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https://github.com/git/git
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f7a3d33f0f
This updates the output format to make administrative lines more consistent with the traditional diffs. The "index" line shows blob object names from each parents (separated by commas), double dots and the object name of the resulting blob. The hunk header line begins with N+1 '@' characters for N-way diff, the line number L of the first line in the hunk and line count C from the parent in "-L,C" format for each parents and then the line number of the first line in the hunk and line count from the resulting file in "+L,C" format, and finally N+1 '@' characters (earlier versions had the line numbers from the resulting file at the beginning). Signed-off-by: Junio C Hamano <junkio@cox.net>
797 lines
19 KiB
C
797 lines
19 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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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 combine_diff_path *intersect_paths(struct combine_diff_path *curr, 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 combine_diff_path *p;
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int i;
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if (!n) {
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struct combine_diff_path *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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/* Lines lost from parent */
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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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/* Lines surviving in the merge result */
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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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/* bit 0 up to (N-1) are on if the parent has this line (i.e.
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* we did not change it).
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* bit N is used for "interesting" lines, including context.
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*/
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unsigned long flag;
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unsigned long *p_lno;
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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, int num_parent)
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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, p_lno;
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unsigned long nmask = (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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die("cannot spawn %s", cmd);
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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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if (nn == 0)
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/* @@ -X,Y +N,0 @@ removed Y lines
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* that would have come *after* line N
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* in the result. Our lost buckets hang
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* to the line after the removed lines,
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*/
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lost_bucket = &sline[nb];
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else
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lost_bucket = &sline[nb-1];
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if (!sline[nb-1].p_lno)
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sline[nb-1].p_lno =
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xcalloc(num_parent,
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sizeof(unsigned long));
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sline[nb-1].p_lno[n] = ob;
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continue;
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}
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if (!lost_bucket)
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continue; /* not in any hunk yet */
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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 |= nmask;
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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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/* Assign line numbers for this parent.
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*
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* sline[lno].p_lno[n] records the first line number
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* (counting from 1) for parent N if the final hunk display
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* started by showing sline[lno] (possibly showing the lost
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* lines attached to it first).
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*/
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for (lno = 0, p_lno = 1; lno < cnt; lno++) {
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struct lline *ll;
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sline[lno].p_lno[n] = p_lno;
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/* How many lines would this sline advance the p_lno? */
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ll = sline[lno].lost_head;
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while (ll) {
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if (ll->parent_map & nmask)
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p_lno++; /* '-' means parent had it */
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ll = ll->next;
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}
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if (!(sline[lno].flag & nmask))
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p_lno++; /* no '+' means parent had it */
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}
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sline[lno].p_lno[n] = p_lno; /* trailer */
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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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/* If some parents lost lines here, or if we have added to
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* some parent, it is interesting.
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*/
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return ((sline->flag & all_mask) || sline->lost_head);
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}
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static unsigned long adjust_hunk_tail(struct sline *sline,
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unsigned long all_mask,
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unsigned long hunk_begin,
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unsigned long i)
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{
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/* i points at the first uninteresting line. If the last line
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* of the hunk was interesting only because it has some
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* deletion, then it is not all that interesting for the
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* purpose of giving trailing context lines. This is because
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* we output '-' line and then unmodified sline[i-1] itself in
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* that case which gives us one extra context line.
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*/
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if ((hunk_begin + 1 <= i) && !(sline[i-1].flag & all_mask))
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i--;
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return i;
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}
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static unsigned long find_next(struct sline *sline,
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unsigned long mark,
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unsigned long i,
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unsigned long cnt,
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int uninteresting)
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{
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/* We have examined up to i-1 and are about to look at i.
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* Find next interesting or uninteresting line. Here,
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* "interesting" does not mean interesting(), but marked by
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* the give_context() function below (i.e. it includes context
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* lines that are not interesting to interesting() function
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* that are surrounded by interesting() ones.
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*/
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while (i < cnt)
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if (uninteresting
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? !(sline[i].flag & mark)
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: (sline[i].flag & mark))
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return i;
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else
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i++;
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return cnt;
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}
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static int give_context(struct sline *sline, unsigned long cnt, int num_parent)
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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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/* Two groups of interesting lines may have a short gap of
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* unintersting lines. Connect such groups to give them a
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* bit of context.
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*
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* We first start from what the interesting() function says,
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* and mark them with "mark", and paint context lines with the
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* mark. So interesting() would still say false for such context
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* lines but they are treated as "interesting" in the end.
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*/
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i = find_next(sline, mark, 0, cnt, 0);
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if (cnt <= i)
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return 0;
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while (i < cnt) {
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unsigned long j = (context < i) ? (i - context) : 0;
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unsigned long k;
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/* Paint a few lines before the first interesting line. */
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while (j < i)
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sline[j++].flag |= mark;
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again:
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/* we know up to i is to be included. where does the
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* next uninteresting one start?
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*/
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j = find_next(sline, mark, i, cnt, 1);
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if (cnt <= j)
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break; /* the rest are all interesting */
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/* lookahead context lines */
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k = find_next(sline, mark, j, cnt, 0);
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j = adjust_hunk_tail(sline, all_mask, i, j);
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if (k < j + context) {
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/* k is interesting and [j,k) are not, but
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* paint them interesting because the gap is small.
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*/
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while (j < k)
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sline[j++].flag |= mark;
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i = k;
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goto again;
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}
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/* j is the first uninteresting line and there is
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* no overlap beyond it within context lines. Paint
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* the trailing edge a bit.
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*/
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i = k;
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k = (j + context < cnt) ? j + context : cnt;
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while (j < k)
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sline[j++].flag |= mark;
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}
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return 1;
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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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for (i = 0; i < cnt; i++) {
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if (interesting(&sline[i], all_mask))
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sline[i].flag |= mark;
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else
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sline[i].flag &= ~mark;
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}
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if (!dense)
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return give_context(sline, cnt, num_parent);
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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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i = 0;
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while (i < cnt) {
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unsigned long j, hunk_begin, hunk_end;
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unsigned long same_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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hunk_begin = i;
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for (j = i + 1; j < cnt; j++) {
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if (!(sline[j].flag & mark)) {
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/* Look beyond the end to see if there
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* is an interesting line after this
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* hunk within context span.
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*/
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unsigned long la; /* lookahead */
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int contin = 0;
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la = adjust_hunk_tail(sline, all_mask,
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hunk_begin, j);
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la = (la + context < cnt) ?
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(la + context) : cnt;
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while (j <= --la) {
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if (sline[la].flag & mark) {
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contin = 1;
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break;
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}
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}
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if (!contin)
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break;
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j = la;
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}
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}
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hunk_end = j;
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/* [i..hunk_end) are interesting. Now is it really
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* interesting? We check if there are only two versions
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* and the result matches one of them. That is, we look
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* at:
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* (+) line, which records lines added to which parents;
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* this line appears in the result.
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* (-) line, which records from what parents the line
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* was removed; this line does not appear in the result.
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* then check the set of parents the result has difference
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* from, from all lines. If there are lines that has
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* different set of parents that the result has differences
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* from, that means we have more than two versions.
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*
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* Even when we have only two versions, if the result does
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* not match any of the parents, the it should be considered
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* interesting. In such a case, we would have all '+' line.
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* After passing the above "two versions" test, that would
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* appear as "the same set of parents" to be "all parents".
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*/
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same_diff = 0;
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has_interesting = 0;
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for (j = i; j < hunk_end && !has_interesting; j++) {
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unsigned long this_diff = sline[j].flag & all_mask;
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struct lline *ll = sline[j].lost_head;
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if (this_diff) {
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/* This has some changes. Is it the
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* same as others?
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*/
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if (!same_diff)
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same_diff = this_diff;
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else if (same_diff != this_diff) {
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has_interesting = 1;
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break;
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}
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}
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while (ll && !has_interesting) {
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/* Lost this line from these parents;
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* who are they? Are they the same?
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*/
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this_diff = ll->parent_map;
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if (!same_diff)
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same_diff = this_diff;
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else if (same_diff != this_diff) {
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has_interesting = 1;
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}
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ll = ll->next;
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}
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}
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if (!has_interesting && same_diff != all_mask) {
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|
/* This hunk is not that interesting after all */
|
|
for (j = hunk_begin; j < hunk_end; j++)
|
|
sline[j].flag &= ~mark;
|
|
}
|
|
i = hunk_end;
|
|
}
|
|
|
|
has_interesting = give_context(sline, cnt, num_parent);
|
|
return has_interesting;
|
|
}
|
|
|
|
static void show_parent_lno(struct sline *sline, unsigned long l0, unsigned long l1, unsigned long cnt, int n)
|
|
{
|
|
l0 = sline[l0].p_lno[n];
|
|
l1 = sline[l1].p_lno[n];
|
|
printf(" -%lu,%lu", l0, l1-l0);
|
|
}
|
|
|
|
static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent)
|
|
{
|
|
unsigned long mark = (1UL<<num_parent);
|
|
int i;
|
|
unsigned long 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);
|
|
for (i = 0; i < num_parent; i++)
|
|
show_parent_lno(sline, lno, hunk_end, cnt, i);
|
|
printf(" +%lu,%lu ", 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;
|
|
unsigned long p_mask;
|
|
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(' ');
|
|
}
|
|
puts(ll->line);
|
|
ll = ll->next;
|
|
}
|
|
p_mask = 1;
|
|
for (j = 0; j < num_parent; j++) {
|
|
if (p_mask & sl->flag)
|
|
putchar('+');
|
|
else
|
|
putchar(' ');
|
|
p_mask <<= 1;
|
|
}
|
|
printf("%.*s\n", sl->len, sl->bol);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
|
|
int i, int j)
|
|
{
|
|
/* We have already examined parent j and we know parent i
|
|
* and parent j are the same, so reuse the combined result
|
|
* of parent j for parent i.
|
|
*/
|
|
unsigned long lno, imask, jmask;
|
|
imask = (1UL<<i);
|
|
jmask = (1UL<<j);
|
|
|
|
for (lno = 0; lno < cnt; lno++) {
|
|
struct lline *ll = sline->lost_head;
|
|
sline->p_lno[i] = sline->p_lno[j];
|
|
while (ll) {
|
|
if (ll->parent_map & jmask)
|
|
ll->parent_map |= imask;
|
|
ll = ll->next;
|
|
}
|
|
if (sline->flag & jmask)
|
|
sline->flag |= imask;
|
|
sline++;
|
|
}
|
|
}
|
|
|
|
int show_combined_diff(struct combine_diff_path *elem, int num_parent,
|
|
int dense, const char *header, int show_empty)
|
|
{
|
|
unsigned long size, cnt, lno;
|
|
char *result, *cp, *ep;
|
|
struct sline *sline; /* survived lines */
|
|
int i, show_hunks, shown_header = 0;
|
|
char ourtmp_buf[TMPPATHLEN];
|
|
char *ourtmp = ourtmp_buf;
|
|
|
|
/* Read the result of merge first */
|
|
if (memcmp(elem->sha1, null_sha1, 20)) {
|
|
result = grab_blob(elem->sha1, &size);
|
|
write_to_temp_file(ourtmp, result, size);
|
|
}
|
|
else {
|
|
struct stat st;
|
|
int fd;
|
|
ourtmp = elem->path;
|
|
if (0 <= (fd = open(ourtmp, O_RDONLY)) &&
|
|
!fstat(fd, &st)) {
|
|
int len = st.st_size;
|
|
int cnt = 0;
|
|
|
|
size = len;
|
|
result = xmalloc(len + 1);
|
|
while (cnt < len) {
|
|
int done = xread(fd, result+cnt, len-cnt);
|
|
if (done == 0)
|
|
break;
|
|
if (done < 0)
|
|
die("read error '%s'", ourtmp);
|
|
cnt += done;
|
|
}
|
|
result[len] = 0;
|
|
}
|
|
else {
|
|
/* deleted file */
|
|
size = 0;
|
|
result = xmalloc(1);
|
|
result[0] = 0;
|
|
ourtmp = "/dev/null";
|
|
}
|
|
if (0 <= fd)
|
|
close(fd);
|
|
}
|
|
|
|
for (cnt = 0, cp = result; cp - result < size; cp++) {
|
|
if (*cp == '\n')
|
|
cnt++;
|
|
}
|
|
if (result[size-1] != '\n')
|
|
cnt++; /* incomplete line */
|
|
|
|
sline = xcalloc(cnt+1, sizeof(*sline));
|
|
ep = result;
|
|
sline[0].bol = result;
|
|
for (lno = 0, cp = result; cp - result < size; cp++) {
|
|
if (*cp == '\n') {
|
|
sline[lno].lost_tail = &sline[lno].lost_head;
|
|
sline[lno].len = cp - sline[lno].bol;
|
|
sline[lno].flag = 0;
|
|
lno++;
|
|
if (lno < cnt)
|
|
sline[lno].bol = cp + 1;
|
|
}
|
|
}
|
|
if (result[size-1] != '\n') {
|
|
sline[cnt-1].lost_tail = &sline[cnt-1].lost_head;
|
|
sline[cnt-1].len = size - (sline[cnt-1].bol - result);
|
|
sline[cnt-1].flag = 0;
|
|
}
|
|
|
|
sline[0].p_lno = xcalloc((cnt+1) * num_parent, sizeof(unsigned long));
|
|
for (lno = 0; lno < cnt; lno++)
|
|
sline[lno+1].p_lno = sline[lno].p_lno + num_parent;
|
|
|
|
for (i = 0; i < num_parent; i++) {
|
|
int j;
|
|
for (j = 0; j < i; j++) {
|
|
if (!memcmp(elem->parent_sha1[i],
|
|
elem->parent_sha1[j], 20)) {
|
|
reuse_combine_diff(sline, cnt, i, j);
|
|
break;
|
|
}
|
|
}
|
|
if (i <= j)
|
|
combine_diff(elem->parent_sha1[i], ourtmp, sline,
|
|
cnt, i, num_parent);
|
|
}
|
|
|
|
show_hunks = make_hunks(sline, cnt, num_parent, dense);
|
|
|
|
if (show_hunks) {
|
|
if (header) {
|
|
shown_header++;
|
|
puts(header);
|
|
}
|
|
printf("diff --%s ", dense ? "cc" : "combined");
|
|
if (quote_c_style(elem->path, NULL, NULL, 0))
|
|
quote_c_style(elem->path, NULL, stdout, 0);
|
|
else
|
|
printf("%s", elem->path);
|
|
putchar('\n');
|
|
printf("index ");
|
|
for (i = 0; i < num_parent; i++) {
|
|
printf("%s%s",
|
|
i ? "," : "",
|
|
find_unique_abbrev(elem->parent_sha1[i],
|
|
DEFAULT_ABBREV));
|
|
}
|
|
printf("..%s\n",
|
|
find_unique_abbrev(elem->sha1, DEFAULT_ABBREV));
|
|
dump_sline(sline, cnt, num_parent);
|
|
}
|
|
if (ourtmp == ourtmp_buf)
|
|
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[0].p_lno);
|
|
free(sline);
|
|
return shown_header;
|
|
}
|
|
|
|
int diff_tree_combined_merge(const unsigned char *sha1,
|
|
const char *header,
|
|
int show_empty_merge, int dense)
|
|
{
|
|
struct commit *commit = lookup_commit(sha1);
|
|
struct diff_options diffopts;
|
|
struct commit_list *parents;
|
|
struct combine_diff_path *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) {
|
|
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 combine_diff_path *tmp = paths;
|
|
paths = paths->next;
|
|
free(tmp);
|
|
}
|
|
return 0;
|
|
}
|