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This commit implements the rename detection algorithms used in the
JGit implementation.
Given a list of changes, additions and deletions are extracted and
matched in two ways:
- By exact hash content: all additions and deletions are grouped by
the content hash and paired with the best match based on the file
mode and file path. All the files that cannot be paired are kept
as regular deletions and additions.
- By similar content: a matrix of addition and deletion pairs with
all possible combinations is created and scored by how similar the
content is between both files as well as how similar the file path
is. The pairs with the best score and whose score is equal or
greater than a threshold are paired and turned into a rename.
All the files that cannot be paired are kept as regular deletions
and additions.
DiffTree and DiffTreeContext will not return the changes with renames
detected for compatibility reasons, although this will change in v6
so that detecting renames is the default behaviour.
A new function DiffTreeWithOptions has been added to configure the
parameters for the rename detection to control the score threshold,
the limit of renames and whether to use similar content detection in
the detection.
More information:
- https://github.com/eclipse/jgit/blob/master/org.eclipse.jgit/src/org/eclipse/jgit/diff/RenameDetector.java
- https://github.com/eclipse/jgit/blob/master/org.eclipse.jgit/src/org/eclipse/jgit/diff/SimilarityRenameDetector.java
- https://github.com/eclipse/jgit/blob/master/org.eclipse.jgit/src/org/eclipse/jgit/diff/SimilarityIndex.java
Signed-off-by: Miguel Molina <miguel@erizocosmi.co>
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Signed-off-by: Oleksandr Redko <oleksandr.red+github@gmail.com>
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Signed-off-by: Marc Barussaud <marc.barussaud@orange.com>
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To be able to fix #261 we will move again to gopkg.in before v4 stable release.
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Fix #275 .
It was not possible to write a test for this issue as the original fsnoder didn't support filenames with length > 1. Therefore this patch has 3 commits:
add support for long filenames in fsnoder.
add a test case for the issue using the new long filenames from step 1.
fix the issue by comparing paths level by level instead of lexigographically over the whole path.
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difftree for noders
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