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diff: respect MIN_BLOCK_LENGTH for last block

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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@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan 2017-08-15 18:27:38 -07:00 committed by Junio C Hamano
parent 23b65f9528
commit 09153277f8
2 changed files with 59 additions and 7 deletions
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29
diff.c
View file

@ -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);
}

37
t/t4015-diff-whitespace.sh
View file

@ -1382,6 +1382,43 @@ 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 &&