[PATCH] Diffcore updates.
[git/git.git] / diff-helper.c
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include <limits.h>
5 #include "cache.h"
6 #include "strbuf.h"
7 #include "diff.h"
8
9 static int detect_rename = 0;
10 static int diff_score_opt = 0;
11 static const char *pickaxe = NULL;
12 static int diff_output_style = DIFF_FORMAT_PATCH;
13 static int line_termination = '\n';
14 static int inter_name_termination = '\t';
15
16 static int parse_diff_raw(char *buf1, char *buf2, char *buf3)
17 {
18 char old_path[PATH_MAX];
19 unsigned char old_sha1[20], new_sha1[20];
20 char *ep;
21 char *cp = buf1;
22 int ch, old_mode, new_mode;
23
24 old_mode = new_mode = 0;
25 while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
26 old_mode = (old_mode << 3) | (ch - '0');
27 cp++;
28 }
29 if (*cp++ != ' ')
30 return -1;
31 while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
32 new_mode = (new_mode << 3) | (ch - '0');
33 cp++;
34 }
35 if (*cp++ != ' ')
36 return -1;
37 if (get_sha1_hex(cp, old_sha1))
38 return -1;
39 cp += 40;
40 if (*cp++ != ' ')
41 return -1;
42 if (get_sha1_hex(cp, new_sha1))
43 return -1;
44 cp += 40;
45 if (*cp++ != inter_name_termination)
46 return -1;
47 if (buf2)
48 cp = buf2;
49 ep = strchr(cp, inter_name_termination);
50 if (!ep)
51 return -1;
52 *ep++ = 0;
53 strcpy(old_path, cp);
54 diff_guif(old_mode, new_mode, old_sha1, new_sha1,
55 old_path, buf3 ? buf3 : ep);
56 return 0;
57 }
58
59 static const char *diff_helper_usage =
60 "git-diff-helper [-z] [-R] [-M] [-C] [-S<string>] paths...";
61
62 int main(int ac, const char **av) {
63 struct strbuf sb1, sb2, sb3;
64 int reverse_diff = 0;
65
66 strbuf_init(&sb1);
67 strbuf_init(&sb2);
68 strbuf_init(&sb3);
69
70 while (1 < ac && av[1][0] == '-') {
71 if (av[1][1] == 'R')
72 reverse_diff = 1;
73 else if (av[1][1] == 'z')
74 line_termination = inter_name_termination = 0;
75 else if (av[1][1] == 'p') /* hidden from the help */
76 diff_output_style = DIFF_FORMAT_HUMAN;
77 else if (av[1][1] == 'P') /* hidden from the help */
78 diff_output_style = DIFF_FORMAT_MACHINE;
79 else if (av[1][1] == 'M') {
80 detect_rename = DIFF_DETECT_RENAME;
81 diff_score_opt = diff_scoreopt_parse(av[1]);
82 }
83 else if (av[1][1] == 'C') {
84 detect_rename = DIFF_DETECT_COPY;
85 diff_score_opt = diff_scoreopt_parse(av[1]);
86 }
87 else if (av[1][1] == 'S') {
88 pickaxe = av[1] + 2;
89 }
90 else
91 usage(diff_helper_usage);
92 ac--; av++;
93 }
94 /* the remaining parameters are paths patterns */
95
96 diff_setup(reverse_diff);
97 while (1) {
98 int status;
99 read_line(&sb1, stdin, line_termination);
100 if (sb1.eof)
101 break;
102 switch (sb1.buf[0]) {
103 case 'U':
104 diff_unmerge(sb1.buf + 2);
105 continue;
106 case ':':
107 break;
108 default:
109 goto unrecognized;
110 }
111 if (!line_termination) {
112 read_line(&sb2, stdin, line_termination);
113 if (sb2.eof)
114 break;
115 read_line(&sb3, stdin, line_termination);
116 if (sb3.eof)
117 break;
118 status = parse_diff_raw(sb1.buf+1, sb2.buf, sb3.buf);
119 }
120 else
121 status = parse_diff_raw(sb1.buf+1, NULL, NULL);
122 if (status) {
123 unrecognized:
124 diff_flush(diff_output_style);
125 printf("%s%c", sb1.buf, line_termination);
126 }
127 }
128 if (detect_rename)
129 diffcore_rename(detect_rename, diff_score_opt);
130 diffcore_prune();
131 if (pickaxe)
132 diffcore_pickaxe(pickaxe);
133 if (ac)
134 diffcore_pathspec(av + 1);
135 diff_flush(diff_output_style);
136 return 0;
137 }