Dpkg::Control::Fields(3)					   libdpkg-perl 					  Dpkg::Control::Fields(3)

NAME

       Dpkg::Control::Fields - manage (list of official) control fields

DESCRIPTION

       The modules contains a list of fieldnames with associated meta-data explaining in which type of control information they are allowed. The
       types are the CTRL_* constants exported by Dpkg::Control.

FUNCTIONS

       my $f = field_capitalize($field_name)
	   Returns the field name properly capitalized. All characters are lowercase, except the first of each word (words are separated by a dash
	   in field names).

       field_is_official($fname)
	   Returns true if the field is official and known.

       field_is_allowed_in($fname, @types)
	   Returns true (1) if the field $fname is allowed in all the types listed in the list. Note that you can use type sets instead of
	   individual types (ex: CTRL_FILE_CHANGES | CTRL_CHANGELOG).

	   field_allowed_in(A|B, C) returns true only if the field is allowed in C and either A or B.

	   Undef is returned for non-official fields.

       field_transfer_single($from, $to, $field)
	   If appropriate, copy the value of the field named $field taken from the $from Dpkg::Control object to the $to Dpkg::Control object.

	   Official fields are copied only if the field is allowed in both types of objects. Custom fields are treated in a specific manner. When
	   the target is not among CTRL_PKG_SRC, CTRL_PKG_DEB or CTRL_FILE_CHANGES, then they are alway copied as is (the X- prefix is kept).
	   Otherwise they are not copied except if the target object matches the target destination encoded in the field name. The initial X
	   denoting custom fields can be followed by one or more letters among "S" (Source: corresponds to CTRL_PKG_SRC), "B" (Binary: corresponds
	   to CTRL_PKG_DEB) or "C" (Changes: corresponds to CTRL_FILE_CHANGES).

	   Returns undef if nothing has been copied or the name of the new field added to $to otherwise.

       field_transfer_all($from, $to)
	   Transfer all appropriate fields from $from to $to. Calls field_transfer_single() on all fields available in $from.

	   Returns the list of fields that have been added to $to.

       field_ordered_list($type)
	   Returns an ordered list of fields for a given type of control information.  This list can be used to output the fields in a predictable
	   order.  The list might be empty for types where the order does not matter much.

       field_list_src_dep()
	   List of fields that contains dependencies-like information in a source Debian package.

       field_list_pkg_dep()
	   List of fields that contains dependencies-like information in a binary Debian package. The fields that express real dependencies are
	   sorted from the stronger to the weaker.

       field_get_dep_type($field)
	   Return the type of the dependency expressed by the given field. Can either be "normal" for a real dependency field (Pre-Depends,
	   Depends, ...)  or "union" for other relation fields sharing the same syntax (Conflicts, Breaks, ...). Returns undef for fields which
	   are not dependencies.

       field_register($field, $allowed_types, %opts)
	   Register a new field as being allowed in control information of specified types. %opts is optional

       field_insert_after($type, $ref, @fields)
	   Place field after another one ($ref) in output of control information of type $type.

       field_insert_before($type, $ref, @fields)
	   Place field before another one ($ref) in output of control information of type $type.

AUTHOR

       Raphael Hertzog <hertzog@debian.org>.

1.16.15 							    2014-06-05						  Dpkg::Control::Fields(3)