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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
'
check_diff changed_hello 'changed function'
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_failure ' 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 $(grep -c "^[ +-].*Begin" changed_includes.diff) -le 1
'
test_expect_failure ' context does not include trailing empty lines' '
test "$(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_failure ' 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)" != " "
'
test_done
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