[PATCH] diff: correct newline in summary for renamed files

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In 146fdb0dfe (diff.c: emit_diff_symbol learns about DIFF_SYMBOL_SUMMARY,
2017-06-29), the conversion from direct printing to the symbol emission
dropped the new line character for renamed, copied and rewritten files.

Add the emission of a newline, add a test for this case.

Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Helped-by: Jeff King <peff@xxxxxxxx>
Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
---

 Peff, I am undecided about the added 'diff --stat' call as that
 uses a completely different code path and would not show the mode
 change, but I guess we can just use it to document the current state.
 
 Thanks,
 Stefan

 diff.c                                        |  1 +
 t/t4013-diff-various.sh                       | 12 ++++++++++++
 t/t4013/diff.diff-tree_--stat_initial_mode    |  4 ++++
 t/t4013/diff.diff-tree_--summary_initial_mode |  3 +++
 t/t4013/diff.diff-tree_initial_mode           |  3 +++
 t/t4013/diff.log_--decorate=full_--all        |  6 ++++++
 t/t4013/diff.log_--decorate_--all             |  6 ++++++
 7 files changed, 35 insertions(+)
 create mode 100644 t/t4013/diff.diff-tree_--stat_initial_mode
 create mode 100644 t/t4013/diff.diff-tree_--summary_initial_mode
 create mode 100644 t/t4013/diff.diff-tree_initial_mode

diff --git a/diff.c b/diff.c
index 3c6a3e0faa..653bb2e72e 100644
--- a/diff.c
+++ b/diff.c
@@ -5272,6 +5272,7 @@ static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
 			strbuf_addch(&sb, ' ');
 			quote_c_style(p->two->path, &sb, NULL, 0);
 		}
+		strbuf_addch(&sb, '\n');
 		emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
 				 sb.buf, sb.len, 0);
 		strbuf_release(&sb);
diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh
index d09acfe48e..c515e3e53f 100755
--- a/t/t4013-diff-various.sh
+++ b/t/t4013-diff-various.sh
@@ -90,6 +90,14 @@ test_expect_success setup '
 	git commit -m "Rearranged lines in dir/sub" &&
 	git checkout master &&
 
+	GIT_AUTHOR_DATE="2006-06-26 00:06:00 +0000" &&
+	GIT_COMMITTER_DATE="2006-06-26 00:06:00 +0000" &&
+	export GIT_AUTHOR_DATE GIT_COMMITTER_DATE &&
+	git checkout -b mode initial &&
+	git update-index --chmod=+x file0 &&
+	git commit -m "update mode" &&
+	git checkout -f master &&
+
 	git config diff.renames false &&
 
 	git show-branch
@@ -192,6 +200,10 @@ diff-tree --pretty side
 diff-tree --pretty -p side
 diff-tree --pretty --patch-with-stat side
 
+diff-tree initial mode
+diff-tree --stat initial mode
+diff-tree --summary initial mode
+
 diff-tree master
 diff-tree -p master
 diff-tree -p -m master
diff --git a/t/t4013/diff.diff-tree_--stat_initial_mode b/t/t4013/diff.diff-tree_--stat_initial_mode
new file mode 100644
index 0000000000..0e5943c2c6
--- /dev/null
+++ b/t/t4013/diff.diff-tree_--stat_initial_mode
@@ -0,0 +1,4 @@
+$ git diff-tree --stat initial mode
+ file0 | 0
+ 1 file changed, 0 insertions(+), 0 deletions(-)
+$
diff --git a/t/t4013/diff.diff-tree_--summary_initial_mode b/t/t4013/diff.diff-tree_--summary_initial_mode
new file mode 100644
index 0000000000..25846b6af8
--- /dev/null
+++ b/t/t4013/diff.diff-tree_--summary_initial_mode
@@ -0,0 +1,3 @@
+$ git diff-tree --summary initial mode
+ mode change 100644 => 100755 file0
+$
diff --git a/t/t4013/diff.diff-tree_initial_mode b/t/t4013/diff.diff-tree_initial_mode
new file mode 100644
index 0000000000..c47c09423e
--- /dev/null
+++ b/t/t4013/diff.diff-tree_initial_mode
@@ -0,0 +1,3 @@
+$ git diff-tree initial mode
+:100644 100755 01e79c32a8c99c557f0757da7cb6d65b3414466d 01e79c32a8c99c557f0757da7cb6d65b3414466d M	file0
+$
diff --git a/t/t4013/diff.log_--decorate=full_--all b/t/t4013/diff.log_--decorate=full_--all
index b345b2ebfa..2afe91f116 100644
--- a/t/t4013/diff.log_--decorate=full_--all
+++ b/t/t4013/diff.log_--decorate=full_--all
@@ -1,4 +1,10 @@
 $ git log --decorate=full --all
+commit b7e0bc69303b488b47deca799a7d723971dfa6cd (refs/heads/mode)
+Author: A U Thor <author@xxxxxxxxxxx>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    update mode
+
 commit cd4e72fd96faed3f0ba949dc42967430374e2290 (refs/heads/rearrange)
 Author: A U Thor <author@xxxxxxxxxxx>
 Date:   Mon Jun 26 00:06:00 2006 +0000
diff --git a/t/t4013/diff.log_--decorate_--all b/t/t4013/diff.log_--decorate_--all
index 3aa16a9e42..d0f308ab2b 100644
--- a/t/t4013/diff.log_--decorate_--all
+++ b/t/t4013/diff.log_--decorate_--all
@@ -1,4 +1,10 @@
 $ git log --decorate --all
+commit b7e0bc69303b488b47deca799a7d723971dfa6cd (mode)
+Author: A U Thor <author@xxxxxxxxxxx>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    update mode
+
 commit cd4e72fd96faed3f0ba949dc42967430374e2290 (rearrange)
 Author: A U Thor <author@xxxxxxxxxxx>
 Date:   Mon Jun 26 00:06:00 2006 +0000
-- 
2.14.0.rc0.3.g6c2e499285




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