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Perl-Users Digest, Issue: 2086 Volume: 11

daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Tue Dec 30 09:09:44 2008

Date: Tue, 30 Dec 2008 06:09:08 -0800 (PST)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)

Perl-Users Digest           Tue, 30 Dec 2008     Volume: 11 Number: 2086

Today's topics:
    Re: Can I drop/create a database with DBI? yairl@savion.huji.ac.il
        fail running an external C program into a Perl CGI scri yairl@savion.huji.ac.il
    Re: fail running an external C program into a Perl CGI  <smallpond@juno.com>
    Re: fail running an external C program into a Perl CGI  <jurgenex@hotmail.com>
    Re: Is there any IDE for perl? <check.sig@for.email.invalid>
    Re: Is there any IDE for perl? yairl@savion.huji.ac.il
    Re: Is there any IDE for perl? <wahab-mail@gmx.de>
        oops <wahab-mail@gmx.de>
        Posting Guidelines for comp.lang.perl.misc ($Revision:  tadmc@seesig.invalid
    Re: searching for franken <rvtol+usenet@isolution.nl>
    Re: searching for franken <wahab-mail@gmx.de>
    Re: Unit test that checks for "croak" <rvtol+usenet@isolution.nl>
        Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)

----------------------------------------------------------------------

Date: Tue, 30 Dec 2008 02:37:29 -0800 (PST)
From: yairl@savion.huji.ac.il
Subject: Re: Can I drop/create a database with DBI?
Message-Id: <5d093faa-d991-4ae3-ab7d-11bd665dd990@r36g2000prf.googlegroups.com>

On Dec 29, 3:33=A0am, David Filmer <use...@davidfilmer.com> wrote:
> Is it possible to drop/create a database with DBI?
>
> Thanks!
>
> --
> David Filmer (http://DavidFilmer.com)
> The best way to get a good answer is to ask a good question.

yes, you can but you need the correct database permitions for this. i
do it using DBD::mysql there aren't any problem, when something was
wrong was because i don't have permition to create or drop.


------------------------------

Date: Tue, 30 Dec 2008 01:59:49 -0800 (PST)
From: yairl@savion.huji.ac.il
Subject: fail running an external C program into a Perl CGI script
Message-Id: <9ba0cd57-96af-4028-9470-65b3ca370357@s9g2000prm.googlegroups.com>

hi,

I 'm trying to execute a small C program into the Perl CGI working
with apache server and it fail . I used `cmd` , sytem, qx( ) , open
orders every thing it doens't work when it run as CGI. The script
works fine if it runs as shell script by hand or cron but the forked
program send "segmentation fault" and it ended with status 35584
(ACCESS VIOLATION) when it runs into CGI mode under apache server or
Sun One webserver. This happened with some C small programs they use
socket to connect some resources outside and return some value to
evaluate. These programs started to fail since perl 5.6 under linux
SuSe 9 ,10 and solaris 8 and 9. The regular OS orders like date, cat ,
cal work fine, I tested it. I don't understand why is happened, what's
wrong they are common C progrmas using the standard C library like
socket lib. Someone know anything about this bug?


------------------------------

Date: Tue, 30 Dec 2008 05:27:24 -0800 (PST)
From: smallpond <smallpond@juno.com>
Subject: Re: fail running an external C program into a Perl CGI script
Message-Id: <9ca483f8-0127-40d1-90ce-e90d0fc84fed@40g2000prx.googlegroups.com>

On Dec 30, 4:59 am, ya...@savion.huji.ac.il wrote:
> hi,
>
> I 'm trying to execute a small C program into the Perl CGI working
> with apache server and it fail . I used `cmd` , sytem, qx( ) , open
> orders every thing it doens't work when it run as CGI. The script
> works fine if it runs as shell script by hand or cron but the forked
> program send "segmentation fault" and it ended with status 35584
> (ACCESS VIOLATION) when it runs into CGI mode under apache server or
> Sun One webserver. This happened with some C small programs they use
> socket to connect some resources outside and return some value to
> evaluate. These programs started to fail since perl 5.6 under linux
> SuSe 9 ,10 and solaris 8 and 9. The regular OS orders like date, cat ,
> cal work fine, I tested it. I don't understand why is happened, what's
> wrong they are common C progrmas using the standard C library like
> socket lib. Someone know anything about this bug?


Most likely you are trying to execute a program in a directory
or as a user that does not have proper permission.  This is
more likely an apache problem than perl.  Check httpd.conf.



------------------------------

Date: Tue, 30 Dec 2008 05:54:18 -0800
From: Jürgen Exner <jurgenex@hotmail.com>
Subject: Re: fail running an external C program into a Perl CGI script
Message-Id: <jt9kl411og6tqf3utrtaec94ne5uslickr@4ax.com>

yairl@savion.huji.ac.il wrote:
>I 'm trying to execute a small C program into the Perl CGI working
>with apache server and it fail . I used `cmd` , sytem, qx( ) , open
>orders every thing it doens't work when it run as CGI. The script
>works fine if it runs as shell script by hand or cron but the forked
>program send "segmentation fault" and it ended with status 35584
>(ACCESS VIOLATION) when it runs into CGI mode under apache server or
>Sun One webserver. 

You have a close cousin to "Server error 500", see "perldoc -q 500" for
details.

jue


------------------------------

Date: Tue, 30 Dec 2008 12:03:49 +0200
From: Alex <check.sig@for.email.invalid>
Subject: Re: Is there any IDE for perl?
Message-Id: <2mm6l.111210$_03.74527@reader1.news.saunalahti.fi>

George wrote:
> On Mon, 29 Dec 2008 04:59:04 -0800 (PST), mobile.parmenides@gmail.com
> wrote:
>>    My experience concerning the c programming tell me an IED is very
>> important for coding and debugging. Is there perl counterpart?
> 
> There's komodo from the activestate people.  It costs some money and is
> likely a very effective tool for persons who can afford it.

If you don't *need* the letters "IDE" in the name, you can also try out
the editor "Komodo Edit", which is pretty good, IMHO, and which you can
download for free. Of course, you can try out the trial version of
"Komodo IDE", which has some extra features, which you may like.

Alex
-- 
localpart = alext
domain = iki dot fi
email = localpart at domain


------------------------------

Date: Tue, 30 Dec 2008 02:31:45 -0800 (PST)
From: yairl@savion.huji.ac.il
Subject: Re: Is there any IDE for perl?
Message-Id: <8095e293-a6e6-44e1-8717-3eadc2916f07@o4g2000pra.googlegroups.com>

On Dec 29, 2:59=A0pm, mobile.parmeni...@gmail.com wrote:
> Hi,
>
> =A0 =A0My experience concerning the c programming tell me an IED is very
> important for coding and debugging. Is there perl counterpart?

I ussually use emacs with perl mode but in the last years for big
projects i started to use an IDE. I use eclipse with the perl plug ,
it's very good for me. It helps to find quickly objects,
function ,variables into 20 or 30 different files and this was reason
i needed to change the emacs. For small changes i still use emacs, but
when we must make big changes no way , i can't see what happen in
others objects or methods without eclipse. The problem is how to see
the different project's parts in different files working together and
thus avoid bugs....
Untill now there isn't any good emacs module it can do this work .


------------------------------

Date: Tue, 30 Dec 2008 14:24:21 +0100
From: Mirco Wahab <wahab-mail@gmx.de>
Subject: Re: Is there any IDE for perl?
Message-Id: <gjd7j7$gfm$2@mlucom4.urz.uni-halle.de>

sln@netherlands.com wrote:
> On Mon, 29 Dec 2008 15:04:37 -0700, George <george@example.invalid> wrote:
> 
>> On Mon, 29 Dec 2008 04:59:04 -0800 (PST), mobile.parmenides@gmail.com
>> wrote:
>>
>>> Hi,
>>>
>>>    My experience concerning the c programming tell me an IED is very
>>> important for coding and debugging. Is there perl counterpart?
>> There's komodo from the activestate people.  It costs some money and is
>> likely a very effective tool for persons who can afford it.
>>
>> Activestate also has a free perl install for windows that has the
>> all-important package manager.  You have to take steps to customize it, and
>> there's no ide.  With an interpreted syntax like perl, I actually prefer
>> the command line to the ide.  It's not like my projects are large.
>>
>> If there's one thing I miss now that I'm relegated to relying on the free
>> distros, it's a visual debugger like I had back when I used M$.
> And intellisence.

EPIC (http://www.epic-ide.org/index.php) has
intellisense and integrated debugger.

Regards

M.


------------------------------

Date: Tue, 30 Dec 2008 14:15:39 +0100
From: Mirco Wahab <wahab-mail@gmx.de>
Subject: oops
Message-Id: <gjd72u$gfm$1@mlucom4.urz.uni-halle.de>

Mirco Wahab wrote:
> George wrote:
>> T.J.McC
>>> Mirco Wahab <wahab-mail@gmx.de> wrote:
>>>> while($html =~ /$what/mg) { # note the /m modifier
>>> Note that the /m modifier does absolutely nothing for the pattern
>>> being used, and so is not needed at all.

sorry for

> It prevents the dot from matching across line
> boundaries, as you surely know.

providing BS explanations. Seems like I'm getting old
and/or suffer from missing opportunities to practice
Perl Regex enough (as compared to Boost and PHP).


Thanks for your initial correction,

Mirco


------------------------------

Date: Tue, 30 Dec 2008 08:07:58 GMT
From: tadmc@seesig.invalid
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.8 $)
Message-Id: <yFk6l.7850$8_3.5390@flpi147.ffdc.sbc.com>

Outline
   Before posting to comp.lang.perl.misc
      Must
       - Check the Perl Frequently Asked Questions (FAQ)
       - Check the other standard Perl docs (*.pod)
      Really Really Should
       - Lurk for a while before posting
       - Search a Usenet archive
      If You Like
       - Check Other Resources
   Posting to comp.lang.perl.misc
      Is there a better place to ask your question?
       - Question should be about Perl, not about the application area
      How to participate (post) in the clpmisc community
       - Carefully choose the contents of your Subject header
       - Use an effective followup style
       - Speak Perl rather than English, when possible
       - Ask perl to help you
       - Do not re-type Perl code
       - Provide enough information
       - Do not provide too much information
       - Do not post binaries, HTML, or MIME
      Social faux pas to avoid
       - Asking a Frequently Asked Question
       - Asking a question easily answered by a cursory doc search
       - Asking for emailed answers
       - Beware of saying "doesn't work"
       - Sending a "stealth" Cc copy
      Be extra cautious when you get upset
       - Count to ten before composing a followup when you are upset
       - Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------

Posting Guidelines for comp.lang.perl.misc ($Revision: 1.8 $)
    This newsgroup, commonly called clpmisc, is a technical newsgroup
    intended to be used for discussion of Perl related issues (except job
    postings), whether it be comments or questions.

    As you would expect, clpmisc discussions are usually very technical in
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    The article at:

        http://www.catb.org/~esr/faqs/smart-questions.html

    describes how to get answers from technical people in general.

    This article describes things that you should, and should not, do to
    increase your chances of getting an answer to your Perl question. It is
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     http://www.rehabitation.com/clpmisc.shtml

    For more information about netiquette in general, see the "Netiquette
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     http://andrew2.andrew.cmu.edu/rfc/rfc1855.html

    A note to newsgroup "regulars":

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       In this document, we use words like "must" and "should" as
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    Do *NOT* send email to the maintainer of these guidelines. It will be
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Before posting to comp.lang.perl.misc
  Must
    This section describes things that you *must* do before posting to
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    The perl distribution includes documentation that is copied to your hard
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    You should either find out where the docs got installed on your system,
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    Check the Perl Frequently Asked Questions (FAQ)
        Checking the FAQ before posting is required in Big 8 newsgroups in
        general, there is nothing clpmisc-specific about this requirement.
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        You can use the "-q" switch with perldoc to do a word search of the
        questions in the Perl FAQs.

    Check the other standard Perl docs (*.pod)
        The perl distribution comes with much more documentation than is
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        see if you can find an answer in the other (non-FAQ) standard docs
        before posting.

    It is *not* required, or even expected, that you actually *read* all of
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    Try doing a word-search in the standard docs for some words/phrases
    taken from your problem statement or from your very carefully worded
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  Really Really Should
    This section describes things that you *really should* do before posting
    to clpmisc.

    Lurk for a while before posting
        This is very important and expected in all newsgroups. Lurking means
        to monitor a newsgroup for a period to become familiar with local
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        situations. Consider yourself to be a foreigner at first!

    Search a Usenet archive
        There are tens of thousands of Perl programmers. It is very likely
        that your question has already been asked (and answered). See if you
        can find where it has already been answered.

        One such searchable archive is:

         http://groups.google.com/advanced_group_search

  If You Like
    This section describes things that you *can* do before posting to
    clpmisc.

    Check Other Resources
        You may want to check in books or on web sites to see if you can
        find the answer to your question.

        But you need to consider the source of such information: there are a
        lot of very poor Perl books and web sites, and several good ones
        too, of course.

Posting to comp.lang.perl.misc
    There can be 200 messages in clpmisc in a single day. Nobody is going to
    read every article. They must decide somehow which articles they are
    going to read, and which they will skip.

    Your post is in competition with 199 other posts. You need to "win"
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    These sections describe how you can help keep your article from being
    one of the "skipped" ones.

  Is there a better place to ask your question?
    Question should be about Perl, not about the application area
        It can be difficult to separate out where your problem really is,
        but you should make a conscious effort to post to the most
        applicable newsgroup. That is, after all, where you are the most
        likely to find the people who know how to answer your question.

        Being able to "partition" a problem is an essential skill for
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        that right, you end up looking for answers in the wrong places.

        It should be understood that you may not know that the root of your
        problem is not Perl-related (the two most frequent ones are CGI and
        Operating System related), so off-topic postings will happen from
        time to time. Be gracious when someone helps you find a better place
        to ask your question by pointing you to a more applicable newsgroup.

  How to participate (post) in the clpmisc community
    Carefully choose the contents of your Subject header
        You have 40 precious characters of Subject to win out and be one of
        the posts that gets read. Don't waste them. Take care while
        composing them, they are the key that opens the door to getting an
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        Spend them indicating what aspect of Perl others will find if they
        should decide to read your article.

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        Subject Lines":

         http://www.cpan.org/authors/id/D/DM/DMR/subjects.post

        Part of the beauty of newsgroup dynamics, is that you can contribute
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    Use an effective followup style
        When composing a followup, quote only enough text to establish the
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        Intersperse your comments *following* each section of quoted text to
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        "top-posting", "Jeopardy" (because the answer comes before the
        question), or "TOFU" (Text Over, Fullquote Under).

        Reversing the chronology of the dialog makes it much harder to
        understand (some folks won't even read it if written in that style).
        For more information on quoting style, see:

         http://web.presby.edu/~nnqadmin/nnq/nquote.html

    Speak Perl rather than English, when possible
        Perl is much more precise than natural language. Saying it in Perl
        instead will avoid misunderstanding your question or problem.

        Do not say: I have variable with "foo\tbar" in it.

        Instead say: I have $var = "foo\tbar", or I have $var = 'foo\tbar',
        or I have $var = <DATA> (and show the data line).

    Ask perl to help you
        You can ask perl itself to help you find common programming mistakes
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        You should not bother the hundreds/thousands of readers of the
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        you can put "use diagnostics;" near the top of your program.

    Do not re-type Perl code
        Use copy/paste or your editor's "import" function rather than
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        trying to get answered.

    Provide enough information
        If you do the things in this item, you will have an Extremely Good
        chance of getting people to try and help you with your problem!
        These features are a really big bonus toward your question winning
        out over all of the other posts that you are competing with.

        First make a short (less than 20-30 lines) and *complete* program
        that illustrates the problem you are having. People should be able
        to run your program by copy/pasting the code from your article. (You
        will find that doing this step very often reveals your problem
        directly. Leading to an answer much more quickly and reliably than
        posting to Usenet.)

        Describe *precisely* the input to your program. Also provide example
        input data for your program. If you need to show file input, use the
        __DATA__ token (perldata.pod) to provide the file contents inside of
        your Perl program.

        Show the output (including the verbatim text of any messages) of
        your program.

        Describe how you want the output to be different from what you are
        getting.

        If you have no idea at all of how to code up your situation, be sure
        to at least describe the 2 things that you *do* know: input and
        desired output.

    Do not provide too much information
        Do not just post your entire program for debugging. Most especially
        do not post someone *else's* entire program.

    Do not post binaries, HTML, or MIME
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        you include code, cut and paste it directly in the message body.
        Don't attach anything to the message. Don't post vcards or HTML.
        Many people (and even some Usenet servers) will automatically filter
        out such messages. Many people will not be able to easily read your
        post. Plain text is something everyone can read.

  Social faux pas to avoid
    The first two below are symptoms of lots of FAQ asking here in clpmisc.
    It happens so often that folks will assume that it is happening yet
    again. If you have looked but not found, or found but didn't understand
    the docs, say so in your article.

    Asking a Frequently Asked Question
        It should be understood that you may have missed the applicable FAQ
        when you checked, which is not a big deal. But if the Frequently
        Asked Question is worded similar to your question, folks will assume
        that you did not look at all. Don't become indignant at pointers to
        the FAQ, particularly if it solves your problem.

    Asking a question easily answered by a cursory doc search
        If folks think you have not even tried the obvious step of reading
        the docs applicable to your problem, they are likely to become
        annoyed.

        If you are flamed for not checking when you *did* check, then just
        shrug it off (and take the answer that you got).

    Asking for emailed answers
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        entire community. If folks can take the time to answer your
        question, then you can take the time to go get the answer in the
        same place where you asked the question.

        It is OK to ask for a *copy* of the answer to be emailed, but many
        will ignore such requests anyway. If you munge your address, you
        should never expect (or ask) to get email in response to a Usenet
        post.

        Ask the question here, get the answer here (maybe).

    Beware of saying "doesn't work"
        This is a "red flag" phrase. If you find yourself writing that,
        pause and see if you can't describe what is not working without
        saying "doesn't work". That is, describe how it is not what you
        want.

    Sending a "stealth" Cc copy
        A "stealth Cc" is when you both email and post a reply without
        indicating *in the body* that you are doing so.

  Be extra cautious when you get upset
    Count to ten before composing a followup when you are upset
        This is recommended in all Usenet newsgroups. Here in clpmisc, most
        flaming sub-threads are not about any feature of Perl at all! They
        are most often for what was seen as a breach of netiquette. If you
        have lurked for a bit, then you will know what is expected and won't
        make such posts in the first place.

        But if you get upset, wait a while before writing your followup. I
        recommend waiting at least 30 minutes.

    Count to ten after composing and before posting when you are upset
        After you have written your followup, wait *another* 30 minutes
        before committing yourself by posting it. You cannot take it back
        once it has been said.

AUTHOR
    Tad McClellan and many others on the comp.lang.perl.misc newsgroup.

-- 
Tad McClellan
email: perl -le "print scalar reverse qq/moc.noitatibaher\100cmdat/"


------------------------------

Date: Tue, 30 Dec 2008 10:51:14 +0100
From: "Dr.Ruud" <rvtol+usenet@isolution.nl>
Subject: Re: searching for franken
Message-Id: <4959ef13$0$189$e4fe514c@news.xs4all.nl>

George wrote:

> # shebang doesn't work on windows

Stop putting that in your scripts. Start reading the documentation.

In short: the path or even the name of the binary don't matter, but the 
options do.

Unless of course you would bind .pl to a shebang.com that would just do 
what you once expected.

-- 
Ruud


------------------------------

Date: Tue, 30 Dec 2008 12:17:44 +0100
From: Mirco Wahab <wahab-mail@gmx.de>
Subject: Re: searching for franken
Message-Id: <gjd05r$eg9$1@mlucom4.urz.uni-halle.de>

George wrote:
>> Mirco Wahab <wahab-mail@gmx.de> wrote:
>>>   while($html =~ /$what/mg) { # note the /m modifier
>> Note that the /m modifier does absolutely nothing for the pattern
>> being used, and so is not needed at all.

It prevents the dot from matching across line
boundaries, as you surely know.

>> You probably meant the /s modifier instead?

not really

> I think this is a significant issue and is where I'm stumbling right now:

George, what you  probably intend to do is, as anybody
noted, "web scraping" which has to be applied (in your
case) to some ill structured html source. What I'd use
here is a kind of 'quick and dirty' regular expression
search.


I looked into your html source and conceived something
that does the job somehow. Please try to learn some
basics of regular expressions, eg.: from here:
http://oreilly.com/catalog/9781565922570/

my hack on your problem:

  use strict;
  use warnings;
  use LWP::Simple;

  # load the complete content of the url in question
  # via LWP::Simple::get(...)
  my $t = get 'http://www.alfrankensense.com/al_franken_quotes.html';

  # inspect the web site and look at what "marker"
  # your stuff usually starts, in your case - it's the tag:
  #         <center>Al Franken Quotes</center>

  my @quotes; # array, where the quotes are to be collected

  # *If* we got there:
  if($t =~ /<center>Al Franken Quotes<\/center>/g) { # the inner / is ecscaped
     # then we write a quick & dirty regular expression
     # to map on the quote (look in the html for hints)
     my $q = qr{ \t         # the quote is always preceeded by a tab
                 "([^"]+)"  # find ", save all (saved to $1), to another "
                 .+?        # fine, now look up  a '-' followed by whitespace
                 \-\s+      # which comes here (escaped -) ..
                 ([^<]+)    # this has to be the quote source until next html tag
               }sx;   # the /s lets the .(dot) match across lines
                      # the /x allows us to format and comment this expression

     # apply this expression to the text
     while($t=~ /$q/g) { # /g in scalar context (look it up)
        push @quotes, [$1, $2];  # save found quote on array
     }                           # quote in $1, source in $2
  }

  print "total: " . scalar @quotes . " quotes found\n";

  for my $q (@quotes) {           # now show what quotes we found
     print_nice($q->[0], $q->[1]) # and format them however you want
  }
  # thats it

  # we need to provide our special formatting subroutine
  sub print_nice {
     my($q, $s) = @_; # shift actual arguments into variables
     $q =~ s/\s+/ /g;    # quote: transfer multiple whitespace to a single space
     $q =~ s/<[^>]+>//g; # quote: remove html formatting
     $s =~ s/\s+/ /g;    # source: same here
     $s =~ s/<[^>]+>//g; # source: same here
     print "$q"                # print quote, followed by ...
         . "\n" . '-'x40 ."\n" # new line + 40 x '-' + new line
         . "- $s\n\n"          # '-' + quote source + double \n
  }



Regards

M.


------------------------------

Date: Tue, 30 Dec 2008 11:01:59 +0100
From: "Dr.Ruud" <rvtol+usenet@isolution.nl>
Subject: Re: Unit test that checks for "croak"
Message-Id: <4959f198$0$189$e4fe514c@news.xs4all.nl>

Tim Greer wrote:
> sln@netherlands.com wrote:
>> Dr.Ruud:

>>> I promote to test the return value of eval.
>>    ^^^^^^^
>> what do you mean?
> 
> Probably he promotes that method of doing it, unless it meant propose.

I mean "promote". There are known issues in Perl with $@, like $@ 
loosing a value, like with DESTROY.
I already proposed @@, so $@[-1] would hold the last one.

And I just hate the decoupled way of "if ($@){}", it is far too distant 
for my taste. The Perl compiler needs to do crazy things to try to make 
$@ to be about the previous statement (or block) as much as possible.

-- 
Ruud


------------------------------

Date: 6 Apr 2001 21:33:47 GMT (Last modified)
From: Perl-Users-Request@ruby.oce.orst.edu (Perl-Users-Digest Admin) 
Subject: Digest Administrivia (Last modified: 6 Apr 01)
Message-Id: <null>


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