Merge branch 'nd/fetch-into-shallow' into maint
[git] / mailmap.c
1 #include "cache.h"
2 #include "string-list.h"
3 #include "mailmap.h"
4
5 #define DEBUG_MAILMAP 0
6 #if DEBUG_MAILMAP
7 #define debug_mm(...) fprintf(stderr, __VA_ARGS__)
8 #define debug_str(X) ((X) ? (X) : "(none)")
9 #else
10 static inline void debug_mm(const char *format, ...) {}
11 static inline const char *debug_str(const char *s) { return s; }
12 #endif
13
14 const char *git_mailmap_file;
15 const char *git_mailmap_blob;
16
17 struct mailmap_info {
18         char *name;
19         char *email;
20 };
21
22 struct mailmap_entry {
23         /* name and email for the simple mail-only case */
24         char *name;
25         char *email;
26
27         /* name and email for the complex mail and name matching case */
28         struct string_list namemap;
29 };
30
31 static void free_mailmap_info(void *p, const char *s)
32 {
33         struct mailmap_info *mi = (struct mailmap_info *)p;
34         debug_mm("mailmap: -- complex: '%s' -> '%s' <%s>\n",
35                  s, debug_str(mi->name), debug_str(mi->email));
36         free(mi->name);
37         free(mi->email);
38 }
39
40 static void free_mailmap_entry(void *p, const char *s)
41 {
42         struct mailmap_entry *me = (struct mailmap_entry *)p;
43         debug_mm("mailmap: removing entries for <%s>, with %d sub-entries\n",
44                  s, me->namemap.nr);
45         debug_mm("mailmap: - simple: '%s' <%s>\n",
46                  debug_str(me->name), debug_str(me->email));
47
48         free(me->name);
49         free(me->email);
50
51         me->namemap.strdup_strings = 1;
52         string_list_clear_func(&me->namemap, free_mailmap_info);
53 }
54
55 static void add_mapping(struct string_list *map,
56                         char *new_name, char *new_email,
57                         char *old_name, char *old_email)
58 {
59         struct mailmap_entry *me;
60         int index;
61
62         if (old_email == NULL) {
63                 old_email = new_email;
64                 new_email = NULL;
65         }
66
67         if ((index = string_list_find_insert_index(map, old_email, 1)) < 0) {
68                 /* mailmap entry exists, invert index value */
69                 index = -1 - index;
70                 me = (struct mailmap_entry *)map->items[index].util;
71         } else {
72                 /* create mailmap entry */
73                 struct string_list_item *item;
74
75                 item = string_list_insert_at_index(map, index, old_email);
76                 me = xcalloc(1, sizeof(struct mailmap_entry));
77                 me->namemap.strdup_strings = 1;
78                 me->namemap.cmp = strcasecmp;
79                 item->util = me;
80         }
81
82         if (old_name == NULL) {
83                 debug_mm("mailmap: adding (simple) entry for %s at index %d\n",
84                          old_email, index);
85                 /* Replace current name and new email for simple entry */
86                 if (new_name) {
87                         free(me->name);
88                         me->name = xstrdup(new_name);
89                 }
90                 if (new_email) {
91                         free(me->email);
92                         me->email = xstrdup(new_email);
93                 }
94         } else {
95                 struct mailmap_info *mi = xcalloc(1, sizeof(struct mailmap_info));
96                 debug_mm("mailmap: adding (complex) entry for %s at index %d\n",
97                          old_email, index);
98                 if (new_name)
99                         mi->name = xstrdup(new_name);
100                 if (new_email)
101                         mi->email = xstrdup(new_email);
102                 string_list_insert(&me->namemap, old_name)->util = mi;
103         }
104
105         debug_mm("mailmap:  '%s' <%s> -> '%s' <%s>\n",
106                  debug_str(old_name), old_email,
107                  debug_str(new_name), debug_str(new_email));
108 }
109
110 static char *parse_name_and_email(char *buffer, char **name,
111                                   char **email, int allow_empty_email)
112 {
113         char *left, *right, *nstart, *nend;
114         *name = *email = NULL;
115
116         if ((left = strchr(buffer, '<')) == NULL)
117                 return NULL;
118         if ((right = strchr(left+1, '>')) == NULL)
119                 return NULL;
120         if (!allow_empty_email && (left+1 == right))
121                 return NULL;
122
123         /* remove whitespace from beginning and end of name */
124         nstart = buffer;
125         while (isspace(*nstart) && nstart < left)
126                 ++nstart;
127         nend = left-1;
128         while (nend > nstart && isspace(*nend))
129                 --nend;
130
131         *name = (nstart <= nend ? nstart : NULL);
132         *email = left+1;
133         *(nend+1) = '\0';
134         *right++ = '\0';
135
136         return (*right == '\0' ? NULL : right);
137 }
138
139 static void read_mailmap_line(struct string_list *map, char *buffer,
140                               char **repo_abbrev)
141 {
142         char *name1 = NULL, *email1 = NULL, *name2 = NULL, *email2 = NULL;
143         if (buffer[0] == '#') {
144                 static const char abbrev[] = "# repo-abbrev:";
145                 int abblen = sizeof(abbrev) - 1;
146                 int len = strlen(buffer);
147
148                 if (!repo_abbrev)
149                         return;
150
151                 if (len && buffer[len - 1] == '\n')
152                         buffer[--len] = 0;
153                 if (!strncmp(buffer, abbrev, abblen)) {
154                         char *cp;
155
156                         if (repo_abbrev)
157                                 free(*repo_abbrev);
158                         *repo_abbrev = xmalloc(len);
159
160                         for (cp = buffer + abblen; isspace(*cp); cp++)
161                                 ; /* nothing */
162                         strcpy(*repo_abbrev, cp);
163                 }
164                 return;
165         }
166         if ((name2 = parse_name_and_email(buffer, &name1, &email1, 0)) != NULL)
167                 parse_name_and_email(name2, &name2, &email2, 1);
168
169         if (email1)
170                 add_mapping(map, name1, email1, name2, email2);
171 }
172
173 static int read_mailmap_file(struct string_list *map, const char *filename,
174                              char **repo_abbrev)
175 {
176         char buffer[1024];
177         FILE *f;
178
179         if (!filename)
180                 return 0;
181
182         f = fopen(filename, "r");
183         if (!f) {
184                 if (errno == ENOENT)
185                         return 0;
186                 return error("unable to open mailmap at %s: %s",
187                              filename, strerror(errno));
188         }
189
190         while (fgets(buffer, sizeof(buffer), f) != NULL)
191                 read_mailmap_line(map, buffer, repo_abbrev);
192         fclose(f);
193         return 0;
194 }
195
196 static void read_mailmap_string(struct string_list *map, char *buf,
197                                 char **repo_abbrev)
198 {
199         while (*buf) {
200                 char *end = strchrnul(buf, '\n');
201
202                 if (*end)
203                         *end++ = '\0';
204
205                 read_mailmap_line(map, buf, repo_abbrev);
206                 buf = end;
207         }
208 }
209
210 static int read_mailmap_blob(struct string_list *map,
211                              const char *name,
212                              char **repo_abbrev)
213 {
214         unsigned char sha1[20];
215         char *buf;
216         unsigned long size;
217         enum object_type type;
218
219         if (!name)
220                 return 0;
221         if (get_sha1(name, sha1) < 0)
222                 return 0;
223
224         buf = read_sha1_file(sha1, &type, &size);
225         if (!buf)
226                 return error("unable to read mailmap object at %s", name);
227         if (type != OBJ_BLOB)
228                 return error("mailmap is not a blob: %s", name);
229
230         read_mailmap_string(map, buf, repo_abbrev);
231
232         free(buf);
233         return 0;
234 }
235
236 int read_mailmap(struct string_list *map, char **repo_abbrev)
237 {
238         int err = 0;
239
240         map->strdup_strings = 1;
241         map->cmp = strcasecmp;
242
243         if (!git_mailmap_blob && is_bare_repository())
244                 git_mailmap_blob = "HEAD:.mailmap";
245
246         err |= read_mailmap_file(map, ".mailmap", repo_abbrev);
247         err |= read_mailmap_blob(map, git_mailmap_blob, repo_abbrev);
248         err |= read_mailmap_file(map, git_mailmap_file, repo_abbrev);
249         return err;
250 }
251
252 void clear_mailmap(struct string_list *map)
253 {
254         debug_mm("mailmap: clearing %d entries...\n", map->nr);
255         map->strdup_strings = 1;
256         string_list_clear_func(map, free_mailmap_entry);
257         debug_mm("mailmap: cleared\n");
258 }
259
260 /*
261  * Look for an entry in map that match string[0:len]; string[len]
262  * does not have to be NUL (but it could be).
263  */
264 static struct string_list_item *lookup_prefix(struct string_list *map,
265                                               const char *string, size_t len)
266 {
267         int i = string_list_find_insert_index(map, string, 1);
268         if (i < 0) {
269                 /* exact match */
270                 i = -1 - i;
271                 if (!string[len])
272                         return &map->items[i];
273                 /*
274                  * that map entry matches exactly to the string, including
275                  * the cruft at the end beyond "len".  That is not a match
276                  * with string[0:len] that we are looking for.
277                  */
278         } else if (!string[len]) {
279                 /*
280                  * asked with the whole string, and got nothing.  No
281                  * matching entry can exist in the map.
282                  */
283                 return NULL;
284         }
285
286         /*
287          * i is at the exact match to an overlong key, or location the
288          * overlong key would be inserted, which must come after the
289          * real location of the key if one exists.
290          */
291         while (0 <= --i && i < map->nr) {
292                 int cmp = strncasecmp(map->items[i].string, string, len);
293                 if (cmp < 0)
294                         /*
295                          * "i" points at a key definitely below the prefix;
296                          * the map does not have string[0:len] in it.
297                          */
298                         break;
299                 else if (!cmp && !map->items[i].string[len])
300                         /* found it */
301                         return &map->items[i];
302                 /*
303                  * otherwise, the string at "i" may be string[0:len]
304                  * followed by a string that sorts later than string[len:];
305                  * keep trying.
306                  */
307         }
308         return NULL;
309 }
310
311 int map_user(struct string_list *map,
312              const char **email, size_t *emaillen,
313              const char **name, size_t *namelen)
314 {
315         struct string_list_item *item;
316         struct mailmap_entry *me;
317
318         debug_mm("map_user: map '%.*s' <%.*s>\n",
319                  (int)*namelen, debug_str(*name),
320                  (int)*emaillen, debug_str(*email));
321
322         item = lookup_prefix(map, *email, *emaillen);
323         if (item != NULL) {
324                 me = (struct mailmap_entry *)item->util;
325                 if (me->namemap.nr) {
326                         /*
327                          * The item has multiple items, so we'll look up on
328                          * name too. If the name is not found, we choose the
329                          * simple entry.
330                          */
331                         struct string_list_item *subitem;
332                         subitem = lookup_prefix(&me->namemap, *name, *namelen);
333                         if (subitem)
334                                 item = subitem;
335                 }
336         }
337         if (item != NULL) {
338                 struct mailmap_info *mi = (struct mailmap_info *)item->util;
339                 if (mi->name == NULL && mi->email == NULL) {
340                         debug_mm("map_user:  -- (no simple mapping)\n");
341                         return 0;
342                 }
343                 if (mi->email) {
344                                 *email = mi->email;
345                                 *emaillen = strlen(*email);
346                 }
347                 if (mi->name) {
348                                 *name = mi->name;
349                                 *namelen = strlen(*name);
350                 }
351                 debug_mm("map_user:  to '%.*s' <%.*s>\n",
352                          (int)*namelen, debug_str(*name),
353                          (int)*emaillen, debug_str(*email));
354                 return 1;
355         }
356         debug_mm("map_user:  --\n");
357         return 0;
358 }