Re: scratch/tzz/auth-source-reveal-mode 4a7c98d 3/3: Create and document auth-source-reveal-mode

[Stefan Monnier]

> +(define-minor-mode auth-source-reveal-mode
[...]
> +  (when auth-source-reveal-mode
> +    ;; Install the prettification magic.
> +    (prettify-symbols-add-prettification-rx
> +     'auth-source-reveal-mode-prettify-regexp ; The identifier symbol.
> +     ;; regexp to hide/reveal
> +     (if (apply #'derived-mode-p auth-source-reveal-json-modes)
> +         (format "\"?password\"?[:[:blank:]]+\"\\([^\t\r\n\"]+\\)\"" 
> auth-source-reveal-regex)
> +       (format "\\b%s\\b\\s-+\\([^ \t\r\n]+\\)" auth-source-reveal-regex))
> +     auth-source-reveal-hider)
> +
> +    (setq-local
> +     prettify-symbols-compose-predicate #'auth-source-reveal-compose-p)

This erases any prior configuration of that variable, so it won't "play
ball" with other users.

> +  (prettify-symbols-mode (if auth-source-reveal-mode 1 -1)))

And here we forcefully enable/disable `prettify-symbols-mode` even if
all the user wanted if to hide the passwords.
I think we need to decouple the two user-level features.


        Stefan