'\" t
.\"     Title: flipdiff
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 23 January 2009
.\"    Manual: Man pages
.\"    Source: patchutils
.\"  Language: English
.\"
.TH "FLIPDIFF" "1" "23 January 2009" "patchutils" "Man pages"
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.SH "NAME"
flipdiff \- exchange the order of two incremental patches
.SH "SYNOPSIS"
.HP \w'\fBflipdiff\fR\ 'u
\fBflipdiff\fR [[\-p\ \fIn\fR] | [\-\-strip\-match=\fIn\fR]] [[\-U\ \fIn\fR] | [\-\-unified=\fIn\fR]] [[\-d\ \fIPAT\fR] | [\-\-drop\-context=\fIPAT\fR]] [[\-q] | [\-\-quiet]] [[\-z] | [\-\-decompress]] [[\-b] | [\-\-ignore\-space\-change]] [[\-B] | [\-\-ignore\-blank\-lines]] [[\-i] | [\-\-ignore\-case]] [[\-w] | [\-\-ignore\-all\-space]] [\-\-in\-place] \fIdiff1\fR \fIdiff2\fR
.HP \w'\fBflipdiff\fR\ 'u
\fBflipdiff\fR {[\-\-help] | [\-\-version]}
.SH "DESCRIPTION"
.PP
\fBflipdiff\fR
exchanges the order of two patch files that apply one after the other\&. The patches must be
\(lqclean\(rq: the context lines must match and there should be no mis\-matched offsets\&.
.PP
The swapped patches are sent to standard output, with a marker line (\(lq===\ \&8<\ \&===\ \&cut\ \&here\ \&===\ \&8<\ \&===\(rq) between them, unless the
\fB\-\-in\-place\fR
option is passed\&. In that case, the output is written back to the original input files\&.
.SH "OPTIONS"
.PP
\fB\-p\fR \fIn\fR, \fB\-\-strip\-match=\fR\fB\fIn\fR\fR
.RS 4
When comparing filenames, ignore the first
\fIn\fR
pathname components from both patches\&. (This is similar to the
\fB\-p\fR
option to GNU
\fBpatch\fR(1)\&.)
.RE
.PP
\fB\-q\fR, \fB\-\-quiet\fR
.RS 4
Quieter output\&. Don\*(Aqt emit rationale lines at the beginning of each patch\&.
.RE
.PP
\fB\-U\fR \fIn\fR, \fB\-\-unified=\fR\fB\fIn\fR\fR
.RS 4
Attempt to display
\fIn\fR
lines of context (requires at least
\fIn\fR
lines of context in both input files)\&. (This is similar to the
\fB\-U\fR
option to GNU
\fBdiff\fR(1)\&.)
.RE
.PP
\fB\-d\fR \fIpattern\fR, \fB\-\-drop\-context=\fR\fB\fIPATTERN\fR\fR
.RS 4
Don\*(Aqt display any context on files that match the shell wildcard
\fIpattern\fR\&. This option can be given multiple times\&.
.sp
Note that the interpretation of the shell wildcard pattern does not count slash characters or periods as special (in other words, no flags are given to
\fBfnmatch\fR)\&. This is so that
\(lq*/basename\(rq\-type patterns can be given without limiting the number of pathname components\&.
.RE
.PP
\fB\-i\fR, \fB\-\-ignore\-case\fR
.RS 4
Consider upper\- and lower\-case to be the same\&.
.RE
.PP
\fB\-w\fR, \fB\-\-ignore\-all\-space\fR
.RS 4
Ignore whitespace changes in patches\&.
.RE
.PP
\fB\-b\fR, \fB\-\-ignore\-space\-change\fR
.RS 4
Ignore changes in the amount of whitespace\&.
.RE
.PP
\fB\-B\fR, \fB\-\-ignore\-blank\-lines\fR
.RS 4
Ignore changes whose lines are all blank\&.
.RE
.PP
\fB\-z\fR, \fB\-\-decompress\fR
.RS 4
Decompress files with extensions \&.gz and \&.bz2\&.
.RE
.PP
\fB\-\-in\-place\fR
.RS 4
Write output to the original input files\&.
.RE
.PP
\fB\-\-help\fR
.RS 4
Display a short usage message\&.
.RE
.PP
\fB\-\-version\fR
.RS 4
Display the version number of flipdiff\&.
.RE
.SH "LIMITATIONS"
.PP
This is only been very lightly tested, and may not even work\&. Using
\fB\-\-in\-place\fR
is not recommended at the moment\&.
.PP
There are some cases in which it is not possible to meaningfully flip patches without understanding the semantics of the content\&. This program only uses complete lines that appear at some stage during the application of the two patches, and never composes a line from parts\&.
.PP
Because of this, it is generally a good idea to read through the output to check that it makes sense\&.
.SH "AUTHOR"
.PP
\fBTim Waugh\fR <\&twaugh@redhat.com\&>
.RS 4
Package maintainer
.RE