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combine-diff: special case --unified=0 

Even when --unified=0 is given, the main loop to show the
combined textual diff needs to handle a line that is unchanged
but has lines that were deleted relative to a parent before it
(because that is where the lost lines hang).  However, such a
line should not be emitted in the final output.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2007-02-03 12:37:54 -08:00
parent a9d1836b10
commit 3b0f5e88ee
1 changed files with 30 additions and 4 deletions
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34
combine-diff.c
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@ -482,11 +482,11 @@ static int make_hunks(struct sline *sline, unsigned long cnt,
return has_interesting;
}
static void show_parent_lno(struct sline *sline, unsigned long l0, unsigned long l1, int n)
static void show_parent_lno(struct sline *sline, unsigned long l0, unsigned long l1, int n, unsigned long null_context)
{
l0 = sline[l0].p_lno[n];
l1 = sline[l1].p_lno[n];
printf(" -%lu,%lu", l0, l1-l0);
printf(" -%lu,%lu", l0, l1-l0-null_context);
}
static int hunk_comment_line(const char *bol)
@ -519,6 +519,7 @@ static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent,
unsigned long hunk_end;
unsigned long rlines;
const char *hunk_comment = NULL;
unsigned long null_context = 0;
while (lno <= cnt && !(sline[lno].flag & mark)) {
if (hunk_comment_line(sline[lno].bol))
@ -535,10 +536,28 @@ static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent,
rlines = hunk_end - lno;
if (cnt < hunk_end)
rlines--; /* pointing at the last delete hunk */
if (!context) {
/*
* Even when running with --unified=0, all
* lines in the hunk needs to be processed in
* the loop below in order to show the
* deletion recorded in lost_head. However,
* we do not want to show the resulting line
* with all blank context markers in such a
* case. Compensate.
*/
unsigned long j;
for (j = lno; j < hunk_end; j++)
if (!(sline[j].flag & (mark-1)))
null_context++;
rlines -= null_context;
}
fputs(c_frag, stdout);
for (i = 0; i <= num_parent; i++) putchar(combine_marker);
for (i = 0; i < num_parent; i++)
show_parent_lno(sline, lno, hunk_end, i);
show_parent_lno(sline, lno, hunk_end, i, null_context);
printf(" +%lu,%lu ", lno+1, rlines);
for (i = 0; i <= num_parent; i++) putchar(combine_marker);
@ -578,8 +597,15 @@ static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent,
if (cnt < lno)
break;
p_mask = 1;
if (!(sl->flag & (mark-1)))
if (!(sl->flag & (mark-1))) {
/*
* This sline was here to hang the
* lost lines in front of it.
*/
if (!context)
continue;
fputs(c_plain, stdout);
}
else
fputs(c_new, stdout);
for (j = 0; j < num_parent; j++) {