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  73                       <li class="asset-meta-list-item">Posted on <time datetime="2005-12-07T17:44:50-08:00" itemprop="datePublished">December  7, 2005</time></li>
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  84                   <ul>
  85   <li>Changed bin_merge to be a module so that it easier to call from UCMCustom</li>
  86
  87   <li>Integrated new BinMerge.pm module into the UCMCustom</li>
  88
  89   <li>Added fix to use "\" in get_vob_str</li>
  90
  91   <li>Changed UCMCustom to use strict and warnings(we should always use these)</li>
  92
  93   <li>Changed UCMCustom to use use instead of require</li>
  94
  95   <li>Hunted down bug where UCMCustom undef's $/ (Bad UCMCustom!! Bad!)</lI>
  96 </ul>
  97                   <h2>BinMerge Module</h2>
  98
  99 <p>I decided to change bin_merge into a module (BinMerge) and use it in UCMCustom. I was having problems trying to start the bin_merge process and getting it going in a pipe so the output from verbose could give the user feed back. For some reason bin_merge has to exit before any output was returned. Might have been because of the $/ thing described below (Bad UCMCustom, bad!)</p>
 100
 101 <h2>Using strict</h2>
 102
 103 <p>I've been taught that both use strict and use warnings should always be used when coding Perl. These diagnoistic routines are helpful in catching some common Perl mistakes that are otherwise much more difficult to debug. In fact, in implementing this I found a few potential bugs that I also corrected.</p>
 104
 105 <blockquote>
 106 <p><b>Note:</b> Some version of Perl do not have use warnings. Instead specify -w on the #! line.</p>
 107 </blockquote>
 108
 109 <h2>Use vs Require</h2>
 110
 111 <p>Require is old hat. Use is the new require! From Perldoc's <a href="http://perldoc.perl.org/perlfaq8.html#What%27s-the-difference-between-require-and-use%3F">What's the difference between require and use?</a>:</p>
 112
 113 <blockquote>
 114   <h2>What's the difference between require and use?</h2>
 115
 116   <p>Perl offers several different ways to include code from one file into another. Here are the deltas between the various inclusion constructs:</p>
 117
 118   <ol>
 119     <li> do $file is like eval `cat $file`, except the former</li>
 120       <ol>
 121         <li>searches @INC and updates %INC.</li>
 122
 123         <li>bequeaths an *unrelated* lexical scope on the eval'ed code.</li>
 124       </ol>
 125
 126     <li>require $file is like do $file, except the former</li>
 127       <ol>
 128         <li>checks for redundant loading, skipping already loaded files.</li>
 129
 130         <li>raises an exception on failure to find, compile, or execute $file.</li>
 131       </ol>
 132
 133     <li>require Module is like require "Module.pm", except the former</li>
 134       <ol>
 135         <li>translates each "::" into your system's directory separator.</li>
 136
 137         <li>primes the parser to disambiguate class Module as an indirect object.</li>
 138       </ol>
 139
 140     <li>use Module is like require Module, except the former</li>
 141       <ol>
 142         <li>loads the module at compile time, not run-time.</li>
 143
 144         <li>imports symbols and semantics from that package to the current one.</li>
 145       </ol>
 146   </ol>
 147 </blockquote>
 148
 149 <p>Note that becuase use loads the module at compile time one need to arrange for the @INC array to have any paths needed for use to succeed (IOW user written modules). In order to accomplish this one need to seed the @INC arrray in a BEGIN block as BEGIN blocks are executed before use is expanded,</p>
 150
 151 <h2>$/ Bug</h2>
 152
 153 <p>From Perldoc's <a href="http://perldoc.perl.org/perlvar.html">Perlvar</a>:</p>
 154
 155 <blockquote>
 156   <p>You should be very careful when modifying the default values of most special variables described in this document. In most cases you want to localize these variables before changing them, since if you don't, the change may affect other modules which rely on the default values of the special variables that you have changed. This is one of the correct ways to read the whole file at once:</p>
 157
 158   <div class="code"><pre>
 159   open my $fh, "foo" or die $!;
 160   local $/; # enable localized slurp mode
 161   my $content = <$fh>;
 162   close $fh;
 163   </pre></div>
 164
 165   <p>But the following code is quite bad:</p>
 166
 167   <div class="code"><pre>
 168   open my $fh, "foo" or die $!;
 169   undef $/; # enable slurp mode
 170   my $content = <$fh>;
 171   close $fh;
 172   </pre></div>
 173
 174   <p>since some other module, may want to read data from some file in the default "line mode", so if the code we have just presented has been executed, the global value of $/ is now changed for any other code running inside the same Perl interpreter.</p>
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