зеркало из https://github.com/microsoft/git.git
574 строки
13 KiB
C
574 строки
13 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "quote.h"
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struct path_list {
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struct path_list *next;
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int len;
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char *path;
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unsigned char sha1[20];
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unsigned char parent_sha1[FLEX_ARRAY][20];
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};
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static int uninteresting(struct diff_filepair *p)
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{
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if (diff_unmodified_pair(p))
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return 1;
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if (!S_ISREG(p->one->mode) || !S_ISREG(p->two->mode))
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return 1;
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return 0;
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}
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static struct path_list *intersect_paths(struct path_list *curr,
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int n, int num_parent)
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{
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struct diff_queue_struct *q = &diff_queued_diff;
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struct path_list *p;
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int i;
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if (!n) {
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struct path_list *list = NULL, **tail = &list;
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for (i = 0; i < q->nr; i++) {
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int len;
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const char *path;
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if (uninteresting(q->queue[i]))
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continue;
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path = q->queue[i]->two->path;
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len = strlen(path);
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p = xmalloc(sizeof(*p) + len + 1 + num_parent * 20);
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p->path = (char*) &(p->parent_sha1[num_parent][0]);
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memcpy(p->path, path, len);
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p->path[len] = 0;
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p->len = len;
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p->next = NULL;
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memcpy(p->sha1, q->queue[i]->two->sha1, 20);
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memcpy(p->parent_sha1[n], q->queue[i]->one->sha1, 20);
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*tail = p;
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tail = &p->next;
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}
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return list;
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}
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for (p = curr; p; p = p->next) {
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int found = 0;
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if (!p->len)
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continue;
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for (i = 0; i < q->nr; i++) {
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const char *path;
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int len;
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if (uninteresting(q->queue[i]))
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continue;
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path = q->queue[i]->two->path;
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len = strlen(path);
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if (len == p->len && !memcmp(path, p->path, len)) {
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found = 1;
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memcpy(p->parent_sha1[n],
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q->queue[i]->one->sha1, 20);
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break;
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}
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}
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if (!found)
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p->len = 0;
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}
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return curr;
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}
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struct lline {
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struct lline *next;
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int len;
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unsigned long parent_map;
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char line[FLEX_ARRAY];
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};
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struct sline {
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struct lline *lost_head, **lost_tail;
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char *bol;
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int len;
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unsigned long flag;
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};
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static char *grab_blob(const unsigned char *sha1, unsigned long *size)
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{
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char *blob;
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char type[20];
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if (!memcmp(sha1, null_sha1, 20)) {
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/* deleted blob */
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*size = 0;
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return xcalloc(1, 1);
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}
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blob = read_sha1_file(sha1, type, size);
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if (strcmp(type, "blob"))
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die("object '%s' is not a blob!", sha1_to_hex(sha1));
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return blob;
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}
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#define TMPPATHLEN 50
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#define MAXLINELEN 10240
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static void write_to_temp_file(char *tmpfile, void *blob, unsigned long size)
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{
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int fd = git_mkstemp(tmpfile, TMPPATHLEN, ".diff_XXXXXX");
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if (fd < 0)
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die("unable to create temp-file");
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if (write(fd, blob, size) != size)
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die("unable to write temp-file");
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close(fd);
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}
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static void write_temp_blob(char *tmpfile, const unsigned char *sha1)
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{
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unsigned long size;
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void *blob;
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blob = grab_blob(sha1, &size);
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write_to_temp_file(tmpfile, blob, size);
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free(blob);
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}
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static int parse_num(char **cp_p, unsigned int *num_p)
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{
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char *cp = *cp_p;
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unsigned int num = 0;
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int read_some;
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while ('0' <= *cp && *cp <= '9')
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num = num * 10 + *cp++ - '0';
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if (!(read_some = cp - *cp_p))
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return -1;
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*cp_p = cp;
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*num_p = num;
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return 0;
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}
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static int parse_hunk_header(char *line, int len,
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unsigned int *ob, unsigned int *on,
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unsigned int *nb, unsigned int *nn)
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{
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char *cp;
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cp = line + 4;
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if (parse_num(&cp, ob)) {
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bad_line:
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return error("malformed diff output: %s", line);
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}
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if (*cp == ',') {
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cp++;
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if (parse_num(&cp, on))
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goto bad_line;
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}
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else
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*on = 1;
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if (*cp++ != ' ' || *cp++ != '+')
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goto bad_line;
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if (parse_num(&cp, nb))
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goto bad_line;
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if (*cp == ',') {
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cp++;
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if (parse_num(&cp, nn))
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goto bad_line;
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}
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else
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*nn = 1;
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return -!!memcmp(cp, " @@", 3);
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}
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static void append_lost(struct sline *sline, int n, const char *line)
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{
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struct lline *lline;
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int len = strlen(line);
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unsigned long this_mask = (1UL<<n);
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if (line[len-1] == '\n')
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len--;
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/* Check to see if we can squash things */
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if (sline->lost_head) {
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struct lline *last_one = NULL;
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/* We cannot squash it with earlier one */
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for (lline = sline->lost_head;
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lline;
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lline = lline->next)
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if (lline->parent_map & this_mask)
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last_one = lline;
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lline = last_one ? last_one->next : sline->lost_head;
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while (lline) {
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if (lline->len == len &&
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!memcmp(lline->line, line, len)) {
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lline->parent_map |= this_mask;
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return;
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}
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lline = lline->next;
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}
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}
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lline = xmalloc(sizeof(*lline) + len + 1);
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lline->len = len;
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lline->next = NULL;
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lline->parent_map = this_mask;
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memcpy(lline->line, line, len);
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lline->line[len] = 0;
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*sline->lost_tail = lline;
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sline->lost_tail = &lline->next;
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}
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static void combine_diff(const unsigned char *parent, const char *ourtmp,
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struct sline *sline, int cnt, int n)
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{
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FILE *in;
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char parent_tmp[TMPPATHLEN];
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char cmd[TMPPATHLEN * 2 + 1024];
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char line[MAXLINELEN];
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unsigned int lno, ob, on, nb, nn;
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unsigned long pmask = ~(1UL << n);
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struct sline *lost_bucket = NULL;
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write_temp_blob(parent_tmp, parent);
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sprintf(cmd, "diff --unified=0 -La/x -Lb/x '%s' '%s'",
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parent_tmp, ourtmp);
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in = popen(cmd, "r");
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if (!in)
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return;
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lno = 1;
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while (fgets(line, sizeof(line), in) != NULL) {
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int len = strlen(line);
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if (5 < len && !memcmp("@@ -", line, 4)) {
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if (parse_hunk_header(line, len,
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&ob, &on, &nb, &nn))
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break;
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lno = nb;
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if (!nb) {
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/* @@ -1,2 +0,0 @@ to remove the
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* first two lines...
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*/
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nb = 1;
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}
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lost_bucket = &sline[nb-1]; /* sline is 0 based */
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continue;
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}
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if (!lost_bucket)
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continue;
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switch (line[0]) {
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case '-':
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append_lost(lost_bucket, n, line+1);
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break;
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case '+':
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sline[lno-1].flag &= pmask;
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lno++;
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break;
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}
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}
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fclose(in);
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unlink(parent_tmp);
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}
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static unsigned long context = 3;
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static char combine_marker = '@';
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static int interesting(struct sline *sline, unsigned long all_mask)
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{
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return ((sline->flag & all_mask) != all_mask || sline->lost_head);
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}
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static unsigned long line_common_diff(struct sline *sline, unsigned long all_mask)
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{
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/*
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* Look at the line and see from which parents we have the
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* same difference.
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*/
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/* Lower bits of sline->flag records if the parent had this
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* line, so XOR with all_mask gives us on-bits for parents we
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* have differences with.
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*/
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unsigned long common_adds = (sline->flag ^ all_mask) & all_mask;
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unsigned long common_removes = all_mask;
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/* If all the parents have this line, that also counts as
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* having the same difference.
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*/
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if (!common_adds)
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common_adds = all_mask;
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if (sline->lost_head) {
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/* Lost head list records the lines removed from
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* the parents, and parent_map records from which
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* parent the line was removed.
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*/
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struct lline *ll;
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for (ll = sline->lost_head; ll; ll = ll->next) {
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common_removes &= ll->parent_map;
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}
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}
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return common_adds & common_removes;
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}
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static unsigned long line_all_diff(struct sline *sline, unsigned long all_mask)
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{
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/*
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* Look at the line and see from which parents we have some difference.
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*/
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unsigned long different = (sline->flag ^ all_mask) & all_mask;
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if (sline->lost_head) {
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/* Lost head list records the lines removed from
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* the parents, and parent_map records from which
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* parent the line was removed.
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*/
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struct lline *ll;
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for (ll = sline->lost_head; ll; ll = ll->next) {
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different |= ll->parent_map;
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}
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}
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return different;
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}
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static int make_hunks(struct sline *sline, unsigned long cnt,
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int num_parent, int dense)
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{
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unsigned long all_mask = (1UL<<num_parent) - 1;
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unsigned long mark = (1UL<<num_parent);
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unsigned long i;
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int has_interesting = 0;
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i = 0;
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while (i < cnt) {
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if (interesting(&sline[i], all_mask)) {
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unsigned long j = (context < i) ? i - context : 0;
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while (j <= i)
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sline[j++].flag |= mark;
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while (++i < cnt) {
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if (!interesting(&sline[i], all_mask))
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break;
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sline[i].flag |= mark;
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}
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j = (i + context < cnt) ? i + context : cnt;
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while (i < j)
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sline[i++].flag |= mark;
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has_interesting = 1;
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continue;
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}
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i++;
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}
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if (!dense)
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return has_interesting;
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/* Look at each hunk, and if we have changes from only one
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* parent, or the changes are the same from all but one
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* parent, mark that uninteresting.
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*/
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has_interesting = 0;
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i = 0;
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while (i < cnt) {
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int j, hunk_end, same, diff;
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unsigned long same_diff, all_diff;
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while (i < cnt && !(sline[i].flag & mark))
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i++;
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if (cnt <= i)
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break; /* No more interesting hunks */
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for (hunk_end = i + 1; hunk_end < cnt; hunk_end++)
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if (!(sline[hunk_end].flag & mark))
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break;
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/* [i..hunk_end) are interesting. Now does it have
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* the same change with all but one parent?
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*/
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same_diff = all_mask;
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all_diff = 0;
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for (j = i; j < hunk_end; j++) {
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same_diff &= line_common_diff(sline + j, all_mask);
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all_diff |= line_all_diff(sline + j, all_mask);
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}
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diff = same = 0;
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for (j = 0; j < num_parent; j++) {
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if (same_diff & (1UL<<j))
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same++;
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if (all_diff & (1UL<<j))
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diff++;
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}
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if ((num_parent - 1 <= same) || (diff == 1)) {
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/* This hunk is not that interesting after all */
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for (j = i; j < hunk_end; j++)
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sline[j].flag &= ~mark;
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}
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else
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has_interesting = 1;
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i = hunk_end;
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}
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return has_interesting;
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}
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static void dump_sline(struct sline *sline, int cnt, int num_parent)
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{
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unsigned long mark = (1UL<<num_parent);
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int i;
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int lno = 0;
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while (1) {
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struct sline *sl = &sline[lno];
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int hunk_end;
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while (lno < cnt && !(sline[lno].flag & mark))
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lno++;
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if (cnt <= lno)
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break;
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for (hunk_end = lno + 1; hunk_end < cnt; hunk_end++)
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if (!(sline[hunk_end].flag & mark))
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break;
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for (i = 0; i <= num_parent; i++) putchar(combine_marker);
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printf(" +%d,%d ", lno+1, hunk_end-lno);
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for (i = 0; i <= num_parent; i++) putchar(combine_marker);
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putchar('\n');
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while (lno < hunk_end) {
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struct lline *ll;
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int j;
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sl = &sline[lno++];
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ll = sl->lost_head;
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while (ll) {
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for (j = 0; j < num_parent; j++) {
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if (ll->parent_map & (1UL<<j))
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putchar('-');
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else
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putchar(' ');
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}
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puts(ll->line);
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ll = ll->next;
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}
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for (j = 0; j < num_parent; j++) {
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if ((1UL<<j) & sl->flag)
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putchar(' ');
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else
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putchar('+');
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}
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printf("%.*s\n", sl->len, sl->bol);
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}
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}
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}
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static int show_combined_diff(struct path_list *elem, int num_parent,
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int dense, const char *header, int show_empty)
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{
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unsigned long size, cnt, lno;
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char *result, *cp, *ep;
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struct sline *sline; /* survived lines */
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int i, show_hunks, shown_header = 0;
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char ourtmp[TMPPATHLEN];
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/* Read the result of merge first */
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result = grab_blob(elem->sha1, &size);
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write_to_temp_file(ourtmp, result, size);
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for (cnt = 0, cp = result; cp - result < size; cp++) {
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if (*cp == '\n')
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cnt++;
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}
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if (result[size-1] != '\n')
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cnt++; /* incomplete line */
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sline = xcalloc(cnt, sizeof(*sline));
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ep = result;
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sline[0].bol = result;
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for (lno = 0, cp = result; cp - result < size; cp++) {
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if (*cp == '\n') {
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sline[lno].lost_tail = &sline[lno].lost_head;
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sline[lno].len = cp - sline[lno].bol;
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sline[lno].flag = (1UL<<num_parent) - 1;
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lno++;
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if (lno < cnt)
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sline[lno].bol = cp + 1;
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}
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}
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if (result[size-1] != '\n') {
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sline[cnt-1].lost_tail = &sline[cnt-1].lost_head;
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sline[cnt-1].len = size - (sline[cnt-1].bol - result);
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sline[cnt-1].flag = (1UL<<num_parent) - 1;
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}
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for (i = 0; i < num_parent; i++)
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combine_diff(elem->parent_sha1[i], ourtmp, sline, cnt, i);
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show_hunks = make_hunks(sline, cnt, num_parent, dense);
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if (header && (show_hunks || show_empty)) {
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shown_header++;
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puts(header);
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}
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if (show_hunks) {
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printf("diff --%s ", dense ? "cc" : "combined");
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if (quote_c_style(elem->path, NULL, NULL, 0))
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quote_c_style(elem->path, NULL, stdout, 0);
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else
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printf("%s", elem->path);
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putchar('\n');
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dump_sline(sline, cnt, num_parent);
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}
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unlink(ourtmp);
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free(result);
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for (i = 0; i < cnt; i++) {
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if (sline[i].lost_head) {
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struct lline *ll = sline[i].lost_head;
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while (ll) {
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struct lline *tmp = ll;
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ll = ll->next;
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free(tmp);
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}
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}
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}
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free(sline);
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return shown_header;
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}
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int diff_tree_combined_merge(const unsigned char *sha1,
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const char *header,
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int show_empty_merge, int dense)
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{
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struct commit *commit = lookup_commit(sha1);
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struct diff_options diffopts;
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struct commit_list *parents;
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struct path_list *p, *paths = NULL;
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int num_parent, i, num_paths;
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diff_setup(&diffopts);
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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) {
|
|
for (p = paths; p; p = p->next) {
|
|
if (!p->len)
|
|
continue;
|
|
if (show_combined_diff(p, num_parent, dense, header,
|
|
show_empty_merge))
|
|
header = NULL;
|
|
}
|
|
}
|
|
|
|
/* Clean things up */
|
|
while (paths) {
|
|
struct path_list *tmp = paths;
|
|
paths = paths->next;
|
|
free(tmp);
|
|
}
|
|
return 0;
|
|
}
|