Merge branch 'pw/add-p-hunk-split-fix'

"git add -p" rewritten in C regressed hunk splitting in some cases,
which has been corrected.

* pw/add-p-hunk-split-fix:
  builtin add -p: fix hunk splitting
  t3701: clean up hunk splitting tests

Author: gitster

add-patch.c

@@ -383,6 +383,17 @@ static int is_octal(const char *p, size_t len)
 	return 1;
 }
 
+static void complete_file(char marker, struct hunk *hunk)
+{
+	if (marker == '-' || marker == '+')
+		/*
+		 * Last hunk ended in non-context line (i.e. it
+		 * appended lines to the file, so there are no
+		 * trailing context lines).
+		 */
+		hunk->splittable_into++;
+}
+
 static int parse_diff(struct add_p_state *s, const struct pathspec *ps)
 {
 	struct strvec args = STRVEC_INIT;
@@ -472,6 +483,7 @@ static int parse_diff(struct add_p_state *s, const struct pathspec *ps)
 			eol = pend;
 
 		if (starts_with(p, "diff ")) {
+			complete_file(marker, hunk);
 			ALLOC_GROW_BY(s->file_diff, s->file_diff_nr, 1,
 				   file_diff_alloc);
 			file_diff = s->file_diff + s->file_diff_nr - 1;
@@ -598,13 +610,7 @@ static int parse_diff(struct add_p_state *s, const struct pathspec *ps)
 				file_diff->hunk->colored_end = hunk->colored_end;
 		}
 	}
-
-	if (marker == '-' || marker == '+')
-		/*
-		 * Last hunk ended in non-context line (i.e. it appended lines
-		 * to the file, so there are no trailing context lines).
-		 */
-		hunk->splittable_into++;
+	complete_file(marker, hunk);
 
 	/* non-colored shorter than colored? */
 	if (colored_p != colored_pend) {

t/t3701-add-interactive.sh

@@ -326,7 +326,9 @@ test_expect_success 'correct message when there is nothing to do' '
 test_expect_success 'setup again' '
 	git reset --hard &&
 	test_chmod +x file &&
-	echo content >>file
+	echo content >>file &&
+	test_write_lines A B C D>file2 &&
+	git add file2
 '
 
 # Write the patch file with a new line at the top and bottom
@@ -341,13 +343,27 @@ test_expect_success 'setup patch' '
 	 content
 	+lastline
 	\ No newline at end of file
+	diff --git a/file2 b/file2
+	index 8422d40..35b930a 100644
+	--- a/file2
+	+++ b/file2
+	@@ -1,4 +1,5 @@
+	-A
+	+Z
+	 B
+	+Y
+	 C
+	-D
+	+X
 	EOF
 '
 
 # Expected output, diff is similar to the patch but w/ diff at the top
 test_expect_success 'setup expected' '
 	echo diff --git a/file b/file >expected &&
-	cat patch |sed "/^index/s/ 100644/ 100755/" >>expected &&
+	sed -e "/^index 180b47c/s/ 100644/ 100755/" \
+	    -e /1,5/s//1,4/ \
+	    -e /Y/d patch >>expected &&
 	cat >expected-output <<-\EOF
 	--- a/file
 	+++ b/file
@@ -366,16 +382,38 @@ test_expect_success 'setup expected' '
 	 content
 	+lastline
 	\ No newline at end of file
+	--- a/file2
+	+++ b/file2
+	@@ -1,4 +1,5 @@
+	-A
+	+Z
+	 B
+	+Y
+	 C
+	-D
+	+X
+	@@ -1,2 +1,2 @@
+	-A
+	+Z
+	 B
+	@@ -2,2 +2,3 @@
+	 B
+	+Y
+	 C
+	@@ -3,2 +4,2 @@
+	 C
+	-D
+	+X
 	EOF
 '
 
 # Test splitting the first patch, then adding both
 test_expect_success 'add first line works' '
 	git commit -am "clear local changes" &&
 	git apply patch &&
-	printf "%s\n" s y y | git add -p file 2>error |
-		sed -n -e "s/^([1-2]\/[1-2]) Stage this hunk[^@]*\(@@ .*\)/\1/" \
-		       -e "/^[-+@ \\\\]"/p  >output &&
+	test_write_lines s y y s y n y | git add -p 2>error >raw-output &&
+	sed -n -e "s/^([1-9]\/[1-9]) Stage this hunk[^@]*\(@@ .*\)/\1/" \
+	       -e "/^[-+@ \\\\]"/p raw-output >output &&
 	test_must_be_empty error &&
 	git diff --cached >diff &&
 	diff_cmp expected diff &&