#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
-#include <limits.h>
#include "cache.h"
#include "diff.h"
#include "diffcore.h"
static int generate_patch;
static int line_termination = '\n';
static int inter_name_termination = '\t';
-static const char **pathspec;
-static int speccnt;
static const char *external_diff(void)
{
spec->should_free = spec->should_munmap = 0;
spec->xfrm_flags = 0;
spec->size = 0;
- spec->data = 0;
+ spec->data = NULL;
spec->mode = 0;
memset(spec->sha1, 0, 20);
return spec;
else if (s->should_munmap)
munmap(s->data, s->size);
s->should_free = s->should_munmap = 0;
- s->data = 0;
+ s->data = NULL;
}
static void prep_temp_blob(struct diff_tempfile *temp,
remove_tempfile();
}
-static int matches_pathspec(const char *name)
-{
- int i;
- int namelen;
-
- if (speccnt == 0)
- return 1;
-
- namelen = strlen(name);
- for (i = 0; i < speccnt; i++) {
- int speclen = strlen(pathspec[i]);
- if (! strncmp(pathspec[i], name, speclen) &&
- speclen <= namelen &&
- (name[speclen] == 0 || name[speclen] == '/'))
- return 1;
- }
- return 0;
-}
-
/* An external diff command takes:
*
* diff-cmd name infile1 infile1-sha1 infile1-mode \
int status;
static int atexit_asked = 0;
- if (!matches_pathspec(name) && (!other || !matches_pathspec(other)))
- return;
-
if (one && two) {
prepare_temp_file(name, &temp[0], one);
prepare_temp_file(other ? : name, &temp[1], two);
*arg++ = other;
*arg++ = xfrm_msg;
}
- *arg = 0;
+ *arg = NULL;
execvp(pgm, (char *const*) exec_arg);
}
else
remove_tempfile();
}
-int diff_scoreopt_parse(const char *opt)
+void diff_setup(int reverse_diff_)
{
- int diglen, num, scale, i;
- if (opt[0] != '-' || (opt[1] != 'M' && opt[1] != 'C'))
- return -1; /* that is not a -M nor -C option */
- diglen = strspn(opt+2, "0123456789");
- if (diglen == 0 || strlen(opt+2) != diglen)
- return 0; /* use default */
- sscanf(opt+2, "%d", &num);
- for (i = 0, scale = 1; i < diglen; i++)
- scale *= 10;
-
- /* user says num divided by scale and we say internally that
- * is MAX_SCORE * num / scale.
- */
- return MAX_SCORE * num / scale;
+ reverse_diff = reverse_diff_;
}
-void diff_setup(int reverse_diff_, int diff_output_style)
+struct diff_queue_struct diff_queued_diff;
+
+void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
{
- reverse_diff = reverse_diff_;
- generate_patch = 0;
- switch (diff_output_style) {
- case DIFF_FORMAT_HUMAN:
- line_termination = '\n';
- inter_name_termination = '\t';
- break;
- case DIFF_FORMAT_MACHINE:
- line_termination = inter_name_termination = 0;
- break;
- case DIFF_FORMAT_PATCH:
- generate_patch = 1;
- break;
+ if (queue->alloc <= queue->nr) {
+ queue->alloc = alloc_nr(queue->alloc);
+ queue->queue = xrealloc(queue->queue,
+ sizeof(dp) * queue->alloc);
}
+ queue->queue[queue->nr++] = dp;
}
-struct diff_queue_struct diff_queued_diff;
-
struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
- struct diff_filespec *one,
- struct diff_filespec *two)
+ struct diff_filespec *one,
+ struct diff_filespec *two)
{
struct diff_filepair *dp = xmalloc(sizeof(*dp));
dp->one = one;
dp->two = two;
- dp->xfrm_msg = 0;
+ dp->score = 0;
dp->orig_order = queue->nr;
- dp->xfrm_work = 0;
- if (queue->alloc <= queue->nr) {
- queue->alloc = alloc_nr(queue->alloc);
- queue->queue = xrealloc(queue->queue,
- sizeof(dp) * queue->alloc);
- }
- queue->queue[queue->nr++] = dp;
+ dp->rename_rank = 0;
+ diff_q(queue, dp);
return dp;
}
static void diff_flush_raw(struct diff_filepair *p)
{
- /*
- * We used to reject rename/copy but new diff-raw can express them.
- */
+ if (DIFF_PAIR_UNMERGED(p)) {
+ printf("U %s%c", p->one->path, line_termination);
+ return;
+ }
printf(":%06o %06o %s ",
p->one->mode, p->two->mode, sha1_to_hex(p->one->sha1));
printf("%s%c%s%c%s%c",
p->two->path, line_termination);
}
-static void diff_flush_patch(struct diff_filepair *p)
-{
- const char *name, *other;
-
- name = p->one->path;
- other = (strcmp(name, p->two->path) ? p->two->path : NULL);
- if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
- (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
- return; /* no tree diffs in patch format */
-
- run_external_diff(name, other, p->one, p->two, p->xfrm_msg);
-}
-
-static int identical(struct diff_filespec *one, struct diff_filespec *two)
+int diff_unmodified_pair(struct diff_filepair *p)
{
/* This function is written stricter than necessary to support
* the currently implemented transformers, but the idea is to
* let transformers to produce diff_filepairs any way they want,
* and filter and clean them up here before producing the output.
*/
+ struct diff_filespec *one, *two;
+
+ if (DIFF_PAIR_UNMERGED(p))
+ return 0; /* unmerged is interesting */
- if (!DIFF_FILE_VALID(one) && !DIFF_FILE_VALID(two))
- return 1; /* not interesting */
+ one = p->one;
+ two = p->two;
/* deletion, addition, mode change and renames are all interesting. */
if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
return 0;
}
-static void diff_flush_one(struct diff_filepair *p)
+static void diff_flush_patch(struct diff_filepair *p, const char *msg)
{
- if (identical(p->one, p->two))
+ const char *name, *other;
+
+ /* 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;
- if (generate_patch)
- diff_flush_patch(p);
+
+ name = p->one->path;
+ other = (strcmp(name, p->two->path) ? p->two->path : NULL);
+ if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
+ (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
+ return; /* no tree diffs in patch format */
+
+ if (DIFF_PAIR_UNMERGED(p))
+ run_external_diff(name, NULL, NULL, NULL, NULL);
else
- diff_flush_raw(p);
+ run_external_diff(name, other, p->one, p->two, msg);
}
-int diff_queue_is_empty(void)
+int diff_needs_to_stay(struct diff_queue_struct *q, int i,
+ struct diff_filespec *it)
+{
+ /* If it will be used in later entry (either stay or used
+ * as the source of rename/copy), we need to copy, not rename.
+ */
+ while (i < q->nr) {
+ struct diff_filepair *p = q->queue[i++];
+ if (!DIFF_FILE_VALID(p->two))
+ continue; /* removed is fine */
+ if (strcmp(p->one->path, it->path))
+ continue; /* not relevant */
+
+ /* p has its src set to *it and it is not a delete;
+ * it will be used for in-place change, rename/copy,
+ * or just stays there. We cannot rename it out.
+ */
+ return 1;
+ }
+ return 0;
+}
+
+static int diff_used_as_source(struct diff_queue_struct *q, int lim,
+ struct diff_filespec *it)
+{
+ 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;
+}
+
+void diffcore_prune(void)
{
+ /*
+ * 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;
+ outq.queue = NULL;
+ outq.nr = outq.alloc = 0;
+
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
- if (!identical(p->one, p->two))
- return 0;
+ if (!diff_unmodified_pair(p) ||
+ diff_used_as_source(q, i, p->one))
+ diff_q(&outq, p);
+ else
+ free(p);
}
- return 1;
+ free(q->queue);
+ *q = outq;
+ return;
+}
+
+static void diff_flush_one(struct diff_filepair *p, const char *msg)
+{
+ if (generate_patch)
+ diff_flush_patch(p, msg);
+ else
+ diff_flush_raw(p);
}
-void diff_flush(const char **pathspec_, int speccnt_)
+int diff_queue_is_empty(void)
{
struct diff_queue_struct *q = &diff_queued_diff;
- int i;
+ return q->nr == 0;
+}
- pathspec = pathspec_;
- speccnt = speccnt_;
+void diff_flush(int diff_output_style)
+{
+ struct diff_queue_struct *q = &diff_queued_diff;
+ int i;
- for (i = 0; i < q->nr; i++)
- diff_flush_one(q->queue[i]);
+ generate_patch = 0;
+ switch (diff_output_style) {
+ case DIFF_FORMAT_HUMAN:
+ line_termination = '\n';
+ inter_name_termination = '\t';
+ break;
+ case DIFF_FORMAT_MACHINE:
+ line_termination = inter_name_termination = 0;
+ break;
+ case DIFF_FORMAT_PATCH:
+ generate_patch = 1;
+ break;
+ }
+ for (i = 0; i < q->nr; i++) {
+ char msg_[PATH_MAX*2+200], *msg = NULL;
+ struct diff_filepair *p = q->queue[i];
+ 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)) {
+ sprintf(msg_,
+ "similarity index %d%%\n"
+ "copy from %s\n"
+ "copy to %s\n",
+ (int)(0.5 + p->score * 100/MAX_SCORE),
+ p->one->path, p->two->path);
+ }
+ else
+ sprintf(msg_,
+ "similarity index %d%%\n"
+ "rename old %s\n"
+ "rename new %s\n",
+ (int)(0.5 + p->score * 100/MAX_SCORE),
+ p->one->path, p->two->path);
+ msg = msg_;
+ }
+ diff_flush_one(p, msg);
+ }
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
diff_free_filespec_data(p->one);
diff_free_filespec_data(p->two);
- free(p->xfrm_msg);
free(p);
}
free(q->queue);
* entries to the diff-core. They will be prefixed
* with something like '=' or '*' (I haven't decided
* which but should not make any difference).
- * Feeding the same new and old to diff_change() should
- * also have the same effect. diff_flush() should
- * filter the identical ones out at the final output
- * stage.
+ * 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.
*/
if (reverse_diff)
addremove = (addremove == '+' ? '-' :
void diff_unmerge(const char *path)
{
- if (generate_patch)
- run_external_diff(path, NULL, NULL, NULL, NULL);
- else
- printf("U %s%c", path, line_termination);
+ struct diff_filespec *one, *two;
+ one = alloc_filespec(path);
+ two = alloc_filespec(path);
+ diff_queue(&diff_queued_diff, one, two);
}
projects / git.git / blobdiff