Julian Foad created SVN-4808:
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Summary: Diff prints headers without diffs, using external diff-cmd
Key: SVN-4808
URL: https://issues.apache.org/jira/browse/SVN-4808
Project: Subversion
Issue Type: Bug
Reporter: Julian Foad
_(I'm filing this from memory, with no reproduction recipe at hand. Details
could be wrong. Could even have been fixed, but I'm not aware it has.)_
svn diff can print diff headers without diffs, when an external diff-cmd is
configured, in certain cases:
{code:java}
Index: abc
===================={code}
It never shows this kind of output when using the internal diff.
What happens, roughly, is that if the low level diffing algorithm spits out
anything through its "text changed" API, then the high level first prints this
"Index:" header and then calls the configured external diff tool. In some cases
the "text changed" API call can spit out a no-op, and in other cases it can
spit out a real text change that consists only of changes that the external
diff tool ignores, such as EOL-style changes. In either of those cases, you can
get this result.
When this happens, it's often for a whole lot of files, e.g. all the files on a
branch-creation diff, which makes it annoying.
_(Need a_ _reproduction recipe_ _or test case.)_
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