NAME
    File::Patch::Undoable - Patch a file, with undo support

VERSION
    This document describes version 0.04 of File::Patch::Undoable (from Perl
    distribution File-Patch-Undoable), released on 2014-05-28.

FUNCTIONS
  patch(%args) -> [status, msg, result, meta]
    Patch a file, with undo support.

    On do, will patch file with the supplied patch. On undo, will apply the
    reverse of the patch.

    Note: Symlink is currently not permitted (except for the patch file).
    Patching is currently done with the "patch" program.

    Unfixable state: file does not exist or not a regular file (directory
    and symlink included), patch file does not exist or not a regular file
    (but symlink allowed).

    Fixed state: file exists, patch file exists, and patch has been applied.

    Fixable state: file exists, patch file exists, and patch has not been
    applied.

    This function is idempotent (repeated invocations with same arguments
    has the same effect as single invocation). This function supports
    transactions.

    Arguments ('*' denotes required arguments):

    *   file* => *str*

        Path to file to be patched.

    *   patch* => *str*

        Path to patch file.

        Patch can be in unified or context format, it will be autodetected.

    *   reverse => *bool* (default: 0)

        Whether to apply reverse of patch.

    Special arguments:

    *   -tx_action => *str*

        For more information on transaction, see Rinci::Transaction.

    *   -tx_action_id => *str*

        For more information on transaction, see Rinci::Transaction.

    *   -tx_recovery => *str*

        For more information on transaction, see Rinci::Transaction.

    *   -tx_rollback => *str*

        For more information on transaction, see Rinci::Transaction.

    *   -tx_v => *str*

        For more information on transaction, see Rinci::Transaction.

    Return value:

    Returns an enveloped result (an array).

    First element (status) is an integer containing HTTP status code (200
    means OK, 4xx caller error, 5xx function error). Second element (msg) is
    a string containing error message, or 'OK' if status is 200. Third
    element (result) is optional, the actual result. Fourth element (meta)
    is called result metadata and is optional, a hash that contains extra
    information.

FAQ
  Why use the patch program? Why not use a Perl module like Text::Patch?
    The patch program has many nice features that Text::Patch lacks, e.g.
    applying reverse patch (needed to check fixed state and to undo),
    autodetection of patch type, ignoring whitespace and fuzz factor, etc.

KNOWN ISSUES
SEE ALSO
    Rinci::Transaction

    Text::Patch, PatchReader, Text::Patch::Rred

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/File-Patch-Undoable>.

SOURCE
    Source repository is at
    <https://github.com/sharyanto/perl-File-Patch-Undoable>.

BUGS
    Please report any bugs or feature requests on the bugtracker website
    <https://rt.cpan.org/Public/Dist/Display.html?Name=File-Patch-Undoable>

    When submitting a bug or request, please include a test-file or a patch
    to an existing test-file that illustrates the bug or desired feature.

AUTHOR
    Steven Haryanto <stevenharyanto@gmail.com>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2014 by Steven Haryanto.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.