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$")
   7 (add-to-list 'debug-ignored-errors "^No documentation available$")
   8
   9 (defgroup company nil
  10   ""
  11   :group 'abbrev
  12   :group 'convenience
  13   :group 'maching)
  14
  15 (defface company-tooltip
  16   '((t :background "yellow"
  17        :foreground "black"))
  18   "*"
  19   :group 'company)
  20
  21 (defface company-tooltip-selection
  22   '((t :background "orange1"
  23        :foreground "black"))
  24   "*"
  25   :group 'company)
  26
  27 (defface company-tooltip-common
  28   '((t :inherit company-tooltip
  29        :foreground "red"))
  30   "*"
  31   :group 'company)
  32
  33 (defface company-tooltip-common-selection
  34   '((t :inherit company-tooltip-selection
  35        :foreground "red"))
  36   "*"
  37   :group 'company)
  38
  39 (defcustom company-tooltip-limit 10
  40   "*"
  41   :group 'company
  42   :type 'integer)
  43
  44 (defface company-preview
  45   '((t :background "blue4"
  46        :foreground "wheat"))
  47   "*"
  48   :group 'company)
  49
  50 (defface company-preview-common
  51   '((t :inherit company-preview
  52        :foreground "red"))
  53   "*"
  54   :group 'company)
  55
  56 (defface company-echo nil
  57   "*"
  58   :group 'company)
  59
  60 (defface company-echo-common
  61   '((((background dark)) (:foreground "firebrick1"))
  62     (((background light)) (:background "firebrick4")))
  63   "*"
  64   :group 'company)
  65
  66 (defun company-frontends-set (variable value)
  67   ;; uniquify
  68   (let ((remainder value))
  69     (setcdr remainder (delq (car remainder) (cdr remainder))))
  70   (and (memq 'company-pseudo-tooltip-unless-just-one-frontend value)
  71        (memq 'company-pseudo-tooltip-frontend value)
  72        (error "Pseudo tooltip frontend cannot be used twice"))
  73   (and (memq 'company-preview-if-just-one-frontend value)
  74        (memq 'company-preview-frontend value)
  75        (error "Preview frontend cannot be used twice"))
  76   (and (memq 'company-echo value)
  77        (memq 'company-echo-metadata-frontend value)
  78        (error "Echo area cannot be used twice"))
  79   ;; preview must come last
  80   (dolist (f '(company-preview-if-just-one-frontend company-preview-frontend))
  81     (when (memq f value)
  82       (setq value (append (delq f value) (list f)))))
  83   (set variable value))
  84
  85 (defcustom company-frontends '(company-pseudo-tooltip-unless-just-one-frontend
  86                                company-preview-if-just-one-frontend
  87                                company-echo-metadata-frontend)
  88   "*"
  89   :set 'company-frontends-set
  90   :group 'company
  91   :type '(repeat (choice (const :tag "echo" company-echo-frontend)
  92                          (const :tag "pseudo tooltip"
  93                                 company-pseudo-tooltip-frontend)
  94                          (const :tag "pseudo tooltip, multiple only"
  95                                 company-pseudo-tooltip-unless-just-one-frontend)
  96                          (const :tag "preview" company-preview-frontend)
  97                          (const :tag "preview, unique only"
  98                                 company-preview-if-just-one-frontend)
  99                          (function :tag "custom function" nil))))
 100
 101 (defcustom company-backends '(company-elisp company-nxml company-css
 102                               company-semantic company-oddmuse company-ispell)
 103   "*"
 104   :group 'company
 105   :type '(repeat (function :tag "function" nil)))
 106
 107 (defcustom company-minimum-prefix-length 3
 108   "*"
 109   :group 'company
 110   :type '(integer :tag "prefix length"))
 111
 112 (defvar company-timer nil)
 113
 114 (defun company-timer-set (variable value)
 115   (set variable value)
 116   (when company-timer (cancel-timer company-timer))
 117   (when (numberp value)
 118     (setq company-timer (run-with-idle-timer value t 'company-idle-begin))))
 119
 120 (defcustom company-idle-delay .7
 121   "*"
 122   :set 'company-timer-set
 123   :group 'company
 124   :type '(choice (const :tag "never (nil)" nil)
 125                  (const :tag "immediate (t)" t)
 126                  (number :tag "seconds")))
 127
 128 ;;; mode ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 129
 130 (defvar company-mode-map
 131   (let ((keymap (make-sparse-keymap)))
 132     (define-key keymap (kbd "M-n") 'company-select-next)
 133     (define-key keymap (kbd "M-p") 'company-select-previous)
 134     (define-key keymap (kbd "M-<return>") 'company-complete-selection)
 135     (define-key keymap "\t" 'company-complete)
 136     (define-key keymap (kbd "<f1>") 'company-show-doc-buffer)
 137     keymap))
 138
 139 ;;;###autoload
 140 (define-minor-mode company-mode
 141   ""
 142   nil " comp" company-mode-map
 143   (if company-mode
 144       (progn
 145         (add-hook 'pre-command-hook 'company-pre-command nil t)
 146         (add-hook 'post-command-hook 'company-post-command nil t)
 147         (company-timer-set 'company-idle-delay
 148                            company-idle-delay))
 149     (remove-hook 'pre-command-hook 'company-pre-command t)
 150     (remove-hook 'post-command-hook 'company-post-command t)
 151     (company-cancel)
 152     (kill-local-variable 'company-point)))
 153
 154 ;;; backends ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 155
 156 (defun company-grab (regexp &optional expression)
 157   (when (looking-back regexp)
 158     (or (match-string-no-properties (or expression 0)) "")))
 159
 160 (defun company-in-string-or-comment (&optional point)
 161   (let ((pos (syntax-ppss)))
 162     (or (nth 3 pos) (nth 4 pos) (nth 7 pos))))
 163
 164 ;;; completion mechanism ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 165
 166 (defvar company-backend nil)
 167 (make-variable-buffer-local 'company-backend)
 168
 169 (defvar company-prefix nil)
 170 (make-variable-buffer-local 'company-prefix)
 171
 172 (defvar company-candidates nil)
 173 (make-variable-buffer-local 'company-candidates)
 174
 175 (defvar company-candidates-cache nil)
 176 (make-variable-buffer-local 'company-candidates-cache)
 177
 178 (defvar company-common nil)
 179 (make-variable-buffer-local 'company-common)
 180
 181 (defvar company-selection 0)
 182 (make-variable-buffer-local 'company-selection)
 183
 184 (defvar company-selection-changed nil)
 185 (make-variable-buffer-local 'company-selection-changed)
 186
 187 (defvar company-point nil)
 188 (make-variable-buffer-local 'company-point)
 189
 190 (defvar company-disabled-backends nil)
 191
 192 (defsubst company-strip-prefix (str)
 193   (substring str (length company-prefix)))
 194
 195 (defsubst company-reformat (candidate)
 196   ;; company-ispell needs this, because the results are always lower-case
 197   ;; It's mory efficient to fix it only when they are displayed.
 198   (concat company-prefix (substring candidate (length company-prefix))))
 199
 200 (defsubst company-should-complete (prefix)
 201   (and (eq company-idle-delay t)
 202        (>= (length prefix) company-minimum-prefix-length)))
 203
 204 (defsubst company-call-frontends (command)
 205   (dolist (frontend company-frontends)
 206     (funcall frontend command)))
 207
 208 (defsubst company-calculate-candidates (prefix)
 209   (or (setq company-candidates (cdr (assoc prefix company-candidates-cache)))
 210       (let ((len (length prefix))
 211             (completion-ignore-case (funcall company-backend 'ignore-case))
 212             prev)
 213         (dotimes (i len)
 214           (when (setq prev (cdr (assoc (substring prefix 0 (- len i))
 215                                        company-candidates-cache)))
 216             (setq company-candidates (all-completions prefix prev))
 217             (return t))))
 218       (progn
 219         (setq company-candidates (funcall company-backend 'candidates prefix))
 220         (unless (funcall company-backend 'sorted)
 221           (setq company-candidates (sort company-candidates 'string<)))))
 222   (unless (assoc prefix company-candidates-cache)
 223     (push (cons prefix company-candidates) company-candidates-cache))
 224   (setq company-selection 0
 225         company-prefix prefix)
 226   (let ((completion-ignore-case (funcall company-backend 'ignore-case)))
 227     (setq company-common (try-completion company-prefix company-candidates)))
 228   (when (eq company-common t)
 229     (setq company-candidates nil))
 230   company-candidates)
 231
 232 (defun company-idle-begin ()
 233   (and company-mode
 234        (not company-candidates)
 235        (not (equal (point) company-point))
 236        (let ((company-idle-delay t))
 237          (company-begin)
 238          (company-post-command))))
 239
 240 (defun company-manual-begin ()
 241   (and company-mode
 242        (not company-candidates)
 243        (let ((company-idle-delay t)
 244              (company-minimum-prefix-length 0))
 245          (company-begin)))
 246   ;; Return non-nil if active.
 247   company-candidates)
 248
 249 (defun company-continue ()
 250   (when company-candidates
 251     (let ((new-prefix (funcall company-backend 'prefix)))
 252       (unless (and (= (- (point) (length new-prefix))
 253                       (- company-point (length company-prefix)))
 254                    (or (equal company-prefix new-prefix)
 255                        (company-calculate-candidates new-prefix)))
 256         (setq company-candidates nil)))))
 257
 258 (defun company-begin ()
 259   (company-continue)
 260   (unless company-candidates
 261     (let (prefix)
 262       (dolist (backend company-backends)
 263         (unless (fboundp backend)
 264           (ignore-errors (require backend nil t)))
 265         (if (fboundp backend)
 266             (when (setq prefix (funcall backend 'prefix))
 267               (when (company-should-complete prefix)
 268                 (setq company-backend backend)
 269                 (company-calculate-candidates prefix))
 270               (return prefix))
 271           (unless (memq backend company-disabled-backends)
 272             (push backend company-disabled-backends)
 273             (message "Company back-end '%s' could not be initialized"
 274                      backend))))))
 275   (if company-candidates
 276       (progn
 277         (setq company-point (point))
 278         (company-call-frontends 'update))
 279     (company-cancel)))
 280
 281 (defun company-cancel ()
 282   (setq company-backend nil
 283         company-prefix nil
 284         company-candidates nil
 285         company-candidates-cache nil
 286         company-common nil
 287         company-selection 0
 288         company-selection-changed nil
 289         company-point nil)
 290   (company-call-frontends 'hide))
 291
 292 (defun company-abort ()
 293   (company-cancel)
 294   ;; Don't start again, unless started manually.
 295   (setq company-point (point)))
 296
 297 (defun company-pre-command ()
 298   (unless (eq this-command 'company-show-doc-buffer)
 299     (condition-case err
 300         (when company-candidates
 301           (company-call-frontends 'pre-command))
 302       (error (message "Company: An error occurred in pre-command")
 303              (message "%s" (error-message-string err))
 304              (company-cancel)))))
 305
 306 (defun company-post-command ()
 307   (unless (eq this-command 'company-show-doc-buffer)
 308     (condition-case err
 309         (progn
 310           (unless (equal (point) company-point)
 311             (company-begin))
 312           (when company-candidates
 313             (company-call-frontends 'post-command)))
 314       (error (message "Company: An error occurred in post-command")
 315              (message "%s" (error-message-string err))
 316              (company-cancel)))))
 317
 318 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 319
 320 (defun company-select-next ()
 321   (interactive)
 322   (when (company-manual-begin)
 323     (setq company-selection (min (1- (length company-candidates))
 324                                  (1+ company-selection))
 325           company-selection-changed t))
 326   (company-call-frontends 'update))
 327
 328 (defun company-select-previous ()
 329   (interactive)
 330   (when (company-manual-begin)
 331     (setq company-selection (max 0 (1- company-selection))
 332           company-selection-changed t))
 333   (company-call-frontends 'update))
 334
 335 (defun company-complete-selection ()
 336   (interactive)
 337   (when (company-manual-begin)
 338     (insert (company-strip-prefix (nth company-selection company-candidates)))
 339     (company-abort)))
 340
 341 (defun company-complete-common ()
 342   (interactive)
 343   (when (company-manual-begin)
 344     (insert (company-strip-prefix company-common))))
 345
 346 (defun company-complete ()
 347   (interactive)
 348   (when (company-manual-begin)
 349     (if (or company-selection-changed
 350             (eq last-command 'company-complete-common))
 351         (call-interactively 'company-complete-selection)
 352       (call-interactively 'company-complete-common)
 353       (setq this-command 'company-complete-common))))
 354
 355 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 356
 357 (defconst company-space-strings-limit 100)
 358
 359 (defconst company-space-strings
 360   (let (lst)
 361     (dotimes (i company-space-strings-limit)
 362       (push (make-string (- company-space-strings-limit 1 i) ?\  ) lst))
 363     (apply 'vector lst)))
 364
 365 (defsubst company-space-string (len)
 366   (if (< len company-space-strings-limit)
 367       (aref company-space-strings len)
 368     (make-string len ?\ )))
 369
 370 (defsubst company-safe-substring (str from &optional to)
 371   (let ((len (length str)))
 372     (if (> from len)
 373         ""
 374       (if (and to (> to len))
 375           (concat (substring str from)
 376                   (company-space-string (- to len)))
 377         (substring str from to)))))
 378
 379 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 380
 381 (defvar company-last-metadata nil)
 382 (make-variable-buffer-local 'company-last-metadata)
 383
 384 (defun company-fetch-metadata ()
 385   (let ((selected (nth company-selection company-candidates)))
 386     (unless (equal selected (car company-last-metadata))
 387       (setq company-last-metadata
 388             (cons selected (funcall company-backend 'meta selected))))
 389     (cdr company-last-metadata)))
 390
 391 (defun company-doc-buffer (&optional string)
 392   (with-current-buffer (get-buffer-create "*Company meta-data*")
 393     (erase-buffer)
 394     (current-buffer)))
 395
 396 (defun company-show-doc-buffer ()
 397   (interactive)
 398   (when company-candidates
 399     (save-window-excursion
 400       (let* ((selected (nth company-selection company-candidates))
 401              (buffer (funcall company-backend 'doc-buffer selected)))
 402         (if (not buffer)
 403             (error "No documentation available.")
 404           (display-buffer buffer)
 405           (read-event)
 406           (when last-input-event
 407             (clear-this-command-keys t)
 408             (setq unread-command-events (list last-input-event))))))))
 409
 410 ;;; pseudo-tooltip ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 411
 412 (defvar company-pseudo-tooltip-overlay nil)
 413 (make-variable-buffer-local 'company-pseudo-tooltip-overlay)
 414
 415 (defvar company-tooltip-offset 0)
 416 (make-variable-buffer-local 'company-tooltip-offset)
 417
 418 (defun company-pseudo-tooltip-update-offset (selection num-lines limit)
 419
 420   (decf limit 2)
 421   (setq company-tooltip-offset
 422         (max (min selection company-tooltip-offset)
 423              (- selection -1 limit)))
 424
 425   (when (<= company-tooltip-offset 1)
 426     (incf limit)
 427     (setq company-tooltip-offset 0))
 428
 429   (when (>= company-tooltip-offset (- num-lines limit 1))
 430     (incf limit)
 431     (when (= selection (1- num-lines))
 432       (setq company-tooltip-offset (max (1- company-tooltip-offset) 0))))
 433
 434   limit)
 435
 436 ;;; propertize
 437
 438 (defun company-fill-propertize (line width selected)
 439   (setq line (company-safe-substring line 0 width))
 440   (add-text-properties 0 width
 441                        (list 'face (if selected
 442                                        'company-tooltip-selection
 443                                      'company-tooltip)) line)
 444   (add-text-properties 0 (length company-common)
 445                        (list 'face (if selected
 446                                        'company-tooltip-common-selection
 447                                      'company-tooltip-common)) line)
 448   line)
 449
 450 ;;; replace
 451
 452 (defun company-buffer-lines (beg end)
 453   (goto-char beg)
 454   (let ((row (cdr (posn-col-row (posn-at-point))))
 455         lines)
 456     (while (< (point) end)
 457       (move-to-window-line (incf row))
 458       (push (buffer-substring beg (min end (1- (point)))) lines)
 459       (setq beg (point)))
 460     (nreverse lines)))
 461
 462 (defun company-modify-line (old new offset)
 463   (concat (company-safe-substring old 0 offset)
 464           new
 465           (company-safe-substring old (+ offset (length new)))))
 466
 467 (defun company-replacement-string (old lines column nl)
 468   (let (new)
 469     ;; Inject into old lines.
 470     (while old
 471       (push (company-modify-line (pop old) (pop lines) column) new))
 472     ;; Append whole new lines.
 473     (while lines
 474       (push (company-modify-line "" (pop lines) column) new))
 475     (concat (when nl "\n")
 476             (mapconcat 'identity (nreverse new) "\n")
 477             "\n")))
 478
 479 (defun company-create-lines (column lines selection)
 480
 481   (let ((limit (max company-tooltip-limit 3))
 482         (len (length lines))
 483         width
 484         lines-copy
 485         previous
 486         remainder
 487         new)
 488
 489     ;; Scroll to offset.
 490     (setq limit (company-pseudo-tooltip-update-offset selection len limit))
 491
 492     (when (> company-tooltip-offset 0)
 493       (setq previous (format "...(%d)" company-tooltip-offset)))
 494
 495     (setq remainder (- len limit company-tooltip-offset)
 496           remainder (when (> remainder 0)
 497                       (setq remainder (format "...(%d)" remainder))))
 498
 499     (decf selection company-tooltip-offset)
 500     (setq width (min (length previous) (length remainder))
 501           lines (nthcdr company-tooltip-offset lines)
 502           len (min limit (length lines))
 503           lines-copy lines)
 504
 505     (dotimes (i len)
 506       (setq width (max (length (pop lines-copy)) width)))
 507     (setq width (min width (- (window-width) column)))
 508
 509     (when previous
 510       (push (propertize (company-safe-substring previous 0 width)
 511                         'face 'company-tooltip)
 512             new))
 513
 514     (dotimes (i len)
 515       (push (company-fill-propertize (company-reformat (pop lines))
 516                                      width (equal i selection))
 517             new))
 518
 519     (when remainder
 520       (push (propertize (company-safe-substring remainder 0 width)
 521                         'face 'company-tooltip)
 522             new))
 523
 524     (setq lines (nreverse new))))
 525
 526 ;; show
 527
 528 (defun company-pseudo-tooltip-show (row column lines selection)
 529   (company-pseudo-tooltip-hide)
 530   (unless lines (error "No text provided"))
 531   (save-excursion
 532
 533     (move-to-column 0)
 534
 535     (let* ((lines (company-create-lines column lines selection))
 536            (nl (< (move-to-window-line row) row))
 537            (beg (point))
 538            (end (save-excursion
 539                   (move-to-window-line (min (window-height)
 540                                             (+ row company-tooltip-limit)))
 541                   (point)))
 542            (old-string (company-buffer-lines beg end))
 543            str)
 544
 545       (setq company-pseudo-tooltip-overlay (make-overlay beg end))
 546
 547       (overlay-put company-pseudo-tooltip-overlay 'company-old old-string)
 548       (overlay-put company-pseudo-tooltip-overlay 'company-column column)
 549       (overlay-put company-pseudo-tooltip-overlay 'company-nl nl)
 550       (overlay-put company-pseudo-tooltip-overlay 'company-before
 551                    (company-replacement-string old-string lines column nl))
 552
 553       (overlay-put company-pseudo-tooltip-overlay 'window (selected-window)))))
 554
 555 (defun company-pseudo-tooltip-show-at-point (pos)
 556   (let ((col-row (posn-col-row (posn-at-point pos))))
 557     (company-pseudo-tooltip-show (1+ (cdr col-row)) (car col-row)
 558                                  company-candidates company-selection)))
 559
 560 (defun company-pseudo-tooltip-edit (lines selection)
 561   (let* ((old-string (overlay-get company-pseudo-tooltip-overlay 'company-old))
 562          (column (overlay-get company-pseudo-tooltip-overlay 'company-column))
 563          (nl (overlay-get company-pseudo-tooltip-overlay 'company-nl))
 564          (lines (company-create-lines column lines selection)))
 565     (overlay-put company-pseudo-tooltip-overlay 'company-before
 566                  (company-replacement-string old-string lines column nl))))
 567
 568 (defun company-pseudo-tooltip-hide ()
 569   (when company-pseudo-tooltip-overlay
 570     (delete-overlay company-pseudo-tooltip-overlay)
 571     (setq company-pseudo-tooltip-overlay nil)))
 572
 573 (defun company-pseudo-tooltip-hide-temporarily ()
 574   (when (overlayp company-pseudo-tooltip-overlay)
 575     (overlay-put company-pseudo-tooltip-overlay 'invisible nil)
 576     (overlay-put company-pseudo-tooltip-overlay 'before-string nil)))
 577
 578 (defun company-pseudo-tooltip-unhide ()
 579   (when company-pseudo-tooltip-overlay
 580     (overlay-put company-pseudo-tooltip-overlay 'invisible t)
 581     (overlay-put company-pseudo-tooltip-overlay 'before-string
 582                  (overlay-get company-pseudo-tooltip-overlay 'company-before))))
 583
 584 (defun company-pseudo-tooltip-frontend (command)
 585   (case command
 586     ('pre-command (company-pseudo-tooltip-hide-temporarily))
 587     ('post-command
 588      (unless (overlayp company-pseudo-tooltip-overlay)
 589        (company-pseudo-tooltip-show-at-point (- (point)
 590                                                 (length company-prefix))))
 591      (company-pseudo-tooltip-unhide))
 592     ('hide (company-pseudo-tooltip-hide)
 593            (setq company-tooltip-offset 0))
 594     ('update (when (overlayp company-pseudo-tooltip-overlay)
 595                (company-pseudo-tooltip-edit company-candidates
 596                                             company-selection)))))
 597
 598 (defun company-pseudo-tooltip-unless-just-one-frontend (command)
 599   (unless (and (eq command 'post-command)
 600                (not (cdr company-candidates)))
 601     (company-pseudo-tooltip-frontend command)))
 602
 603 ;;; overlay ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 604
 605 (defvar company-preview-overlay nil)
 606 (make-variable-buffer-local 'company-preview-overlay)
 607
 608 (defun company-preview-show-at-point (pos)
 609   (company-preview-hide)
 610
 611   (setq company-preview-overlay (make-overlay pos pos))
 612
 613   (let ((completion (company-strip-prefix (nth company-selection
 614                                                company-candidates))))
 615     (and (equal pos (point))
 616          (not (equal completion ""))
 617          (add-text-properties 0 1 '(cursor t) completion))
 618
 619     (setq completion (propertize completion 'face 'company-preview))
 620     (add-text-properties 0 (- (length company-common) (length company-prefix))
 621                          '(face company-preview-common) completion)
 622
 623     (overlay-put company-preview-overlay 'after-string completion)
 624     (overlay-put company-preview-overlay 'window (selected-window))))
 625
 626 (defun company-preview-hide ()
 627   (when company-preview-overlay
 628     (delete-overlay company-preview-overlay)
 629     (setq company-preview-overlay nil)))
 630
 631 (defun company-preview-frontend (command)
 632   (case command
 633     ('pre-command (company-preview-hide))
 634     ('post-command (company-preview-show-at-point (point)))
 635     ('hide (company-preview-hide))))
 636
 637 (defun company-preview-if-just-one-frontend (command)
 638   (unless (and (eq command 'post-command)
 639                (cdr company-candidates))
 640     (company-preview-frontend command)))
 641
 642 ;;; echo ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 643
 644 (defvar company-echo-last-msg nil)
 645 (make-variable-buffer-local 'company-echo-last-msg)
 646
 647 (defun company-echo-refresh ()
 648   (let ((message-log-max nil))
 649     (if company-echo-last-msg
 650         (message "%s" company-echo-last-msg)
 651       (message ""))))
 652
 653 (defun company-echo-show (candidates)
 654
 655   ;; Roll to selection.
 656   (setq candidates (nthcdr company-selection candidates))
 657
 658   (let ((limit (window-width (minibuffer-window)))
 659         (len -1)
 660         comp msg)
 661     (while candidates
 662       (setq comp (company-reformat (pop candidates))
 663             len (+ len 1 (length comp)))
 664       (if (>= len limit)
 665           (setq candidates nil)
 666         (setq comp (propertize comp 'face 'company-echo))
 667         (add-text-properties 0 (length company-common)
 668                              '(face company-echo-common) comp)
 669         (push comp msg)))
 670
 671     (setq company-echo-last-msg (mapconcat 'identity (nreverse msg) " "))
 672     (company-echo-refresh)))
 673
 674 (defun company-echo-frontend (command)
 675   (case command
 676     ('pre-command (company-echo-refresh))
 677     ('post-command (company-echo-show company-candidates))
 678     ('hide (setq company-echo-last-msg nil))))
 679
 680 (defun company-echo-metadata-frontend (command)
 681   (case command
 682     ('pre-command (company-echo-refresh))
 683     ('post-command (setq company-echo-last-msg (company-fetch-metadata))
 684                    (company-echo-refresh))
 685     ('hide (setq company-echo-last-msg nil))))
 686
 687
 688 (provide 'company)
 689 ;;; company.el ends here