FYI: BashDiff

FYI: BashDiff

[Daniel Qarras]

Hi,

just a FYI, there's a patch set for Bash that implements numerous new
features, many of them are already in Zsh and few are IMHO pointless
but a couple of them look pretty interesting to me. YMMV.

http://home.eol.ca/~parkw/index.html

Thanks.




      ____________________________________________________________________________________
Check out the hottest 2008 models today at Yahoo! Autos.
http://autos.yahoo.com/new_cars.html

Re: FYI: BashDiff

[Christopher Browne]

On 10/3/07, Daniel Qarras <dqarras@yahoo.com> wrote:
> just a FYI, there's a patch set for Bash that implements numerous new
> features, many of them are already in Zsh and few are IMHO pointless
> but a couple of them look pretty interesting to me. YMMV.
>
> http://home.eol.ca/~parkw/index.html

I know William quite well; he did a couple of talks about this for our
Linux User Group here in Toronto, and we have both served on the Board
of Directors for the LUG...

http://gtalug.org/wiki/Meetings:2004-09

He started the effort by seeing features in Perl that he'd rather use in Bash.
He found it somewhat frustrating that the Bash developers were
reluctant to accept any of his changes.

Some of the control structures seemed pretty dubious to me, but it
seems good to me that he is trying to do some substantive
improvements.
-- 
http://linuxfinances.info/info/linuxdistributions.html
"...  memory leaks  are  quite acceptable  in  many applications  ..."
(Bjarne Stroustrup, The Design and Evolution of C++, page 220)

(alpha sequence missing in zsh) Re: FYI: BashDiff

[Marc Chantreux]

> just a FYI, there's a patch set for Bash that implements numerous new
> features, many of them are already in Zsh 

It reminds me that i found a usefull feature in bash that is missing in 
zsh:  {a..z} to gen an alpha sequence.

regards

marc

Re: (alpha sequence missing in zsh) Re: FYI: BashDiff

[Stephane Chazelas]

On Tue, Oct 09, 2007 at 09:32:40AM +0200, Marc Chantreux wrote:
>
>> just a FYI, there's a patch set for Bash that implements numerous new
>> features, many of them are already in Zsh 
>
> It reminds me that i found a usefull feature in bash that is missing in 
> zsh:  {a..z} to gen an alpha sequence.
[...]

~$ setopt braceccl
~$ echo {a-z}
a b c d e f g h i j k l m n o p q r s t u v w x y z

-- 
Stéphane

Re: (alpha sequence missing in zsh) Re: FYI: BashDiff

[Marc Chantreux]

Stephane Chazelas a écrit :
> ~$ setopt braceccl
> ~$ echo {a-z}
> a b c d e f g h i j k l m n o p q r s t u v w x y z

wow ! thanks :)

Re: (alpha sequence missing in zsh) Re: FYI: BashDiff

[Zvi Har'El]

[-- Attachment #1: Type: text/plain, Size: 1824 bytes --]

I wondered why the diffence betwen the {1..9} and {a-z} syntax, and read
the BRACE EXPANSION section in zshexpn(1). It says


     An expression of the form ‘{n1..n2}’, where n1 and n2 are integers, is
       expanded to every number between n1 and n2 inclusive.  If either 
num‐
       ber  begins with a zero, all the resulting numbers will be padded
with
       leading zeroes to that minimum width.  If the numbers are in 
decreas‐
       ing order the resulting sequence will also be in decreasing order.

       If  a  brace  expression  matches  none of the above forms, it is
left
       unchanged, unless the BRACE_CCL option is set.  In that  case, 
it  is
       expanded  to  a  sorted  list of the individual characters
between the
       braces, in the manner of a search set.  ‘−’ is treated specially
as in
       a  search  set,  but ‘^’ or ‘!’ as the first character is treated
nor‐
       mally.


I wonder: What is a "search set"? I couldn't find it anywhere in zshall(1).



On 09/10/07 09:44, Stephane Chazelas wrote:

> On Tue, Oct 09, 2007 at 09:32:40AM +0200, Marc Chantreux wrote:
>   
>>> just a FYI, there's a patch set for Bash that implements numerous new
>>> features, many of them are already in Zsh 
>>>       
>> It reminds me that i found a usefull feature in bash that is missing in 
>> zsh:  {a..z} to gen an alpha sequence.
>>     
> [...]
>
> ~$ setopt braceccl
> ~$ echo {a-z}
> a b c d e f g h i j k l m n o p q r s t u v w x y z
>
>   

-- 
Dr. Zvi Har'El      mailto:rl@math.technion.ac.il    Department of Mathematics
tel:+972-54-4227607                  Technion - Israel Institute of Technology
fax:+972-4-8293388  http://www.math.technion.ac.il/~rl/    Haifa 32000, ISRAEL
"If you can't say somethin' nice, don't say nothin' at all." -- Thumper (1942)


[-- Attachment #2: Type: text/html, Size: 3094 bytes --]

Re: (alpha sequence missing in zsh) Re: FYI: BashDiff

[Peter Stephenson]

On Tue, 09 Oct 2007 10:29:24 +0200
"Zvi Har'El" <rl@math.technion.ac.il> wrote:
> I wondered why the diffence betwen the {1..9} and {a-z} syntax, and read
> the BRACE EXPANSION section in zshexpn(1).

The difference in syntax is historical.  The BRACE_CCL form came earlier,
out of zsh prehistory.  I wanted to add a numeric form that didn't depend
on BRACE_CCL and borrowed the syntax for that from Perl since it didn't
look like an expression you'd have by accident.

> I wonder: What is a "search set"? I couldn't find it anywhere in zshall(1).

It simply means a [...] pattern expression.  This bit isn't very helpful.

I note multibyte characters aren't handled.  That probably isn't much of an
issue for X-Y but you might want to be able to use individual ones.  That
looks like it would be a little work.

Index: Doc/Zsh/expn.yo
===================================================================
RCS file: /cvsroot/zsh/zsh/Doc/Zsh/expn.yo,v
retrieving revision 1.81
diff -u -r1.81 expn.yo
--- Doc/Zsh/expn.yo	22 Aug 2007 10:46:42 -0000	1.81
+++ Doc/Zsh/expn.yo	9 Oct 2007 08:51:55 -0000
@@ -1229,12 +1229,17 @@
 resulting sequence will also be in decreasing order.
 
 If a brace expression matches none of the above forms, it is left
-unchanged, unless the tt(BRACE_CCL) option is set.
+unchanged, unless the option tt(BRACE_CCL) (an abbreviation for `brace
+character class') is set.
 pindex(BRACE_CCL, use of)
-In that case, it is expanded to a sorted list of the individual
-characters between the braces, in the manner of a search set.
-`tt(-)' is treated specially as in a search set, but `tt(^)' or `tt(!)' as
-the first character is treated normally.
+In that case, it is expanded to a list of the individual
+characters between the braces sorted into the order of the characters
+in the ASCII character set (multibyte characters are not currently
+handled).  The syntax is similar to a
+tt([)...tt(]) expression in filename generation:
+`tt(-)' is treated specially to denote a range of characters, but `tt(^)' or
+`tt(!)' as the first character is treated normally.  For example,
+`tt({abcdef0-9})' expands to 16 words tt(0 1 2 3 4 5 6 7 8 9 a b c d e f).
 
 Note that brace expansion is not part of filename generation (globbing); an
 expression such as tt(*/{foo,bar}) is split into two separate words


-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070