bug#18132: Time for a smarter dired-guess-shell-alist-default? (dired-x.el)

[Juri Linkov]

> I'm sorry if I've missed something, but I don't see what this has to do
> with run-mailcap.

run-mailcap always runs the first alternative, but with
`mailcap-file-default-commands' you can select a command
to run using several M-n.

> It would be good to discourage customization of
> dired-guess-shell-alist-{default,user}, and steer users towards the
> non-program-specific mechanisms. It would also be good eventually not to
> have to maintain the list, or indeed the dired-guess-shell mechanism at all.

Instead of customization, a more useful UI would be to remember
the most frequently used commands, and provide them at the top
of the completions in the minibuffer.

> As for your mention of "the first M-n", as far as I can discover, the first
> time I press M-n, the default command, which was already mentioned in the
> prompt, is simply inserted at point, as if I had typed it. So is "the first
> suggestion that the user will get after the first M-n" actually the same
> thing as "the default suggestion"? (I hope so!)

Yes, this is so when the prompt displays the default value.