mirror of
https://github.com/git/git
synced 2024-08-25 02:35:46 +00:00
470 lines
10 KiB
C
470 lines
10 KiB
C
![]() |
#include "cache.h"
|
||
|
#include "commit.h"
|
||
|
#include "diff.h"
|
||
|
#include "diffcore.h"
|
||
|
#include "quote.h"
|
||
|
|
||
|
struct path_list {
|
||
|
struct path_list *next;
|
||
|
int len;
|
||
|
char *path;
|
||
|
unsigned char sha1[20];
|
||
|
unsigned char parent_sha1[FLEX_ARRAY][20];
|
||
|
};
|
||
|
|
||
|
static int uninteresting(struct diff_filepair *p)
|
||
|
{
|
||
|
if (diff_unmodified_pair(p))
|
||
|
return 1;
|
||
|
if (!S_ISREG(p->one->mode) || !S_ISREG(p->two->mode))
|
||
|
return 1;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct path_list *intersect_paths(struct path_list *curr,
|
||
|
int n, int num_parent)
|
||
|
{
|
||
|
struct diff_queue_struct *q = &diff_queued_diff;
|
||
|
struct path_list *p;
|
||
|
int i;
|
||
|
|
||
|
if (!n) {
|
||
|
struct path_list *list = NULL, *tail = NULL;
|
||
|
for (i = 0; i < q->nr; i++) {
|
||
|
int len;
|
||
|
const char *path;
|
||
|
if (uninteresting(q->queue[i]))
|
||
|
continue;
|
||
|
path = q->queue[i]->two->path;
|
||
|
len = strlen(path);
|
||
|
|
||
|
p = xmalloc(sizeof(*p) + len + 1 + num_parent * 20);
|
||
|
p->path = (char*) &(p->parent_sha1[num_parent][0]);
|
||
|
memcpy(p->path, path, len);
|
||
|
p->path[len] = 0;
|
||
|
p->len = len;
|
||
|
p->next = NULL;
|
||
|
memcpy(p->sha1, q->queue[i]->two->sha1, 20);
|
||
|
memcpy(p->parent_sha1[n], q->queue[i]->one->sha1, 20);
|
||
|
if (!tail)
|
||
|
list = tail = p;
|
||
|
else {
|
||
|
tail->next = p;
|
||
|
p = tail;
|
||
|
}
|
||
|
}
|
||
|
return list;
|
||
|
}
|
||
|
|
||
|
for (p = curr; p; p = p->next) {
|
||
|
int found = 0;
|
||
|
if (!p->len)
|
||
|
continue;
|
||
|
for (i = 0; i < q->nr; i++) {
|
||
|
const char *path;
|
||
|
int len;
|
||
|
|
||
|
if (uninteresting(q->queue[i]))
|
||
|
continue;
|
||
|
path = q->queue[i]->two->path;
|
||
|
len = strlen(path);
|
||
|
if (len == p->len && !memcmp(path, p->path, len)) {
|
||
|
found = 1;
|
||
|
memcpy(p->parent_sha1[n],
|
||
|
q->queue[i]->one->sha1, 20);
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
if (!found)
|
||
|
p->len = 0;
|
||
|
}
|
||
|
return curr;
|
||
|
}
|
||
|
|
||
|
struct lline {
|
||
|
struct lline *next;
|
||
|
int len;
|
||
|
unsigned long parent_map;
|
||
|
char line[FLEX_ARRAY];
|
||
|
};
|
||
|
|
||
|
struct sline {
|
||
|
struct lline *lost_head, **lost_tail;
|
||
|
char *bol;
|
||
|
int len;
|
||
|
unsigned long flag;
|
||
|
};
|
||
|
|
||
|
static char *grab_blob(const unsigned char *sha1, unsigned long *size)
|
||
|
{
|
||
|
char *blob;
|
||
|
char type[20];
|
||
|
if (!memcmp(sha1, null_sha1, 20)) {
|
||
|
/* deleted blob */
|
||
|
*size = 0;
|
||
|
return xcalloc(1, 1);
|
||
|
}
|
||
|
blob = read_sha1_file(sha1, type, size);
|
||
|
if (strcmp(type, "blob"))
|
||
|
die("object '%s' is not a blob!", sha1_to_hex(sha1));
|
||
|
return blob;
|
||
|
}
|
||
|
|
||
|
#define TMPPATHLEN 50
|
||
|
#define MAXLINELEN 10240
|
||
|
|
||
|
static void write_to_temp_file(char *tmpfile, void *blob, unsigned long size)
|
||
|
{
|
||
|
int fd = git_mkstemp(tmpfile, TMPPATHLEN, ".diff_XXXXXX");
|
||
|
if (fd < 0)
|
||
|
die("unable to create temp-file");
|
||
|
if (write(fd, blob, size) != size)
|
||
|
die("unable to write temp-file");
|
||
|
close(fd);
|
||
|
}
|
||
|
|
||
|
static void write_temp_blob(char *tmpfile, const unsigned char *sha1)
|
||
|
{
|
||
|
unsigned long size;
|
||
|
void *blob;
|
||
|
blob = grab_blob(sha1, &size);
|
||
|
write_to_temp_file(tmpfile, blob, size);
|
||
|
free(blob);
|
||
|
}
|
||
|
|
||
|
static int parse_num(char **cp_p, unsigned int *num_p)
|
||
|
{
|
||
|
char *cp = *cp_p;
|
||
|
unsigned int num = 0;
|
||
|
int read_some;
|
||
|
|
||
|
while ('0' <= *cp && *cp <= '9')
|
||
|
num = num * 10 + *cp++ - '0';
|
||
|
if (!(read_some = cp - *cp_p))
|
||
|
return -1;
|
||
|
*cp_p = cp;
|
||
|
*num_p = num;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int parse_hunk_header(char *line, int len,
|
||
|
unsigned int *ob, unsigned int *on,
|
||
|
unsigned int *nb, unsigned int *nn)
|
||
|
{
|
||
|
char *cp;
|
||
|
cp = line + 4;
|
||
|
if (parse_num(&cp, ob)) {
|
||
|
bad_line:
|
||
|
return error("malformed diff output: %s", line);
|
||
|
}
|
||
|
if (*cp == ',') {
|
||
|
cp++;
|
||
|
if (parse_num(&cp, on))
|
||
|
goto bad_line;
|
||
|
}
|
||
|
else
|
||
|
*on = 1;
|
||
|
if (*cp++ != ' ' || *cp++ != '+')
|
||
|
goto bad_line;
|
||
|
if (parse_num(&cp, nb))
|
||
|
goto bad_line;
|
||
|
if (*cp == ',') {
|
||
|
cp++;
|
||
|
if (parse_num(&cp, nn))
|
||
|
goto bad_line;
|
||
|
}
|
||
|
else
|
||
|
*nn = 1;
|
||
|
return -!!memcmp(cp, " @@", 3);
|
||
|
}
|
||
|
|
||
|
static void append_lost(struct sline *sline, int n, const char *line)
|
||
|
{
|
||
|
struct lline *lline;
|
||
|
int len = strlen(line);
|
||
|
unsigned long this_mask = (1UL<<n);
|
||
|
if (line[len-1] == '\n')
|
||
|
len--;
|
||
|
|
||
|
/* Check to see if we can squash things */
|
||
|
if (sline->lost_head) {
|
||
|
struct lline *last_one = NULL;
|
||
|
/* We cannot squash it with earlier one */
|
||
|
for (lline = sline->lost_head;
|
||
|
lline;
|
||
|
lline = lline->next)
|
||
|
if (lline->parent_map & this_mask)
|
||
|
last_one = lline;
|
||
|
lline = last_one ? last_one->next : sline->lost_head;
|
||
|
while (lline) {
|
||
|
if (lline->len == len &&
|
||
|
!memcmp(lline->line, line, len)) {
|
||
|
lline->parent_map |= this_mask;
|
||
|
return;
|
||
|
}
|
||
|
lline = lline->next;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
lline = xmalloc(sizeof(*lline) + len + 1);
|
||
|
lline->len = len;
|
||
|
lline->next = NULL;
|
||
|
lline->parent_map = this_mask;
|
||
|
memcpy(lline->line, line, len);
|
||
|
lline->line[len] = 0;
|
||
|
if (sline->lost_head)
|
||
|
*(sline->lost_tail) = lline;
|
||
|
else
|
||
|
sline->lost_head = lline;
|
||
|
sline->lost_tail = &lline->next;
|
||
|
}
|
||
|
|
||
|
static void combine_diff(const unsigned char *parent, const char *ourtmp,
|
||
|
struct sline *sline, int cnt, int n)
|
||
|
{
|
||
|
FILE *in;
|
||
|
char parent_tmp[TMPPATHLEN];
|
||
|
char cmd[TMPPATHLEN * 2 + 1024];
|
||
|
char line[MAXLINELEN];
|
||
|
unsigned int lno, ob, on, nb, nn;
|
||
|
unsigned long pmask = ~(1UL << n);
|
||
|
struct sline *lost_bucket = NULL;
|
||
|
|
||
|
write_temp_blob(parent_tmp, parent);
|
||
|
sprintf(cmd, "diff --unified=0 -La/x -Lb/x '%s' '%s'",
|
||
|
parent_tmp, ourtmp);
|
||
|
in = popen(cmd, "r");
|
||
|
if (!in)
|
||
|
return;
|
||
|
|
||
|
lno = 1;
|
||
|
while (fgets(line, sizeof(line), in) != NULL) {
|
||
|
int len = strlen(line);
|
||
|
if (5 < len && !memcmp("@@ -", line, 4)) {
|
||
|
if (parse_hunk_header(line, len,
|
||
|
&ob, &on, &nb, &nn))
|
||
|
break;
|
||
|
lno = nb;
|
||
|
if (!nb) {
|
||
|
/* @@ -1,2 +0,0 @@ to remove the
|
||
|
* first two lines...
|
||
|
*/
|
||
|
nb = 1;
|
||
|
}
|
||
|
lost_bucket = &sline[nb-1]; /* sline is 0 based */
|
||
|
continue;
|
||
|
}
|
||
|
if (!lost_bucket)
|
||
|
continue;
|
||
|
switch (line[0]) {
|
||
|
case '-':
|
||
|
append_lost(lost_bucket, n, line+1);
|
||
|
break;
|
||
|
case '+':
|
||
|
sline[lno-1].flag &= pmask;
|
||
|
lno++;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
fclose(in);
|
||
|
unlink(parent_tmp);
|
||
|
}
|
||
|
|
||
|
static unsigned long context = 3;
|
||
|
static char combine_marker = '@';
|
||
|
|
||
|
static int interesting(struct sline *sline, unsigned long all_mask)
|
||
|
{
|
||
|
return ((sline->flag & all_mask) != all_mask || sline->lost_head);
|
||
|
}
|
||
|
|
||
|
static void make_hunks(struct sline *sline, unsigned long cnt, int num_parent)
|
||
|
{
|
||
|
unsigned long all_mask = (1UL<<num_parent) - 1;
|
||
|
unsigned long mark = (1UL<<num_parent);
|
||
|
unsigned long i;
|
||
|
|
||
|
i = 0;
|
||
|
while (i < cnt) {
|
||
|
if (interesting(&sline[i], all_mask)) {
|
||
|
unsigned long j = (context < i) ? i - context : 0;
|
||
|
while (j <= i)
|
||
|
sline[j++].flag |= mark;
|
||
|
while (++i < cnt) {
|
||
|
if (!interesting(&sline[i], all_mask))
|
||
|
break;
|
||
|
sline[i].flag |= mark;
|
||
|
}
|
||
|
j = (i + context < cnt) ? i + context : cnt;
|
||
|
while (i < j)
|
||
|
sline[i++].flag |= mark;
|
||
|
continue;
|
||
|
}
|
||
|
i++;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void dump_sline(struct sline *sline, int cnt, int num_parent)
|
||
|
{
|
||
|
unsigned long mark = (1UL<<num_parent);
|
||
|
int i;
|
||
|
int lno = 0;
|
||
|
|
||
|
while (1) {
|
||
|
struct sline *sl = &sline[lno];
|
||
|
int hunk_end;
|
||
|
while (lno < cnt && !(sline[lno].flag & mark))
|
||
|
lno++;
|
||
|
if (cnt <= lno)
|
||
|
break;
|
||
|
for (hunk_end = lno + 1; hunk_end < cnt; hunk_end++)
|
||
|
if (!(sline[hunk_end].flag & mark))
|
||
|
break;
|
||
|
for (i = 0; i <= num_parent; i++) putchar(combine_marker);
|
||
|
printf(" +%d,%d ", lno+1, hunk_end-lno);
|
||
|
for (i = 0; i <= num_parent; i++) putchar(combine_marker);
|
||
|
putchar('\n');
|
||
|
while (lno < hunk_end) {
|
||
|
struct lline *ll;
|
||
|
int j;
|
||
|
sl = &sline[lno++];
|
||
|
ll = sl->lost_head;
|
||
|
while (ll) {
|
||
|
for (j = 0; j < num_parent; j++) {
|
||
|
if (ll->parent_map & (1UL<<j))
|
||
|
putchar('-');
|
||
|
else
|
||
|
putchar(' ');
|
||
|
}
|
||
|
putchar(' ');
|
||
|
puts(ll->line);
|
||
|
ll = ll->next;
|
||
|
}
|
||
|
for (j = 0; j < num_parent; j++) {
|
||
|
if ((1UL<<j) & sl->flag)
|
||
|
putchar(' ');
|
||
|
else
|
||
|
putchar('+');
|
||
|
}
|
||
|
printf(" %.*s\n", sl->len, sl->bol);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void show_combined_diff(struct path_list *elem, int num_parent)
|
||
|
{
|
||
|
unsigned long size, cnt, lno;
|
||
|
char *result, *cp, *ep;
|
||
|
struct sline *sline; /* survived lines */
|
||
|
int i;
|
||
|
char ourtmp[TMPPATHLEN];
|
||
|
|
||
|
/* Read the result of merge first */
|
||
|
result = grab_blob(elem->sha1, &size);
|
||
|
write_to_temp_file(ourtmp, result, size);
|
||
|
|
||
|
for (cnt = 0, cp = result; cp - result < size; cp++) {
|
||
|
if (*cp == '\n')
|
||
|
cnt++;
|
||
|
}
|
||
|
if (result[size-1] != '\n')
|
||
|
cnt++; /* incomplete line */
|
||
|
|
||
|
sline = xcalloc(cnt, sizeof(*sline));
|
||
|
ep = result;
|
||
|
sline[0].bol = result;
|
||
|
for (lno = 0, cp = result; cp - result < size; cp++) {
|
||
|
if (*cp == '\n') {
|
||
|
sline[lno].len = cp - sline[lno].bol;
|
||
|
sline[lno].flag = (1UL<<num_parent) - 1;
|
||
|
lno++;
|
||
|
if (lno < cnt)
|
||
|
sline[lno].bol = cp + 1;
|
||
|
}
|
||
|
}
|
||
|
if (result[size-1] != '\n') {
|
||
|
sline[cnt-1].len = size - (sline[cnt-1].bol - result);
|
||
|
sline[cnt-1].flag = (1UL<<num_parent) - 1;
|
||
|
}
|
||
|
|
||
|
for (i = 0; i < num_parent; i++)
|
||
|
combine_diff(elem->parent_sha1[i], ourtmp, sline, cnt, i);
|
||
|
|
||
|
make_hunks(sline, cnt, num_parent);
|
||
|
|
||
|
dump_sline(sline, cnt, num_parent);
|
||
|
unlink(ourtmp);
|
||
|
free(result);
|
||
|
|
||
|
for (i = 0; i < cnt; i++) {
|
||
|
if (sline[i].lost_head) {
|
||
|
struct lline *ll = sline[i].lost_head;
|
||
|
while (ll) {
|
||
|
struct lline *tmp = ll;
|
||
|
ll = ll->next;
|
||
|
free(tmp);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
free(sline);
|
||
|
}
|
||
|
|
||
|
int diff_tree_combined_merge(const unsigned char *sha1,
|
||
|
const char *header, int show_empty_merge)
|
||
|
{
|
||
|
struct commit *commit = lookup_commit(sha1);
|
||
|
struct diff_options diffopts;
|
||
|
struct commit_list *parents;
|
||
|
struct path_list *p, *paths = NULL;
|
||
|
int num_parent, i, num_paths;
|
||
|
|
||
|
diff_setup(&diffopts);
|
||
|
diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
|
||
|
diffopts.recursive = 1;
|
||
|
|
||
|
/* count parents */
|
||
|
for (parents = commit->parents, num_parent = 0;
|
||
|
parents;
|
||
|
parents = parents->next, num_parent++)
|
||
|
; /* nothing */
|
||
|
|
||
|
/* find set of paths that everybody touches */
|
||
|
for (parents = commit->parents, i = 0;
|
||
|
parents;
|
||
|
parents = parents->next, i++) {
|
||
|
struct commit *parent = parents->item;
|
||
|
diff_tree_sha1(parent->object.sha1, commit->object.sha1, "",
|
||
|
&diffopts);
|
||
|
paths = intersect_paths(paths, i, num_parent);
|
||
|
diff_flush(&diffopts);
|
||
|
}
|
||
|
|
||
|
/* find out surviving paths */
|
||
|
for (num_paths = 0, p = paths; p; p = p->next) {
|
||
|
if (p->len)
|
||
|
num_paths++;
|
||
|
}
|
||
|
if (num_paths || show_empty_merge) {
|
||
|
puts(header);
|
||
|
for (p = paths; p; p = p->next) {
|
||
|
if (!p->len)
|
||
|
continue;
|
||
|
printf("diff --combined ");
|
||
|
if (quote_c_style(p->path, NULL, NULL, 0))
|
||
|
quote_c_style(p->path, NULL, stdout, 0);
|
||
|
else
|
||
|
printf("%s", p->path);
|
||
|
putchar('\n');
|
||
|
show_combined_diff(p, num_parent);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Clean things up */
|
||
|
while (paths) {
|
||
|
struct path_list *tmp = paths;
|
||
|
paths = paths->next;
|
||
|
free(tmp);
|
||
|
}
|
||
|
return 0;
|
||
|
}
|