Is there there a way to view the values of all bound emacs variables matching a prefix?

For example, I would like to k开发者_如何学编程now the values of all variables with prefix "comint-*"

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If you just want to get customizable variables, then you can use M-x customize-apropos.

Otherwise, try something like this:

(with-output-to-temp-buffer "*Variables*"
  (set-buffer standard-output)
  (insert (mapconcat (lambda (sym) (format "%s: %s" sym (eval sym)))
                     (apropos-internal "^comint-.*" 'boundp) "\n\n")))

That'll produce a *Variables* buffer with contents like:

comint-accum-marker: nil

comint-buffer-maximum-size: 1024

comint-completion-addsuffix: t
...

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Not "perfect" but you could do C-h v prefix and then hit tab to get all the variables that start with that `prefix.

If you want to try it out manually, the function you need to dig into is completion--do-completion.

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Here's how I'd do it:

(require 'cl)
(loop for sym being the symbols
      when (and (boundp sym) (string-match "^comint-" (symbol-name sym)))
      collect (cons sym (symbol-value sym)))

On my system, this evaluates to:

((comint-output-filter-functions comint-watch-for-password-prompt)
 (comint-mode-abbrev-table . [ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0])
 (comint-exec-hook (lambda nil (set-process-query-on-exit-flag ... nil)))
 (comint-file-name-prefix . ""))