Merge branch 'ld/p4-unshelve'
[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 /*
56  * On some systems (e.g. MinGW 4.0), string.h has _only_ inline
57  * definition of strcasecmp and no non-inline implementation is
58  * supplied anywhere, which is, eh, "unusual"; we cannot take an
59  * address of such a function to store it in namemap.cmp.  This is
60  * here as a workaround---do not assign strcasecmp directly to
61  * namemap.cmp until we know no systems that matter have such an
62  * "unusual" string.h.
63  */
64 static int namemap_cmp(const char *a, const char *b)
65 {
66         return strcasecmp(a, b);
67 }
68
69 static void add_mapping(struct string_list *map,
70                         char *new_name, char *new_email,
71                         char *old_name, char *old_email)
72 {
73         struct mailmap_entry *me;
74         struct string_list_item *item;
75
76         if (old_email == NULL) {
77                 old_email = new_email;
78                 new_email = NULL;
79         }
80
81         item = string_list_insert(map, old_email);
82         if (item->util) {
83                 me = (struct mailmap_entry *)item->util;
84         } else {
85                 me = xcalloc(1, sizeof(struct mailmap_entry));
86                 me->namemap.strdup_strings = 1;
87                 me->namemap.cmp = namemap_cmp;
88                 item->util = me;
89         }
90
91         if (old_name == NULL) {
92                 debug_mm("mailmap: adding (simple) entry for '%s'\n", old_email);
93
94                 /* Replace current name and new email for simple entry */
95                 if (new_name) {
96                         free(me->name);
97                         me->name = xstrdup(new_name);
98                 }
99                 if (new_email) {
100                         free(me->email);
101                         me->email = xstrdup(new_email);
102                 }
103         } else {
104                 struct mailmap_info *mi = xcalloc(1, sizeof(struct mailmap_info));
105                 debug_mm("mailmap: adding (complex) entry for '%s'\n", old_email);
106                 mi->name = xstrdup_or_null(new_name);
107                 mi->email = xstrdup_or_null(new_email);
108                 string_list_insert(&me->namemap, old_name)->util = mi;
109         }
110
111         debug_mm("mailmap:  '%s' <%s> -> '%s' <%s>\n",
112                  debug_str(old_name), old_email,
113                  debug_str(new_name), debug_str(new_email));
114 }
115
116 static char *parse_name_and_email(char *buffer, char **name,
117                                   char **email, int allow_empty_email)
118 {
119         char *left, *right, *nstart, *nend;
120         *name = *email = NULL;
121
122         if ((left = strchr(buffer, '<')) == NULL)
123                 return NULL;
124         if ((right = strchr(left+1, '>')) == NULL)
125                 return NULL;
126         if (!allow_empty_email && (left+1 == right))
127                 return NULL;
128
129         /* remove whitespace from beginning and end of name */
130         nstart = buffer;
131         while (isspace(*nstart) && nstart < left)
132                 ++nstart;
133         nend = left-1;
134         while (nend > nstart && isspace(*nend))
135                 --nend;
136
137         *name = (nstart <= nend ? nstart : NULL);
138         *email = left+1;
139         *(nend+1) = '\0';
140         *right++ = '\0';
141
142         return (*right == '\0' ? NULL : right);
143 }
144
145 static void read_mailmap_line(struct string_list *map, char *buffer,
146                               char **repo_abbrev)
147 {
148         char *name1 = NULL, *email1 = NULL, *name2 = NULL, *email2 = NULL;
149         if (buffer[0] == '#') {
150                 static const char abbrev[] = "# repo-abbrev:";
151                 int abblen = sizeof(abbrev) - 1;
152                 int len = strlen(buffer);
153
154                 if (!repo_abbrev)
155                         return;
156
157                 if (len && buffer[len - 1] == '\n')
158                         buffer[--len] = 0;
159                 if (!strncmp(buffer, abbrev, abblen)) {
160                         char *cp;
161
162                         free(*repo_abbrev);
163
164                         for (cp = buffer + abblen; isspace(*cp); cp++)
165                                 ; /* nothing */
166                         *repo_abbrev = xstrdup(cp);
167                 }
168                 return;
169         }
170         if ((name2 = parse_name_and_email(buffer, &name1, &email1, 0)) != NULL)
171                 parse_name_and_email(name2, &name2, &email2, 1);
172
173         if (email1)
174                 add_mapping(map, name1, email1, name2, email2);
175 }
176
177 static int read_mailmap_file(struct string_list *map, const char *filename,
178                              char **repo_abbrev)
179 {
180         char buffer[1024];
181         FILE *f;
182
183         if (!filename)
184                 return 0;
185
186         f = fopen(filename, "r");
187         if (!f) {
188                 if (errno == ENOENT)
189                         return 0;
190                 return error_errno("unable to open mailmap at %s", filename);
191         }
192
193         while (fgets(buffer, sizeof(buffer), f) != NULL)
194                 read_mailmap_line(map, buffer, repo_abbrev);
195         fclose(f);
196         return 0;
197 }
198
199 static void read_mailmap_string(struct string_list *map, char *buf,
200                                 char **repo_abbrev)
201 {
202         while (*buf) {
203                 char *end = strchrnul(buf, '\n');
204
205                 if (*end)
206                         *end++ = '\0';
207
208                 read_mailmap_line(map, buf, repo_abbrev);
209                 buf = end;
210         }
211 }
212
213 static int read_mailmap_blob(struct string_list *map,
214                              const char *name,
215                              char **repo_abbrev)
216 {
217         struct object_id oid;
218         char *buf;
219         unsigned long size;
220         enum object_type type;
221
222         if (!name)
223                 return 0;
224         if (get_oid(name, &oid) < 0)
225                 return 0;
226
227         buf = read_object_file(&oid, &type, &size);
228         if (!buf)
229                 return error("unable to read mailmap object at %s", name);
230         if (type != OBJ_BLOB)
231                 return error("mailmap is not a blob: %s", name);
232
233         read_mailmap_string(map, buf, repo_abbrev);
234
235         free(buf);
236         return 0;
237 }
238
239 int read_mailmap(struct string_list *map, char **repo_abbrev)
240 {
241         int err = 0;
242
243         map->strdup_strings = 1;
244         map->cmp = namemap_cmp;
245
246         if (!git_mailmap_blob && is_bare_repository())
247                 git_mailmap_blob = "HEAD:.mailmap";
248
249         err |= read_mailmap_file(map, ".mailmap", repo_abbrev);
250         if (startup_info->have_repository)
251                 err |= read_mailmap_blob(map, git_mailmap_blob, repo_abbrev);
252         err |= read_mailmap_file(map, git_mailmap_file, repo_abbrev);
253         return err;
254 }
255
256 void clear_mailmap(struct string_list *map)
257 {
258         debug_mm("mailmap: clearing %d entries...\n", map->nr);
259         map->strdup_strings = 1;
260         string_list_clear_func(map, free_mailmap_entry);
261         debug_mm("mailmap: cleared\n");
262 }
263
264 /*
265  * Look for an entry in map that match string[0:len]; string[len]
266  * does not have to be NUL (but it could be).
267  */
268 static struct string_list_item *lookup_prefix(struct string_list *map,
269                                               const char *string, size_t len)
270 {
271         int i = string_list_find_insert_index(map, string, 1);
272         if (i < 0) {
273                 /* exact match */
274                 i = -1 - i;
275                 if (!string[len])
276                         return &map->items[i];
277                 /*
278                  * that map entry matches exactly to the string, including
279                  * the cruft at the end beyond "len".  That is not a match
280                  * with string[0:len] that we are looking for.
281                  */
282         } else if (!string[len]) {
283                 /*
284                  * asked with the whole string, and got nothing.  No
285                  * matching entry can exist in the map.
286                  */
287                 return NULL;
288         }
289
290         /*
291          * i is at the exact match to an overlong key, or location the
292          * overlong key would be inserted, which must come after the
293          * real location of the key if one exists.
294          */
295         while (0 <= --i && i < map->nr) {
296                 int cmp = strncasecmp(map->items[i].string, string, len);
297                 if (cmp < 0)
298                         /*
299                          * "i" points at a key definitely below the prefix;
300                          * the map does not have string[0:len] in it.
301                          */
302                         break;
303                 else if (!cmp && !map->items[i].string[len])
304                         /* found it */
305                         return &map->items[i];
306                 /*
307                  * otherwise, the string at "i" may be string[0:len]
308                  * followed by a string that sorts later than string[len:];
309                  * keep trying.
310                  */
311         }
312         return NULL;
313 }
314
315 int map_user(struct string_list *map,
316              const char **email, size_t *emaillen,
317              const char **name, size_t *namelen)
318 {
319         struct string_list_item *item;
320         struct mailmap_entry *me;
321
322         debug_mm("map_user: map '%.*s' <%.*s>\n",
323                  (int)*namelen, debug_str(*name),
324                  (int)*emaillen, debug_str(*email));
325
326         item = lookup_prefix(map, *email, *emaillen);
327         if (item != NULL) {
328                 me = (struct mailmap_entry *)item->util;
329                 if (me->namemap.nr) {
330                         /*
331                          * The item has multiple items, so we'll look up on
332                          * name too. If the name is not found, we choose the
333                          * simple entry.
334                          */
335                         struct string_list_item *subitem;
336                         subitem = lookup_prefix(&me->namemap, *name, *namelen);
337                         if (subitem)
338                                 item = subitem;
339                 }
340         }
341         if (item != NULL) {
342                 struct mailmap_info *mi = (struct mailmap_info *)item->util;
343                 if (mi->name == NULL && mi->email == NULL) {
344                         debug_mm("map_user:  -- (no simple mapping)\n");
345                         return 0;
346                 }
347                 if (mi->email) {
348                                 *email = mi->email;
349                                 *emaillen = strlen(*email);
350                 }
351                 if (mi->name) {
352                                 *name = mi->name;
353                                 *namelen = strlen(*name);
354                 }
355                 debug_mm("map_user:  to '%.*s' <%.*s>\n",
356                          (int)*namelen, debug_str(*name),
357                          (int)*emaillen, debug_str(*email));
358                 return 1;
359         }
360         debug_mm("map_user:  --\n");
361         return 0;
362 }