Data::Printer::Filter::Digest - pretty-printing MD5, SHA and many other digests
In your .dataprinter file:
filters = Digest
You may also setup the look and feel with the following options:
filter_digest.show_class_name = 0
filter_digest.show_reset = 1
# you can even customize your themes:
colors.digest = #27ac3c
This is a filter plugin for Data::Printer. It filters through several message digest objects and displays their current value in hexadecimal format as a string.
Any module that inherits from Digest::base. The following ones are actively supported:
If you have any suggestions for more modules or better output, please let us know.
Aside from the display color, there are a few other options to be customized via the filter_digest option key:
If set to true (the default) the class name will be displayed right next to the hexadecimal digest.
If set to true (the default), the filter will add a [reset] tag after dumping an empty digest object. See the rationale below.
The digest operation is effectively a destructive, read-once operation. Once it has been performed, most Digest::* objects are automatically reset and can be used to calculate another digest value.
This behaviour - or, rather, forgetting about this behaviour - is a common source of issues when working with Digests.
This Data::Printer filter will not destroy your object. Instead, we work on a cloned version to display the hexdigest, leaving your original object untouched.
As another debugging convenience for developers, since the empty object will produce a digest even after being used, this filter adds by default a [reset] tag to indicate that the object is empty, in a 'reset' state - i.e. its hexdigest is the same as the hexdigest of a new, empty object of that same class.
To install Data::Printer, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.