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427dcb4bca
This introduces the diff-core, the layer between the diff-tree family and the external diff interface engine. The calls to the interface diff-tree family uses (diff_change and diff_addremove) have not changed and will not change. The purpose of the diff-core layer is to provide an infrastructure to transform the set of differences sent from the applications, before sending them to the external diff interface. The recently introduced rename detection code has been rewritten to use the diff-core facility. When applications send in separate creates and deletes, matching ones are transformed into a single rename-and-edit diff, and sent out to the external diff interface as such. This patch also enhances the rename detection code further to be able to detect copies. Currently this happens only as long as copy sources appear as part of the modified files, but there already is enough provision for callers to report unmodified files to diff-core, so that they can be also used as copy source candidates. Extending the callers this way will be done in a separate patch. Please see and marvel at how well this works by trying out the newly added t/t4003-diff-rename-1.sh test script. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
67 lines
1.0 KiB
Bash
Executable File
67 lines
1.0 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2005 Junio C Hamano
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#
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test_description='Test rename detection in diff engine.
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'
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. ./test-lib.sh
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echo >path0 'Line 1
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Line 2
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Line 3
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Line 4
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Line 5
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Line 6
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Line 7
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Line 8
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Line 9
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Line 10
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line 11
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Line 12
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Line 13
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Line 14
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Line 15
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'
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test_expect_success \
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'update-cache --add a file.' \
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'git-update-cache --add path0'
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test_expect_success \
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'write that tree.' \
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'tree=$(git-write-tree) && echo $tree'
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sed -e 's/line/Line/' <path0 >path1
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rm -f path0
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test_expect_success \
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'renamed and edited the file.' \
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'git-update-cache --add --remove path0 path1'
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test_expect_success \
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'git-diff-cache -p -M after rename and editing.' \
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'git-diff-cache -p -M $tree >current'
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cat >expected <<\EOF
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diff --git a/path0 b/path1
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rename old path0
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rename new path1
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--- a/path0
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+++ b/path1
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@@ -8,7 +8,7 @@ Line 7
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Line 8
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Line 9
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Line 10
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-line 11
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+Line 11
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Line 12
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Line 13
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Line 14
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EOF
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test_expect_success \
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'validate the output.' \
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'diff -I "similarity.*" >/dev/null current expected'
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test_done
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