mailmap.c

   1 #include "cache.h"
   2 #include "string-list.h"
   3 #include "mailmap.h"
   4 #include "object-store.h"
   5
   6 #define DEBUG_MAILMAP 0
   7 #if DEBUG_MAILMAP
   8 #define debug_mm(...) fprintf(stderr, __VA_ARGS__)
   9 #define debug_str(X) ((X) ? (X) : "(none)")
  10 #else
  11 static inline void debug_mm(const char *format, ...) {}
  12 static inline const char *debug_str(const char *s) { return s; }
  13 #endif
  14
  15 const char *git_mailmap_file;
  16 const char *git_mailmap_blob;
  17
  18 struct mailmap_info {
  19         char *name;
  20         char *email;
  21 };
  22
  23 struct mailmap_entry {
  24         /* name and email for the simple mail-only case */
  25         char *name;
  26         char *email;
  27
  28         /* name and email for the complex mail and name matching case */
  29         struct string_list namemap;
  30 };
  31
  32 static void free_mailmap_info(void *p, const char *s)
  33 {
  34         struct mailmap_info *mi = (struct mailmap_info *)p;
  35         debug_mm("mailmap: -- complex: '%s' -> '%s' <%s>\n",
  36                  s, debug_str(mi->name), debug_str(mi->email));
  37         free(mi->name);
  38         free(mi->email);
  39 }
  40
  41 static void free_mailmap_entry(void *p, const char *s)
  42 {
  43         struct mailmap_entry *me = (struct mailmap_entry *)p;
  44         debug_mm("mailmap: removing entries for <%s>, with %d sub-entries\n",
  45                  s, me->namemap.nr);
  46         debug_mm("mailmap: - simple: '%s' <%s>\n",
  47                  debug_str(me->name), debug_str(me->email));
  48
  49         free(me->name);
  50         free(me->email);
  51
  52         me->namemap.strdup_strings = 1;
  53         string_list_clear_func(&me->namemap, free_mailmap_info);
  54 }
  55
  56 /*
  57  * On some systems (e.g. MinGW 4.0), string.h has _only_ inline
  58  * definition of strcasecmp and no non-inline implementation is
  59  * supplied anywhere, which is, eh, "unusual"; we cannot take an
  60  * address of such a function to store it in namemap.cmp.  This is
  61  * here as a workaround---do not assign strcasecmp directly to
  62  * namemap.cmp until we know no systems that matter have such an
  63  * "unusual" string.h.
  64  */
  65 static int namemap_cmp(const char *a, const char *b)
  66 {
  67         return strcasecmp(a, b);
  68 }
  69
  70 static void add_mapping(struct string_list *map,
  71                         char *new_name, char *new_email,
  72                         char *old_name, char *old_email)
  73 {
  74         struct mailmap_entry *me;
  75         struct string_list_item *item;
  76
  77         if (old_email == NULL) {
  78                 old_email = new_email;
  79                 new_email = NULL;
  80         }
  81
  82         item = string_list_insert(map, old_email);
  83         if (item->util) {
  84                 me = (struct mailmap_entry *)item->util;
  85         } else {
  86                 CALLOC_ARRAY(me, 1);
  87                 me->namemap.strdup_strings = 1;
  88                 me->namemap.cmp = namemap_cmp;
  89                 item->util = me;
  90         }
  91
  92         if (old_name == NULL) {
  93                 debug_mm("mailmap: adding (simple) entry for '%s'\n", old_email);
  94
  95                 /* Replace current name and new email for simple entry */
  96                 if (new_name) {
  97                         free(me->name);
  98                         me->name = xstrdup(new_name);
  99                 }
 100                 if (new_email) {
 101                         free(me->email);
 102                         me->email = xstrdup(new_email);
 103                 }
 104         } else {
 105                 struct mailmap_info *mi = xcalloc(1, sizeof(struct mailmap_info));
 106                 debug_mm("mailmap: adding (complex) entry for '%s'\n", old_email);
 107                 mi->name = xstrdup_or_null(new_name);
 108                 mi->email = xstrdup_or_null(new_email);
 109                 string_list_insert(&me->namemap, old_name)->util = mi;
 110         }
 111
 112         debug_mm("mailmap:  '%s' <%s> -> '%s' <%s>\n",
 113                  debug_str(old_name), old_email,
 114                  debug_str(new_name), debug_str(new_email));
 115 }
 116
 117 static char *parse_name_and_email(char *buffer, char **name,
 118                                   char **email, int allow_empty_email)
 119 {
 120         char *left, *right, *nstart, *nend;
 121         *name = *email = NULL;
 122
 123         if ((left = strchr(buffer, '<')) == NULL)
 124                 return NULL;
 125         if ((right = strchr(left+1, '>')) == NULL)
 126                 return NULL;
 127         if (!allow_empty_email && (left+1 == right))
 128                 return NULL;
 129
 130         /* remove whitespace from beginning and end of name */
 131         nstart = buffer;
 132         while (isspace(*nstart) && nstart < left)
 133                 ++nstart;
 134         nend = left-1;
 135         while (nend > nstart && isspace(*nend))
 136                 --nend;
 137
 138         *name = (nstart <= nend ? nstart : NULL);
 139         *email = left+1;
 140         *(nend+1) = '\0';
 141         *right++ = '\0';
 142
 143         return (*right == '\0' ? NULL : right);
 144 }
 145
 146 static void read_mailmap_line(struct string_list *map, char *buffer)
 147 {
 148         char *name1 = NULL, *email1 = NULL, *name2 = NULL, *email2 = NULL;
 149
 150         if (buffer[0] == '#')
 151                 return;
 152
 153         if ((name2 = parse_name_and_email(buffer, &name1, &email1, 0)) != NULL)
 154                 parse_name_and_email(name2, &name2, &email2, 1);
 155
 156         if (email1)
 157                 add_mapping(map, name1, email1, name2, email2);
 158 }
 159
 160 /* Flags for read_mailmap_file() */
 161 #define MAILMAP_NOFOLLOW (1<<0)
 162
 163 static int read_mailmap_file(struct string_list *map, const char *filename,
 164                              unsigned flags)
 165 {
 166         char buffer[1024];
 167         FILE *f;
 168         int fd;
 169
 170         if (!filename)
 171                 return 0;
 172
 173         if (flags & MAILMAP_NOFOLLOW)
 174                 fd = open_nofollow(filename, O_RDONLY);
 175         else
 176                 fd = open(filename, O_RDONLY);
 177
 178         if (fd < 0) {
 179                 if (errno == ENOENT)
 180                         return 0;
 181                 return error_errno("unable to open mailmap at %s", filename);
 182         }
 183         f = xfdopen(fd, "r");
 184
 185         while (fgets(buffer, sizeof(buffer), f) != NULL)
 186                 read_mailmap_line(map, buffer);
 187         fclose(f);
 188         return 0;
 189 }
 190
 191 static void read_mailmap_string(struct string_list *map, char *buf)
 192 {
 193         while (*buf) {
 194                 char *end = strchrnul(buf, '\n');
 195
 196                 if (*end)
 197                         *end++ = '\0';
 198
 199                 read_mailmap_line(map, buf);
 200                 buf = end;
 201         }
 202 }
 203
 204 static int read_mailmap_blob(struct string_list *map, const char *name)
 205 {
 206         struct object_id oid;
 207         char *buf;
 208         unsigned long size;
 209         enum object_type type;
 210
 211         if (!name)
 212                 return 0;
 213         if (get_oid(name, &oid) < 0)
 214                 return 0;
 215
 216         buf = read_object_file(&oid, &type, &size);
 217         if (!buf)
 218                 return error("unable to read mailmap object at %s", name);
 219         if (type != OBJ_BLOB)
 220                 return error("mailmap is not a blob: %s", name);
 221
 222         read_mailmap_string(map, buf);
 223
 224         free(buf);
 225         return 0;
 226 }
 227
 228 int read_mailmap(struct string_list *map)
 229 {
 230         int err = 0;
 231
 232         map->strdup_strings = 1;
 233         map->cmp = namemap_cmp;
 234
 235         if (!git_mailmap_blob && is_bare_repository())
 236                 git_mailmap_blob = "HEAD:.mailmap";
 237
 238         if (!startup_info->have_repository || !is_bare_repository())
 239                 err |= read_mailmap_file(map, ".mailmap",
 240                                          startup_info->have_repository ?
 241                                          MAILMAP_NOFOLLOW : 0);
 242         if (startup_info->have_repository)
 243                 err |= read_mailmap_blob(map, git_mailmap_blob);
 244         err |= read_mailmap_file(map, git_mailmap_file, 0);
 245         return err;
 246 }
 247
 248 void clear_mailmap(struct string_list *map)
 249 {
 250         debug_mm("mailmap: clearing %d entries...\n", map->nr);
 251         map->strdup_strings = 1;
 252         string_list_clear_func(map, free_mailmap_entry);
 253         debug_mm("mailmap: cleared\n");
 254 }
 255
 256 /*
 257  * Look for an entry in map that match string[0:len]; string[len]
 258  * does not have to be NUL (but it could be).
 259  */
 260 static struct string_list_item *lookup_prefix(struct string_list *map,
 261                                               const char *string, size_t len)
 262 {
 263         int i = string_list_find_insert_index(map, string, 1);
 264         if (i < 0) {
 265                 /* exact match */
 266                 i = -1 - i;
 267                 if (!string[len])
 268                         return &map->items[i];
 269                 /*
 270                  * that map entry matches exactly to the string, including
 271                  * the cruft at the end beyond "len".  That is not a match
 272                  * with string[0:len] that we are looking for.
 273                  */
 274         } else if (!string[len]) {
 275                 /*
 276                  * asked with the whole string, and got nothing.  No
 277                  * matching entry can exist in the map.
 278                  */
 279                 return NULL;
 280         }
 281
 282         /*
 283          * i is at the exact match to an overlong key, or location the
 284          * overlong key would be inserted, which must come after the
 285          * real location of the key if one exists.
 286          */
 287         while (0 <= --i && i < map->nr) {
 288                 int cmp = strncasecmp(map->items[i].string, string, len);
 289                 if (cmp < 0)
 290                         /*
 291                          * "i" points at a key definitely below the prefix;
 292                          * the map does not have string[0:len] in it.
 293                          */
 294                         break;
 295                 else if (!cmp && !map->items[i].string[len])
 296                         /* found it */
 297                         return &map->items[i];
 298                 /*
 299                  * otherwise, the string at "i" may be string[0:len]
 300                  * followed by a string that sorts later than string[len:];
 301                  * keep trying.
 302                  */
 303         }
 304         return NULL;
 305 }
 306
 307 int map_user(struct string_list *map,
 308              const char **email, size_t *emaillen,
 309              const char **name, size_t *namelen)
 310 {
 311         struct string_list_item *item;
 312         struct mailmap_entry *me;
 313
 314         debug_mm("map_user: map '%.*s' <%.*s>\n",
 315                  (int)*namelen, debug_str(*name),
 316                  (int)*emaillen, debug_str(*email));
 317
 318         item = lookup_prefix(map, *email, *emaillen);
 319         if (item != NULL) {
 320                 me = (struct mailmap_entry *)item->util;
 321                 if (me->namemap.nr) {
 322                         /*
 323                          * The item has multiple items, so we'll look up on
 324                          * name too. If the name is not found, we choose the
 325                          * simple entry.
 326                          */
 327                         struct string_list_item *subitem;
 328                         subitem = lookup_prefix(&me->namemap, *name, *namelen);
 329                         if (subitem)
 330                                 item = subitem;
 331                 }
 332         }
 333         if (item != NULL) {
 334                 struct mailmap_info *mi = (struct mailmap_info *)item->util;
 335                 if (mi->name == NULL && mi->email == NULL) {
 336                         debug_mm("map_user:  -- (no simple mapping)\n");
 337                         return 0;
 338                 }
 339                 if (mi->email) {
 340                                 *email = mi->email;
 341                                 *emaillen = strlen(*email);
 342                 }
 343                 if (mi->name) {
 344                                 *name = mi->name;
 345                                 *namelen = strlen(*name);
 346                 }
 347                 debug_mm("map_user:  to '%.*s' <%.*s>\n",
 348                          (int)*namelen, debug_str(*name),
 349                          (int)*emaillen, debug_str(*email));
 350                 return 1;
 351         }
 352         debug_mm("map_user:  --\n");
 353         return 0;
 354 }