Tie::File insertion problem

Flubb has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks, I have a script which needs to insert a line into an html file after a certain point (ie, at the beginning of the html file.) We have a build system that I want take results from and present the most recent results first.
The script looks like: (I've redacted redundant information)

#!/usr/local/bin/perl -w
use strict;
use Env qw(COMPUTERNAME);
use Tie::File;
use File::Copy;
my(@cvscommits) = "";
my($cvscommits) ="";

my($buildresultserver) = "\\\\Cvs3b\\stuff\\";
my($htmloldfile) = "Verification_Builds1.html";
print "Going to server!\n";
chdir $buildresultserver or die "Cannot change to cvs3b $!\n";
print "going to tie the file\n";
tie @cvscommits, 'Tie::File', "$htmloldfile", or die "Cannot open $htm
+loldfile $!\n";
for (@cvscommits) {
    if (/<th>PC Number<\/th><th>Cores<\/th><th>Date<\/th><th>Customer<
+\/th><th>Target<\/th><th>C\/O Time<\/th><th>Build Time<\/th><th>Statu
+s<\/th><th>Changes from Last Build<\/th><tr>/) {
        print "Whee found it \n";
        $_ .= "<td><a href=\"\\\\$COMPUTERNAME\\$softdev\\$dirtime\"<b
+>$COMPUTERNAME</b></a></td><td>$processors</td><td>$dirtime</td><td>$
+cust</td><td>$target</td><td>$cotime</td><td>$buildtime</td><td>$resu
+lt</td><tr>@cvscommits</tr>\n";
last;
}}

untie @cvscommits;
[download]

I've been following a previous answer:
http://www.perlmonks.org/?node_id=155567
What I thought the script was going to do
Go to the file on the server and open it into an array
Search for the pattern that begins with <th>PC Number... and then after that line, insert my line <td><a href...
What is actually happening is that the contents of the html get copied repeatedly every time the script is run, so I get two copies of the contents, rather than the 1 line added I thought I was going to get. It finds the <th>PC Number</th> but then tacks the entire contents of the file onto the end of that line.
The html code is simply the following:

<html>
<head>
<title>  BUILD ENVIRONMENT INFORMATION </title>
<STYLE type="text/css">
</STYLE>
</head>

<body><hr>
<h2><center> Daily Verification </center></h2>
<table border="1">
<tr>
<th>PC Number</th><th>Cores</th><th>Date</th><th>Customer</th><th>Targ
+et</th><th>C/O Time</th><th>Build Time</th><th>Status</th><th>Changes
+ from Last Build</th><tr>
[download]

And then my script is supposed to add things to the top of the file. Can anyone enlighten me why it's not doing what I thought it would?

Comment on Tie::File insertion problem Select or Download Code

Replies are listed 'Best First'.
Re: Tie::File insertion problem by citromatik (Curate) on Jan 31, 2008 at 16:47 UTC
In: `$_ .= "<td><a href=\"\\\\$COMPUTERNAME\\$softdev\\$dirtime\"<b +>$COMPUTERNAME</b></a></td><td>$processors</td><td>$dirtime</td><td>$ +cust</td><td>$target</td><td>$cotime</td><td>$buildtime</td><td>$resu +lt</td><tr>@cvscommits</tr>\n";` [download] You are including the `@cvscommits` entire array, which happens to be tied to your html file. That is causing that the entire file is being inserted in that place citromatik	[reply] [d/l] [select]
Re^2: Tie::File insertion problem by Flubb (Acolyte) on Feb 01, 2008 at 10:33 UTC
Please tell me where I can buy your eagle eyes :( Thanks :)	[reply]