brace expansion in function

brace expansion in function

[Eric Smith]

I would like a shell function that expands the arg
{corrs,dylan,crespo}

This try only gives all corrs songs:

mpg() {
mpg321 *$1*
}

thanks

-- 
Eric Smith

Re: brace expansion in function

[Bart Schaefer]

On Sun, 13 Jun 2004, Eric Smith wrote:

> I would like a shell function that expands the arg
> {corrs,dylan,crespo}

Do you mean that you have typed

	mpg {corrs,dylan,crespo}

?? If that's what you did, then the shell will have expanded the braces
before invoking the function, so it is the same as if you'd typed

	mpg corrs dylan crespo

(which is actually fewer characters, so I'm not sure why you didn't just
type that directly) in which case what you want is something like

	mpg() { mpg321 *${^@}* }

If instead you mean that you typed

	mpg '{corrs,dylan,crespo}'

or some such quoting, then you need

	mpg() { eval "mpg321 *$1*" }

If none of this looks reasonable, you'll have to ask a more detailed 
question.

Re: brace expansion in function

[Eric Smith]

Bart Schaefer said:
> 
> 	mpg corrs dylan crespo
> 
> (which is actually fewer characters, so I'm not sure why you didn't just
> type that directly) in which case what you want is something like
> 
> 	mpg() { mpg321 *${^@}* }
> 

yummy.

-- 
Eric Smith

Re: brace expansion in function

[Thomas Köhler]

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Eric Smith wrote:
> I would like a shell function that expands the arg
> {corrs,dylan,crespo}
> 
> This try only gives all corrs songs:
> 
> mpg() {
> mpg321 *$1*
> }

mpg() {
    local arg
    local l
    for arg ; do l="*$arg* $l" ; done
    eval mpg321 $l
}

Ciao,
Thomas

-- 
 Thomas Köhler       Email:       jean-luc@picard.franken.de
     <><             WWW:           http://jeanluc-picard.de
                     IRC:                           tkoehler
                     PGP public key available from Homepage!

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ignore globs that do not match

[Eric Smith]

Thomas Köhler said:
> mpg() {
>     local arg
>     local l
>     for arg ; do l="*$arg* $l" ; done
>     eval mpg321 $l
> }
> 

Nice!

But how might I still hear dylan and crespo if I typed:

$ mpg dylan gibberish crespo

("setopt cshnullglob" does not seem to work.)

-- 
Eric Smith

Re: ignore globs that do not match

[Bart Schaefer]

On Mon, 14 Jun 2004, Eric Smith wrote:

> Thomas Köhler said:
> > mpg() {
> >     local arg
> >     local l
> >     for arg ; do l="*$arg* $l" ; done
> >     eval mpg321 $l
> > }
> > 
> 
> Nice!

Almost equivalent to, but more wordy than, my *${^@}* solution.  The only
difference is that e.g.:

	mpg 'd*n'

(note quotes) evals "mpg321 *d*n*" and therefore expands the middle "*"
as well.  It wasn't clear you wanted those semantics.

> ("setopt cshnullglob" does not seem to work.)

That would be the way.  Works when I try it, with either formulation of
the function.

> $ mpg dylan gibberish crespo

Are you sure there are no globbing characters in the gibberish?  The
setopt will only apply inside the function, e.g. if you say

$ mpg foo*bar

then the shell first attempts to glob foo*bar and either gets "no match"  
or calls the mpg function with the results as arguments.

Perhaps what you're after is something like:

	mpg_glob() { mpg321 *${~^@}* }
	alias mpg='noglob mpg_glob'

Re: ignore globs that do not match -> prevent function from exiting

[Eric Smith]

Bart Schaefer said:
> 	mpg_glob() { mpg321 *${~^@}* }
> 	alias mpg='noglob mpg_glob'

If the globbed argument list includes an invalid file or something that
causes mpg321 to fall over, then mpg_glob() exits.

How could I avoid this?

thanks
-- 
Eric Smith

Re: ignore globs that do not match -> prevent function from exiting

[Bart Schaefer]

nOn Tue, 22 Jun 2004, Eric Smith wrote:

> Bart Schaefer said:
> > 	mpg_glob() { mpg321 *${~^@}* }
> > 	alias mpg='noglob mpg_glob'
> 
> If the globbed argument list includes an invalid file or something that
> causes mpg321 to fall over, then mpg_glob() exits.

Hmm, sorry, I didn't consolidate all the other fragmentary answers I gave
into that final example.  It should be

	mpg_glob() {
	  setopt localoptions cshnullglob
	  mpg321 *${~^@}*
	}
	alias mpg='noglob mpg_glob'