lisp/eshell/em-cmpl.el

   1 ;;; em-cmpl.el --- completion using the TAB key  -*- lexical-binding:t -*-
   2
   3 ;; Copyright (C) 1999-2016 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 M-h>.
  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 (require 'pcomplete)
  72
  73 (require 'esh-mode)
  74 (require 'esh-util)
  75
  76 (eval-when-compile
  77   (require 'cl-lib)
  78   (require 'eshell))
  79
  80 ;;;###autoload
  81 (progn
  82 (defgroup eshell-cmpl nil
  83   "This module provides a programmable completion function bound to
  84 the TAB key, which allows for completing command names, file names,
  85 variable names, arguments, etc."
  86   :tag "Argument completion"
  87   :group 'eshell-module))
  88
  89 ;;; User Variables:
  90
  91 (defcustom eshell-cmpl-load-hook nil
  92   "A list of functions to run when `eshell-cmpl' is loaded."
  93   :version "24.1"                       ; removed eshell-cmpl-initialize
  94   :type 'hook
  95   :group 'eshell-cmpl)
  96
  97 (defcustom eshell-show-lisp-completions nil
  98   "If non-nil, include Lisp functions in the command completion list.
  99 If this variable is nil, Lisp completion can still be done in command
 100 position by using M-TAB instead of TAB."
 101   :type 'boolean
 102   :group 'eshell-cmpl)
 103
 104 (defcustom eshell-show-lisp-alternatives t
 105   "If non-nil, and no other completions found, show Lisp functions.
 106 Setting this variable means nothing if `eshell-show-lisp-completions'
 107 is non-nil."
 108   :type 'boolean
 109   :group 'eshell-cmpl)
 110
 111 (defcustom eshell-no-completion-during-jobs t
 112   "If non-nil, don't allow completion while a process is running."
 113   :type 'boolean
 114   :group 'eshell-cmpl)
 115
 116 (defcustom eshell-command-completions-alist
 117   '(("acroread" . "\\.pdf\\'")
 118     ("xpdf"     . "\\.pdf\\'")
 119     ("ar"       . "\\.[ao]\\'")
 120     ("gcc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 121     ("g++"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 122     ("cc"       . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 123     ("CC"       . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 124     ("acc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 125     ("bcc"      . "\\.[Cc]\\([Cc]\\|[Pp][Pp]\\)?\\'")
 126     ("readelf"  . "\\(\\`[^.]*\\|\\.\\([ao]\\|so\\)\\)\\'")
 127     ("objdump"  . "\\(\\`[^.]*\\|\\.\\([ao]\\|so\\)\\)\\'")
 128     ("nm"       . "\\(\\`[^.]*\\|\\.\\([ao]\\|so\\)\\)\\'")
 129     ("gdb"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
 130     ("dbx"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
 131     ("sdb"      . "\\`\\([^.]*\\|a\\.out\\)\\'")
 132     ("adb"      . "\\`\\([^.]*\\|a\\.out\\)\\'"))
 133   "An alist that defines simple argument type correlations.
 134 This is provided for common commands, as a simplistic alternative
 135 to writing a completion function."
 136   :type '(repeat (cons string regexp))
 137   :group 'eshell-cmpl)
 138
 139 (defcustom eshell-cmpl-file-ignore "~\\'"
 140   (documentation-property 'pcomplete-file-ignore
 141                           'variable-documentation)
 142   :type (get 'pcomplete-file-ignore 'custom-type)
 143   :group 'eshell-cmpl)
 144
 145 (defcustom eshell-cmpl-dir-ignore "\\`\\(\\.\\.?\\|CVS\\)/\\'"
 146   (documentation-property 'pcomplete-dir-ignore
 147                           'variable-documentation)
 148   :type (get 'pcomplete-dir-ignore 'custom-type)
 149   :group 'eshell-cmpl)
 150
 151 (defcustom eshell-cmpl-ignore-case (eshell-under-windows-p)
 152   (documentation-property 'pcomplete-ignore-case
 153                           'variable-documentation)
 154   :type (get 'pcomplete-ignore-case 'custom-type)
 155   :group 'eshell-cmpl)
 156
 157 (defcustom eshell-cmpl-autolist nil
 158   (documentation-property 'pcomplete-autolist
 159                           'variable-documentation)
 160   :type (get 'pcomplete-autolist 'custom-type)
 161   :group 'eshell-cmpl)
 162
 163 (defcustom eshell-cmpl-suffix-list (list ?/ ?:)
 164   (documentation-property 'pcomplete-suffix-list
 165                           'variable-documentation)
 166   :type (get 'pcomplete-suffix-list 'custom-type)
 167   :group 'pcomplete)
 168
 169 (defcustom eshell-cmpl-recexact nil
 170   (documentation-property 'pcomplete-recexact
 171                           'variable-documentation)
 172   :type (get 'pcomplete-recexact 'custom-type)
 173   :group 'eshell-cmpl)
 174
 175 (defcustom eshell-cmpl-man-function 'man
 176   (documentation-property 'pcomplete-man-function
 177                           'variable-documentation)
 178   :type (get 'pcomplete-man-function 'custom-type)
 179   :group 'eshell-cmpl)
 180
 181 (defcustom eshell-cmpl-compare-entry-function 'file-newer-than-file-p
 182   (documentation-property 'pcomplete-compare-entry-function
 183                           'variable-documentation)
 184   :type (get 'pcomplete-compare-entry-function 'custom-type)
 185   :group 'eshell-cmpl)
 186
 187 (defcustom eshell-cmpl-expand-before-complete nil
 188   (documentation-property 'pcomplete-expand-before-complete
 189                           'variable-documentation)
 190   :type (get 'pcomplete-expand-before-complete 'custom-type)
 191   :group 'eshell-cmpl)
 192
 193 (defcustom eshell-cmpl-cycle-completions t
 194   (documentation-property 'pcomplete-cycle-completions
 195                           'variable-documentation)
 196   :type (get 'pcomplete-cycle-completions 'custom-type)
 197   :group 'eshell-cmpl)
 198
 199 (defcustom eshell-cmpl-cycle-cutoff-length 5
 200   (documentation-property 'pcomplete-cycle-cutoff-length
 201                           'variable-documentation)
 202   :type (get 'pcomplete-cycle-cutoff-length 'custom-type)
 203   :group 'eshell-cmpl)
 204
 205 (defcustom eshell-cmpl-restore-window-delay 1
 206   (documentation-property 'pcomplete-restore-window-delay
 207                           'variable-documentation)
 208   :type (get 'pcomplete-restore-window-delay 'custom-type)
 209   :group 'eshell-cmpl)
 210
 211 (defcustom eshell-command-completion-function
 212   (function
 213    (lambda ()
 214      (pcomplete-here (eshell-complete-commands-list))))
 215   (documentation-property 'pcomplete-command-completion-function
 216                           'variable-documentation)
 217   :type (get 'pcomplete-command-completion-function 'custom-type)
 218   :group 'eshell-cmpl)
 219
 220 (defcustom eshell-cmpl-command-name-function
 221   'eshell-completion-command-name
 222   (documentation-property 'pcomplete-command-name-function
 223                           'variable-documentation)
 224   :type (get 'pcomplete-command-name-function 'custom-type)
 225   :group 'eshell-cmpl)
 226
 227 (defcustom eshell-default-completion-function
 228   (function
 229    (lambda ()
 230      (while (pcomplete-here
 231              (pcomplete-dirs-or-entries
 232               (cdr (assoc (funcall eshell-cmpl-command-name-function)
 233                           eshell-command-completions-alist)))))))
 234   (documentation-property 'pcomplete-default-completion-function
 235                           'variable-documentation)
 236   :type (get 'pcomplete-default-completion-function 'custom-type)
 237   :group 'eshell-cmpl)
 238
 239 (defcustom eshell-cmpl-use-paring t
 240   (documentation-property 'pcomplete-use-paring 'variable-documentation)
 241   :type (get 'pcomplete-use-paring 'custom-type)
 242   :group 'eshell-cmpl)
 243
 244 ;;; Functions:
 245
 246 (defun eshell-complete-lisp-symbol ()
 247   "Try to complete the text around point as a Lisp symbol."
 248   (interactive)
 249   (let ((completion-at-point-functions '(lisp-completion-at-point)))
 250     (completion-at-point)))
 251
 252 (defun eshell-cmpl-initialize ()
 253   "Initialize the completions module."
 254   (set (make-local-variable 'pcomplete-command-completion-function)
 255        eshell-command-completion-function)
 256   (set (make-local-variable 'pcomplete-command-name-function)
 257        eshell-cmpl-command-name-function)
 258   (set (make-local-variable 'pcomplete-default-completion-function)
 259        eshell-default-completion-function)
 260   (set (make-local-variable 'pcomplete-parse-arguments-function)
 261        'eshell-complete-parse-arguments)
 262   (set (make-local-variable 'pcomplete-file-ignore)
 263        eshell-cmpl-file-ignore)
 264   (set (make-local-variable 'pcomplete-dir-ignore)
 265        eshell-cmpl-dir-ignore)
 266   (set (make-local-variable 'pcomplete-ignore-case)
 267        eshell-cmpl-ignore-case)
 268   (set (make-local-variable 'pcomplete-autolist)
 269        eshell-cmpl-autolist)
 270   (set (make-local-variable 'pcomplete-suffix-list)
 271        eshell-cmpl-suffix-list)
 272   (set (make-local-variable 'pcomplete-recexact)
 273        eshell-cmpl-recexact)
 274   (set (make-local-variable 'pcomplete-man-function)
 275        eshell-cmpl-man-function)
 276   (set (make-local-variable 'pcomplete-compare-entry-function)
 277        eshell-cmpl-compare-entry-function)
 278   (set (make-local-variable 'pcomplete-expand-before-complete)
 279        eshell-cmpl-expand-before-complete)
 280   (set (make-local-variable 'pcomplete-cycle-completions)
 281        eshell-cmpl-cycle-completions)
 282   (set (make-local-variable 'pcomplete-cycle-cutoff-length)
 283        eshell-cmpl-cycle-cutoff-length)
 284   (set (make-local-variable 'pcomplete-restore-window-delay)
 285        eshell-cmpl-restore-window-delay)
 286   (set (make-local-variable 'pcomplete-use-paring)
 287        eshell-cmpl-use-paring)
 288   ;; `comint-file-name-quote-list' should only be set after all the
 289   ;; load-hooks for any other extension modules have been run, which
 290   ;; is true at the time `eshell-mode-hook' is run
 291   (add-hook 'eshell-mode-hook
 292             (function
 293              (lambda ()
 294                (set (make-local-variable 'comint-file-name-quote-list)
 295                     eshell-special-chars-outside-quoting))) nil t)
 296   (add-hook 'pcomplete-quote-arg-hook 'eshell-quote-backslash nil t)
 297   (define-key eshell-mode-map [(meta tab)] 'eshell-complete-lisp-symbol)
 298   (define-key eshell-mode-map [(meta control ?i)] 'eshell-complete-lisp-symbol)
 299   (define-key eshell-command-map [(meta ?h)] 'eshell-completion-help)
 300   (define-key eshell-command-map [tab] 'pcomplete-expand-and-complete)
 301   (define-key eshell-command-map [(control ?i)]
 302     'pcomplete-expand-and-complete)
 303   (define-key eshell-command-map [space] 'pcomplete-expand)
 304   (define-key eshell-command-map [? ] 'pcomplete-expand)
 305   (define-key eshell-mode-map [tab] 'eshell-pcomplete)
 306   (define-key eshell-mode-map [(control ?i)] 'eshell-pcomplete)
 307   (add-hook 'completion-at-point-functions
 308             #'pcomplete-completions-at-point nil t)
 309   ;; jww (1999-10-19): Will this work on anything but X?
 310   (if (featurep 'xemacs)
 311       (define-key eshell-mode-map [iso-left-tab] 'pcomplete-reverse)
 312     (define-key eshell-mode-map [backtab] 'pcomplete-reverse))
 313   (define-key eshell-mode-map [(meta ??)] 'pcomplete-list))
 314
 315 (defun eshell-completion-command-name ()
 316   "Return the command name, possibly sans globbing."
 317   (let ((cmd (file-name-nondirectory (pcomplete-arg 'first))))
 318     (setq cmd (if (and (> (length cmd) 0)
 319                        (eq (aref cmd 0) eshell-explicit-command-char))
 320                   (substring cmd 1)
 321                 cmd))
 322     (if (eshell-under-windows-p)
 323         (file-name-sans-extension cmd)
 324       cmd)))
 325
 326 (defun eshell-completion-help ()
 327   (interactive)
 328   (if (= (point) eshell-last-output-end)
 329       (describe-prefix-bindings)
 330     (call-interactively 'pcomplete-help)))
 331
 332 (defun eshell-complete-parse-arguments ()
 333   "Parse the command line arguments for `pcomplete-argument'."
 334   (when (and eshell-no-completion-during-jobs
 335              (eshell-interactive-process))
 336     (insert-and-inherit "\t")
 337     (throw 'pcompleted t))
 338   (let ((end (point-marker))
 339         (begin (save-excursion (eshell-bol) (point)))
 340         (posns (list t))
 341         args delim)
 342     (when (memq this-command '(pcomplete-expand
 343                                pcomplete-expand-and-complete))
 344       (run-hook-with-args 'eshell-expand-input-functions begin end)
 345       (if (= begin end)
 346           (end-of-line))
 347       (setq end (point-marker)))
 348     (if (setq delim
 349               (catch 'eshell-incomplete
 350                 (ignore
 351                  (setq args (eshell-parse-arguments begin end)))))
 352         (cond ((memq (car delim) '(?\{ ?\<))
 353                (setq begin (1+ (cadr delim))
 354                      args (eshell-parse-arguments begin end)))
 355               ((eq (car delim) ?\()
 356                (eshell-complete-lisp-symbol)
 357                (throw 'pcompleted t))
 358               (t
 359                (insert-and-inherit "\t")
 360                (throw 'pcompleted t))))
 361     (when (get-text-property (1- end) 'comment)
 362       (insert-and-inherit "\t")
 363       (throw 'pcompleted t))
 364     (let ((pos begin))
 365       (while (< pos end)
 366         (if (get-text-property pos 'arg-begin)
 367             (nconc posns (list pos)))
 368         (setq pos (1+ pos))))
 369     (setq posns (cdr posns))
 370     (cl-assert (= (length args) (length posns)))
 371     (let ((a args)
 372           (i 0)
 373           l)
 374       (while a
 375         (if (and (consp (car a))
 376                  (eq (caar a) 'eshell-operator))
 377             (setq l i))
 378         (setq a (cdr a) i (1+ i)))
 379       (and l
 380            (setq args (nthcdr (1+ l) args)
 381                  posns (nthcdr (1+ l) posns))))
 382     (cl-assert (= (length args) (length posns)))
 383     (when (and args (eq (char-syntax (char-before end)) ? )
 384                (not (eq (char-before (1- end)) ?\\)))
 385       (nconc args (list ""))
 386       (nconc posns (list (point))))
 387     (cons (mapcar
 388            (function
 389             (lambda (arg)
 390               (let ((val
 391                      (if (listp arg)
 392                          (let ((result
 393                                 (eshell-do-eval
 394                                  (list 'eshell-commands arg) t)))
 395                            (cl-assert (eq (car result) 'quote))
 396                            (cadr result))
 397                        arg)))
 398                 (if (numberp val)
 399                     (setq val (number-to-string val)))
 400                 (or val ""))))
 401            args)
 402           posns)))
 403
 404 (defun eshell-complete-commands-list ()
 405   "Generate list of applicable, visible commands."
 406   (let ((filename (pcomplete-arg)) glob-name)
 407     (if (file-name-directory filename)
 408         (if eshell-force-execution
 409             (pcomplete-dirs-or-entries nil 'file-readable-p)
 410           (pcomplete-executables))
 411       (if (and (> (length filename) 0)
 412                (eq (aref filename 0) eshell-explicit-command-char))
 413           (setq filename (substring filename 1)
 414                 pcomplete-stub filename
 415                 glob-name t))
 416       (let* ((paths (eshell-parse-colon-path eshell-path-env))
 417              (cwd (file-name-as-directory
 418                    (expand-file-name default-directory)))
 419              (path "") (comps-in-path ())
 420              (file "") (filepath "") (completions ()))
 421         (if (eshell-under-windows-p)
 422             (push "." paths))
 423         ;; Go thru each path in the search path, finding completions.
 424         (while paths
 425           (setq path (file-name-as-directory
 426                       (expand-file-name (or (car paths) ".")))
 427                 comps-in-path
 428                 (and (file-accessible-directory-p path)
 429                      (file-name-all-completions filename path)))
 430           ;; Go thru each completion found, to see whether it should
 431           ;; be used.
 432           (while comps-in-path
 433             (setq file (car comps-in-path)
 434                   filepath (concat path file))
 435             (if (and (not (member file completions)) ;
 436                      (or (string-equal path cwd)
 437                          (not (file-directory-p filepath)))
 438                      (if eshell-force-execution
 439                          (file-readable-p filepath)
 440                        (file-executable-p filepath)))
 441                 (setq completions (cons file completions)))
 442             (setq comps-in-path (cdr comps-in-path)))
 443           (setq paths (cdr paths)))
 444         ;; Add aliases which are currently visible, and Lisp functions.
 445         (pcomplete-uniqify-list
 446          (if glob-name
 447              completions
 448            (setq completions
 449                  (append (and (eshell-using-module 'eshell-alias)
 450                               (funcall (symbol-function 'eshell-alias-completions)
 451                                        filename))
 452                          (eshell-winnow-list
 453                           (mapcar
 454                            (function
 455                             (lambda (name)
 456                               (substring name 7)))
 457                            (all-completions (concat "eshell/" filename)
 458                                             obarray 'functionp))
 459                           nil '(eshell-find-alias-function))
 460                          completions))
 461            (append (and (or eshell-show-lisp-completions
 462                             (and eshell-show-lisp-alternatives
 463                                  (null completions)))
 464                         (all-completions filename obarray 'functionp))
 465                    completions)))))))
 466
 467 (defun eshell-pcomplete (&optional interactively)
 468   "Eshell wrapper for `pcomplete'."
 469   (interactive "p")
 470   ;; Pretend to be pcomplete so that cycling works (bug#13293).
 471   (setq this-command 'pcomplete)
 472   (condition-case nil
 473       (if interactively
 474           (call-interactively 'pcomplete)
 475         (pcomplete))
 476     (text-read-only (completion-at-point)))) ; Workaround for bug#12838.
 477
 478 (provide 'em-cmpl)
 479
 480 ;; Local Variables:
 481 ;; generated-autoload-file: "esh-groups.el"
 482 ;; End:
 483
 484 ;;; em-cmpl.el ends here