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/*
* Copyright (C) 2005 Junio C Hamano
*/
#include "cache.h"
#include "strbuf.h"
#include "diff.h"
static int matches_pathspec(const char *name, char **spec, int cnt)
{
int i;
int namelen = strlen(name);
for (i = 0; i < cnt; i++) {
int speclen = strlen(spec[i]);
if (! strncmp(spec[i], name, speclen) &&
speclen <= namelen &&
(name[speclen] == 0 ||
name[speclen] == '/'))
return 1;
}
return 0;
}
static int parse_oneside_change(const char *cp, struct diff_spec *one,
char *path)
{
int ch;
one->file_valid = one->sha1_valid = 1;
one->mode = 0;
while ((ch = *cp) && '0' <= ch && ch <= '7') {
one->mode = (one->mode << 3) | (ch - '0');
cp++;
}
if (strncmp(cp, "\tblob\t", 6))
return -1;
cp += 6;
if (get_sha1_hex(cp, one->u.sha1))
return -1;
cp += 40;
if (*cp++ != '\t')
return -1;
strcpy(path, cp);
return 0;
}
#define PLEASE_WARN -1
#define WARNED_OURSELVES -2
static int parse_diff_tree_output(const char *buf,
struct diff_spec *old,
struct diff_spec *new,
char *path) {
const char *cp = buf;
int ch;
switch (*cp++) {
case 'U':
diff_unmerge(cp + 1);
return WARNED_OURSELVES;
case '+':
old->file_valid = 0;
return parse_oneside_change(cp, new, path);
case '-':
new->file_valid = 0;
return parse_oneside_change(cp, old, path);
case '*':
break;
default:
return PLEASE_WARN;
}
/* This is for '*' entries */
old->file_valid = old->sha1_valid = 1;
new->file_valid = new->sha1_valid = 1;
old->mode = new->mode = 0;
while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
old->mode = (old->mode << 3) | (ch - '0');
cp++;
}
if (strncmp(cp, "->", 2))
return PLEASE_WARN;
cp += 2;
while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
new->mode = (new->mode << 3) | (ch - '0');
cp++;
}
if (strncmp(cp, "\tblob\t", 6))
return PLEASE_WARN;
cp += 6;
if (get_sha1_hex(cp, old->u.sha1))
return PLEASE_WARN;
cp += 40;
if (strncmp(cp, "->", 2))
return PLEASE_WARN;
cp += 2;
if (get_sha1_hex(cp, new->u.sha1))
return PLEASE_WARN;
cp += 40;
if (*cp++ != '\t')
return PLEASE_WARN;
strcpy(path, cp);
return 0;
}
static const char *diff_tree_helper_usage =
"diff-tree-helper [-R] [-z] paths...";
int main(int ac, char **av) {
struct strbuf sb;
int reverse_diff = 0;
int line_termination = '\n';
strbuf_init(&sb);
while (1 < ac && av[1][0] == '-') {
if (av[1][1] == 'R')
reverse_diff = 1;
else if (av[1][1] == 'z')
line_termination = 0;
else
usage(diff_tree_helper_usage);
ac--; av++;
}
/* the remaining parameters are paths patterns */
while (1) {
int status;
struct diff_spec old, new;
char path[PATH_MAX];
read_line(&sb, stdin, line_termination);
if (sb.eof)
break;
status = parse_diff_tree_output(sb.buf, &old, &new, path);
if (status) {
if (status == PLEASE_WARN)
fprintf(stderr, "cannot parse %s\n", sb.buf);
continue;
}
if (1 < ac && !matches_pathspec(path, av+1, ac-1))
continue;
run_external_diff(path, &old, &new);
}
return 0;
}
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