unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob 9c8c38fb835758797f4d399f81573e61acadd22b 54483 bytes (raw)
name: lisp/tab-bar.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
 
;;; tab-bar.el --- frame-local tabs with named persistent window configurations -*- lexical-binding: t; -*-

;; Copyright (C) 2019 Free Software Foundation, Inc.

;; Author: Juri Linkov <juri@linkov.net>
;; Keywords: frames tabs
;; Maintainer: emacs-devel@gnu.org

;; 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 <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Provides `tab-bar-mode' to control display of the tab bar and
;; bindings for the global tab bar.

;; The normal global binding for [tab-bar] (below) uses the value of
;; `tab-bar-map' as the actual keymap to define the tab bar.  Modes
;; may either bind items under the [tab-bar] prefix key of the local
;; map to add to the global bar or may set `tab-bar-map'
;; buffer-locally to override it.

;;; Code:

(eval-when-compile
  (require 'cl-lib)
  (require 'seq))

\f
(defgroup tab-bar nil
  "Frame-local tabs."
  :group 'convenience
  :version "27.1")

(defgroup tab-bar-faces nil
  "Faces used in the tab bar."
  :group 'tab-bar
  :group 'faces
  :version "27.1")

(defface tab-bar
  '((((type x w32 ns) (class color))
     :inherit variable-pitch
     :background "grey85"
     :foreground "black")
    (((type x) (class mono))
     :background "grey")
    (t
     :inverse-video t))
  "Tab bar face."
  :version "27.1"
  :group 'tab-bar-faces)

(defface tab-bar-tab
  '((default
      :inherit tab-bar)
    (((class color) (min-colors 88))
     :box (:line-width 1 :style released-button))
    (t
     :inverse-video nil))
  "Tab bar face for selected tab."
  :version "27.1"
  :group 'tab-bar-faces)

(defface tab-bar-tab-inactive
  '((default
      :inherit tab-bar-tab)
    (((class color) (min-colors 88))
     :background "grey75")
    (t
     :inverse-video t))
  "Tab bar face for non-selected tab."
  :version "27.1"
  :group 'tab-bar-faces)

\f
(defcustom tab-bar-select-tab-modifiers '()
  "List of key modifiers for selecting a tab by its index digit.
Possible modifiers are `control', `meta', `shift', `hyper', `super' and
`alt'."
  :type '(set :tag "Tab selection key modifiers"
              (const control)
              (const meta)
              (const shift)
              (const hyper)
              (const super)
              (const alt))
  :initialize 'custom-initialize-default
  :set (lambda (sym val)
         (set-default sym val)
         ;; Reenable the tab-bar with new keybindings
         (tab-bar-mode -1)
         (tab-bar-mode 1))
  :group 'tab-bar
  :version "27.1")

\f
(define-minor-mode tab-bar-mode
  "Toggle the tab bar in all graphical frames (Tab Bar mode)."
  :global t
  ;; It's defined in C/cus-start, this stops the d-m-m macro defining it again.
  :variable tab-bar-mode
  (let ((val (if tab-bar-mode 1 0)))
    (dolist (frame (frame-list))
      (set-frame-parameter frame 'tab-bar-lines val))
    ;; If the user has given `default-frame-alist' a `tab-bar-lines'
    ;; parameter, replace it.
    (if (assq 'tab-bar-lines default-frame-alist)
        (setq default-frame-alist
              (cons (cons 'tab-bar-lines val)
                    (assq-delete-all 'tab-bar-lines
                                     default-frame-alist)))))

  (when (and tab-bar-mode (not (get-text-property 0 'display tab-bar-new-button)))
    ;; This file is pre-loaded so only here we can use the right data-directory:
    (add-text-properties 0 (length tab-bar-new-button)
                         `(display (image :type xpm
                                          :file "tabs/new.xpm"
                                          :margin (2 . 0)
                                          :ascent center))
                         tab-bar-new-button))

  (when (and tab-bar-mode (not (get-text-property 0 'display tab-bar-close-button)))
    ;; This file is pre-loaded so only here we can use the right data-directory:
    (add-text-properties 0 (length tab-bar-close-button)
                         `(display (image :type xpm
                                          :file "tabs/close.xpm"
                                          :margin (2 . 0)
                                          :ascent center))
                         tab-bar-close-button))

  (if tab-bar-mode
      (progn
        (when tab-bar-select-tab-modifiers
          (dotimes (i 9)
            (global-set-key (vector (append tab-bar-select-tab-modifiers
                                            (list (+ i 1 ?0))))
                            'tab-bar-select-tab)))
        ;; Don't override user customized key bindings
        (unless (global-key-binding [(control tab)])
          (global-set-key [(control tab)] 'tab-next))
        (unless (global-key-binding [(control shift tab)])
          (global-set-key [(control shift tab)] 'tab-previous))
        (unless (global-key-binding [(control shift iso-lefttab)])
          (global-set-key [(control shift iso-lefttab)] 'tab-previous)))
    ;; Unset only keys bound by tab-bar
    (when (eq (global-key-binding [(control tab)]) 'tab-next)
      (global-unset-key [(control tab)]))
    (when (eq (global-key-binding [(control shift tab)]) 'tab-previous)
      (global-unset-key [(control shift tab)]))
    (when (eq (global-key-binding [(control shift iso-lefttab)]) 'tab-previous)
      (global-unset-key [(control shift iso-lefttab)]))))

(defun tab-bar-handle-mouse (event)
  "Text-mode emulation of switching tabs on the tab bar.
This command is used when you click the mouse in the tab bar
on a console which has no window system but does have a mouse."
  (interactive "e")
  (let* ((x-position (car (posn-x-y (event-start event))))
         (keymap (lookup-key (cons 'keymap (nreverse (current-active-maps))) [tab-bar]))
         (column 0))
    (when x-position
      (unless (catch 'done
                (map-keymap
                 (lambda (_key binding)
                   (when (eq (car-safe binding) 'menu-item)
                     (when (> (+ column (length (nth 1 binding))) x-position)
                       ;; TODO: handle close
                       (unless (get-text-property (- x-position column) 'close-tab (nth 1 binding))
                         (call-interactively (nth 2 binding)))
                       (throw 'done t))
                     (setq column (+ column (length (nth 1 binding))))))
                 keymap))
        ;; Clicking anywhere outside existing tabs will add a new tab
        (tab-bar-new-tab)))))

;; Used in the Show/Hide menu, to have the toggle reflect the current frame.
(defun toggle-tab-bar-mode-from-frame (&optional arg)
  "Toggle tab bar on or off, based on the status of the current frame.
See `tab-bar-mode' for more information."
  (interactive (list (or current-prefix-arg 'toggle)))
  (if (eq arg 'toggle)
      (tab-bar-mode (if (> (frame-parameter nil 'tab-bar-lines) 0) 0 1))
    (tab-bar-mode arg)))

(defvar tab-bar-map (make-sparse-keymap)
  "Keymap for the tab bar.
Define this locally to override the global tab bar.")

(global-set-key [tab-bar]
                `(menu-item ,(purecopy "tab bar") ignore
                            :filter tab-bar-make-keymap))

(defconst tab-bar-keymap-cache (make-hash-table :weakness t :test 'equal))

(defun tab-bar-make-keymap (&optional _ignore)
  "Generate an actual keymap from `tab-bar-map'.
Its main job is to show tabs in the tab bar."
  (if (= 1 (length tab-bar-map))
      (tab-bar-make-keymap-1)
    (let ((key (cons (frame-terminal) tab-bar-map)))
      (or (gethash key tab-bar-keymap-cache)
          (puthash key tab-bar-map tab-bar-keymap-cache)))))

\f
(defcustom tab-bar-show t
  "Defines when to show the tab bar.
If t, enable `tab-bar-mode' automatically on using the commands that
create new window configurations (e.g. `tab-new').
If the value is `1', then hide the tab bar when it has only one tab,
and show it again once more tabs are created.
If nil, always keep the tab bar hidden.  In this case it's still
possible to use persistent named window configurations by relying on
keyboard commands `tab-list', `tab-new', `tab-close', `tab-next', etc."
  :type '(choice (const :tag "Always" t)
                 (const :tag "When more than one tab" 1)
                 (const :tag "Never" nil))
  :initialize 'custom-initialize-default
  :set (lambda (sym val)
         (set-default sym val)
         (tab-bar-mode
          (if (or (eq val t)
                  (and (natnump val)
                       (> (length (funcall tab-bar-tabs-function)) val)))
              1 -1)))
  :group 'tab-bar
  :version "27.1")

(defcustom tab-bar-new-tab-choice t
  "Defines what to show in a new tab.
If t, start a new tab with the current buffer, i.e. the buffer
that was current before calling the command that adds a new tab
(this is the same what `make-frame' does by default).
If the value is a string, use it as a buffer name switch to a buffer
if such buffer exists, or switch to a buffer visiting the file or
directory that the string specifies.  If the value is a function,
call it with no arguments and switch to the buffer that it returns.
If nil, duplicate the contents of the tab that was active
before calling the command that adds a new tab."
  :type '(choice (const     :tag "Current buffer" t)
                 (string    :tag "Buffer" "*scratch*")
                 (directory :tag "Directory" :value "~/")
                 (file      :tag "File" :value "~/.emacs")
                 (function  :tag "Function")
                 (const     :tag "Duplicate tab" nil))
  :group 'tab-bar
  :version "27.1")

(defvar tab-bar-new-button " + "
  "Button for creating a new tab.")

(defcustom tab-bar-close-button-show t
  "Defines where to show the close tab button.
If t, show the close tab button on all tabs.
If `selected', show it only on the selected tab.
If `non-selected', show it only on non-selected tab.
If nil, don't show it at all."
  :type '(choice (const :tag "On all tabs" t)
                 (const :tag "On selected tab" selected)
                 (const :tag "On non-selected tabs" non-selected)
                 (const :tag "None" nil))
  :initialize 'custom-initialize-default
  :set (lambda (sym val)
         (set-default sym val)
         (force-mode-line-update))
  :group 'tab-bar
  :version "27.1")

(defvar tab-bar-close-button
  (propertize " x"
              'close-tab t
              :help "Click to close tab")
  "Button for closing the clicked tab.")

(defvar tab-bar-back-button " < "
  "Button for going back in tab history.")

(defvar tab-bar-forward-button " > "
  "Button for going forward in tab history.")

(defcustom tab-bar-tab-hints nil
  "Show absolute numbers on tabs in the tab bar before the tab name.
This helps to select the tab by its number using `tab-bar-select-tab'."
  :type 'boolean
  :initialize 'custom-initialize-default
  :set (lambda (sym val)
         (set-default sym val)
         (force-mode-line-update))
  :group 'tab-bar
  :version "27.1")

(defvar tab-bar-separator nil)

\f
(defcustom tab-bar-tab-name-function #'tab-bar-tab-name-current
  "Function to get a tab name.
Function gets no arguments.
The choice is between displaying only the name of the current buffer
in the tab name (default), or displaying the names of all buffers
from all windows in the window configuration."
  :type '(choice (const :tag "Selected window buffer"
                        tab-bar-tab-name-current)
                 (const :tag "Selected window buffer with window count"
                        tab-bar-tab-name-current-with-count)
                 (const :tag "All window buffers"
                        tab-bar-tab-name-all)
                 (function  :tag "Function"))
  :initialize 'custom-initialize-default
  :set (lambda (sym val)
         (set-default sym val)
         (force-mode-line-update))
  :group 'tab-bar
  :version "27.1")

(defun tab-bar-tab-name-current ()
  "Generate tab name from the buffer of the selected window."
  (buffer-name (window-buffer (minibuffer-selected-window))))

(defun tab-bar-tab-name-current-with-count ()
  "Generate tab name from the buffer of the selected window.
Also add the number of windows in the window configuration."
  (let ((count (length (window-list-1 nil 'nomini)))
        (name (window-buffer (minibuffer-selected-window))))
    (if (> count 1)
        (format "%s (%d)" name count)
      (format "%s" name))))

(defun tab-bar-tab-name-all ()
  "Generate tab name from buffers of all windows."
  (mapconcat #'buffer-name
             (delete-dups (mapcar #'window-buffer
                                  (window-list-1 (frame-first-window)
                                                 'nomini)))
             ", "))

\f
(defvar tab-bar-tabs-function #'tab-bar-tabs
  "Function to get a list of tabs to display in the tab bar.
This function should return a list of alists with parameters
that include at least the element (name . TAB-NAME).
For example, \\='((tab (name . \"Tab 1\")) (current-tab (name . \"Tab 2\")))
By default, use function `tab-bar-tabs'.")

(defun tab-bar-tabs ()
  "Return a list of tabs belonging to the selected frame.
Ensure the frame parameter `tabs' is pre-populated.
Update the current tab name when it exists.
Return its existing value or a new value."
  (let ((tabs (frame-parameter nil 'tabs)))
    (if tabs
        (let* ((current-tab (assq 'current-tab tabs))
               (current-tab-name (assq 'name current-tab))
               (current-tab-explicit-name (assq 'explicit-name current-tab)))
          (when (and current-tab-name
                     current-tab-explicit-name
                     (not (cdr current-tab-explicit-name)))
            (setf (cdr current-tab-name)
                  (funcall tab-bar-tab-name-function))))
      ;; Create default tabs
      (setq tabs (list (tab-bar--current-tab)))
      (set-frame-parameter nil 'tabs tabs))
    tabs))

\f
(defun tab-bar-make-keymap-1 ()
  "Generate an actual keymap from `tab-bar-map', without caching."
  (let* ((separator (or tab-bar-separator (if window-system " " "|")))
         (i 0)
         (tabs (funcall tab-bar-tabs-function)))
    (append
     '(keymap (mouse-1 . tab-bar-handle-mouse))
     (when tab-bar-history-mode
       `((sep-history-back menu-item ,separator ignore)
         (history-back
          menu-item ,tab-bar-back-button tab-bar-history-back
          :help "Click to go back in tab history")
         (sep-history-forward menu-item ,separator ignore)
         (history-forward
          menu-item ,tab-bar-forward-button tab-bar-history-forward
          :help "Click to go forward in tab history")))
     (mapcan
      (lambda (tab)
        (setq i (1+ i))
        (append
         `((,(intern (format "sep-%i" i)) menu-item ,separator ignore))
         (cond
          ((eq (car tab) 'current-tab)
           `((current-tab
              menu-item
              ,(propertize (concat (if tab-bar-tab-hints (format "%d " i) "")
                                   (cdr (assq 'name tab))
                                   (or (and tab-bar-close-button-show
                                            (not (eq tab-bar-close-button-show
                                                     'non-selected))
                                            tab-bar-close-button) ""))
                           'face 'tab-bar-tab)
              ignore
              :help "Current tab")))
          (t
           `((,(intern (format "tab-%i" i))
              menu-item
              ,(propertize (concat (if tab-bar-tab-hints (format "%d " i) "")
                                   (cdr (assq 'name tab))
                                   (or (and tab-bar-close-button-show
                                            (not (eq tab-bar-close-button-show
                                                     'selected))
                                            tab-bar-close-button) ""))
                           'face 'tab-bar-tab-inactive)
              ,(or
                (cdr (assq 'binding tab))
                `(lambda ()
                   (interactive)
                   (tab-bar-select-tab ,i)))
              :help "Click to visit tab"))))
         `((,(if (eq (car tab) 'current-tab) 'C-current-tab (intern (format "C-tab-%i" i)))
            menu-item ""
            ,(or
              (cdr (assq 'close-binding tab))
              `(lambda ()
                 (interactive)
                 (tab-bar-close-tab ,i)))))))
      tabs)
     (when tab-bar-new-button
       `((sep-add-tab menu-item ,separator ignore)
         (add-tab menu-item ,tab-bar-new-button tab-bar-new-tab
                  :help "New tab"))))))

\f
;; Some window-configuration parameters don't need to be persistent.
;; Don't save to the desktop file such tab parameters that are saved
;; as "Unprintable entity" so can't be used after restoring the desktop.
;; Actually tab-bar-select-tab already can handle unprintable entities,
;; but it's better not to waste the desktop file with useless data.
(defun frameset-filter-tabs (current _filtered _parameters saving)
  (if saving
      (mapcar (lambda (current)
                (if (consp current)
                    (seq-reduce (lambda (current param)
                                  (assq-delete-all param current))
                                '(wc wc-point wc-bl wc-bbl wc-history-back wc-history-forward)
                                (copy-sequence current))
                  current))
              current)
    current))

(push '(tabs . frameset-filter-tabs) frameset-filter-alist)

(defun tab-bar--tab ()
  (let* ((tab (assq 'current-tab (frame-parameter nil 'tabs)))
         (tab-explicit-name (cdr (assq 'explicit-name tab)))
         (bl  (seq-filter #'buffer-live-p (frame-parameter nil 'buffer-list)))
         (bbl (seq-filter #'buffer-live-p (frame-parameter nil 'buried-buffer-list))))
    `(tab
      (name . ,(if tab-explicit-name
                   (cdr (assq 'name tab))
                 (funcall tab-bar-tab-name-function)))
      (explicit-name . ,tab-explicit-name)
      (time . ,(time-convert nil 'integer))
      (ws . ,(window-state-get
              (frame-root-window (selected-frame)) 'writable))
      (wc . ,(current-window-configuration))
      (wc-point . ,(point-marker))
      (wc-bl . ,bl)
      (wc-bbl . ,bbl)
      (wc-history-back . ,(gethash (selected-frame) tab-bar-history-back))
      (wc-history-forward . ,(gethash (selected-frame) tab-bar-history-forward)))))

(defun tab-bar--current-tab (&optional tab)
  ;; `tab` here is an argument meaning 'use tab as template'. This is
  ;; necessary when switching tabs, otherwise the destination tab
  ;; inherit the current tab's `explicit-name` parameter.
  (let* ((tab (or tab (assq 'current-tab (frame-parameter nil 'tabs))))
         (tab-explicit-name (cdr (assq 'explicit-name tab))))
    `(current-tab
      (name . ,(if tab-explicit-name
                   (cdr (assq 'name tab))
                 (funcall tab-bar-tab-name-function)))
      (explicit-name . ,tab-explicit-name))))

(defun tab-bar--current-tab-index (&optional tabs)
  (seq-position (or tabs (funcall tab-bar-tabs-function))
                'current-tab (lambda (a b) (eq (car a) b))))

(defun tab-bar--tab-index (tab &optional tabs)
  (seq-position (or tabs (funcall tab-bar-tabs-function))
                tab))

(defun tab-bar--tab-index-by-name (name &optional tabs)
  (seq-position (or tabs (funcall tab-bar-tabs-function))
                name (lambda (a b) (equal (cdr (assq 'name a)) b))))

(defun tab-bar--tab-index-recent (nth &optional tabs)
  (let* ((tabs (or tabs (funcall tab-bar-tabs-function)))
         (sorted-tabs
          (seq-sort-by (lambda (tab) (cdr (assq 'time tab))) #'>
                       (seq-remove (lambda (tab)
                                     (eq (car tab) 'current-tab))
                                   tabs)))
         (tab (nth (1- nth) sorted-tabs)))
    (tab-bar--tab-index tab tabs)))

\f
(defun tab-bar-select-tab (&optional arg)
  "Switch to the tab by its absolute position ARG in the tab bar.
When this command is bound to a numeric key (with a prefix or modifier),
calling it without an argument will translate its bound numeric key
to the numeric argument.  ARG counts from 1."
  (interactive "P")
  (unless (integerp arg)
    (let ((key (event-basic-type last-command-event)))
      (setq arg (if (and (characterp key) (>= key ?1) (<= key ?9))
                    (- key ?0)
                  1))))

  (let* ((tabs (funcall tab-bar-tabs-function))
         (from-index (tab-bar--current-tab-index tabs))
         (to-index (1- (max 1 (min arg (length tabs))))))
    (unless (eq from-index to-index)
      (let* ((from-tab (tab-bar--tab))
             (to-tab (nth to-index tabs))
             (wc (cdr (assq 'wc to-tab)))
             (ws (cdr (assq 'ws to-tab))))

        ;; During the same session, use window-configuration to switch
        ;; tabs, because window-configurations are more reliable
        ;; (they keep references to live buffers) than window-states.
        ;; But after restoring tabs from a previously saved session,
        ;; its value of window-configuration is unreadable,
        ;; so restore its saved window-state.
        (cond
         ((window-configuration-p wc)
          (let ((wc-point (cdr (assq 'wc-point to-tab)))
                (wc-bl  (seq-filter #'buffer-live-p (cdr (assq 'wc-bl to-tab))))
                (wc-bbl (seq-filter #'buffer-live-p (cdr (assq 'wc-bbl to-tab))))
                (wc-history-back (cdr (assq 'wc-history-back to-tab)))
                (wc-history-forward (cdr (assq 'wc-history-forward to-tab))))

            (set-window-configuration wc)

            ;; set-window-configuration does not restore the value of
            ;; point in the current buffer, so restore it separately.
            (when (and (markerp wc-point)
                       (marker-buffer wc-point)
                       ;; FIXME: After dired-revert, marker relocates to 1.
                       ;; window-configuration restores point to global point
                       ;; in this dired buffer, not to its window point,
                       ;; but this is slightly better than 1.
                       ;; Maybe better to save dired-filename in each window?
                       (not (eq 1 (marker-position wc-point))))
              (goto-char wc-point))

            (when wc-bl  (set-frame-parameter nil 'buffer-list wc-bl))
            (when wc-bbl (set-frame-parameter nil 'buried-buffer-list wc-bbl))

            (puthash (selected-frame)
                     (and (window-configuration-p (cdr (assq 'wc (car wc-history-back))))
                          wc-history-back)
                     tab-bar-history-back)
            (puthash (selected-frame)
                     (and (window-configuration-p (cdr (assq 'wc (car wc-history-forward))))
                          wc-history-forward)
                     tab-bar-history-forward)))

         (ws
          (window-state-put ws (frame-root-window (selected-frame)) 'safe)))

        (setq tab-bar-history-omit t)

        (when from-index
          (setf (nth from-index tabs) from-tab))
        (setf (nth to-index tabs) (tab-bar--current-tab (nth to-index tabs))))

      (force-mode-line-update))))

(defun tab-bar-switch-to-next-tab (&optional arg)
  "Switch to ARGth next tab."
  (interactive "p")
  (unless (integerp arg)
    (setq arg 1))
  (let* ((tabs (funcall tab-bar-tabs-function))
         (from-index (or (tab-bar--current-tab-index tabs) 0))
         (to-index (mod (+ from-index arg) (length tabs))))
    (tab-bar-select-tab (1+ to-index))))

(defun tab-bar-switch-to-prev-tab (&optional arg)
  "Switch to ARGth previous tab."
  (interactive "p")
  (unless (integerp arg)
    (setq arg 1))
  (tab-bar-switch-to-next-tab (- arg)))

(defun tab-bar-switch-to-recent-tab (&optional arg)
  "Switch to ARGth most recently visited tab."
  (interactive "p")
  (unless (integerp arg)
    (setq arg 1))
  (let ((tab-index (tab-bar--tab-index-recent arg)))
    (if tab-index
        (tab-bar-select-tab (1+ tab-index))
      (message "No more recent tabs"))))

(defun tab-bar-switch-to-tab (name)
  "Switch to the tab by NAME."
  (interactive (list (completing-read "Switch to tab by name: "
                                      (mapcar (lambda (tab)
                                                (cdr (assq 'name tab)))
                                              (funcall tab-bar-tabs-function)))))
  (tab-bar-select-tab (1+ (tab-bar--tab-index-by-name name))))

(defalias 'tab-bar-select-tab-by-name 'tab-bar-switch-to-tab)

\f
(defun tab-bar-move-tab-to (to-index &optional from-index)
  "Move tab from FROM-INDEX position to new position at TO-INDEX.
FROM-INDEX defaults to the current tab index.
FROM-INDEX and TO-INDEX count from 1."
  (interactive "P")
  (let* ((tabs (funcall tab-bar-tabs-function))
         (from-index (or from-index (1+ (tab-bar--current-tab-index tabs))))
         (from-tab (nth (1- from-index) tabs))
         (to-index (max 0 (min (1- (or to-index 1)) (1- (length tabs))))))
    (setq tabs (delq from-tab tabs))
    (cl-pushnew from-tab (nthcdr to-index tabs))
    (set-frame-parameter nil 'tabs tabs)
    (force-mode-line-update)))

(defun tab-bar-move-tab (&optional arg)
  "Move the current tab ARG positions to the right.
If a negative ARG, move the current tab ARG positions to the left."
  (interactive "p")
  (let* ((tabs (funcall tab-bar-tabs-function))
         (from-index (or (tab-bar--current-tab-index tabs) 0))
         (to-index (mod (+ from-index arg) (length tabs))))
    (tab-bar-move-tab-to (1+ to-index) (1+ from-index))))

\f
(defcustom tab-bar-new-tab-to 'right
  "Defines where to create a new tab.
If `leftmost', create as the first tab.
If `left', create to the left from the current tab.
If `right', create to the right from the current tab.
If `rightmost', create as the last tab."
  :type '(choice (const :tag "First tab" leftmost)
                 (const :tag "To the left" left)
                 (const :tag "To the right" right)
                 (const :tag "Last tab" rightmost))
  :group 'tab-bar
  :version "27.1")

(defun tab-bar-new-tab-to (&optional to-index)
  "Add a new tab at the absolute position TO-INDEX.
TO-INDEX counts from 1.  If no TO-INDEX is specified, then add
a new tab at the position specified by `tab-bar-new-tab-to'."
  (interactive "P")
  (let* ((tabs (funcall tab-bar-tabs-function))
         (from-index (tab-bar--current-tab-index tabs))
         (from-tab (tab-bar--tab)))

    (when tab-bar-new-tab-choice
      (delete-other-windows)
      ;; Create a new window to get rid of old window parameters
      ;; (e.g. prev/next buffers) of old window.
      (split-window) (delete-window)
      (let ((buffer
             (if (functionp tab-bar-new-tab-choice)
                 (funcall tab-bar-new-tab-choice)
               (if (stringp tab-bar-new-tab-choice)
                   (or (get-buffer tab-bar-new-tab-choice)
                       (find-file-noselect tab-bar-new-tab-choice))))))
        (when (buffer-live-p buffer)
          (switch-to-buffer buffer))))

    (when from-index
      (setf (nth from-index tabs) from-tab))
    (let ((to-tab (tab-bar--current-tab))
          (to-index (or (if to-index (1- to-index))
                        (pcase tab-bar-new-tab-to
                          ('leftmost 0)
                          ('rightmost (length tabs))
                          ('left (1- (or from-index 1)))
                          ('right (1+ (or from-index 0)))))))
      (setq to-index (max 0 (min (or to-index 0) (length tabs))))
      (cl-pushnew to-tab (nthcdr to-index tabs))
      (when (eq to-index 0)
        ;; pushnew handles the head of tabs but not frame-parameter
        (set-frame-parameter nil 'tabs tabs)))

    (when (and (not tab-bar-mode)
               (or (eq tab-bar-show t)
                   (and (natnump tab-bar-show)
                        (> (length tabs) tab-bar-show))))
      (tab-bar-mode 1))

    (force-mode-line-update)
    (unless tab-bar-mode
      (message "Added new tab at %s" tab-bar-new-tab-to))))

(defun tab-bar-new-tab (&optional arg)
  "Create a new tab ARG positions to the right.
If a negative ARG, create a new tab ARG positions to the left.
If ARG is zero, create a new tab in place of the current tab."
  (interactive "P")
  (if arg
      (let* ((tabs (funcall tab-bar-tabs-function))
             (from-index (or (tab-bar--current-tab-index tabs) 0))
             (to-index (+ from-index (prefix-numeric-value arg))))
        (tab-bar-new-tab-to (1+ to-index)))
    (tab-bar-new-tab-to)))

\f
(defvar tab-bar-closed-tabs nil
  "A list of closed tabs to be able to undo their closing.")

(defcustom tab-bar-close-tab-select 'recent
  "Defines what tab to select after closing the specified tab.
If `left', select the adjacent left tab.
If `right', select the adjacent right tab.
If `recent', select the most recently visited tab."
  :type '(choice (const :tag "Select left tab" left)
                 (const :tag "Select right tab" right)
                 (const :tag "Select recent tab" recent))
  :group 'tab-bar
  :version "27.1")

(defcustom tab-bar-close-last-tab-choice nil
  "Defines what to do when the last tab is closed.
If nil, do nothing and show a message, like closing the last window or frame.
If `delete-frame', delete the containing frame, as a web browser would do.
If `tab-bar-mode-disable', disable tab-bar-mode so that tabs no longer show in the frame.
If the value is a function, call that function with the tab to be closed as an argument."
  :type '(choice (const    :tag "Do nothing and show message" nil)
                 (const    :tag "Close the containing frame" delete-frame)
                 (const    :tag "Disable tab-bar-mode" tab-bar-mode-disable)
                 (function :tag "Function"))
  :group 'tab-bar
  :version "27.1")

(defun tab-bar-close-tab (&optional arg to-index)
  "Close the tab specified by its absolute position ARG.
If no ARG is specified, then close the current tab and switch
to the tab specified by `tab-bar-close-tab-select'.
ARG counts from 1.
Optional TO-INDEX could be specified to override the value of
`tab-bar-close-tab-select' programmatically with a position
of an existing tab to select after closing the current tab.
TO-INDEX counts from 1."
  (interactive "P")
  (let* ((tabs (funcall tab-bar-tabs-function))
         (current-index (tab-bar--current-tab-index tabs))
         (close-index (if (integerp arg) (1- arg) current-index)))
    (if (= 1 (length tabs))
        (pcase tab-bar-close-last-tab-choice
          ('nil
           (signal 'user-error '("Attempt to delete the sole tab in a frame")))
          ('delete-frame
           (delete-frame))
          ('tab-bar-mode-disable
           (tab-bar-mode -1))
          ((pred functionp)
           ;; Give the handler function the full extent of the tab's
           ;; data, not just it's name and explicit-name flag.
           (funcall tab-bar-close-last-tab-choice (tab-bar--tab))))

      ;; More than one tab still open
      (when (eq current-index close-index)
        ;; Select another tab before deleting the current tab
        (let ((to-index (or (if to-index (1- to-index))
                            (pcase tab-bar-close-tab-select
                              ('left (1- current-index))
                              ('right (if (> (length tabs) (1+ current-index))
                                          (1+ current-index)
                                        (1- current-index)))
                              ('recent (tab-bar--tab-index-recent 1 tabs))))))
          (setq to-index (max 0 (min (or to-index 0) (1- (length tabs)))))
          (tab-bar-select-tab (1+ to-index))
          ;; Re-read tabs after selecting another tab
          (setq tabs (funcall tab-bar-tabs-function))))

      (let ((close-tab (nth close-index tabs)))
        (push `((frame . ,(selected-frame))
                (index . ,close-index)
                (tab . ,(if (eq (car close-tab) 'current-tab)
                            (tab-bar--tab)
                          close-tab)))
              tab-bar-closed-tabs)
        (set-frame-parameter nil 'tabs (delq close-tab tabs)))

      (when (and tab-bar-mode
                 (and (natnump tab-bar-show)
                      (<= (length tabs) tab-bar-show)))
        (tab-bar-mode -1))

      (force-mode-line-update)
      (unless tab-bar-mode
        (message "Deleted tab and switched to %s" tab-bar-close-tab-select)))))

(defun tab-bar-close-tab-by-name (name)
  "Close the tab by NAME."
  (interactive (list (completing-read "Close tab by name: "
                                      (mapcar (lambda (tab)
                                                (cdr (assq 'name tab)))
                                              (funcall tab-bar-tabs-function)))))
  (tab-bar-close-tab (1+ (tab-bar--tab-index-by-name name))))

(defun tab-bar-close-other-tabs ()
  "Close all tabs on the selected frame, except the selected one."
  (interactive)
  (let* ((tabs (funcall tab-bar-tabs-function))
         (current-index (tab-bar--current-tab-index tabs)))
    (when current-index
      (dotimes (index (length tabs))
        (unless (eq index current-index)
          (push `((frame . ,(selected-frame))
                  (index . ,index)
                  (tab . ,(nth index tabs)))
                tab-bar-closed-tabs)))
      (set-frame-parameter nil 'tabs (list (nth current-index tabs)))

      (when (and tab-bar-mode
                 (and (natnump tab-bar-show)
                      (<= 1 tab-bar-show)))
        (tab-bar-mode -1))

      (force-mode-line-update)
      (unless tab-bar-mode
        (message "Deleted all other tabs")))))

(defun tab-bar-undo-close-tab ()
  "Restore the last closed tab."
  (interactive)
  ;; Pop out closed tabs that were on already deleted frames
  (while (and tab-bar-closed-tabs
              (not (frame-live-p (cdr (assq 'frame (car tab-bar-closed-tabs))))))
    (pop tab-bar-closed-tabs))

  (if tab-bar-closed-tabs
      (let* ((closed (pop tab-bar-closed-tabs))
             (frame (cdr (assq 'frame closed)))
             (index (cdr (assq 'index closed)))
             (tab (cdr (assq 'tab closed))))
        (unless (eq frame (selected-frame))
          (select-frame-set-input-focus frame))

        (let ((tabs (tab-bar-tabs)))
          (setq index (max 0 (min index (length tabs))))
          (cl-pushnew tab (nthcdr index tabs))
          (when (eq index 0)
            ;; pushnew handles the head of tabs but not frame-parameter
            (set-frame-parameter nil 'tabs tabs))
          (tab-bar-select-tab (1+ index))))

    (message "No more closed tabs to undo")))

\f
(defun tab-bar-rename-tab (name &optional arg)
  "Rename the tab specified by its absolute position ARG.
If no ARG is specified, then rename the current tab.
ARG counts from 1.
If NAME is the empty string, then use the automatic name
function `tab-bar-tab-name-function'."
  (interactive
   (let* ((tabs (funcall tab-bar-tabs-function))
          (tab-index (or current-prefix-arg (1+ (tab-bar--current-tab-index tabs))))
          (tab-name (cdr (assq 'name (nth (1- tab-index) tabs)))))
     (list (read-from-minibuffer
            "New name for tab (leave blank for automatic naming): "
            nil nil nil nil tab-name)
           current-prefix-arg)))
  (let* ((tabs (funcall tab-bar-tabs-function))
         (tab-index (if arg
                        (1- (max 0 (min arg (length tabs))))
                      (tab-bar--current-tab-index tabs)))
         (tab-to-rename (nth tab-index tabs))
         (tab-explicit-name (> (length name) 0))
         (tab-new-name (if tab-explicit-name
                           name
                         (funcall tab-bar-tab-name-function))))
    (setf (cdr (assq 'name tab-to-rename)) tab-new-name
          (cdr (assq 'explicit-name tab-to-rename)) tab-explicit-name)

    (force-mode-line-update)
    (unless tab-bar-mode
      (message "Renamed tab to '%s'" tab-new-name))))

(defun tab-bar-rename-tab-by-name (tab-name new-name)
  "Rename the tab named TAB-NAME.
If NEW-NAME is the empty string, then use the automatic name
function `tab-bar-tab-name-function'."
  (interactive
   (let ((tab-name (completing-read "Rename tab by name: "
                                    (mapcar (lambda (tab)
                                              (cdr (assq 'name tab)))
                                            (funcall tab-bar-tabs-function)))))
     (list tab-name (read-from-minibuffer
                     "New name for tab (leave blank for automatic naming): "
                     nil nil nil nil tab-name))))
  (tab-bar-rename-tab new-name (1+ (tab-bar--tab-index-by-name tab-name))))

\f
;;; Tab history mode

(defvar tab-bar-history-limit 10
  "The number of history elements to keep.")

(defvar tab-bar-history-omit nil
  "When non-nil, omit window-configuration changes from the current command.")

(defvar tab-bar-history-back (make-hash-table)
  "History of back changes in every tab per frame.")

(defvar tab-bar-history-forward (make-hash-table)
  "History of forward changes in every tab per frame.")

(defvar tab-bar-history-old nil
  "Window configuration before the current command.")

(defvar tab-bar-history-old-minibuffer-depth 0
  "Minibuffer depth before the current command.")

(defun tab-bar-history--pre-change ()
  (setq tab-bar-history-old-minibuffer-depth (minibuffer-depth))
  ;; Store wc before possibly entering the minibuffer
  (when (zerop tab-bar-history-old-minibuffer-depth)
    (setq tab-bar-history-old
          `((wc . ,(current-window-configuration))
            (wc-point . ,(point-marker))))))

(defun tab-bar--history-change ()
  (when (and (not tab-bar-history-omit)
             tab-bar-history-old
             ;; Store wc before possibly entering the minibuffer
             (zerop tab-bar-history-old-minibuffer-depth))
    (puthash (selected-frame)
             (seq-take (cons tab-bar-history-old
                             (gethash (selected-frame) tab-bar-history-back))
                       tab-bar-history-limit)
             tab-bar-history-back))
  (when tab-bar-history-omit
    (setq tab-bar-history-omit nil)))

(defun tab-bar-history-back ()
  (interactive)
  (setq tab-bar-history-omit t)
  (let* ((history (pop (gethash (selected-frame) tab-bar-history-back)))
         (wc (cdr (assq 'wc history)))
         (wc-point (cdr (assq 'wc-point history))))
    (if (window-configuration-p wc)
        (progn
          (puthash (selected-frame)
                   (cons tab-bar-history-old
                         (gethash (selected-frame) tab-bar-history-forward))
                   tab-bar-history-forward)
          (set-window-configuration wc)
          (when (and (markerp wc-point) (marker-buffer wc-point))
            (goto-char wc-point)))
      (message "No more tab back history"))))

(defun tab-bar-history-forward ()
  (interactive)
  (setq tab-bar-history-omit t)
  (let* ((history (pop (gethash (selected-frame) tab-bar-history-forward)))
         (wc (cdr (assq 'wc history)))
         (wc-point (cdr (assq 'wc-point history))))
    (if (window-configuration-p wc)
        (progn
          (puthash (selected-frame)
                   (cons tab-bar-history-old
                         (gethash (selected-frame) tab-bar-history-back))
                   tab-bar-history-back)
          (set-window-configuration wc)
          (when (and (markerp wc-point) (marker-buffer wc-point))
            (goto-char wc-point)))
      (message "No more tab forward history"))))

(define-minor-mode tab-bar-history-mode
  "Toggle tab history mode for the tab bar."
  :global t
  (if tab-bar-history-mode
      (progn
        (when (and tab-bar-mode (not (get-text-property 0 'display tab-bar-back-button)))
          ;; This file is pre-loaded so only here we can use the right data-directory:
          (add-text-properties 0 (length tab-bar-back-button)
                               `(display (image :type xpm
                                                :file "tabs/left-arrow.xpm"
                                                :margin (2 . 0)
                                                :ascent center))
                               tab-bar-back-button))
        (when (and tab-bar-mode (not (get-text-property 0 'display tab-bar-forward-button)))
          ;; This file is pre-loaded so only here we can use the right data-directory:
          (add-text-properties 0 (length tab-bar-forward-button)
                               `(display (image :type xpm
                                                :file "tabs/right-arrow.xpm"
                                                :margin (2 . 0)
                                                :ascent center))
                               tab-bar-forward-button))

        (add-hook 'pre-command-hook 'tab-bar-history--pre-change)
        (add-hook 'window-configuration-change-hook 'tab-bar--history-change))
    (remove-hook 'pre-command-hook 'tab-bar-history--pre-change)
    (remove-hook 'window-configuration-change-hook 'tab-bar--history-change)))

\f
;;; Short aliases

(defalias 'tab-new         'tab-bar-new-tab)
(defalias 'tab-new-to      'tab-bar-new-tab-to)
(defalias 'tab-close       'tab-bar-close-tab)
(defalias 'tab-close-other 'tab-bar-close-other-tabs)
(defalias 'tab-undo        'tab-bar-undo-close-tab)
(defalias 'tab-select      'tab-bar-select-tab)
(defalias 'tab-next        'tab-bar-switch-to-next-tab)
(defalias 'tab-previous    'tab-bar-switch-to-prev-tab)
(defalias 'tab-recent      'tab-bar-switch-to-recent-tab)
(defalias 'tab-move        'tab-bar-move-tab)
(defalias 'tab-move-to     'tab-bar-move-tab-to)
(defalias 'tab-rename      'tab-bar-rename-tab)
(defalias 'tab-list        'tab-bar-list)

\f
;;; Non-graphical access to frame-local tabs (named window configurations)

(defun tab-bar-list ()
  "Display a list of named window configurations.
The list is displayed in the buffer `*Tabs*'.
It's placed in the center of the frame to resemble a window list
displayed by a window switcher in some window managers on Alt+Tab.

In this list of window configurations you can delete or select them.
Type ? after invocation to get help on commands available.
Type q to remove the list of window configurations from the display.

The first column shows `D' for a window configuration you have
marked for deletion."
  (interactive)
  (let ((dir default-directory)
        (minibuf (minibuffer-selected-window)))
    (let ((tab-bar-show nil)) ; don't enable tab-bar-mode if it's disabled
      (tab-bar-new-tab))
    ;; Handle the case when it's called in the active minibuffer.
    (when minibuf (select-window (minibuffer-selected-window)))
    (delete-other-windows)
    ;; Create a new window to replace the existing one, to not break the
    ;; window parameters (e.g. prev/next buffers) of the window just saved
    ;; to the window configuration.  So when a saved window is restored,
    ;; its parameters left intact.
    (split-window) (delete-window)
    (let ((switch-to-buffer-preserve-window-point nil))
      (switch-to-buffer (tab-bar-list-noselect)))
    (setq default-directory dir))
  (message "Commands: d, x; RET; q to quit; ? for help."))

(defun tab-bar-list-noselect ()
  "Create and return a buffer with a list of window configurations.
The list is displayed in a buffer named `*Tabs*'.

For more information, see the function `tab-bar-list'."
  (let* ((tabs (seq-remove (lambda (tab)
                             (eq (car tab) 'current-tab))
                           (funcall tab-bar-tabs-function)))
         ;; Sort by recency
         (tabs (sort tabs (lambda (a b) (< (cdr (assq 'time b))
                                           (cdr (assq 'time a)))))))
    (with-current-buffer (get-buffer-create
                          (format " *Tabs*<%s>" (or (frame-parameter nil 'window-id)
                                                    (frame-parameter nil 'name))))
      (setq buffer-read-only nil)
      (erase-buffer)
      (tab-bar-list-mode)
      ;; Vertical alignment to the center of the frame
      (insert-char ?\n (/ (- (frame-height) (length tabs) 1) 2))
      ;; Horizontal alignment to the center of the frame
      (setq tab-bar-list-column (- (/ (frame-width) 2) 15))
      (dolist (tab tabs)
        (insert (propertize
                 (format "%s %s\n"
                         (make-string tab-bar-list-column ?\040)
                         (propertize
                          (cdr (assq 'name tab))
                          'mouse-face 'highlight
                          'help-echo "mouse-2: select this window configuration"))
                 'tab tab)))
      (goto-char (point-min))
      (goto-char (or (next-single-property-change (point) 'tab) (point-min)))
      (when (> (length tabs) 1)
        (tab-bar-list-next-line))
      (move-to-column tab-bar-list-column)
      (set-buffer-modified-p nil)
      (setq buffer-read-only t)
      (current-buffer))))

(defvar tab-bar-list-column 3)
(make-variable-buffer-local 'tab-bar-list-column)

(defvar tab-bar-list-mode-map
  (let ((map (make-keymap)))
    (suppress-keymap map t)
    (define-key map "q"    'quit-window)
    (define-key map "\C-m" 'tab-bar-list-select)
    (define-key map "d"    'tab-bar-list-delete)
    (define-key map "k"    'tab-bar-list-delete)
    (define-key map "\C-d" 'tab-bar-list-delete-backwards)
    (define-key map "\C-k" 'tab-bar-list-delete)
    (define-key map "x"    'tab-bar-list-execute)
    (define-key map " "    'tab-bar-list-next-line)
    (define-key map "n"    'tab-bar-list-next-line)
    (define-key map "p"    'tab-bar-list-prev-line)
    (define-key map "\177" 'tab-bar-list-backup-unmark)
    (define-key map "?"    'describe-mode)
    (define-key map "u"    'tab-bar-list-unmark)
    (define-key map [mouse-2] 'tab-bar-list-mouse-select)
    (define-key map [follow-link] 'mouse-face)
    map)
  "Local keymap for `tab-bar-list-mode' buffers.")

(define-derived-mode tab-bar-list-mode nil "Window Configurations"
  "Major mode for selecting a window configuration.
Each line describes one window configuration in Emacs.
Letters do not insert themselves; instead, they are commands.
\\<tab-bar-list-mode-map>
\\[tab-bar-list-mouse-select] -- select window configuration you click on.
\\[tab-bar-list-select] -- select current line's window configuration.
\\[tab-bar-list-delete] -- mark that window configuration to be deleted, and move down.
\\[tab-bar-list-delete-backwards] -- mark that window configuration to be deleted, and move up.
\\[tab-bar-list-execute] -- delete marked window configurations.
\\[tab-bar-list-unmark] -- remove all kinds of marks from current line.
  With prefix argument, also move up one line.
\\[tab-bar-list-backup-unmark] -- back up a line and remove marks."
  (setq truncate-lines t))

(defun tab-bar-list-current-tab (error-if-non-existent-p)
  "Return window configuration described by this line of the list."
  (let* ((where (save-excursion
                  (beginning-of-line)
                  (+ 2 (point) tab-bar-list-column)))
         (tab (and (not (eobp)) (get-text-property where 'tab))))
    (or tab
        (if error-if-non-existent-p
            (user-error "No window configuration on this line")
          nil))))

(defun tab-bar-list-next-line (&optional arg)
  (interactive "p")
  (forward-line arg)
  (beginning-of-line)
  (move-to-column tab-bar-list-column))

(defun tab-bar-list-prev-line (&optional arg)
  (interactive "p")
  (forward-line (- arg))
  (beginning-of-line)
  (move-to-column tab-bar-list-column))

(defun tab-bar-list-unmark (&optional backup)
  "Cancel all requested operations on window configuration on this line and move down.
Optional prefix arg means move up."
  (interactive "P")
  (beginning-of-line)
  (move-to-column tab-bar-list-column)
  (let* ((buffer-read-only nil))
    (delete-char 1)
    (insert " "))
  (forward-line (if backup -1 1))
  (move-to-column tab-bar-list-column))

(defun tab-bar-list-backup-unmark ()
  "Move up and cancel all requested operations on window configuration on line above."
  (interactive)
  (forward-line -1)
  (tab-bar-list-unmark)
  (forward-line -1)
  (move-to-column tab-bar-list-column))

(defun tab-bar-list-delete (&optional arg)
  "Mark window configuration on this line to be deleted by \\<tab-bar-list-mode-map>\\[tab-bar-list-execute] command.
Prefix arg is how many window configurations to delete.
Negative arg means delete backwards."
  (interactive "p")
  (let ((buffer-read-only nil))
    (if (or (null arg) (= arg 0))
        (setq arg 1))
    (while (> arg 0)
      (delete-char 1)
      (insert ?D)
      (forward-line 1)
      (setq arg (1- arg)))
    (while (< arg 0)
      (delete-char 1)
      (insert ?D)
      (forward-line -1)
      (setq arg (1+ arg)))
    (move-to-column tab-bar-list-column)))

(defun tab-bar-list-delete-backwards (&optional arg)
  "Mark window configuration on this line to be deleted by \\<tab-bar-list-mode-map>\\[tab-bar-list-execute] command.
Then move up one line.  Prefix arg means move that many lines."
  (interactive "p")
  (tab-bar-list-delete (- (or arg 1))))

(defun tab-bar-list-delete-from-list (tab)
  "Delete the window configuration from both lists."
  (push `((frame . ,(selected-frame))
          (index . ,(tab-bar--tab-index tab))
          (tab . ,tab))
        tab-bar-closed-tabs)
  (set-frame-parameter nil 'tabs (delq tab (funcall tab-bar-tabs-function))))

(defun tab-bar-list-execute ()
  "Delete window configurations marked with \\<tab-bar-list-mode-map>\\[tab-bar-list-delete] commands."
  (interactive)
  (save-excursion
    (goto-char (point-min))
    (let ((buffer-read-only nil))
      (while (re-search-forward
              (format "^%sD" (make-string tab-bar-list-column ?\040))
              nil t)
        (forward-char -1)
        (let ((tab (tab-bar-list-current-tab nil)))
          (when tab
            (tab-bar-list-delete-from-list tab)
            (beginning-of-line)
            (delete-region (point) (progn (forward-line 1) (point))))))))
  (beginning-of-line)
  (move-to-column tab-bar-list-column)
  (force-mode-line-update))

(defun tab-bar-list-select ()
  "Select this line's window configuration.
This command deletes and replaces all the previously existing windows
in the selected frame."
  (interactive)
  (let* ((to-tab (tab-bar-list-current-tab t)))
    (kill-buffer (current-buffer))
    ;; Delete the current window configuration of tab list
    ;; without storing it in the undo list of closed tabs
    (let (tab-bar-closed-tabs)
      (tab-bar-close-tab nil (1+ (tab-bar--tab-index to-tab))))))

(defun tab-bar-list-mouse-select (event)
  "Select the window configuration whose line you click on."
  (interactive "e")
  (set-buffer (window-buffer (posn-window (event-end event))))
  (goto-char (posn-point (event-end event)))
  (tab-bar-list-select))

\f
(defun display-buffer-in-tab (buffer alist)
  "Display BUFFER in a tab.
ALIST is an association list of action symbols and values.  See
Info node `(elisp) Buffer Display Action Alists' for details of
such alists.

If ALIST contains a `name' entry, it creates a new tab with that name and
displays BUFFER in a new tab.  If a tab with this name already exists, it
switches to that tab before displaying BUFFER.  The `name' entry can be
a function, then it is called with two arguments: BUFFER and ALIST, and
should return the tab name.  When a `name' entry is omitted, create
a new tab without an explicit name.

This is an action function for buffer display, see Info
node `(elisp) Buffer Display Action Functions'.  It should be
called only by `display-buffer' or a function directly or
indirectly called by the latter."
  (let ((name (cdr (assq 'name alist))))
    (when (functionp name)
      (setq name (funcall name buffer alist)))
    (if name
        (let ((tab-index (tab-bar--tab-index-by-name name)))
          (if tab-index
              (tab-bar-select-tab (1+ tab-index))
            (let ((tab-bar-new-tab-choice t))
              (tab-bar-new-tab)
              (tab-bar-rename-tab name))))
      (tab-bar-new-tab))))

(defun tab-bar-buffer-visible-in-tabs-p (buffer)
  "Return non-nil when BUFFER is visible in other tabs."
  (seq-some (lambda (tab)
              (memq buffer (window-state-buffers (cdr (assq 'ws tab)))))
            (funcall tab-bar-tabs-function)))

\f
(defun switch-to-buffer-other-tab (buffer-or-name &optional norecord)
  "Switch to buffer BUFFER-OR-NAME in another tab.
Like \\[switch-to-buffer-other-frame] (which see), but creates a new tab."
  (interactive
   (list (read-buffer-to-switch "Switch to buffer in other tab: ")))
  (let ((tab-bar-new-tab-choice t))
    (tab-bar-new-tab))
  (delete-other-windows)
  (switch-to-buffer buffer-or-name norecord))

(defun find-file-other-tab (filename &optional wildcards)
  "Edit file FILENAME, in another tab.
Like \\[find-file-other-frame] (which see), but creates a new tab."
  (interactive
   (find-file-read-args "Find file in other tab: "
                        (confirm-nonexistent-file-or-buffer)))
  (let ((value (find-file-noselect filename nil nil wildcards)))
    (if (listp value)
        (progn
          (setq value (nreverse value))
          (switch-to-buffer-other-tab (car value))
          (mapc 'switch-to-buffer (cdr value))
          value)
      (switch-to-buffer-other-tab value))))

(define-key tab-prefix-map "2" 'tab-new)
(define-key tab-prefix-map "1" 'tab-close-other)
(define-key tab-prefix-map "0" 'tab-close)
(define-key tab-prefix-map "o" 'tab-next)
(define-key tab-prefix-map "b" 'switch-to-buffer-other-tab)
(define-key tab-prefix-map "f" 'find-file-other-tab)
(define-key tab-prefix-map "\C-f" 'find-file-other-tab)
(define-key tab-prefix-map "r" 'tab-rename)

\f
(provide 'tab-bar)

;;; tab-bar.el ends here

debug log:

solving 9c8c38fb83 ...
found 9c8c38fb83 in https://yhetil.org/emacs-bugs/8736ea5kcz.fsf@mail.linkov.net/
found 5eb332884c in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 5eb332884c507b8d6a1eeb071e860b24823933e2	lisp/tab-bar.el

applying [1/1] https://yhetil.org/emacs-bugs/8736ea5kcz.fsf@mail.linkov.net/
diff --git a/lisp/tab-bar.el b/lisp/tab-bar.el
index 5eb332884c..9c8c38fb83 100644

Checking patch lisp/tab-bar.el...
Applied patch lisp/tab-bar.el cleanly.

index at:
100644 9c8c38fb835758797f4d399f81573e61acadd22b	lisp/tab-bar.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).