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authorJunio C Hamano <gitster@pobox.com>2008-08-28 08:10:04 (GMT)
committerJunio C Hamano <gitster@pobox.com>2008-08-31 02:41:43 (GMT)
commite0af48e49682ea3345f932f6b9e7fa7c5e5e611a (patch)
tree43cd383edc42ef508071fa6886a9e1fe10a7d281 /xdiff
parentf2b25dd81f4ccbf42700bd15feeb2becf10331ab (diff)
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xdiff-merge: optionally show conflicts in "diff3 -m" style
When showing conflicting merges, we traditionally followed RCS's merge output format. The output shows: <<<<<<< postimage from one side; ======= postimage of the other side; and >>>>>>> Some poeple find it easier to be able to understand what is going on when they can view the common ancestor's version, which is used by "diff3 -m", which shows: <<<<<<< postimage from one side; ||||||| shared preimage; ======= postimage of the other side; and >>>>>>> This is an initial step to bring that as an optional feature to git. Only "git merge-file" has been converted, with "--diff3" option. Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'xdiff')
-rw-r--r--xdiff/xdiff.h6
-rw-r--r--xdiff/xmerge.c103
2 files changed, 90 insertions, 19 deletions
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 413082e..deebe02 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -50,10 +50,16 @@ extern "C" {
#define XDL_BDOP_CPY 2
#define XDL_BDOP_INSB 3
+/* merge simplification levels */
#define XDL_MERGE_MINIMAL 0
#define XDL_MERGE_EAGER 1
#define XDL_MERGE_ZEALOUS 2
#define XDL_MERGE_ZEALOUS_ALNUM 3
+#define XDL_MERGE_LEVEL_MASK 0x0f
+
+/* merge output styles */
+#define XDL_MERGE_DIFF3 0x8000
+#define XDL_MERGE_STYLE_MASK 0x8000
typedef struct s_mmfile {
char *ptr;
diff --git a/xdiff/xmerge.c b/xdiff/xmerge.c
index 6ffaa4f..29cdbea 100644
--- a/xdiff/xmerge.c
+++ b/xdiff/xmerge.c
@@ -30,17 +30,32 @@ typedef struct s_xdmerge {
* 2 = no conflict, take second.
*/
int mode;
+ /*
+ * These point at the respective postimages. E.g. <i1,chg1> is
+ * how side #1 wants to change the common ancestor; if there is no
+ * overlap, lines before i1 in the postimage of side #1 appear
+ * in the merge result as a region touched by neither side.
+ */
long i1, i2;
long chg1, chg2;
+ /*
+ * These point at the preimage; of course there is just one
+ * preimage, that is from the shared common ancestor.
+ */
+ long i0;
+ long chg0;
} xdmerge_t;
static int xdl_append_merge(xdmerge_t **merge, int mode,
- long i1, long chg1, long i2, long chg2)
+ long i0, long chg0,
+ long i1, long chg1,
+ long i2, long chg2)
{
xdmerge_t *m = *merge;
if (m && (i1 <= m->i1 + m->chg1 || i2 <= m->i2 + m->chg2)) {
if (mode != m->mode)
m->mode = 0;
+ m->chg0 = i0 + chg0 - m->i0;
m->chg1 = i1 + chg1 - m->i1;
m->chg2 = i2 + chg2 - m->i2;
} else {
@@ -49,6 +64,8 @@ static int xdl_append_merge(xdmerge_t **merge, int mode,
return -1;
m->next = NULL;
m->mode = mode;
+ m->i0 = i0;
+ m->chg0 = chg0;
m->i1 = i1;
m->chg1 = chg1;
m->i2 = i2;
@@ -91,11 +108,13 @@ static int xdl_merge_cmp_lines(xdfenv_t *xe1, int i1, xdfenv_t *xe2, int i2,
return 0;
}
-static int xdl_recs_copy(xdfenv_t *xe, int i, int count, int add_nl, char *dest)
+static int xdl_recs_copy_0(int use_orig, xdfenv_t *xe, int i, int count, int add_nl, char *dest)
{
- xrecord_t **recs = xe->xdf2.recs + i;
+ xrecord_t **recs;
int size = 0;
+ recs = (use_orig ? xe->xdf1.recs : xe->xdf2.recs) + i;
+
if (count < 1)
return 0;
@@ -113,9 +132,19 @@ static int xdl_recs_copy(xdfenv_t *xe, int i, int count, int add_nl, char *dest)
return size;
}
+static int xdl_recs_copy(xdfenv_t *xe, int i, int count, int add_nl, char *dest)
+{
+ return xdl_recs_copy_0(0, xe, i, count, add_nl, dest);
+}
+
+static int xdl_orig_copy(xdfenv_t *xe, int i, int count, int add_nl, char *dest)
+{
+ return xdl_recs_copy_0(1, xe, i, count, add_nl, dest);
+}
+
static int fill_conflict_hunk(xdfenv_t *xe1, const char *name1,
xdfenv_t *xe2, const char *name2,
- int size, int i,
+ int size, int i, int style,
xdmerge_t *m, char *dest)
{
const int marker_size = 7;
@@ -143,6 +172,20 @@ static int fill_conflict_hunk(xdfenv_t *xe1, const char *name1,
/* Postimage from side #1 */
size += xdl_recs_copy(xe1, m->i1, m->chg1, 1,
dest ? dest + size : NULL);
+
+ if (style == XDL_MERGE_DIFF3) {
+ /* Shared preimage */
+ if (!dest) {
+ size += marker_size + 1;
+ } else {
+ for (j = 0; j < marker_size; j++)
+ dest[size++] = '|';
+ dest[size++] = '\n';
+ }
+ size += xdl_orig_copy(xe1, m->i0, m->chg0, 1,
+ dest ? dest + size : NULL);
+ }
+
if (!dest) {
size += marker_size + 1;
} else {
@@ -170,14 +213,15 @@ static int fill_conflict_hunk(xdfenv_t *xe1, const char *name1,
}
static int xdl_fill_merge_buffer(xdfenv_t *xe1, const char *name1,
- xdfenv_t *xe2, const char *name2, xdmerge_t *m, char *dest)
+ xdfenv_t *xe2, const char *name2,
+ xdmerge_t *m, char *dest, int style)
{
int size, i;
for (size = i = 0; m; m = m->next) {
if (m->mode == 0)
size = fill_conflict_hunk(xe1, name1, xe2, name2,
- size, i, m, dest);
+ size, i, style, m, dest);
else if (m->mode == 1)
size += xdl_recs_copy(xe1, i, m->i1 + m->chg1 - i, 0,
dest ? dest + size : NULL);
@@ -342,9 +386,11 @@ static int xdl_simplify_non_conflicts(xdfenv_t *xe1, xdmerge_t *m,
*/
static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1,
xdfenv_t *xe2, xdchange_t *xscr2, const char *name2,
- int level, xpparam_t const *xpp, mmbuffer_t *result) {
+ int flags, xpparam_t const *xpp, mmbuffer_t *result) {
xdmerge_t *changes, *c;
- int i1, i2, chg1, chg2;
+ int i0, i1, i2, chg0, chg1, chg2;
+ int level = flags & XDL_MERGE_LEVEL_MASK;
+ int style = flags & XDL_MERGE_STYLE_MASK;
c = changes = NULL;
@@ -352,11 +398,14 @@ static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1,
if (!changes)
changes = c;
if (xscr1->i1 + xscr1->chg1 < xscr2->i1) {
+ i0 = xscr1->i1;
i1 = xscr1->i2;
i2 = xscr2->i2 - xscr2->i1 + xscr1->i1;
+ chg0 = xscr1->chg1;
chg1 = xscr1->chg2;
chg2 = xscr1->chg1;
- if (xdl_append_merge(&c, 1, i1, chg1, i2, chg2)) {
+ if (xdl_append_merge(&c, 1,
+ i0, chg0, i1, chg1, i2, chg2)) {
xdl_cleanup_merge(changes);
return -1;
}
@@ -364,11 +413,14 @@ static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1,
continue;
}
if (xscr2->i1 + xscr2->chg1 < xscr1->i1) {
+ i0 = xscr2->i1;
i1 = xscr1->i2 - xscr1->i1 + xscr2->i1;
i2 = xscr2->i2;
+ chg0 = xscr2->chg1;
chg1 = xscr2->chg1;
chg2 = xscr2->chg2;
- if (xdl_append_merge(&c, 2, i1, chg1, i2, chg2)) {
+ if (xdl_append_merge(&c, 2,
+ i0, chg0, i1, chg1, i2, chg2)) {
xdl_cleanup_merge(changes);
return -1;
}
@@ -385,19 +437,26 @@ static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1,
int off = xscr1->i1 - xscr2->i1;
int ffo = off + xscr1->chg1 - xscr2->chg1;
+ i0 = xscr1->i1;
i1 = xscr1->i2;
i2 = xscr2->i2;
- if (off > 0)
+ if (off > 0) {
+ i0 -= off;
i1 -= off;
+ }
else
i2 += off;
+ chg0 = xscr1->i1 + xscr1->chg1 - i0;
chg1 = xscr1->i2 + xscr1->chg2 - i1;
chg2 = xscr2->i2 + xscr2->chg2 - i2;
if (ffo > 0)
chg2 += ffo;
- else
+ else {
+ chg0 -= ffo;
chg1 -= ffo;
- if (xdl_append_merge(&c, 0, i1, chg1, i2, chg2)) {
+ }
+ if (xdl_append_merge(&c, 0,
+ i0, chg0, i1, chg1, i2, chg2)) {
xdl_cleanup_merge(changes);
return -1;
}
@@ -414,11 +473,14 @@ static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1,
while (xscr1) {
if (!changes)
changes = c;
+ i0 = xscr1->i1;
i1 = xscr1->i2;
i2 = xscr1->i1 + xe2->xdf2.nrec - xe2->xdf1.nrec;
+ chg0 = xscr1->chg1;
chg1 = xscr1->chg2;
chg2 = xscr1->chg1;
- if (xdl_append_merge(&c, 1, i1, chg1, i2, chg2)) {
+ if (xdl_append_merge(&c, 1,
+ i0, chg0, i1, chg1, i2, chg2)) {
xdl_cleanup_merge(changes);
return -1;
}
@@ -427,11 +489,14 @@ static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1,
while (xscr2) {
if (!changes)
changes = c;
+ i0 = xscr2->i1;
i1 = xscr2->i1 + xe1->xdf2.nrec - xe1->xdf1.nrec;
i2 = xscr2->i2;
+ chg0 = xscr2->chg1;
chg1 = xscr2->chg1;
chg2 = xscr2->chg2;
- if (xdl_append_merge(&c, 2, i1, chg1, i2, chg2)) {
+ if (xdl_append_merge(&c, 2,
+ i0, chg0, i1, chg1, i2, chg2)) {
xdl_cleanup_merge(changes);
return -1;
}
@@ -449,7 +514,7 @@ static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1,
/* output */
if (result) {
int size = xdl_fill_merge_buffer(xe1, name1, xe2, name2,
- changes, NULL);
+ changes, NULL, style);
result->ptr = xdl_malloc(size);
if (!result->ptr) {
xdl_cleanup_merge(changes);
@@ -457,14 +522,14 @@ static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1,
}
result->size = size;
xdl_fill_merge_buffer(xe1, name1, xe2, name2, changes,
- result->ptr);
+ result->ptr, style);
}
return xdl_cleanup_merge(changes);
}
int xdl_merge(mmfile_t *orig, mmfile_t *mf1, const char *name1,
mmfile_t *mf2, const char *name2,
- xpparam_t const *xpp, int level, mmbuffer_t *result) {
+ xpparam_t const *xpp, int flags, mmbuffer_t *result) {
xdchange_t *xscr1, *xscr2;
xdfenv_t xe1, xe2;
int status;
@@ -501,7 +566,7 @@ int xdl_merge(mmfile_t *orig, mmfile_t *mf1, const char *name1,
} else {
status = xdl_do_merge(&xe1, xscr1, name1,
&xe2, xscr2, name2,
- level, xpp, result);
+ flags, xpp, result);
}
xdl_free_script(xscr1);
xdl_free_script(xscr2);