Windows: boost startup by avoiding a static dependency on shell32.dll
[git/dscho.git] / builtin-cat-file.c
blob590684200854ad6a71653f30d494eb191fd4a324
1 /*
2  * GIT - The information manager from hell
3  *
4  * Copyright (C) Linus Torvalds, 2005
5  */
6 #include "cache.h"
7 #include "exec_cmd.h"
8 #include "tag.h"
9 #include "tree.h"
10 #include "builtin.h"
11 #include "parse-options.h"
13 #define BATCH 1
14 #define BATCH_CHECK 2
16 static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
18         /* the parser in tag.c is useless here. */
19         const char *endp = buf + size;
20         const char *cp = buf;
22         while (cp < endp) {
23                 char c = *cp++;
24                 if (c != '\n')
25                         continue;
26                 if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
27                         const char *tagger = cp;
29                         /* Found the tagger line.  Copy out the contents
30                          * of the buffer so far.
31                          */
32                         write_or_die(1, buf, cp - buf);
34                         /*
35                          * Do something intelligent, like pretty-printing
36                          * the date.
37                          */
38                         while (cp < endp) {
39                                 if (*cp++ == '\n') {
40                                         /* tagger to cp is a line
41                                          * that has ident and time.
42                                          */
43                                         const char *sp = tagger;
44                                         char *ep;
45                                         unsigned long date;
46                                         long tz;
47                                         while (sp < cp && *sp != '>')
48                                                 sp++;
49                                         if (sp == cp) {
50                                                 /* give up */
51                                                 write_or_die(1, tagger,
52                                                              cp - tagger);
53                                                 break;
54                                         }
55                                         while (sp < cp &&
56                                                !('0' <= *sp && *sp <= '9'))
57                                                 sp++;
58                                         write_or_die(1, tagger, sp - tagger);
59                                         date = strtoul(sp, &ep, 10);
60                                         tz = strtol(ep, NULL, 10);
61                                         sp = show_date(date, tz, 0);
62                                         write_or_die(1, sp, strlen(sp));
63                                         xwrite(1, "\n", 1);
64                                         break;
65                                 }
66                         }
67                         break;
68                 }
69                 if (cp < endp && *cp == '\n')
70                         /* end of header */
71                         break;
72         }
73         /* At this point, we have copied out the header up to the end of
74          * the tagger line and cp points at one past \n.  It could be the
75          * next header line after the tagger line, or it could be another
76          * \n that marks the end of the headers.  We need to copy out the
77          * remainder as is.
78          */
79         if (cp < endp)
80                 write_or_die(1, cp, endp - cp);
83 static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
85         unsigned char sha1[20];
86         enum object_type type;
87         void *buf;
88         unsigned long size;
90         if (get_sha1(obj_name, sha1))
91                 die("Not a valid object name %s", obj_name);
93         buf = NULL;
94         switch (opt) {
95         case 't':
96                 type = sha1_object_info(sha1, NULL);
97                 if (type > 0) {
98                         printf("%s\n", typename(type));
99                         return 0;
100                 }
101                 break;
103         case 's':
104                 type = sha1_object_info(sha1, &size);
105                 if (type > 0) {
106                         printf("%lu\n", size);
107                         return 0;
108                 }
109                 break;
111         case 'e':
112                 return !has_sha1_file(sha1);
114         case 'p':
115                 type = sha1_object_info(sha1, NULL);
116                 if (type < 0)
117                         die("Not a valid object name %s", obj_name);
119                 /* custom pretty-print here */
120                 if (type == OBJ_TREE) {
121                         const char *ls_args[3] = {"ls-tree", obj_name, NULL};
122                         return cmd_ls_tree(2, ls_args, NULL);
123                 }
125                 buf = read_sha1_file(sha1, &type, &size);
126                 if (!buf)
127                         die("Cannot read object %s", obj_name);
128                 if (type == OBJ_TAG) {
129                         pprint_tag(sha1, buf, size);
130                         return 0;
131                 }
133                 /* otherwise just spit out the data */
134                 break;
135         case 0:
136                 buf = read_object_with_reference(sha1, exp_type, &size, NULL);
137                 break;
139         default:
140                 die("git cat-file: unknown option: %s", exp_type);
141         }
143         if (!buf)
144                 die("git cat-file %s: bad file", obj_name);
146         write_or_die(1, buf, size);
147         return 0;
150 static int batch_one_object(const char *obj_name, int print_contents)
152         unsigned char sha1[20];
153         enum object_type type = 0;
154         unsigned long size;
155         void *contents = contents;
157         if (!obj_name)
158            return 1;
160         if (get_sha1(obj_name, sha1)) {
161                 printf("%s missing\n", obj_name);
162                 fflush(stdout);
163                 return 0;
164         }
166         if (print_contents == BATCH)
167                 contents = read_sha1_file(sha1, &type, &size);
168         else
169                 type = sha1_object_info(sha1, &size);
171         if (type <= 0) {
172                 printf("%s missing\n", obj_name);
173                 fflush(stdout);
174                 return 0;
175         }
177         printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size);
178         fflush(stdout);
180         if (print_contents == BATCH) {
181                 write_or_die(1, contents, size);
182                 printf("\n");
183                 fflush(stdout);
184                 free(contents);
185         }
187         return 0;
190 static int batch_objects(int print_contents)
192         struct strbuf buf = STRBUF_INIT;
194         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
195                 int error = batch_one_object(buf.buf, print_contents);
196                 if (error)
197                         return error;
198         }
200         return 0;
203 static const char * const cat_file_usage[] = {
204         "git cat-file (-t|-s|-e|-p|<type>) <object>",
205         "git cat-file (--batch|--batch-check) < <list_of_objects>",
206         NULL
209 int cmd_cat_file(int argc, const char **argv, const char *prefix)
211         int opt = 0, batch = 0;
212         const char *exp_type = NULL, *obj_name = NULL;
214         const struct option options[] = {
215                 OPT_GROUP("<type> can be one of: blob, tree, commit, tag"),
216                 OPT_SET_INT('t', NULL, &opt, "show object type", 't'),
217                 OPT_SET_INT('s', NULL, &opt, "show object size", 's'),
218                 OPT_SET_INT('e', NULL, &opt,
219                             "exit with zero when there's no error", 'e'),
220                 OPT_SET_INT('p', NULL, &opt, "pretty-print object's content", 'p'),
221                 OPT_SET_INT(0, "batch", &batch,
222                             "show info and content of objects feeded on stdin", BATCH),
223                 OPT_SET_INT(0, "batch-check", &batch,
224                             "show info about objects feeded on stdin",
225                             BATCH_CHECK),
226                 OPT_END()
227         };
229         git_config(git_default_config, NULL);
231         if (argc != 3 && argc != 2)
232                 usage_with_options(cat_file_usage, options);
234         argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
236         if (opt) {
237                 if (argc == 1)
238                         obj_name = argv[0];
239                 else
240                         usage_with_options(cat_file_usage, options);
241         }
242         if (!opt && !batch) {
243                 if (argc == 2) {
244                         exp_type = argv[0];
245                         obj_name = argv[1];
246                 } else
247                         usage_with_options(cat_file_usage, options);
248         }
249         if (batch && (opt || argc)) {
250                 usage_with_options(cat_file_usage, options);
251         }
253         if (batch)
254                 return batch_objects(batch);
256         return cat_one_file(opt, exp_type, obj_name);