions t
 191   (documentation-property 'pcomplete-cycle-completions
 192                           'variable-documentation)
 193   :type (get 'pcomplete-cycle-completions 'custom-type)
 194   :group 'eshell-cmpl)
 195
 196 (defcustom eshell-cmpl-cycle-cutoff-length 5
 197   (documentation-property 'pcomplete-cycle-cutoff-length
 198                           'variable-documentation)
 199   :type (get 'pcomplete-cycle-cutoff-length 'custom-type)
 200   :group 'eshell-cmpl)
 201
 202 (defcustom eshell-cmpl-restore-window-delay 1
 203   (documentation-property 'pcomplete-restore-window-delay
 204                           'variable-documentation)
 205   :type (get 'pcomplete-restore-window-delay 'custom-type)
 206   :group 'eshell-cmpl)
 207
 208 (defcustom eshell-command-completion-function
 209   (function
 210    (lambda ()
 211      (pcomplete-here (eshell-complete-commands-list))))
 212   (documentation-property 'pcomplete-command-completion-function
 213                           'variable-documentation)
 214   :type (get 'pcomplete-command-completion-function 'custom-type)
 215   :group 'eshell-cmpl)
 216
 217 (defcustom eshell-cmpl-command-name-function
 218   'eshell-completion-command-name
 219   (documentation-property 'pcomplete-command-name-function
 220                           'variable-documentation)
 221   :type (get 'pcomplete-command-name-function 'custom-type)
 222   :group 'eshell-cmpl)
 223
 224 (defcustom eshell-default-completion-function
 225   (function
 226    (lambda ()
 227      (while (pcomplete-here
 228              (pcomplete-dirs-or-entries
 229               (cdr (assoc (funcall eshell-cmpl-command-name-function)
 230                           eshell-command-completions-alist)))))))
 231   (documentation-property 'pcomplete-default-completion-function
 232                           'variable-documentation)
 233   :type (get 'pcomplete-default-completion-function 'custom-type)
 234   :group 'eshell-cmpl)
 235
 236 (defcustom eshell-cmpl-use-paring t
 237   (documentation-property 'pcomplete-use-paring 'variable-documentation)
 238   :type (get 'pcomplete-use-paring 'custom-type)
 239   :group 'eshell-cmpl)
 240
 241 ;;; Functions:
 242
 243 (defun eshell-cmpl-initialize ()
 244   "Initialize the completions module."
 245   (unless (fboundp 'pcomplete)
 246     (load "pcmpl-auto" t t))
 247   (set (make-local-variable 'pcomplete-command-completion-function)
 248        eshell-command-completion-function)
 249   (set (make-local-variable 'pcomplete-command-name-function)
 250        eshell-cmpl-command-name-function)
 251   (set (make-local-variable 'pcomplete-default-completion-function)
 252        eshell-default-completion-function)
 253   (set (make-local-variable 'pcomplete-parse-arguments-function)
 254        'eshell-complete-parse-arguments)
 255   (set (make-local-variable 'pcomplete-file-ignore)
 256        eshell-cmpl-file-ignore)
 257   (set (make-local-variable 'pcomplete-dir-ignore)
 258        eshell-cmpl-dir-ignore)
 259   (set (make-local-variable 'pcomplete-ignore-case)
 260        eshell-cmpl-ignore-case)
 261   (set (make-local-variable 'pcomplete-autolist)
 262        eshell-cmpl-autolist)
 263   (set (make-local-variable 'pcomplete-suffix-list)
 264        eshell-cmpl-suffix-list)
 265   (set (make-local-variable 'pcomplete-recexact)
 266        eshell-cmpl-recexact)
 267   (set (make-local-variable 'pcomplete-man-function)
 268        eshell-cmpl-man-function)
 269   (set (make-local-variable 'pcomplete-compare-entry-function)
 270        eshell-cmpl-compare-entry-function)
 271   (set (make-local-variable 'pcomplete-expand-before-complete)
 272        eshell-cmpl-expand-before-complete)
 273   (set (make-local-variable 'pcomplete-cycle-completions)
 274        eshell-cmpl-cycle-completions)
 275   (set (make-local-variable 'pcomplete-cycle-cutoff-length)
 276        eshell-cmpl-cycle-cutoff-length)
 277   (set (make-local-variable 'pcomplete-restore-window-delay)
 278        eshell-cmpl-restore-window-delay)
 279   (set (make-local-variable 'pcomplete-use-paring)
 280        eshell-cmpl-use-paring)
 281   ;; `pcomplete-arg-quote-list' should only be set after all the
 282   ;; load-hooks for any other extension modules have been run, which
 283   ;; is true at the time `eshell-mode-hook' is run
 284   (add-hook 'eshell-mode-hook
 285             (function
 286              (lambda ()
 287                (set (make-local-variable 'pcomplete-arg-quote-list)
 288                     eshell-special-chars-outside-quoting))) nil t)
 289   (add-hook 'pcomplete-quote-arg-hook 'eshell-quote-backslash nil t)
 290   (define-key eshell-mode-map [(meta tab)] 'lisp-complete-symbol)
 291   (define-key eshell-mode-map [(meta control ?i)] 'lisp-complete-symbol)
 292   (define-key eshell-command-map [(meta ?h)] 'eshell-completion-help)
 293   (define-key eshell-command-map [tab] 'pcomplete-expand-and-complete)
 294   (define-key eshell-command-map [(control ?i)]
 295     'pcomplete-expand-and-complete)
 296   (define-key eshell-command-map [space] 'pcomplete-expand)
 297   (define-key eshell-command-map [? ] 'pcomplete-expand)
 298   (define-key eshell-mode-map [tab] 'eshell-pcomplete)
 299   (define-key eshell-mode-map [(control ?i)] 'eshell-pcomplete)
 300   (add-hook 'completion-at-point-functions
 301             #'pcomplete-completions-at-point nil t)
 302   ;; jww (1999-10-19): Will this work on anything but X?
 303   (if (featurep 'xemacs)
 304       (define-key eshell-mode-map [iso-left-tab] 'pcomplete-reverse)
 305     (define-key eshell-mode-map [backtab] 'pcomplete-reverse))
 306   (define-key eshell-mode-map [(meta ??)] 'pcomplete-list))
 307
 308 (defun eshell-completion-command-name ()
 309   "Return the command name, possibly sans globbing."
 310   (let ((cmd (file-name-nondirectory (pcomplete-arg 'first))))
 311     (setq cmd (if (and (> (length cmd) 0)
 312                        (eq (aref cmd 0) eshell-explicit-command-char))
 313                   (substring cmd 1)
 314                 cmd))
 315     (if (eshell-under-windows-p)
 316         (file-name-sans-extension cmd)
 317       cmd)))
 318
 319 (defun eshell-completion-help ()
 320   (interactive)
 321   (if (= (point) eshell-last-output-end)
 322       (describe-prefix-bindings)
 323     (call-interactively 'pcomplete-help)))
 324
 325 (defun eshell-complete-parse-arguments ()
 326   "Parse the command line arguments for `pcomplete-argument'."
 327   (when (and eshell-no-completion-during-jobs
 328              (eshell-interactive-process))
 329     (insert-and-inherit "\t")
 330     (throw 'pcompleted t))
 331   (let ((end (point-marker))
 332         (begin (save-excursion (eshell-bol) (point)))
 333         (posns (list t))
 334         args delim)
 335     (when (memq this-command '(pcomplete-expand
 336                                pcomplete-expand-and-complete))
 337       (run-hook-with-args 'eshell-expand-input-functions begin end)
 338       (if (= begin end)
 339           (end-of-line))
 340       (setq end (point-marker)))
 341     (if (setq delim
 342               (catch 'eshell-incomplete
 343                 (ignore
 344                  (setq args (eshell-parse-arguments begin end)))))
 345         (cond ((memq (car delim) '(?\{ ?\<))
 346                (setq begin (1+ (cadr delim))
 347                      args (eshell-parse-arguments begin end)))
 348               ((eq (car delim) ?\()
 349                (lisp-complete-symbol)
 350                (throw 'pcompleted t))
 351               (t
 352                (insert-and-inherit "\t")
 353                (throw 'pcompleted t))))
 354     (when (get-text-property (1- end) 'comment)
 355       (insert-and-inherit "\t")
 356       (throw 'pcompleted t))
 357     (let ((pos begin))
 358       (while (< pos end)
 359         (if (get-text-property pos 'arg-begin)
 360             (nconc posns (list pos)))
 361         (setq pos (1+ pos))))
 362     (setq posns (cdr posns))
 363     (cl-assert (= (length args) (length posns)))
 364     (let ((a args)
 365           (i 0)
 366           l final)
 367       (while a
 368         (if (and (consp (car a))
 369                  (eq (caar a) 'eshell-operator))
 370             (setq l i))
 371         (setq a (cdr a) i (1+ i)))
 372       (and l
 373            (setq args (nthcdr (1+ l) args)
 374                  posns (nthcdr (1+ l) posns))))
 375     (cl-assert (= (length args) (length posns)))
 376     (when (and args (eq (char-syntax (char-before end)) ? )
 377                (not (eq (char-before (1- end)) ?\\)))
 378       (nconc args (list ""))
 379       (nconc posns (list (point))))
 380     (cons (mapcar
 381            (function
 382             (lambda (arg)
 383               (let ((val
 384                      (if (listp arg)
 385                          (let ((result
 386                                 (eshell-do-eval
 387                                  (list 'eshell-commands arg) t)))
 388                            (cl-assert (eq (car result) 'quote))
 389                            (cadr result))
 390                        arg)))
 391                 (if (numberp val)
 392                     (setq val (number-to-string val)))
 393                 (or val ""))))
 394            args)
 395           posns)))
 396
 397 (defun eshell-complete-commands-list ()
 398   "Generate list of applicable, visible commands."
 399   (let ((filename (pcomplete-arg)) glob-name)
 400     (if (file-name-directory filename)
 401         (pcomplete-executables)
 402       (if (and (> (length filename) 0)
 403                (eq (aref filename 0) eshell-explicit-command-char))
 404           (setq filename (substring filename 1)
 405                 pcomplete-stub filename
 406                 glob-name t))
 407       (let* ((paths (eshell-parse-colon-path eshell-path-env))
 408              (cwd (file-name-as-directory
 409                    (expand-file-name default-directory)))
 410              (path "") (comps-in-path ())
 411              (file "") (filepath "") (completions ()))
 412         ;; Go thru each path in the search path, finding completions.
 413         (while paths
 414           (setq path (file-name-as-directory
 415                       (expand-file-name (or (car paths) ".")))
 416                 comps-in-path
 417                 (and (file-accessible-directory-p path)
 418                      (file-name-all-completions filename path)))
 419           ;; Go thru each completion found, to see whether it should
 420           ;; be used.
 421           (while comps-in-path
 422             (setq file (car comps-in-path)
 423                   filepath (concat path file))
 424             (if (and (not (member file completions)) ;
 425                      (or (string-equal path cwd)
 426                          (not (file-directory-p filepath)))
 427                      (file-executable-p filepath))
 428                 (setq completions (cons file completions)))
 429             (setq comps-in-path (cdr comps-in-path)))
 430           (setq paths (cdr paths)))
 431         ;; Add aliases which are currently visible, and Lisp functions.
 432         (pcomplete-uniqify-list
 433          (if glob-name
 434              completions
 435            (setq completions
 436                  (append (and (eshell-using-module 'eshell-alias)
 437                               (funcall (symbol-function 'eshell-alias-completions)
 438                                        filename))
 439                          (eshell-winnow-list
 440                           (mapcar
 441                            (function
 442                             (lambda (name)
 443                               (substring name 7)))
 444                            (all-completions (concat "eshell/" filename)
 445                                             obarray 'functionp))
 446                           nil '(eshell-find-alias-function))
 447                          completions))
 448            (append (and (or eshell-show-lisp-completions
 449                             (and eshell-show-lisp-alternatives
 450                                  (null completions)))
 451                         (all-completions filename obarray 'functionp))
 452                    completions)))))))
 453
 454 (defun eshell-pcomplete (&optional interactively)
 455   "Eshell wrapper for `pcomplete'."
 456   (interactive "p")
 457   ;; Pretend to be pcomplete so that cycling works (bug#13293).
 458   (setq this-command 'pcomplete)
 459   (condition-case nil
 460       (if interactively
 461           (call-interactively 'pcomplete)
 462         (pcomplete))
 463     (text-read-only (completion-at-point)))) ; Workaround for bug#12838.
 464
 465 (provide 'em-cmpl)
 466
 467 ;; Local Variables:
 468 ;; generated-autoload-file: "esh-groups.el"
 469 ;; End:
 470
 471 ;;; em-cmpl.el ends here