lisp/informat.el

   1 ;;; informat.el --- info support functions package for Emacs
   2
   3 ;; Copyright (C) 1986, 2001-2017 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: emacs-devel@gnu.org
   6 ;; Keywords: help
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; Nowadays, the Texinfo formatting commands always tagify a buffer
  26 ;; (as does `makeinfo') since @anchor commands need tag tables.
  27
  28 ;;; Code:
  29
  30 (require 'info)
  31
  32 (declare-function texinfo-format-refill "texinfmt" ())
  33
  34 ;; From texinfmt.el
  35 (defvar texinfo-command-start)
  36 (defvar texinfo-command-end)
  37
  38 ;;;###autoload
  39 (defun Info-tagify (&optional input-buffer-name)
  40   "Create or update Info file tag table in current buffer or in a region."
  41   (interactive)
  42   ;; Save and restore point and restrictions.
  43   ;; save-restrictions would not work
  44   ;; because it records the old max relative to the end.
  45   ;; We record it relative to the beginning.
  46   (let ((omin (point-min))
  47         (omax (point-max))
  48         (nomax (= (point-max) (1+ (buffer-size))))
  49         (opoint (point))
  50         (msg (format "Tagifying %s..."
  51                      (cond (input-buffer-name
  52                             (format "region in %s" input-buffer-name))
  53                            (buffer-file-name
  54                             (file-name-nondirectory (buffer-file-name)))
  55                            (t "buffer")))))
  56     (message "%s" msg)
  57     (unwind-protect
  58     (progn
  59       (widen)
  60       (goto-char (point-min))
  61       (if (search-forward "\^_\nIndirect:\n" nil t)
  62           (message
  63            "Cannot tagify split info file.  Run this before splitting.")
  64         (let (tag-list
  65               refillp
  66               (case-fold-search t)
  67               (regexp
  68                (concat
  69                 "\\("
  70
  71
  72                 "\\("
  73                 "@anchor"        ; match-string 2 matches @anchor
  74                 "\\)"
  75                 "\\(-no\\|-yes\\)"  ; match-string 3 matches -no or -yes
  76                 "\\("
  77                 "-refill"
  78                 "\\)"
  79
  80                 "\\("
  81                 "{"
  82                 "\\)"
  83                 "\\("
  84                 "[^}]+"          ; match-string 6 matches arg to anchor
  85                 "\\)"
  86                 "\\("
  87                 "}"
  88                 "\\)"
  89
  90                 "\\|"
  91
  92                 "\\("
  93                 "\n\^_\\(\^L\\)?"
  94                 "\\)"
  95
  96                 "\\("
  97                 "\n\\(File:[ \t]*\\([^,\n\t]*\\)[,\t\n]+[ \t\n]*\\)?"
  98                 "Node:[ \t]*"
  99                 "\\("
 100                 "[^,\n\t]*"      ; match-string 13 matches arg to node name
 101                 "\\)"
 102                 "[,\t\n]"
 103                 "\\)"
 104
 105                 "\\)"
 106                 )))
 107           (while (re-search-forward regexp nil t)
 108             (if (string-equal "@anchor" (match-string 2))
 109                 (progn
 110                   ;; kludge lest lose match-data
 111                   (if (string-equal "-yes" (match-string 3))
 112                       (setq refillp t))
 113                   (setq tag-list
 114                         (cons (list
 115                                (concat "Ref: " (match-string 6))
 116                                (match-beginning 0))
 117                               tag-list))
 118                   (if (eq refillp t)
 119                       ;; set start and end so texinfo-format-refill works
 120                       (let ((texinfo-command-start (match-beginning 0))
 121                             (texinfo-command-end (match-end 0)))
 122                         (texinfo-format-refill))
 123                   (delete-region  (match-beginning 0) (match-end 0))))
 124               ;; else this is a Node
 125               (setq tag-list
 126                     (cons (list
 127                            (concat "Node: " (match-string-no-properties 13))
 128                            (1+ (match-beginning 10)))
 129                           tag-list))))
 130
 131               (goto-char (point-max))
 132               (forward-line -8)
 133               (let ((buffer-read-only nil))
 134                 (if (search-forward "\^_\nEnd tag table\n" nil t)
 135                     (let ((end (point)))
 136                       (search-backward "\nTag table:\n")
 137                       (beginning-of-line)
 138                       (delete-region (point) end)))
 139                 (goto-char (point-max))
 140                 (or (bolp)
 141                     (newline))
 142                 (insert "\^_\f\nTag table:\n")
 143                 (if (eq major-mode 'info-mode)
 144                     (move-marker Info-tag-table-marker (point)))
 145                 (setq tag-list (nreverse tag-list))
 146                 (while tag-list
 147                   (insert (car (car tag-list)) ?\177)
 148                   (princ (car (cdr (car tag-list))) (current-buffer))
 149                   (insert ?\n)
 150                   (setq tag-list (cdr tag-list)))
 151                 (insert "\^_\nEnd tag table\n")))))
 152       (goto-char opoint)
 153       (narrow-to-region omin (if nomax (1+ (buffer-size))
 154                                (min omax (point-max)))))
 155     (message "%sdone" msg)))
 156
 157 \f
 158 ;;;###autoload
 159 (defcustom Info-split-threshold 262144
 160   "The number of characters by which `Info-split' splits an info file."
 161   :type 'integer
 162   :version "23.1"
 163   :group 'texinfo)
 164
 165 ;;;###autoload
 166 (defun Info-split ()
 167   "Split an info file into an indirect file plus bounded-size subfiles.
 168 Each subfile will be up to the number of characters that
 169 `Info-split-threshold' specifies, plus one node.
 170
 171 To use this command, first visit a large Info file that has a tag
 172 table.  The buffer is modified into a (small) indirect info file which
 173 should be saved in place of the original visited file.
 174
 175 The subfiles are written in the same directory the original file is
 176 in, with names generated by appending `-' and a number to the original
 177 file name.  The indirect file still functions as an Info file, but it
 178 contains just the tag table and a directory of subfiles."
 179
 180   (interactive)
 181   (if (< (buffer-size) (+ 20000 Info-split-threshold))
 182       (error "This is too small to be worth splitting"))
 183   (goto-char (point-min))
 184   (search-forward "\^_")
 185   (forward-char -1)
 186   (let ((start (point))
 187         (chars-deleted 0)
 188         subfiles
 189         (subfile-number 1)
 190         (case-fold-search t)
 191         (filename (file-name-sans-versions buffer-file-name)))
 192     (goto-char (point-max))
 193     (forward-line -8)
 194     (setq buffer-read-only nil)
 195     (or (search-forward "\^_\nEnd tag table\n" nil t)
 196         (error "Tag table required; use M-x Info-tagify"))
 197     (search-backward "\nTag table:\n")
 198     (if (looking-at "\nTag table:\n\^_")
 199         (error "Tag table is just a skeleton; use M-x Info-tagify"))
 200     (beginning-of-line)
 201     (forward-char 1)
 202     (save-restriction
 203       (narrow-to-region (point-min) (point))
 204       (goto-char (point-min))
 205       (while (< (1+ (point)) (point-max))
 206         (goto-char (min (+ (point) Info-split-threshold) (point-max)))
 207         (search-forward "\^_" nil 'move)
 208         (setq subfiles
 209               (cons (list (+ start chars-deleted)
 210                           (concat (file-name-nondirectory filename)
 211                                   (format "-%d" subfile-number)))
 212                     subfiles))
 213         ;; Put a newline at end of split file, to make Unix happier.
 214         (insert "\n")
 215         (write-region (point-min) (point)
 216                       (concat filename (format "-%d" subfile-number)))
 217         (delete-region (1- (point)) (point))
 218         ;; Back up over the final ^_.
 219         (forward-char -1)
 220         (setq chars-deleted (+ chars-deleted (- (point) start)))
 221         (delete-region start (point))
 222         (setq subfile-number (1+ subfile-number))))
 223     (while subfiles
 224       (goto-char start)
 225       (insert (nth 1 (car subfiles))
 226               (format ": %d" (1- (car (car subfiles))))
 227               "\n")
 228       (setq subfiles (cdr subfiles)))
 229     (goto-char start)
 230     (insert "\^_\nIndirect:\n")
 231     (search-forward "\nTag Table:\n")
 232     (insert "(Indirect)\n")))
 233 \f
 234 (defvar Info-validate-allnodes)
 235 (defvar Info-validate-thisnode)
 236 (defvar Info-validate-lossages)
 237
 238 ;;;###autoload
 239 (defun Info-validate ()
 240   "Check current buffer for validity as an Info file.
 241 Check that every node pointer points to an existing node."
 242   (interactive)
 243   (save-excursion
 244     (save-restriction
 245       (widen)
 246       (goto-char (point-min))
 247       (if (search-forward "\nTag table:\n(Indirect)\n" nil t)
 248           (error "Don't yet know how to validate indirect info files: \"%s\""
 249                  (buffer-name (current-buffer))))
 250       (goto-char (point-min))
 251       (let ((Info-validate-allnodes '(("*")))
 252             (regexp "Node:[ \t]*\\([^,\n\t]*\\)[,\t\n]")
 253             (case-fold-search t)
 254             (tags-losing nil)
 255             (Info-validate-lossages ()))
 256         (while (search-forward "\n\^_" nil t)
 257           (forward-line 1)
 258           (let ((beg (point)))
 259             (forward-line 1)
 260             (if (re-search-backward regexp beg t)
 261                 (let ((name (downcase
 262                              (buffer-substring-no-properties
 263                               (match-beginning 1)
 264                               (progn
 265                                 (goto-char (match-end 1))
 266                                 (skip-chars-backward " \t")
 267                                 (point))))))
 268                   (if (assoc name Info-validate-allnodes)
 269                       (setq Info-validate-lossages
 270                             (cons (list name "Duplicate node-name" nil)
 271                                   Info-validate-lossages))
 272                     (setq Info-validate-allnodes
 273                           (cons (list name
 274                                       (progn
 275                                         (end-of-line)
 276                                         (and (re-search-backward
 277                                               "prev[ious]*:" beg t)
 278                                              (progn
 279                                                (goto-char (match-end 0))
 280                                                (downcase
 281                                                 (Info-following-node-name)))))
 282                                       beg)
 283                                 Info-validate-allnodes)))))))
 284         (goto-char (point-min))
 285         (while (search-forward "\n\^_" nil t)
 286           (forward-line 1)
 287           (let ((beg (point))
 288                 Info-validate-thisnode next)
 289             (forward-line 1)
 290             (if (re-search-backward regexp beg t)
 291                 (save-restriction
 292                   (let ((md (match-data)))
 293                     (search-forward "\n\^_" nil 'move)
 294                     (narrow-to-region beg (point))
 295                     (set-match-data md))
 296                   (setq Info-validate-thisnode (downcase
 297                                                 (buffer-substring-no-properties
 298                                                  (match-beginning 1)
 299                                                  (progn
 300                                                    (goto-char (match-end 1))
 301                                                    (skip-chars-backward " \t")
 302                                                    (point)))))
 303                   (end-of-line)
 304                   (and (search-backward "next:" nil t)
 305                        (setq next (Info-validate-node-name "invalid Next"))
 306                        (assoc next Info-validate-allnodes)
 307                        (if (equal (car (cdr (assoc next Info-validate-allnodes)))
 308                                   Info-validate-thisnode)
 309                            ;; allow multiple `next' pointers to one node
 310                            (let ((tem Info-validate-lossages))
 311                              (while tem
 312                                (if (and (equal (car (cdr (car tem)))
 313                                                "should have Previous")
 314                                         (equal (car (car tem))
 315                                                next))
 316                                    (setq Info-validate-lossages
 317                                          (delq (car tem) Info-validate-lossages)))
 318                                (setq tem (cdr tem))))
 319                          (setq Info-validate-lossages
 320                                (cons (list next
 321                                            "should have Previous"
 322                                            Info-validate-thisnode)
 323                                      Info-validate-lossages))))
 324                   (end-of-line)
 325                   (if (re-search-backward "prev[ious]*:" nil t)
 326                       (Info-validate-node-name "invalid Previous"))
 327                   (end-of-line)
 328                   (if (search-backward "up:" nil t)
 329                       (Info-validate-node-name "invalid Up"))
 330                   (if (re-search-forward "\n* Menu:" nil t)
 331                       (while (re-search-forward "\n\\* " nil t)
 332                         (Info-validate-node-name
 333                          (concat "invalid menu item "
 334                                  (buffer-substring (point)
 335                                                    (save-excursion
 336                                                      (skip-chars-forward "^:")
 337                                                      (point))))
 338                          (Info-extract-menu-node-name))))
 339                   (goto-char (point-min))
 340                   (while (re-search-forward "\\*note[ \n]*[^:\t]*:" nil t)
 341                     (goto-char (+ (match-beginning 0) 5))
 342                     (skip-chars-forward " \n")
 343                     (Info-validate-node-name
 344                      (concat "invalid reference "
 345                              (buffer-substring (point)
 346                                                (save-excursion
 347                                                  (skip-chars-forward "^:")
 348                                                  (point))))
 349                      (Info-extract-menu-node-name "Bad format cross-reference")))))))
 350         (setq tags-losing (not (Info-validate-tags-table)))
 351         (if (or Info-validate-lossages tags-losing)
 352             (with-output-to-temp-buffer " *problems in info file*"
 353               (while Info-validate-lossages
 354                 (princ "In node \"")
 355                 (princ (car (car Info-validate-lossages)))
 356                 (princ "\", ")
 357                 (let ((tem (nth 1 (car Info-validate-lossages))))
 358                   (cond ((string-match "\n" tem)
 359                          (princ (substring tem 0 (match-beginning 0)))
 360                          (princ "..."))
 361                         (t
 362                          (princ tem))))
 363                 (if (nth 2 (car Info-validate-lossages))
 364                     (progn
 365                       (princ ": ")
 366                       (let ((tem (nth 2 (car Info-validate-lossages))))
 367                         (cond ((string-match "\n" tem)
 368                                (princ (substring tem 0 (match-beginning 0)))
 369                                (princ "..."))
 370                               (t
 371                                (princ tem))))))
 372                 (terpri)
 373                 (setq Info-validate-lossages (cdr Info-validate-lossages)))
 374               (if tags-losing (princ "\nTags table must be recomputed\n")))
 375           ;; Here if info file is valid.
 376           ;; If we already made a list of problems, clear it out.
 377           (save-excursion
 378             (if (get-buffer " *problems in info file*")
 379                 (progn
 380                   (set-buffer " *problems in info file*")
 381                   (kill-buffer (current-buffer)))))
 382           (message "File appears valid"))))))
 383
 384 (defun Info-validate-node-name (kind &optional name)
 385   (if name
 386       nil
 387     (goto-char (match-end 0))
 388     (skip-chars-forward " \t")
 389     (if (= (following-char) ?\()
 390         nil
 391       (setq name
 392             (buffer-substring-no-properties
 393              (point)
 394              (progn
 395                (skip-chars-forward "^,\t\n")
 396                (skip-chars-backward " ")
 397                (point))))))
 398   (if (null name)
 399       nil
 400     (setq name (downcase name))
 401     (or (and (> (length name) 0) (= (aref name 0) ?\())
 402         (assoc name Info-validate-allnodes)
 403         (setq Info-validate-lossages
 404               (cons (list Info-validate-thisnode kind name)
 405                     Info-validate-lossages))))
 406   name)
 407
 408 (defun Info-validate-tags-table ()
 409   (goto-char (point-min))
 410   (if (not (search-forward "\^_\nEnd tag table\n" nil t))
 411       t
 412     (not (catch 'losing
 413            (let* ((end (match-beginning 0))
 414                   (start (progn (search-backward "\nTag table:\n")
 415                                 (1- (match-end 0))))
 416                   tem)
 417              (setq tem Info-validate-allnodes)
 418              (while tem
 419                (goto-char start)
 420                (or (equal (car (car tem)) "*")
 421                    (search-forward (concat "Node: "
 422                                            (car (car tem))
 423                                            "\177")
 424                                    end t)
 425                    (throw 'losing 'x))
 426                (setq tem (cdr tem)))
 427              (goto-char (1+ start))
 428              (while (looking-at ".*Node: \\(.*\\)\177\\([0-9]+\\)$")
 429                (setq tem (downcase (buffer-substring-no-properties
 430                                      (match-beginning 1)
 431                                      (match-end 1))))
 432                (setq tem (assoc tem Info-validate-allnodes))
 433                (if (or (not tem)
 434                        (< 1000 (progn
 435                                  (goto-char (match-beginning 2))
 436                                  (setq tem (- (car (cdr (cdr tem)))
 437                                               (read (current-buffer))))
 438                                  (if (> tem 0) tem (- tem)))))
 439                    (throw 'losing 'y))
 440                (forward-line 1)))
 441            (if (looking-at "\^_\n")
 442                (forward-line 1))
 443            (or (looking-at "End tag table\n")
 444                (throw 'losing 'z))
 445            nil))))
 446 \f
 447 ;;;###autoload
 448 (defun batch-info-validate ()
 449   "Runs `Info-validate' on the files remaining on the command line.
 450 Must be used only with -batch, and kills Emacs on completion.
 451 Each file will be processed even if an error occurred previously.
 452 For example, invoke \"emacs -batch -f batch-info-validate $info/ ~/*.info\""
 453   (if (not noninteractive)
 454       (error "batch-info-validate may only be used -batch"))
 455   (let ((version-control t)
 456         (auto-save-default nil)
 457         (find-file-run-dired nil)
 458         (kept-old-versions 259259)
 459         (kept-new-versions 259259))
 460     (let ((error 0)
 461           file
 462           (files ()))
 463       (while command-line-args-left
 464         (setq file (expand-file-name (car command-line-args-left)))
 465         (cond ((not (file-exists-p file))
 466                (message ">> %s does not exist!" file)
 467                (setq error 1
 468                      command-line-args-left (cdr command-line-args-left)))
 469               ((file-directory-p file)
 470                (setq command-line-args-left (nconc (directory-files file)
 471                                               (cdr command-line-args-left))))
 472               (t
 473                (setq files (cons file files)
 474                      command-line-args-left (cdr command-line-args-left)))))
 475       (while files
 476         (setq file (car files)
 477               files (cdr files))
 478         (let ((lose nil))
 479           (condition-case err
 480               (progn
 481                 (if buffer-file-name (kill-buffer (current-buffer)))
 482                 (find-file file)
 483                 (buffer-disable-undo (current-buffer))
 484                 (set-buffer-modified-p nil)
 485                 (fundamental-mode)
 486                 (let ((case-fold-search nil))
 487                   (goto-char (point-max))
 488                   (cond ((search-backward "\n\^_\^L\nTag table:\n" nil t)
 489                          (message "%s already tagified" file))
 490                         ((< (point-max) 30000)
 491                          (message "%s too small to bother tagifying" file))
 492                         (t
 493                          (Info-tagify))))
 494                 (let ((loss-name " *problems in info file*"))
 495                   (message "Checking validity of info file %s..." file)
 496                   (if (get-buffer loss-name)
 497                       (kill-buffer loss-name))
 498                   (Info-validate)
 499                   (if (not (get-buffer loss-name))
 500                       nil ;(message "Checking validity of info file %s... OK" file)
 501                     (message "----------------------------------------------------------------------")
 502                     (message ">> PROBLEMS IN INFO FILE %s" file)
 503                     (with-current-buffer loss-name
 504                       (princ (buffer-substring-no-properties
 505                               (point-min) (point-max))))
 506                     (message "----------------------------------------------------------------------")
 507                     (setq error 1 lose t)))
 508                 (if (and (buffer-modified-p)
 509                          (not lose))
 510                     (progn (message "Saving modified %s" file)
 511                            (save-buffer))))
 512             (error (message ">> Error: %s" (prin1-to-string err))))))
 513       (kill-emacs error))))
 514
 515 (provide 'informat)
 516
 517 ;;; informat.el ends here