flipdiff
exchange the order of two incremental patches
Synopsis
flipdiff
[[-p n] |
[--strip-match=n]]
[[-U n] |
[--unified=n]]
[[-d PAT] |
[--drop-context=PAT]] [[-q] |
[--quiet]] [[-z] |
[--decompress]] [[-b] |
[--ignore-space-change]] [[-B]
| [--ignore-blank-lines]]
[[-i] | [--ignore-case]] [[-w]
| [--ignore-all-space]]
[--in-place] diff1 diff2
flipdiff
{[--help] | [--version]}
add an example, a script, a trick and tips
examples
source
eval "patch1=\${$i}"
flipdiff $patch1 $patch2 >/dev/null ||
exit $?
i=$(($i -
1))
done
# Do it for real.
# Do it for real.
i=$(($# -
1))
while [
$i -gt 0 ]
do
eval "patch1=\${$i}"
(set -x;
flipdiff --in-place $patch1
$patch2)
|| exit
$?
i=$(($i -
1))
done
description
flipdiff
exchanges the order of two patch files that apply one after
the other. The patches must be “clean”: the
context lines must match and there should be no
mis-matched offsets.
The swapped
patches are sent to standard output, with a marker line
(“=== 8< === cut here === 8< ===”)
between them, unless the --in-place
option is passed. In that case, the output is written back
to the original input files.
options
-p
n,
--strip-match=n
When comparing filenames,
ignore the first n pathname components from both
patches. (This is similar to the -p option to
GNU patch(1).)
-q,
--quiet
Quieter output. Don't emit
rationale lines at the beginning of each patch.
-U
n, --unified=n
Attempt to display n
lines of context (requires at least n lines of
context in both input files). (This is similar to the
-U option to GNU diff(1).)
-d
pattern,
--drop-context=PATTERN
Don't display any context on
files that match the shell wildcard pattern. This
option can be given multiple times.
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 fnmatch). This is so that
“*/basename”-type patterns can be given
without limiting the number of pathname components.
-i,
--ignore-case
Consider upper- and
lower-case to be the same.
-w,
--ignore-all-space
Ignore whitespace changes in
patches.
-b,
--ignore-space-change
Ignore changes in the amount of
whitespace.
-B,
--ignore-blank-lines
Ignore changes whose lines are
all blank.
-z,
--decompress
Decompress files with
extensions .gz and .bz2.
--in-place
Write output to the original
input files.
--help
Display a short usage
message.
--version
Display the version number of
flipdiff.
limitations
This is only been very lightly tested, and may not even work.
Using --in-place is not recommended at the moment.
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.
Because of this, it is generally a good idea to read through the
output to check that it makes sense.
author
Tim
Waugh <twaugh[:at:]redhat[:dot:]com>
Package maintainer