builtin-cat-file.con commit merge-recur: do not call git-write-tree (5b982f8)
   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
  12static void flush_buffer(const char *buf, unsigned long size)
  13{
  14        while (size > 0) {
  15                long ret = xwrite(1, buf, size);
  16                if (ret < 0) {
  17                        /* Ignore epipe */
  18                        if (errno == EPIPE)
  19                                break;
  20                        die("git-cat-file: %s", strerror(errno));
  21                } else if (!ret) {
  22                        die("git-cat-file: disk full?");
  23                }
  24                size -= ret;
  25                buf += ret;
  26        }
  27}
  28
  29static int pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
  30{
  31        /* the parser in tag.c is useless here. */
  32        const char *endp = buf + size;
  33        const char *cp = buf;
  34
  35        while (cp < endp) {
  36                char c = *cp++;
  37                if (c != '\n')
  38                        continue;
  39                if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
  40                        const char *tagger = cp;
  41
  42                        /* Found the tagger line.  Copy out the contents
  43                         * of the buffer so far.
  44                         */
  45                        flush_buffer(buf, cp - buf);
  46
  47                        /*
  48                         * Do something intelligent, like pretty-printing
  49                         * the date.
  50                         */
  51                        while (cp < endp) {
  52                                if (*cp++ == '\n') {
  53                                        /* tagger to cp is a line
  54                                         * that has ident and time.
  55                                         */
  56                                        const char *sp = tagger;
  57                                        char *ep;
  58                                        unsigned long date;
  59                                        long tz;
  60                                        while (sp < cp && *sp != '>')
  61                                                sp++;
  62                                        if (sp == cp) {
  63                                                /* give up */
  64                                                flush_buffer(tagger,
  65                                                             cp - tagger);
  66                                                break;
  67                                        }
  68                                        while (sp < cp &&
  69                                               !('0' <= *sp && *sp <= '9'))
  70                                                sp++;
  71                                        flush_buffer(tagger, sp - tagger);
  72                                        date = strtoul(sp, &ep, 10);
  73                                        tz = strtol(ep, NULL, 10);
  74                                        sp = show_date(date, tz);
  75                                        flush_buffer(sp, strlen(sp));
  76                                        xwrite(1, "\n", 1);
  77                                        break;
  78                                }
  79                        }
  80                        break;
  81                }
  82                if (cp < endp && *cp == '\n')
  83                        /* end of header */
  84                        break;
  85        }
  86        /* At this point, we have copied out the header up to the end of
  87         * the tagger line and cp points at one past \n.  It could be the
  88         * next header line after the tagger line, or it could be another
  89         * \n that marks the end of the headers.  We need to copy out the
  90         * remainder as is.
  91         */
  92        if (cp < endp)
  93                flush_buffer(cp, endp - cp);
  94        return 0;
  95}
  96
  97int cmd_cat_file(int argc, const char **argv, const char *prefix)
  98{
  99        unsigned char sha1[20];
 100        char type[20];
 101        void *buf;
 102        unsigned long size;
 103        int opt;
 104
 105        git_config(git_default_config);
 106        if (argc != 3)
 107                usage("git-cat-file [-t|-s|-e|-p|<type>] <sha1>");
 108        if (get_sha1(argv[2], sha1))
 109                die("Not a valid object name %s", argv[2]);
 110
 111        opt = 0;
 112        if ( argv[1][0] == '-' ) {
 113                opt = argv[1][1];
 114                if ( !opt || argv[1][2] )
 115                        opt = -1; /* Not a single character option */
 116        }
 117
 118        buf = NULL;
 119        switch (opt) {
 120        case 't':
 121                if (!sha1_object_info(sha1, type, NULL)) {
 122                        printf("%s\n", type);
 123                        return 0;
 124                }
 125                break;
 126
 127        case 's':
 128                if (!sha1_object_info(sha1, type, &size)) {
 129                        printf("%lu\n", size);
 130                        return 0;
 131                }
 132                break;
 133
 134        case 'e':
 135                return !has_sha1_file(sha1);
 136
 137        case 'p':
 138                if (sha1_object_info(sha1, type, NULL))
 139                        die("Not a valid object name %s", argv[2]);
 140
 141                /* custom pretty-print here */
 142                if (!strcmp(type, tree_type))
 143                        return cmd_ls_tree(2, argv + 1, NULL);
 144
 145                buf = read_sha1_file(sha1, type, &size);
 146                if (!buf)
 147                        die("Cannot read object %s", argv[2]);
 148                if (!strcmp(type, tag_type))
 149                        return pprint_tag(sha1, buf, size);
 150
 151                /* otherwise just spit out the data */
 152                break;
 153        case 0:
 154                buf = read_object_with_reference(sha1, argv[1], &size, NULL);
 155                break;
 156
 157        default:
 158                die("git-cat-file: unknown option: %s\n", argv[1]);
 159        }
 160
 161        if (!buf)
 162                die("git-cat-file %s: bad file", argv[2]);
 163
 164        flush_buffer(buf, size);
 165        return 0;
 166}