defaria.com/blogs/Status/2007/09/ucmwb-123-relea.html

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  70                   <h2 itemprop="name" class="asset-name entry-title">ucmwb 1.2.3 release/Perl'isms</h2>
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  73                       <li class="asset-meta-list-item">Posted on <time datetime="2007-09-14T12:51:03-08:00" itemprop="datePublished">September 14, 2007</time></li>
  74                       <li class="asset-meta-list-item">by <span class="author entry-author vcard"></span></li>
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  77                       <li class="asset-meta-list-item">in <a itemprop="articleSection" rel="tag" href="http://defaria.com/blogs/Status/general-dynamics/">General Dynamics</a></li>
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  84                   <ul>
  85   <li>Released ucmwb 1.2.3</li>
  86 </ul>
  87                   <h3>FindBin, Getopt::Long and Display.pm</h3>
  88
  89 <p>Here's how I typically use <a
  90  href="http://search.cpan.org/%7Enwclark/perl-5.8.8/lib/FindBin.pm">FindBin</a>:</p>
  91
  92 <div class=code><pre>
  93 use FindBin;
  94 ...
  95 use lib "$FindBin::Bin/../lib";
  96 ...
  97 sub Usage ($) {
  98   my ($msg) = @_;
  99
 100   display "ERROR: $msg\n" if defined $msg;
 101   display &lt;&lt;END;
 102 Usage: $FindBin::Script [-usage] [-verbose] [-debug] [-exec]
 103                 -from_view &lt;view&gt; -label &lt;label_name&gt;
 104 ...
 105 END
 106 </pre></div>
 107
 108 <p>Also I tend to use Getopt::Long. It is extremely flexible. Options can be specified in the GNU long method as in --debug or just -debug. Additionally you can abbreviate as in -d IFF there is no other option that starts with "d". Options can have parameters (-file myfile.txt or -file=myfile.txt), set boolean (-verbose can set say $verbose), automatic negation (-verbose or -noverbose), even call subroutines directly!k Here's an example.</p>
 109
 110 <div class=code><pre>
 111 use GetOpt::Long;
 112 ...
 113 my $execute     = 0;
 114 my $from_view;  # e.g. p6258c_RAN_FDD_Doc_Bld1_int
 115 my $branch;     # e.g. ran_fdd_release_build2_integration
 116 my $label;      # e.g. RAN_FDD_RELEASE_BUILD1
 117
 118 GetOptions (
 119   "usage"       =&gt; sub { Usage "" },
 120   "verbose"     =&gt; sub { set_verbose },
 121   "debug"       =&gt; sub { set_debug },
 122   "exec!"       =&gt; \$execute,
 123   "from_view=s" =&gt; \$from_view,
 124   "branch=s"    =&gt; \$branch,
 125   "label=s"     =&gt; \$label,
 126 ) || Usage "Unknown parameter";
 127 </pre></div>
 128
 129 <p>Some notes about the above:</p>
 130
 131 <ul>
 132   <li>Usage is a subroutine (most people have one) that takes one parameter for an extra message to display first.</li>
 133
 134   <li>Eat your own dog food! I use my <a href="http://clearscm.com/php/cvs_man.php?file=lib/Display.pm">Display</a> module which has display routines for verbose and debug, etc. It also has $verbose and $debug variables and exports the set_verbose and set_debug methods.</li>
 135
 136   <li>The "exec!" is a negation. So -exec and -noexec apply and set $execute accordingly</li>
 137
 138   <li>All of "from_view", "branch" and "label" are simple name/value type parameters so -branch &lt;branchname&gt; sets $branch to &lt;branchname&gt;.</li>
 139 </ul>
 140
 141 <p>A word on Display.pm:</p>
 142
 143 <p>I find that often people do the following:</p>
 144
 145
 146 <div class=code><pre>
 147 print "In myspecial_subroutine: File = $file\n" if $debug;
 148 </pre></div>
 149
 150 <p>for debugging. To me it's always been a hassle to have to remember to include the "\b" and the "if $debug", etc. Granted that's not a lot. But how can I make it better?</p>
 151
 152 <p>My thought was to name the procedure debug and include the "\n" by default. People oughta quickly discern that:</p>
 153
 154 <div class=code><pre>
 155 debug "In myspecial_subroutine: File = $file";
 156 </pre></div>
 157
 158 <p>probably only happens when debugging.</p>
 159
 160 <p>Additionally I support routines like verbose, debug, error, warning
 161 (from Display.pm).</p>
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