I usually use this config for perltidy that mirrors (mostly) the recommendations from Perl Best Practices (and it uses 4 spaces). 

## PBP perltidy RC file
-l=78   # Max line width is 78 cols
-i=4    # Indent level is 4 cols
-ci=4   # Continuation indent is 4 cols
-st     # Output to STDOUT
-se     # Errors to STDERR
-ce     # cucddled elsen (XXX my pref)
-vt=2   # Maximal vertical tightness
-cti=0  # No extra indentation for closing brackets
-pt=1   # Medium parenthesis tightness
-bt=1   # Medium brace tightness
-sbt=1  # Medium square bracket tightness
-bbt=1  # Medium block brace tightness
-nsfs   # No space before semicolons
-nolq   # Don't outdent long quoted strings
-wbb="% + - * / x != == >= <= =~ !~ < > | & >= < = **= += *= &= <<= &&
+= -= /= |= >>= ||= .= %= ^= x="
        # Break before all operators

[download]

At first glance nothing about your sample file there looks particularly egregious (although your usage of prototypes is maybe a bit suspect; in most cases unless you're trying to affect how perl parses things in a weird way you don't want to use them (that being said the new signatures are a slightly different story)).

Edit: Also after another closer read looking at what the code's doing rather than formatting it looks like you may be reimplementing an existing wheel (see e.g. Data::Diver).

The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re: Code style question by Fletch
in thread Code style question by AlexP

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.