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

   1 ;;; company.el --- extensible inline text completion mechanism
   2 ;;
   3 ;; Copyright (C) 2009 Nikolaj Schumacher
   4 ;;
   5 ;; Author: Nikolaj Schumacher <bugs * nschum de>
   6 ;; Version:
   7 ;; Keywords: abbrev, convenience, matchis
   8 ;; URL: http://nschum.de/src/emacs/company/
   9 ;; Compatibility: GNU Emacs 23.x
  10 ;;
  11 ;; This file is NOT part of GNU Emacs.
  12 ;;
  13 ;; This program is free software; you can redistribute it and/or
  14 ;; modify it under the terms of the GNU General Public License
  15 ;; as published by the Free Software Foundation; either version 2
  16 ;; of the License, or (at your option) any later version.
  17 ;;
  18 ;; This program is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22 ;;
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25 ;;
  26 ;;; Commentary:
  27 ;;
  28 ;;; Change Log:
  29 ;;
  30 ;;    Initial release.
  31 ;;
  32 ;;; Code:
  33
  34 (eval-when-compile (require 'cl))
  35
  36 (add-to-list 'debug-ignored-errors
  37              "^Pseudo tooltip frontend cannot be used twice$")
  38 (add-to-list 'debug-ignored-errors "^Preview frontend cannot be used twice$")
  39 (add-to-list 'debug-ignored-errors "^Echo area cannot be used twice$")
  40 (add-to-list 'debug-ignored-errors "^No documentation available$")
  41
  42 (defgroup company nil
  43   ""
  44   :group 'abbrev
  45   :group 'convenience
  46   :group 'maching)
  47
  48 (defface company-tooltip
  49   '((t :background "yellow"
  50        :foreground "black"))
  51   "*"
  52   :group 'company)
  53
  54 (defface company-tooltip-selection
  55   '((t :background "orange1"
  56        :foreground "black"))
  57   "*"
  58   :group 'company)
  59
  60 (defface company-tooltip-common
  61   '((t :inherit company-tooltip
  62        :foreground "red"))
  63   "*"
  64   :group 'company)
  65
  66 (defface company-tooltip-common-selection
  67   '((t :inherit company-tooltip-selection
  68        :foreground "red"))
  69   "*"
  70   :group 'company)
  71
  72 (defcustom company-tooltip-limit 10
  73   "*"
  74   :group 'company
  75   :type 'integer)
  76
  77 (defface company-preview
  78   '((t :background "blue4"
  79        :foreground "wheat"))
  80   "*"
  81   :group 'company)
  82
  83 (defface company-preview-common
  84   '((t :inherit company-preview
  85        :foreground "red"))
  86   "*"
  87   :group 'company)
  88
  89 (defface company-echo nil
  90   "*"
  91   :group 'company)
  92
  93 (defface company-echo-common
  94   '((((background dark)) (:foreground "firebrick1"))
  95     (((background light)) (:background "firebrick4")))
  96   "*"
  97   :group 'company)
  98
  99 (defun company-frontends-set (variable value)
 100   ;; uniquify
 101   (let ((remainder value))
 102     (setcdr remainder (delq (car remainder) (cdr remainder))))
 103   (and (memq 'company-pseudo-tooltip-unless-just-one-frontend value)
 104        (memq 'company-pseudo-tooltip-frontend value)
 105        (error "Pseudo tooltip frontend cannot be used twice"))
 106   (and (memq 'company-preview-if-just-one-frontend value)
 107        (memq 'company-preview-frontend value)
 108        (error "Preview frontend cannot be used twice"))
 109   (and (memq 'company-echo value)
 110        (memq 'company-echo-metadata-frontend value)
 111        (error "Echo area cannot be used twice"))
 112   ;; preview must come last
 113   (dolist (f '(company-preview-if-just-one-frontend company-preview-frontend))
 114     (when (memq f value)
 115       (setq value (append (delq f value) (list f)))))
 116   (set variable value))
 117
 118 (defcustom company-frontends '(company-pseudo-tooltip-unless-just-one-frontend
 119                                company-preview-if-just-one-frontend
 120                                company-echo-metadata-frontend)
 121   "*"
 122   :set 'company-frontends-set
 123   :group 'company
 124   :type '(repeat (choice (const :tag "echo" company-echo-frontend)
 125                          (const :tag "pseudo tooltip"
 126                                 company-pseudo-tooltip-frontend)
 127                          (const :tag "pseudo tooltip, multiple only"
 128                                 company-pseudo-tooltip-unless-just-one-frontend)
 129                          (const :tag "preview" company-preview-frontend)
 130                          (const :tag "preview, unique only"
 131                                 company-preview-if-just-one-frontend)
 132                          (function :tag "custom function" nil))))
 133
 134 (defcustom company-backends '(company-elisp company-nxml company-css
 135                               company-semantic company-oddmuse
 136                               company-files company-dabbrev)
 137   "*"
 138   :group 'company
 139   :type '(repeat (function :tag "function" nil)))
 140
 141 (defcustom company-minimum-prefix-length 3
 142   "*"
 143   :group 'company
 144   :type '(integer :tag "prefix length"))
 145
 146 (defvar company-timer nil)
 147
 148 (defun company-timer-set (variable value)
 149   (set variable value)
 150   (when company-timer (cancel-timer company-timer))
 151   (when (numberp value)
 152     (setq company-timer (run-with-idle-timer value t 'company-idle-begin))))
 153
 154 (defcustom company-idle-delay .7
 155   "*"
 156   :set 'company-timer-set
 157   :group 'company
 158   :type '(choice (const :tag "never (nil)" nil)
 159                  (const :tag "immediate (t)" t)
 160                  (number :tag "seconds")))
 161
 162 ;;; mode ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 163
 164 (defvar company-mode-map (make-sparse-keymap))
 165
 166 (defvar company-active-map
 167   (let ((keymap (make-sparse-keymap)))
 168     (define-key keymap (kbd "M-n") 'company-select-next)
 169     (define-key keymap (kbd "M-p") 'company-select-previous)
 170     (define-key keymap "\C-m" 'company-complete-selection)
 171     (define-key keymap "\t" 'company-complete-common)
 172     (define-key keymap (kbd "<f1>") 'company-show-doc-buffer)
 173     (define-key keymap "\C-s" 'company-search-candidates)
 174     keymap))
 175
 176 ;;;###autoload
 177 (define-minor-mode company-mode
 178   ""
 179   nil " comp" company-mode-map
 180   (if company-mode
 181       (progn
 182         (add-hook 'pre-command-hook 'company-pre-command nil t)
 183         (add-hook 'post-command-hook 'company-post-command nil t)
 184         (company-timer-set 'company-idle-delay
 185                            company-idle-delay))
 186     (remove-hook 'pre-command-hook 'company-pre-command t)
 187     (remove-hook 'post-command-hook 'company-post-command t)
 188     (company-cancel)
 189     (kill-local-variable 'company-point)))
 190
 191 ;;; keymaps ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 192
 193 (defvar company-overriding-keymap-bound nil)
 194 (make-variable-buffer-local 'company-overriding-keymap-bound)
 195
 196 (defvar company-old-keymap nil)
 197 (make-variable-buffer-local 'company-old-keymap)
 198
 199 (defvar company-my-keymap nil)
 200 (make-variable-buffer-local 'company-my-keymap)
 201
 202 (defsubst company-enable-overriding-keymap (keymap)
 203   (setq company-my-keymap keymap)
 204   (when company-overriding-keymap-bound
 205     (company-uninstall-map)))
 206
 207 (defun company-install-map ()
 208   (unless (or company-overriding-keymap-bound
 209               (null company-my-keymap))
 210     (setq company-old-keymap overriding-terminal-local-map
 211           overriding-terminal-local-map company-my-keymap
 212           company-overriding-keymap-bound t)))
 213
 214 (defun company-uninstall-map ()
 215   (when (and company-overriding-keymap-bound
 216              (eq overriding-terminal-local-map company-my-keymap))
 217     (setq overriding-terminal-local-map company-old-keymap
 218           company-overriding-keymap-bound nil)))
 219
 220 ;; Hack:
 221 ;; Emacs calculates the active keymaps before reading the event.  That means we
 222 ;; cannot change the keymap from a timer.  So we send a bogus command.
 223 (defun company-ignore ()
 224   (interactive))
 225
 226 (global-set-key '[31415926] 'company-ignore)
 227
 228 (defun company-input-noop ()
 229   (push 31415926 unread-command-events))
 230
 231 ;;; backends ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 232
 233 (defun company-grab (regexp &optional expression)
 234   (when (looking-back regexp)
 235     (or (match-string-no-properties (or expression 0)) "")))
 236
 237 (defun company-in-string-or-comment (&optional point)
 238   (let ((pos (syntax-ppss)))
 239     (or (nth 3 pos) (nth 4 pos) (nth 7 pos))))
 240
 241 ;;; completion mechanism ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 242
 243 (defvar company-backend nil)
 244 (make-variable-buffer-local 'company-backend)
 245
 246 (defvar company-prefix nil)
 247 (make-variable-buffer-local 'company-prefix)
 248
 249 (defvar company-candidates nil)
 250 (make-variable-buffer-local 'company-candidates)
 251
 252 (defvar company-candidates-cache nil)
 253 (make-variable-buffer-local 'company-candidates-cache)
 254
 255 (defvar company-candidates-predicate nil)
 256 (make-variable-buffer-local 'company-candidates-predicate)
 257
 258 (defvar company-common nil)
 259 (make-variable-buffer-local 'company-common)
 260
 261 (defvar company-selection 0)
 262 (make-variable-buffer-local 'company-selection)
 263
 264 (defvar company-selection-changed nil)
 265 (make-variable-buffer-local 'company-selection-changed)
 266
 267 (defvar company-point nil)
 268 (make-variable-buffer-local 'company-point)
 269
 270 (defvar company-disabled-backends nil)
 271
 272 (defsubst company-strip-prefix (str)
 273   (substring str (length company-prefix)))
 274
 275 (defsubst company-reformat (candidate)
 276   ;; company-ispell needs this, because the results are always lower-case
 277   ;; It's mory efficient to fix it only when they are displayed.
 278   (concat company-prefix (substring candidate (length company-prefix))))
 279
 280 (defsubst company-should-complete (prefix)
 281   (and (eq company-idle-delay t)
 282        (>= (length prefix) company-minimum-prefix-length)))
 283
 284 (defsubst company-call-frontends (command)
 285   (dolist (frontend company-frontends)
 286     (funcall frontend command)))
 287
 288 (defsubst company-set-selection (selection &optional force-update)
 289   (setq selection (max 0 (min (1- (length company-candidates)) selection)))
 290   (when (or force-update (not (equal selection company-selection)))
 291     (setq company-selection selection
 292           company-selection-changed t)
 293     (company-call-frontends 'update)))
 294
 295 (defun company-apply-predicate (candidates predicate)
 296   (let (new)
 297     (dolist (c candidates)
 298       (when (funcall predicate c)
 299         (push c new)))
 300     (nreverse new)))
 301
 302 (defsubst company-calculate-candidates (prefix)
 303   (or (setq company-candidates (cdr (assoc prefix company-candidates-cache)))
 304       (let ((len (length prefix))
 305             (completion-ignore-case (funcall company-backend 'ignore-case))
 306             prev)
 307         (dotimes (i len)
 308           (when (setq prev (cdr (assoc (substring prefix 0 (- len i))
 309                                        company-candidates-cache)))
 310             (setq company-candidates (all-completions prefix prev))
 311             (return t))))
 312       (progn
 313         (setq company-candidates (funcall company-backend 'candidates prefix))
 314         (when company-candidates-predicate
 315           (setq company-candidates
 316                 (company-apply-predicate company-candidates
 317                                          company-candidates-predicate)))
 318         (unless (funcall company-backend 'sorted)
 319           (setq company-candidates (sort company-candidates 'string<)))))
 320   (unless (assoc prefix company-candidates-cache)
 321     (push (cons prefix company-candidates) company-candidates-cache))
 322   (setq company-selection 0
 323         company-prefix prefix)
 324   (let ((completion-ignore-case (funcall company-backend 'ignore-case)))
 325     (setq company-common (try-completion company-prefix company-candidates)))
 326   (when (eq company-common t)
 327     (setq company-candidates nil))
 328   company-candidates)
 329
 330 (defun company-idle-begin ()
 331   (and company-mode
 332        (not company-candidates)
 333        (not (equal (point) company-point))
 334        (let ((company-idle-delay t))
 335          (company-begin)
 336          (when company-candidates
 337            (company-input-noop)
 338            (company-post-command)))))
 339
 340 (defun company-manual-begin ()
 341   (and company-mode
 342        (not company-candidates)
 343        (let ((company-idle-delay t)
 344              (company-minimum-prefix-length 0))
 345          (company-begin)))
 346   ;; Return non-nil if active.
 347   company-candidates)
 348
 349 (defun company-continue ()
 350   (when company-candidates
 351     (when (funcall company-backend 'no-cache)
 352       ;; Don't complete existing candidates, fetch new ones.
 353       (setq company-candidates-cache nil))
 354     (let ((new-prefix (funcall company-backend 'prefix)))
 355       (unless (and (= (- (point) (length new-prefix))
 356                       (- company-point (length company-prefix)))
 357                    (or (equal company-prefix new-prefix)
 358                        (company-calculate-candidates new-prefix)))
 359         (setq company-candidates nil)))))
 360
 361 (defun company-begin ()
 362   (if (or buffer-read-only overriding-terminal-local-map overriding-local-map)
 363       ;; Don't complete in these cases.
 364       (setq company-candidates nil)
 365     (company-continue)
 366     (unless company-candidates
 367       (let (prefix)
 368         (dolist (backend company-backends)
 369           (unless (fboundp backend)
 370             (ignore-errors (require backend nil t)))
 371           (if (fboundp backend)
 372               (when (setq prefix (funcall backend 'prefix))
 373                 (when (company-should-complete prefix)
 374                   (setq company-backend backend)
 375                   (company-calculate-candidates prefix))
 376                 (return prefix))
 377             (unless (memq backend company-disabled-backends)
 378               (push backend company-disabled-backends)
 379               (message "Company back-end '%s' could not be initialized"
 380                        backend)))))))
 381   (if company-candidates
 382       (progn
 383         (setq company-point (point))
 384         (company-enable-overriding-keymap company-active-map)
 385         (company-call-frontends 'update))
 386     (company-cancel)))
 387
 388 (defun company-cancel ()
 389   (setq company-backend nil
 390         company-prefix nil
 391         company-candidates nil
 392         company-candidates-cache nil
 393         company-candidates-predicate nil
 394         company-common nil
 395         company-selection 0
 396         company-selection-changed nil
 397         company-point nil)
 398   (company-search-mode 0)
 399   (company-call-frontends 'hide)
 400   (company-enable-overriding-keymap nil))
 401
 402 (defun company-abort ()
 403   (company-cancel)
 404   ;; Don't start again, unless started manually.
 405   (setq company-point (point)))
 406
 407 (defun company-pre-command ()
 408   (unless (eq this-command 'company-show-doc-buffer)
 409     (condition-case err
 410         (when company-candidates
 411           (company-call-frontends 'pre-command))
 412       (error (message "Company: An error occurred in pre-command")
 413              (message "%s" (error-message-string err))
 414              (company-cancel))))
 415   (company-uninstall-map))
 416
 417 (defun company-post-command ()
 418   (unless (eq this-command 'company-show-doc-buffer)
 419     (condition-case err
 420         (progn
 421           (unless (equal (point) company-point)
 422             (company-begin))
 423           (when company-candidates
 424             (company-call-frontends 'post-command)))
 425       (error (message "Company: An error occurred in post-command")
 426              (message "%s" (error-message-string err))
 427              (company-cancel))))
 428   (company-install-map))
 429
 430 ;;; search ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 431
 432 (defvar company-search-string nil)
 433 (make-variable-buffer-local 'company-search-string)
 434
 435 (defvar company-search-lighter " Search: \"\"")
 436 (make-variable-buffer-local 'company-search-lighter)
 437
 438 (defvar company-search-old-map nil)
 439 (make-variable-buffer-local 'company-search-old-map)
 440
 441 (defvar company-search-old-selection 0)
 442 (make-variable-buffer-local 'company-search-old-selection)
 443
 444 (defun company-search (text lines)
 445   (let ((quoted (regexp-quote text))
 446         (i 0))
 447     (dolist (line lines)
 448       (when (string-match quoted line (length company-prefix))
 449         (return i))
 450       (incf i))))
 451
 452 (defun company-search-printing-char ()
 453   (interactive)
 454   (setq company-search-string
 455         (concat (or company-search-string "") (string last-command-event))
 456         company-search-lighter (concat " Search: \"" company-search-string
 457                                         "\""))
 458   (let ((pos (company-search company-search-string
 459                               (nthcdr company-selection company-candidates))))
 460     (if (null pos)
 461         (ding)
 462       (company-set-selection (+ company-selection pos) t))))
 463
 464 (defun company-search-repeat-forward ()
 465   (interactive)
 466   (let ((pos (company-search company-search-string
 467                               (cdr (nthcdr company-selection
 468                                            company-candidates)))))
 469     (if (null pos)
 470         (ding)
 471       (company-set-selection (+ company-selection pos 1) t))))
 472
 473 (defun company-search-repeat-backward ()
 474   (interactive)
 475   (let ((pos (company-search company-search-string
 476                               (nthcdr (- (length company-candidates)
 477                                          company-selection)
 478                                       (reverse company-candidates)))))
 479     (if (null pos)
 480         (ding)
 481       (company-set-selection (- company-selection pos 1) t))))
 482
 483 (defun company-search-kill-others ()
 484   (interactive)
 485   (let ((predicate `(lambda (candidate)
 486                       (string-match ,company-search-string candidate))))
 487     (company-cancel)
 488     (setq company-candidates-predicate predicate)
 489     (company-manual-begin)))
 490
 491 (defun company-search-abort ()
 492   (interactive)
 493   (company-set-selection company-search-old-selection t)
 494   (company-search-mode 0))
 495
 496 (defun company-search-other-char ()
 497   (interactive)
 498   (company-search-mode 0)
 499   (when last-input-event
 500     (clear-this-command-keys t)
 501     (setq unread-command-events (list last-input-event))))
 502
 503 (defvar company-search-map
 504   (let ((i 0)
 505         (keymap (make-keymap)))
 506     (set-char-table-range (nth 1 keymap) (cons #x100 (max-char))
 507                           'company-search-printing-char)
 508     (define-key keymap [t] 'company-search-other-char)
 509     (while (< i ?\s)
 510       (define-key keymap (make-string 1 i) 'company-search-other-char)
 511       (incf i))
 512     (while (< i 256)
 513       (define-key keymap (vector i) 'company-search-printing-char)
 514       (incf i))
 515     (let ((meta-map (make-sparse-keymap)))
 516       (define-key keymap (char-to-string meta-prefix-char) meta-map)
 517       (define-key keymap [escape] meta-map))
 518     (define-key keymap (vector meta-prefix-char t) 'company-search-other-char)
 519     (define-key keymap "\e\e\e" 'company-search-other-char)
 520     (define-key keymap  [escape escape escape] 'company-search-other-char)
 521
 522     (define-key keymap "\C-g" 'company-search-abort)
 523     (define-key keymap "\C-s" 'company-search-repeat-forward)
 524     (define-key keymap "\C-r" 'company-search-repeat-backward)
 525     (define-key keymap "\C-o" 'company-search-kill-others)
 526     keymap))
 527
 528 (define-minor-mode company-search-mode
 529   ""
 530   nil company-search-lighter nil
 531   (if company-search-mode
 532       (if (company-manual-begin)
 533           (progn
 534             (setq company-search-old-selection company-selection)
 535             (company-enable-overriding-keymap company-search-map)
 536             (company-call-frontends 'update))
 537         (setq company-search-mode nil))
 538     (kill-local-variable 'company-search-string)
 539     (kill-local-variable 'company-search-lighter)
 540     (kill-local-variable 'company-search-old-selection)
 541     (company-enable-overriding-keymap company-active-map)))
 542
 543 (defun company-search-candidates ()
 544   (interactive)
 545   (company-search-mode 1))
 546
 547 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 548
 549 (defun company-select-next ()
 550   (interactive)
 551   (when (company-manual-begin)
 552     (company-set-selection (1+ company-selection))))
 553
 554 (defun company-select-previous ()
 555   (interactive)
 556   (when (company-manual-begin)
 557     (company-set-selection (1- company-selection))))
 558
 559 (defun company-complete-selection ()
 560   (interactive)
 561   (when (company-manual-begin)
 562     (insert (company-strip-prefix (nth company-selection company-candidates)))
 563     (company-abort)))
 564
 565 (defun company-complete-common ()
 566   (interactive)
 567   (when (company-manual-begin)
 568     (insert (company-strip-prefix company-common))))
 569
 570 (defun company-complete ()
 571   (interactive)
 572   (when (company-manual-begin)
 573     (if (or company-selection-changed
 574             (eq last-command 'company-complete-common))
 575         (call-interactively 'company-complete-selection)
 576       (call-interactively 'company-complete-common)
 577       (setq this-command 'company-complete-common))))
 578
 579 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 580
 581 (defconst company-space-strings-limit 100)
 582
 583 (defconst company-space-strings
 584   (let (lst)
 585     (dotimes (i company-space-strings-limit)
 586       (push (make-string (- company-space-strings-limit 1 i) ?\  ) lst))
 587     (apply 'vector lst)))
 588
 589 (defsubst company-space-string (len)
 590   (if (< len company-space-strings-limit)
 591       (aref company-space-strings len)
 592     (make-string len ?\ )))
 593
 594 (defsubst company-safe-substring (str from &optional to)
 595   (let ((len (length str)))
 596     (if (> from len)
 597         ""
 598       (if (and to (> to len))
 599           (concat (substring str from)
 600                   (company-space-string (- to len)))
 601         (substring str from to)))))
 602
 603 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 604
 605 (defvar company-last-metadata nil)
 606 (make-variable-buffer-local 'company-last-metadata)
 607
 608 (defun company-fetch-metadata ()
 609   (let ((selected (nth company-selection company-candidates)))
 610     (unless (equal selected (car company-last-metadata))
 611       (setq company-last-metadata
 612             (cons selected (funcall company-backend 'meta selected))))
 613     (cdr company-last-metadata)))
 614
 615 (defun company-doc-buffer (&optional string)
 616   (with-current-buffer (get-buffer-create "*Company meta-data*")
 617     (erase-buffer)
 618     (current-buffer)))
 619
 620 (defun company-show-doc-buffer ()
 621   (interactive)
 622   (when company-candidates
 623     (save-window-excursion
 624       (let* ((height (window-height))
 625              (row (cdr (posn-col-row (posn-at-point))))
 626              (selected (nth company-selection company-candidates))
 627              (buffer (funcall company-backend 'doc-buffer selected)))
 628         (if (not buffer)
 629             (error "No documentation available.")
 630           (display-buffer buffer)
 631           (and (< (window-height) height)
 632                (< (- (window-height) row 2) company-tooltip-limit)
 633                (recenter (- (window-height) row 2)))
 634           (read-event)
 635           (when last-input-event
 636             (clear-this-command-keys t)
 637             (setq unread-command-events (list last-input-event))))))))
 638
 639 ;;; pseudo-tooltip ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 640
 641 (defvar company-pseudo-tooltip-overlay nil)
 642 (make-variable-buffer-local 'company-pseudo-tooltip-overlay)
 643
 644 (defvar company-tooltip-offset 0)
 645 (make-variable-buffer-local 'company-tooltip-offset)
 646
 647 (defun company-pseudo-tooltip-update-offset (selection num-lines limit)
 648
 649   (decf limit 2)
 650   (setq company-tooltip-offset
 651         (max (min selection company-tooltip-offset)
 652              (- selection -1 limit)))
 653
 654   (when (<= company-tooltip-offset 1)
 655     (incf limit)
 656     (setq company-tooltip-offset 0))
 657
 658   (when (>= company-tooltip-offset (- num-lines limit 1))
 659     (incf limit)
 660     (when (= selection (1- num-lines))
 661       (decf company-tooltip-offset)
 662       (when (<= company-tooltip-offset 1)
 663         (setq company-tooltip-offset 0)
 664         (incf limit))))
 665
 666   limit)
 667
 668 ;;; propertize
 669
 670 (defun company-fill-propertize (line width selected)
 671   (setq line (company-safe-substring line 0 width))
 672   (add-text-properties 0 width (list 'face 'company-tooltip) line)
 673   (add-text-properties 0 (length company-common)
 674                        (list 'face 'company-tooltip-common) line)
 675   (when selected
 676     (if (and company-search-string
 677              (string-match (regexp-quote company-search-string) line
 678                            (length company-prefix)))
 679         (progn
 680           (add-text-properties (match-beginning 0) (match-end 0)
 681                                '(face company-tooltip-selection) line)
 682           (when (< (match-beginning 0) (length company-common))
 683             (add-text-properties (match-beginning 0) (length company-common)
 684                                  '(face company-tooltip-common-selection)
 685                                  line)))
 686       (add-text-properties 0 width '(face company-tooltip-selection) line)
 687       (add-text-properties 0 (length company-common)
 688                            (list 'face 'company-tooltip-common-selection)
 689                            line)))
 690   line)
 691
 692 ;;; replace
 693
 694 (defun company-buffer-lines (beg end)
 695   (goto-char beg)
 696   (let ((row (cdr (posn-col-row (posn-at-point))))
 697         lines)
 698     (while (and (equal (move-to-window-line (incf row)) row)
 699                 (<= (point) end))
 700       (push (buffer-substring beg (min end (1- (point)))) lines)
 701       (setq beg (point)))
 702     (unless (eq beg end)
 703       (push (buffer-substring beg end) lines))
 704     (nreverse lines)))
 705
 706 (defun company-modify-line (old new offset)
 707   (concat (company-safe-substring old 0 offset)
 708           new
 709           (company-safe-substring old (+ offset (length new)))))
 710
 711 (defun company-replacement-string (old lines column nl)
 712   (let (new)
 713     ;; Inject into old lines.
 714     (while old
 715       (push (company-modify-line (pop old) (pop lines) column) new))
 716     ;; Append whole new lines.
 717     (while lines
 718       (push (company-modify-line "" (pop lines) column) new))
 719     (concat (when nl "\n")
 720             (mapconcat 'identity (nreverse new) "\n")
 721             "\n")))
 722
 723 (defun company-create-lines (column lines selection limit)
 724
 725   (let ((len (length lines))
 726         width
 727         lines-copy
 728         previous
 729         remainder
 730         new)
 731
 732     ;; Scroll to offset.
 733     (setq limit (company-pseudo-tooltip-update-offset selection len limit))
 734
 735     (when (> company-tooltip-offset 0)
 736       (setq previous (format "...(%d)" company-tooltip-offset)))
 737
 738     (setq remainder (- len limit company-tooltip-offset)
 739           remainder (when (> remainder 0)
 740                       (setq remainder (format "...(%d)" remainder))))
 741
 742     (decf selection company-tooltip-offset)
 743     (setq width (min (length previous) (length remainder))
 744           lines (nthcdr company-tooltip-offset lines)
 745           len (min limit (length lines))
 746           lines-copy lines)
 747
 748     (dotimes (i len)
 749       (setq width (max (length (pop lines-copy)) width)))
 750     (setq width (min width (- (window-width) column)))
 751
 752     (when previous
 753       (push (propertize (company-safe-substring previous 0 width)
 754                         'face 'company-tooltip)
 755             new))
 756
 757     (dotimes (i len)
 758       (push (company-fill-propertize (company-reformat (pop lines))
 759                                      width (equal i selection))
 760             new))
 761
 762     (when remainder
 763       (push (propertize (company-safe-substring remainder 0 width)
 764                         'face 'company-tooltip)
 765             new))
 766
 767     (setq lines (nreverse new))))
 768
 769 ;; show
 770
 771 (defsubst company-pseudo-tooltip-height ()
 772   "Calculate the appropriate tooltip height."
 773   (max 3 (min company-tooltip-limit
 774               (- (window-height) (cdr (posn-col-row (posn-at-point))) 2))))
 775
 776 (defun company-pseudo-tooltip-show (row column lines selection)
 777   (company-pseudo-tooltip-hide)
 778   (unless lines (error "No text provided"))
 779   (save-excursion
 780
 781     (move-to-column 0)
 782
 783     (let* ((height (company-pseudo-tooltip-height))
 784            (lines (company-create-lines column lines selection height))
 785            (nl (< (move-to-window-line row) row))
 786            (beg (point))
 787            (end (save-excursion
 788                   (move-to-window-line (+ row height))
 789                   (point)))
 790            (old-string (company-buffer-lines beg end))
 791            str)
 792
 793       (setq company-pseudo-tooltip-overlay (make-overlay beg end))
 794
 795       (overlay-put company-pseudo-tooltip-overlay 'company-old old-string)
 796       (overlay-put company-pseudo-tooltip-overlay 'company-column column)
 797       (overlay-put company-pseudo-tooltip-overlay 'company-nl nl)
 798       (overlay-put company-pseudo-tooltip-overlay 'company-before
 799                    (company-replacement-string old-string lines column nl))
 800       (overlay-put company-pseudo-tooltip-overlay 'company-height height)
 801
 802       (overlay-put company-pseudo-tooltip-overlay 'window (selected-window)))))
 803
 804 (defun company-pseudo-tooltip-show-at-point (pos)
 805   (let ((col-row (posn-col-row (posn-at-point pos))))
 806     (company-pseudo-tooltip-show (1+ (cdr col-row)) (car col-row)
 807                                  company-candidates company-selection)))
 808
 809 (defun company-pseudo-tooltip-edit (lines selection)
 810   (let* ((old-string (overlay-get company-pseudo-tooltip-overlay 'company-old))
 811          (column (overlay-get company-pseudo-tooltip-overlay 'company-column))
 812          (nl (overlay-get company-pseudo-tooltip-overlay 'company-nl))
 813          (height (overlay-get company-pseudo-tooltip-overlay 'company-height))
 814          (lines (company-create-lines column lines selection height)))
 815     (overlay-put company-pseudo-tooltip-overlay 'company-before
 816                  (company-replacement-string old-string lines column nl))))
 817
 818 (defun company-pseudo-tooltip-hide ()
 819   (when company-pseudo-tooltip-overlay
 820     (delete-overlay company-pseudo-tooltip-overlay)
 821     (setq company-pseudo-tooltip-overlay nil)))
 822
 823 (defun company-pseudo-tooltip-hide-temporarily ()
 824   (when (overlayp company-pseudo-tooltip-overlay)
 825     (overlay-put company-pseudo-tooltip-overlay 'invisible nil)
 826     (overlay-put company-pseudo-tooltip-overlay 'before-string nil)))
 827
 828 (defun company-pseudo-tooltip-unhide ()
 829   (when company-pseudo-tooltip-overlay
 830     (overlay-put company-pseudo-tooltip-overlay 'invisible t)
 831     (overlay-put company-pseudo-tooltip-overlay 'before-string
 832                  (overlay-get company-pseudo-tooltip-overlay 'company-before))))
 833
 834 (defun company-pseudo-tooltip-frontend (command)
 835   (case command
 836     ('pre-command (company-pseudo-tooltip-hide-temporarily))
 837     ('post-command
 838      (unless (and (overlayp company-pseudo-tooltip-overlay)
 839                   (equal (overlay-get company-pseudo-tooltip-overlay
 840                                       'company-height)
 841                          (company-pseudo-tooltip-height)))
 842        ;; Redraw needed.
 843        (company-pseudo-tooltip-show-at-point (- (point)
 844                                                 (length company-prefix))))
 845      (company-pseudo-tooltip-unhide))
 846     ('hide (company-pseudo-tooltip-hide)
 847            (setq company-tooltip-offset 0))
 848     ('update (when (overlayp company-pseudo-tooltip-overlay)
 849                (company-pseudo-tooltip-edit company-candidates
 850                                             company-selection)))))
 851
 852 (defun company-pseudo-tooltip-unless-just-one-frontend (command)
 853   (unless (and (eq command 'post-command)
 854                (not (cdr company-candidates)))
 855     (company-pseudo-tooltip-frontend command)))
 856
 857 ;;; overlay ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 858
 859 (defvar company-preview-overlay nil)
 860 (make-variable-buffer-local 'company-preview-overlay)
 861
 862 (defun company-preview-show-at-point (pos)
 863   (company-preview-hide)
 864
 865   (setq company-preview-overlay (make-overlay pos pos))
 866
 867   (let ((completion (company-strip-prefix (nth company-selection
 868                                                company-candidates))))
 869     (and (equal pos (point))
 870          (not (equal completion ""))
 871          (add-text-properties 0 1 '(cursor t) completion))
 872
 873     (setq completion (propertize completion 'face 'company-preview))
 874     (add-text-properties 0 (- (length company-common) (length company-prefix))
 875                          '(face company-preview-common) completion)
 876
 877     (overlay-put company-preview-overlay 'after-string completion)
 878     (overlay-put company-preview-overlay 'window (selected-window))))
 879
 880 (defun company-preview-hide ()
 881   (when company-preview-overlay
 882     (delete-overlay company-preview-overlay)
 883     (setq company-preview-overlay nil)))
 884
 885 (defun company-preview-frontend (command)
 886   (case command
 887     ('pre-command (company-preview-hide))
 888     ('post-command (company-preview-show-at-point (point)))
 889     ('hide (company-preview-hide))))
 890
 891 (defun company-preview-if-just-one-frontend (command)
 892   (unless (and (eq command 'post-command)
 893                (cdr company-candidates))
 894     (company-preview-frontend command)))
 895
 896 ;;; echo ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 897
 898 (defvar company-echo-last-msg nil)
 899 (make-variable-buffer-local 'company-echo-last-msg)
 900
 901 (defun company-echo-refresh ()
 902   (let ((message-log-max nil))
 903     (if company-echo-last-msg
 904         (message "%s" company-echo-last-msg)
 905       (message ""))))
 906
 907 (defun company-echo-show (candidates)
 908
 909   ;; Roll to selection.
 910   (setq candidates (nthcdr company-selection candidates))
 911
 912   (let ((limit (window-width (minibuffer-window)))
 913         (len -1)
 914         comp msg)
 915     (while candidates
 916       (setq comp (company-reformat (pop candidates))
 917             len (+ len 1 (length comp)))
 918       (if (>= len limit)
 919           (setq candidates nil)
 920         (setq comp (propertize comp 'face 'company-echo))
 921         (add-text-properties 0 (length company-common)
 922                              '(face company-echo-common) comp)
 923         (push comp msg)))
 924
 925     (setq company-echo-last-msg (mapconcat 'identity (nreverse msg) " "))
 926     (company-echo-refresh)))
 927
 928 (defun company-echo-frontend (command)
 929   (case command
 930     ('pre-command (company-echo-refresh))
 931     ('post-command (company-echo-show company-candidates))
 932     ('hide (setq company-echo-last-msg nil))))
 933
 934 (defun company-echo-metadata-frontend (command)
 935   (case command
 936     ('pre-command (company-echo-refresh))
 937     ('post-command (setq company-echo-last-msg (company-fetch-metadata))
 938                    (company-echo-refresh))
 939     ('hide (setq company-echo-last-msg nil))))
 940
 941
 942 (provide 'company)
 943 ;;; company.el ends here