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

   1 (eval-when-compile (require 'cl))
   2
   3 (add-to-list 'debug-ignored-errors
   4              "^Pseudo tooltip frontend cannot be used twice$")
   5 (add-to-list 'debug-ignored-errors "^Preview frontend cannot be used twice$")
   6 (add-to-list 'debug-ignored-errors "^Echo area cannot be used twice$")
   7
   8 (defgroup company nil
   9   ""
  10   :group 'abbrev
  11   :group 'convenience
  12   :group 'maching)
  13
  14 (defface company-tooltip
  15   '((t :background "yellow"
  16        :foreground "black"))
  17   "*"
  18   :group 'company)
  19
  20 (defface company-tooltip-selection
  21   '((t :background "orange1"
  22        :foreground "black"))
  23   "*"
  24   :group 'company)
  25
  26 (defface company-tooltip-common
  27   '((t :inherit company-tooltip
  28        :foreground "red"))
  29   "*"
  30   :group 'company)
  31
  32 (defface company-tooltip-common-selection
  33   '((t :inherit company-tooltip-selection
  34        :foreground "red"))
  35   "*"
  36   :group 'company)
  37
  38 (defcustom company-tooltip-limit 10
  39   "*"
  40   :group 'company
  41   :type 'integer)
  42
  43 (defface company-preview
  44   '((t :background "blue4"
  45        :foreground "wheat"))
  46   "*"
  47   :group 'company)
  48
  49 (defface company-preview-common
  50   '((t :inherit company-preview
  51        :foreground "red"))
  52   "*"
  53   :group 'company)
  54
  55 (defface company-echo nil
  56   "*"
  57   :group 'company)
  58
  59 (defface company-echo-common
  60   '((((background dark)) (:foreground "firebrick1"))
  61     (((background light)) (:background "firebrick4")))
  62   "*"
  63   :group 'company)
  64
  65 (defun company-frontends-set (variable value)
  66   ;; uniquify
  67   (let ((remainder value))
  68     (setcdr remainder (delq (car remainder) (cdr remainder))))
  69   (and (memq 'company-pseudo-tooltip-unless-just-one-frontend value)
  70        (memq 'company-pseudo-tooltip-frontend value)
  71        (error "Pseudo tooltip frontend cannot be used twice"))
  72   (and (memq 'company-preview-if-just-one-frontend value)
  73        (memq 'company-preview-frontend value)
  74        (error "Preview frontend cannot be used twice"))
  75   (and (memq 'company-echo value)
  76        (memq 'company-echo-metadata-frontend value)
  77        (error "Echo area cannot be used twice"))
  78   ;; preview must come last
  79   (dolist (f '(company-preview-if-just-one-frontend company-preview-frontend))
  80     (when (memq f value)
  81       (setq value (append (delq f value) (list f)))))
  82   (set variable value))
  83
  84 (defcustom company-frontends '(company-pseudo-tooltip-unless-just-one-frontend
  85                                company-preview-if-just-one-frontend
  86                                company-echo-metadata-frontend)
  87   "*"
  88   :set 'company-frontends-set
  89   :group 'company
  90   :type '(repeat (choice (const :tag "echo" company-echo-frontend)
  91                          (const :tag "pseudo tooltip"
  92                                 company-pseudo-tooltip-frontend)
  93                          (const :tag "pseudo tooltip, multiple only"
  94                                 company-pseudo-tooltip-unless-just-one-frontend)
  95                          (const :tag "preview" company-preview-frontend)
  96                          (const :tag "preview, unique only"
  97                                 company-preview-if-just-one-frontend)
  98                          (function :tag "custom function" nil))))
  99
 100 (defcustom company-backends '(company-elisp company-nxml company-css
 101                               company-semantic company-oddmuse company-ispell)
 102   "*"
 103   :group 'company
 104   :type '(repeat (function :tag "function" nil)))
 105
 106 (defcustom company-minimum-prefix-length 3
 107   "*"
 108   :group 'company
 109   :type '(integer :tag "prefix length"))
 110
 111 (defvar company-timer nil)
 112
 113 (defun company-timer-set (variable value)
 114   (set variable value)
 115   (when company-timer (cancel-timer company-timer))
 116   (when (numberp value)
 117     (setq company-timer (run-with-idle-timer value t 'company-idle-begin))))
 118
 119 (defcustom company-idle-delay .7
 120   "*"
 121   :set 'company-timer-set
 122   :group 'company
 123   :type '(choice (const :tag "never (nil)" nil)
 124                  (const :tag "immediate (t)" t)
 125                  (number :tag "seconds")))
 126
 127 ;;; mode ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 128
 129 (defvar company-mode-map
 130   (let ((keymap (make-sparse-keymap)))
 131     (define-key keymap (kbd "M-n") 'company-select-next)
 132     (define-key keymap (kbd "M-p") 'company-select-previous)
 133     (define-key keymap (kbd "M-<return>") 'company-complete-selection)
 134     (define-key keymap "\t" 'company-complete)
 135     keymap))
 136
 137 ;;;###autoload
 138 (define-minor-mode company-mode
 139   ""
 140   nil " comp" company-mode-map
 141   (if company-mode
 142       (progn
 143         (add-hook 'pre-command-hook 'company-pre-command nil t)
 144         (add-hook 'post-command-hook 'company-post-command nil t)
 145         (company-timer-set 'company-idle-delay
 146                            company-idle-delay))
 147     (remove-hook 'pre-command-hook 'company-pre-command t)
 148     (remove-hook 'post-command-hook 'company-post-command t)
 149     (company-cancel)
 150     (kill-local-variable 'company-point)))
 151
 152 ;;; backends ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 153
 154 (defun company-grab (regexp &optional expression)
 155   (when (looking-back regexp)
 156     (or (match-string-no-properties (or expression 0)) "")))
 157
 158 (defun company-in-string-or-comment (&optional point)
 159   (let ((pos (syntax-ppss)))
 160     (or (nth 3 pos) (nth 4 pos) (nth 7 pos))))
 161
 162 ;;; completion mechanism ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 163
 164 (defvar company-backend nil)
 165 (make-variable-buffer-local 'company-backend)
 166
 167 (defvar company-prefix nil)
 168 (make-variable-buffer-local 'company-prefix)
 169
 170 (defvar company-candidates nil)
 171 (make-variable-buffer-local 'company-candidates)
 172
 173 (defvar company-candidates-cache nil)
 174 (make-variable-buffer-local 'company-candidates-cache)
 175
 176 (defvar company-common nil)
 177 (make-variable-buffer-local 'company-common)
 178
 179 (defvar company-selection 0)
 180 (make-variable-buffer-local 'company-selection)
 181
 182 (defvar company-selection-changed nil)
 183 (make-variable-buffer-local 'company-selection-changed)
 184
 185 (defvar company-point nil)
 186 (make-variable-buffer-local 'company-point)
 187
 188 (defvar company-disabled-backends nil)
 189
 190 (defsubst company-strip-prefix (str)
 191   (substring str (length company-prefix)))
 192
 193 (defsubst company-reformat (candidate)
 194   ;; company-ispell needs this, because the results are always lower-case
 195   ;; It's mory efficient to fix it only when they are displayed.
 196   (concat company-prefix (substring candidate (length company-prefix))))
 197
 198 (defsubst company-should-complete (prefix)
 199   (and (eq company-idle-delay t)
 200        (>= (length prefix) company-minimum-prefix-length)))
 201
 202 (defsubst company-call-frontends (command)
 203   (dolist (frontend company-frontends)
 204     (funcall frontend command)))
 205
 206 (defsubst company-calculate-candidates (prefix)
 207   (or (setq company-candidates (cdr (assoc prefix company-candidates-cache)))
 208       (let ((len (length prefix))
 209             (completion-ignore-case (funcall company-backend 'ignore-case))
 210             prev)
 211         (dotimes (i len)
 212           (when (setq prev (cdr (assoc (substring prefix 0 (- len i))
 213                                        company-candidates-cache)))
 214             (setq company-candidates (all-completions prefix prev))
 215             (return t))))
 216       (progn
 217         (setq company-candidates (funcall company-backend 'candidates prefix))
 218         (unless (funcall company-backend 'sorted)
 219           (setq company-candidates (sort company-candidates 'string<)))))
 220   (unless (assoc prefix company-candidates-cache)
 221     (push (cons prefix company-candidates) company-candidates-cache))
 222   (setq company-selection 0
 223         company-prefix prefix)
 224   (let ((completion-ignore-case (funcall company-backend 'ignore-case)))
 225     (setq company-common (try-completion company-prefix company-candidates)))
 226   (when (eq company-common t)
 227     (setq company-candidates nil))
 228   company-candidates)
 229
 230 (defun company-idle-begin ()
 231   (and company-mode
 232        (not company-candidates)
 233        (not (equal (point) company-point))
 234        (let ((company-idle-delay t))
 235          (company-begin)
 236          (company-post-command))))
 237
 238 (defun company-manual-begin ()
 239   (and company-mode
 240        (not company-candidates)
 241        (let ((company-idle-delay t)
 242              (company-minimum-prefix-length 0))
 243          (company-begin)))
 244   ;; Return non-nil if active.
 245   company-candidates)
 246
 247 (defun company-continue ()
 248   (when company-candidates
 249     (let ((new-prefix (funcall company-backend 'prefix)))
 250       (unless (and (= (- (point) (length new-prefix))
 251                       (- company-point (length company-prefix)))
 252                    (or (equal company-prefix new-prefix)
 253                        (company-calculate-candidates new-prefix)))
 254         (setq company-candidates nil)))))
 255
 256 (defun company-begin ()
 257   (company-continue)
 258   (unless company-candidates
 259     (let (prefix)
 260       (dolist (backend company-backends)
 261         (unless (fboundp backend)
 262           (ignore-errors (require backend nil t)))
 263         (if (fboundp backend)
 264             (when (setq prefix (funcall backend 'prefix))
 265               (when (company-should-complete prefix)
 266                 (setq company-backend backend)
 267                 (company-calculate-candidates prefix))
 268               (return prefix))
 269           (unless (memq backend company-disabled-backends)
 270             (push backend company-disabled-backends)
 271             (message "Company back-end '%s' could not be initialized"
 272                      backend))))))
 273   (if company-candidates
 274       (progn
 275         (setq company-point (point))
 276         (company-call-frontends 'update))
 277     (company-cancel)))
 278
 279 (defun company-cancel ()
 280   (setq company-backend nil
 281         company-prefix nil
 282         company-candidates nil
 283         company-candidates-cache nil
 284         company-common nil
 285         company-selection 0
 286         company-selection-changed nil
 287         company-point nil)
 288   (company-call-frontends 'hide))
 289
 290 (defun company-abort ()
 291   (company-cancel)
 292   ;; Don't start again, unless started manually.
 293   (setq company-point (point)))
 294
 295 (defun company-pre-command ()
 296   (when company-candidates
 297     (company-call-frontends 'pre-command)))
 298
 299 (defun company-post-command ()
 300   (unless (equal (point) company-point)
 301     (company-begin))
 302   (when company-candidates
 303     (company-call-frontends 'post-command)))
 304
 305 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 306
 307 (defun company-select-next ()
 308   (interactive)
 309   (when (company-manual-begin)
 310     (setq company-selection (min (1- (length company-candidates))
 311                                  (1+ company-selection))
 312           company-selection-changed t))
 313   (company-call-frontends 'update))
 314
 315 (defun company-select-previous ()
 316   (interactive)
 317   (when (company-manual-begin)
 318     (setq company-selection (max 0 (1- company-selection))
 319           company-selection-changed t))
 320   (company-call-frontends 'update))
 321
 322 (defun company-complete-selection ()
 323   (interactive)
 324   (when (company-manual-begin)
 325     (insert (company-strip-prefix (nth company-selection company-candidates)))
 326     (company-abort)))
 327
 328 (defun company-complete-common ()
 329   (interactive)
 330   (when (company-manual-begin)
 331     (insert (company-strip-prefix company-common))))
 332
 333 (defun company-complete ()
 334   (interactive)
 335   (when (company-manual-begin)
 336     (if (or company-selection-changed
 337             (eq last-command 'company-complete-common))
 338         (call-interactively 'company-complete-selection)
 339       (call-interactively 'company-complete-common)
 340       (setq this-command 'company-complete-common))))
 341
 342 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 343
 344 (defconst company-space-strings-limit 100)
 345
 346 (defconst company-space-strings
 347   (let (lst)
 348     (dotimes (i company-space-strings-limit)
 349       (push (make-string (- company-space-strings-limit 1 i) ?\  ) lst))
 350     (apply 'vector lst)))
 351
 352 (defsubst company-space-string (len)
 353   (if (< len company-space-strings-limit)
 354       (aref company-space-strings len)
 355     (make-string len ?\ )))
 356
 357 (defsubst company-safe-substring (str from &optional to)
 358   (let ((len (length str)))
 359     (if (> from len)
 360         ""
 361       (if (and to (> to len))
 362           (concat (substring str from)
 363                   (company-space-string (- to len)))
 364         (substring str from to)))))
 365
 366 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 367
 368 (defvar company-last-metadata nil)
 369 (make-variable-buffer-local 'company-last-metadata)
 370
 371 (defun company-fetch-metadata ()
 372   (let ((selected (nth company-selection company-candidates)))
 373     (unless (equal selected (car company-last-metadata))
 374       (setq company-last-metadata
 375             (cons selected (funcall company-backend 'meta selected))))
 376     (cdr company-last-metadata)))
 377
 378 ;;; pseudo-tooltip ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 379
 380 (defvar company-pseudo-tooltip-overlay nil)
 381 (make-variable-buffer-local 'company-pseudo-tooltip-overlay)
 382
 383 (defvar company-tooltip-offset 0)
 384 (make-variable-buffer-local 'company-tooltip-offset)
 385
 386 (defun company-pseudo-tooltip-update-offset (selection num-lines limit)
 387
 388   (decf limit 2)
 389   (setq company-tooltip-offset
 390         (max (min selection company-tooltip-offset)
 391              (- selection -1 limit)))
 392
 393   (when (<= company-tooltip-offset 1)
 394     (incf limit)
 395     (setq company-tooltip-offset 0))
 396
 397   (when (>= company-tooltip-offset (- num-lines limit 1))
 398     (incf limit)
 399     (when (= selection (1- num-lines))
 400       (setq company-tooltip-offset (max (1- company-tooltip-offset) 0))))
 401
 402   limit)
 403
 404 ;;; propertize
 405
 406 (defun company-fill-propertize (line width selected)
 407   (setq line (company-safe-substring line 0 width))
 408   (add-text-properties 0 width
 409                        (list 'face (if selected
 410                                        'company-tooltip-selection
 411                                      'company-tooltip)) line)
 412   (add-text-properties 0 (length company-common)
 413                        (list 'face (if selected
 414                                        'company-tooltip-common-selection
 415                                      'company-tooltip-common)) line)
 416   line)
 417
 418 ;;; replace
 419
 420 (defun company-buffer-lines (beg end)
 421   (goto-char beg)
 422   (let ((row (cdr (posn-col-row (posn-at-point))))
 423         lines)
 424     (while (< (point) end)
 425       (move-to-window-line (incf row))
 426       (push (buffer-substring beg (min end (1- (point)))) lines)
 427       (setq beg (point)))
 428     (nreverse lines)))
 429
 430 (defun company-modify-line (old new offset)
 431   (concat (company-safe-substring old 0 offset)
 432           new
 433           (company-safe-substring old (+ offset (length new)))))
 434
 435 (defun company-replacement-string (old lines column nl)
 436   (let (new)
 437     ;; Inject into old lines.
 438     (while old
 439       (push (company-modify-line (pop old) (pop lines) column) new))
 440     ;; Append whole new lines.
 441     (while lines
 442       (push (company-modify-line "" (pop lines) column) new))
 443     (concat (when nl "\n")
 444             (mapconcat 'identity (nreverse new) "\n")
 445             "\n")))
 446
 447 (defun company-create-lines (column lines selection)
 448
 449   (let ((limit (max company-tooltip-limit 3))
 450         (len (length lines))
 451         width
 452         lines-copy
 453         previous
 454         remainder
 455         new)
 456
 457     ;; Scroll to offset.
 458     (setq limit (company-pseudo-tooltip-update-offset selection len limit))
 459
 460     (when (> company-tooltip-offset 0)
 461       (setq previous (format "...(%d)" company-tooltip-offset)))
 462
 463     (setq remainder (- len limit company-tooltip-offset)
 464           remainder (when (> remainder 0)
 465                       (setq remainder (format "...(%d)" remainder))))
 466
 467     (decf selection company-tooltip-offset)
 468     (setq width (min (length previous) (length remainder))
 469           lines (nthcdr company-tooltip-offset lines)
 470           len (min limit (length lines))
 471           lines-copy lines)
 472
 473     (dotimes (i len)
 474       (setq width (max (length (pop lines-copy)) width)))
 475     (setq width (min width (- (window-width) column)))
 476
 477     (when previous
 478       (push (propertize (company-safe-substring previous 0 width)
 479                         'face 'company-tooltip)
 480             new))
 481
 482     (dotimes (i len)
 483       (push (company-fill-propertize (company-reformat (pop lines))
 484                                      width (equal i selection))
 485             new))
 486
 487     (when remainder
 488       (push (propertize (company-safe-substring remainder 0 width)
 489                         'face 'company-tooltip)
 490             new))
 491
 492     (setq lines (nreverse new))))
 493
 494 ;; show
 495
 496 (defun company-pseudo-tooltip-show (row column lines selection)
 497   (company-pseudo-tooltip-hide)
 498   (unless lines (error "No text provided"))
 499   (save-excursion
 500
 501     (move-to-column 0)
 502
 503     (let* ((lines (company-create-lines column lines selection))
 504            (nl (< (move-to-window-line row) row))
 505            (beg (point))
 506            (end (save-excursion
 507                   (move-to-window-line (min (window-height)
 508                                             (+ row company-tooltip-limit)))
 509                   (point)))
 510            (old-string (company-buffer-lines beg end))
 511            str)
 512
 513       (setq company-pseudo-tooltip-overlay (make-overlay beg end))
 514
 515       (overlay-put company-pseudo-tooltip-overlay 'company-old old-string)
 516       (overlay-put company-pseudo-tooltip-overlay 'company-column column)
 517       (overlay-put company-pseudo-tooltip-overlay 'company-nl nl)
 518       (overlay-put company-pseudo-tooltip-overlay 'company-before
 519                    (company-replacement-string old-string lines column nl))
 520
 521       (overlay-put company-pseudo-tooltip-overlay 'window (selected-window)))))
 522
 523 (defun company-pseudo-tooltip-show-at-point (pos)
 524   (let ((col-row (posn-col-row (posn-at-point pos))))
 525     (company-pseudo-tooltip-show (1+ (cdr col-row)) (car col-row)
 526                                  company-candidates company-selection)))
 527
 528 (defun company-pseudo-tooltip-edit (lines selection)
 529   (let* ((old-string (overlay-get company-pseudo-tooltip-overlay 'company-old))
 530          (column (overlay-get company-pseudo-tooltip-overlay 'company-column))
 531          (nl (overlay-get company-pseudo-tooltip-overlay 'company-nl))
 532          (lines (company-create-lines column lines selection)))
 533     (overlay-put company-pseudo-tooltip-overlay 'company-before
 534                  (company-replacement-string old-string lines column nl))))
 535
 536 (defun company-pseudo-tooltip-hide ()
 537   (when company-pseudo-tooltip-overlay
 538     (delete-overlay company-pseudo-tooltip-overlay)
 539     (setq company-pseudo-tooltip-overlay nil)))
 540
 541 (defun company-pseudo-tooltip-hide-temporarily ()
 542   (when (overlayp company-pseudo-tooltip-overlay)
 543     (overlay-put company-pseudo-tooltip-overlay 'invisible nil)
 544     (overlay-put company-pseudo-tooltip-overlay 'before-string nil)))
 545
 546 (defun company-pseudo-tooltip-unhide ()
 547   (when company-pseudo-tooltip-overlay
 548     (overlay-put company-pseudo-tooltip-overlay 'invisible t)
 549     (overlay-put company-pseudo-tooltip-overlay 'before-string
 550                  (overlay-get company-pseudo-tooltip-overlay 'company-before))))
 551
 552 (defun company-pseudo-tooltip-frontend (command)
 553   (case command
 554     ('pre-command (company-pseudo-tooltip-hide-temporarily))
 555     ('post-command
 556      (unless (overlayp company-pseudo-tooltip-overlay)
 557        (company-pseudo-tooltip-show-at-point (- (point)
 558                                                 (length company-prefix))))
 559      (company-pseudo-tooltip-unhide))
 560     ('hide (company-pseudo-tooltip-hide)
 561            (setq company-tooltip-offset 0))
 562     ('update (when (overlayp company-pseudo-tooltip-overlay)
 563                (company-pseudo-tooltip-edit company-candidates
 564                                             company-selection)))))
 565
 566 (defun company-pseudo-tooltip-unless-just-one-frontend (command)
 567   (unless (and (eq command 'post-command)
 568                (not (cdr company-candidates)))
 569     (company-pseudo-tooltip-frontend command)))
 570
 571 ;;; overlay ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 572
 573 (defvar company-preview-overlay nil)
 574 (make-variable-buffer-local 'company-preview-overlay)
 575
 576 (defun company-preview-show-at-point (pos)
 577   (company-preview-hide)
 578
 579   (setq company-preview-overlay (make-overlay pos pos))
 580
 581   (let ((completion (company-strip-prefix (nth company-selection
 582                                                company-candidates))))
 583     (and (equal pos (point))
 584          (not (equal completion ""))
 585          (add-text-properties 0 1 '(cursor t) completion))
 586
 587     (setq completion (propertize completion 'face 'company-preview))
 588     (add-text-properties 0 (- (length company-common) (length company-prefix))
 589                          '(face company-preview-common) completion)
 590
 591     (overlay-put company-preview-overlay 'after-string completion)
 592     (overlay-put company-preview-overlay 'window (selected-window))))
 593
 594 (defun company-preview-hide ()
 595   (when company-preview-overlay
 596     (delete-overlay company-preview-overlay)
 597     (setq company-preview-overlay nil)))
 598
 599 (defun company-preview-frontend (command)
 600   (case command
 601     ('pre-command (company-preview-hide))
 602     ('post-command (company-preview-show-at-point (point)))
 603     ('hide (company-preview-hide))))
 604
 605 (defun company-preview-if-just-one-frontend (command)
 606   (unless (and (eq command 'post-command)
 607                (cdr company-candidates))
 608     (company-preview-frontend command)))
 609
 610 ;;; echo ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 611
 612 (defvar company-echo-last-msg nil)
 613 (make-variable-buffer-local 'company-echo-last-msg)
 614
 615 (defun company-echo-refresh ()
 616   (let ((message-log-max nil))
 617     (if company-echo-last-msg
 618         (message "%s" company-echo-last-msg)
 619       (message ""))))
 620
 621 (defun company-echo-show (candidates)
 622
 623   ;; Roll to selection.
 624   (setq candidates (nthcdr company-selection candidates))
 625
 626   (let ((limit (window-width (minibuffer-window)))
 627         (len -1)
 628         comp msg)
 629     (while candidates
 630       (setq comp (company-reformat (pop candidates))
 631             len (+ len 1 (length comp)))
 632       (if (>= len limit)
 633           (setq candidates nil)
 634         (setq comp (propertize comp 'face 'company-echo))
 635         (add-text-properties 0 (length company-common)
 636                              '(face company-echo-common) comp)
 637         (push comp msg)))
 638
 639     (setq company-echo-last-msg (mapconcat 'identity (nreverse msg) " "))
 640     (company-echo-refresh)))
 641
 642 (defun company-echo-frontend (command)
 643   (case command
 644     ('pre-command (company-echo-refresh))
 645     ('post-command (company-echo-show company-candidates))
 646     ('hide (setq company-echo-last-msg nil))))
 647
 648 (defun company-echo-metadata-frontend (command)
 649   (case command
 650     ('pre-command (company-echo-refresh))
 651     ('post-command (setq company-echo-last-msg (company-fetch-metadata))
 652                    (company-echo-refresh))
 653     ('hide (setq company-echo-last-msg nil))))
 654
 655
 656 (provide 'company)
 657 ;;; company.el ends here