unofficial mirror of emacs-devel@gnu.org 
 help / color / mirror / code / Atom feed
blob 3f653fbf924e64cc0d43afb6e00cedbe52702d40 45259 bytes (raw)
name: lisp/apropos.el 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
 
;;; apropos.el --- apropos commands for users and programmers -*- lexical-binding: t -*-

;; Copyright (C) 1989, 1994-1995, 2001-2016 Free Software Foundation,
;; Inc.

;; Author: Joe Wells <jbw@bigbird.bu.edu>
;;	Daniel Pfeiffer <occitan@esperanto.org> (rewrite)
;; Keywords: help
;; Package: emacs

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; The ideas for this package were derived from the C code in
;; src/keymap.c and elsewhere.  The functions in this file should
;; always be byte-compiled for speed.  Someone should rewrite this in
;; C (as part of src/keymap.c) for speed.

;; The idea for super-apropos is based on the original implementation
;; by Lynn Slater <lrs@esl.com>.

;; History:
;; Fixed bug, current-local-map can return nil.
;; Change, doesn't calculate key-bindings unless needed.
;; Added super-apropos capability, changed print functions.
;; Made fast-apropos and super-apropos share code.
;; Sped up fast-apropos again.
;; Added apropos-do-all option.
;; Added fast-command-apropos.
;; Changed doc strings to comments for helping functions.
;; Made doc file buffer read-only, buried it.
;; Only call substitute-command-keys if do-all set.

;; Optionally use configurable faces to make the output more legible.
;; Differentiate between command, function and macro.
;; Apropos-command (ex command-apropos) does cmd and optionally user var.
;; Apropos shows all 3 aspects of symbols (fn, var and plist)
;; Apropos-documentation (ex super-apropos) now finds all it should.
;; New apropos-value snoops through all values and optionally plists.
;; Reading DOC file doesn't load nroff.
;; Added hypertext following of documentation, mouse-2 on variable gives value
;;   from buffer in active window.

;;; Code:

(require 'button)

(defgroup apropos nil
  "Apropos commands for users and programmers."
  :group 'help
  :prefix "apropos")

;; I see a degradation of maybe 10-20% only.
(defcustom apropos-do-all nil
  "Non nil means apropos commands will search more extensively.
This may be slower.  This option affects the following commands:

`apropos-user-option' will search all variables, not just user options.
`apropos-command' will also search non-interactive functions.
`apropos' will search all symbols, not just functions, variables, faces,
and those with property lists.
`apropos-value' will also search in property lists and functions.
`apropos-documentation' will search all documentation strings, not just
those in the etc/DOC documentation file.

This option only controls the default behavior.  Each of the above
commands also has an optional argument to request a more extensive search.

Additionally, this option makes the function `apropos-library'
include key-binding information in its output."
  :group 'apropos
  :type 'boolean)

(defface apropos-symbol
  '((t (:inherit bold)))
  "Face for the symbol name in Apropos output."
  :group 'apropos
  :version "24.3")

(defface apropos-keybinding
  '((t (:inherit underline)))
  "Face for lists of keybinding in Apropos output."
  :group 'apropos
  :version "24.3")

(defface apropos-property
  '((t (:inherit font-lock-builtin-face)))
  "Face for property name in Apropos output, or nil for none."
  :group 'apropos
  :version "24.3")

(defface apropos-function-button
  '((t (:inherit (font-lock-function-name-face button))))
  "Button face indicating a function, macro, or command in Apropos."
  :group 'apropos
  :version "24.3")

(defface apropos-variable-button
  '((t (:inherit (font-lock-variable-name-face button))))
  "Button face indicating a variable in Apropos."
  :group 'apropos
  :version "24.3")

(defface apropos-user-option-button
  '((t (:inherit (font-lock-variable-name-face button))))
  "Button face indicating a user option in Apropos."
  :group 'apropos
  :version "24.4")

(defface apropos-misc-button
  '((t (:inherit (font-lock-constant-face button))))
  "Button face indicating a miscellaneous object type in Apropos."
  :group 'apropos
  :version "24.3")

(defcustom apropos-match-face 'match
  "Face for matching text in Apropos documentation/value, or nil for none.
This applies when you look for matches in the documentation or variable value
for the pattern; the part that matches gets displayed in this font."
  :type '(choice (const nil) face)
  :group 'apropos
  :version "24.3")

(defcustom apropos-sort-by-scores nil
  "Non-nil means sort matches by scores; best match is shown first.
This applies to all `apropos' commands except `apropos-documentation'.
If value is `verbose', the computed score is shown for each match."
  :group 'apropos
  :type '(choice (const :tag "off" nil)
		 (const :tag "on" t)
		 (const :tag "show scores" verbose)))

(defcustom apropos-documentation-sort-by-scores t
  "Non-nil means sort matches by scores; best match is shown first.
This applies to `apropos-documentation' only.
If value is `verbose', the computed score is shown for each match."
  :group 'apropos
  :type '(choice (const :tag "off" nil)
		 (const :tag "on" t)
		 (const :tag "show scores" verbose)))

(defvar apropos-mode-map
  (let ((map (copy-keymap button-buffer-map)))
    (set-keymap-parent map special-mode-map)
    ;; Use `apropos-follow' instead of just using the button
    ;; definition of RET, so that users can use it anywhere in an
    ;; apropos item, not just on top of a button.
    (define-key map "\C-m" 'apropos-follow)
    map)
  "Keymap used in Apropos mode.")

(defvar apropos-mode-hook nil
  "Hook run when mode is turned on.")

(defvar apropos-pattern nil
  "Apropos pattern as entered by user.")

(defvar apropos-pattern-quoted nil
  "Apropos pattern passed through `regexp-quote'.")

(defvar apropos-words ()
  "Current list of apropos words extracted from `apropos-pattern'.")

(defvar apropos-all-words ()
  "Current list of words and synonyms.")

(defvar apropos-regexp nil
  "Regexp used in current apropos run.")

(defvar apropos-all-words-regexp nil
  "Regexp matching `apropos-all-words'.")

(defvar apropos-files-scanned ()
  "List of elc files already scanned in current run of `apropos-documentation'.")

(defvar apropos-accumulator ()
  "Alist of symbols already found in current apropos run.
Each element has the form

  (SYMBOL SCORE FUN-DOC VAR-DOC PLIST WIDGET-DOC FACE-DOC CUS-GROUP-DOC)

where SYMBOL is the symbol name, SCORE is its relevance score (a
number), FUN-DOC is the function docstring, VAR-DOC is the
variable docstring, PLIST is the list of the symbols names in the
property list, WIDGET-DOC is the widget docstring, FACE-DOC is
the face docstring, and CUS-GROUP-DOC is the custom group
docstring.  Each docstring is either nil or a string.")

(defvar apropos-item ()
  "Current item in or for `apropos-accumulator'.")

(defvar apropos-synonyms '(
  ("find" "open" "edit")
  ("kill" "cut")
  ("yank" "paste")
  ("region" "selection"))
  "List of synonyms known by apropos.
Each element is a list of words where the first word is the standard Emacs
term, and the rest of the words are alternative terms.")

\f
;;; Button types used by apropos

(define-button-type 'apropos-symbol
  'face 'apropos-symbol
  'help-echo "mouse-2, RET: Display more help on this symbol"
  'follow-link t
  'action #'apropos-symbol-button-display-help)

(defun apropos-symbol-button-display-help (button)
  "Display further help for the `apropos-symbol' button BUTTON."
  (button-activate
   (or (apropos-next-label-button (button-start button))
       (error "There is nothing to follow for `%s'" (button-label button)))))

(define-button-type 'apropos-function
  'apropos-label "Function"
  'apropos-short-label "f"
  'face 'apropos-function-button
  'help-echo "mouse-2, RET: Display more help on this function"
  'follow-link t
  'action (lambda (button)
	    (describe-function (button-get button 'apropos-symbol))))

(define-button-type 'apropos-macro
  'apropos-label "Macro"
  'apropos-short-label "m"
  'face 'apropos-function-button
  'help-echo "mouse-2, RET: Display more help on this macro"
  'follow-link t
  'action (lambda (button)
	    (describe-function (button-get button 'apropos-symbol))))

(define-button-type 'apropos-command
  'apropos-label "Command"
  'apropos-short-label "c"
  'face 'apropos-function-button
  'help-echo "mouse-2, RET: Display more help on this command"
  'follow-link t
  'action (lambda (button)
	    (describe-function (button-get button 'apropos-symbol))))

;; We used to use `customize-variable-other-window' instead for a
;; customizable variable, but that is slow.  It is better to show an
;; ordinary help buffer and let the user click on the customization
;; button in that buffer, if he wants to.
;; Likewise for `customize-face-other-window'.
(define-button-type 'apropos-variable
  'apropos-label "Variable"
  'apropos-short-label "v"
  'face 'apropos-variable-button
  'help-echo "mouse-2, RET: Display more help on this variable"
  'follow-link t
  'action (lambda (button)
	    (describe-variable (button-get button 'apropos-symbol))))

(define-button-type 'apropos-user-option
  'apropos-label "User option"
  'apropos-short-label "o"
  'face 'apropos-user-option-button
  'help-echo "mouse-2, RET: Display more help on this user option"
  'follow-link t
  'action (lambda (button)
	    (describe-variable (button-get button 'apropos-symbol))))

(define-button-type 'apropos-face
  'apropos-label "Face"
  'apropos-short-label "F"
  'face '(font-lock-variable-name-face button)
  'help-echo "mouse-2, RET: Display more help on this face"
  'follow-link t
  'action (lambda (button)
	    (describe-face (button-get button 'apropos-symbol))))

(define-button-type 'apropos-group
  'apropos-label "Group"
  'apropos-short-label "g"
  'face 'apropos-misc-button
  'help-echo "mouse-2, RET: Display more help on this group"
  'follow-link t
  'action (lambda (button)
	    (customize-group-other-window
	     (button-get button 'apropos-symbol))))

(define-button-type 'apropos-widget
  'apropos-label "Widget"
  'apropos-short-label "w"
  'face 'apropos-misc-button
  'help-echo "mouse-2, RET: Display more help on this widget"
  'follow-link t
  'action (lambda (button)
	    (widget-browse-other-window (button-get button 'apropos-symbol))))

(define-button-type 'apropos-plist
  'apropos-label "Properties"
  'apropos-short-label "p"
  'face 'apropos-misc-button
  'help-echo "mouse-2, RET: Display more help on this plist"
  'follow-link t
  'action (lambda (button)
	    (apropos-describe-plist (button-get button 'apropos-symbol))))

(define-button-type 'apropos-library
  'help-echo "mouse-2, RET: Display more help on this library"
  'follow-link t
  'action (lambda (button)
	    (apropos-library (button-get button 'apropos-symbol))))

(defun apropos-next-label-button (pos)
  "Return the next apropos label button after POS, or nil if there's none.
Will also return nil if more than one `apropos-symbol' button is encountered
before finding a label."
  (let* ((button (next-button pos t))
	 (already-hit-symbol nil)
	 (label (and button (button-get button 'apropos-label)))
	 (type (and button (button-get button 'type))))
    (while (and button
		(not label)
		(or (not (eq type 'apropos-symbol))
		    (not already-hit-symbol)))
      (when (eq type 'apropos-symbol)
	(setq already-hit-symbol t))
      (setq button (next-button (button-start button)))
      (when button
	(setq label (button-get button 'apropos-label))
	(setq type (button-get button 'type))))
    (and label button)))

\f
(defun apropos-words-to-regexp (words wild)
  "Make regexp matching any two of the words in WORDS.
WILD should be a subexpression matching wildcards between matches."
  (setq words (delete-dups (copy-sequence words)))
  (if (null (cdr words))
      (car words)
    (mapconcat
     (lambda (w)
       (concat "\\(?:" w "\\)" ;; parens for synonyms
               wild "\\(?:"
               (mapconcat 'identity
			  (delq w (copy-sequence words))
			  "\\|")
               "\\)"))
     words
     "\\|")))

;;;###autoload
(defun apropos-read-pattern (subject)
  "Read an apropos pattern, either a word list or a regexp.
Returns the user pattern, either a list of words which are matched
literally, or a string which is used as a regexp to search for.

SUBJECT is a string that is included in the prompt to identify what
kind of objects to search."
  (let ((pattern
	 (read-string (concat "Search for " subject " (word list or regexp): "))))
    (if (string-equal (regexp-quote pattern) pattern)
	;; Split into words
	(or (split-string pattern "[ \t]+" t)
	    (user-error "No word list given"))
      pattern)))

(defun apropos-parse-pattern (pattern)
  "Rewrite a list of words to a regexp matching all permutations.
If PATTERN is a string, that means it is already a regexp.
This updates variables `apropos-pattern', `apropos-pattern-quoted',
`apropos-regexp', `apropos-words', and `apropos-all-words-regexp'."
  (setq apropos-words nil
	apropos-all-words nil)
  (if (consp pattern)
      ;; We don't actually make a regexp matching all permutations.
      ;; Instead, for e.g. "a b c", we make a regexp matching
      ;; any combination of two or more words like this:
      ;; (a|b|c).*(a|b|c) which may give some false matches,
      ;; but as long as it also gives the right ones, that's ok.
      (let ((words pattern))
	(setq apropos-pattern (mapconcat 'identity pattern " ")
	      apropos-pattern-quoted (regexp-quote apropos-pattern))
	(dolist (word words)
	  (let ((syn apropos-synonyms) (s word) (a word))
	    (while syn
	      (if (member word (car syn))
		  (progn
		    (setq a (mapconcat 'identity (car syn) "\\|"))
		    (if (member word (cdr (car syn)))
			(setq s a))
		    (setq syn nil))
		(setq syn (cdr syn))))
	    (setq apropos-words (cons s apropos-words)
		  apropos-all-words (cons a apropos-all-words))))
	(setq apropos-all-words-regexp
	      (apropos-words-to-regexp apropos-all-words ".+"))
	(setq apropos-regexp
	      (apropos-words-to-regexp apropos-words ".*?")))
    (setq apropos-pattern-quoted (regexp-quote pattern)
	  apropos-all-words-regexp pattern
	  apropos-pattern pattern
	  apropos-regexp pattern)))

(defun apropos-calc-scores (str words)
  "Return apropos scores for string STR matching WORDS.
Value is a list of offsets of the words into the string."
  (let (scores i)
    (if words
	(dolist (word words scores)
	  (if (setq i (string-match word str))
	      (setq scores (cons i scores))))
      ;; Return list of start and end position of regexp
      (and (string-match apropos-pattern str)
	   (list (match-beginning 0) (match-end 0))))))

(defun apropos-score-str (str)
  "Return apropos score for string STR."
  (if str
      (let* ((l (length str))
	     (score (- (/ l 10))))
	(dolist (s (apropos-calc-scores str apropos-all-words) score)
	  (setq score (+ score 1000 (/ (* (- l s) 1000) l)))))
      0))

(defun apropos-score-doc (doc)
  "Return apropos score for documentation string DOC."
  (let ((l (length doc)))
    (if (> l 0)
	(let ((score 0))
	  (when (string-match apropos-pattern-quoted doc)
	    (setq score 10000))
	  (dolist (s (apropos-calc-scores doc apropos-all-words) score)
	    (setq score (+ score 50 (/ (* (- l s) 50) l)))))
      0)))

(defun apropos-score-symbol (symbol &optional weight)
  "Return apropos score for SYMBOL."
  (setq symbol (symbol-name symbol))
  (let ((score 0)
	(l (length symbol)))
    (dolist (s (apropos-calc-scores symbol apropos-words) (* score (or weight 3)))
      (setq score (+ score (- 60 l) (/ (* (- l s) 60) l))))))

(defun apropos-true-hit (str words)
  "Return t if STR is a genuine hit.
This may fail if only one of the keywords is matched more than once.
This requires at least two keywords (unless only one was given)."
  (or (not str)
      (not words)
      (not (cdr words))
      (> (length (apropos-calc-scores str words)) 1)))

(defun apropos-false-hit-symbol (symbol)
  "Return t if SYMBOL is not really matched by the current keywords."
  (not (apropos-true-hit (symbol-name symbol) apropos-words)))

(defun apropos-false-hit-str (str)
  "Return t if STR is not really matched by the current keywords."
  (not (apropos-true-hit str apropos-words)))

(defun apropos-true-hit-doc (doc)
  "Return t if DOC is really matched by the current keywords."
  (apropos-true-hit doc apropos-all-words))

(define-derived-mode apropos-mode special-mode "Apropos"
  "Major mode for following hyperlinks in output of apropos commands.

\\{apropos-mode-map}")

(defvar apropos-multi-type t
  "If non-nil, this apropos query concerns multiple types.
This is used to decide whether to print the result's type or not.")

;;;###autoload
(defun apropos-user-option (pattern &optional do-all)
  "Show user options that match PATTERN.
PATTERN can be a word, a list of words (separated by spaces),
or a regexp (using some regexp special characters).  If it is a word,
search for matches for that word as a substring.  If it is a list of words,
search for matches for any two (or more) of those words.

With \\[universal-argument] prefix, or if `apropos-do-all' is non-nil, also show
variables, not just user options."
  (interactive (list (apropos-read-pattern
		      (if (or current-prefix-arg apropos-do-all)
			  "variable" "user option"))
                     current-prefix-arg))
  (apropos-command pattern nil
		   (if (or do-all apropos-do-all)
		       #'(lambda (symbol)
			   (and (boundp symbol)
				(get symbol 'variable-documentation)))
		     'custom-variable-p)))

;;;###autoload
(defun apropos-variable (pattern &optional do-not-all)
  "Show variables that match PATTERN.
With the optional argument DO-NOT-ALL non-nil (or when called
interactively with the prefix \\[universal-argument]), show user
options only, i.e. behave like `apropos-user-option'."
  (interactive (list (apropos-read-pattern
		      (if current-prefix-arg "user option" "variable"))
                     current-prefix-arg))
  (let ((apropos-do-all (if do-not-all nil t)))
    (apropos-user-option pattern)))

;; For auld lang syne:
;;;###autoload
(defalias 'command-apropos 'apropos-command)
;;;###autoload
(defun apropos-command (pattern &optional do-all var-predicate)
  "Show commands (interactively callable functions) that match PATTERN.
PATTERN can be a word, a list of words (separated by spaces),
or a regexp (using some regexp special characters).  If it is a word,
search for matches for that word as a substring.  If it is a list of words,
search for matches for any two (or more) of those words.

With \\[universal-argument] prefix, or if `apropos-do-all' is non-nil, also show
noninteractive functions.

If VAR-PREDICATE is non-nil, show only variables, and only those that
satisfy the predicate VAR-PREDICATE.

When called from a Lisp program, a string PATTERN is used as a regexp,
while a list of strings is used as a word list."
  (interactive (list (apropos-read-pattern
		      (if (or current-prefix-arg apropos-do-all)
			  "command or function" "command"))
		     current-prefix-arg))
  (apropos-parse-pattern pattern)
  (let ((message
	 (let ((standard-output (get-buffer-create "*Apropos*")))
	   (help-print-return-message 'identity))))
    (or do-all (setq do-all apropos-do-all))
    (setq apropos-accumulator
	  (apropos-internal apropos-regexp
			    (or var-predicate
                                ;; We used to use `functionp' here, but this
                                ;; rules out macros.  `fboundp' rules in
                                ;; keymaps, but it seems harmless.
				(if do-all 'fboundp 'commandp))))
    (let ((tem apropos-accumulator))
      (while tem
	(if (or (get (car tem) 'apropos-inhibit)
		(apropos-false-hit-symbol (car tem)))
	    (setq apropos-accumulator (delq (car tem) apropos-accumulator)))
	(setq tem (cdr tem))))
    (let ((p apropos-accumulator)
	  doc symbol score)
      (while p
	(setcar p (list
		   (setq symbol (car p))
		   (setq score (apropos-score-symbol symbol))
		   (unless var-predicate
		     (if (fboundp symbol)
			 (if (setq doc (condition-case nil
                                           (documentation symbol t)
                                         (error 'error)))
                             ;; Eg alias to undefined function.
                             (if (eq doc 'error)
                                 "(documentation error)"
			       (setq score (+ score (apropos-score-doc doc)))
			       (substring doc 0 (string-match "\n" doc)))
			   "(not documented)")))
		   (and var-predicate
			(funcall var-predicate symbol)
			(if (setq doc (documentation-property
				       symbol 'variable-documentation t))
			     (progn
			       (setq score (+ score (apropos-score-doc doc)))
			       (substring doc 0
					  (string-match "\n" doc)))))))
	(setcar (cdr (car p)) score)
	(setq p (cdr p))))
    (and (let ((apropos-multi-type do-all))
           (apropos-print t nil nil t))
	 message
	 (message "%s" message))))


;;;###autoload
(defun apropos-documentation-property (symbol property raw)
  "Like (documentation-property SYMBOL PROPERTY RAW) but handle errors."
  (condition-case ()
      (let ((doc (documentation-property symbol property raw)))
	(if doc (substring doc 0 (string-match "\n" doc))
	  "(not documented)"))
    (error "(error retrieving documentation)")))


;;;###autoload
(defun apropos (pattern &optional do-all)
  "Show all meaningful Lisp symbols whose names match PATTERN.
Symbols are shown if they are defined as functions, variables, or
faces, or if they have nonempty property lists.

PATTERN can be a word, a list of words (separated by spaces),
or a regexp (using some regexp special characters).  If it is a word,
search for matches for that word as a substring.  If it is a list of words,
search for matches for any two (or more) of those words.

With \\[universal-argument] prefix, or if `apropos-do-all' is non-nil,
consider all symbols (if they match PATTERN).

Returns list of symbols and documentation found."
  (interactive (list (apropos-read-pattern "symbol")
		     current-prefix-arg))
  (apropos-parse-pattern pattern)
  (apropos-symbols-internal
   (apropos-internal apropos-regexp
		     (and (not do-all)
			  (not apropos-do-all)
			  (lambda (symbol)
			    (or (fboundp symbol)
				(boundp symbol)
				(facep symbol)
				(symbol-plist symbol)))))
   (or do-all apropos-do-all)))

(defun apropos-library-button (sym)
  (if (null sym)
      "<nothing>"
    (let ((name (copy-sequence (symbol-name sym))))
      (make-text-button name nil
                        'type 'apropos-library
                        'face 'apropos-symbol
                        'apropos-symbol name)
      name)))

;;;###autoload
(defun apropos-library (file)
  "List the variables and functions defined by library FILE.
FILE should be one of the libraries currently loaded and should
thus be found in `load-history'.  If `apropos-do-all' is non-nil,
the output includes key-bindings of commands."
  (interactive
   (let* ((libs (delq nil (mapcar 'car load-history)))
          (libs
           (nconc (delq nil
                        (mapcar
                         (lambda (l)
                           (setq l (file-name-nondirectory l))
                           (while
                               (not (equal (setq l (file-name-sans-extension l))
                                           l)))
                           l)
                         libs))
                  libs)))
     (list (completing-read "Describe library: " libs nil t))))
  (let ((symbols nil)
	;; (autoloads nil)
	(provides nil)
	(requires nil)
        (lh-entry (assoc file load-history)))
    (unless lh-entry
      ;; `file' may be the "shortname".
      (let ((lh load-history)
            (re (concat "\\(?:\\`\\|[\\/]\\)" (regexp-quote file)
                        "\\(\\.\\|\\'\\)")))
        (while (and lh (null lh-entry))
          (if (and (caar lh) (string-match re (caar lh)))
              (setq lh-entry (car lh))
            (setq lh (cdr lh)))))
      (unless lh-entry (error "Unknown library `%s'" file)))
    (dolist (x (cdr lh-entry))
      (pcase (car-safe x)
	;; (autoload (push (cdr x) autoloads))
	(`require (push (cdr x) requires))
	(`provide (push (cdr x) provides))
        (`t nil) ; Skip "was an autoload" entries.
        ;; FIXME: Print information about each individual method: both
        ;; its docstring and specializers (bug#21422).
        (`cl-defmethod (push (cadr x) provides))
	(_ (push (or (cdr-safe x) x) symbols))))
    (let ((apropos-pattern "")) ;Dummy binding for apropos-symbols-internal.
      (apropos-symbols-internal
       symbols apropos-do-all
       (concat
        (format-message
                "Library `%s' provides: %s\nand requires: %s"
                file
                (mapconcat 'apropos-library-button
                           (or provides '(nil)) " and ")
                (mapconcat 'apropos-library-button
                           (or requires '(nil)) " and ")))))))

(defun apropos-symbols-internal (symbols keys &optional text)
  ;; Filter out entries that are marked as apropos-inhibit.
  (let ((all nil))
    (dolist (symbol symbols)
      (unless (get symbol 'apropos-inhibit)
	(push symbol all)))
    (setq symbols all))
  (let ((apropos-accumulator
	 (mapcar
	  (lambda (symbol)
	    (let (doc properties)
	      (list
	       symbol
	       (apropos-score-symbol symbol)
	       (when (fboundp symbol)
		 (if (setq doc (condition-case nil
				   (documentation symbol t)
				 (void-function
				  "(alias for undefined function)")
				 (error
				  "(can't retrieve function documentation)")))
		     (substring doc 0 (string-match "\n" doc))
		   "(not documented)"))
	       (when (boundp symbol)
		 (apropos-documentation-property
		  symbol 'variable-documentation t))
	       (when (setq properties (symbol-plist symbol))
		 (setq doc (list (car properties)))
		 (while (setq properties (cdr (cdr properties)))
		   (setq doc (cons (car properties) doc)))
		 (mapconcat (lambda (p) (format "%s" p)) (nreverse doc) " "))
	       (when (get symbol 'widget-type)
		 (apropos-documentation-property
		  symbol 'widget-documentation t))
	       (when (facep symbol)
		 (let ((alias (get symbol 'face-alias)))
		   (if alias
		       (if (facep alias)
			   (format-message
			    "%slias for the face `%s'."
			    (if (get symbol 'obsolete-face) "Obsolete a" "A")
			    alias)
			 ;; Never happens in practice because fails
			 ;; (facep symbol) test.
			 "(alias for undefined face)")
		     (apropos-documentation-property
		      symbol 'face-documentation t))))
	       (when (get symbol 'custom-group)
		 (apropos-documentation-property
		  symbol 'group-documentation t)))))
	  symbols)))
    (apropos-print keys nil text)))


;;;###autoload
(defun apropos-value (pattern &optional do-all)
  "Show all symbols whose value's printed representation matches PATTERN.
PATTERN can be a word, a list of words (separated by spaces),
or a regexp (using some regexp special characters).  If it is a word,
search for matches for that word as a substring.  If it is a list of words,
search for matches for any two (or more) of those words.

With \\[universal-argument] prefix, or if `apropos-do-all' is non-nil, also looks
at function definitions (arguments, documentation and body) and at the
names and values of properties.

Returns list of symbols and values found."
  (interactive (list (apropos-read-pattern "value")
		     current-prefix-arg))
  (apropos-parse-pattern pattern)
  (or do-all (setq do-all apropos-do-all))
  (setq apropos-accumulator ())
   (let (f v p)
     (mapatoms
      (lambda (symbol)
	(setq f nil v nil p nil)
	(or (memq symbol '(apropos-regexp
			   apropos-pattern apropos-all-words-regexp
			   apropos-words apropos-all-words
			   do-all apropos-accumulator
			   symbol f v p))
	    (setq v (apropos-value-internal 'boundp symbol 'symbol-value)))
	(if do-all
	    (setq f (apropos-value-internal 'fboundp symbol 'symbol-function)
		  p (apropos-format-plist symbol "\n    " t)))
	(if (apropos-false-hit-str v)
	    (setq v nil))
	(if (apropos-false-hit-str f)
	    (setq f nil))
	(if (apropos-false-hit-str p)
	    (setq p nil))
	(if (or f v p)
	    (setq apropos-accumulator (cons (list symbol
						  (+ (apropos-score-str f)
						     (apropos-score-str v)
						     (apropos-score-str p))
						  f v p)
					    apropos-accumulator))))))
   (let ((apropos-multi-type do-all))
     (apropos-print nil "\n----------------\n")))


;;;###autoload
(defun apropos-documentation (pattern &optional do-all)
  "Show symbols whose documentation contains matches for PATTERN.
PATTERN can be a word, a list of words (separated by spaces),
or a regexp (using some regexp special characters).  If it is a word,
search for matches for that word as a substring.  If it is a list of words,
search for matches for any two (or more) of those words.

Note that by default this command only searches in the file specified by
`internal-doc-file-name'; i.e., the etc/DOC file.  With \\[universal-argument] prefix,
or if `apropos-do-all' is non-nil, it searches all currently defined
documentation strings.

Returns list of symbols and documentation found."
  ;; The doc used to say that DO-ALL includes key-bindings info in the
  ;; output, but I cannot see that that is true.
  (interactive (list (apropos-read-pattern "documentation")
		     current-prefix-arg))
  (apropos-parse-pattern pattern)
  (or do-all (setq do-all apropos-do-all))
  (setq apropos-accumulator () apropos-files-scanned ())
  (let ((standard-input (get-buffer-create " apropos-temp"))
	(apropos-sort-by-scores apropos-documentation-sort-by-scores)
	f v sf sv)
    (unwind-protect
	(with-current-buffer standard-input
	  (apropos-documentation-check-doc-file)
	  (if do-all
	      (mapatoms
	       (lambda (symbol)
		 (setq f (apropos-safe-documentation symbol)
		       v (get symbol 'variable-documentation))
		 (if (integerp v) (setq v nil))
		 (setq f (apropos-documentation-internal f)
		       v (apropos-documentation-internal v))
		 (setq sf (apropos-score-doc f)
		       sv (apropos-score-doc v))
		 (if (or f v)
		     (if (setq apropos-item
			       (cdr (assq symbol apropos-accumulator)))
			 (progn
			   (if f
			       (progn
				 (setcar (nthcdr 1 apropos-item) f)
				 (setcar apropos-item (+ (car apropos-item) sf))))
			   (if v
			       (progn
				 (setcar (nthcdr 2 apropos-item) v)
				 (setcar apropos-item (+ (car apropos-item) sv)))))
		       (setq apropos-accumulator
			     (cons (list symbol
					 (+ (apropos-score-symbol symbol 2) sf sv)
					 f v)
				   apropos-accumulator)))))))
	  (apropos-print nil "\n----------------\n" nil t))
      (kill-buffer standard-input))))

\f
(defun apropos-value-internal (predicate symbol function)
  (if (funcall predicate symbol)
      (progn
	(setq symbol (prin1-to-string (funcall function symbol)))
	(if (string-match apropos-regexp symbol)
	    (progn
	      (if apropos-match-face
		  (put-text-property (match-beginning 0) (match-end 0)
				     'face apropos-match-face
				     symbol))
	      symbol)))))

(defun apropos-documentation-internal (doc)
  (cond
   ((consp doc)
    (apropos-documentation-check-elc-file (car doc)))
   ((and doc
         ;; Sanity check in case bad data sneaked into the
         ;; documentation slot.
         (stringp doc)
         (string-match apropos-all-words-regexp doc)
         (apropos-true-hit-doc doc))
    (when apropos-match-face
      (setq doc (substitute-command-keys (copy-sequence doc)))
      (if (or (string-match apropos-pattern-quoted doc)
              (string-match apropos-all-words-regexp doc))
          (put-text-property (match-beginning 0)
                             (match-end 0)
                             'face apropos-match-face doc))
      doc))))

(defun apropos-format-plist (pl sep &optional compare)
  (setq pl (symbol-plist pl))
  (let (p p-out)
    (while pl
      (setq p (format "%s %S" (car pl) (nth 1 pl)))
      (if (or (not compare) (string-match apropos-regexp p))
	  (put-text-property 0 (length (symbol-name (car pl)))
			     'face 'apropos-property p)
	(setq p nil))
      (if p
	  (progn
	    (and compare apropos-match-face
		 (put-text-property (match-beginning 0) (match-end 0)
				    'face apropos-match-face
				    p))
	    (setq p-out (concat p-out (if p-out sep) p))))
      (setq pl (nthcdr 2 pl)))
    p-out))


;; Finds all documentation related to APROPOS-REGEXP in internal-doc-file-name.

(defun apropos-documentation-check-doc-file ()
  (let (type symbol (sepa 2) sepb doc)
    (insert ?\^_)
    (backward-char)
    (insert-file-contents (concat doc-directory internal-doc-file-name))
    (forward-char)
    (while (save-excursion
	     (setq sepb (search-forward "\^_"))
	     (not (eobp)))
      (beginning-of-line 2)
      (if (save-restriction
	    (narrow-to-region (point) (1- sepb))
	    (re-search-forward apropos-all-words-regexp nil t))
	  (progn
	    (goto-char (1+ sepa))
	    (setq type (if (eq ?F (preceding-char))
			   2	; function documentation
			 3)		; variable documentation
		  symbol (read)
		  doc (buffer-substring (1+ (point)) (1- sepb)))
	    (when (and (apropos-true-hit-doc doc)
                       ;; The DOC file lists all built-in funcs and vars.
                       ;; If any are not currently bound, they can
                       ;; only be platform-specific stuff (eg NS) not
                       ;; in use on the current platform.
                       ;; So we exclude them.
                       (cond ((= 3 type) (boundp symbol))
                             ((= 2 type) (fboundp symbol))))
	      (or (and (setq apropos-item (assq symbol apropos-accumulator))
		       (setcar (cdr apropos-item)
			       (apropos-score-doc doc)))
		  (setq apropos-item (list symbol
					   (+ (apropos-score-symbol symbol 2)
					      (apropos-score-doc doc))
					   nil nil)
			apropos-accumulator (cons apropos-item
						  apropos-accumulator)))
	      (when apropos-match-face
		(setq doc (substitute-command-keys doc))
		(if (or (string-match apropos-pattern-quoted doc)
			(string-match apropos-all-words-regexp doc))
		    (put-text-property (match-beginning 0)
				       (match-end 0)
				       'face apropos-match-face doc)))
	      (setcar (nthcdr type apropos-item) doc))))
      (setq sepa (goto-char sepb)))))

(defun apropos-documentation-check-elc-file (file)
  (if (member file apropos-files-scanned)
      nil
    (let (symbol doc beg end this-is-a-variable)
      (setq apropos-files-scanned (cons file apropos-files-scanned))
      (erase-buffer)
      (insert-file-contents file)
      (while (search-forward "\n#@" nil t)
	;; Read the comment length, and advance over it.
	(setq end (read)
	      beg (1+ (point))
	      end (+ (point) end -1))
	(forward-char)
	(if (save-restriction
	      ;; match ^ and $ relative to doc string
	      (narrow-to-region beg end)
	      (re-search-forward apropos-all-words-regexp nil t))
	    (progn
	      (goto-char (+ end 2))
	      (setq doc (buffer-substring beg end)
		    end (- (match-end 0) beg)
		    beg (- (match-beginning 0) beg))
	      (when (apropos-true-hit-doc doc)
		(setq this-is-a-variable (looking-at "(def\\(var\\|const\\) ")
		      symbol (progn
			       (skip-chars-forward "(a-z")
			       (forward-char)
			       (read))
		      symbol (if (consp symbol)
				 (nth 1 symbol)
			       symbol))
		(if (if this-is-a-variable
			(get symbol 'variable-documentation)
		      (and (fboundp symbol) (apropos-safe-documentation symbol)))
		    (progn
		      (or (and (setq apropos-item (assq symbol apropos-accumulator))
			       (setcar (cdr apropos-item)
				       (+ (cadr apropos-item) (apropos-score-doc doc))))
			  (setq apropos-item (list symbol
						   (+ (apropos-score-symbol symbol 2)
						      (apropos-score-doc doc))
						   nil nil)
				apropos-accumulator (cons apropos-item
							  apropos-accumulator)))
		      (when apropos-match-face
			(setq doc (substitute-command-keys doc))
			(if (or (string-match apropos-pattern-quoted doc)
				(string-match apropos-all-words-regexp doc))
			    (put-text-property (match-beginning 0)
					       (match-end 0)
					       'face apropos-match-face doc)))
		      (setcar (nthcdr (if this-is-a-variable 3 2)
				      apropos-item)
			      doc))))))))))



(defun apropos-safe-documentation (function)
  "Like `documentation', except it avoids calling `get_doc_string'.
Will return nil instead."
  (while (and function (symbolp function))
    (setq function (symbol-function function)))
  (if (eq (car-safe function) 'macro)
      (setq function (cdr function)))
  (setq function (if (byte-code-function-p function)
		     (if (> (length function) 4)
			 (aref function 4))
		   (if (autoloadp function)
		       (nth 2 function)
		     (if (eq (car-safe function) 'lambda)
			 (if (stringp (nth 2 function))
			     (nth 2 function)
			   (if (stringp (nth 3 function))
			       (nth 3 function)))))))
  (if (integerp function)
      nil
    function))

(defcustom apropos-compact-layout nil
  "If non-nil, use a single line per binding."
  :type 'boolean)

(defun apropos-print (do-keys spacing &optional text nosubst)
  "Output result of apropos searching into buffer `*Apropos*'.
The value of `apropos-accumulator' is the list of items to output.
Each element should have the format
 (SYMBOL SCORE FN-DOC VAR-DOC [PLIST-DOC WIDGET-DOC FACE-DOC GROUP-DOC]).
The return value is the list that was in `apropos-accumulator', sorted
alphabetically by symbol name; but this function also sets
`apropos-accumulator' to nil before returning.
If DO-KEYS is non-nil, output the key bindings.  If NOSUBST is
nil, substitute \"ASCII quotes\" (i.e., grace accent and
apostrophe) with curly quotes), and if non-nil, leave them alone.
If SPACING is non-nil, it should be a string; separate items with
that string.  If non-nil, TEXT is a string that will be printed
as a heading."
  (if (null apropos-accumulator)
      (message "No apropos matches for `%s'" apropos-pattern)
    (setq apropos-accumulator
	  (sort apropos-accumulator
		(lambda (a b)
		  (if apropos-sort-by-scores
		      (or (> (cadr a) (cadr b))
			  (and (= (cadr a) (cadr b))
			       (string-lessp (car a) (car b))))
		    (string-lessp (car a) (car b))))))
    (with-output-to-temp-buffer "*Apropos*"
      (let ((p apropos-accumulator)
	    (old-buffer (current-buffer))
	    (inhibit-read-only t)
	    (button-end 0)
	    symbol item)
	(set-buffer standard-output)
	(apropos-mode)
	(insert (substitute-command-keys "Type \\[apropos-follow] on ")
		(if apropos-multi-type "a type label" "an entry")
		" to view its full documentation.\n\n")
	(if text (insert text "\n\n"))
	(dolist (apropos-item p)
	  (when (and spacing (not (bobp)))
	    (princ spacing))
	  (setq symbol (car apropos-item))
	  ;; Insert dummy score element for backwards compatibility with 21.x
	  ;; apropos-item format.
	  (if (not (numberp (cadr apropos-item)))
	      (setq apropos-item
		    (cons (car apropos-item)
			  (cons nil (cdr apropos-item)))))
	  (when (= (point) button-end) (terpri))
	  (insert-text-button (symbol-name symbol)
			      'type 'apropos-symbol
			      'skip apropos-multi-type
			      'face 'apropos-symbol)
	  (setq button-end (point))
	  (if (and (eq apropos-sort-by-scores 'verbose)
		   (cadr apropos-item))
	      (insert " (" (number-to-string (cadr apropos-item)) ") "))
	  ;; Calculate key-bindings if we want them.
          (unless apropos-compact-layout
            (and do-keys
                 (commandp symbol)
                 (not (eq symbol 'self-insert-command))
                 (indent-to 30 1)
                 (if (let ((keys
                            (with-current-buffer old-buffer
                              (where-is-internal symbol)))
                           filtered)
                       ;; Copy over the list of key sequences,
                       ;; omitting any that contain a buffer or a frame.
                       ;; FIXME: Why omit keys that contain buffers and
                       ;; frames?  This looks like a bad workaround rather
                       ;; than a proper fix.  Does anybody know what problem
                       ;; this is trying to address?  --Stef
                       (dolist (key keys)
                         (let ((i 0)
                               loser)
                           (while (< i (length key))
                             (if (or (framep (aref key i))
                                     (bufferp (aref key i)))
                                 (setq loser t))
                             (setq i (1+ i)))
                           (or loser
                               (push key filtered))))
                       (setq item filtered))
                     ;; Convert the remaining keys to a string and insert.
                     (insert
                      (mapconcat
                       (lambda (key)
                         (setq key (condition-case ()
                                       (key-description key)
                                     (error)))
			 (put-text-property 0 (length key)
					    'face 'apropos-keybinding
					    key)
                         key)
                       item ", "))
                   (insert "M-x ... RET")
		   (put-text-property (- (point) 11) (- (point) 8)
				      'face 'apropos-keybinding)
		   (put-text-property (- (point) 3) (point)
				      'face 'apropos-keybinding)))
            (terpri))
	  (apropos-print-doc 2
			     (if (commandp symbol)
				 'apropos-command
			       (if (macrop symbol)
				   'apropos-macro
				 'apropos-function))
			     (not nosubst))
	  (apropos-print-doc 3
			     (if (custom-variable-p symbol)
				 'apropos-user-option
			       'apropos-variable)
			     (not nosubst))
	  (apropos-print-doc 7 'apropos-group t)
	  (apropos-print-doc 6 'apropos-face t)
	  (apropos-print-doc 5 'apropos-widget t)
	  (apropos-print-doc 4 'apropos-plist nil))
        (set (make-local-variable 'truncate-partial-width-windows) t)
        (set (make-local-variable 'truncate-lines) t))))
  (prog1 apropos-accumulator
    (setq apropos-accumulator ())))	; permit gc

(defun apropos-print-doc (i type do-keys)
  (let ((doc (nth i apropos-item)))
    (when (stringp doc)
      (if apropos-compact-layout
      	  (insert (propertize "\t" 'display '(space :align-to 32)) " ")
      	(insert "  "))
      (if apropos-multi-type
	  (let ((button-face (button-type-get type 'face)))
	    (unless (consp button-face)
	      (setq button-face (list button-face)))
	    (insert-text-button
	     (if apropos-compact-layout
		 (format "<%s>" (button-type-get type 'apropos-short-label))
	       (button-type-get type 'apropos-label))
	     'type type
	     'apropos-symbol (car apropos-item))
	    (insert (if apropos-compact-layout " " ": ")))

	;; If the query is only for a single type, there's no point
	;; writing it over and over again.  Insert a blank button, and
	;; put the 'apropos-label property there (needed by
	;; apropos-symbol-button-display-help).
	(insert-text-button
	 " " 'type type 'skip t
	 'face 'default 'apropos-symbol (car apropos-item)))

      (let ((opoint (point))
	    (ocol (current-column)))
	(cond ((equal doc "")
	       (setq doc "(not documented)"))
	      (do-keys
	       (setq doc (substitute-command-keys doc))))
	(insert doc)
	(if (equal doc "(not documented)")
	    (put-text-property opoint (point) 'font-lock-face 'shadow))
	;; The labeling buttons might make the line too long, so fill it if
	;; necessary.
	(let ((fill-column (+ 5 (if (integerp emacs-lisp-docstring-fill-column)
                                    emacs-lisp-docstring-fill-column
                                  fill-column)))
	      (fill-prefix (make-string ocol ?\s)))
	  (fill-region opoint (point) nil t)))
      (or (bolp) (terpri)))))

(defun apropos-follow ()
  "Invokes any button at point, otherwise invokes the nearest label button."
  (interactive)
  (button-activate
   (or (apropos-next-label-button (line-beginning-position))
       (error "There is nothing to follow here"))))


(defun apropos-describe-plist (symbol)
  "Display a pretty listing of SYMBOL's plist."
  (help-setup-xref (list 'apropos-describe-plist symbol)
		   (called-interactively-p 'interactive))
  (with-help-window (help-buffer)
    (set-buffer standard-output)
    (princ "Symbol ")
    (prin1 symbol)
    (princ (substitute-command-keys "'s plist is\n ("))
    (put-text-property (+ (point-min) 7) (- (point) 14)
		       'face 'apropos-symbol)
    (insert (apropos-format-plist symbol "\n  "))
    (princ ")")))


(provide 'apropos)

;;; apropos.el ends here

debug log:

solving 3f653fb ...
found 3f653fb in https://yhetil.org/emacs-devel/20160813181832.GA15753@holos.localdomain/
found 7c9ec12 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 7c9ec12c2e0bb7601a8f9f5bd9ebaa074f8e118b	lisp/apropos.el

applying [1/1] https://yhetil.org/emacs-devel/20160813181832.GA15753@holos.localdomain/
diff --git a/lisp/apropos.el b/lisp/apropos.el
index 7c9ec12..3f653fb 100644

Checking patch lisp/apropos.el...
Applied patch lisp/apropos.el cleanly.

index at:
100644 3f653fbf924e64cc0d43afb6e00cedbe52702d40	lisp/apropos.el

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).