code.delx.au - gnu-emacs-elpa/blob - company.el

   1 ;;; company.el --- Modular in-buffer completion framework  -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 2009-2013  Free Software Foundation, Inc.
   4
   5 ;; Author: Nikolaj Schumacher
   6 ;; Maintainer: Dmitry Gutov <dgutov@yandex.ru>
   7 ;; Version: 0.6.8
   8 ;; Keywords: abbrev, convenience, matching
   9 ;; URL: http://company-mode.github.com/
  10 ;; Compatibility: GNU Emacs 22.x, GNU Emacs 23.x, GNU Emacs 24.x
  11
  12 ;; This file is part of GNU Emacs.
  13
  14 ;; GNU Emacs is free software: you can redistribute it and/or modify
  15 ;; it under the terms of the GNU General Public License as published by
  16 ;; the Free Software Foundation, either version 3 of the License, or
  17 ;; (at your option) any later version.
  18
  19 ;; GNU Emacs is distributed in the hope that it will be useful,
  20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 ;; GNU General Public License for more details.
  23
  24 ;; You should have received a copy of the GNU General Public License
  25 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  26
  27 ;;; Commentary:
  28 ;;
  29 ;; Company is a modular completion mechanism.  Modules for retrieving completion
  30 ;; candidates are called back-ends, modules for displaying them are front-ends.
  31 ;;
  32 ;; Company comes with many back-ends, e.g. `company-elisp'.  These are
  33 ;; distributed in separate files and can be used individually.
  34 ;;
  35 ;; Place company.el and the back-ends you want to use in a directory and add the
  36 ;; following to your .emacs:
  37 ;; (add-to-list 'load-path "/path/to/company")
  38 ;; (autoload 'company-mode "company" nil t)
  39 ;;
  40 ;; Enable company-mode with M-x company-mode.  For further information look at
  41 ;; the documentation for `company-mode' (C-h f company-mode RET)
  42 ;;
  43 ;; If you want to start a specific back-end, call it interactively or use
  44 ;; `company-begin-backend'.  For example:
  45 ;; M-x company-abbrev will prompt for and insert an abbrev.
  46 ;;
  47 ;; To write your own back-end, look at the documentation for `company-backends'.
  48 ;; Here is a simple example completing "foo":
  49 ;;
  50 ;; (defun company-my-backend (command &optional arg &rest ignored)
  51 ;;   (case command
  52 ;;     (prefix (when (looking-back "foo\\>")
  53 ;;               (match-string 0)))
  54 ;;     (candidates (list "foobar" "foobaz" "foobarbaz"))
  55 ;;     (meta (format "This value is named %s" arg))))
  56 ;;
  57 ;; Sometimes it is a good idea to mix several back-ends together, for example to
  58 ;; enrich gtags with dabbrev-code results (to emulate local variables).
  59 ;; To do this, add a list with both back-ends as an element in company-backends.
  60 ;;
  61 ;; Known Issues:
  62 ;; When point is at the very end of the buffer, the pseudo-tooltip appears very
  63 ;; wrong, unless company is allowed to temporarily insert a fake newline.
  64 ;; This behavior is enabled by `company-end-of-buffer-workaround'.
  65 ;;
  66 ;;; Change Log:
  67 ;;
  68 ;; See NEWS.md in the repository.
  69
  70 ;;; Code:
  71
  72 (eval-when-compile (require 'cl))
  73
  74 (add-to-list 'debug-ignored-errors "^.* frontend cannot be used twice$")
  75 (add-to-list 'debug-ignored-errors "^Echo area cannot be used twice$")
  76 (add-to-list 'debug-ignored-errors "^No \\(document\\|loc\\)ation available$")
  77 (add-to-list 'debug-ignored-errors "^Company not ")
  78 (add-to-list 'debug-ignored-errors "^No candidate number ")
  79 (add-to-list 'debug-ignored-errors "^Cannot complete at point$")
  80 (add-to-list 'debug-ignored-errors "^No other back-end$")
  81
  82 (defgroup company nil
  83   "Extensible inline text completion mechanism"
  84   :group 'abbrev
  85   :group 'convenience
  86   :group 'matching)
  87
  88 (defface company-tooltip
  89   '((default :foreground "black")
  90     (((class color) (min-colors 88) (background light))
  91      (:background "cornsilk"))
  92     (((class color) (min-colors 88) (background dark))
  93      (:background "yellow")))
  94   "Face used for the tooltip.")
  95
  96 (defface company-tooltip-selection
  97   '((default :inherit company-tooltip)
  98     (((class color) (min-colors 88) (background light))
  99      (:background "light blue"))
 100     (((class color) (min-colors 88) (background dark))
 101      (:background "orange1"))
 102     (t (:background "green")))
 103   "Face used for the selection in the tooltip.")
 104
 105 (defface company-tooltip-mouse
 106   '((default :inherit highlight))
 107   "Face used for the tooltip item under the mouse.")
 108
 109 (defface company-tooltip-common
 110   '((default :inherit company-tooltip)
 111     (((background light))
 112      :foreground "darkred")
 113     (((background dark))
 114      :foreground "red"))
 115   "Face used for the common completion in the tooltip.")
 116
 117 (defface company-tooltip-common-selection
 118   '((default :inherit company-tooltip-selection)
 119     (((background light))
 120      :foreground "darkred")
 121     (((background dark))
 122      :foreground "red"))
 123   "Face used for the selected common completion in the tooltip.")
 124
 125 (defface company-preview
 126   '((t :background "blue4"
 127        :foreground "wheat"))
 128   "Face used for the completion preview.")
 129
 130 (defface company-preview-common
 131   '((t :inherit company-preview
 132        :foreground "red"))
 133   "Face used for the common part of the completion preview.")
 134
 135 (defface company-preview-search
 136   '((t :inherit company-preview
 137        :background "blue1"))
 138   "Face used for the search string in the completion preview.")
 139
 140 (defface company-echo nil
 141   "Face used for completions in the echo area.")
 142
 143 (defface company-echo-common
 144   '((((background dark)) (:foreground "firebrick1"))
 145     (((background light)) (:background "firebrick4")))
 146   "Face used for the common part of completions in the echo area.")
 147
 148 (defun company-frontends-set (variable value)
 149   ;; uniquify
 150   (let ((remainder value))
 151     (setcdr remainder (delq (car remainder) (cdr remainder))))
 152   (and (memq 'company-pseudo-tooltip-unless-just-one-frontend value)
 153        (memq 'company-pseudo-tooltip-frontend value)
 154        (error "Pseudo tooltip frontend cannot be used twice"))
 155   (and (memq 'company-preview-if-just-one-frontend value)
 156        (memq 'company-preview-frontend value)
 157        (error "Preview frontend cannot be used twice"))
 158   (and (memq 'company-echo value)
 159        (memq 'company-echo-metadata-frontend value)
 160        (error "Echo area cannot be used twice"))
 161   ;; preview must come last
 162   (dolist (f '(company-preview-if-just-one-frontend company-preview-frontend))
 163     (when (memq f value)
 164       (setq value (append (delq f value) (list f)))))
 165   (set variable value))
 166
 167 (defcustom company-frontends '(company-pseudo-tooltip-unless-just-one-frontend
 168                                company-preview-if-just-one-frontend
 169                                company-echo-metadata-frontend)
 170   "The list of active front-ends (visualizations).
 171 Each front-end is a function that takes one argument.  It is called with
 172 one of the following arguments:
 173
 174 'show: When the visualization should start.
 175
 176 'hide: When the visualization should end.
 177
 178 'update: When the data has been updated.
 179
 180 'pre-command: Before every command that is executed while the
 181 visualization is active.
 182
 183 'post-command: After every command that is executed while the
 184 visualization is active.
 185
 186 The visualized data is stored in `company-prefix', `company-candidates',
 187 `company-common', `company-selection', `company-point' and
 188 `company-search-string'."
 189   :set 'company-frontends-set
 190   :type '(repeat (choice (const :tag "echo" company-echo-frontend)
 191                          (const :tag "echo, strip common"
 192                                 company-echo-strip-common-frontend)
 193                          (const :tag "show echo meta-data in echo"
 194                                 company-echo-metadata-frontend)
 195                          (const :tag "pseudo tooltip"
 196                                 company-pseudo-tooltip-frontend)
 197                          (const :tag "pseudo tooltip, multiple only"
 198                                 company-pseudo-tooltip-unless-just-one-frontend)
 199                          (const :tag "preview" company-preview-frontend)
 200                          (const :tag "preview, unique only"
 201                                 company-preview-if-just-one-frontend)
 202                          (function :tag "custom function" nil))))
 203
 204 (defcustom company-tooltip-limit 10
 205   "The maximum number of candidates in the tooltip"
 206   :type 'integer)
 207
 208 (defcustom company-tooltip-minimum 6
 209   "The minimum height of the tooltip.
 210 If this many lines are not available, prefer to display the tooltip above."
 211   :type 'integer)
 212
 213 (defvar company-safe-backends
 214   '((company-abbrev . "Abbrev")
 215     (company-clang . "Clang")
 216     (company-css . "CSS")
 217     (company-dabbrev . "dabbrev for plain text")
 218     (company-dabbrev-code . "dabbrev for code")
 219     (company-eclim . "Eclim (an Eclipse interface)")
 220     (company-elisp . "Emacs Lisp")
 221     (company-etags . "etags")
 222     (company-files . "Files")
 223     (company-gtags . "GNU Global")
 224     (company-ispell . "Ispell")
 225     (company-keywords . "Programming language keywords")
 226     (company-nxml . "nxml")
 227     (company-oddmuse . "Oddmuse")
 228     (company-pysmell . "PySmell")
 229     (company-ropemacs . "ropemacs")
 230     (company-semantic . "Semantic")
 231     (company-tempo . "Tempo templates")
 232     (company-xcode . "Xcode")))
 233 (put 'company-safe-backends 'risky-local-variable t)
 234
 235 (defun company-safe-backends-p (backends)
 236   (and (consp backends)
 237        (not (dolist (backend backends)
 238               (unless (if (consp backend)
 239                           (company-safe-backends-p backend)
 240                         (assq backend company-safe-backends))
 241                 (return t))))))
 242
 243 (defun company-capf (command &optional arg &rest args)
 244   "`company-mode' back-end using `completion-at-point-functions'.
 245 Requires Emacs 24.1 or newer."
 246   (interactive (list 'interactive))
 247   (case command
 248     (interactive (company-begin-backend 'company-capf))
 249     (prefix
 250      (let ((res (run-hook-wrapped 'completion-at-point-functions
 251                                   ;; Ignore misbehaving functions.
 252                                   #'completion--capf-wrapper 'optimist)))
 253        (when (consp res)
 254          (if (> (nth 2 res) (point))
 255              'stop
 256            (buffer-substring-no-properties (nth 1 res) (point))))))
 257     (candidates
 258      (let ((res (run-hook-wrapped 'completion-at-point-functions
 259                                   ;; Ignore misbehaving functions.
 260                                   #'completion--capf-wrapper 'optimist)))
 261        (when (consp res)
 262          (all-completions arg (nth 3 res)
 263                           (plist-get (nthcdr 4 res) :predicate)))))))
 264
 265 (defcustom company-backends '(company-elisp company-nxml company-css
 266                               company-semantic company-clang company-eclim
 267                               company-xcode company-ropemacs
 268                               (company-gtags company-etags company-dabbrev-code
 269                                company-keywords)
 270                               company-oddmuse company-files company-dabbrev)
 271   "The list of active back-ends (completion engines).
 272 Each list elements can itself be a list of back-ends.  In that case their
 273 completions are merged.  Otherwise only the first matching back-end returns
 274 results.
 275
 276 `company-begin-backend' can be used to start a specific back-end,
 277 `company-other-backend' will skip to the next matching back-end in the list.
 278
 279 Each back-end is a function that takes a variable number of arguments.
 280 The first argument is the command requested from the back-end.  It is one
 281 of the following:
 282
 283 `prefix': The back-end should return the text to be completed.  It must be text
 284 immediately before `point'.  Returning nil passes control to the next back-end.
 285 The function should return 'stop if it should complete but cannot \(e.g. if it
 286 is in the middle of a string\).  Instead of a string, the back-end may return a
 287 cons where car is the prefix and cdr is used in `company-minimum-prefix-length'
 288 test. It's either number or t, in which case the test automatically succeeds.
 289
 290 `candidates': The second argument is the prefix to be completed.  The
 291 return value should be a list of candidates that start with the prefix.
 292
 293 Optional commands:
 294
 295 `sorted': The back-end may return t here to indicate that the candidates
 296 are sorted and will not need to be sorted again.
 297
 298 `duplicates': If non-nil, company will take care of removing duplicates
 299 from the list.
 300
 301 `no-cache': Usually company doesn't ask for candidates again as completion
 302 progresses, unless the back-end returns t for this command.  The second
 303 argument is the latest prefix.
 304
 305 `meta': The second argument is a completion candidate.  The back-end should
 306 return a (short) documentation string for it.
 307
 308 `doc-buffer': The second argument is a completion candidate.
 309 The back-end should create a buffer (preferably with `company-doc-buffer'),
 310 fill it with documentation and return it.
 311
 312 `location': The second argument is a completion candidate.  The back-end can
 313 return the cons of buffer and buffer location, or of file and line
 314 number where the completion candidate was defined.
 315
 316 `require-match': If this value is t, the user is not allowed to enter anything
 317 not offered as a candidate.  Use with care!  The default value nil gives the
 318 user that choice with `company-require-match'.  Return value 'never overrides
 319 that option the other way around.
 320
 321 `init': Called once for each buffer, the back-end can check for external
 322 programs and files and load any required libraries.  Raising an error here will
 323 show up in message log once, and the backend will not be used for completion.
 324
 325 `post-completion': Called after a completion candidate has been inserted into
 326 the buffer.  The second argument is the candidate.  Can be used to modify it,
 327 e.g. to expand a snippet.
 328
 329 The back-end should return nil for all commands it does not support or
 330 does not know about.  It should also be callable interactively and use
 331 `company-begin-backend' to start itself in that case."
 332   :type `(repeat
 333           (choice
 334            :tag "Back-end"
 335            ,@(mapcar (lambda (b) `(const :tag ,(cdr b) ,(car b)))
 336                      company-safe-backends)
 337            (symbol :tag "User defined")
 338            (repeat :tag "Merged Back-ends"
 339                    (choice :tag "Back-end"
 340                            ,@(mapcar (lambda (b)
 341                                        `(const :tag ,(cdr b) ,(car b)))
 342                                      company-safe-backends)
 343                            (symbol :tag "User defined"))))))
 344
 345 (put 'company-backends 'safe-local-variable 'company-safe-backends-p)
 346
 347 (defcustom company-completion-started-hook nil
 348   "Hook run when company starts completing.
 349 The hook is called with one argument that is non-nil if the completion was
 350 started manually."
 351   :type 'hook)
 352
 353 (defcustom company-completion-cancelled-hook nil
 354   "Hook run when company cancels completing.
 355 The hook is called with one argument that is non-nil if the completion was
 356 aborted manually."
 357   :type 'hook)
 358
 359 (defcustom company-completion-finished-hook nil
 360   "Hook run when company successfully completes.
 361 The hook is called with the selected candidate as an argument.
 362
 363 If you indend to use it to post-process candidates from a specific back-end,
 364 consider using the `post-completion' command instead."
 365   :type 'hook)
 366
 367 (defcustom company-minimum-prefix-length 3
 368   "The minimum prefix length for automatic completion."
 369   :type '(integer :tag "prefix length"))
 370
 371 (defcustom company-require-match 'company-explicit-action-p
 372   "If enabled, disallow non-matching input.
 373 This can be a function do determine if a match is required.
 374
 375 This can be overridden by the back-end, if it returns t or 'never to
 376 'require-match.  `company-auto-complete' also takes precedence over this."
 377   :type '(choice (const :tag "Off" nil)
 378                  (function :tag "Predicate function")
 379                  (const :tag "On, if user interaction took place"
 380                         'company-explicit-action-p)
 381                  (const :tag "On" t)))
 382
 383 (defcustom company-auto-complete nil
 384   "Determines when to auto-complete.
 385 If this is enabled, all characters from `company-auto-complete-chars' complete
 386 the selected completion.  This can also be a function."
 387   :type '(choice (const :tag "Off" nil)
 388                  (function :tag "Predicate function")
 389                  (const :tag "On, if user interaction took place"
 390                         'company-explicit-action-p)
 391                  (const :tag "On" t)))
 392
 393 (defcustom company-auto-complete-chars '(?\  ?\) ?.)
 394   "Determines which characters trigger an automatic completion.
 395 See `company-auto-complete'.  If this is a string, each string character causes
 396 completion.  If it is a list of syntax description characters (see
 397 `modify-syntax-entry'), all characters with that syntax auto-complete.
 398
 399 This can also be a function, which is called with the new input and should
 400 return non-nil if company should auto-complete.
 401
 402 A character that is part of a valid candidate never triggers auto-completion."
 403   :type '(choice (string :tag "Characters")
 404                  (set :tag "Syntax"
 405                       (const :tag "Whitespace" ?\ )
 406                       (const :tag "Symbol" ?_)
 407                       (const :tag "Opening parentheses" ?\()
 408                       (const :tag "Closing parentheses" ?\))
 409                       (const :tag "Word constituent" ?w)
 410                       (const :tag "Punctuation." ?.)
 411                       (const :tag "String quote." ?\")
 412                       (const :tag "Paired delimiter." ?$)
 413                       (const :tag "Expression quote or prefix operator." ?\')
 414                       (const :tag "Comment starter." ?<)
 415                       (const :tag "Comment ender." ?>)
 416                       (const :tag "Character-quote." ?/)
 417                       (const :tag "Generic string fence." ?|)
 418                       (const :tag "Generic comment fence." ?!))
 419                  (function :tag "Predicate function")))
 420
 421 (defcustom company-idle-delay .7
 422   "The idle delay in seconds until automatic completions starts.
 423 A value of nil means never complete automatically, t means complete
 424 immediately when a prefix of `company-minimum-prefix-length' is reached."
 425   :type '(choice (const :tag "never (nil)" nil)
 426                  (const :tag "immediate (t)" t)
 427                  (number :tag "seconds")))
 428
 429 (defcustom company-begin-commands t
 430   "A list of commands following which company will start completing.
 431 If this is t, it will complete after any command.  See `company-idle-delay'.
 432
 433 Alternatively any command with a non-nil 'company-begin property is treated as
 434 if it was on this list."
 435   :type '(choice (const :tag "Any command" t)
 436                  (const :tag "Self insert command" '(self-insert-command))
 437                  (repeat :tag "Commands" function)))
 438
 439 (defcustom company-show-numbers nil
 440   "If enabled, show quick-access numbers for the first ten candidates."
 441   :type '(choice (const :tag "off" nil)
 442                  (const :tag "on" t)))
 443
 444 (defvar company-end-of-buffer-workaround t
 445   "Work around a visualization bug when completing at the end of the buffer.
 446 The work-around consists of adding a newline.")
 447
 448 ;;; mode ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 449
 450 (defvar company-mode-map (make-sparse-keymap)
 451   "Keymap used by `company-mode'.")
 452
 453 (defvar company-active-map
 454   (let ((keymap (make-sparse-keymap)))
 455     (define-key keymap "\e\e\e" 'company-abort)
 456     (define-key keymap "\C-g" 'company-abort)
 457     (define-key keymap (kbd "M-n") 'company-select-next)
 458     (define-key keymap (kbd "M-p") 'company-select-previous)
 459     (define-key keymap (kbd "<down>") 'company-select-next-or-abort)
 460     (define-key keymap (kbd "<up>") 'company-select-previous-or-abort)
 461     (define-key keymap [down-mouse-1] 'ignore)
 462     (define-key keymap [down-mouse-3] 'ignore)
 463     (define-key keymap [mouse-1] 'company-complete-mouse)
 464     (define-key keymap [mouse-3] 'company-select-mouse)
 465     (define-key keymap [up-mouse-1] 'ignore)
 466     (define-key keymap [up-mouse-3] 'ignore)
 467     (define-key keymap [return] 'company-complete-selection)
 468     (define-key keymap (kbd "RET") 'company-complete-selection)
 469     (define-key keymap [tab] 'company-complete-common)
 470     (define-key keymap (kbd "TAB") 'company-complete-common)
 471     (define-key keymap (kbd "<f1>") 'company-show-doc-buffer)
 472     (define-key keymap "\C-w" 'company-show-location)
 473     (define-key keymap "\C-s" 'company-search-candidates)
 474     (define-key keymap "\C-\M-s" 'company-filter-candidates)
 475     (dotimes (i 10)
 476       (define-key keymap (vector (+ (aref (kbd "M-0") 0) i))
 477         `(lambda () (interactive) (company-complete-number ,i))))
 478
 479     keymap)
 480   "Keymap that is enabled during an active completion.")
 481
 482 (defvar company--disabled-backends nil)
 483
 484 (defun company-init-backend (backend)
 485   (and (symbolp backend)
 486        (not (fboundp backend))
 487        (ignore-errors (require backend nil t)))
 488
 489   (if (or (symbolp backend)
 490           (functionp backend))
 491       (condition-case err
 492           (progn
 493             (funcall backend 'init)
 494             (put backend 'company-init t))
 495         (error
 496          (put backend 'company-init 'failed)
 497          (unless (memq backend company--disabled-backends)
 498            (message "Company back-end '%s' could not be initialized:\n%s"
 499                     backend (error-message-string err)))
 500          (pushnew backend company--disabled-backends)
 501          nil))
 502     (mapc 'company-init-backend backend)))
 503
 504 (defvar company-default-lighter " company")
 505
 506 (defvar company-lighter company-default-lighter)
 507 (make-variable-buffer-local 'company-lighter)
 508
 509 ;;;###autoload
 510 (define-minor-mode company-mode
 511   "\"complete anything\"; is an in-buffer completion framework.
 512 Completion starts automatically, depending on the values
 513 `company-idle-delay' and `company-minimum-prefix-length'.
 514
 515 Completion can be controlled with the commands:
 516 `company-complete-common', `company-complete-selection', `company-complete',
 517 `company-select-next', `company-select-previous'.  If these commands are
 518 called before `company-idle-delay', completion will also start.
 519
 520 Completions can be searched with `company-search-candidates' or
 521 `company-filter-candidates'.  These can be used while completion is
 522 inactive, as well.
 523
 524 The completion data is retrieved using `company-backends' and displayed using
 525 `company-frontends'.  If you want to start a specific back-end, call it
 526 interactively or use `company-begin-backend'.
 527
 528 regular keymap (`company-mode-map'):
 529
 530 \\{company-mode-map}
 531 keymap during active completions (`company-active-map'):
 532
 533 \\{company-active-map}"
 534   nil company-lighter company-mode-map
 535   (if company-mode
 536       (progn
 537         (add-hook 'pre-command-hook 'company-pre-command nil t)
 538         (add-hook 'post-command-hook 'company-post-command nil t)
 539         (mapc 'company-init-backend company-backends))
 540     (remove-hook 'pre-command-hook 'company-pre-command t)
 541     (remove-hook 'post-command-hook 'company-post-command t)
 542     (company-cancel)
 543     (kill-local-variable 'company-point)))
 544
 545 ;;;###autoload
 546 (define-globalized-minor-mode global-company-mode company-mode company-mode-on)
 547
 548 (defun company-mode-on ()
 549   (unless (or noninteractive (eq (aref (buffer-name) 0) ?\s))
 550     (company-mode 1)))
 551
 552 (defsubst company-assert-enabled ()
 553   (unless company-mode
 554     (company-uninstall-map)
 555     (error "Company not enabled")))
 556
 557 ;;; keymaps ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 558
 559 (defvar company-my-keymap nil)
 560 (make-variable-buffer-local 'company-my-keymap)
 561
 562 (defvar company-emulation-alist '((t . nil)))
 563
 564 (defsubst company-enable-overriding-keymap (keymap)
 565   (company-uninstall-map)
 566   (setq company-my-keymap keymap))
 567
 568 (defun company-ensure-emulation-alist ()
 569   (unless (eq 'company-emulation-alist (car emulation-mode-map-alists))
 570     (setq emulation-mode-map-alists
 571           (cons 'company-emulation-alist
 572                 (delq 'company-emulation-alist emulation-mode-map-alists)))))
 573
 574 (defun company-install-map ()
 575   (unless (or (cdar company-emulation-alist)
 576               (null company-my-keymap))
 577     (setf (cdar company-emulation-alist) company-my-keymap)))
 578
 579 (defun company-uninstall-map ()
 580   (setf (cdar company-emulation-alist) nil))
 581
 582 ;; Hack:
 583 ;; Emacs calculates the active keymaps before reading the event.  That means we
 584 ;; cannot change the keymap from a timer.  So we send a bogus command.
 585 (defun company-ignore ()
 586   (interactive)
 587   (setq this-command last-command))
 588
 589 (global-set-key '[31415926] 'company-ignore)
 590
 591 (defun company-input-noop ()
 592   (push 31415926 unread-command-events))
 593
 594 ;; Hack:
 595 ;; posn-col-row is incorrect in older Emacsen when line-spacing is set
 596 (defun company--col-row (&optional pos)
 597   (let ((posn (posn-at-point pos)))
 598     (cons (car (posn-col-row posn)) (cdr (posn-actual-col-row posn)))))
 599
 600 (defsubst company--column (&optional pos)
 601   (car (posn-col-row (posn-at-point pos))))
 602
 603 (defsubst company--row (&optional pos)
 604   (cdr (posn-actual-col-row (posn-at-point pos))))
 605
 606 ;;; backends ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 607
 608 (defun company-grab (regexp &optional expression limit)
 609   (when (looking-back regexp limit)
 610     (or (match-string-no-properties (or expression 0)) "")))
 611
 612 (defun company-grab-line (regexp &optional expression)
 613   (company-grab regexp expression (point-at-bol)))
 614
 615 (defun company-grab-symbol ()
 616   (if (looking-at "\\_>")
 617       (buffer-substring (point) (save-excursion (skip-syntax-backward "w_")
 618                                                 (point)))
 619     (unless (and (char-after) (memq (char-syntax (char-after)) '(?w ?_)))
 620       "")))
 621
 622 (defun company-grab-word ()
 623   (if (looking-at "\\>")
 624       (buffer-substring (point) (save-excursion (skip-syntax-backward "w")
 625                                                 (point)))
 626     (unless (and (char-after) (eq (char-syntax (char-after)) ?w))
 627       "")))
 628
 629 (defun company-in-string-or-comment ()
 630   (let ((ppss (syntax-ppss)))
 631     (or (car (setq ppss (nthcdr 3 ppss)))
 632         (car (setq ppss (cdr ppss)))
 633         (nth 3 ppss))))
 634
 635 (if (fboundp 'locate-dominating-file)
 636     (defalias 'company-locate-dominating-file 'locate-dominating-file)
 637   (defun company-locate-dominating-file (file name)
 638     (catch 'root
 639       (let ((dir (file-name-directory file))
 640             (prev-dir nil))
 641         (while (not (equal dir prev-dir))
 642           (when (file-exists-p (expand-file-name name dir))
 643             (throw 'root dir))
 644           (setq prev-dir dir
 645                 dir (file-name-directory (directory-file-name dir))))))))
 646
 647 (defun company-call-backend (&rest args)
 648   (if (functionp company-backend)
 649       (apply company-backend args)
 650     (apply 'company--multi-backend-adapter company-backend args)))
 651
 652 (defun company--multi-backend-adapter (backends command &rest args)
 653   (let ((backends (loop for b in backends
 654                         when (not (and (symbolp b)
 655                                        (eq 'failed (get b 'company-init))))
 656                         collect b)))
 657     (case command
 658       (candidates
 659        (loop for backend in backends
 660              when (equal (funcall backend 'prefix)
 661                          (car args))
 662              append (apply backend 'candidates args)))
 663       (sorted nil)
 664       (duplicates t)
 665       (otherwise
 666        (let (value)
 667          (dolist (backend backends)
 668            (when (setq value (apply backend command args))
 669              (return value))))))))
 670
 671 ;;; completion mechanism ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 672
 673 (defvar company-backend nil)
 674 (make-variable-buffer-local 'company-backend)
 675
 676 (defvar company-prefix nil)
 677 (make-variable-buffer-local 'company-prefix)
 678
 679 (defvar company-candidates nil)
 680 (make-variable-buffer-local 'company-candidates)
 681
 682 (defvar company-candidates-length nil)
 683 (make-variable-buffer-local 'company-candidates-length)
 684
 685 (defvar company-candidates-cache nil)
 686 (make-variable-buffer-local 'company-candidates-cache)
 687
 688 (defvar company-candidates-predicate nil)
 689 (make-variable-buffer-local 'company-candidates-predicate)
 690
 691 (defvar company-common nil)
 692 (make-variable-buffer-local 'company-common)
 693
 694 (defvar company-selection 0)
 695 (make-variable-buffer-local 'company-selection)
 696
 697 (defvar company-selection-changed nil)
 698 (make-variable-buffer-local 'company-selection-changed)
 699
 700 (defvar company--explicit-action nil
 701   "Non-nil, if explicit completion took place.")
 702 (make-variable-buffer-local 'company--explicit-action)
 703
 704 (defvar company--auto-completion nil
 705   "Non-nil when current candidate is being completed automatically.
 706 Controlled by `company-auto-complete'.")
 707
 708 (defvar company--point-max nil)
 709 (make-variable-buffer-local 'company--point-max)
 710
 711 (defvar company-point nil)
 712 (make-variable-buffer-local 'company-point)
 713
 714 (defvar company-timer nil)
 715
 716 (defvar company-added-newline nil)
 717 (make-variable-buffer-local 'company-added-newline)
 718
 719 (defsubst company-strip-prefix (str)
 720   (substring str (length company-prefix)))
 721
 722 (defmacro company-with-candidate-inserted (candidate &rest body)
 723   "Evaluate BODY with CANDIDATE temporarily inserted.
 724 This is a tool for back-ends that need candidates inserted before they
 725 can retrieve meta-data for them."
 726   (declare (indent 1))
 727   `(let ((inhibit-modification-hooks t)
 728          (inhibit-point-motion-hooks t)
 729          (modified-p (buffer-modified-p)))
 730      (insert (company-strip-prefix ,candidate))
 731      (unwind-protect
 732          (progn ,@body)
 733        (delete-region company-point (point)))))
 734
 735 (defun company-explicit-action-p ()
 736   "Return whether explicit completion action was taken by the user."
 737   (or company--explicit-action
 738       company-selection-changed))
 739
 740 (defsubst company-reformat (candidate)
 741   ;; company-ispell needs this, because the results are always lower-case
 742   ;; It's mory efficient to fix it only when they are displayed.
 743   (concat company-prefix (substring candidate (length company-prefix))))
 744
 745 (defun company--should-complete ()
 746   (and (not (or buffer-read-only overriding-terminal-local-map
 747                 overriding-local-map
 748                 (minibufferp)))
 749        ;; Check if in the middle of entering a key combination.
 750        (or (equal (this-command-keys-vector) [])
 751            (not (keymapp (key-binding (this-command-keys-vector)))))
 752        (eq company-idle-delay t)
 753        (or (eq t company-begin-commands)
 754            (memq this-command company-begin-commands)
 755            (and (symbolp this-command) (get this-command 'company-begin)))
 756        (not (and transient-mark-mode mark-active))))
 757
 758 (defsubst company-call-frontends (command)
 759   (dolist (frontend company-frontends)
 760     (condition-case err
 761         (funcall frontend command)
 762       (error (error "Company: Front-end %s error \"%s\" on command %s"
 763                     frontend (error-message-string err) command)))))
 764
 765 (defsubst company-set-selection (selection &optional force-update)
 766   (setq selection (max 0 (min (1- company-candidates-length) selection)))
 767   (when (or force-update (not (equal selection company-selection)))
 768     (setq company-selection selection
 769           company-selection-changed t)
 770     (company-call-frontends 'update)))
 771
 772 (defun company-apply-predicate (candidates predicate)
 773   (let (new)
 774     (dolist (c candidates)
 775       (when (funcall predicate c)
 776         (push c new)))
 777     (nreverse new)))
 778
 779 (defun company-update-candidates (candidates)
 780   (setq company-candidates-length (length candidates))
 781   (if (> company-selection 0)
 782       ;; Try to restore the selection
 783       (let ((selected (nth company-selection company-candidates)))
 784         (setq company-selection 0
 785               company-candidates candidates)
 786         (when selected
 787           (while (and candidates (string< (pop candidates) selected))
 788             (incf company-selection))
 789           (unless candidates
 790             ;; Make sure selection isn't out of bounds.
 791             (setq company-selection (min (1- company-candidates-length)
 792                                          company-selection)))))
 793     (setq company-selection 0
 794           company-candidates candidates))
 795   ;; Save in cache:
 796   (push (cons company-prefix company-candidates) company-candidates-cache)
 797   ;; Calculate common.
 798   (let ((completion-ignore-case (company-call-backend 'ignore-case)))
 799     (setq company-common (company--safe-candidate
 800                           (try-completion company-prefix company-candidates))))
 801   (when (eq company-common t)
 802     (setq company-candidates nil)))
 803
 804 (defun company--safe-candidate (str)
 805   (or (company-call-backend 'crop str)
 806       str))
 807
 808 (defun company-calculate-candidates (prefix)
 809   (let ((candidates (cdr (assoc prefix company-candidates-cache)))
 810         (ignore-case (company-call-backend 'ignore-case)))
 811     (or candidates
 812         (when company-candidates-cache
 813           (let ((len (length prefix))
 814                 (completion-ignore-case ignore-case)
 815                 prev)
 816             (dotimes (i (1+ len))
 817               (when (setq prev (cdr (assoc (substring prefix 0 (- len i))
 818                                            company-candidates-cache)))
 819                 (setq candidates (all-completions prefix prev))
 820                 (return t)))))
 821         ;; no cache match, call back-end
 822         (progn
 823           (setq candidates (company-call-backend 'candidates prefix))
 824           (when company-candidates-predicate
 825             (setq candidates
 826                   (company-apply-predicate candidates
 827                                            company-candidates-predicate)))
 828           (unless (company-call-backend 'sorted)
 829             (setq candidates (sort candidates 'string<)))
 830           (when (company-call-backend 'duplicates)
 831             ;; strip duplicates
 832             (let ((c2 candidates))
 833               (while c2
 834                 (setcdr c2 (progn (while (equal (pop c2) (car c2)))
 835                                   c2)))))))
 836     (when candidates
 837       (if (or (cdr candidates)
 838               (not (eq t (compare-strings (car candidates) nil nil
 839                                           prefix nil nil ignore-case))))
 840           candidates
 841         ;; Already completed and unique; don't start.
 842         t))))
 843
 844 (defun company-idle-begin (buf win tick pos)
 845   (and company-mode
 846        (eq buf (current-buffer))
 847        (eq win (selected-window))
 848        (eq tick (buffer-chars-modified-tick))
 849        (eq pos (point))
 850        (not company-candidates)
 851        (not (equal (point) company-point))
 852        (let ((company-idle-delay t)
 853              (company-begin-commands t))
 854          (company-begin)
 855          (when company-candidates
 856            (company-input-noop)
 857            (company-post-command)))))
 858
 859 (defun company-auto-begin ()
 860   (company-assert-enabled)
 861   (and company-mode
 862        (not company-candidates)
 863        (let ((company-idle-delay t)
 864              (company-minimum-prefix-length 0)
 865              (company-begin-commands t))
 866          (company-begin)))
 867   ;; Return non-nil if active.
 868   company-candidates)
 869
 870 (defun company-manual-begin ()
 871   (interactive)
 872   (setq company--explicit-action t)
 873   (unwind-protect
 874       (company-auto-begin)
 875     (unless company-candidates
 876       (setq company--explicit-action nil))))
 877
 878 (defun company-other-backend (&optional backward)
 879   (interactive (list current-prefix-arg))
 880   (company-assert-enabled)
 881   (if company-backend
 882       (let* ((after (cdr (member company-backend company-backends)))
 883              (before (cdr (member company-backend (reverse company-backends))))
 884              (next (if backward
 885                        (append before (reverse after))
 886                      (append after (reverse before)))))
 887         (company-cancel)
 888         (dolist (backend next)
 889           (when (ignore-errors (company-begin-backend backend))
 890             (return t))))
 891     (company-manual-begin))
 892   (unless company-candidates
 893     (error "No other back-end")))
 894
 895 (defun company-require-match-p ()
 896   (let ((backend-value (company-call-backend 'require-match)))
 897     (or (eq backend-value t)
 898         (and (if (functionp company-require-match)
 899                  (funcall company-require-match)
 900                (eq company-require-match t))
 901              (not (eq backend-value 'never))))))
 902
 903 (defun company-auto-complete-p (input)
 904   "Return non-nil, if input starts with punctuation or parentheses."
 905   (and (if (functionp company-auto-complete)
 906            (funcall company-auto-complete)
 907          company-auto-complete)
 908        (if (functionp company-auto-complete-chars)
 909            (funcall company-auto-complete-chars input)
 910          (if (consp company-auto-complete-chars)
 911              (memq (char-syntax (string-to-char input))
 912                    company-auto-complete-chars)
 913            (string-match (substring input 0 1) company-auto-complete-chars)))))
 914
 915 (defun company--incremental-p ()
 916   (and (> (point) company-point)
 917        (> (point-max) company--point-max)
 918        (not (eq this-command 'backward-delete-char-untabify))
 919        (equal (buffer-substring (- company-point (length company-prefix))
 920                                 company-point)
 921               company-prefix)))
 922
 923 (defsubst company--string-incremental-p (old-prefix new-prefix)
 924   (and (> (length new-prefix) (length old-prefix))
 925        (equal old-prefix (substring new-prefix 0 (length old-prefix)))))
 926
 927 (defun company--continue-failed (new-prefix)
 928   (when (company--incremental-p)
 929     (let ((input (buffer-substring-no-properties (point) company-point)))
 930       (cond
 931        ((company-auto-complete-p input)
 932         ;; auto-complete
 933         (save-excursion
 934           (goto-char company-point)
 935           (let ((company--auto-completion t))
 936             (company-complete-selection))
 937           nil))
 938        ((and (company--string-incremental-p company-prefix new-prefix)
 939              (company-require-match-p))
 940         ;; wrong incremental input, but required match
 941         (backward-delete-char (length input))
 942         (ding)
 943         (message "Matching input is required")
 944         company-candidates)
 945        ((equal company-prefix (car company-candidates))
 946         ;; last input was actually success
 947         (company-cancel company-prefix)
 948         nil)))))
 949
 950 (defun company--good-prefix-p (prefix)
 951   (and (or (company-explicit-action-p)
 952            (unless (eq prefix 'stop)
 953              (or (eq (cdr-safe prefix) t)
 954                  (>= (or (cdr-safe prefix) (length prefix))
 955                      company-minimum-prefix-length))))
 956        (stringp (or (car-safe prefix) prefix))))
 957
 958 (defun company--continue ()
 959   (when (company-call-backend 'no-cache company-prefix)
 960     ;; Don't complete existing candidates, fetch new ones.
 961     (setq company-candidates-cache nil))
 962   (let* ((new-prefix (company-call-backend 'prefix))
 963          (c (when (and (company--good-prefix-p new-prefix)
 964                        (setq new-prefix (or (car-safe new-prefix) new-prefix))
 965                        (= (- (point) (length new-prefix))
 966                           (- company-point (length company-prefix))))
 967               (setq new-prefix (or (car-safe new-prefix) new-prefix))
 968               (company-calculate-candidates new-prefix))))
 969     (or (cond
 970          ((eq c t)
 971           ;; t means complete/unique.
 972           (company-cancel new-prefix)
 973           nil)
 974          ((consp c)
 975           ;; incremental match
 976           (setq company-prefix new-prefix)
 977           (company-update-candidates c)
 978           c)
 979          (t (company--continue-failed new-prefix)))
 980         (company-cancel))))
 981
 982 (defun company--begin-new ()
 983   (let (prefix c)
 984     (dolist (backend (if company-backend
 985                          ;; prefer manual override
 986                          (list company-backend)
 987                        company-backends))
 988       (setq prefix
 989             (if (or (symbolp backend)
 990                     (functionp backend))
 991                 (when (or (not (symbolp backend))
 992                           (eq t (get backend 'company-init))
 993                           (unless (get backend 'company-init)
 994                             (company-init-backend backend)))
 995                   (funcall backend 'prefix))
 996               (company--multi-backend-adapter backend 'prefix)))
 997       (when prefix
 998         (when (company--good-prefix-p prefix)
 999           (setq prefix (or (car-safe prefix) prefix)
1000                 company-backend backend
1001                 c (company-calculate-candidates prefix))
1002           ;; t means complete/unique.  We don't start, so no hooks.
1003           (if (not (consp c))
1004               (when company--explicit-action
1005                 (message "No completion found"))
1006             (setq company-prefix prefix)
1007             (when (symbolp backend)
1008               (setq company-lighter (concat " " (symbol-name backend))))
1009             (company-update-candidates c)
1010             (run-hook-with-args 'company-completion-started-hook
1011                                 (company-explicit-action-p))
1012             (company-call-frontends 'show)))
1013         (return c)))))
1014
1015 (defun company-begin ()
1016   (or (and company-candidates (company--continue))
1017       (and (company--should-complete) (company--begin-new)))
1018   (when company-candidates
1019     (when (and company-end-of-buffer-workaround (eobp))
1020       (save-excursion (insert "\n"))
1021       (setq company-added-newline (buffer-chars-modified-tick)))
1022     (setq company-point (point)
1023           company--point-max (point-max))
1024     (company-ensure-emulation-alist)
1025     (company-enable-overriding-keymap company-active-map)
1026     (company-call-frontends 'update)))
1027
1028 (defun company-cancel (&optional result)
1029   (and company-added-newline
1030        (> (point-max) (point-min))
1031        (let ((tick (buffer-chars-modified-tick)))
1032          (delete-region (1- (point-max)) (point-max))
1033          (equal tick company-added-newline))
1034        ;; Only set unmodified when tick remained the same since insert.
1035        (set-buffer-modified-p nil))
1036   (when company-prefix
1037     (if (stringp result)
1038         (progn
1039           (company-call-backend 'pre-completion result)
1040           (run-hook-with-args 'company-completion-finished-hook result)
1041           (company-call-backend 'post-completion result))
1042       (run-hook-with-args 'company-completion-cancelled-hook result)))
1043   (setq company-added-newline nil
1044         company-backend nil
1045         company-prefix nil
1046         company-candidates nil
1047         company-candidates-length nil
1048         company-candidates-cache nil
1049         company-candidates-predicate nil
1050         company-common nil
1051         company-selection 0
1052         company-selection-changed nil
1053         company--explicit-action nil
1054         company-lighter company-default-lighter
1055         company--point-max nil
1056         company-point nil)
1057   (when company-timer
1058     (cancel-timer company-timer))
1059   (company-search-mode 0)
1060   (company-call-frontends 'hide)
1061   (company-enable-overriding-keymap nil))
1062
1063 (defun company-abort ()
1064   (interactive)
1065   (company-cancel t)
1066   ;; Don't start again, unless started manually.
1067   (setq company-point (point)))
1068
1069 (defun company-finish (result)
1070   (insert (company-strip-prefix result))
1071   (company-cancel result)
1072   ;; Don't start again, unless started manually.
1073   (setq company-point (point)))
1074
1075 (defsubst company-keep (command)
1076   (and (symbolp command) (get command 'company-keep)))
1077
1078 (defun company-pre-command ()
1079   (unless (company-keep this-command)
1080     (condition-case err
1081         (when company-candidates
1082           (company-call-frontends 'pre-command))
1083       (error (message "Company: An error occurred in pre-command")
1084              (message "%s" (error-message-string err))
1085              (company-cancel))))
1086   (when company-timer
1087     (cancel-timer company-timer)
1088     (setq company-timer nil))
1089   (company-uninstall-map))
1090
1091 (defun company-post-command ()
1092   (unless (company-keep this-command)
1093     (condition-case err
1094         (progn
1095           (unless (equal (point) company-point)
1096             (company-begin))
1097           (if company-candidates
1098               (company-call-frontends 'post-command)
1099             (and (numberp company-idle-delay)
1100                  (or (eq t company-begin-commands)
1101                      (memq this-command company-begin-commands))
1102                  (setq company-timer
1103                        (run-with-timer company-idle-delay nil
1104                                        'company-idle-begin
1105                                        (current-buffer) (selected-window)
1106                                        (buffer-chars-modified-tick) (point))))))
1107       (error (message "Company: An error occurred in post-command")
1108              (message "%s" (error-message-string err))
1109              (company-cancel))))
1110   (company-install-map))
1111
1112 ;;; search ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1113
1114 (defvar company-search-string nil)
1115 (make-variable-buffer-local 'company-search-string)
1116
1117 (defvar company-search-lighter " Search: \"\"")
1118 (make-variable-buffer-local 'company-search-lighter)
1119
1120 (defvar company-search-old-map nil)
1121 (make-variable-buffer-local 'company-search-old-map)
1122
1123 (defvar company-search-old-selection 0)
1124 (make-variable-buffer-local 'company-search-old-selection)
1125
1126 (defun company-search (text lines)
1127   (let ((quoted (regexp-quote text))
1128         (i 0))
1129     (dolist (line lines)
1130       (when (string-match quoted line (length company-prefix))
1131         (return i))
1132       (incf i))))
1133
1134 (defun company-search-printing-char ()
1135   (interactive)
1136   (company-search-assert-enabled)
1137   (setq company-search-string
1138         (concat (or company-search-string "") (string last-command-event))
1139         company-search-lighter (concat " Search: \"" company-search-string
1140                                         "\""))
1141   (let ((pos (company-search company-search-string
1142                               (nthcdr company-selection company-candidates))))
1143     (if (null pos)
1144         (ding)
1145       (company-set-selection (+ company-selection pos) t))))
1146
1147 (defun company-search-repeat-forward ()
1148   "Repeat the incremental search in completion candidates forward."
1149   (interactive)
1150   (company-search-assert-enabled)
1151   (let ((pos (company-search company-search-string
1152                               (cdr (nthcdr company-selection
1153                                            company-candidates)))))
1154     (if (null pos)
1155         (ding)
1156       (company-set-selection (+ company-selection pos 1) t))))
1157
1158 (defun company-search-repeat-backward ()
1159   "Repeat the incremental search in completion candidates backwards."
1160   (interactive)
1161   (company-search-assert-enabled)
1162   (let ((pos (company-search company-search-string
1163                               (nthcdr (- company-candidates-length
1164                                          company-selection)
1165                                       (reverse company-candidates)))))
1166     (if (null pos)
1167         (ding)
1168       (company-set-selection (- company-selection pos 1) t))))
1169
1170 (defun company-create-match-predicate ()
1171   (setq company-candidates-predicate
1172         `(lambda (candidate)
1173            ,(if company-candidates-predicate
1174                 `(and (string-match ,company-search-string candidate)
1175                       (funcall ,company-candidates-predicate
1176                                candidate))
1177               `(string-match ,company-search-string candidate))))
1178   (company-update-candidates
1179    (company-apply-predicate company-candidates company-candidates-predicate))
1180   ;; Invalidate cache.
1181   (setq company-candidates-cache (cons company-prefix company-candidates)))
1182
1183 (defun company-filter-printing-char ()
1184   (interactive)
1185   (company-search-assert-enabled)
1186   (company-search-printing-char)
1187   (company-create-match-predicate)
1188   (company-call-frontends 'update))
1189
1190 (defun company-search-kill-others ()
1191   "Limit the completion candidates to the ones matching the search string."
1192   (interactive)
1193   (company-search-assert-enabled)
1194   (company-create-match-predicate)
1195   (company-search-mode 0)
1196   (company-call-frontends 'update))
1197
1198 (defun company-search-abort ()
1199   "Abort searching the completion candidates."
1200   (interactive)
1201   (company-search-assert-enabled)
1202   (company-set-selection company-search-old-selection t)
1203   (company-search-mode 0))
1204
1205 (defun company-search-other-char ()
1206   (interactive)
1207   (company-search-assert-enabled)
1208   (company-search-mode 0)
1209   (company--unread-last-input))
1210
1211 (defvar company-search-map
1212   (let ((i 0)
1213         (keymap (make-keymap)))
1214     (if (fboundp 'max-char)
1215         (set-char-table-range (nth 1 keymap) (cons #x100 (max-char))
1216                               'company-search-printing-char)
1217       (with-no-warnings
1218         ;; obsolete in Emacs 23
1219         (let ((l (generic-character-list))
1220               (table (nth 1 keymap)))
1221           (while l
1222             (set-char-table-default table (car l) 'company-search-printing-char)
1223             (setq l (cdr l))))))
1224     (define-key keymap [t] 'company-search-other-char)
1225     (while (< i ?\s)
1226       (define-key keymap (make-string 1 i) 'company-search-other-char)
1227       (incf i))
1228     (while (< i 256)
1229       (define-key keymap (vector i) 'company-search-printing-char)
1230       (incf i))
1231     (let ((meta-map (make-sparse-keymap)))
1232       (define-key keymap (char-to-string meta-prefix-char) meta-map)
1233       (define-key keymap [escape] meta-map))
1234     (define-key keymap (vector meta-prefix-char t) 'company-search-other-char)
1235     (define-key keymap "\e\e\e" 'company-search-other-char)
1236     (define-key keymap  [escape escape escape] 'company-search-other-char)
1237
1238     (define-key keymap "\C-g" 'company-search-abort)
1239     (define-key keymap "\C-s" 'company-search-repeat-forward)
1240     (define-key keymap "\C-r" 'company-search-repeat-backward)
1241     (define-key keymap "\C-o" 'company-search-kill-others)
1242     keymap)
1243   "Keymap used for incrementally searching the completion candidates.")
1244
1245 (define-minor-mode company-search-mode
1246   "Search mode for completion candidates.
1247 Don't start this directly, use `company-search-candidates' or
1248 `company-filter-candidates'."
1249   nil company-search-lighter nil
1250   (if company-search-mode
1251       (if (company-manual-begin)
1252           (progn
1253             (setq company-search-old-selection company-selection)
1254             (company-call-frontends 'update))
1255         (setq company-search-mode nil))
1256     (kill-local-variable 'company-search-string)
1257     (kill-local-variable 'company-search-lighter)
1258     (kill-local-variable 'company-search-old-selection)
1259     (company-enable-overriding-keymap company-active-map)))
1260
1261 (defsubst company-search-assert-enabled ()
1262   (company-assert-enabled)
1263   (unless company-search-mode
1264     (company-uninstall-map)
1265     (error "Company not in search mode")))
1266
1267 (defun company-search-candidates ()
1268   "Start searching the completion candidates incrementally.
1269
1270 \\<company-search-map>Search can be controlled with the commands:
1271 - `company-search-repeat-forward' (\\[company-search-repeat-forward])
1272 - `company-search-repeat-backward' (\\[company-search-repeat-backward])
1273 - `company-search-abort' (\\[company-search-abort])
1274
1275 Regular characters are appended to the search string.
1276
1277 The command `company-search-kill-others' (\\[company-search-kill-others]) uses
1278  the search string to limit the completion candidates."
1279   (interactive)
1280   (company-search-mode 1)
1281   (company-enable-overriding-keymap company-search-map))
1282
1283 (defvar company-filter-map
1284   (let ((keymap (make-keymap)))
1285     (define-key keymap [remap company-search-printing-char]
1286       'company-filter-printing-char)
1287     (set-keymap-parent keymap company-search-map)
1288     keymap)
1289   "Keymap used for incrementally searching the completion candidates.")
1290
1291 (defun company-filter-candidates ()
1292   "Start filtering the completion candidates incrementally.
1293 This works the same way as `company-search-candidates' immediately
1294 followed by `company-search-kill-others' after each input."
1295   (interactive)
1296   (company-search-mode 1)
1297   (company-enable-overriding-keymap company-filter-map))
1298
1299 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1300
1301 (defun company-select-next ()
1302   "Select the next candidate in the list."
1303   (interactive)
1304   (when (company-manual-begin)
1305     (company-set-selection (1+ company-selection))))
1306
1307 (defun company-select-previous ()
1308   "Select the previous candidate in the list."
1309   (interactive)
1310   (when (company-manual-begin)
1311     (company-set-selection (1- company-selection))))
1312
1313 (defun company-select-next-or-abort ()
1314   "Select the next candidate if more than one, else abort
1315 and invoke the normal binding."
1316   (interactive)
1317   (if (> company-candidates-length 1)
1318       (company-select-next)
1319     (company-abort)
1320     (company--unread-last-input)))
1321
1322 (defun company-select-previous-or-abort ()
1323   "Select the previous candidate if more than one, else abort
1324 and invoke the normal binding."
1325   (interactive)
1326   (if (> company-candidates-length 1)
1327       (company-select-previous)
1328     (company-abort)
1329     (company--unread-last-input)))
1330
1331 (defun company--inside-tooltip-p (event-col-row row height)
1332   (let* ((ovl company-pseudo-tooltip-overlay)
1333          (column (overlay-get ovl 'company-column))
1334          (width (overlay-get ovl 'company-width))
1335          (evt-col (car event-col-row))
1336          (evt-row (cdr event-col-row)))
1337     (and (>= evt-col column)
1338          (< evt-col (+ column width))
1339          (if (> height 0)
1340              (and (> evt-row row)
1341                   (<= evt-row (+ row height) ))
1342            (and (< evt-row row)
1343                 (>= evt-row (+ row height)))))))
1344
1345 (defun company-select-mouse (event)
1346   "Select the candidate picked by the mouse."
1347   (interactive "e")
1348   (let ((event-col-row (posn-actual-col-row (event-start event)))
1349         (ovl-row (company--row))
1350         (ovl-height (and company-pseudo-tooltip-overlay
1351                          (min (overlay-get company-pseudo-tooltip-overlay
1352                                            'company-height)
1353                               company-candidates-length))))
1354     (if (and ovl-height
1355              (company--inside-tooltip-p event-col-row ovl-row ovl-height))
1356         (progn
1357           (company-set-selection (+ (cdr event-col-row)
1358                                     (if (zerop company-tooltip-offset)
1359                                         -1
1360                                       (- company-tooltip-offset 2))
1361                                     (- ovl-row)
1362                                     (if (< ovl-height 0)
1363                                         (- 1 ovl-height)
1364                                       0)))
1365           t)
1366       (company-abort)
1367       (company--unread-last-input)
1368       nil)))
1369
1370 (defun company-complete-mouse (event)
1371   "Complete the candidate picked by the mouse."
1372   (interactive "e")
1373   (when (company-select-mouse event)
1374     (company-complete-selection)))
1375
1376 (defun company-complete-selection ()
1377   "Complete the selected candidate."
1378   (interactive)
1379   (when (company-manual-begin)
1380     (let ((result (nth company-selection company-candidates)))
1381       (when company--auto-completion
1382         (setq result (company--safe-candidate result)))
1383       (company-finish result))))
1384
1385 (defun company-complete-common ()
1386   "Complete the common part of all candidates."
1387   (interactive)
1388   (when (company-manual-begin)
1389     (if (and (not (cdr company-candidates))
1390              (equal company-common (car company-candidates)))
1391         (company-complete-selection)
1392       (insert (company-strip-prefix company-common)))))
1393
1394 (defun company-complete ()
1395   "Complete the common part of all candidates or the current selection.
1396 The first time this is called, the common part is completed, the second time, or
1397 when the selection has been changed, the selected candidate is completed."
1398   (interactive)
1399   (when (company-manual-begin)
1400     (if (or company-selection-changed
1401             (eq last-command 'company-complete-common))
1402         (call-interactively 'company-complete-selection)
1403       (call-interactively 'company-complete-common)
1404       (setq this-command 'company-complete-common))))
1405
1406 (defun company-complete-number (n)
1407   "Complete the Nth candidate.
1408 To show the number next to the candidates in some back-ends, enable
1409 `company-show-numbers'."
1410   (when (company-manual-begin)
1411     (and (< n 1) (> n company-candidates-length)
1412          (error "No candidate number %d" n))
1413     (decf n)
1414     (company-finish (nth n company-candidates))))
1415
1416 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1417
1418 (defconst company-space-strings-limit 100)
1419
1420 (defconst company-space-strings
1421   (let (lst)
1422     (dotimes (i company-space-strings-limit)
1423       (push (make-string (- company-space-strings-limit 1 i) ?\  ) lst))
1424     (apply 'vector lst)))
1425
1426 (defsubst company-space-string (len)
1427   (if (< len company-space-strings-limit)
1428       (aref company-space-strings len)
1429     (make-string len ?\ )))
1430
1431 (defsubst company-safe-substring (str from &optional to)
1432   (if (> from (string-width str))
1433       ""
1434     (with-temp-buffer
1435       (insert str)
1436       (move-to-column from)
1437       (let ((beg (point)))
1438         (if to
1439             (progn
1440               (move-to-column to)
1441               (concat (buffer-substring beg (point))
1442                       (let ((padding (- to (current-column))))
1443                         (when (> padding 0)
1444                           (company-space-string padding)))))
1445           (buffer-substring beg (point-max)))))))
1446
1447 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1448
1449 (defvar company-last-metadata nil)
1450 (make-variable-buffer-local 'company-last-metadata)
1451
1452 (defun company-fetch-metadata ()
1453   (let ((selected (nth company-selection company-candidates)))
1454     (unless (equal selected (car company-last-metadata))
1455       (setq company-last-metadata
1456             (cons selected (company-call-backend 'meta selected))))
1457     (cdr company-last-metadata)))
1458
1459 (defun company-doc-buffer (&optional string)
1460   (with-current-buffer (get-buffer-create "*Company meta-data*")
1461     (erase-buffer)
1462     (current-buffer)))
1463
1464 (defvar company--electric-commands
1465   '(scroll-other-window scroll-other-window-down)
1466   "List of Commands that won't break out of electric commands.")
1467
1468 (defmacro company--electric-do (&rest body)
1469   (declare (indent 0) (debug t))
1470   `(when (company-manual-begin)
1471      (save-window-excursion
1472        (let ((height (window-height))
1473              (row (company--row))
1474              cmd)
1475          ,@body
1476          (and (< (window-height) height)
1477               (< (- (window-height) row 2) company-tooltip-limit)
1478               (recenter (- (window-height) row 2)))
1479          (while (memq (setq cmd (key-binding (vector (list (read-event)))))
1480                       company--electric-commands)
1481            (call-interactively cmd))
1482          (company--unread-last-input)))))
1483
1484 (defun company--unread-last-input ()
1485   (when last-input-event
1486     (clear-this-command-keys t)
1487     (setq unread-command-events (list last-input-event))))
1488
1489 (defun company-show-doc-buffer ()
1490   "Temporarily show a buffer with the complete documentation for the selection."
1491   (interactive)
1492   (company--electric-do
1493     (let* ((selected (nth company-selection company-candidates))
1494            (doc-buffer (or (company-call-backend 'doc-buffer selected)
1495                            (error "No documentation available"))))
1496       (with-current-buffer doc-buffer
1497         (goto-char (point-min)))
1498       (display-buffer doc-buffer t))))
1499 (put 'company-show-doc-buffer 'company-keep t)
1500
1501 (defun company-show-location ()
1502   "Temporarily display a buffer showing the selected candidate in context."
1503   (interactive)
1504   (company--electric-do
1505     (let* ((selected (nth company-selection company-candidates))
1506            (location (company-call-backend 'location selected))
1507            (pos (or (cdr location) (error "No location available")))
1508            (buffer (or (and (bufferp (car location)) (car location))
1509                        (find-file-noselect (car location) t))))
1510       (with-selected-window (display-buffer buffer t)
1511         (save-restriction
1512           (widen)
1513           (if (bufferp (car location))
1514               (goto-char pos)
1515             (goto-char (point-min))
1516             (forward-line (1- pos))))
1517         (set-window-start nil (point))))))
1518 (put 'company-show-location 'company-keep t)
1519
1520 ;;; package functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1521
1522 (defvar company-callback nil)
1523 (make-variable-buffer-local 'company-callback)
1524
1525 (defvar company-begin-with-marker nil)
1526 (make-variable-buffer-local 'company-begin-with-marker)
1527
1528 (defun company-remove-callback (&optional ignored)
1529   (remove-hook 'company-completion-finished-hook company-callback t)
1530   (remove-hook 'company-completion-cancelled-hook 'company-remove-callback t)
1531   (remove-hook 'company-completion-finished-hook 'company-remove-callback t)
1532   (when company-begin-with-marker
1533     (set-marker company-begin-with-marker nil)))
1534
1535 (defun company-begin-backend (backend &optional callback)
1536   "Start a completion at point using BACKEND."
1537   (interactive (let ((val (completing-read "Company back-end: "
1538                                            obarray
1539                                            'functionp nil "company-")))
1540                  (when val
1541                    (list (intern val)))))
1542   (when (setq company-callback callback)
1543     (add-hook 'company-completion-finished-hook company-callback nil t))
1544   (add-hook 'company-completion-cancelled-hook 'company-remove-callback nil t)
1545   (add-hook 'company-completion-finished-hook 'company-remove-callback nil t)
1546   (setq company-backend backend)
1547   ;; Return non-nil if active.
1548   (or (company-manual-begin)
1549       (progn
1550         (setq company-backend nil)
1551         (error "Cannot complete at point"))))
1552
1553 (defun company-begin-with (candidates
1554                            &optional prefix-length require-match callback)
1555   "Start a completion at point.
1556 CANDIDATES is the list of candidates to use and PREFIX-LENGTH is the length of
1557 the prefix that already is in the buffer before point.  It defaults to 0.
1558
1559 CALLBACK is a function called with the selected result if the user successfully
1560 completes the input.
1561
1562 Example:
1563 \(company-begin-with '\(\"foo\" \"foobar\" \"foobarbaz\"\)\)"
1564   (setq company-begin-with-marker (copy-marker (point) t))
1565   (company-begin-backend
1566    `(lambda (command &optional arg &rest ignored)
1567       (cond
1568        ((eq command 'prefix)
1569         (when (equal (point) (marker-position company-begin-with-marker))
1570           (buffer-substring ,(- (point) (or prefix-length 0)) (point))))
1571        ((eq command 'candidates)
1572         (all-completions arg ',candidates))
1573        ((eq command 'require-match)
1574         ,require-match)))
1575    callback))
1576
1577 ;;; pseudo-tooltip ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1578
1579 (defvar company-pseudo-tooltip-overlay nil)
1580 (make-variable-buffer-local 'company-pseudo-tooltip-overlay)
1581
1582 (defvar company-tooltip-offset 0)
1583 (make-variable-buffer-local 'company-tooltip-offset)
1584
1585 (defun company-pseudo-tooltip-update-offset (selection num-lines limit)
1586
1587   (decf limit 2)
1588   (setq company-tooltip-offset
1589         (max (min selection company-tooltip-offset)
1590              (- selection -1 limit)))
1591
1592   (when (<= company-tooltip-offset 1)
1593     (incf limit)
1594     (setq company-tooltip-offset 0))
1595
1596   (when (>= company-tooltip-offset (- num-lines limit 1))
1597     (incf limit)
1598     (when (= selection (1- num-lines))
1599       (decf company-tooltip-offset)
1600       (when (<= company-tooltip-offset 1)
1601         (setq company-tooltip-offset 0)
1602         (incf limit))))
1603
1604   limit)
1605
1606 ;;; propertize
1607
1608 (defsubst company-round-tab (arg)
1609   (* (/ (+ arg tab-width) tab-width) tab-width))
1610
1611 (defun company-untabify (str)
1612   (let* ((pieces (split-string str "\t"))
1613          (copy pieces))
1614     (while (cdr copy)
1615       (setcar copy (company-safe-substring
1616                     (car copy) 0 (company-round-tab (string-width (car copy)))))
1617       (pop copy))
1618     (apply 'concat pieces)))
1619
1620 (defun company-fill-propertize (line width selected)
1621   (setq line (company-safe-substring line 0 width))
1622   (add-text-properties 0 width '(face company-tooltip
1623                                  mouse-face company-tooltip-mouse)
1624                        line)
1625   (add-text-properties 0 (length company-common)
1626                        '(face company-tooltip-common
1627                          mouse-face company-tooltip-mouse)
1628                        line)
1629   (when selected
1630     (if (and company-search-string
1631              (string-match (regexp-quote company-search-string) line
1632                            (length company-prefix)))
1633         (progn
1634           (add-text-properties (match-beginning 0) (match-end 0)
1635                                '(face company-tooltip-selection)
1636                                line)
1637           (when (< (match-beginning 0) (length company-common))
1638             (add-text-properties (match-beginning 0) (length company-common)
1639                                  '(face company-tooltip-common-selection)
1640                                  line)))
1641       (add-text-properties 0 width '(face company-tooltip-selection
1642                                           mouse-face company-tooltip-selection)
1643                            line)
1644       (add-text-properties 0 (length company-common)
1645                            '(face company-tooltip-common-selection
1646                              mouse-face company-tooltip-selection)
1647                            line)))
1648   line)
1649
1650 ;;; replace
1651
1652 (defun company-buffer-lines (beg end)
1653   (goto-char beg)
1654   (let (lines)
1655     (while (< (point) end)
1656       (let ((bol (point)))
1657         ;; A visual line can contain several physical lines (e.g. with outline's
1658         ;; folding overlay).  Take only the first one.
1659         (re-search-forward "$")
1660         (push (buffer-substring bol (min end (point))) lines))
1661       (vertical-motion 1))
1662     (nreverse lines)))
1663
1664 (defsubst company-modify-line (old new offset)
1665   (concat (company-safe-substring old 0 offset)
1666           new
1667           (company-safe-substring old (+ offset (length new)))))
1668
1669 (defsubst company--length-limit (lst limit)
1670   (if (nthcdr limit lst)
1671       limit
1672     (length lst)))
1673
1674 (defun company--replacement-string (lines old column nl &optional align-top)
1675
1676   (let ((width (length (car lines))))
1677     (when (> width (- (window-width) column))
1678       (setq column (max 0 (- (window-width) width)))))
1679
1680   (let (new)
1681     (when align-top
1682       ;; untouched lines first
1683       (dotimes (i (- (length old) (length lines)))
1684         (push (pop old) new)))
1685     ;; length into old lines.
1686     (while old
1687       (push (company-modify-line (pop old) (pop lines) column) new))
1688     ;; Append whole new lines.
1689     (while lines
1690       (push (concat (company-space-string column) (pop lines)) new))
1691
1692     (let ((str (concat (when nl "\n")
1693                        (mapconcat 'identity (nreverse new) "\n")
1694                        "\n")))
1695       (font-lock-append-text-property 0 (length str) 'face 'default str)
1696       str)))
1697
1698 (defun company--create-lines (selection limit)
1699
1700   (let ((len company-candidates-length)
1701         (numbered 99999)
1702         lines
1703         width
1704         lines-copy
1705         previous
1706         remainder
1707         new)
1708
1709     ;; Scroll to offset.
1710     (setq limit (company-pseudo-tooltip-update-offset selection len limit))
1711
1712     (when (> company-tooltip-offset 0)
1713       (setq previous (format "...(%d)" company-tooltip-offset)))
1714
1715     (setq remainder (- len limit company-tooltip-offset)
1716           remainder (when (> remainder 0)
1717                       (setq remainder (format "...(%d)" remainder))))
1718
1719     (decf selection company-tooltip-offset)
1720     (setq width (max (length previous) (length remainder))
1721           lines (nthcdr company-tooltip-offset company-candidates)
1722           len (min limit len)
1723           lines-copy lines)
1724
1725     (dotimes (i len)
1726       (setq width (max (length (pop lines-copy)) width)))
1727     (setq width (min width (window-width)))
1728
1729     (setq lines-copy lines)
1730
1731     ;; number can make tooltip too long
1732     (when company-show-numbers
1733       (setq numbered company-tooltip-offset))
1734
1735     (when previous
1736       (push (propertize (company-safe-substring previous 0 width)
1737                         'face 'company-tooltip)
1738             new))
1739
1740     (dotimes (i len)
1741       (push (company-fill-propertize
1742              (if (>= numbered 10)
1743                  (company-reformat (pop lines))
1744                (incf numbered)
1745                (format "%s %d"
1746                        (company-safe-substring (company-reformat (pop lines))
1747                                                0 (- width 2))
1748                        (mod numbered 10)))
1749              width (equal i selection))
1750             new))
1751
1752     (when remainder
1753       (push (propertize (company-safe-substring remainder 0 width)
1754                         'face 'company-tooltip)
1755             new))
1756
1757     (setq lines (nreverse new))))
1758
1759 ;; show
1760
1761 (defsubst company--window-inner-height ()
1762   (let ((edges (window-inside-edges (selected-window))))
1763     (- (nth 3 edges) (nth 1 edges))))
1764
1765 (defsubst company--pseudo-tooltip-height ()
1766   "Calculate the appropriate tooltip height.
1767 Returns a negative number if the tooltip should be displayed above point."
1768   (let* ((lines (company--row))
1769          (below (- (company--window-inner-height) 1 lines)))
1770     (if (and (< below (min company-tooltip-minimum company-candidates-length))
1771              (> lines below))
1772         (- (max 3 (min company-tooltip-limit lines)))
1773       (max 3 (min company-tooltip-limit below)))))
1774
1775 (defun company-pseudo-tooltip-show (row column selection)
1776   (company-pseudo-tooltip-hide)
1777   (save-excursion
1778
1779     (move-to-column 0)
1780
1781     (let* ((height (company--pseudo-tooltip-height))
1782            above)
1783
1784       (when (and header-line-format
1785                  (version< "24" emacs-version))
1786         (decf row))
1787
1788       (when (< height 0)
1789         (setq row (+ row height -1)
1790               above t))
1791
1792       (let* ((nl (< (move-to-window-line row) row))
1793              (beg (point))
1794              (end (save-excursion
1795                     (move-to-window-line (+ row (abs height)))
1796                     (point)))
1797              (ov (make-overlay beg end))
1798              (args (list (mapcar 'company-untabify
1799                                  (company-buffer-lines beg end))
1800                          column nl above)))
1801
1802         (setq company-pseudo-tooltip-overlay ov)
1803         (overlay-put ov 'company-replacement-args args)
1804
1805         (let ((lines (company--create-lines selection (abs height))))
1806           (overlay-put ov 'company-before
1807                        (apply 'company--replacement-string lines args))
1808           (overlay-put ov 'company-width (string-width (car lines))))
1809
1810         (overlay-put ov 'company-column column)
1811         (overlay-put ov 'company-height height)))))
1812
1813 (defun company-pseudo-tooltip-show-at-point (pos)
1814   (let ((col-row (company--col-row pos)))
1815     (when col-row
1816       (company-pseudo-tooltip-show (1+ (cdr col-row)) (car col-row)
1817                                    company-selection))))
1818
1819 (defun company-pseudo-tooltip-edit (lines selection)
1820   (let ((height (overlay-get company-pseudo-tooltip-overlay 'company-height)))
1821     (overlay-put company-pseudo-tooltip-overlay 'company-before
1822                  (apply 'company--replacement-string
1823                         (company--create-lines selection (abs height))
1824                         (overlay-get company-pseudo-tooltip-overlay
1825                                      'company-replacement-args)))))
1826
1827 (defun company-pseudo-tooltip-hide ()
1828   (when company-pseudo-tooltip-overlay
1829     (delete-overlay company-pseudo-tooltip-overlay)
1830     (setq company-pseudo-tooltip-overlay nil)))
1831
1832 (defun company-pseudo-tooltip-hide-temporarily ()
1833   (when (overlayp company-pseudo-tooltip-overlay)
1834     (overlay-put company-pseudo-tooltip-overlay 'invisible nil)
1835     (overlay-put company-pseudo-tooltip-overlay 'before-string nil)))
1836
1837 (defun company-pseudo-tooltip-unhide ()
1838   (when company-pseudo-tooltip-overlay
1839     (overlay-put company-pseudo-tooltip-overlay 'invisible t)
1840     ;; Beat outline's folding overlays, at least.
1841     (overlay-put company-pseudo-tooltip-overlay 'priority 1)
1842     (overlay-put company-pseudo-tooltip-overlay 'before-string
1843                  (overlay-get company-pseudo-tooltip-overlay 'company-before))
1844     (overlay-put company-pseudo-tooltip-overlay 'window (selected-window))))
1845
1846 (defun company-pseudo-tooltip-guard ()
1847   (buffer-substring-no-properties
1848    (point) (overlay-start company-pseudo-tooltip-overlay)))
1849
1850 (defun company-pseudo-tooltip-frontend (command)
1851   "`company-mode' front-end similar to a tooltip but based on overlays."
1852   (case command
1853     (pre-command (company-pseudo-tooltip-hide-temporarily))
1854     (post-command
1855      (let ((old-height (if (overlayp company-pseudo-tooltip-overlay)
1856                            (overlay-get company-pseudo-tooltip-overlay
1857                                         'company-height)
1858                          0))
1859            (new-height (company--pseudo-tooltip-height)))
1860        (unless (and (>= (* old-height new-height) 0)
1861                     (>= (abs old-height) (abs new-height))
1862                     (equal (company-pseudo-tooltip-guard)
1863                            (overlay-get company-pseudo-tooltip-overlay
1864                                         'company-guard)))
1865          ;; Redraw needed.
1866          (company-pseudo-tooltip-show-at-point (- (point)
1867                                                   (length company-prefix)))
1868          (overlay-put company-pseudo-tooltip-overlay
1869                       'company-guard (company-pseudo-tooltip-guard))))
1870      (company-pseudo-tooltip-unhide))
1871     (hide (company-pseudo-tooltip-hide)
1872           (setq company-tooltip-offset 0))
1873     (update (when (overlayp company-pseudo-tooltip-overlay)
1874               (company-pseudo-tooltip-edit company-candidates
1875                                            company-selection)))))
1876
1877 (defun company-pseudo-tooltip-unless-just-one-frontend (command)
1878   "`company-pseudo-tooltip-frontend', but not shown for single candidates."
1879   (unless (and (eq command 'post-command)
1880                (not (cdr company-candidates)))
1881     (company-pseudo-tooltip-frontend command)))
1882
1883 ;;; overlay ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1884
1885 (defvar company-preview-overlay nil)
1886 (make-variable-buffer-local 'company-preview-overlay)
1887
1888 (defun company-preview-show-at-point (pos)
1889   (company-preview-hide)
1890
1891   (setq company-preview-overlay (make-overlay pos pos))
1892
1893   (let ((completion(nth company-selection company-candidates)))
1894     (setq completion (propertize completion 'face 'company-preview))
1895     (add-text-properties 0 (length company-common)
1896                          '(face company-preview-common) completion)
1897
1898     ;; Add search string
1899     (and company-search-string
1900          (string-match (regexp-quote company-search-string) completion)
1901          (add-text-properties (match-beginning 0)
1902                               (match-end 0)
1903                               '(face company-preview-search)
1904                               completion))
1905
1906     (setq completion (company-strip-prefix completion))
1907
1908     (and (equal pos (point))
1909          (not (equal completion ""))
1910          (add-text-properties 0 1 '(cursor t) completion))
1911
1912     (overlay-put company-preview-overlay 'after-string completion)
1913     (overlay-put company-preview-overlay 'window (selected-window))))
1914
1915 (defun company-preview-hide ()
1916   (when company-preview-overlay
1917     (delete-overlay company-preview-overlay)
1918     (setq company-preview-overlay nil)))
1919
1920 (defun company-preview-frontend (command)
1921   "`company-mode' front-end showing the selection as if it had been inserted."
1922   (case command
1923     (pre-command (company-preview-hide))
1924     (post-command (company-preview-show-at-point (point)))
1925     (hide (company-preview-hide))))
1926
1927 (defun company-preview-if-just-one-frontend (command)
1928   "`company-preview-frontend', but only shown for single candidates."
1929   (unless (and (eq command 'post-command)
1930                (cdr company-candidates))
1931     (company-preview-frontend command)))
1932
1933 ;;; echo ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1934
1935 (defvar company-echo-last-msg nil)
1936 (make-variable-buffer-local 'company-echo-last-msg)
1937
1938 (defvar company-echo-timer nil)
1939
1940 (defvar company-echo-delay .01)
1941
1942 (defun company-echo-show (&optional getter)
1943   (when getter
1944     (setq company-echo-last-msg (funcall getter)))
1945   (let ((message-log-max nil))
1946     (if company-echo-last-msg
1947         (message "%s" company-echo-last-msg)
1948       (message ""))))
1949
1950 (defsubst company-echo-show-soon (&optional getter)
1951   (when company-echo-timer
1952     (cancel-timer company-echo-timer))
1953   (setq company-echo-timer (run-with-timer 0 nil 'company-echo-show getter)))
1954
1955 (defsubst company-echo-show-when-idle (&optional getter)
1956   (when (sit-for .01)
1957     (company-echo-show getter)))
1958
1959 (defsubst company-echo-show-when-not-busy (&optional getter)
1960   "Run `company-echo-show' with arg GETTER once Emacs isn't busy."
1961   (when (sit-for company-echo-delay)
1962     (company-echo-show getter)))
1963
1964 (defun company-echo-format ()
1965
1966   (let ((limit (window-width (minibuffer-window)))
1967         (len -1)
1968         ;; Roll to selection.
1969         (candidates (nthcdr company-selection company-candidates))
1970         (i (if company-show-numbers company-selection 99999))
1971         comp msg)
1972
1973     (while candidates
1974       (setq comp (company-reformat (pop candidates))
1975             len (+ len 1 (length comp)))
1976       (if (< i 10)
1977           ;; Add number.
1978           (progn
1979             (setq comp (propertize (format "%d: %s" i comp)
1980                                    'face 'company-echo))
1981             (incf len 3)
1982             (incf i)
1983             (add-text-properties 3 (+ 3 (length company-common))
1984                                  '(face company-echo-common) comp))
1985         (setq comp (propertize comp 'face 'company-echo))
1986         (add-text-properties 0 (length company-common)
1987                              '(face company-echo-common) comp))
1988       (if (>= len limit)
1989           (setq candidates nil)
1990         (push comp msg)))
1991
1992     (mapconcat 'identity (nreverse msg) " ")))
1993
1994 (defun company-echo-strip-common-format ()
1995
1996   (let ((limit (window-width (minibuffer-window)))
1997         (len (+ (length company-prefix) 2))
1998         ;; Roll to selection.
1999         (candidates (nthcdr company-selection company-candidates))
2000         (i (if company-show-numbers company-selection 99999))
2001         msg comp)
2002
2003     (while candidates
2004       (setq comp (company-strip-prefix (pop candidates))
2005             len (+ len 2 (length comp)))
2006       (when (< i 10)
2007         ;; Add number.
2008         (setq comp (format "%s (%d)" comp i))
2009         (incf len 4)
2010         (incf i))
2011       (if (>= len limit)
2012           (setq candidates nil)
2013         (push (propertize comp 'face 'company-echo) msg)))
2014
2015     (concat (propertize company-prefix 'face 'company-echo-common) "{"
2016             (mapconcat 'identity (nreverse msg) ", ")
2017             "}")))
2018
2019 (defun company-echo-hide ()
2020   (unless (equal company-echo-last-msg "")
2021     (setq company-echo-last-msg "")
2022     (company-echo-show)))
2023
2024 (defun company-echo-frontend (command)
2025   "`company-mode' front-end showing the candidates in the echo area."
2026   (case command
2027     (post-command (company-echo-show-soon 'company-echo-format))
2028     (hide (company-echo-hide))))
2029
2030 (defun company-echo-strip-common-frontend (command)
2031   "`company-mode' front-end showing the candidates in the echo area."
2032   (case command
2033     (post-command (company-echo-show-soon 'company-echo-strip-common-format))
2034     (hide (company-echo-hide))))
2035
2036 (defun company-echo-metadata-frontend (command)
2037   "`company-mode' front-end showing the documentation in the echo area."
2038   (case command
2039     (post-command (company-echo-show-when-idle 'company-fetch-metadata))
2040     (hide (company-echo-hide))))
2041
2042 (provide 'company)
2043 ;;; company.el ends here