perltidy does

confess
    "Insufficent data in X from {hash lookup} through {hash lookup} so
+urce data file {hash lookup}"
    unless $condition;
[download]

which seems reasonable, although these days I prefer "condition or" to "unless"

$condition
  or confess
"Insufficent data in X from {hash lookup} through {hash lookup} source
+ data file {hash lookup}";
[download]

I've tried my hand at concatenation

$condition
    or confess "Insufficent data in X from {hash lookup} "
    . "through {hash lookup} source data file {hash lookup}";
[download]

And I it is pleasing to the eye, but I wouldn't do that by hand typing (editor IDE should handle it automagically). This also makes searching source code slightly more keyboard clicks but its not a deal breaker for me.

I also like

$condition
  or confessn "Insufficent data in X from {hash lookup}
through {hash lookup} source data file {hash lookup}";
[download]

where confessn would do some newline squashing

But mostly I just let it go past 80 chars cause is the least hassle and works with all editors :)

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