tag(3tcl)                                                                                                                                tag(3tcl)

NAME

       tag - Manipulate tagged files

SYNOPSIS

       tag option ?arg arg ...?

DESCRIPTION

       The tag procedure provides a number of options for manipulating tagged files.

COMMANDS

       tag readfile filename

              Reads the file with the given filename and returns a list where each list element is a tag record, which is represented by a list of
              label-value pairs, or label-value-endlabel triples.

              The tag header is the first element returned.

       tag writefile filename list

              Takes a list in the format used internally in tcl programs for tagged data and writes it as a tagged file.

       tag extract list tests

              Takes a list in tagged format, and a list of conditions, and returns a new list in tagged format which contains  those  tag  records
              which match the conditions.

              The tests is a list of test items, each of which is a list of the form { labelname condition matchvalue }

              The conditions are

       ==     String equals

       !=     String not equal

       <=     Less than or equal

       -in    Is the test value a member of the list given as the matchvalue

       -contains
              Does the match value contain the test value as a case insensitive substring.

       -earlier
              Date earlier

       -later Date later - dates are in ISO format (yyyy-mm-dd [hh:mm:ss]).

       -exists
              Does the label exist in this record.

BUGS

       tag readfile reads the whole file into memory before turning it into a list.  Should be more memory efficient.

       The -earlier and -later comparisons require TCL8.3

AUTHOR

       John Lines (john@paladin.demon.co.uk)

                                                                   July 3, 2000                                                          tag(3tcl)