Andrew's git - gitweb.git/blob

   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
   9static void flush_buffer(const char *buf, unsigned long size)
  10{
  11        while (size > 0) {
  12                long ret = xwrite(1, buf, size);
  13                if (ret < 0) {
  14                        /* Ignore epipe */
  15                        if (errno == EPIPE)
  16                                break;
  17                        die("git-cat-file: %s", strerror(errno));
  18                } else if (!ret) {
  19                        die("git-cat-file: disk full?");
  20                }
  21                size -= ret;
  22                buf += ret;
  23        }
  24}
  25
  26static int pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
  27{
  28        /* the parser in tag.c is useless here. */
  29        const char *endp = buf + size;
  30        const char *cp = buf;
  31
  32        while (cp < endp) {
  33                char c = *cp++;
  34                if (c != '\n')
  35                        continue;
  36                if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
  37                        const char *tagger = cp;
  38
  39                        /* Found the tagger line.  Copy out the contents
  40                         * of the buffer so far.
  41                         */
  42                        flush_buffer(buf, cp - buf);
  43
  44                        /*
  45                         * Do something intelligent, like pretty-printing
  46                         * the date.
  47                         */
  48                        while (cp < endp) {
  49                                if (*cp++ == '\n') {
  50                                        /* tagger to cp is a line
  51                                         * that has ident and time.
  52                                         */
  53                                        const char *sp = tagger;
  54                                        char *ep;
  55                                        unsigned long date;
  56                                        long tz;
  57                                        while (sp < cp && *sp != '>')
  58                                                sp++;
  59                                        if (sp == cp) {
  60                                                /* give up */
  61                                                flush_buffer(tagger,
  62                                                             cp - tagger);
  63                                                break;
  64                                        }
  65                                        while (sp < cp &&
  66                                               !('0' <= *sp && *sp <= '9'))
  67                                                sp++;
  68                                        flush_buffer(tagger, sp - tagger);
  69                                        date = strtoul(sp, &ep, 10);
  70                                        tz = strtol(ep, NULL, 10);
  71                                        sp = show_date(date, tz);
  72                                        flush_buffer(sp, strlen(sp));
  73                                        xwrite(1, "\n", 1);
  74                                        break;
  75                                }
  76                        }
  77                        break;
  78                }
  79                if (cp < endp && *cp == '\n')
  80                        /* end of header */
  81                        break;
  82        }
  83        /* At this point, we have copied out the header up to the end of
  84         * the tagger line and cp points at one past \n.  It could be the
  85         * next header line after the tagger line, or it could be another
  86         * \n that marks the end of the headers.  We need to copy out the
  87         * remainder as is.
  88         */
  89        if (cp < endp)
  90                flush_buffer(cp, endp - cp);
  91        return 0;
  92}
  93
  94int main(int argc, char **argv)
  95{
  96        unsigned char sha1[20];
  97        char type[20];
  98        void *buf;
  99        unsigned long size;
 100        int opt;
 101
 102        setup_git_directory();
 103        git_config(git_default_config);
 104        if (argc != 3 || get_sha1(argv[2], sha1))
 105                usage("git-cat-file [-t|-s|-e|-p|<type>] <sha1>");
 106
 107        opt = 0;
 108        if ( argv[1][0] == '-' ) {
 109                opt = argv[1][1];
 110                if ( !opt || argv[1][2] )
 111                        opt = -1; /* Not a single character option */
 112        }
 113
 114        buf = NULL;
 115        switch (opt) {
 116        case 't':
 117                if (!sha1_object_info(sha1, type, NULL)) {
 118                        printf("%s\n", type);
 119                        return 0;
 120                }
 121                break;
 122
 123        case 's':
 124                if (!sha1_object_info(sha1, type, &size)) {
 125                        printf("%lu\n", size);
 126                        return 0;
 127                }
 128                break;
 129
 130        case 'e':
 131                return !has_sha1_file(sha1);
 132
 133        case 'p':
 134                if (get_sha1(argv[2], sha1) ||
 135                    sha1_object_info(sha1, type, NULL))
 136                        die("Not a valid object name %s", argv[2]);
 137
 138                /* custom pretty-print here */
 139                if (!strcmp(type, "tree"))
 140                        return execl_git_cmd("ls-tree", argv[2], NULL);
 141
 142                buf = read_sha1_file(sha1, type, &size);
 143                if (!buf)
 144                        die("Cannot read object %s", argv[2]);
 145                if (!strcmp(type, "tag"))
 146                        return pprint_tag(sha1, buf, size);
 147
 148                /* otherwise just spit out the data */
 149                break;
 150        case 0:
 151                buf = read_object_with_reference(sha1, argv[1], &size, NULL);
 152                break;
 153
 154        default:
 155                die("git-cat-file: unknown option: %s\n", argv[1]);
 156        }
 157
 158        if (!buf)
 159                die("git-cat-file %s: bad file", argv[2]);
 160
 161        flush_buffer(buf, size);
 162        return 0;
 163}