Split "git-pull-script" into two parts
[git/git.git] / diff-tree-helper.c
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "strbuf.h"
6 #include "diff.h"
7
8 static int matches_pathspec(const char *name, const char **spec, int cnt)
9 {
10 int i;
11 int namelen = strlen(name);
12 for (i = 0; i < cnt; i++) {
13 int speclen = strlen(spec[i]);
14 if (! strncmp(spec[i], name, speclen) &&
15 speclen <= namelen &&
16 (name[speclen] == 0 ||
17 name[speclen] == '/'))
18 return 1;
19 }
20 return 0;
21 }
22
23 static int parse_oneside_change(const char *cp, struct diff_spec *one,
24 char *path)
25 {
26 int ch;
27
28 one->file_valid = one->sha1_valid = 1;
29 one->mode = 0;
30 while ((ch = *cp) && '0' <= ch && ch <= '7') {
31 one->mode = (one->mode << 3) | (ch - '0');
32 cp++;
33 }
34
35 if (strncmp(cp, "\tblob\t", 6))
36 return -1;
37 cp += 6;
38 if (get_sha1_hex(cp, one->blob_sha1))
39 return -1;
40 cp += 40;
41 if (*cp++ != '\t')
42 return -1;
43 strcpy(path, cp);
44 return 0;
45 }
46
47 static int parse_diff_tree_output(const char *buf,
48 const char **spec, int cnt, int reverse)
49 {
50 struct diff_spec old, new;
51 char path[PATH_MAX];
52 const char *cp = buf;
53 int ch;
54
55 switch (*cp++) {
56 case 'U':
57 if (!cnt || matches_pathspec(cp + 1, spec, cnt))
58 diff_unmerge(cp + 1);
59 return 0;
60 case '+':
61 old.file_valid = 0;
62 parse_oneside_change(cp, &new, path);
63 break;
64 case '-':
65 new.file_valid = 0;
66 parse_oneside_change(cp, &old, path);
67 break;
68 case '*':
69 old.file_valid = old.sha1_valid =
70 new.file_valid = new.sha1_valid = 1;
71 old.mode = new.mode = 0;
72 while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
73 old.mode = (old.mode << 3) | (ch - '0');
74 cp++;
75 }
76 if (strncmp(cp, "->", 2))
77 return -1;
78 cp += 2;
79 while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
80 new.mode = (new.mode << 3) | (ch - '0');
81 cp++;
82 }
83 if (strncmp(cp, "\tblob\t", 6))
84 return -1;
85 cp += 6;
86 if (get_sha1_hex(cp, old.blob_sha1))
87 return -1;
88 cp += 40;
89 if (strncmp(cp, "->", 2))
90 return -1;
91 cp += 2;
92 if (get_sha1_hex(cp, new.blob_sha1))
93 return -1;
94 cp += 40;
95 if (*cp++ != '\t')
96 return -1;
97 strcpy(path, cp);
98 break;
99 default:
100 return -1;
101 }
102 if (!cnt || matches_pathspec(path, spec, cnt)) {
103 if (reverse)
104 run_external_diff(path, &new, &old);
105 else
106 run_external_diff(path, &old, &new);
107 }
108 return 0;
109 }
110
111 static const char *diff_tree_helper_usage =
112 "diff-tree-helper [-R] [-z] paths...";
113
114 int main(int ac, const char **av) {
115 struct strbuf sb;
116 int reverse = 0;
117 int line_termination = '\n';
118
119 strbuf_init(&sb);
120
121 while (1 < ac && av[1][0] == '-') {
122 if (av[1][1] == 'R')
123 reverse = 1;
124 else if (av[1][1] == 'z')
125 line_termination = 0;
126 else
127 usage(diff_tree_helper_usage);
128 ac--; av++;
129 }
130 /* the remaining parameters are paths patterns */
131
132 while (1) {
133 int status;
134 read_line(&sb, stdin, line_termination);
135 if (sb.eof)
136 break;
137 status = parse_diff_tree_output(sb.buf, av+1, ac-1, reverse);
138 if (status)
139 fprintf(stderr, "cannot parse %s\n", sb.buf);
140 }
141 return 0;
142 }