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git/t/t4051-diff-function-context.sh
René Scharfe 5c3ed90f3f xdiff: show non-empty lines before functions with -W
Non-empty lines before a function definition are most likely comments
for that function and thus relevant.  Include them in function context.

Such a non-empty line might also belong to the preceeding function if
there is no separating blank line.  Stop extending the context upwards
also at the next function line to make sure only one extra function body
is shown at most.

Original-patch-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-21 09:36:06 +09:00

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#!/bin/sh
test_description='diff function context'
. ./test-lib.sh
dir="$TEST_DIRECTORY/t4051"
commit_and_tag () {
tag=$1 &&
shift &&
git add "$@" &&
test_tick &&
git commit -m "$tag" &&
git tag "$tag"
}
first_context_line () {
awk '
found {print; exit}
/^@@/ {found = 1}
'
}
last_context_line () {
sed -ne \$p
}
check_diff () {
name=$1
desc=$2
options="-W $3"
test_expect_success "$desc" '
git diff $options "$name^" "$name" >"$name.diff"
'
test_expect_success ' diff applies' '
test_when_finished "git reset --hard" &&
git checkout --detach "$name^" &&
git apply --index "$name.diff" &&
git diff --exit-code "$name"
'
}
test_expect_success 'setup' '
cat "$dir/includes.c" "$dir/dummy.c" "$dir/dummy.c" "$dir/hello.c" \
"$dir/dummy.c" "$dir/dummy.c" >file.c &&
commit_and_tag initial file.c &&
grep -v "delete me from hello" <file.c >file.c.new &&
mv file.c.new file.c &&
commit_and_tag changed_hello file.c &&
grep -v "delete me from includes" <file.c >file.c.new &&
mv file.c.new file.c &&
commit_and_tag changed_includes file.c &&
cat "$dir/appended1.c" >>file.c &&
commit_and_tag appended file.c &&
cat "$dir/appended2.c" >>file.c &&
commit_and_tag extended file.c &&
grep -v "Begin of second part" <file.c >file.c.new &&
mv file.c.new file.c &&
commit_and_tag long_common_tail file.c &&
git checkout initial &&
cat "$dir/hello.c" "$dir/dummy.c" >file.c &&
commit_and_tag hello_dummy file.c &&
# overlap function context of 1st change and -u context of 2nd change
grep -v "delete me from hello" <"$dir/hello.c" >file.c &&
sed "2a\\
extra line" <"$dir/dummy.c" >>file.c &&
commit_and_tag changed_hello_dummy file.c &&
git checkout initial &&
grep -v "delete me from hello" <file.c >file.c.new &&
mv file.c.new file.c &&
cat "$dir/appended1.c" >>file.c &&
commit_and_tag changed_hello_appended file.c
'
check_diff changed_hello 'changed function'
test_expect_success ' context includes comment' '
grep "^ .*Hello comment" changed_hello.diff
'
test_expect_success ' context includes begin' '
grep "^ .*Begin of hello" changed_hello.diff
'
test_expect_success ' context includes end' '
grep "^ .*End of hello" changed_hello.diff
'
test_expect_success ' context does not include other functions' '
test $(grep -c "^[ +-].*Begin" changed_hello.diff) -le 1
'
test_expect_success ' context does not include preceding empty lines' '
test "$(first_context_line <changed_hello.diff)" != " "
'
test_expect_success ' context does not include trailing empty lines' '
test "$(last_context_line <changed_hello.diff)" != " "
'
check_diff changed_includes 'changed includes'
test_expect_success ' context includes begin' '
grep "^ .*Begin.h" changed_includes.diff
'
test_expect_success ' context includes end' '
grep "^ .*End.h" changed_includes.diff
'
test_expect_success ' context does not include other functions' '
test $(grep -c "^[ +-].*Begin" changed_includes.diff) -le 1
'
test_expect_success ' context does not include trailing empty lines' '
test "$(last_context_line <changed_includes.diff)" != " "
'
check_diff appended 'appended function'
test_expect_success ' context includes begin' '
grep "^[+].*Begin of first part" appended.diff
'
test_expect_success ' context includes end' '
grep "^[+].*End of first part" appended.diff
'
test_expect_success ' context does not include other functions' '
test $(grep -c "^[ +-].*Begin" appended.diff) -le 1
'
check_diff extended 'appended function part'
test_expect_success ' context includes begin' '
grep "^ .*Begin of first part" extended.diff
'
test_expect_success ' context includes end' '
grep "^[+].*End of second part" extended.diff
'
test_expect_success ' context does not include other functions' '
test $(grep -c "^[ +-].*Begin" extended.diff) -le 2
'
test_expect_success ' context does not include preceding empty lines' '
test "$(first_context_line <extended.diff)" != " "
'
check_diff long_common_tail 'change with long common tail and no context' -U0
test_expect_success ' context includes begin' '
grep "^ .*Begin of first part" long_common_tail.diff
'
test_expect_success ' context includes end' '
grep "^ .*End of second part" long_common_tail.diff
'
test_expect_success ' context does not include other functions' '
test $(grep -c "^[ +-].*Begin" long_common_tail.diff) -le 2
'
test_expect_success ' context does not include preceding empty lines' '
test "$(first_context_line <long_common_tail.diff.diff)" != " "
'
check_diff changed_hello_appended 'changed function plus appended function'
test_expect_success ' context includes begin' '
grep "^ .*Begin of hello" changed_hello_appended.diff &&
grep "^[+].*Begin of first part" changed_hello_appended.diff
'
test_expect_success ' context includes end' '
grep "^ .*End of hello" changed_hello_appended.diff &&
grep "^[+].*End of first part" changed_hello_appended.diff
'
test_expect_success ' context does not include other functions' '
test $(grep -c "^[ +-].*Begin" changed_hello_appended.diff) -le 2
'
check_diff changed_hello_dummy 'changed two consecutive functions'
test_expect_success ' context includes begin' '
grep "^ .*Begin of hello" changed_hello_dummy.diff &&
grep "^ .*Begin of dummy" changed_hello_dummy.diff
'
test_expect_success ' context includes end' '
grep "^ .*End of hello" changed_hello_dummy.diff &&
grep "^ .*End of dummy" changed_hello_dummy.diff
'
test_expect_success ' overlapping hunks are merged' '
test $(grep -c "^@@" changed_hello_dummy.diff) -eq 1
'
test_done