1/*
2 * rev-parse.c
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6#include "cache.h"
7#include "commit.h"
8#include "refs.h"
9#define DO_REVS 1
11#define DO_NOREV 2
12#define DO_FLAGS 4
13#define DO_NONFLAGS 8
14static int filter = ~0;
15static char *def = NULL;
17#define NORMAL 0
19#define REVERSED 1
20static int show_type = NORMAL;
21static int symbolic = 0;
22static int output_sq = 0;
23static int revs_count = 0;
25/*
27 * Some arguments are relevant "revision" arguments,
28 * others are about output format or other details.
29 * This sorts it all out.
30 */
31static int is_rev_argument(const char *arg)
32{
33 static const char *rev_args[] = {
34 "--bisect",
35 "--header",
36 "--max-age=",
37 "--max-count=",
38 "--merge-order",
39 "--min-age=",
40 "--no-merges",
41 "--objects",
42 "--parents",
43 "--pretty",
44 "--show-breaks",
45 "--topo-order",
46 "--unpacked",
47 NULL
48 };
49 const char **p = rev_args;
50 for (;;) {
52 const char *str = *p++;
53 int len;
54 if (!str)
55 return 0;
56 len = strlen(str);
57 if (!strcmp(arg, str) ||
58 (str[len-1] == '=' && !strncmp(arg, str, len)))
59 return 1;
60 }
61}
62/* Output argument as a string, either SQ or normal */
64static void show(const char *arg)
65{
66 if (output_sq) {
67 int sq = '\'', ch;
68 putchar(sq);
70 while ((ch = *arg++)) {
71 if (ch == sq)
72 fputs("'\\'", stdout);
73 putchar(ch);
74 }
75 putchar(sq);
76 putchar(' ');
77 }
78 else
79 puts(arg);
80}
81/* Output a revision, only if filter allows it */
83static void show_rev(int type, const unsigned char *sha1, const char *name)
84{
85 if (!(filter & DO_REVS))
86 return;
87 def = NULL;
88 revs_count++;
89 if (type != show_type)
91 putchar('^');
92 if (symbolic && name)
93 show(name);
94 else
95 show(sha1_to_hex(sha1));
96}
97/* Output a flag, only if filter allows it. */
99static void show_flag(char *arg)
100{
101 if (!(filter & DO_FLAGS))
102 return;
103 if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
104 show(arg);
105}
106static void show_default(void)
108{
109 char *s = def;
110 if (s) {
112 unsigned char sha1[20];
113 def = NULL;
115 if (!get_sha1(s, sha1)) {
116 show_rev(NORMAL, sha1, s);
117 return;
118 }
119 }
120}
121static int show_reference(const char *refname, const unsigned char *sha1)
123{
124 show_rev(NORMAL, sha1, refname);
125 return 0;
126}
127int main(int argc, char **argv)
129{
130 int i, as_is = 0, verify = 0;
131 unsigned char sha1[20];
132 const char *prefix = setup_git_directory();
133
134 for (i = 1; i < argc; i++) {
135 char *arg = argv[i];
136 char *dotdot;
137
138 if (as_is) {
139 show(arg);
140 continue;
141 }
142 if (*arg == '-') {
143 if (!strcmp(arg, "--")) {
144 as_is = 1;
145 continue;
146 }
147 if (!strcmp(arg, "--default")) {
148 def = argv[i+1];
149 i++;
150 continue;
151 }
152 if (!strcmp(arg, "--revs-only")) {
153 filter &= ~DO_NOREV;
154 continue;
155 }
156 if (!strcmp(arg, "--no-revs")) {
157 filter &= ~DO_REVS;
158 continue;
159 }
160 if (!strcmp(arg, "--flags")) {
161 filter &= ~DO_NONFLAGS;
162 continue;
163 }
164 if (!strcmp(arg, "--no-flags")) {
165 filter &= ~DO_FLAGS;
166 continue;
167 }
168 if (!strcmp(arg, "--verify")) {
169 filter &= ~(DO_FLAGS|DO_NOREV);
170 verify = 1;
171 continue;
172 }
173 if (!strcmp(arg, "--sq")) {
174 output_sq = 1;
175 continue;
176 }
177 if (!strcmp(arg, "--not")) {
178 show_type ^= REVERSED;
179 continue;
180 }
181 if (!strcmp(arg, "--symbolic")) {
182 symbolic = 1;
183 continue;
184 }
185 if (!strcmp(arg, "--all")) {
186 for_each_ref(show_reference);
187 continue;
188 }
189 if (!strcmp(arg, "--show-prefix")) {
190 if (prefix)
191 puts(prefix);
192 continue;
193 }
194 if (verify)
195 die("Needed a single revision");
196 show_flag(arg);
197 continue;
198 }
199 /* Not a flag argument */
201 dotdot = strstr(arg, "..");
202 if (dotdot) {
203 unsigned char end[20];
204 char *n = dotdot+2;
205 *dotdot = 0;
206 if (!get_sha1(arg, sha1)) {
207 if (!*n)
208 n = "HEAD";
209 if (!get_sha1(n, end)) {
210 show_rev(NORMAL, end, n);
211 show_rev(REVERSED, sha1, arg);
212 continue;
213 }
214 }
215 *dotdot = '.';
216 }
217 if (!get_sha1(arg, sha1)) {
218 show_rev(NORMAL, sha1, arg);
219 continue;
220 }
221 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
222 show_rev(REVERSED, sha1, arg+1);
223 continue;
224 }
225 if (verify)
226 die("Needed a single revision");
227 if ((filter & (DO_NONFLAGS|DO_NOREV)) ==
228 (DO_NONFLAGS|DO_NOREV))
229 show(arg);
230 }
231 show_default();
232 if (verify && revs_count != 1)
233 die("Needed a single revision");
234 return 0;
235}