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flipdiff - Online in the Cloud

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This is the command flipdiff that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



flipdiff - exchange the order of two incremental patches


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]}


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

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.


-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.

Write output to the original input files.

Display a short usage message.

Display the version number of flipdiff.


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.

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