ls-tree.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 static int line_termination = '\n';
   9 static int recursive = 0;
  10
  11 struct path_prefix {
  12         struct path_prefix *prev;
  13         const char *name;
  14 };
  15
  16 #define DEBUG(fmt, ...)
  17
  18 static int string_path_prefix(char *buff, size_t blen, struct path_prefix *prefix)
  19 {
  20         int len = 0;
  21         if (prefix) {
  22                 if (prefix->prev) {
  23                         len = string_path_prefix(buff,blen,prefix->prev);
  24                         buff += len;
  25                         blen -= len;
  26                         if (blen > 0) {
  27                                 *buff = '/';
  28                                 len++;
  29                                 buff++;
  30                                 blen--;
  31                         }
  32                 }
  33                 strncpy(buff,prefix->name,blen);
  34                 return len + strlen(prefix->name);
  35         }
  36
  37         return 0;
  38 }
  39
  40 static void print_path_prefix(struct path_prefix *prefix)
  41 {
  42         if (prefix) {
  43                 if (prefix->prev) {
  44                         print_path_prefix(prefix->prev);
  45                         putchar('/');
  46                 }
  47                 fputs(prefix->name, stdout);
  48         }
  49 }
  50
  51 /*
  52  * return:
  53  *      -1 if prefix is *not* a subset of path
  54  *       0 if prefix == path
  55  *       1 if prefix is a subset of path
  56  */
  57 static int pathcmp(const char *path, struct path_prefix *prefix)
  58 {
  59         char buff[PATH_MAX];
  60         int len,slen;
  61
  62         if (prefix == NULL)
  63                 return 1;
  64
  65         len = string_path_prefix(buff, sizeof buff, prefix);
  66         slen = strlen(path);
  67
  68         if (slen < len)
  69                 return -1;
  70
  71         if (strncmp(path,buff,len) == 0) {
  72                 if (slen == len)
  73                         return 0;
  74                 else
  75                         return 1;
  76         }
  77
  78         return -1;
  79 }
  80
  81 /*
  82  * match may be NULL, or a *sorted* list of paths
  83  */
  84 static void list_recursive(void *buffer,
  85                            const char *type,
  86                            unsigned long size,
  87                            struct path_prefix *prefix,
  88                            char **match, int matches)
  89 {
  90         struct path_prefix this_prefix;
  91         this_prefix.prev = prefix;
  92
  93         if (strcmp(type, "tree"))
  94                 die("expected a 'tree' node");
  95
  96         if (matches)
  97                 recursive = 1;
  98
  99         while (size) {
 100                 int namelen = strlen(buffer)+1;
 101                 void *eltbuf = NULL;
 102                 char elttype[20];
 103                 unsigned long eltsize;
 104                 unsigned char *sha1 = buffer + namelen;
 105                 char *path = strchr(buffer, ' ') + 1;
 106                 unsigned int mode;
 107                 const char *matched = NULL;
 108                 int mtype = -1;
 109                 int mindex;
 110
 111                 if (size < namelen + 20 || sscanf(buffer, "%o", &mode) != 1)
 112                         die("corrupt 'tree' file");
 113                 buffer = sha1 + 20;
 114                 size -= namelen + 20;
 115
 116                 this_prefix.name = path;
 117                 for ( mindex = 0; mindex < matches; mindex++) {
 118                         mtype = pathcmp(match[mindex],&this_prefix);
 119                         if (mtype >= 0) {
 120                                 matched = match[mindex];
 121                                 break;
 122                         }
 123                 }
 124
 125                 /*
 126                  * If we're not matching, or if this is an exact match,
 127                  * print out the info
 128                  */
 129                 if (!matches || (matched != NULL && mtype == 0)) {
 130                         printf("%06o %s %s\t", mode,
 131                                S_ISDIR(mode) ? "tree" : "blob",
 132                                sha1_to_hex(sha1));
 133                         print_path_prefix(&this_prefix);
 134                         putchar(line_termination);
 135                 }
 136
 137                 if (! recursive || ! S_ISDIR(mode))
 138                         continue;
 139
 140                 if (matches && ! matched)
 141                         continue;
 142
 143                 if (! (eltbuf = read_sha1_file(sha1, elttype, &eltsize)) ) {
 144                         error("cannot read %s", sha1_to_hex(sha1));
 145                         continue;
 146                 }
 147
 148                 /* If this is an exact directory match, we may have
 149                  * directory files following this path. Match on them.
 150                  * Otherwise, we're at a pach subcomponent, and we need
 151                  * to try to match again.
 152                  */
 153                 if (mtype == 0)
 154                         mindex++;
 155
 156                 list_recursive(eltbuf, elttype, eltsize, &this_prefix, &match[mindex], matches-mindex);
 157                 free(eltbuf);
 158         }
 159 }
 160
 161 static int qcmp(const void *a, const void *b)
 162 {
 163         return strcmp(*(char **)a, *(char **)b);
 164 }
 165
 166 static int list(unsigned char *sha1,char **path)
 167 {
 168         void *buffer;
 169         unsigned long size;
 170         int npaths;
 171
 172         for (npaths = 0; path[npaths] != NULL; npaths++)
 173                 ;
 174
 175         qsort(path,npaths,sizeof(char *),qcmp);
 176
 177         buffer = read_object_with_reference(sha1, "tree", &size, NULL);
 178         if (!buffer)
 179                 die("unable to read sha1 file");
 180         list_recursive(buffer, "tree", size, NULL, path, npaths);
 181         free(buffer);
 182         return 0;
 183 }
 184
 185 static const char *ls_tree_usage = "git-ls-tree [-r] [-z] <key> [paths...]";
 186
 187 int main(int argc, char **argv)
 188 {
 189         unsigned char sha1[20];
 190
 191         while (1 < argc && argv[1][0] == '-') {
 192                 switch (argv[1][1]) {
 193                 case 'z':
 194                         line_termination = 0;
 195                         break;
 196                 case 'r':
 197                         recursive = 1;
 198                         break;
 199                 default:
 200                         usage(ls_tree_usage);
 201                 }
 202                 argc--; argv++;
 203         }
 204
 205         if (argc < 2)
 206                 usage(ls_tree_usage);
 207         if (get_sha1(argv[1], sha1) < 0)
 208                 usage(ls_tree_usage);
 209         if (list(sha1, &argv[2]) < 0)
 210                 die("list failed");
 211         return 0;
 212 }