=head1 NAME

recs-assert

=head1 recs-assert --help-all

 Help from: --help-basic:
 Usage: recs-assert <args> <expr> [<files>]
    Asserts that every record in the stream must pass the given <expr>.
 
    <expr> is evaluated as Perl on each record of input (or records from <files>)
    with $r set to a App::RecordStream::Record object and $line set to the
    current line number (starting at 1). If <expr> does not evaluate to true,
    processing is immediately aborted and an error message printed. See --help-
    snippets for more information on code snippets.
 
    --diagnostic|-d <text>       Include the diagnostic string <text> in any
                                 failed assertion errors
    --verbose|-v                 Verbose output for failed assertions; dumps the
                                 current record
    --e                          a perl snippet to execute, optional
    --E                          the name of a file to read as a perl snippet
    --M module[=...]             execute "use module..." before executing
                                 snippet; same behaviour as perl -M
    --m module[=...]             same as -M, but by default import nothing
    --filename-key|fk <keyspec>  Add a key with the source filename (if no
                                 filename is applicable will put NONE)
 
   Help Options:
       --help-all      Output all help for this script
       --help          This help screen
       --help-snippet  Help on code snippets
 
 Examples:
    Require each record to have a "date" field.
       recs-assert '$r->{date}'
 
 Help from: --help-snippet:
    CODE SNIPPETS:
     Recs code snippets are perl code, with one exception. There a couple of
     variables predefined for you, and one piece of special syntax to assist in
     modifying hashes.
 
 Special Variables:
     $r - the current record object. This may be used exactly like a hash, or you
     can use some of the special record functions, see App::RecordStream::Record
     for more information
 
     $line - This is the number of records run through the code snippet, starting
     at 1. For most scripts this corresponds to the line number of the input to
     the script.
 
     $filename - The filename of the originating record. Note: This is only
     useful if you're passing filenames directly to the recs script, piping
     from other recs scripts or from cat, for instance, will not have a
     useful filename.
 
 Special Syntax
     Use {{search_string}} to look for a string in the keys of a record, use /
     to nest keys. You can nest into arrays by using an index. If you are
     vivifying arrays (if the array doesn't exist, prefix your key with # so
     that an array rather than a hash will be created to put a / in your key,
     escape it twice, i.e. \/
 
     This is exactly the same as a key spec that is always prefaced with a @, see
     'man recs' for more info on key specs
 
     For example: A record that looks like:
     { "foo" : { "bar 1" : 1 }, "zoo" : 2}
     Could be accessed like this:
 
     # value of zoo  # value of $r->{foo}->{bar 1}: (comma separate nested keys)
     {{zoo}}         {{foo/ar 1}}
 
     # Even assign to values (set the foo key to the value 1)
     {{foo}} = 1
 
     # And auto, vivify
     {{new_key/array_key/#0}} = 3 # creates an array within a hash within a hash
 
     # Index into an array
     {{array_key/#3}} # The value of index 3 of the array ref under the
     'array_key' hash key.
 
     This matching is a fuzzy keyspec matching, see --help-keyspecs for
     more details.
 

=head1 SEE ALSO

=over

=item * See L<App::RecordStream> for an overview of the scripts and the system

=item * Run C<recs examples> or see L<App::RecordStream::Manual::Examples> for a set of simple recs examples

=item * Run C<recs story> or see L<App::RecordStream::Manual::Story> for a humorous introduction to RecordStream

=item * Every command has a C<--help> mode available to print out usage and
examples for the particular command, just like the output above.

=back

