all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob 42e946cfcf6f4377aabd769d0243df42bb47d1c0 58583 bytes (raw)
name: lisp/progmodes/elisp-mode.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
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
 
;;; elisp-mode.el --- Emacs Lisp mode  -*- lexical-binding:t -*-

;; Copyright (C) 1985-1986, 1999-2015 Free Software Foundation, Inc.

;; Maintainer: emacs-devel@gnu.org
;; Keywords: lisp, languages
;; 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 major mode for editing Emacs Lisp code.
;; This mode is documented in the Emacs manual.

;;; Code:

(require 'lisp-mode)

(defvar emacs-lisp-mode-abbrev-table nil)
(define-abbrev-table 'emacs-lisp-mode-abbrev-table ()
  "Abbrev table for Emacs Lisp mode.
It has `lisp-mode-abbrev-table' as its parent."
  :parents (list lisp-mode-abbrev-table))

(defvar emacs-lisp-mode-syntax-table
  (let ((table (make-syntax-table lisp--mode-syntax-table)))
    (modify-syntax-entry ?\[ "(]  " table)
    (modify-syntax-entry ?\] ")[  " table)
    table)
  "Syntax table used in `emacs-lisp-mode'.")

(defvar emacs-lisp-mode-map
  (let ((map (make-sparse-keymap "Emacs-Lisp"))
	(menu-map (make-sparse-keymap "Emacs-Lisp"))
	(lint-map (make-sparse-keymap))
	(prof-map (make-sparse-keymap))
	(tracing-map (make-sparse-keymap)))
    (set-keymap-parent map lisp-mode-shared-map)
    (define-key map "\e\t" 'completion-at-point)
    (define-key map "\e\C-x" 'eval-defun)
    (define-key map "\e\C-q" 'indent-pp-sexp)
    (bindings--define-key map [menu-bar emacs-lisp]
      (cons "Emacs-Lisp" menu-map))
    (bindings--define-key menu-map [eldoc]
      '(menu-item "Auto-Display Documentation Strings" eldoc-mode
		  :button (:toggle . (bound-and-true-p eldoc-mode))
		  :help "Display the documentation string for the item under cursor"))
    (bindings--define-key menu-map [checkdoc]
      '(menu-item "Check Documentation Strings" checkdoc
		  :help "Check documentation strings for style requirements"))
    (bindings--define-key menu-map [re-builder]
      '(menu-item "Construct Regexp" re-builder
		  :help "Construct a regexp interactively"))
    (bindings--define-key menu-map [tracing] (cons "Tracing" tracing-map))
    (bindings--define-key tracing-map [tr-a]
      '(menu-item "Untrace All" untrace-all
		  :help "Untrace all currently traced functions"))
    (bindings--define-key tracing-map [tr-uf]
      '(menu-item "Untrace Function..." untrace-function
		  :help "Untrace function, and possibly activate all remaining advice"))
    (bindings--define-key tracing-map [tr-sep] menu-bar-separator)
    (bindings--define-key tracing-map [tr-q]
      '(menu-item "Trace Function Quietly..." trace-function-background
		  :help "Trace the function with trace output going quietly to a buffer"))
    (bindings--define-key tracing-map [tr-f]
      '(menu-item "Trace Function..." trace-function
		  :help "Trace the function given as an argument"))
    (bindings--define-key menu-map [profiling] (cons "Profiling" prof-map))
    (bindings--define-key prof-map [prof-restall]
      '(menu-item "Remove Instrumentation for All Functions" elp-restore-all
		  :help "Restore the original definitions of all functions being profiled"))
    (bindings--define-key prof-map [prof-restfunc]
      '(menu-item "Remove Instrumentation for Function..." elp-restore-function
		  :help "Restore an instrumented function to its original definition"))

    (bindings--define-key prof-map [sep-rem] menu-bar-separator)
    (bindings--define-key prof-map [prof-resall]
      '(menu-item "Reset Counters for All Functions" elp-reset-all
		  :help "Reset the profiling information for all functions being profiled"))
    (bindings--define-key prof-map [prof-resfunc]
      '(menu-item "Reset Counters for Function..." elp-reset-function
		  :help "Reset the profiling information for a function"))
    (bindings--define-key prof-map [prof-res]
      '(menu-item "Show Profiling Results" elp-results
		  :help "Display current profiling results"))
    (bindings--define-key prof-map [prof-pack]
      '(menu-item "Instrument Package..." elp-instrument-package
		  :help "Instrument for profiling all function that start with a prefix"))
    (bindings--define-key prof-map [prof-func]
      '(menu-item "Instrument Function..." elp-instrument-function
		  :help "Instrument a function for profiling"))
    ;; Maybe this should be in a separate submenu from the ELP stuff?
    (bindings--define-key prof-map [sep-natprof] menu-bar-separator)
    (bindings--define-key prof-map [prof-natprof-stop]
      '(menu-item "Stop Native Profiler" profiler-stop
		  :help "Stop recording profiling information"
		  :enable (and (featurep 'profiler)
			       (profiler-running-p))))
    (bindings--define-key prof-map [prof-natprof-report]
      '(menu-item "Show Profiler Report" profiler-report
		  :help "Show the current profiler report"
		  :enable (and (featurep 'profiler)
			       (profiler-running-p))))
    (bindings--define-key prof-map [prof-natprof-start]
      '(menu-item "Start Native Profiler..." profiler-start
		  :help "Start recording profiling information"))

    (bindings--define-key menu-map [lint] (cons "Linting" lint-map))
    (bindings--define-key lint-map [lint-di]
      '(menu-item "Lint Directory..." elint-directory
		  :help "Lint a directory"))
    (bindings--define-key lint-map [lint-f]
      '(menu-item "Lint File..." elint-file
		  :help "Lint a file"))
    (bindings--define-key lint-map [lint-b]
      '(menu-item "Lint Buffer" elint-current-buffer
		  :help "Lint the current buffer"))
    (bindings--define-key lint-map [lint-d]
      '(menu-item "Lint Defun" elint-defun
		  :help "Lint the function at point"))
    (bindings--define-key menu-map [edebug-defun]
      '(menu-item "Instrument Function for Debugging" edebug-defun
		  :help "Evaluate the top level form point is in, stepping through with Edebug"
		  :keys "C-u C-M-x"))
    (bindings--define-key menu-map [separator-byte] menu-bar-separator)
    (bindings--define-key menu-map [disas]
      '(menu-item "Disassemble Byte Compiled Object..." disassemble
		  :help "Print disassembled code for OBJECT in a buffer"))
    (bindings--define-key menu-map [byte-recompile]
      '(menu-item "Byte-recompile Directory..." byte-recompile-directory
		  :help "Recompile every `.el' file in DIRECTORY that needs recompilation"))
    (bindings--define-key menu-map [emacs-byte-compile-and-load]
      '(menu-item "Byte-compile and Load" emacs-lisp-byte-compile-and-load
		  :help "Byte-compile the current file (if it has changed), then load compiled code"))
    (bindings--define-key menu-map [byte-compile]
      '(menu-item "Byte-compile This File" emacs-lisp-byte-compile
		  :help "Byte compile the file containing the current buffer"))
    (bindings--define-key menu-map [separator-eval] menu-bar-separator)
    (bindings--define-key menu-map [ielm]
      '(menu-item "Interactive Expression Evaluation" ielm
		  :help "Interactively evaluate Emacs Lisp expressions"))
    (bindings--define-key menu-map [eval-buffer]
      '(menu-item "Evaluate Buffer" eval-buffer
		  :help "Execute the current buffer as Lisp code"))
    (bindings--define-key menu-map [eval-region]
      '(menu-item "Evaluate Region" eval-region
		  :help "Execute the region as Lisp code"
		  :enable mark-active))
    (bindings--define-key menu-map [eval-sexp]
      '(menu-item "Evaluate Last S-expression" eval-last-sexp
		  :help "Evaluate sexp before point; print value in echo area"))
    (bindings--define-key menu-map [separator-format] menu-bar-separator)
    (bindings--define-key menu-map [comment-region]
      '(menu-item "Comment Out Region" comment-region
		  :help "Comment or uncomment each line in the region"
		  :enable mark-active))
    (bindings--define-key menu-map [indent-region]
      '(menu-item "Indent Region" indent-region
		  :help "Indent each nonblank line in the region"
		  :enable mark-active))
    (bindings--define-key menu-map [indent-line]
      '(menu-item "Indent Line" lisp-indent-line))
    map)
  "Keymap for Emacs Lisp mode.
All commands in `lisp-mode-shared-map' are inherited by this map.")

(defun emacs-lisp-byte-compile ()
  "Byte compile the file containing the current buffer."
  (interactive)
  (if buffer-file-name
      (byte-compile-file buffer-file-name)
    (error "The buffer must be saved in a file first")))

(defun emacs-lisp-byte-compile-and-load ()
  "Byte-compile the current file (if it has changed), then load compiled code."
  (interactive)
  (or buffer-file-name
      (error "The buffer must be saved in a file first"))
  (require 'bytecomp)
  ;; Recompile if file or buffer has changed since last compilation.
  (if (and (buffer-modified-p)
	   (y-or-n-p (format "Save buffer %s first? " (buffer-name))))
      (save-buffer))
  (byte-recompile-file buffer-file-name nil 0 t))

(defun emacs-lisp-macroexpand ()
  "Macroexpand the form after point.
Comments in the form will be lost."
  (interactive)
  (let* ((start (point))
         (exp (read (current-buffer)))
         ;; Compute it before, since it may signal errors.
         (new (macroexpand-1 exp)))
    (if (equal exp new)
        (message "Not a macro call, nothing to expand")
      (delete-region start (point))
      (pp new (current-buffer))
      (if (bolp) (delete-char -1))
      (indent-region start (point)))))

(defcustom emacs-lisp-mode-hook nil
  "Hook run when entering Emacs Lisp mode."
  :options '(eldoc-mode imenu-add-menubar-index checkdoc-minor-mode)
  :type 'hook
  :group 'lisp)

;;;###autoload
(define-derived-mode emacs-lisp-mode prog-mode "Emacs-Lisp"
  "Major mode for editing Lisp code to run in Emacs.
Commands:
Delete converts tabs to spaces as it moves back.
Blank lines separate paragraphs.  Semicolons start comments.

\\{emacs-lisp-mode-map}"
  :group 'lisp
  (defvar xref-find-function)
  (defvar xref-identifier-completion-table-function)
  (lisp-mode-variables nil nil 'elisp)
  (setq imenu-case-fold-search nil)
  (add-function :before-until (local 'eldoc-documentation-function)
                #'elisp-eldoc-documentation-function)
  (setq-local xref-find-function #'elisp-xref-find)
  (setq-local xref-identifier-completion-table-function
              #'elisp--xref-identifier-completion-table)
  (add-hook 'completion-at-point-functions
            #'elisp-completion-at-point nil 'local))

;;; Completion at point for Elisp

(defun elisp--local-variables-1 (vars sexp)
  "Return the vars locally bound around the witness, or nil if not found."
  (let (res)
    (while
        (unless
            (setq res
                  (pcase sexp
                    (`(,(or `let `let*) ,bindings)
                     (let ((vars vars))
                       (when (eq 'let* (car sexp))
                         (dolist (binding (cdr (reverse bindings)))
                           (push (or (car-safe binding) binding) vars)))
                       (elisp--local-variables-1
                        vars (car (cdr-safe (car (last bindings)))))))
                    (`(,(or `let `let*) ,bindings . ,body)
                     (let ((vars vars))
                       (dolist (binding bindings)
                         (push (or (car-safe binding) binding) vars))
                       (elisp--local-variables-1 vars (car (last body)))))
                    (`(lambda ,_args)
                     ;; FIXME: Look for the witness inside `args'.
                     (setq sexp nil))
                    (`(lambda ,args . ,body)
                     (elisp--local-variables-1
                      (append (remq '&optional (remq '&rest args)) vars)
                      (car (last body))))
                    (`(condition-case ,_ ,e) (elisp--local-variables-1 vars e))
                    (`(condition-case ,v ,_ . ,catches)
                     (elisp--local-variables-1
                      (cons v vars) (cdr (car (last catches)))))
                    (`(quote . ,_)
                     ;; FIXME: Look for the witness inside sexp.
                     (setq sexp nil))
                    ;; FIXME: Handle `cond'.
                    (`(,_ . ,_)
                     (elisp--local-variables-1 vars (car (last sexp))))
                    (`elisp--witness--lisp (or vars '(nil)))
                    (_ nil)))
          ;; We didn't find the witness in the last element so we try to
          ;; backtrack to the last-but-one.
          (setq sexp (ignore-errors (butlast sexp)))))
    res))

(defun elisp--local-variables ()
  "Return a list of locally let-bound variables at point."
  (save-excursion
    (skip-syntax-backward "w_")
    (let* ((ppss (syntax-ppss))
           (txt (buffer-substring-no-properties (or (car (nth 9 ppss)) (point))
                                                (or (nth 8 ppss) (point))))
           (closer ()))
      (dolist (p (nth 9 ppss))
        (push (cdr (syntax-after p)) closer))
      (setq closer (apply #'string closer))
      (let* ((sexp (condition-case nil
                       (car (read-from-string
                             (concat txt "elisp--witness--lisp" closer)))
                     ((invalid-read-syntax end-of-file) nil)))
             (macroexpand-advice (lambda (expander form &rest args)
                                   (condition-case nil
                                       (apply expander form args)
                                     (error form))))
             (sexp
              (unwind-protect
                  (progn
                    (advice-add 'macroexpand :around macroexpand-advice)
                    (macroexpand-all sexp))
                (advice-remove 'macroexpand macroexpand-advice)))
             (vars (elisp--local-variables-1 nil sexp)))
        (delq nil
              (mapcar (lambda (var)
                        (and (symbolp var)
                             (not (string-match (symbol-name var) "\\`[&_]"))
                             ;; Eliminate uninterned vars.
                             (intern-soft var)
                             var))
                      vars))))))

(defvar elisp--local-variables-completion-table
  ;; Use `defvar' rather than `defconst' since defconst would purecopy this
  ;; value, which would doubly fail: it would fail because purecopy can't
  ;; handle the recursive bytecode object, and it would fail because it would
  ;; move `lastpos' and `lastvars' to pure space where they'd be immutable!
  (let ((lastpos nil) (lastvars nil))
    (letrec ((hookfun (lambda ()
                        (setq lastpos nil)
                        (remove-hook 'post-command-hook hookfun))))
      (completion-table-dynamic
       (lambda (_string)
         (save-excursion
           (skip-syntax-backward "_w")
           (let ((newpos (cons (point) (current-buffer))))
             (unless (equal lastpos newpos)
               (add-hook 'post-command-hook hookfun)
               (setq lastpos newpos)
               (setq lastvars
                     (mapcar #'symbol-name (elisp--local-variables))))))
         lastvars)))))

(defun elisp--expect-function-p (pos)
  "Return non-nil if the symbol at point is expected to be a function."
  (or
   (and (eq (char-before pos) ?')
        (eq (char-before (1- pos)) ?#))
   (save-excursion
     (let ((parent (nth 1 (syntax-ppss pos))))
       (when parent
         (goto-char parent)
         (and
          (looking-at (concat "(\\(cl-\\)?"
                              (regexp-opt '("declare-function"
                                            "function" "defadvice"
                                            "callf" "callf2"
                                            "defsetf"))
                              "[ \t\r\n]+"))
          (eq (match-end 0) pos)))))))

(defun elisp--form-quoted-p (pos)
  "Return non-nil if the form at POS is not evaluated.
It can be quoted, or be inside a quoted form."
  ;; FIXME: Do some macro expansion maybe.
  (save-excursion
    (let ((state (syntax-ppss pos)))
      (or (nth 8 state)   ; Code inside strings usually isn't evaluated.
          ;; FIXME: The 9th element is undocumented.
          (let ((nesting (cons (point) (reverse (nth 9 state))))
                res)
            (while (and nesting (not res))
              (goto-char (pop nesting))
              (cond
               ((or (eq (char-after) ?\[)
                    (progn
                      (skip-chars-backward " ")
                      (memq (char-before) '(?' ?`))))
                (setq res t))
               ((eq (char-before) ?,)
                (setq nesting nil))))
            res)))))

;; FIXME: Support for Company brings in features which straddle eldoc.
;; We should consolidate this, so that major modes can provide all that
;; data all at once:
;; - a function to extract "the reference at point" (may be more complex
;;     than a mere string, to distinguish various namespaces).
;; - a function to jump to such a reference.
;; - a function to show the signature/interface of such a reference.
;; - a function to build a help-buffer about that reference.
;; FIXME: Those functions should also be used by the normal completion code in
;; the *Completions* buffer.

(defun elisp--company-doc-buffer (str)
  (let ((symbol (intern-soft str)))
    ;; FIXME: we really don't want to "display-buffer and then undo it".
    (save-window-excursion
      ;; Make sure we don't display it in another frame, otherwise
      ;; save-window-excursion won't be able to undo it.
      (let ((display-buffer-overriding-action
             '(nil . ((inhibit-switch-frame . t)))))
        (ignore-errors
          (cond
           ((fboundp symbol) (describe-function symbol))
           ((boundp symbol) (describe-variable symbol))
           ((featurep symbol) (describe-package symbol))
           ((facep symbol) (describe-face symbol))
           (t (signal 'user-error nil)))
          (help-buffer))))))

(defun elisp--company-doc-string (str)
  (let* ((symbol (intern-soft str))
         (doc (if (fboundp symbol)
                  (documentation symbol t)
                (documentation-property symbol 'variable-documentation t))))
    (and (stringp doc)
         (string-match ".*$" doc)
         (match-string 0 doc))))

(declare-function find-library-name "find-func" (library))
(declare-function find-function-library "find-func" (function &optional l-o v))

(defun elisp--company-location (str)
  (let ((sym (intern-soft str)))
    (cond
     ((fboundp sym) (find-definition-noselect sym nil))
     ((boundp sym) (find-definition-noselect sym 'defvar))
     ((featurep sym)
      (require 'find-func)
      (cons (find-file-noselect (find-library-name
                                 (symbol-name sym)))
            0))
     ((facep sym) (find-definition-noselect sym 'defface)))))

(defun elisp-completion-at-point ()
  "Function used for `completion-at-point-functions' in `emacs-lisp-mode'."
  (with-syntax-table emacs-lisp-mode-syntax-table
    (let* ((pos (point))
	   (beg (condition-case nil
		    (save-excursion
		      (backward-sexp 1)
		      (skip-syntax-forward "'")
		      (point))
		  (scan-error pos)))
	   (end
	    (unless (or (eq beg (point-max))
			(member (char-syntax (char-after beg))
                                '(?\s ?\" ?\( ?\))))
	      (condition-case nil
		  (save-excursion
		    (goto-char beg)
		    (forward-sexp 1)
                    (skip-chars-backward "'")
		    (when (>= (point) pos)
		      (point)))
		(scan-error pos))))
           ;; t if in function position.
           (funpos (eq (char-before beg) ?\()))
      (when (and end (or (not (nth 8 (syntax-ppss)))
                         (eq (char-before beg) ?`)))
        (let ((table-etc
               (if (not funpos)
                   ;; FIXME: We could look at the first element of the list and
                   ;; use it to provide a more specific completion table in some
                   ;; cases.  E.g. filter out keywords that are not understood by
                   ;; the macro/function being called.
                   (cond
                    ((elisp--expect-function-p beg)
                     (list nil obarray
                           :predicate #'fboundp
                           :company-doc-buffer #'elisp--company-doc-buffer
                           :company-docsig #'elisp--company-doc-string
                           :company-location #'elisp--company-location))
                    ((elisp--form-quoted-p beg)
                     (list nil obarray
                           ;; Don't include all symbols (bug#16646).
                           :predicate (lambda (sym)
                                        (or (boundp sym)
                                            (fboundp sym)
                                            (featurep sym)
                                            (symbol-plist sym)))
                           :annotation-function
                           (lambda (str) (if (fboundp (intern-soft str)) " <f>"))
                           :company-doc-buffer #'elisp--company-doc-buffer
                           :company-docsig #'elisp--company-doc-string
                           :company-location #'elisp--company-location))
                    (t
                     (list nil (completion-table-merge
                                elisp--local-variables-completion-table
                                (apply-partially #'completion-table-with-predicate
                                                 obarray
                                                 #'boundp
                                                 'strict))
                           :company-doc-buffer #'elisp--company-doc-buffer
                           :company-docsig #'elisp--company-doc-string
                           :company-location #'elisp--company-location)))
                 ;; Looks like a funcall position.  Let's double check.
                 (save-excursion
                   (goto-char (1- beg))
                   (let ((parent
                          (condition-case nil
                              (progn (up-list -1) (forward-char 1)
                                     (let ((c (char-after)))
                                       (if (eq c ?\() ?\(
                                         (if (memq (char-syntax c) '(?w ?_))
                                             (read (current-buffer))))))
                            (error nil))))
                     (pcase parent
                       ;; FIXME: Rather than hardcode special cases here,
                       ;; we should use something like a symbol-property.
                       (`declare
                        (list t (mapcar (lambda (x) (symbol-name (car x)))
                                        (delete-dups
                                         ;; FIXME: We should include some
                                         ;; docstring with each entry.
                                         (append
                                          macro-declarations-alist
                                          defun-declarations-alist)))))
                       ((and (or `condition-case `condition-case-unless-debug)
                             (guard (save-excursion
                                      (ignore-errors
                                        (forward-sexp 2)
                                        (< (point) beg)))))
                        (list t obarray
                              :predicate (lambda (sym) (get sym 'error-conditions))))
                       ((and ?\(
                             (guard (save-excursion
                                      (goto-char (1- beg))
                                      (up-list -1)
                                      (forward-symbol -1)
                                      (looking-at "\\_<let\\*?\\_>"))))
                        (list t obarray
                              :predicate #'boundp
                              :company-doc-buffer #'elisp--company-doc-buffer
                              :company-docsig #'elisp--company-doc-string
                              :company-location #'elisp--company-location))
                       (_ (list nil obarray
                                :predicate #'fboundp
                                :company-doc-buffer #'elisp--company-doc-buffer
                                :company-docsig #'elisp--company-doc-string
                                :company-location #'elisp--company-location
                                ))))))))
          (nconc (list beg end)
                 (if (null (car table-etc))
                     (cdr table-etc)
                   (cons
                    (if (memq (char-syntax (or (char-after end) ?\s))
                              '(?\s ?>))
                        (cadr table-etc)
                      (apply-partially 'completion-table-with-terminator
                                       " " (cadr table-etc)))
                    (cddr table-etc)))))))))

(define-obsolete-function-alias
  'lisp-completion-at-point 'elisp-completion-at-point "25.1")

;;; Xref backend

(declare-function xref-make-elisp-location "xref" (symbol type file))
(declare-function xref-make-bogus-location "xref" (message))
(declare-function xref-make "xref" (description location))

(defun elisp-xref-find (action id)
  (require 'find-func)
  (pcase action
    (`definitions
      (let ((sym (intern-soft id)))
        (when sym
          (elisp--xref-find-definitions sym))))
    (`apropos
     (elisp--xref-find-apropos id))))

(defun elisp--xref-identifier-location (type sym)
  (let ((file
         (pcase type
           (`defun (when (fboundp sym)
                     (let ((fun-lib
                            (find-function-library sym)))
                       (setq sym (car fun-lib))
                       (cdr fun-lib))))
           (`defvar (when (boundp sym)
                      (or (symbol-file sym 'defvar)
                          (help-C-file-name sym 'var))))
           (`feature (when (featurep sym)
                       (ignore-errors
                         (find-library-name (symbol-name sym)))))
           (`defface (when (facep sym)
                       (symbol-file sym 'defface))))))
    (when file
      (when (string-match-p "\\.elc\\'" file)
        (setq file (substring file 0 -1)))
      (xref-make-elisp-location sym type file))))

(defun elisp--xref-find-definitions (symbol)
  (save-excursion
    (let (lst)
      (dolist (type '(feature defface defvar defun))
        (let ((loc
               (condition-case err
                   (elisp--xref-identifier-location type symbol)
                 (error
                  (xref-make-bogus-location (error-message-string err))))))
          (when loc
            (push
             (xref-make (format "(%s %s)" type symbol)
                        loc)
             lst))))
      lst)))

(defun elisp--xref-find-apropos (regexp)
  (apply #'nconc
         (let (lst)
           (dolist (sym (apropos-internal regexp))
            (push (elisp--xref-find-definitions sym) lst))
           (nreverse lst))))

(defvar elisp--xref-identifier-completion-table
  (apply-partially #'completion-table-with-predicate
                   obarray
                   (lambda (sym)
                     (or (boundp sym)
                         (fboundp sym)
                         (featurep sym)
                         (facep sym)))
                   'strict))

(defun elisp--xref-identifier-completion-table ()
  elisp--xref-identifier-completion-table)

;;; Elisp Interaction mode

(defvar lisp-interaction-mode-map
  (let ((map (make-sparse-keymap))
	(menu-map (make-sparse-keymap "Lisp-Interaction")))
    (set-keymap-parent map lisp-mode-shared-map)
    (define-key map "\e\C-x" 'eval-defun)
    (define-key map "\e\C-q" 'indent-pp-sexp)
    (define-key map "\e\t" 'completion-at-point)
    (define-key map "\n" 'eval-print-last-sexp)
    (bindings--define-key map [menu-bar lisp-interaction]
      (cons "Lisp-Interaction" menu-map))
    (bindings--define-key menu-map [eval-defun]
      '(menu-item "Evaluate Defun" eval-defun
		  :help "Evaluate the top-level form containing point, or after point"))
    (bindings--define-key menu-map [eval-print-last-sexp]
      '(menu-item "Evaluate and Print" eval-print-last-sexp
		  :help "Evaluate sexp before point; print value into current buffer"))
    (bindings--define-key menu-map [edebug-defun-lisp-interaction]
      '(menu-item "Instrument Function for Debugging" edebug-defun
		  :help "Evaluate the top level form point is in, stepping through with Edebug"
		  :keys "C-u C-M-x"))
    (bindings--define-key menu-map [indent-pp-sexp]
      '(menu-item "Indent or Pretty-Print" indent-pp-sexp
		  :help "Indent each line of the list starting just after point, or prettyprint it"))
    (bindings--define-key menu-map [complete-symbol]
      '(menu-item "Complete Lisp Symbol" completion-at-point
		  :help "Perform completion on Lisp symbol preceding point"))
    map)
  "Keymap for Lisp Interaction mode.
All commands in `lisp-mode-shared-map' are inherited by this map.")

(define-derived-mode lisp-interaction-mode emacs-lisp-mode "Lisp Interaction"
  "Major mode for typing and evaluating Lisp forms.
Like Lisp mode except that \\[eval-print-last-sexp] evals the Lisp expression
before point, and prints its value into the buffer, advancing point.
Note that printing is controlled by `eval-expression-print-length'
and `eval-expression-print-level'.

Commands:
Delete converts tabs to spaces as it moves back.
Paragraphs are separated only by blank lines.
Semicolons start comments.

\\{lisp-interaction-mode-map}"
  :abbrev-table nil)

;;; Emacs Lisp Byte-Code mode

(eval-and-compile
  (defconst emacs-list-byte-code-comment-re
    (concat "\\(#\\)@\\([0-9]+\\) "
            ;; Make sure it's a docstring and not a lazy-loaded byte-code.
            "\\(?:[^(]\\|([^\"]\\)")))

(defun elisp--byte-code-comment (end &optional _point)
  "Try to syntactically mark the #@NNN ....^_ docstrings in byte-code files."
  (let ((ppss (syntax-ppss)))
    (when (and (nth 4 ppss)
               (eq (char-after (nth 8 ppss)) ?#))
      (let* ((n (save-excursion
                  (goto-char (nth 8 ppss))
                  (when (looking-at emacs-list-byte-code-comment-re)
                    (string-to-number (match-string 2)))))
             ;; `maxdiff' tries to make sure the loop below terminates.
             (maxdiff n))
        (when n
          (let* ((bchar (match-end 2))
                 (b (position-bytes bchar)))
            (goto-char (+ b n))
            (while (let ((diff (- (position-bytes (point)) b n)))
                     (unless (zerop diff)
                       (when (> diff maxdiff) (setq diff maxdiff))
                       (forward-char (- diff))
                       (setq maxdiff (if (> diff 0) diff
                                       (max (1- maxdiff) 1)))
                       t))))
          (if (<= (point) end)
              (put-text-property (1- (point)) (point)
                                 'syntax-table
                                 (string-to-syntax "> b"))
            (goto-char end)))))))

(defun elisp-byte-code-syntax-propertize (start end)
  (elisp--byte-code-comment end (point))
  (funcall
   (syntax-propertize-rules
    (emacs-list-byte-code-comment-re
     (1 (prog1 "< b" (elisp--byte-code-comment end (point))))))
   start end))

;;;###autoload
(add-to-list 'auto-mode-alist '("\\.elc\\'" . elisp-byte-code-mode))
;;;###autoload
(define-derived-mode elisp-byte-code-mode emacs-lisp-mode
  "Elisp-Byte-Code"
  "Major mode for *.elc files."
  ;; TODO: Add way to disassemble byte-code under point.
  (setq-local open-paren-in-column-0-is-defun-start nil)
  (setq-local syntax-propertize-function
              #'elisp-byte-code-syntax-propertize))


;;; Globally accessible functionality

(defun eval-print-last-sexp (&optional eval-last-sexp-arg-internal)
  "Evaluate sexp before point; print value into current buffer.

Normally, this function truncates long output according to the value
of the variables `eval-expression-print-length' and
`eval-expression-print-level'.  With a prefix argument of zero,
however, there is no such truncation.  Such a prefix argument
also causes integers to be printed in several additional formats
\(octal, hexadecimal, and character).

If `eval-expression-debug-on-error' is non-nil, which is the default,
this command arranges for all errors to enter the debugger."
  (interactive "P")
  (let ((standard-output (current-buffer)))
    (terpri)
    (eval-last-sexp (or eval-last-sexp-arg-internal t))
    (terpri)))


(defun last-sexp-setup-props (beg end value alt1 alt2)
  "Set up text properties for the output of `elisp--eval-last-sexp'.
BEG and END are the start and end of the output in current-buffer.
VALUE is the Lisp value printed, ALT1 and ALT2 are strings for the
alternative printed representations that can be displayed."
  (let ((map (make-sparse-keymap)))
    (define-key map "\C-m" 'elisp-last-sexp-toggle-display)
    (define-key map [down-mouse-2] 'mouse-set-point)
    (define-key map [mouse-2] 'elisp-last-sexp-toggle-display)
    (add-text-properties
     beg end
     `(printed-value (,value ,alt1 ,alt2)
		     mouse-face highlight
		     keymap ,map
		     help-echo "RET, mouse-2: toggle abbreviated display"
		     rear-nonsticky (mouse-face keymap help-echo
						printed-value)))))


(defun elisp-last-sexp-toggle-display (&optional _arg)
  "Toggle between abbreviated and unabbreviated printed representations."
  (interactive "P")
  (save-restriction
    (widen)
    (let ((value (get-text-property (point) 'printed-value)))
      (when value
	(let ((beg (or (previous-single-property-change (min (point-max) (1+ (point)))
							'printed-value)
		       (point)))
	      (end (or (next-single-char-property-change (point) 'printed-value) (point)))
	      (standard-output (current-buffer))
	      (point (point)))
	  (delete-region beg end)
	  (insert (nth 1 value))
	  (or (= beg point)
	      (setq point (1- (point))))
	  (last-sexp-setup-props beg (point)
				 (nth 0 value)
				 (nth 2 value)
				 (nth 1 value))
	  (goto-char (min (point-max) point)))))))

(defun prin1-char (char)                ;FIXME: Move it, e.g. to simple.el.
  "Return a string representing CHAR as a character rather than as an integer.
If CHAR is not a character, return nil."
  (and (integerp char)
       (eventp char)
       (let ((c (event-basic-type char))
	     (mods (event-modifiers char))
	     string)
	 ;; Prevent ?A from turning into ?\S-a.
	 (if (and (memq 'shift mods)
		  (zerop (logand char ?\S-\^@))
		  (not (let ((case-fold-search nil))
			 (char-equal c (upcase c)))))
	     (setq c (upcase c) mods nil))
	 ;; What string are we considering using?
	 (condition-case nil
	     (setq string
		   (concat
		    "?"
		    (mapconcat
		     (lambda (modif)
		       (cond ((eq modif 'super) "\\s-")
			     (t (string ?\\ (upcase (aref (symbol-name modif) 0)) ?-))))
		     mods "")
		    (cond
		     ((memq c '(?\; ?\( ?\) ?\{ ?\} ?\[ ?\] ?\" ?\' ?\\)) (string ?\\ c))
		     ((eq c 127) "\\C-?")
		     (t
		      (string c)))))
	   (error nil))
	 ;; Verify the string reads a CHAR, not to some other character.
	 ;; If it doesn't, return nil instead.
	 (and string
	      (= (car (read-from-string string)) char)
	      string))))

(defun elisp--preceding-sexp ()
  "Return sexp before the point."
  (let ((opoint (point))
	ignore-quotes
	expr)
    (save-excursion
      (with-syntax-table emacs-lisp-mode-syntax-table
	;; If this sexp appears to be enclosed in `...'
	;; then ignore the surrounding quotes.
	(setq ignore-quotes
	      (or (eq (following-char) ?\')
		  (eq (preceding-char) ?\')))
	(forward-sexp -1)
	;; If we were after `?\e' (or similar case),
	;; use the whole thing, not just the `e'.
	(when (eq (preceding-char) ?\\)
	  (forward-char -1)
	  (when (eq (preceding-char) ??)
	    (forward-char -1)))

	;; Skip over hash table read syntax.
	(and (> (point) (1+ (point-min)))
	     (looking-back "#s" (- (point) 2))
	     (forward-char -2))

	;; Skip over `#N='s.
	(when (eq (preceding-char) ?=)
	  (let (labeled-p)
	    (save-excursion
	      (skip-chars-backward "0-9#=")
	      (setq labeled-p (looking-at "\\(#[0-9]+=\\)+")))
	    (when labeled-p
	      (forward-sexp -1))))

	(save-restriction
	  (if (and ignore-quotes (eq (following-char) ?`))
              ;; vladimir@cs.ualberta.ca 30-Jul-1997: Skip ` in `variable' so
              ;; that the value is returned, not the name.
	      (forward-char))
          (when (looking-at ",@?") (goto-char (match-end 0)))
	  (narrow-to-region (point-min) opoint)
	  (setq expr (read (current-buffer)))
          ;; If it's an (interactive ...) form, it's more useful to show how an
          ;; interactive call would use it.
          ;; FIXME: Is it really the right place for this?
          (when (eq (car-safe expr) 'interactive)
	       (setq expr
                  `(call-interactively
                    (lambda (&rest args) ,expr args))))
	  expr)))))
(define-obsolete-function-alias 'preceding-sexp 'elisp--preceding-sexp "25.1")

(defun elisp--eval-last-sexp (eval-last-sexp-arg-internal)
  "Evaluate sexp before point; print value in the echo area.
If EVAL-LAST-SEXP-ARG-INTERNAL is non-nil, print output into current buffer.
If EVAL-LAST-SEXP-ARG-INTERNAL is `0', print output with no limit on the length
and level of lists, and include additional formats for integers
\(octal, hexadecimal, and character)."
  (let ((standard-output (if eval-last-sexp-arg-internal (current-buffer) t)))
    ;; Setup the lexical environment if lexical-binding is enabled.
    (elisp--eval-last-sexp-print-value
     (eval (eval-sexp-add-defvars (elisp--preceding-sexp)) lexical-binding)
     eval-last-sexp-arg-internal)))


(defun elisp--eval-last-sexp-print-value (value &optional eval-last-sexp-arg-internal)
  (let ((unabbreviated (let ((print-length nil) (print-level nil))
			 (prin1-to-string value)))
	(print-length (and (not (zerop (prefix-numeric-value
					eval-last-sexp-arg-internal)))
			   eval-expression-print-length))
	(print-level (and (not (zerop (prefix-numeric-value
				       eval-last-sexp-arg-internal)))
			  eval-expression-print-level))
	(beg (point))
	end)
    (prog1
	(prin1 value)
      (let ((str (eval-expression-print-format value)))
	(if str (princ str)))
      (setq end (point))
      (when (and (bufferp standard-output)
		 (or (not (null print-length))
		     (not (null print-level)))
		 (not (string= unabbreviated
			       (buffer-substring-no-properties beg end))))
	(last-sexp-setup-props beg end value
			       unabbreviated
			       (buffer-substring-no-properties beg end))
	))))


(defvar elisp--eval-last-sexp-fake-value (make-symbol "t"))

(defun eval-sexp-add-defvars (exp &optional pos)
  "Prepend EXP with all the `defvar's that precede it in the buffer.
POS specifies the starting position where EXP was found and defaults to point."
  (setq exp (macroexpand-all exp))      ;Eager macro-expansion.
  (if (not lexical-binding)
      exp
    (save-excursion
      (unless pos (setq pos (point)))
      (let ((vars ()))
        (goto-char (point-min))
        (while (re-search-forward
                "(def\\(?:var\\|const\\|custom\\)[ \t\n]+\\([^; '()\n\t]+\\)"
                pos t)
          (let ((var (intern (match-string 1))))
            (and (not (special-variable-p var))
                 (save-excursion
                   (zerop (car (syntax-ppss (match-beginning 0)))))
              (push var vars))))
        `(progn ,@(mapcar (lambda (v) `(defvar ,v)) vars) ,exp)))))

(defun eval-last-sexp (eval-last-sexp-arg-internal)
  "Evaluate sexp before point; print value in the echo area.
Interactively, with prefix argument, print output into current buffer.

Normally, this function truncates long output according to the value
of the variables `eval-expression-print-length' and
`eval-expression-print-level'.  With a prefix argument of zero,
however, there is no such truncation.  Such a prefix argument
also causes integers to be printed in several additional formats
\(octal, hexadecimal, and character).

If `eval-expression-debug-on-error' is non-nil, which is the default,
this command arranges for all errors to enter the debugger."
  (interactive "P")
  (if (null eval-expression-debug-on-error)
      (elisp--eval-last-sexp eval-last-sexp-arg-internal)
    (let ((value
	   (let ((debug-on-error elisp--eval-last-sexp-fake-value))
	     (cons (elisp--eval-last-sexp eval-last-sexp-arg-internal)
		   debug-on-error))))
      (unless (eq (cdr value) elisp--eval-last-sexp-fake-value)
	(setq debug-on-error (cdr value)))
      (car value))))

(defun elisp--eval-defun-1 (form)
  "Treat some expressions specially.
Reset the `defvar' and `defcustom' variables to the initial value.
\(For `defcustom', use the :set function if there is one.)
Reinitialize the face according to the `defface' specification."
  ;; The code in edebug-defun should be consistent with this, but not
  ;; the same, since this gets a macroexpanded form.
  (cond ((not (listp form))
	 form)
	((and (eq (car form) 'defvar)
	      (cdr-safe (cdr-safe form))
	      (boundp (cadr form)))
	 ;; Force variable to be re-set.
	 `(progn (defvar ,(nth 1 form) nil ,@(nthcdr 3 form))
		 (setq-default ,(nth 1 form) ,(nth 2 form))))
	;; `defcustom' is now macroexpanded to
	;; `custom-declare-variable' with a quoted value arg.
	((and (eq (car form) 'custom-declare-variable)
	      (default-boundp (eval (nth 1 form) lexical-binding)))
	 ;; Force variable to be bound, using :set function if specified.
	 (let ((setfunc (memq :set form)))
	   (when setfunc
	     (setq setfunc (car-safe (cdr-safe setfunc)))
	     (or (functionp setfunc) (setq setfunc nil)))
	   (funcall (or setfunc 'set-default)
		    (eval (nth 1 form) lexical-binding)
		    ;; The second arg is an expression that evaluates to
		    ;; an expression.  The second evaluation is the one
		    ;; normally performed not by normal execution but by
		    ;; custom-initialize-set (for example), which does not
		    ;; use lexical-binding.
		    (eval (eval (nth 2 form) lexical-binding))))
	 form)
	;; `defface' is macroexpanded to `custom-declare-face'.
	((eq (car form) 'custom-declare-face)
	 ;; Reset the face.
	 (let ((face-symbol (eval (nth 1 form) lexical-binding)))
	   (setq face-new-frame-defaults
		 (assq-delete-all face-symbol face-new-frame-defaults))
	   (put face-symbol 'face-defface-spec nil)
	   (put face-symbol 'face-override-spec nil))
	 form)
	((eq (car form) 'progn)
	 (cons 'progn (mapcar #'elisp--eval-defun-1 (cdr form))))
	(t form)))

(defun elisp--eval-defun ()
  "Evaluate defun that point is in or before.
The value is displayed in the echo area.
If the current defun is actually a call to `defvar',
then reset the variable using the initial value expression
even if the variable already has some other value.
\(Normally `defvar' does not change the variable's value
if it already has a value.\)

Return the result of evaluation."
  ;; FIXME: the print-length/level bindings should only be applied while
  ;; printing, not while evaluating.
  (let ((debug-on-error eval-expression-debug-on-error)
	(print-length eval-expression-print-length)
	(print-level eval-expression-print-level))
    (save-excursion
      ;; Arrange for eval-region to "read" the (possibly) altered form.
      ;; eval-region handles recording which file defines a function or
      ;; variable.
      (let ((standard-output t)
            beg end form)
        ;; Read the form from the buffer, and record where it ends.
        (save-excursion
          (end-of-defun)
          (beginning-of-defun)
          (setq beg (point))
          (setq form (read (current-buffer)))
          (setq end (point)))
        ;; Alter the form if necessary.
        (let ((form (eval-sexp-add-defvars
                     (elisp--eval-defun-1 (macroexpand form)))))
          (eval-region beg end standard-output
                       (lambda (_ignore)
                         ;; Skipping to the end of the specified region
                         ;; will make eval-region return.
                         (goto-char end)
                         form))))))
  (let ((str (eval-expression-print-format (car values))))
    (if str (princ str)))
  ;; The result of evaluation has been put onto VALUES.  So return it.
  (car values))

(defun eval-defun (edebug-it)
  "Evaluate the top-level form containing point, or after point.

If the current defun is actually a call to `defvar' or `defcustom',
evaluating it this way resets the variable using its initial value
expression (using the defcustom's :set function if there is one), even
if the variable already has some other value.  \(Normally `defvar' and
`defcustom' do not alter the value if there already is one.)  In an
analogous way, evaluating a `defface' overrides any customizations of
the face, so that it becomes defined exactly as the `defface' expression
says.

If `eval-expression-debug-on-error' is non-nil, which is the default,
this command arranges for all errors to enter the debugger.

With a prefix argument, instrument the code for Edebug.

If acting on a `defun' for FUNCTION, and the function was
instrumented, `Edebug: FUNCTION' is printed in the echo area.  If not
instrumented, just FUNCTION is printed.

If not acting on a `defun', the result of evaluation is displayed in
the echo area.  This display is controlled by the variables
`eval-expression-print-length' and `eval-expression-print-level',
which see."
  (interactive "P")
  (cond (edebug-it
	 (require 'edebug)
	 (eval-defun (not edebug-all-defs)))
	(t
	 (if (null eval-expression-debug-on-error)
	     (elisp--eval-defun)
	   (let (new-value value)
	     (let ((debug-on-error elisp--eval-last-sexp-fake-value))
	       (setq value (elisp--eval-defun))
	       (setq new-value debug-on-error))
	     (unless (eq elisp--eval-last-sexp-fake-value new-value)
	       (setq debug-on-error new-value))
	     value)))))

;;; ElDoc Support

(defvar elisp--eldoc-last-data (make-vector 3 nil)
  "Bookkeeping; elements are as follows:
  0 - contains the last symbol read from the buffer.
  1 - contains the string last displayed in the echo area for variables,
      or argument string for functions.
  2 - 'function if function args, 'variable if variable documentation.")

(defun elisp-eldoc-documentation-function ()
  "`eldoc-documentation-function' (which see) for Emacs Lisp."
  (let ((current-symbol (elisp--current-symbol))
	(current-fnsym  (elisp--fnsym-in-current-sexp)))
    (cond ((null current-fnsym)
	   nil)
	  ((eq current-symbol (car current-fnsym))
	   (or (apply #'elisp--get-fnsym-args-string current-fnsym)
	       (elisp--get-var-docstring current-symbol)))
	  (t
	   (or (elisp--get-var-docstring current-symbol)
	       (apply #'elisp--get-fnsym-args-string current-fnsym))))))

(defun elisp--get-fnsym-args-string (sym &optional index)
  "Return a string containing the parameter list of the function SYM.
If SYM is a subr and no arglist is obtainable from the docstring
or elsewhere, return a 1-line docstring."
  (let ((argstring
	 (cond
	  ((not (and sym (symbolp sym) (fboundp sym))) nil)
	  ((and (eq sym (aref elisp--eldoc-last-data 0))
		(eq 'function (aref elisp--eldoc-last-data 2)))
	   (aref elisp--eldoc-last-data 1))
	  (t
	   (let* ((advertised (gethash (indirect-function sym)
                                       advertised-signature-table t))
                  doc
		  (args
		   (cond
		    ((listp advertised) advertised)
		    ((setq doc (help-split-fundoc (documentation sym t) sym))
		     (car doc))
		    (t (help-function-arglist sym)))))
             ;; Stringify, and store before highlighting, downcasing, etc.
             ;; FIXME should truncate before storing.
	     (elisp--last-data-store sym (elisp--function-argstring args)
                                    'function))))))
    ;; Highlight, truncate.
    (if argstring
	(elisp--highlight-function-argument sym argstring index))))

(defun elisp--highlight-function-argument (sym args index)
  "Highlight argument INDEX in ARGS list for function SYM.
In the absence of INDEX, just call `elisp--docstring-format-sym-doc'."
  ;; FIXME: This should probably work on the list representation of `args'
  ;; rather than its string representation.
  ;; FIXME: This function is much too long, we need to split it up!
  (let ((start          nil)
	(end            0)
	(argument-face  'eldoc-highlight-function-argument)
        (args-lst (mapcar (lambda (x)
                            (replace-regexp-in-string
                             "\\`[(]\\|[)]\\'" "" x))
                          (split-string args))))
    ;; Find the current argument in the argument string.  We need to
    ;; handle `&rest' and informal `...' properly.
    ;;
    ;; FIXME: What to do with optional arguments, like in
    ;;        (defun NAME ARGLIST [DOCSTRING] BODY...) case?
    ;;        The problem is there is no robust way to determine if
    ;;        the current argument is indeed a docstring.

    ;; When `&key' is used finding position based on `index'
    ;; would be wrong, so find the arg at point and determine
    ;; position in ARGS based on this current arg.
    (when (string-match "&key" args)
      (let* (case-fold-search
             key-have-value
             (sym-name (symbol-name sym))
             (cur-w (current-word))
             (args-lst-ak (cdr (member "&key" args-lst)))
             (limit (save-excursion
                      (when (re-search-backward sym-name nil t)
                        (match-end 0))))
             (cur-a (if (and cur-w (string-match ":\\([^ ()]*\\)" cur-w))
                        (substring cur-w 1)
                      (save-excursion
                        (let (split)
                          (when (re-search-backward ":\\([^()\n]*\\)" limit t)
                            (setq split (split-string (match-string 1) " " t))
                            (prog1 (car split)
                              (when (cdr split)
                                (setq key-have-value t))))))))
             ;; If `cur-a' is not one of `args-lst-ak'
             ;; assume user is entering an unknown key
             ;; referenced in last position in signature.
             (other-key-arg (and (stringp cur-a)
                                 args-lst-ak
                                 (not (member (upcase cur-a) args-lst-ak))
                                 (upcase (car (last args-lst-ak))))))
        (unless (string= cur-w sym-name)
          ;; The last keyword have already a value
          ;; i.e :foo a b and cursor is at b.
          ;; If signature have also `&rest'
          ;; (assume it is after the `&key' section)
          ;; go to the arg after `&rest'.
          (if (and key-have-value
                   (save-excursion
                     (not (re-search-forward ":.*" (point-at-eol) t)))
                   (string-match "&rest \\([^ ()]*\\)" args))
              (setq index nil ; Skip next block based on positional args.
                    start (match-beginning 1)
                    end   (match-end 1))
            ;; If `cur-a' is nil probably cursor is on a positional arg
            ;; before `&key', in this case, exit this block and determine
            ;; position with `index'.
            (when (and cur-a     ; A keyword arg (dot removed) or nil.
                       (or (string-match
                            (concat "\\_<" (upcase cur-a) "\\_>") args)
                           (string-match
                            (concat "\\_<" other-key-arg "\\_>") args)))
              (setq index nil ; Skip next block based on positional args.
                    start (match-beginning 0)
                    end   (match-end 0)))))))
    ;; Handle now positional arguments.
    (while (and index (>= index 1))
      (if (string-match "[^ ()]+" args end)
	  (progn
	    (setq start (match-beginning 0)
		  end   (match-end 0))
	    (let ((argument (match-string 0 args)))
	      (cond ((string= argument "&rest")
		     ;; All the rest arguments are the same.
		     (setq index 1))
		    ((string= argument "&optional"))         ; Skip.
                    ((string= argument "&allow-other-keys")) ; Skip.
                    ;; Back to index 0 in ARG1 ARG2 ARG2 ARG3 etc...
                    ;; like in `setq'.
		    ((or (and (string-match-p "\\.\\.\\.$" argument)
                              (string= argument (car (last args-lst))))
                         (and (string-match-p "\\.\\.\\.$"
                                              (substring args 1 (1- (length args))))
                              (= (length (remove "..." args-lst)) 2)
                              (> index 1) (eq (logand index 1) 1)))
                     (setq index 0))
		    (t
		     (setq index (1- index))))))
	(setq end           (length args)
	      start         (1- end)
	      argument-face 'font-lock-warning-face
	      index         0)))
    (let ((doc args))
      (when start
	(setq doc (copy-sequence args))
	(add-text-properties start end (list 'face argument-face) doc))
      (setq doc (elisp--docstring-format-sym-doc
		 sym doc (if (functionp sym) 'font-lock-function-name-face
                           'font-lock-keyword-face)))
      doc)))

;; Return a string containing a brief (one-line) documentation string for
;; the variable.
(defun elisp--get-var-docstring (sym)
  (cond ((not sym) nil)
        ((and (eq sym (aref elisp--eldoc-last-data 0))
              (eq 'variable (aref elisp--eldoc-last-data 2)))
         (aref elisp--eldoc-last-data 1))
        (t
         (let ((doc (documentation-property sym 'variable-documentation t)))
           (when doc
             (let ((doc (elisp--docstring-format-sym-doc
                         sym (elisp--docstring-first-line doc)
                         'font-lock-variable-name-face)))
               (elisp--last-data-store sym doc 'variable)))))))

(defun elisp--last-data-store (symbol doc type)
  (aset elisp--eldoc-last-data 0 symbol)
  (aset elisp--eldoc-last-data 1 doc)
  (aset elisp--eldoc-last-data 2 type)
  doc)

;; Note that any leading `*' in the docstring (which indicates the variable
;; is a user option) is removed.
(defun elisp--docstring-first-line (doc)
  (and (stringp doc)
       (substitute-command-keys
        (save-match-data
	  ;; Don't use "^" in the regexp below since it may match
	  ;; anywhere in the doc-string.
	  (let ((start (if (string-match "\\`\\*" doc) (match-end 0) 0)))
            (cond ((string-match "\n" doc)
                   (substring doc start (match-beginning 0)))
                  ((zerop start) doc)
                  (t (substring doc start))))))))

(defvar eldoc-echo-area-use-multiline-p)

;; If the entire line cannot fit in the echo area, the symbol name may be
;; truncated or eliminated entirely from the output to make room for the
;; description.
(defun elisp--docstring-format-sym-doc (sym doc face)
  (save-match-data
    (let* ((name (symbol-name sym))
           (ea-multi eldoc-echo-area-use-multiline-p)
           ;; Subtract 1 from window width since emacs will not write
           ;; any chars to the last column, or in later versions, will
           ;; cause a wraparound and resize of the echo area.
           (ea-width (1- (window-width (minibuffer-window))))
           (strip (- (+ (length name) (length ": ") (length doc)) ea-width)))
      (cond ((or (<= strip 0)
                 (eq ea-multi t)
                 (and ea-multi (> (length doc) ea-width)))
             (format "%s: %s" (propertize name 'face face) doc))
            ((> (length doc) ea-width)
             (substring (format "%s" doc) 0 ea-width))
            ((>= strip (length name))
             (format "%s" doc))
            (t
             ;; Show the end of the partial symbol name, rather
             ;; than the beginning, since the former is more likely
             ;; to be unique given package namespace conventions.
             (setq name (substring name strip))
             (format "%s: %s" (propertize name 'face face) doc))))))

\f
;; Return a list of current function name and argument index.
(defun elisp--fnsym-in-current-sexp ()
  (save-excursion
    (let ((argument-index (1- (elisp--beginning-of-sexp))))
      ;; If we are at the beginning of function name, this will be -1.
      (when (< argument-index 0)
	(setq argument-index 0))
      ;; Don't do anything if current word is inside a string.
      (if (= (or (char-after (1- (point))) 0) ?\")
	  nil
	(list (elisp--current-symbol) argument-index)))))

;; Move to the beginning of current sexp.  Return the number of nested
;; sexp the point was over or after.
(defun elisp--beginning-of-sexp ()
  (let ((parse-sexp-ignore-comments t)
	(num-skipped-sexps 0))
    (condition-case _
	(progn
	  ;; First account for the case the point is directly over a
	  ;; beginning of a nested sexp.
	  (condition-case _
	      (let ((p (point)))
		(forward-sexp -1)
		(forward-sexp 1)
		(when (< (point) p)
		  (setq num-skipped-sexps 1)))
	    (error))
	  (while
	      (let ((p (point)))
		(forward-sexp -1)
		(when (< (point) p)
		  (setq num-skipped-sexps (1+ num-skipped-sexps))))))
      (error))
    num-skipped-sexps))

;; returns nil unless current word is an interned symbol.
(defun elisp--current-symbol ()
  (let ((c (char-after (point))))
    (and c
         (memq (char-syntax c) '(?w ?_))
         (intern-soft (current-word)))))

(defun elisp--function-argstring (arglist)
  "Return ARGLIST as a string enclosed by ().
ARGLIST is either a string, or a list of strings or symbols."
  (let ((str (cond ((stringp arglist) arglist)
                   ((not (listp arglist)) nil)
                   (t (format "%S" (help-make-usage 'toto arglist))))))
    (if (and str (string-match "\\`([^ )]+ ?" str))
        (replace-match "(" t t str)
      str)))

(provide 'elisp-mode)
;;; elisp-mode.el ends here

debug log:

solving 42e946c ...
found 42e946c in https://yhetil.org/emacs/87r3techrj.fsf@yahoo.fr/
found b2c5fbf in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 b2c5fbfe60ee3f0fbf038411dbbd11ad49db084c	lisp/progmodes/elisp-mode.el

applying [1/1] https://yhetil.org/emacs/87r3techrj.fsf@yahoo.fr/
diff --git a/lisp/progmodes/elisp-mode.el b/lisp/progmodes/elisp-mode.el
index b2c5fbf..42e946c 100644

Checking patch lisp/progmodes/elisp-mode.el...
Applied patch lisp/progmodes/elisp-mode.el cleanly.

index at:
100644 42e946cfcf6f4377aabd769d0243df42bb47d1c0	lisp/progmodes/elisp-mode.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 external index

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

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.