[PATCH] pretty: fix lost indent after newline in %w()

[Andy Koppe <andy.koppe@gmail.com>]

When strbuf_add_wrapped_text() meets a newline followed by a
non-alphanumeric character, it treats it as a hard line break and jumps
to the new_line label. That code was written for the case where a line
gets too long. It moves past the space where the line was broken by
setting the next line's start to 'space + isspace(*space)'.

After a hard line break, 'space' already points to the first character
of the next line. If that character is whitespace, it was wrongly
skipped, so the line lost one column of indentation. For example,

  git log --format="%w(11) This is%n  the %s%n  commit."

printed " the ..." and " commit." rather than "  the ..." and
"  commit.".

Fix this by skipping the space only in the line-too-long case. In the
double-newline case, skip the second newline explicitly, because that
case relied on the old skipping.

Add a test for this, and update the expected output of the "magical
wrapping directives" test in t4205. There, %+d emits a newline followed
by " (tag: ...)", and that leading space is no longer lost. With a wrap
width of 1, the space now causes an extra line break.

Signed-off-by: Andy Koppe <andy.koppe@gmail.com>
---
 t/t4202-log.sh                | 6 ++++++
 t/t4205-log-pretty-formats.sh | 2 +-
 utf8.c                        | 4 +++-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index 06552a6271..5895780e8f 100755
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -94,6 +94,12 @@ test_expect_success 'format %w(,1,2)' '
 	test_cmp expect actual
 '
 
+test_expect_success 'format %w(11)' '
+
+	git log -2 --format="%w(11) This is%n  the %s%n  commit." > actual &&
+	test_cmp expect actual
+'
+
 cat > expect << EOF
 $(git rev-parse --short :/sixth  ) sixth
 $(git rev-parse --short :/fifth  ) fifth
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index 4be5c51489..0733f22d58 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -1139,7 +1139,7 @@ test_expect_success 'log --pretty with invalid padding format' '
 test_expect_success 'log --pretty with magical wrapping directives' '
 	commit_id=$(git commit-tree HEAD^{tree} -m "describe me") &&
 	git tag describe-me $commit_id &&
-	printf "\n(tag:\ndescribe-me)%%+w(2)" >expect &&
+	printf "\n\n(tag:\ndescribe-me)%%+w(2)" >expect &&
 	git log -1 --pretty="format:%w(1)%+d%+w(2)" $commit_id >actual &&
 	test_cmp expect actual
 '
diff --git a/utf8.c b/utf8.c
index 96460cc414..bb55bf357f 100644
--- a/utf8.c
+++ b/utf8.c
@@ -322,6 +322,7 @@ void strbuf_add_wrapped_text(struct strbuf *buf,
 					space++;
 					if (*space == '\n') {
 						strbuf_addch(buf, '\n');
+						space++;
 						goto new_line;
 					}
 					else if (!isalnum(*space))
@@ -333,9 +334,10 @@ void strbuf_add_wrapped_text(struct strbuf *buf,
 				text++;
 			}
 			else {
+				space += isspace(*space);
 new_line:
 				strbuf_addch(buf, '\n');
-				text = bol = space + isspace(*space);
+				text = bol = space;
 				space = NULL;
 				w = indent = indent2;
 			}
-- 
2.56.0