Currently, MIN_BLOCK_LENGTH is only checked when diff encounters a line
that does not belong to the current block. In particular, this means
that MIN_BLOCK_LENGTH is not checked after all lines are encountered.
Perform that check.
Signed-off-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx>
---
diff.c | 29 ++++++++++++++++++++++-------
t/t4015-diff-whitespace.sh | 35 +++++++++++++++++++++++++++++++++++
2 files changed, 57 insertions(+), 7 deletions(-)
diff --git a/diff.c b/diff.c
index 23311f9c0..f598d8a3a 100644
--- a/diff.c
+++ b/diff.c
@@ -861,6 +861,26 @@ static int shrink_potential_moved_blocks(struct moved_entry **pmb,
return rp + 1;
}
+/*
+ * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
+ *
+ * Otherwise, if the last block has fewer lines than
+ * COLOR_MOVED_MIN_BLOCK_LENGTH, unset DIFF_SYMBOL_MOVED_LINE on all lines in
+ * that block.
+ *
+ * The last block consists of the (n - block_length)'th line up to but not
+ * including the nth line.
+ */
+static void adjust_last_block(struct diff_options *o, int n, int block_length)
+{
+ int i;
+ if (block_length >= COLOR_MOVED_MIN_BLOCK_LENGTH ||
+ o->color_moved == COLOR_MOVED_PLAIN)
+ return;
+ for (i = 1; i < block_length + 1; i++)
+ o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
+}
+
/* Find blocks of moved code, delegate actual coloring decision to helper */
static void mark_color_as_moved(struct diff_options *o,
struct hashmap *add_lines,
@@ -896,13 +916,7 @@ static void mark_color_as_moved(struct diff_options *o,
}
if (!match) {
- if (block_length < COLOR_MOVED_MIN_BLOCK_LENGTH &&
- o->color_moved != COLOR_MOVED_PLAIN) {
- for (i = 1; i < block_length + 1; i++) {
- l = &o->emitted_symbols->buf[n - i];
- l->flags &= ~DIFF_SYMBOL_MOVED_LINE;
- }
- }
+ adjust_last_block(o, n, block_length);
pmb_nr = 0;
block_length = 0;
continue;
@@ -944,6 +958,7 @@ static void mark_color_as_moved(struct diff_options *o,
if (flipped_block)
l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
}
+ adjust_last_block(o, n, block_length);
free(pmb);
}
diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh
index c3b697411..6f7758e5c 100755
--- a/t/t4015-diff-whitespace.sh
+++ b/t/t4015-diff-whitespace.sh
@@ -1382,6 +1382,41 @@ EOF
test_cmp expected actual
'
+test_expect_success '--color-moved block at end of diff output respects MIN_BLOCK_LENGTH' '
+ git reset --hard &&
+ >bar &&
+ cat <<-\EOF >foo &&
+ irrelevant_line
+ line1
+ EOF
+ git add foo bar &&
+ git commit -m x &&
+
+ cat <<-\EOF >bar &&
+ line1
+ EOF
+ cat <<-\EOF >foo &&
+ irrelevant_line
+ EOF
+
+ git diff HEAD --color-moved=zebra --no-renames | grep -v "index" | test_decode_color >actual &&
+ cat >expected <<-\EOF &&
+ <BOLD>diff --git a/bar b/bar<RESET>
+ <BOLD>--- a/bar<RESET>
+ <BOLD>+++ b/bar<RESET>
+ <CYAN>@@ -0,0 +1 @@<RESET>
+ <GREEN>+<RESET><GREEN>line1<RESET>
+ <BOLD>diff --git a/foo b/foo<RESET>
+ <BOLD>--- a/foo<RESET>
+ <BOLD>+++ b/foo<RESET>
+ <CYAN>@@ -1,2 +1 @@<RESET>
+ irrelevant_line<RESET>
+ <RED>-line1<RESET>
+ EOF
+
+ test_cmp expected actual
+'
+
test_expect_success 'move detection with submodules' '
test_create_repo bananas &&
echo ripe >bananas/recipe &&
--
2.14.1.480.gb18f417b89-goog
