Merge branch 'jt/http-redact-cookies' into maint
[git.git] / builtin / patch-id.c
blob970d0d30b4f4107e667f3a75d172cc2d25b04b8f
1 #include "builtin.h"
2 #include "config.h"
4 static void flush_current_id(int patchlen, struct object_id *id, struct object_id *result)
6 char name[50];
8 if (!patchlen)
9 return;
11 memcpy(name, oid_to_hex(id), GIT_SHA1_HEXSZ + 1);
12 printf("%s %s\n", oid_to_hex(result), name);
15 static int remove_space(char *line)
17 char *src = line;
18 char *dst = line;
19 unsigned char c;
21 while ((c = *src++) != '\0') {
22 if (!isspace(c))
23 *dst++ = c;
25 return dst - line;
28 static int scan_hunk_header(const char *p, int *p_before, int *p_after)
30 static const char digits[] = "0123456789";
31 const char *q, *r;
32 int n;
34 q = p + 4;
35 n = strspn(q, digits);
36 if (q[n] == ',') {
37 q += n + 1;
38 n = strspn(q, digits);
40 if (n == 0 || q[n] != ' ' || q[n+1] != '+')
41 return 0;
43 r = q + n + 2;
44 n = strspn(r, digits);
45 if (r[n] == ',') {
46 r += n + 1;
47 n = strspn(r, digits);
49 if (n == 0)
50 return 0;
52 *p_before = atoi(q);
53 *p_after = atoi(r);
54 return 1;
57 static void flush_one_hunk(struct object_id *result, git_SHA_CTX *ctx)
59 unsigned char hash[GIT_MAX_RAWSZ];
60 unsigned short carry = 0;
61 int i;
63 git_SHA1_Final(hash, ctx);
64 git_SHA1_Init(ctx);
65 /* 20-byte sum, with carry */
66 for (i = 0; i < GIT_SHA1_RAWSZ; ++i) {
67 carry += result->hash[i] + hash[i];
68 result->hash[i] = carry;
69 carry >>= 8;
73 static int get_one_patchid(struct object_id *next_oid, struct object_id *result,
74 struct strbuf *line_buf, int stable)
76 int patchlen = 0, found_next = 0;
77 int before = -1, after = -1;
78 git_SHA_CTX ctx;
80 git_SHA1_Init(&ctx);
81 oidclr(result);
83 while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {
84 char *line = line_buf->buf;
85 const char *p = line;
86 int len;
88 if (!skip_prefix(line, "diff-tree ", &p) &&
89 !skip_prefix(line, "commit ", &p) &&
90 !skip_prefix(line, "From ", &p) &&
91 starts_with(line, "\\ ") && 12 < strlen(line))
92 continue;
94 if (!get_oid_hex(p, next_oid)) {
95 found_next = 1;
96 break;
99 /* Ignore commit comments */
100 if (!patchlen && !starts_with(line, "diff "))
101 continue;
103 /* Parsing diff header? */
104 if (before == -1) {
105 if (starts_with(line, "index "))
106 continue;
107 else if (starts_with(line, "--- "))
108 before = after = 1;
109 else if (!isalpha(line[0]))
110 break;
113 /* Looking for a valid hunk header? */
114 if (before == 0 && after == 0) {
115 if (starts_with(line, "@@ -")) {
116 /* Parse next hunk, but ignore line numbers. */
117 scan_hunk_header(line, &before, &after);
118 continue;
121 /* Split at the end of the patch. */
122 if (!starts_with(line, "diff "))
123 break;
125 /* Else we're parsing another header. */
126 if (stable)
127 flush_one_hunk(result, &ctx);
128 before = after = -1;
131 /* If we get here, we're inside a hunk. */
132 if (line[0] == '-' || line[0] == ' ')
133 before--;
134 if (line[0] == '+' || line[0] == ' ')
135 after--;
137 /* Compute the sha without whitespace */
138 len = remove_space(line);
139 patchlen += len;
140 git_SHA1_Update(&ctx, line, len);
143 if (!found_next)
144 oidclr(next_oid);
146 flush_one_hunk(result, &ctx);
148 return patchlen;
151 static void generate_id_list(int stable)
153 struct object_id oid, n, result;
154 int patchlen;
155 struct strbuf line_buf = STRBUF_INIT;
157 oidclr(&oid);
158 while (!feof(stdin)) {
159 patchlen = get_one_patchid(&n, &result, &line_buf, stable);
160 flush_current_id(patchlen, &oid, &result);
161 oidcpy(&oid, &n);
163 strbuf_release(&line_buf);
166 static const char patch_id_usage[] = "git patch-id [--stable | --unstable]";
168 static int git_patch_id_config(const char *var, const char *value, void *cb)
170 int *stable = cb;
172 if (!strcmp(var, "patchid.stable")) {
173 *stable = git_config_bool(var, value);
174 return 0;
177 return git_default_config(var, value, cb);
180 int cmd_patch_id(int argc, const char **argv, const char *prefix)
182 int stable = -1;
184 git_config(git_patch_id_config, &stable);
186 /* If nothing is set, default to unstable. */
187 if (stable < 0)
188 stable = 0;
190 if (argc == 2 && !strcmp(argv[1], "--stable"))
191 stable = 1;
192 else if (argc == 2 && !strcmp(argv[1], "--unstable"))
193 stable = 0;
194 else if (argc != 1)
195 usage(patch_id_usage);
197 generate_id_list(stable);
198 return 0;