Re: interact with user

[Xend <firperfect@gmail.com>]

On Nov 26, 9:46 pm, Xah Lee <xah...@gmail.com> wrote:
> On Nov 26, 5:39 am, Xend <firperf...@gmail.com> wrote:
>
> > how can i get input from user (interact with user)in function with GNU/
> > emacs,the function interactive only work to parse arguments. are there
> > bulitin emacs function or i should programming to do it?
>
> btw, The “interactive” function has a general form like this:
> “(interactive lispExp)”, where in the lispExp is any lisp code, among
> which you can use any lisp function that query user. The return value
> of lispExp becomes the argument of your command.
>
> more answer here:
>
> • Emacs Lisp Idioms
>  http://xahlee.org/emacs/elisp_idioms.html
>
> here's relevant excerpt:
>
> ----------------------------------------
> Prompting User for Input
> Get User Input as Arguments
>
> Idiom for promping user for input as the argument to your command.
>
> Use this code “(interactive "‹code›‹promp string›")”. Example:
>
> (defun query-friends-phone (name)
>   "..."
>   (interactive "sEnter friend's name: ")
>   (message "Name: %s" name)
> )
>
> What the “(interactive "sEnter friend's name:")” does is that it will
> ask user to input something, taken as string, and becomes the value of
> your command's parameter.
>
> The “interactive” can be used to get other types of input. Here are
> some basic examples of using “interactive”.
>
>     * “(interactive)” makes the function available thru interactive
> use, where user can call it with execute-extended-command (M-x).
>     * “(interactive "s")” will prompt user for input, taken as string,
> as argument to the function.
>     * “(interactive "n")” will prompt user for input, taken as number,
> as argument to the function.
>
> The prompt text can follow the single-letter code string.
>
> If your function takes multiple inputs, you can promp user multiple
> times, using a single call “interactive”, by joining the promp code
> string with “\n” in between, like this:
>
> (defun query-friends-phone (name age)
>   "..."
>   (interactive "sEnter friend's name: \nnEnter friend's age: ")
>   (message "Name: %s, Age: %d" name age)
> )
>
> (info "(elisp)Defining Commands")
> Query For User Input
>
> The “(interactive ...)” clause is useful for filling parameters of
> your command. But sometimes you need to promp user in the middle of a
> program. For example: “Make change to this file?”. You can use “y-or-n-
> p” function. Like this:
>
> (if (y-or-n-p "Do it?")
>     (progn
>       ;; code to do something here
>     )
>   (progn
>     ;; code if user answered no.
>   )
> )
>
> The y-or-n-p will ask the user to type a “y” or “n” character. You can
> also use “yes-and-no-p”, which forces user to type full “yes” and “no”
> to answer. This can be used for example when you want to confirm
> deleting files.
>
> Yes-or-No-Queries
>
> If you need more general mechanism for getting user input, you'll need
> to use “read-from-minibuffer”. This can be useful for example, when
> you want use features like keyword completion or input history.
>
> (info "(elisp)Text from Minibuffer")
>
>   Xah
> ∑http://xahlee.org/
>
> ☄

thanks for your help.men