${i:r}-question

${i:r}-question

[Meino Christian Cramer]

Hi,

 I am currently wrting a little shell script, which encapsulates the
 new "arepack" addition of atool-0.31.0 (nice tool! use it! :O))).

 The shell script should repack all archives given on the command line
 to *.tar.7z _or_ *.7z archives -- depending on whether the original
 archive was a plain *.bz2 (one file compressed with bzip2) or a
 *.tar.bz2 (tar archive with bzip2 compressed).

 Experimenting with expressions similiar to

			   afile="test.tar.bz2"
			   echo ${afile:e}

 I am wondering, whether it would possible to strip off more than one
 "instance" of extension ("tar.bz2" instead of "bz2") from "$afile"
 without using somthing like

			   echo ${${afile:e}}

 since this would depends on knowing whether it is a *.bz2 or a
 *.tar.bz2 archive before evaluating the expression, which reveals
 exactly this information...... :)

 Thank you very much in advance for any help and enlightment ! ;O)))

 Have a nice weekend !
 Meino

Re: ${i:r}-question

[zzapper]

On Fri, 26 Aug 2005 18:32:16 +0200 (CEST),  wrote:

>Hi,
>
> I am currently wrting a little shell script, which encapsulates the
> new "arepack" addition of atool-0.31.0 (nice tool! use it! :O))).
>
Sorry no answer to your query but :-

Presumably:-

Atool - Script for managing file archives
atool manages file archives (tar, tar+gzip, zip, etc). 'aunpack' extracts files from an archive,
andt overcomes the dreaded "multiple files in archive root" problem by first extracting to a unique
subdirectory, and then moving back the files if possible. aunpack also prevents local files from
being overwritten by mistake. Other commands provided are apack (for creating archives), als (for
listing files in archives), and acat (for extracting files to stdout).

Can't see where you'd use it?

-- 
zzapper
Success for Techies and Vim,Zsh tips
http://SuccessTheory.com/

Re: ${i:r}-question

[Meino Christian Cramer]

From: zzapper <david@tvis.co.uk>
Subject: Re: ${i:r}-question
Date: Sat, 27 Aug 2005 18:11:41 +0100

Hi David ! :)

 Thanks for your reply.

 Hrmmm....may be I struggled over my own limited English in this
 conversation. 

 With "(nice tool! use it! :O)))" I meant "Atool is a nice tool and I
 want to recommend it."

 Unfortunately I dont know exactly, whether I understood you right: 
 "Can't see where you'd use it?"
 
 Do you want to know why/when I use it? If so:
 
 A comparison: Packing a sourcetree with p7zip, preserving as much
 information a possible, conventional way:

 tar cvf - <sourcetree> | 7z a -si <sourcetree>.7z -

 With apack:

 apack <sourcetree>.7z <sourcetree> 

 I think, this clearifies things a little ?! :O)

 Keep zshing and have a nice weekend!
 Meino


> On Fri, 26 Aug 2005 18:32:16 +0200 (CEST),  wrote:
> 
> >Hi,
> >
> > I am currently wrting a little shell script, which encapsulates the
> > new "arepack" addition of atool-0.31.0  (nice tool! use it! :O))).
> >
> Sorry no answer to your query but :-
> 
> Presumably:-
> 
> Atool - Script for managing file archives
> atool manages file archives (tar, tar+gzip, zip, etc). 'aunpack' extracts files from an archive,
> andt overcomes the dreaded "multiple files in archive root" problem by first extracting to a unique
> subdirectory, and then moving back the files if possible. aunpack also prevents local files from
> being overwritten by mistake. Other commands provided are apack (for creating archives), als (for
> listing files in archives), and acat (for extracting files to stdout).
> 
> Can't see where you'd use it?
> 
> -- 
> zzapper
> Success for Techies and Vim,Zsh tips
> http://SuccessTheory.com/
> 

Re: ${i:r}-question

[Bart Schaefer]

On Aug 26,  6:32pm, Meino Christian Cramer wrote:
} 
}  I am currently wrting a little shell script, which encapsulates the
}  new "arepack" addition of atool-0.31.0 (nice tool! use it! :O))).

I'm glad you answered zzapper's question because I was scratching my
head over why it made a difference if the bzip'd file was also tar'd.
 
}  I am wondering, whether it would possible to strip off more than one
}  "instance" of extension ("tar.bz2" instead of "bz2") from "$afile"

You mean e.g. ${${(M)afile%%(.tar|).(7z|bz2|gz)}#.} except that you
don't want to have to enumerate (7z|bz2|gz)?  Otherwise I'm not clear
on the question.

Incidentally if it's important to know about the "tar" part, then have
you considered what to do with e.g. ".tgz" files?

Re: ${i:r}-question

[Meino Christian Cramer]

From: Bart Schaefer <schaefer@brasslantern.com>
Subject: Re: ${i:r}-question
Date: Sat, 27 Aug 2005 20:44:40 +0000

Hi Bart , :)

 thanks for your reply  ! :O)

 To "unbroke" my broken English a little bit more I will try to tell a
 little more of my (a little longish) "archiver/compressor"-story.

 p7zip is a data compressor, which has a compression ratio even better
 than bzip2 (!). Since "space" on my harddisk is a seldom guest, I was
 happy, that Oskar, the author of atool has implemented the "arepack"
 tool in addition to all the other very handy tools of his atool suit.

 In opposite to bzip2/gzip p7zip is able to build archives of more
 than one file. Since it originates in the Windows world, it does not
 reconstruct certain attributes like gid and uid of the files of such
 an p7zip-only-many-files archive. The author of p7zip recommends to
 make a tar archive first and then compress it with p7zip for backup
 purposes on Unix/Linux (which I use).

 The format of the commandline to feed into arepack is as follows:

	 arepack -F<new target archive form> -e <old archive/s>

 For *.tar.gz archives it would be:

 	 arepack -F.tar.7z -e zsh-4.2.5.tar.gz

 but if you get a single file compressed with gzip for example, it
 would be:
 
 	 arepack -F.7z -e zsh-doc-4.2.5.gz

 Therefore I was looking for a zsh script expression -- without the
 need to use "big brothers" like sed, perl etc -- which simply gives
 me "the whole extension string" in one turn, without to destinguish
 between the 2-extension form like ".tar.gz" from the 1-extension-form
 like ".gz" in the script code itsself in beforehand. Additionally it
 would be nice, if the code would give me the information, whether it
 has found a 2- or an 1-extension form. Or shorter:

                             Output:

 Input:                      +------> complete extension
                             |
 <filename> -----> script ---+
                             |
                             +------> info whether it is an 1- or
                                      2-extension form

 The code fragment

	 ${${(M)afile%%(.tar|).(7z|bz2|gz)}#.}	

 would fail on files, which are of the pattern

	 zsh-4.2.5-doc.bz2  (only one extension) 

 or? (and all files, which are no Makefiles.... ;O)

 If I would have such an code fragment as desribed above, I would
 simply replace any ".tgz" string in a ".tar,gz" string afterwards
 (.tbz -> .tar.bz2 accordingly) and I would check for a ".tgz" string
 and then generate a ".tar.7z" string for the "-F<new format> part of
 the commandline to be fed into arepack.

 Dont hesitate to mail and ask again, Bart, if something is unclear --
 English isn't my mother's tongue...sorry.

 Have a nice weekend and thank you very much for your help and
 patience with my English in advance ! :)
 Meino

> On Aug 26,  6:32pm, Meino Christian Cramer wrote:
> } 
> }  I am currently wrting a little shell script, which encapsulates the
> }  new "arepack" addition of atool-0.31.0 (nice tool! use it! :O))).
> 
> I'm glad you answered zzapper's question because I was scratching my
> head over why it made a difference if the bzip'd file was also tar'd.
>  
> }  I am wondering, whether it would possible to strip off more than one
> }  "instance" of extension ("tar.bz2" instead of "bz2") from "$afile"
> 
> You mean e.g. ${${(M)afile%%(.tar|).(7z|bz2|gz)}#.} except that you
> don't want to have to enumerate (7z|bz2|gz)?  Otherwise I'm not clear
> on the question.
> 
> Incidentally if it's important to know about the "tar" part, then have
> you considered what to do with e.g. ".tgz" files?
> 

Re: ${i:r}-question

[Bart Schaefer]

On Aug 28,  2:55am, Meino Christian Cramer wrote:
} Subject: Re: ${i:r}-question
}
}  The code fragment
} 
} 	 ${${(M)afile%%(.tar|).(7z|bz2|gz)}#.}	
} 
}  would fail on files, which are of the pattern
} 
} 	 zsh-4.2.5-doc.bz2  (only one extension) 

What makes you think so?

schaefer[501] afile=zsh-4.2.5-doc.bz2
schaefer[502] print ${${(M)afile%%(.tar|).(7z|bz2|gz)}#.}
bz2
schaefer[503] afile=zsh-4.2.5-doc.tar.gz
schaefer[504] print ${${(M)afile%%(.tar|).(7z|bz2|gz)}#.}
tar.gz

Note that (.tar|) has an empty sub-pattern to the right of the vertical
bar, so it means ".tar or nothing".

}  or? (and all files, which are no Makefiles.... ;O)

I'm afraid I don't understand what you mean about files that are not
Makefiles.

Re: ${i:r}-question

[Meino Christian Cramer]

From: Bart Schaefer <schaefer@brasslantern.com>
Subject: Re: ${i:r}-question
Date: Sun, 28 Aug 2005 03:07:09 +0000

Hi Bart !

> On Aug 28,  2:55am, Meino Christian Cramer wrote:
> } Subject: Re: ${i:r}-question
> }
> }  The code fragment
> } 
> } 	 ${${(M)afile%%(.tar|).(7z|bz2|gz)}#.}	
> } 
> }  would fail on files, which are of the pattern
> } 
> } 	 zsh-4.2.5-doc.bz2  (only one extension) 
> 
> What makes you think so?
> 
> schaefer[501] afile=zsh-4.2.5-doc.bz2
> schaefer[502] print ${${(M)afile%%(.tar|).(7z|bz2|gz)}#.}
> bz2
> schaefer[503] afile=zsh-4.2.5-doc.tar.gz
> schaefer[504] print ${${(M)afile%%(.tar|).(7z|bz2|gz)}#.}
> tar.gz
> Note that (.tar|) has an empty sub-pattern to the right of the vertical
> bar, so it means ".tar or nothing".

  Ah, I see... !!! ENLIGHTMENT! (my previous reply...it was to deep in
  the night....sorry)

> 
> }  or? (and all files, which are no Makefiles.... ;O)
> 
> I'm afraid I don't understand what you mean about files that are not
> Makefiles.
> 

Oh shit...again a fault of mine (I should not write mails in the
night...) --> ${(M)afile was {${(M)akefile in my eyes...

I will try to make my script run with your suggestions, Bart !

Thanks a lot fo ryour help !

Keep zshing!
Meino