ci: avoid brew for installing perforce
[git/debian.git] / builtin / patch-id.c
blob881fcf32732caf810789c254d31eb05058ca0187
1 #include "cache.h"
2 #include "builtin.h"
3 #include "config.h"
4 #include "diff.h"
6 static void flush_current_id(int patchlen, struct object_id *id, struct object_id *result)
8 if (patchlen)
9 printf("%s %s\n", oid_to_hex(result), oid_to_hex(id));
12 static int remove_space(char *line)
14 char *src = line;
15 char *dst = line;
16 unsigned char c;
18 while ((c = *src++) != '\0') {
19 if (!isspace(c))
20 *dst++ = c;
22 return dst - line;
25 static int scan_hunk_header(const char *p, int *p_before, int *p_after)
27 static const char digits[] = "0123456789";
28 const char *q, *r;
29 int n;
31 q = p + 4;
32 n = strspn(q, digits);
33 if (q[n] == ',') {
34 q += n + 1;
35 *p_before = atoi(q);
36 n = strspn(q, digits);
37 } else {
38 *p_before = 1;
41 if (n == 0 || q[n] != ' ' || q[n+1] != '+')
42 return 0;
44 r = q + n + 2;
45 n = strspn(r, digits);
46 if (r[n] == ',') {
47 r += n + 1;
48 *p_after = atoi(r);
49 n = strspn(r, digits);
50 } else {
51 *p_after = 1;
53 if (n == 0)
54 return 0;
56 return 1;
59 static int get_one_patchid(struct object_id *next_oid, struct object_id *result,
60 struct strbuf *line_buf, int stable)
62 int patchlen = 0, found_next = 0;
63 int before = -1, after = -1;
64 git_hash_ctx ctx;
66 the_hash_algo->init_fn(&ctx);
67 oidclr(result);
69 while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {
70 char *line = line_buf->buf;
71 const char *p = line;
72 int len;
74 if (!skip_prefix(line, "diff-tree ", &p) &&
75 !skip_prefix(line, "commit ", &p) &&
76 !skip_prefix(line, "From ", &p) &&
77 starts_with(line, "\\ ") && 12 < strlen(line))
78 continue;
80 if (!get_oid_hex(p, next_oid)) {
81 found_next = 1;
82 break;
85 /* Ignore commit comments */
86 if (!patchlen && !starts_with(line, "diff "))
87 continue;
89 /* Parsing diff header? */
90 if (before == -1) {
91 if (starts_with(line, "index "))
92 continue;
93 else if (starts_with(line, "--- "))
94 before = after = 1;
95 else if (!isalpha(line[0]))
96 break;
99 /* Looking for a valid hunk header? */
100 if (before == 0 && after == 0) {
101 if (starts_with(line, "@@ -")) {
102 /* Parse next hunk, but ignore line numbers. */
103 scan_hunk_header(line, &before, &after);
104 continue;
107 /* Split at the end of the patch. */
108 if (!starts_with(line, "diff "))
109 break;
111 /* Else we're parsing another header. */
112 if (stable)
113 flush_one_hunk(result, &ctx);
114 before = after = -1;
117 /* If we get here, we're inside a hunk. */
118 if (line[0] == '-' || line[0] == ' ')
119 before--;
120 if (line[0] == '+' || line[0] == ' ')
121 after--;
123 /* Compute the sha without whitespace */
124 len = remove_space(line);
125 patchlen += len;
126 the_hash_algo->update_fn(&ctx, line, len);
129 if (!found_next)
130 oidclr(next_oid);
132 flush_one_hunk(result, &ctx);
134 return patchlen;
137 static void generate_id_list(int stable)
139 struct object_id oid, n, result;
140 int patchlen;
141 struct strbuf line_buf = STRBUF_INIT;
143 oidclr(&oid);
144 while (!feof(stdin)) {
145 patchlen = get_one_patchid(&n, &result, &line_buf, stable);
146 flush_current_id(patchlen, &oid, &result);
147 oidcpy(&oid, &n);
149 strbuf_release(&line_buf);
152 static const char patch_id_usage[] = "git patch-id [--stable | --unstable]";
154 static int git_patch_id_config(const char *var, const char *value, void *cb)
156 int *stable = cb;
158 if (!strcmp(var, "patchid.stable")) {
159 *stable = git_config_bool(var, value);
160 return 0;
163 return git_default_config(var, value, cb);
166 int cmd_patch_id(int argc, const char **argv, const char *prefix)
168 int stable = -1;
170 git_config(git_patch_id_config, &stable);
172 /* If nothing is set, default to unstable. */
173 if (stable < 0)
174 stable = 0;
176 if (argc == 2 && !strcmp(argv[1], "--stable"))
177 stable = 1;
178 else if (argc == 2 && !strcmp(argv[1], "--unstable"))
179 stable = 0;
180 else if (argc != 1)
181 usage(patch_id_usage);
183 generate_id_list(stable);
184 return 0;