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-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-common nil)
 256 (make-variable-buffer-local 'company-common)
 257
 258 (defvar company-selection 0)
 259 (make-variable-buffer-local 'company-selection)
 260
 261 (defvar company-selection-changed nil)
 262 (make-variable-buffer-local 'company-selection-changed)
 263
 264 (defvar company-point nil)
 265 (make-variable-buffer-local 'company-point)
 266
 267 (defvar company-disabled-backends nil)
 268
 269 (defsubst company-strip-prefix (str)
 270   (substring str (length company-prefix)))
 271
 272 (defsubst company-reformat (candidate)
 273   ;; company-ispell needs this, because the results are always lower-case
 274   ;; It's mory efficient to fix it only when they are displayed.
 275   (concat company-prefix (substring candidate (length company-prefix))))
 276
 277 (defsubst company-should-complete (prefix)
 278   (and (eq company-idle-delay t)
 279        (>= (length prefix) company-minimum-prefix-length)))
 280
 281 (defsubst company-call-frontends (command)
 282   (dolist (frontend company-frontends)
 283     (funcall frontend command)))
 284
 285 (defsubst company-set-selection (selection &optional force-update)
 286   (setq selection (max 0 (min (1- (length company-candidates)) selection)))
 287   (when (or force-update (not (equal selection company-selection)))
 288     (setq company-selection selection
 289           company-selection-changed t)
 290     (company-call-frontends 'update)))
 291
 292 (defsubst company-calculate-candidates (prefix)
 293   (or (setq company-candidates (cdr (assoc prefix company-candidates-cache)))
 294       (let ((len (length prefix))
 295             (completion-ignore-case (funcall company-backend 'ignore-case))
 296             prev)
 297         (dotimes (i len)
 298           (when (setq prev (cdr (assoc (substring prefix 0 (- len i))
 299                                        company-candidates-cache)))
 300             (setq company-candidates (all-completions prefix prev))
 301             (return t))))
 302       (progn
 303         (setq company-candidates (funcall company-backend 'candidates prefix))
 304         (unless (funcall company-backend 'sorted)
 305           (setq company-candidates (sort company-candidates 'string<)))))
 306   (unless (assoc prefix company-candidates-cache)
 307     (push (cons prefix company-candidates) company-candidates-cache))
 308   (setq company-selection 0
 309         company-prefix prefix)
 310   (let ((completion-ignore-case (funcall company-backend 'ignore-case)))
 311     (setq company-common (try-completion company-prefix company-candidates)))
 312   (when (eq company-common t)
 313     (setq company-candidates nil))
 314   company-candidates)
 315
 316 (defun company-idle-begin ()
 317   (and company-mode
 318        (not company-candidates)
 319        (not (equal (point) company-point))
 320        (let ((company-idle-delay t))
 321          (company-begin)
 322          (when company-candidates
 323            (company-input-noop)
 324            (company-post-command)))))
 325
 326 (defun company-manual-begin ()
 327   (and company-mode
 328        (not company-candidates)
 329        (let ((company-idle-delay t)
 330              (company-minimum-prefix-length 0))
 331          (company-begin)))
 332   ;; Return non-nil if active.
 333   company-candidates)
 334
 335 (defun company-continue ()
 336   (when company-candidates
 337     (let ((new-prefix (funcall company-backend 'prefix)))
 338       (unless (and (= (- (point) (length new-prefix))
 339                       (- company-point (length company-prefix)))
 340                    (or (equal company-prefix new-prefix)
 341                        (company-calculate-candidates new-prefix)))
 342         (setq company-candidates nil)))))
 343
 344 (defun company-begin ()
 345   (if (or buffer-read-only overriding-terminal-local-map overriding-local-map)
 346       ;; Don't complete in these cases.
 347       (setq company-candidates nil)
 348     (company-continue)
 349     (unless company-candidates
 350       (let (prefix)
 351         (dolist (backend company-backends)
 352           (unless (fboundp backend)
 353             (ignore-errors (require backend nil t)))
 354           (if (fboundp backend)
 355               (when (setq prefix (funcall backend 'prefix))
 356                 (when (company-should-complete prefix)
 357                   (setq company-backend backend)
 358                   (company-calculate-candidates prefix))
 359                 (return prefix))
 360             (unless (memq backend company-disabled-backends)
 361               (push backend company-disabled-backends)
 362               (message "Company back-end '%s' could not be initialized"
 363                        backend)))))))
 364   (if company-candidates
 365       (progn
 366         (setq company-point (point))
 367         (company-enable-overriding-keymap company-active-map)
 368         (company-call-frontends 'update))
 369     (company-cancel)))
 370
 371 (defun company-cancel ()
 372   (setq company-backend nil
 373         company-prefix nil
 374         company-candidates nil
 375         company-candidates-cache nil
 376         company-common nil
 377         company-selection 0
 378         company-selection-changed nil
 379         company-point nil)
 380   (company-search-mode 0)
 381   (company-call-frontends 'hide)
 382   (company-enable-overriding-keymap nil))
 383
 384 (defun company-abort ()
 385   (company-cancel)
 386   ;; Don't start again, unless started manually.
 387   (setq company-point (point)))
 388
 389 (defun company-pre-command ()
 390   (unless (eq this-command 'company-show-doc-buffer)
 391     (condition-case err
 392         (when company-candidates
 393           (company-call-frontends 'pre-command))
 394       (error (message "Company: An error occurred in pre-command")
 395              (message "%s" (error-message-string err))
 396              (company-cancel))))
 397   (company-uninstall-map))
 398
 399 (defun company-post-command ()
 400   (unless (eq this-command 'company-show-doc-buffer)
 401     (condition-case err
 402         (progn
 403           (unless (equal (point) company-point)
 404             (company-begin))
 405           (when company-candidates
 406             (company-call-frontends 'post-command)))
 407       (error (message "Company: An error occurred in post-command")
 408              (message "%s" (error-message-string err))
 409              (company-cancel))))
 410   (company-install-map))
 411
 412 ;;; search ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 413
 414 (defvar company-search-string nil)
 415 (make-variable-buffer-local 'company-search-string)
 416
 417 (defvar company-search-lighter " Search: \"\"")
 418 (make-variable-buffer-local 'company-search-lighter)
 419
 420 (defvar company-search-old-map nil)
 421 (make-variable-buffer-local 'company-search-old-map)
 422
 423 (defvar company-search-old-selection 0)
 424 (make-variable-buffer-local 'company-search-old-selection)
 425
 426 (defun company-search (text lines)
 427   (let ((quoted (regexp-quote text))
 428         (i 0))
 429     (dolist (line lines)
 430       (when (string-match quoted line (length company-prefix))
 431         (return i))
 432       (incf i))))
 433
 434 (defun company-search-printing-char ()
 435   (interactive)
 436   (setq company-search-string
 437         (concat (or company-search-string "") (string last-command-event))
 438         company-search-lighter (concat " Search: \"" company-search-string
 439                                         "\""))
 440   (let ((pos (company-search company-search-string
 441                               (nthcdr company-selection company-candidates))))
 442     (if (null pos)
 443         (ding)
 444       (company-set-selection (+ company-selection pos) t))))
 445
 446 (defun company-search-repeat-forward ()
 447   (interactive)
 448   (let ((pos (company-search company-search-string
 449                               (cdr (nthcdr company-selection
 450                                            company-candidates)))))
 451     (if (null pos)
 452         (ding)
 453       (company-set-selection (+ company-selection pos 1) t))))
 454
 455 (defun company-search-repeat-backward ()
 456   (interactive)
 457   (let ((pos (company-search company-search-string
 458                               (nthcdr (- (length company-candidates)
 459                                          company-selection)
 460                                       (reverse company-candidates)))))
 461     (if (null pos)
 462         (ding)
 463       (company-set-selection (- company-selection pos 1) t))))
 464
 465 (defun company-search-abort ()
 466   (interactive)
 467   (company-set-selection company-search-old-selection t)
 468   (company-search-mode 0))
 469
 470 (defun company-search-other-char ()
 471   (interactive)
 472   (company-search-mode 0)
 473   (when last-input-event
 474     (clear-this-command-keys t)
 475     (setq unread-command-events (list last-input-event))))
 476
 477 (defvar company-search-map
 478   (let ((i 0)
 479         (keymap (make-keymap)))
 480     (set-char-table-range (nth 1 keymap) (cons #x100 (max-char))
 481                           'company-search-printing-char)
 482     (define-key keymap [t] 'company-search-other-char)
 483     (while (< i ?\s)
 484       (define-key keymap (make-string 1 i) 'company-search-other-char)
 485       (incf i))
 486     (while (< i 256)
 487       (define-key keymap (vector i) 'company-search-printing-char)
 488       (incf i))
 489     (let ((meta-map (make-sparse-keymap)))
 490       (define-key keymap (char-to-string meta-prefix-char) meta-map)
 491       (define-key keymap [escape] meta-map))
 492     (define-key keymap (vector meta-prefix-char t) 'company-search-other-char)
 493     (define-key keymap "\e\e\e" 'company-search-other-char)
 494     (define-key keymap  [escape escape escape] 'company-search-other-char)
 495
 496     (define-key keymap "\C-g" 'company-search-abort)
 497     (define-key keymap "\C-s" 'company-search-repeat-forward)
 498     (define-key keymap "\C-r" 'company-search-repeat-backward)
 499     keymap))
 500
 501 (define-minor-mode company-search-mode
 502   ""
 503   nil company-search-lighter nil
 504   (if company-search-mode
 505       (if (company-manual-begin)
 506           (progn
 507             (setq company-search-old-selection company-selection)
 508             (company-enable-overriding-keymap company-search-map)
 509             (company-call-frontends 'update))
 510         (setq company-search-mode nil))
 511     (kill-local-variable 'company-search-string)
 512     (kill-local-variable 'company-search-lighter)
 513     (kill-local-variable 'company-search-old-selection)
 514     (company-enable-overriding-keymap company-active-map)))
 515
 516 (defun company-search-candidates ()
 517   (interactive)
 518   (company-search-mode 1))
 519
 520 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 521
 522 (defun company-select-next ()
 523   (interactive)
 524   (when (company-manual-begin)
 525     (company-set-selection (1+ company-selection))))
 526
 527 (defun company-select-previous ()
 528   (interactive)
 529   (when (company-manual-begin)
 530     (company-set-selection (1- company-selection))))
 531
 532 (defun company-complete-selection ()
 533   (interactive)
 534   (when (company-manual-begin)
 535     (insert (company-strip-prefix (nth company-selection company-candidates)))
 536     (company-abort)))
 537
 538 (defun company-complete-common ()
 539   (interactive)
 540   (when (company-manual-begin)
 541     (insert (company-strip-prefix company-common))))
 542
 543 (defun company-complete ()
 544   (interactive)
 545   (when (company-manual-begin)
 546     (if (or company-selection-changed
 547             (eq last-command 'company-complete-common))
 548         (call-interactively 'company-complete-selection)
 549       (call-interactively 'company-complete-common)
 550       (setq this-command 'company-complete-common))))
 551
 552 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 553
 554 (defconst company-space-strings-limit 100)
 555
 556 (defconst company-space-strings
 557   (let (lst)
 558     (dotimes (i company-space-strings-limit)
 559       (push (make-string (- company-space-strings-limit 1 i) ?\  ) lst))
 560     (apply 'vector lst)))
 561
 562 (defsubst company-space-string (len)
 563   (if (< len company-space-strings-limit)
 564       (aref company-space-strings len)
 565     (make-string len ?\ )))
 566
 567 (defsubst company-safe-substring (str from &optional to)
 568   (let ((len (length str)))
 569     (if (> from len)
 570         ""
 571       (if (and to (> to len))
 572           (concat (substring str from)
 573                   (company-space-string (- to len)))
 574         (substring str from to)))))
 575
 576 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 577
 578 (defvar company-last-metadata nil)
 579 (make-variable-buffer-local 'company-last-metadata)
 580
 581 (defun company-fetch-metadata ()
 582   (let ((selected (nth company-selection company-candidates)))
 583     (unless (equal selected (car company-last-metadata))
 584       (setq company-last-metadata
 585             (cons selected (funcall company-backend 'meta selected))))
 586     (cdr company-last-metadata)))
 587
 588 (defun company-doc-buffer (&optional string)
 589   (with-current-buffer (get-buffer-create "*Company meta-data*")
 590     (erase-buffer)
 591     (current-buffer)))
 592
 593 (defun company-show-doc-buffer ()
 594   (interactive)
 595   (when company-candidates
 596     (save-window-excursion
 597       (let* ((height (window-height))
 598              (row (cdr (posn-col-row (posn-at-point))))
 599              (selected (nth company-selection company-candidates))
 600              (buffer (funcall company-backend 'doc-buffer selected)))
 601         (if (not buffer)
 602             (error "No documentation available.")
 603           (display-buffer buffer)
 604           (and (< (window-height) height)
 605                (< (- (window-height) row 2) company-tooltip-limit)
 606                (recenter (- (window-height) row 2)))
 607           (read-event)
 608           (when last-input-event
 609             (clear-this-command-keys t)
 610             (setq unread-command-events (list last-input-event))))))))
 611
 612 ;;; pseudo-tooltip ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 613
 614 (defvar company-pseudo-tooltip-overlay nil)
 615 (make-variable-buffer-local 'company-pseudo-tooltip-overlay)
 616
 617 (defvar company-tooltip-offset 0)
 618 (make-variable-buffer-local 'company-tooltip-offset)
 619
 620 (defun company-pseudo-tooltip-update-offset (selection num-lines limit)
 621
 622   (decf limit 2)
 623   (setq company-tooltip-offset
 624         (max (min selection company-tooltip-offset)
 625              (- selection -1 limit)))
 626
 627   (when (<= company-tooltip-offset 1)
 628     (incf limit)
 629     (setq company-tooltip-offset 0))
 630
 631   (when (>= company-tooltip-offset (- num-lines limit 1))
 632     (incf limit)
 633     (when (= selection (1- num-lines))
 634       (decf company-tooltip-offset)
 635       (when (<= company-tooltip-offset 1)
 636         (setq company-tooltip-offset 0)
 637         (incf limit))))
 638
 639   limit)
 640
 641 ;;; propertize
 642
 643 (defun company-fill-propertize (line width selected)
 644   (setq line (company-safe-substring line 0 width))
 645   (add-text-properties 0 width (list 'face 'company-tooltip) line)
 646   (add-text-properties 0 (length company-common)
 647                        (list 'face 'company-tooltip-common) line)
 648   (when selected
 649     (if (and company-search-string
 650              (string-match (regexp-quote company-search-string) line
 651                            (length company-prefix)))
 652         (progn
 653           (add-text-properties (match-beginning 0) (match-end 0)
 654                                '(face company-tooltip-selection) line)
 655           (when (< (match-beginning 0) (length company-common))
 656             (add-text-properties (match-beginning 0) (length company-common)
 657                                  '(face company-tooltip-common-selection)
 658                                  line)))
 659       (add-text-properties 0 width '(face company-tooltip-selection) line)
 660       (add-text-properties 0 (length company-common)
 661                            (list 'face 'company-tooltip-common-selection)
 662                            line)))
 663   line)
 664
 665 ;;; replace
 666
 667 (defun company-buffer-lines (beg end)
 668   (goto-char beg)
 669   (let ((row (cdr (posn-col-row (posn-at-point))))
 670         lines)
 671     (while (and (equal (move-to-window-line (incf row)) row)
 672                 (<= (point) end))
 673       (push (buffer-substring beg (min end (1- (point)))) lines)
 674       (setq beg (point)))
 675     (unless (eq beg end)
 676       (push (buffer-substring beg end) lines))
 677     (nreverse lines)))
 678
 679 (defun company-modify-line (old new offset)
 680   (concat (company-safe-substring old 0 offset)
 681           new
 682           (company-safe-substring old (+ offset (length new)))))
 683
 684 (defun company-replacement-string (old lines column nl)
 685   (let (new)
 686     ;; Inject into old lines.
 687     (while old
 688       (push (company-modify-line (pop old) (pop lines) column) new))
 689     ;; Append whole new lines.
 690     (while lines
 691       (push (company-modify-line "" (pop lines) column) new))
 692     (concat (when nl "\n")
 693             (mapconcat 'identity (nreverse new) "\n")
 694             "\n")))
 695
 696 (defun company-create-lines (column lines selection limit)
 697
 698   (let ((len (length lines))
 699         width
 700         lines-copy
 701         previous
 702         remainder
 703         new)
 704
 705     ;; Scroll to offset.
 706     (setq limit (company-pseudo-tooltip-update-offset selection len limit))
 707
 708     (when (> company-tooltip-offset 0)
 709       (setq previous (format "...(%d)" company-tooltip-offset)))
 710
 711     (setq remainder (- len limit company-tooltip-offset)
 712           remainder (when (> remainder 0)
 713                       (setq remainder (format "...(%d)" remainder))))
 714
 715     (decf selection company-tooltip-offset)
 716     (setq width (min (length previous) (length remainder))
 717           lines (nthcdr company-tooltip-offset lines)
 718           len (min limit (length lines))
 719           lines-copy lines)
 720
 721     (dotimes (i len)
 722       (setq width (max (length (pop lines-copy)) width)))
 723     (setq width (min width (- (window-width) column)))
 724
 725     (when previous
 726       (push (propertize (company-safe-substring previous 0 width)
 727                         'face 'company-tooltip)
 728             new))
 729
 730     (dotimes (i len)
 731       (push (company-fill-propertize (company-reformat (pop lines))
 732                                      width (equal i selection))
 733             new))
 734
 735     (when remainder
 736       (push (propertize (company-safe-substring remainder 0 width)
 737                         'face 'company-tooltip)
 738             new))
 739
 740     (setq lines (nreverse new))))
 741
 742 ;; show
 743
 744 (defsubst company-pseudo-tooltip-height ()
 745   "Calculate the appropriate tooltip height."
 746   (max 3 (min company-tooltip-limit
 747               (- (window-height) (cdr (posn-col-row (posn-at-point))) 2))))
 748
 749 (defun company-pseudo-tooltip-show (row column lines selection)
 750   (company-pseudo-tooltip-hide)
 751   (unless lines (error "No text provided"))
 752   (save-excursion
 753
 754     (move-to-column 0)
 755
 756     (let* ((height (company-pseudo-tooltip-height))
 757            (lines (company-create-lines column lines selection height))
 758            (nl (< (move-to-window-line row) row))
 759            (beg (point))
 760            (end (save-excursion
 761                   (move-to-window-line (+ row height))
 762                   (point)))
 763            (old-string (company-buffer-lines beg end))
 764            str)
 765
 766       (setq company-pseudo-tooltip-overlay (make-overlay beg end))
 767
 768       (overlay-put company-pseudo-tooltip-overlay 'company-old old-string)
 769       (overlay-put company-pseudo-tooltip-overlay 'company-column column)
 770       (overlay-put company-pseudo-tooltip-overlay 'company-nl nl)
 771       (overlay-put company-pseudo-tooltip-overlay 'company-before
 772                    (company-replacement-string old-string lines column nl))
 773       (overlay-put company-pseudo-tooltip-overlay 'company-height height)
 774
 775       (overlay-put company-pseudo-tooltip-overlay 'window (selected-window)))))
 776
 777 (defun company-pseudo-tooltip-show-at-point (pos)
 778   (let ((col-row (posn-col-row (posn-at-point pos))))
 779     (company-pseudo-tooltip-show (1+ (cdr col-row)) (car col-row)
 780                                  company-candidates company-selection)))
 781
 782 (defun company-pseudo-tooltip-edit (lines selection)
 783   (let* ((old-string (overlay-get company-pseudo-tooltip-overlay 'company-old))
 784          (column (overlay-get company-pseudo-tooltip-overlay 'company-column))
 785          (nl (overlay-get company-pseudo-tooltip-overlay 'company-nl))
 786          (height (overlay-get company-pseudo-tooltip-overlay 'company-height))
 787          (lines (company-create-lines column lines selection height)))
 788     (overlay-put company-pseudo-tooltip-overlay 'company-before
 789                  (company-replacement-string old-string lines column nl))))
 790
 791 (defun company-pseudo-tooltip-hide ()
 792   (when company-pseudo-tooltip-overlay
 793     (delete-overlay company-pseudo-tooltip-overlay)
 794     (setq company-pseudo-tooltip-overlay nil)))
 795
 796 (defun company-pseudo-tooltip-hide-temporarily ()
 797   (when (overlayp company-pseudo-tooltip-overlay)
 798     (overlay-put company-pseudo-tooltip-overlay 'invisible nil)
 799     (overlay-put company-pseudo-tooltip-overlay 'before-string nil)))
 800
 801 (defun company-pseudo-tooltip-unhide ()
 802   (when company-pseudo-tooltip-overlay
 803     (overlay-put company-pseudo-tooltip-overlay 'invisible t)
 804     (overlay-put company-pseudo-tooltip-overlay 'before-string
 805                  (overlay-get company-pseudo-tooltip-overlay 'company-before))))
 806
 807 (defun company-pseudo-tooltip-frontend (command)
 808   (case command
 809     ('pre-command (company-pseudo-tooltip-hide-temporarily))
 810     ('post-command
 811      (unless (and (overlayp company-pseudo-tooltip-overlay)
 812                   (equal (overlay-get company-pseudo-tooltip-overlay
 813                                       'company-height)
 814                          (company-pseudo-tooltip-height)))
 815        ;; Redraw needed.
 816        (company-pseudo-tooltip-show-at-point (- (point)
 817                                                 (length company-prefix))))
 818      (company-pseudo-tooltip-unhide))
 819     ('hide (company-pseudo-tooltip-hide)
 820            (setq company-tooltip-offset 0))
 821     ('update (when (overlayp company-pseudo-tooltip-overlay)
 822                (company-pseudo-tooltip-edit company-candidates
 823                                             company-selection)))))
 824
 825 (defun company-pseudo-tooltip-unless-just-one-frontend (command)
 826   (unless (and (eq command 'post-command)
 827                (not (cdr company-candidates)))
 828     (company-pseudo-tooltip-frontend command)))
 829
 830 ;;; overlay ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 831
 832 (defvar company-preview-overlay nil)
 833 (make-variable-buffer-local 'company-preview-overlay)
 834
 835 (defun company-preview-show-at-point (pos)
 836   (company-preview-hide)
 837
 838   (setq company-preview-overlay (make-overlay pos pos))
 839
 840   (let ((completion (company-strip-prefix (nth company-selection
 841                                                company-candidates))))
 842     (and (equal pos (point))
 843          (not (equal completion ""))
 844          (add-text-properties 0 1 '(cursor t) completion))
 845
 846     (setq completion (propertize completion 'face 'company-preview))
 847     (add-text-properties 0 (- (length company-common) (length company-prefix))
 848                          '(face company-preview-common) completion)
 849
 850     (overlay-put company-preview-overlay 'after-string completion)
 851     (overlay-put company-preview-overlay 'window (selected-window))))
 852
 853 (defun company-preview-hide ()
 854   (when company-preview-overlay
 855     (delete-overlay company-preview-overlay)
 856     (setq company-preview-overlay nil)))
 857
 858 (defun company-preview-frontend (command)
 859   (case command
 860     ('pre-command (company-preview-hide))
 861     ('post-command (company-preview-show-at-point (point)))
 862     ('hide (company-preview-hide))))
 863
 864 (defun company-preview-if-just-one-frontend (command)
 865   (unless (and (eq command 'post-command)
 866                (cdr company-candidates))
 867     (company-preview-frontend command)))
 868
 869 ;;; echo ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 870
 871 (defvar company-echo-last-msg nil)
 872 (make-variable-buffer-local 'company-echo-last-msg)
 873
 874 (defun company-echo-refresh ()
 875   (let ((message-log-max nil))
 876     (if company-echo-last-msg
 877         (message "%s" company-echo-last-msg)
 878       (message ""))))
 879
 880 (defun company-echo-show (candidates)
 881
 882   ;; Roll to selection.
 883   (setq candidates (nthcdr company-selection candidates))
 884
 885   (let ((limit (window-width (minibuffer-window)))
 886         (len -1)
 887         comp msg)
 888     (while candidates
 889       (setq comp (company-reformat (pop candidates))
 890             len (+ len 1 (length comp)))
 891       (if (>= len limit)
 892           (setq candidates nil)
 893         (setq comp (propertize comp 'face 'company-echo))
 894         (add-text-properties 0 (length company-common)
 895                              '(face company-echo-common) comp)
 896         (push comp msg)))
 897
 898     (setq company-echo-last-msg (mapconcat 'identity (nreverse msg) " "))
 899     (company-echo-refresh)))
 900
 901 (defun company-echo-frontend (command)
 902   (case command
 903     ('pre-command (company-echo-refresh))
 904     ('post-command (company-echo-show company-candidates))
 905     ('hide (setq company-echo-last-msg nil))))
 906
 907 (defun company-echo-metadata-frontend (command)
 908   (case command
 909     ('pre-command (company-echo-refresh))
 910     ('post-command (setq company-echo-last-msg (company-fetch-metadata))
 911                    (company-echo-refresh))
 912     ('hide (setq company-echo-last-msg nil))))
 913
 914
 915 (provide 'company)
 916 ;;; company.el ends here