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Commit | Line | Data |
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178cb243 LT |
1 | /* |
2 | * rev-parse.c | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | */ | |
6 | #include "cache.h" | |
a8be83fe LT |
7 | #include "commit.h" |
8 | ||
023d66ed LT |
9 | static char *def = NULL; |
10 | static int no_revs = 0; | |
11 | static int single_rev = 0; | |
12 | static int revs_only = 0; | |
13 | static int do_rev_argument = 1; | |
14 | static int output_revs = 0; | |
15 | ||
a8be83fe | 16 | static int get_extended_sha1(char *name, unsigned char *sha1); |
178cb243 | 17 | |
921d865e LT |
18 | /* |
19 | * Some arguments are relevant "revision" arguments, | |
20 | * others are about output format or other details. | |
21 | * This sorts it all out. | |
22 | */ | |
23 | static int is_rev_argument(const char *arg) | |
24 | { | |
25 | static const char *rev_args[] = { | |
26 | "--max-count=", | |
27 | "--max-age=", | |
28 | "--min-age=", | |
29 | "--merge-order", | |
30 | NULL | |
31 | }; | |
32 | const char **p = rev_args; | |
33 | ||
34 | for (;;) { | |
35 | const char *str = *p++; | |
36 | int len; | |
37 | if (!str) | |
38 | return 0; | |
39 | len = strlen(str); | |
40 | if (!strncmp(arg, str, len)) | |
41 | return 1; | |
42 | } | |
43 | } | |
44 | ||
023d66ed LT |
45 | static void show_rev(unsigned char *sha1) |
46 | { | |
47 | if (no_revs) | |
48 | return; | |
49 | output_revs++; | |
50 | puts(sha1_to_hex(sha1)); | |
51 | } | |
52 | ||
53 | static void show_antirev(unsigned char *sha1) | |
54 | { | |
55 | if (no_revs) | |
56 | return; | |
57 | output_revs++; | |
58 | printf("^%s\n", sha1_to_hex(sha1)); | |
59 | } | |
60 | ||
61 | static void show_rev_arg(char *rev) | |
62 | { | |
63 | if (no_revs) | |
64 | return; | |
65 | puts(rev); | |
66 | } | |
67 | ||
68 | static void show_norev(char *norev) | |
69 | { | |
70 | if (revs_only) | |
71 | return; | |
72 | puts(norev); | |
73 | } | |
74 | ||
75 | static void show_arg(char *arg) | |
76 | { | |
77 | if (do_rev_argument && is_rev_argument(arg)) | |
78 | show_rev_arg(arg); | |
79 | else | |
80 | show_norev(arg); | |
81 | } | |
82 | ||
a8be83fe LT |
83 | static int get_parent(char *name, unsigned char *result, int idx) |
84 | { | |
85 | unsigned char sha1[20]; | |
86 | int ret = get_extended_sha1(name, sha1); | |
87 | struct commit *commit; | |
88 | struct commit_list *p; | |
89 | ||
90 | if (ret) | |
91 | return ret; | |
92 | commit = lookup_commit_reference(sha1); | |
93 | if (!commit) | |
94 | return -1; | |
95 | if (parse_commit(commit)) | |
96 | return -1; | |
97 | p = commit->parents; | |
98 | while (p) { | |
99 | if (!--idx) { | |
100 | memcpy(result, p->item->object.sha1, 20); | |
101 | return 0; | |
102 | } | |
103 | p = p->next; | |
104 | } | |
105 | return -1; | |
106 | } | |
107 | ||
108 | /* | |
109 | * This is like "get_sha1()", except it allows "sha1 expressions", | |
218e441d | 110 | * notably "xyz^" for "parent of xyz" |
a8be83fe LT |
111 | */ |
112 | static int get_extended_sha1(char *name, unsigned char *sha1) | |
113 | { | |
114 | int parent; | |
115 | int len = strlen(name); | |
116 | ||
117 | parent = 1; | |
218e441d | 118 | if (len > 2 && name[len-1] >= '1' && name[len-1] <= '9') { |
a8be83fe LT |
119 | parent = name[len-1] - '0'; |
120 | len--; | |
121 | } | |
218e441d | 122 | if (len > 1 && name[len-1] == '^') { |
a8be83fe | 123 | int ret; |
218e441d | 124 | name[len-1] = 0; |
a8be83fe | 125 | ret = get_parent(name, sha1, parent); |
218e441d | 126 | name[len-1] = '^'; |
a8be83fe LT |
127 | if (!ret) |
128 | return 0; | |
129 | } | |
130 | return get_sha1(name, sha1); | |
131 | } | |
132 | ||
023d66ed LT |
133 | static void show_default(void) |
134 | { | |
135 | char *s = def; | |
136 | ||
137 | if (s) { | |
138 | unsigned char sha1[20]; | |
139 | ||
140 | def = NULL; | |
141 | if (!get_extended_sha1(s, sha1)) { | |
142 | show_rev(sha1); | |
143 | return; | |
144 | } | |
145 | show_arg(s); | |
146 | } | |
147 | } | |
148 | ||
178cb243 LT |
149 | int main(int argc, char **argv) |
150 | { | |
023d66ed | 151 | int i, as_is = 0; |
178cb243 LT |
152 | unsigned char sha1[20]; |
153 | ||
154 | for (i = 1; i < argc; i++) { | |
155 | char *arg = argv[i]; | |
156 | char *dotdot; | |
157 | ||
158 | if (as_is) { | |
023d66ed | 159 | show_norev(arg); |
178cb243 LT |
160 | continue; |
161 | } | |
162 | if (*arg == '-') { | |
163 | if (!strcmp(arg, "--")) { | |
023d66ed | 164 | show_default(); |
8ebb0184 LT |
165 | if (revs_only) |
166 | break; | |
178cb243 LT |
167 | as_is = 1; |
168 | } | |
169 | if (!strcmp(arg, "--default")) { | |
178cb243 LT |
170 | def = argv[i+1]; |
171 | i++; | |
172 | continue; | |
173 | } | |
8ebb0184 LT |
174 | if (!strcmp(arg, "--revs-only")) { |
175 | revs_only = 1; | |
176 | continue; | |
177 | } | |
178 | if (!strcmp(arg, "--no-revs")) { | |
179 | no_revs = 1; | |
180 | continue; | |
181 | } | |
023d66ed LT |
182 | if (!strcmp(arg, "--verify")) { |
183 | revs_only = 1; | |
184 | do_rev_argument = 0; | |
185 | single_rev = 1; | |
186 | continue; | |
921d865e | 187 | } |
023d66ed | 188 | show_arg(arg); |
178cb243 LT |
189 | continue; |
190 | } | |
178cb243 LT |
191 | dotdot = strstr(arg, ".."); |
192 | if (dotdot) { | |
193 | unsigned char end[20]; | |
194 | char *n = dotdot+2; | |
195 | *dotdot = 0; | |
a8be83fe | 196 | if (!get_extended_sha1(arg, sha1)) { |
178cb243 LT |
197 | if (!*n) |
198 | n = "HEAD"; | |
a8be83fe | 199 | if (!get_extended_sha1(n, end)) { |
8ebb0184 LT |
200 | if (no_revs) |
201 | continue; | |
202 | def = NULL; | |
023d66ed LT |
203 | show_rev(end); |
204 | show_antirev(sha1); | |
178cb243 LT |
205 | continue; |
206 | } | |
207 | } | |
208 | *dotdot = '.'; | |
209 | } | |
a8be83fe | 210 | if (!get_extended_sha1(arg, sha1)) { |
800644c5 LT |
211 | if (no_revs) |
212 | continue; | |
213 | def = NULL; | |
023d66ed | 214 | show_rev(sha1); |
800644c5 LT |
215 | continue; |
216 | } | |
a8be83fe | 217 | if (*arg == '^' && !get_extended_sha1(arg+1, sha1)) { |
800644c5 LT |
218 | if (no_revs) |
219 | continue; | |
220 | def = NULL; | |
023d66ed | 221 | show_antirev(sha1); |
800644c5 LT |
222 | continue; |
223 | } | |
023d66ed LT |
224 | show_default(); |
225 | show_norev(arg); | |
226 | } | |
227 | show_default(); | |
228 | if (single_rev && output_revs != 1) { | |
229 | fprintf(stderr, "Needed a single revision\n"); | |
230 | exit(1); | |
178cb243 | 231 | } |
178cb243 LT |
232 | return 0; |
233 | } |