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From: | Juri Linkov |
Subject: | Re: Shift selection using interactive spec |
Date: | Sat, 29 Mar 2008 02:54:34 +0200 |
User-agent: | Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (x86_64-pc-linux-gnu) |
> The hard part is to figure out a good design for it. > > It is important to support both returning a single value and returning > a list of values. There could be a character at the beginning of the > interactive output string which specifies that it's a list of values. > Otherwise it is one value. > > But what do we use after that? > > It could be a format string to format the values. > Is that general enough? > > And what about using Lisp code for how to format the value? > How would that Lisp code refer to the value itself? > Perhaps that Lisp code should take the form of a lambda expression. > > But how do we specify whether it wants a list of values or a single > value? I don't see any clean and natural way to specify that. As I understand the purpose of this feature is practically to move the last expression of the command's body that usually is written as (if (interactive-p) (message "Result of this command is %.0f" return-value) (format "%.0f" return-value)) to the second argument of `interactive'? If so, then I see no way to generalize this expression as it can be anything allowed in Lisp. -- Juri Linkov http://www.jurta.org/emacs/
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