Truncate without padding

Truncate without padding

[DervishD]

    Hi all :)

    I would like to print a string truncated *but* without padding,
so I cannot use the "l" and "r" parameter expansion flags. Of course,
I could use the "%" parameter expansion flag and use %>STRING>, but I
don't want the string to be prompt-expanded.

    I know I can use "printf" or "zformat" for that, but I was
wondering if this can be done using "print" and some form of
expansion. I need to use "print" because sometimes I have to do
translation of echo escape sequences and sometimes not, and I've
implemented that using optionally the "-r" option to "print". I can
switch to printf and do any translation before, but I would like to
use the current code and not switch to printf or zformat.

    Thanks a lot in advance :)

    Raúl Núñez de Arenas Coronado

-- 
Linux Registered User 88736 | http://www.dervishd.net
http://www.pleyades.net & http://www.gotesdelluna.net
It's my PC and I'll cry if I want to...

Re: Truncate without padding

[Bart Schaefer]

On Oct 31, 12:27pm, DervishD wrote:
}
}     I would like to print a string truncated *but* without padding

Just truncate it first with padding, and then strip the padding.

    ${${(pl:WIDTH::::\0:)string}#*$'\0'}
    ${${(pr:WIDTH::::\0:)string}%$'\0'*}

You can pick some other character than NUL if you know that character
doesn't appear in the string, in which case you don't need the (p) flag.

Re: Truncate without padding

[DervishD]

    Hi Bart :)

 * Bart Schaefer <schaefer@brasslantern.com> dixit:
> On Oct 31, 12:27pm, DervishD wrote:
> }
> }     I would like to print a string truncated *but* without padding
> 
> Just truncate it first with padding, and then strip the padding.

    Sorry, I didn't mention that it has to be done in one step
(namely in the print command) and the "string" to be printed is $*.

    I think I could save "$*" in a parameter (it won't be splitted
nor any other thing except printed) and apply your solution :)
Anyway, is there a way of doing all in one step, with the
restrictions I mention above?

> You can pick some other character than NUL if you know that
> character doesn't appear in the string, in which case you don't
> need the (p) flag.

    It's OK to use '\0' if I apply this solution, althoug it is not
needed because ALL pad characters will be " " and ALL pad characters
will be added by the pad flags. The string won't have trailing or
leading spaces (well, it is not supossed to...) Thanks :)

    Raúl Núñez de Arenas Coronado

-- 
Linux Registered User 88736 | http://www.dervishd.net
http://www.pleyades.net & http://www.gotesdelluna.net
It's my PC and I'll cry if I want to...

Re: Truncate without padding

[DervishD]

    Hi Bart :)

 * Bart Schaefer <schaefer@brasslantern.com> dixit:
> On Oct 31, 12:27pm, DervishD wrote:
> }
> }     I would like to print a string truncated *but* without padding
> 
> Just truncate it first with padding, and then strip the padding.
> 
>     ${${(pl:WIDTH::::\0:)string}#*$'\0'}
>     ${${(pr:WIDTH::::\0:)string}%$'\0'*}

    I finally modified the shell function to do all string processing
first. After that, I just do "print $_rawmode -n -- $_string". So I
can do the printing in one step and the string processing in two (one
is the truncation+padding, the second is the optional padding
removal).

    I'm afraid I was misreading your suggestion: both things were done
in just one step and I thought the first expansion was the truncation
and padding and the second the padding removal. Sorry for the noise
and thanks a lot, as always, for your kind help.

    When I test the function I will probably post it here just in
case the code can be improved or anyone is interested in using it.

    Thanks again :)

    Raúl Núñez de Arenas Coronado

-- 
Linux Registered User 88736 | http://www.dervishd.net
http://www.pleyades.net & http://www.gotesdelluna.net
It's my PC and I'll cry if I want to...