Arch::Changes(3pm)

NAME
Arch::Changes - class representing a list of changes

SYNOPSIS
    use Arch::Changes qw(:type);

    use Arch::Tree;
    my $changes = $tree->get_changes;
    print $changes->get_listing;

    use Arch::Log;
    my $changed = $log->get_changes->is_changed('to', "COPYING");
    die "License was compromised" if $changed && $changed->{&MODIFY};

DESCRIPTION
Arch::Changes contains a list of elements, each representing a single tree change. Each change element is described by a hash with the following fields:

type
    The type of the change. Can be one of ADD, DELETE, MODIFY, META_MODIFY or RENAME.

is_dir
    A boolean value indicating whether the affected tree element is a directory.

arguments
    A list of arguments. The first element is always relative path of the affected tree element. For changes of type RENAME the first argument is the old path and the second argument the new path name.

The type constants can be conveniently imported using the tag ":type".

    use Arch::Changes qw(:type);

METHODS
The following methods are available:

new, add, count, get, get_listing, is_changed, dump, type_string, to_string.

new Creates a new, initially empty, changes list.

    Typically it is called indirectly from method get_changes in Arch::Changeset, Arch::Tree or Arch::Log class.

add type is_dir arguments...
    Adds a new change element to the list of changes.

    Typically it is called indirectly from method get_changes in Arch::Changeset, Arch::Tree or Arch::Log class.

count
    Returns the number of change elements.

get num
    Returns the num-th change element or all if num is undefined.

get_listing
    Generates a textual changes listing as produced by "tla changes".

is_changed to filepath [is_dir]
    Verify whether the given filepath is modified by the changes. The to parameter may get boolean values "0", "1", "from" or "to", it only affects RENAME changes, and in some sense ADD and DELETE changes. If to is set, then the given filepath is taken as the destination of RENAME or ADD, otherwise as the source of RENAME or DELETE. The MODIFY and META_MODIFY changes are not affected, since the destination and the source is the same file/dir.

    If filepath is not modified by any changes, return undef.

    Otherwise, return hash with possible keys ADD, DELETE, MODIFY, META_MODIFY and RENAME. The hash values are 1 in all cases except for RENAME, then the value is the file name on the opposite side (i.e., the source of RENAME if to is true, and the destination if false).

    Note, the valid return values for arch are: undef, hashref with one key (ADD or DELETE) or hashref with combination of one-to-three keys (MODIFY, META_MODIFY and RENAME).

dump
    Generates a dump of the changes list using Data::Dumper.

type_string change
    Returns the change type string as produced by "tla changes".

to_string change
    Generates a changes line for change as produced by "tla changes".

BUGS
Awaiting for your reports.

AUTHORS
Mikhael Goikhman (migo@homemail.com--Perl-GPL/arch-perl--devel).

Enno Cramer (uebergeek@web.de--2003/arch-perl--devel).

SEE ALSO
For more information, see tla, Arch::Changeset, Arch::Tree, Arch::Log.