static unsigned char null_sha1[20] = { 0, };
static int reverse_diff;
-static int generate_patch;
-static int line_termination = '\n';
-static int inter_name_termination = '\t';
static const char *external_diff(void)
{
void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
unsigned short mode)
{
- if (mode) { /* just playing defensive */
- spec->mode = mode;
+ if (mode) {
+ spec->mode = DIFF_FILE_CANON_MODE(mode);
memcpy(spec->sha1, sha1, 20);
spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
}
* infile2 infile2-sha1 infile2-mode [ rename-to ]
*
*/
-static void run_external_diff(const char *name,
+static void run_external_diff(const char *pgm,
+ const char *name,
const char *other,
struct diff_filespec *one,
struct diff_filespec *two,
if (pid < 0)
die("unable to fork");
if (!pid) {
- const char *pgm = external_diff();
if (pgm) {
if (one && two) {
const char *exec_arg[10];
remove_tempfile();
}
+static void run_diff(const char *name,
+ const char *other,
+ struct diff_filespec *one,
+ struct diff_filespec *two,
+ const char *xfrm_msg)
+{
+ const char *pgm = external_diff();
+ if (!pgm &&
+ DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
+ (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
+ /* a filepair that changes between file and symlink
+ * needs to be split into deletion and creation.
+ */
+ struct diff_filespec *null = alloc_filespec(two->path);
+ run_external_diff(NULL, name, other, one, null, xfrm_msg);
+ free(null);
+ null = alloc_filespec(one->path);
+ run_external_diff(NULL, name, other, null, two, xfrm_msg);
+ free(null);
+ }
+ else
+ run_external_diff(pgm, name, other, one, two, xfrm_msg);
+}
+
void diff_setup(int reverse_diff_)
{
reverse_diff = reverse_diff_;
dp->one = one;
dp->two = two;
dp->score = 0;
- dp->orig_order = queue->nr;
- dp->rename_rank = 0;
diff_q(queue, dp);
return dp;
}
-static void diff_flush_raw(struct diff_filepair *p)
+static void diff_flush_raw(struct diff_filepair *p,
+ int line_termination,
+ int inter_name_termination)
{
int two_paths;
char status[10];
+
+ if (line_termination) {
+ const char *err = "path %s cannot be expressed without -z";
+ if (strchr(p->one->path, line_termination) ||
+ strchr(p->one->path, inter_name_termination))
+ die(err, p->one->path);
+ if (strchr(p->two->path, line_termination) ||
+ strchr(p->two->path, inter_name_termination))
+ die(err, p->two->path);
+ }
+
switch (p->status) {
case 'C': case 'R':
two_paths = 1;
- sprintf(status, "%c%1d", p->status, p->score);
+ sprintf(status, "%c%03d", p->status,
+ (int)(0.5 + p->score * 100.0/MAX_SCORE));
break;
default:
two_paths = 0;
one = p->one;
two = p->two;
- /* deletion, addition, mode change and renames are all interesting. */
+ /* deletion, addition, mode or type change
+ * and rename are all interesting.
+ */
if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
- (one->mode != two->mode) ||
+ DIFF_PAIR_MODE_CHANGED(p) ||
strcmp(one->path, two->path))
return 0;
const char *name, *other;
char msg_[PATH_MAX*2+200], *msg;
- /* diffcore_prune() keeps "stay" entries for diff-raw
- * copy/rename detection, but when we are generating
- * patches we do not need them.
- */
if (diff_unmodified_pair(p))
return;
"similarity index %d%%\n"
"copy from %s\n"
"copy to %s\n",
- (int)(0.5 + p->score * 100/MAX_SCORE),
+ (int)(0.5 + p->score * 100.0/MAX_SCORE),
p->one->path, p->two->path);
msg = msg_;
break;
"similarity index %d%%\n"
"rename old %s\n"
"rename new %s\n",
- (int)(0.5 + p->score * 100/MAX_SCORE),
+ (int)(0.5 + p->score * 100.0/MAX_SCORE),
p->one->path, p->two->path);
msg = msg_;
break;
}
if (DIFF_PAIR_UNMERGED(p))
- run_external_diff(name, NULL, NULL, NULL, NULL);
+ run_diff(name, NULL, NULL, NULL, NULL);
else
- run_external_diff(name, other, p->one, p->two, msg);
+ run_diff(name, other, p->one, p->two, msg);
}
int diff_needs_to_stay(struct diff_queue_struct *q, int i,
return 0;
}
-static int diff_used_as_source(struct diff_queue_struct *q, int lim,
- struct diff_filespec *it)
+int diff_queue_is_empty(void)
{
+ struct diff_queue_struct *q = &diff_queued_diff;
int i;
- for (i = 0; i < lim; i++) {
- struct diff_filepair *p = q->queue[i++];
- if (!strcmp(p->one->path, it->path))
- return 1;
- }
- return 0;
+ for (i = 0; i < q->nr; i++)
+ if (!diff_unmodified_pair(q->queue[i]))
+ return 0;
+ return 1;
}
-void diffcore_prune(void)
+#if DIFF_DEBUG
+void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
{
- /*
- * Although rename/copy detection wants to have "no-change"
- * entries fed into them, the downstream do not need to see
- * them, unless we had rename/copy for the same path earlier.
- * This function removes such entries.
- *
- * The applications that use rename/copy should:
- *
- * (1) feed change and "no-change" entries via diff_queue().
- * (2) call diffcore_rename, and any other future diffcore_xxx
- * that would benefit by still having "no-change" entries.
- * (3) call diffcore_prune
- * (4) call other diffcore_xxx that do not need to see
- * "no-change" entries.
- * (5) call diff_flush().
- */
- struct diff_queue_struct *q = &diff_queued_diff;
- struct diff_queue_struct outq;
- int i;
+ fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
+ x, one ? : "",
+ s->path,
+ DIFF_FILE_VALID(s) ? "valid" : "invalid",
+ s->mode,
+ s->sha1_valid ? sha1_to_hex(s->sha1) : "");
+ fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
+ x, one ? : "",
+ s->size, s->xfrm_flags);
+}
- outq.queue = NULL;
- outq.nr = outq.alloc = 0;
+void diff_debug_filepair(const struct diff_filepair *p, int i)
+{
+ diff_debug_filespec(p->one, i, "one");
+ diff_debug_filespec(p->two, i, "two");
+ fprintf(stderr, "score %d, status %c\n",
+ p->score, p->status ? : '?');
+}
+void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
+{
+ int i;
+ if (msg)
+ fprintf(stderr, "%s\n", msg);
+ fprintf(stderr, "q->nr = %d\n", q->nr);
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
- if (!diff_unmodified_pair(p) ||
- diff_used_as_source(q, i, p->one))
- diff_q(&outq, p);
- else
- free(p);
+ diff_debug_filepair(p, i);
}
- free(q->queue);
- *q = outq;
- return;
}
+#endif
-int diff_queue_is_empty(void)
+static void diff_resolve_rename_copy(void)
{
+ int i, j;
+ struct diff_filepair *p, *pp;
struct diff_queue_struct *q = &diff_queued_diff;
- return q->nr == 0;
+
+ /* This should not depend on the ordering of things. */
+
+ diff_debug_queue("resolve-rename-copy", q);
+
+ for (i = 0; i < q->nr; i++) {
+ p = q->queue[i];
+ p->status = 0; /* undecided */
+ if (DIFF_PAIR_UNMERGED(p))
+ p->status = 'U';
+ else if (!DIFF_FILE_VALID((p)->one))
+ p->status = 'N';
+ else if (!DIFF_FILE_VALID((p)->two)) {
+ /* Deletion record should be omitted if there
+ * are rename/copy entries using this one as
+ * the source. Then we can say one of them
+ * is a rename and the rest are copies.
+ */
+ p->status = 'D';
+ for (j = 0; j < q->nr; j++) {
+ pp = q->queue[j];
+ if (!strcmp(pp->one->path, p->one->path) &&
+ strcmp(pp->one->path, pp->two->path)) {
+ p->status = 'X';
+ break;
+ }
+ }
+ }
+ else if (DIFF_PAIR_TYPE_CHANGED(p))
+ p->status = 'T';
+
+ /* from this point on, we are dealing with a pair
+ * whose both sides are valid and of the same type, i.e.
+ * either in-place edit or rename/copy edit.
+ */
+ else if (strcmp(p->one->path, p->two->path)) {
+ /* See if there is somebody else anywhere that
+ * will keep the path (either modified or
+ * unmodified). If so, we have to be a copy,
+ * not a rename. In addition, if there is
+ * some other rename or copy that comes later
+ * than us that uses the same source, we
+ * have to be a copy, not a rename.
+ */
+ for (j = 0; j < q->nr; j++) {
+ pp = q->queue[j];
+ if (strcmp(pp->one->path, p->one->path))
+ continue;
+ if (!strcmp(pp->one->path, pp->two->path)) {
+ if (DIFF_FILE_VALID(pp->two)) {
+ /* non-delete */
+ p->status = 'C';
+ break;
+ }
+ continue;
+ }
+ /* pp is a rename/copy ... */
+ if (i < j) {
+ /* ... and comes later than us */
+ p->status = 'C';
+ break;
+ }
+ }
+ if (!p->status)
+ p->status = 'R';
+ }
+ else if (memcmp(p->one->sha1, p->two->sha1, 20) ||
+ p->one->mode != p->two->mode)
+ p->status = 'M';
+ else
+ /* this is a "no-change" entry */
+ p->status = 'X';
+ }
+ diff_debug_queue("resolve-rename-copy done", q);
}
void diff_flush(int diff_output_style, int resolve_rename_copy)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i;
+ int line_termination = '\n';
+ int inter_name_termination = '\t';
- generate_patch = 0;
- switch (diff_output_style) {
- case DIFF_FORMAT_HUMAN:
- line_termination = '\n';
- inter_name_termination = '\t';
- break;
- case DIFF_FORMAT_MACHINE:
+ if (diff_output_style == DIFF_FORMAT_MACHINE)
line_termination = inter_name_termination = 0;
- break;
- case DIFF_FORMAT_PATCH:
- generate_patch = 1;
- break;
- }
+ if (resolve_rename_copy)
+ diff_resolve_rename_copy();
+
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
- if (resolve_rename_copy) {
- if (DIFF_PAIR_UNMERGED(p))
- p->status = 'U';
- else if (!DIFF_FILE_VALID((p)->one))
- p->status = 'N';
- else if (!DIFF_FILE_VALID((p)->two))
- p->status = 'D';
- else if (strcmp(p->one->path, p->two->path)) {
- /* This is rename or copy. Which one is it? */
- if (diff_needs_to_stay(q, i+1, p->one))
- p->status = 'C';
- else
- p->status = 'R';
- }
- else
- p->status = 'M';
- }
- if (generate_patch)
+ if ((diff_output_style == DIFF_FORMAT_NO_OUTPUT) ||
+ (p->status == 'X'))
+ continue;
+ if (p->status == 0)
+ die("internal error in diff-resolve-rename-copy");
+ switch (diff_output_style) {
+ case DIFF_FORMAT_PATCH:
diff_flush_patch(p);
- else
- diff_flush_raw(p);
+ break;
+ case DIFF_FORMAT_HUMAN:
+ case DIFF_FORMAT_MACHINE:
+ diff_flush_raw(p, line_termination,
+ inter_name_termination);
+ break;
+ }
}
-
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
diff_free_filespec_data(p->one);
* with something like '=' or '*' (I haven't decided
* which but should not make any difference).
* Feeding the same new and old to diff_change()
- * also has the same effect. diffcore_prune() should
- * be used to filter uninteresting ones out before the
- * final output happens.
+ * also has the same effect.
+ * Before the final output happens, they are pruned after
+ * merged into rename/copy pairs as appropriate.
*/
if (reverse_diff)
addremove = (addremove == '+' ? '-' :
projects / git.git / blobdiff