elisp question: format

elisp question: format

[Aaron Maxwell]

Hi,

Is there a way to direct the format function to use a single value
repeatedly for several positional parameters?

Here's the specific example of what I mean.  In my .emacs, the
following string is used:
"/home/amax/opt/scmutils/mit-scheme/bin/scheme --band /home/amax/opt/scmutils/mit-scheme/lib/edwin-mechanics.com --heap 6000 --library /home/amax/opt/scmutils/mit-scheme/lib"

(See [1] if you're curious what it's for.)  The substring "/home/amax/opt/scmutils/mit-scheme" repeats 3 times. The idea I had is to use a format string like:

(format "%s/bin/scheme --band %s/lib/edwin-mechanics.com --heap 6000 --library %s/lib" ...(something)...)

... and to do this in a way that I only had to type that substring
once.  However, I did not find a way to do this directly.  The closest
thing I came up with is this:

(apply 'format 
       (cons "%s/bin/scheme --band %s/lib/edwin-mechanics.com --heap 6000 --library %s/lib" 
       (make-list 3 "/home/amax/opt/scmutils/mit-scheme")))

Is there a clearer way to do this? 

Thanks in advance.

[1] http://redsymbol.blogspot.com/2007/06/using-gnu-emacs-with-scmutils.html
-- 
Aaron Maxwell
http://redsymbol.net

Business Owners and Self-Employed:  You're NOT Alone!
The Business Butler - http://businessbutler.us

Re: elisp question: format

[Kevin Rodgers]

Aaron Maxwell wrote:
> Hi,
> 
> Is there a way to direct the format function to use a single value
> repeatedly for several positional parameters?
> 
> Here's the specific example of what I mean.  In my .emacs, the
> following string is used:
> "/home/amax/opt/scmutils/mit-scheme/bin/scheme --band /home/amax/opt/scmutils/mit-scheme/lib/edwin-mechanics.com --heap 6000 --library /home/amax/opt/scmutils/mit-scheme/lib"
> 
> (See [1] if you're curious what it's for.)  The substring "/home/amax/opt/scmutils/mit-scheme" repeats 3 times. The idea I had is to use a format string like:
> 
> (format "%s/bin/scheme --band %s/lib/edwin-mechanics.com --heap 6000 --library %s/lib" ...(something)...)
> 
> ... and to do this in a way that I only had to type that substring
> once.  However, I did not find a way to do this directly.  The closest
> thing I came up with is this:
> 
> (apply 'format 
>        (cons "%s/bin/scheme --band %s/lib/edwin-mechanics.com --heap 6000 --library %s/lib" 
>        (make-list 3 "/home/amax/opt/scmutils/mit-scheme")))
> 
> Is there a clearer way to do this? 

(let ((scheme-home "/home/amax/opt/scmutils/mit-scheme"))
   (format "%s/bin/scheme --band %s/lib/edwin-mechanics.com --heap 6000 
--library %s/lib"
	  scheme-home scheme-home scheme-home))

-- 
Kevin Rodgers
Denver, Colorado, USA

Re: elisp question: format

[Joel J. Adamson]

Kevin Rodgers <kevin.d.rodgers@gmail.com> writes:

> Aaron Maxwell wrote:
>>
>> Is there a clearer way to do this? 
>
> (let ((scheme-home "/home/amax/opt/scmutils/mit-scheme"))
>   (format "%s/bin/scheme --band %s/lib/edwin-mechanics.com --heap 6000
> --library %s/lib"
> 	  scheme-home scheme-home scheme-home))

And what if I wanted to repeat it a thousand times?

Joel

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Re: elisp question: format

[Pascal Bourguignon]

Aaron Maxwell <amax@redsymbol.net> writes:
> Is there a way to direct the format function to use a single value
> repeatedly for several positional parameters?

No. This is not Common Lisp!

Well, you could use emacs-cl:

(load "load-cl")
(FORMAT nil "First: ~A ; Second: ~:*~A" 42)
--> "First: 42 ; Second: 42"


Yep, not only do I have (require 'cl) first thing in my ~/.emacs, but
I also have (load "load-cl") next...

-- 
__Pascal Bourguignon__                     http://www.informatimago.com/

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Re: elisp question: format

[Daniel Jensen]

Aaron Maxwell <amax@redsymbol.net> writes:

> Is there a way to direct the format function to use a single value
> repeatedly for several positional parameters?

You can use format-spec for this.

(require 'format-spec)                  ; from Gnus

(format-spec "%s/bin/scheme --band %s/lib/edwin-mechanics.com ..."
             '((?s . "/home/amax/opt/scmutils/mit-scheme")))

Re: elisp question: format

[Aaron Maxwell]

Thanks for the answers, guys, good to know - I appreciate it.
-A

On Sunday 24 June 2007 04:22, Daniel Jensen wrote:
> Aaron Maxwell <amax@redsymbol.net> writes:
> > Is there a way to direct the format function to use a single value
> > repeatedly for several positional parameters?
>
> You can use format-spec for this.
>
> (require 'format-spec)                  ; from Gnus
>
> (format-spec "%s/bin/scheme --band %s/lib/edwin-mechanics.com ..."
>              '((?s . "/home/amax/opt/scmutils/mit-scheme")))
> _______________________________________________
> help-gnu-emacs mailing list
> help-gnu-emacs@gnu.org
> http://lists.gnu.org/mailman/listinfo/help-gnu-emacs

-- 
Aaron Maxwell
http://redsymbol.net

Business Owners and Self-Employed:  You're NOT Alone!
The Business Butler - http://businessbutler.us