git/t/t4001-diff-rename.sh

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#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano
#
test_description='Test rename detection in diff engine.
'
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-diff.sh
test_expect_success 'setup' '
cat >path0 <<-\EOF &&
Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 9
Line 10
line 11
Line 12
Line 13
Line 14
Line 15
EOF
cat >expected <<-\EOF &&
diff --git a/path0 b/path1
rename from path0
rename to path1
--- a/path0
+++ b/path1
@@ -8,7 +8,7 @@ Line 7
Line 8
Line 9
Line 10
-line 11
+Line 11
Line 12
Line 13
Line 14
EOF
cat >no-rename <<-\EOF
diff --git a/path0 b/path0
deleted file mode 100644
index fdbec44..0000000
--- a/path0
+++ /dev/null
@@ -1,15 +0,0 @@
-Line 1
-Line 2
-Line 3
-Line 4
-Line 5
-Line 6
-Line 7
-Line 8
-Line 9
-Line 10
-line 11
-Line 12
-Line 13
-Line 14
-Line 15
diff --git a/path1 b/path1
new file mode 100644
index 0000000..752c50e
--- /dev/null
+++ b/path1
@@ -0,0 +1,15 @@
+Line 1
+Line 2
+Line 3
+Line 4
+Line 5
+Line 6
+Line 7
+Line 8
+Line 9
+Line 10
+Line 11
+Line 12
+Line 13
+Line 14
+Line 15
EOF
'
test_expect_success \
'update-index --add a file.' \
'git update-index --add path0'
test_expect_success \
'write that tree.' \
'tree=$(git write-tree) && echo $tree'
sed -e 's/line/Line/' <path0 >path1
rm -f path0
test_expect_success \
'renamed and edited the file.' \
'git update-index --add --remove path0 path1'
test_expect_success \
'git diff-index -p -M after rename and editing.' \
'git diff-index -p -M $tree >current'
test_expect_success \
'validate the output.' \
'compare_diff_patch current expected'
test_expect_success 'test diff.renames=true' '
git -c diff.renames=true diff --cached $tree >current &&
compare_diff_patch current expected
'
test_expect_success 'test diff.renames=false' '
git -c diff.renames=false diff --cached $tree >current &&
compare_diff_patch current no-rename
'
test_expect_success 'test diff.renames unset' '
git diff --cached $tree >current &&
compare_diff_patch current expected
'
test_expect_success 'favour same basenames over different ones' '
cp path1 another-path &&
git add another-path &&
git commit -m 1 &&
git rm path1 &&
mkdir subdir &&
git mv another-path subdir/path1 &&
git status >out &&
test_i18ngrep "renamed: .*path1 -> subdir/path1" out
'
wt-status: use settings from git_diff_ui_config If you do something like - git add . - git status - git commit - git show (or git diff HEAD) one would expect to have analogous output from git status and git show (or similar diff-related programs). This is generally not the case, as git status has hard coded values for diff related options. With this commit the hard coded settings are dropped from the status command in favour for values provided by git_diff_ui_config. What follows are some remarks on the concrete options which were hard coded in git status: diffopt.detect_rename Since the very beginning of git status in a3e870f2e2 ("Add "commit" helper script", 2005-05-30), git status always used rename detection, whereas with commands like show and log one had to activate it with a command line option. After 5404c116aa ("diff: activate diff.renames by default", 2016-02-25) the default behaves the same by coincidence, but changing diff.renames to other values can break the consistency between git status and other commands again. With this commit one control the same default behaviour with diff.renames. diffopt.rename_limit Similarly one has the option diff.renamelimit to adjust this limit for all commands but git status. With this commit git status will also honor those. diffopt.break_opt Unlike the other two options this cannot be configured by a configuration option yet. This commit will also change the default behaviour to not use break rewrites. But as rename detection is most likely on, this is dangerous to be activated anyway as one can see here: https://public-inbox.org/git/xmqqegqaahnh.fsf@gitster.dls.corp.google.com/ Signed-off-by: Eckhard S. Maaß <eckhard.s.maass@gmail.com> Reviewed-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-04 11:12:15 +00:00
test_expect_success 'test diff.renames=true for git status' '
git -c diff.renames=true status >out &&
test_i18ngrep "renamed: .*path1 -> subdir/path1" out
'
test_expect_success 'test diff.renames=false for git status' '
git -c diff.renames=false status >out &&
test_i18ngrep ! "renamed: .*path1 -> subdir/path1" out &&
test_i18ngrep "new file: .*subdir/path1" out &&
test_i18ngrep "deleted: .*[^/]path1" out
'
test_expect_success 'favour same basenames even with minor differences' '
git show HEAD:path1 | sed "s/15/16/" > subdir/path1 &&
git status >out &&
test_i18ngrep "renamed: .*path1 -> subdir/path1" out
'
2016-03-30 08:35:07 +00:00
test_expect_success 'two files with same basename and same content' '
git reset --hard &&
mkdir -p dir/A dir/B &&
cp path1 dir/A/file &&
cp path1 dir/B/file &&
git add dir &&
git commit -m 2 &&
git mv dir other-dir &&
git status >out &&
test_i18ngrep "renamed: .*dir/A/file -> other-dir/A/file" out
2016-03-30 08:35:07 +00:00
'
test_expect_success 'setup for many rename source candidates' '
git reset --hard &&
for i in 0 1 2 3 4 5 6 7 8 9;
do
for j in 0 1 2 3 4 5 6 7 8 9;
do
echo "$i$j" >"path$i$j" || return 1
done
done &&
git add "path??" &&
test_tick &&
git commit -m "hundred" &&
(cat path1 && echo new) >new-path &&
echo old >>path1 &&
git add new-path path1 &&
git diff -l 4 -C -C --cached --name-status >actual 2>actual.err &&
sed -e "s/^\([CM]\)[0-9]* /\1 /" actual >actual.munged &&
cat >expect <<-EOF &&
C path1 new-path
M path1
EOF
test_cmp expect actual.munged &&
grep warning actual.err
'
test_expect_success 'rename pretty print with nothing in common' '
mkdir -p a/b/ &&
: >a/b/c &&
git add a/b/c &&
git commit -m "create a/b/c" &&
mkdir -p c/b/ &&
git mv a/b/c c/b/a &&
git commit -m "a/b/c -> c/b/a" &&
git diff -M --summary HEAD^ HEAD >output &&
test_i18ngrep " a/b/c => c/b/a " output &&
git diff -M --stat HEAD^ HEAD >output &&
test_i18ngrep " a/b/c => c/b/a " output
'
test_expect_success 'rename pretty print with common prefix' '
mkdir -p c/d &&
git mv c/b/a c/d/e &&
git commit -m "c/b/a -> c/d/e" &&
git diff -M --summary HEAD^ HEAD >output &&
test_i18ngrep " c/{b/a => d/e} " output &&
git diff -M --stat HEAD^ HEAD >output &&
test_i18ngrep " c/{b/a => d/e} " output
'
test_expect_success 'rename pretty print with common suffix' '
mkdir d &&
git mv c/d/e d/e &&
git commit -m "c/d/e -> d/e" &&
git diff -M --summary HEAD^ HEAD >output &&
test_i18ngrep " {c/d => d}/e " output &&
git diff -M --stat HEAD^ HEAD >output &&
test_i18ngrep " {c/d => d}/e " output
'
test_expect_success 'rename pretty print with common prefix and suffix' '
mkdir d/f &&
git mv d/e d/f/e &&
git commit -m "d/e -> d/f/e" &&
git diff -M --summary HEAD^ HEAD >output &&
test_i18ngrep " d/{ => f}/e " output &&
git diff -M --stat HEAD^ HEAD >output &&
test_i18ngrep " d/{ => f}/e " output
'
test_expect_success 'rename pretty print common prefix and suffix overlap' '
mkdir d/f/f &&
git mv d/f/e d/f/f/e &&
git commit -m "d/f/e d/f/f/e" &&
git diff -M --summary HEAD^ HEAD >output &&
test_i18ngrep " d/f/{ => f}/e " output &&
git diff -M --stat HEAD^ HEAD >output &&
test_i18ngrep " d/f/{ => f}/e " output
'
test_expect_success 'diff-tree -l0 defaults to a big rename limit, not zero' '
test_write_lines line1 line2 line3 >myfile &&
git add myfile &&
git commit -m x &&
test_write_lines line1 line2 line4 >myotherfile &&
git rm myfile &&
git add myotherfile &&
git commit -m x &&
git diff-tree -M -l0 HEAD HEAD^ >actual &&
# Verify that a rename from myotherfile to myfile was detected
grep "myotherfile.*myfile" actual
'
test_expect_success 'basename similarity vs best similarity' '
mkdir subdir &&
test_write_lines line1 line2 line3 line4 line5 \
line6 line7 line8 line9 line10 >subdir/file.txt &&
git add subdir/file.txt &&
git commit -m "base txt" &&
git rm subdir/file.txt &&
test_write_lines line1 line2 line3 line4 line5 \
line6 line7 line8 >file.txt &&
test_write_lines line1 line2 line3 line4 line5 \
line6 line7 line8 line9 >file.md &&
git add file.txt file.md &&
git commit -a -m "rename" &&
git diff-tree -r -M --name-status HEAD^ HEAD >actual &&
diffcore-rename: guide inexact rename detection based on basenames Make use of the new find_basename_matches() function added in the last two patches, to find renames more rapidly in cases where we can match up files based on basenames. As a quick reminder (see the last two commit messages for more details), this means for example that docs/extensions.txt and docs/config/extensions.txt are considered likely renames if there are no remaining 'extensions.txt' files elsewhere among the added and deleted files, and if a similarity check confirms they are similar, then they are marked as a rename without looking for a better similarity match among other files. This is a behavioral change, as covered in more detail in the previous commit message. We do not use this heuristic together with either break or copy detection. The point of break detection is to say that filename similarity does not imply file content similarity, and we only want to know about file content similarity. The point of copy detection is to use more resources to check for additional similarities, while this is an optimization that uses far less resources but which might also result in finding slightly fewer similarities. So the idea behind this optimization goes against both of those features, and will be turned off for both. For the testcases mentioned in commit 557ac0350d ("merge-ort: begin performance work; instrument with trace2_region_* calls", 2020-10-28), this change improves the performance as follows: Before After no-renames: 13.815 s ± 0.062 s 13.294 s ± 0.103 s mega-renames: 1799.937 s ± 0.493 s 187.248 s ± 0.882 s just-one-mega: 51.289 s ± 0.019 s 5.557 s ± 0.017 s Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-02-14 07:51:49 +00:00
# subdir/file.txt is 88% similar to file.md, 78% similar to file.txt,
# but since same basenames are checked first...
cat >expected <<-\EOF &&
diffcore-rename: guide inexact rename detection based on basenames Make use of the new find_basename_matches() function added in the last two patches, to find renames more rapidly in cases where we can match up files based on basenames. As a quick reminder (see the last two commit messages for more details), this means for example that docs/extensions.txt and docs/config/extensions.txt are considered likely renames if there are no remaining 'extensions.txt' files elsewhere among the added and deleted files, and if a similarity check confirms they are similar, then they are marked as a rename without looking for a better similarity match among other files. This is a behavioral change, as covered in more detail in the previous commit message. We do not use this heuristic together with either break or copy detection. The point of break detection is to say that filename similarity does not imply file content similarity, and we only want to know about file content similarity. The point of copy detection is to use more resources to check for additional similarities, while this is an optimization that uses far less resources but which might also result in finding slightly fewer similarities. So the idea behind this optimization goes against both of those features, and will be turned off for both. For the testcases mentioned in commit 557ac0350d ("merge-ort: begin performance work; instrument with trace2_region_* calls", 2020-10-28), this change improves the performance as follows: Before After no-renames: 13.815 s ± 0.062 s 13.294 s ± 0.103 s mega-renames: 1799.937 s ± 0.493 s 187.248 s ± 0.882 s just-one-mega: 51.289 s ± 0.019 s 5.557 s ± 0.017 s Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-02-14 07:51:49 +00:00
A file.md
R078 subdir/file.txt file.txt
EOF
test_cmp expected actual
'
test_done