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Re: TeX-documentation-texdoc

From: Ikumi Keita
Subject: Re: TeX-documentation-texdoc
Date: Mon, 23 Jan 2023 16:33:42 +0900

Hi Greg,

>>>>> Greg Bognar <> writes:
> Your code works! So yes, your commit harmed okular in some way.

Thank you. That's a bad news for me :-)

> Where do we go from here?

Then we have to find out the way compatible for both okular and evince.
Unfortunately, the old code is bad for evince; it still blocks emacs
until the user quits evince as described in bug#28905[1].


1. Can you please test the following code, then? This uses
   `start-process' instead of `start-process-shell-command', as suggested
   by Mosè in the thread of [1].
(defun TeX-documentation-texdoc (&optional arg)
  "Run texdoc to read documentation.

Prompt for selection of the package of which to show the documentation.

If called with a prefix argument ARG, after selecting the
package, prompt for selection of the manual of that package to
  (interactive "P")
  (let ((pkg (thing-at-point 'symbol))
        buffer list doc)
    ;; Strip off properties.  XXX: XEmacs doesn't have
    ;; `substring-no-properties'.
    (set-text-properties 0 (length pkg) nil pkg)
    (setq pkg (TeX-read-string "View documentation for: " pkg))
    (unless (zerop (length pkg))
      (if arg
          ;; Called with prefix argument: run "texdoc --list --nointeract <pkg>"
            ;; Create the buffer, insert the result of the command, and
            ;; accumulate the list of manuals.
            (with-current-buffer (get-buffer-create
                                  (setq buffer (format "*texdoc: %s*" pkg)))
              (insert (shell-command-to-string
                       (concat "texdoc --list --nointeract " pkg)))
              (goto-char 1)             ; No need to use `point-min' here.
                (while (re-search-forward
                        ;; XXX: XEmacs doesn't support character classes in
                        ;; regexps, like "[:alnum:]".
                        "^ *\\([0-9]+\\) +\\([-~/a-zA-Z0-9_.${}#%,:\\ ()]+\\)" 
nil t)
                  (push (cons (match-string 1) (match-string 2)) list))))
                 ((null (executable-find "texdoc"))
                  ;; Note: `shell-command-to-string' uses shell, only
                  ;; `call-process' looks at `exec-path', thus only here makes
                  ;; sense to use `executable-find' to test whether texdoc is
                  ;; available.
                  (message "texdoc not found"))
                  ;; Go on if there are manuals listed: show the buffer, prompt
                  ;; for the number of the manual, then run
                  ;;     texdoc --just-view <doc>
                  (TeX-pop-to-buffer (get-buffer buffer))
                  (condition-case nil
                      (when (setq doc
                                  (cdr (assoc (TeX-read-string "Please enter \
the number of the file to view, anything else to skip: ") list)))
                        (call-process "texdoc" nil 0 nil "--just-view" doc))
                    ;; Exit gently if a `quit' signal is thrown.
                    (quit nil)))
                 (t (message "No documentation found for %s" pkg)))
              ;; In any case quit-and-kill the window.
              (when (get-buffer-window buffer)
                (quit-window t (get-buffer-window buffer)))))
        ;; Called without prefix argument: just run "texdoc --view <pkg>" and
        ;; show the output, so that the user is warned in case it doesn't find
        ;; the documentation or "texdoc" is not available.
        (message "%s"
                 ;; The folowing code to the end of `defun' used to be
                 ;; just
                 ;; (shell-command-to-string (concat "texdoc --view " pkg))
                 ;; , but in some cases it blocks emacs until the user
                 ;; quits the viewer (bug#28905).
                   (let* (;; Use pipe rather than pty because the
                          ;; latter causes atril (evince variant
                          ;; viewer) to exit before showing anything.
                          (process-connection-type nil)
                          (process (start-process
                                    "Doc view" standard-output
                                    "texdoc" "--view" pkg)))
                     ;; Suppress the message "Process Doc view
                     ;; finished".
                     (set-process-sentinel process #'ignore)
                     ;; Kill temp buffer without query.  This is
                     ;; necessary, at least for some environment, if
                     ;; the underlying shell can't find the texdoc
                     ;; executable.
                     (set-process-query-on-exit-flag process nil)
                     ;; Don't discard shell output.
                     (accept-process-output process))))))))

2. If the above code fails, then could you provide the value of the
   following environment variables in the emacs shell (M-x shell)? That
   is, type "echo $PDFVIEWER RET" etc. in that shell.


   I'd like to know whether there is something bad in your viewer
   setting to run inside emacs while safe in a vanilla shell.

Ikumi Keita
#StandWithUkraine #StopWarInUkraine

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