add 'git credential' plumbing command
[git/git.git] / builtin / patch-id.c
1 #include "builtin.h"
2
3 static void flush_current_id(int patchlen, unsigned char *id, git_SHA_CTX *c)
4 {
5 unsigned char result[20];
6 char name[50];
7
8 if (!patchlen)
9 return;
10
11 git_SHA1_Final(result, c);
12 memcpy(name, sha1_to_hex(id), 41);
13 printf("%s %s\n", sha1_to_hex(result), name);
14 git_SHA1_Init(c);
15 }
16
17 static int remove_space(char *line)
18 {
19 char *src = line;
20 char *dst = line;
21 unsigned char c;
22
23 while ((c = *src++) != '\0') {
24 if (!isspace(c))
25 *dst++ = c;
26 }
27 return dst - line;
28 }
29
30 static int scan_hunk_header(const char *p, int *p_before, int *p_after)
31 {
32 static const char digits[] = "0123456789";
33 const char *q, *r;
34 int n;
35
36 q = p + 4;
37 n = strspn(q, digits);
38 if (q[n] == ',') {
39 q += n + 1;
40 n = strspn(q, digits);
41 }
42 if (n == 0 || q[n] != ' ' || q[n+1] != '+')
43 return 0;
44
45 r = q + n + 2;
46 n = strspn(r, digits);
47 if (r[n] == ',') {
48 r += n + 1;
49 n = strspn(r, digits);
50 }
51 if (n == 0)
52 return 0;
53
54 *p_before = atoi(q);
55 *p_after = atoi(r);
56 return 1;
57 }
58
59 static int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx, struct strbuf *line_buf)
60 {
61 int patchlen = 0, found_next = 0;
62 int before = -1, after = -1;
63
64 while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {
65 char *line = line_buf->buf;
66 char *p = line;
67 int len;
68
69 if (!memcmp(line, "diff-tree ", 10))
70 p += 10;
71 else if (!memcmp(line, "commit ", 7))
72 p += 7;
73 else if (!memcmp(line, "From ", 5))
74 p += 5;
75 else if (!memcmp(line, "\\ ", 2) && 12 < strlen(line))
76 continue;
77
78 if (!get_sha1_hex(p, next_sha1)) {
79 found_next = 1;
80 break;
81 }
82
83 /* Ignore commit comments */
84 if (!patchlen && memcmp(line, "diff ", 5))
85 continue;
86
87 /* Parsing diff header? */
88 if (before == -1) {
89 if (!memcmp(line, "index ", 6))
90 continue;
91 else if (!memcmp(line, "--- ", 4))
92 before = after = 1;
93 else if (!isalpha(line[0]))
94 break;
95 }
96
97 /* Looking for a valid hunk header? */
98 if (before == 0 && after == 0) {
99 if (!memcmp(line, "@@ -", 4)) {
100 /* Parse next hunk, but ignore line numbers. */
101 scan_hunk_header(line, &before, &after);
102 continue;
103 }
104
105 /* Split at the end of the patch. */
106 if (memcmp(line, "diff ", 5))
107 break;
108
109 /* Else we're parsing another header. */
110 before = after = -1;
111 }
112
113 /* If we get here, we're inside a hunk. */
114 if (line[0] == '-' || line[0] == ' ')
115 before--;
116 if (line[0] == '+' || line[0] == ' ')
117 after--;
118
119 /* Compute the sha without whitespace */
120 len = remove_space(line);
121 patchlen += len;
122 git_SHA1_Update(ctx, line, len);
123 }
124
125 if (!found_next)
126 hashclr(next_sha1);
127
128 return patchlen;
129 }
130
131 static void generate_id_list(void)
132 {
133 unsigned char sha1[20], n[20];
134 git_SHA_CTX ctx;
135 int patchlen;
136 struct strbuf line_buf = STRBUF_INIT;
137
138 git_SHA1_Init(&ctx);
139 hashclr(sha1);
140 while (!feof(stdin)) {
141 patchlen = get_one_patchid(n, &ctx, &line_buf);
142 flush_current_id(patchlen, sha1, &ctx);
143 hashcpy(sha1, n);
144 }
145 strbuf_release(&line_buf);
146 }
147
148 static const char patch_id_usage[] = "git patch-id < patch";
149
150 int cmd_patch_id(int argc, const char **argv, const char *prefix)
151 {
152 if (argc != 1)
153 usage(patch_id_usage);
154
155 generate_id_list();
156 return 0;
157 }