Merge branch 'sb/t5614-modernize'
[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                 if (new_name)
107                         mi->name = xstrdup(new_name);
108                 if (new_email)
109                         mi->email = xstrdup(new_email);
110                 string_list_insert(&me->namemap, old_name)->util = mi;
111         }
112
113         debug_mm("mailmap:  '%s' <%s> -> '%s' <%s>\n",
114                  debug_str(old_name), old_email,
115                  debug_str(new_name), debug_str(new_email));
116 }
117
118 static char *parse_name_and_email(char *buffer, char **name,
119                                   char **email, int allow_empty_email)
120 {
121         char *left, *right, *nstart, *nend;
122         *name = *email = NULL;
123
124         if ((left = strchr(buffer, '<')) == NULL)
125                 return NULL;
126         if ((right = strchr(left+1, '>')) == NULL)
127                 return NULL;
128         if (!allow_empty_email && (left+1 == right))
129                 return NULL;
130
131         /* remove whitespace from beginning and end of name */
132         nstart = buffer;
133         while (isspace(*nstart) && nstart < left)
134                 ++nstart;
135         nend = left-1;
136         while (nend > nstart && isspace(*nend))
137                 --nend;
138
139         *name = (nstart <= nend ? nstart : NULL);
140         *email = left+1;
141         *(nend+1) = '\0';
142         *right++ = '\0';
143
144         return (*right == '\0' ? NULL : right);
145 }
146
147 static void read_mailmap_line(struct string_list *map, char *buffer,
148                               char **repo_abbrev)
149 {
150         char *name1 = NULL, *email1 = NULL, *name2 = NULL, *email2 = NULL;
151         if (buffer[0] == '#') {
152                 static const char abbrev[] = "# repo-abbrev:";
153                 int abblen = sizeof(abbrev) - 1;
154                 int len = strlen(buffer);
155
156                 if (!repo_abbrev)
157                         return;
158
159                 if (len && buffer[len - 1] == '\n')
160                         buffer[--len] = 0;
161                 if (!strncmp(buffer, abbrev, abblen)) {
162                         char *cp;
163
164                         free(*repo_abbrev);
165
166                         for (cp = buffer + abblen; isspace(*cp); cp++)
167                                 ; /* nothing */
168                         *repo_abbrev = xstrdup(cp);
169                 }
170                 return;
171         }
172         if ((name2 = parse_name_and_email(buffer, &name1, &email1, 0)) != NULL)
173                 parse_name_and_email(name2, &name2, &email2, 1);
174
175         if (email1)
176                 add_mapping(map, name1, email1, name2, email2);
177 }
178
179 static int read_mailmap_file(struct string_list *map, const char *filename,
180                              char **repo_abbrev)
181 {
182         char buffer[1024];
183         FILE *f;
184
185         if (!filename)
186                 return 0;
187
188         f = fopen(filename, "r");
189         if (!f) {
190                 if (errno == ENOENT)
191                         return 0;
192                 return error_errno("unable to open mailmap at %s", filename);
193         }
194
195         while (fgets(buffer, sizeof(buffer), f) != NULL)
196                 read_mailmap_line(map, buffer, repo_abbrev);
197         fclose(f);
198         return 0;
199 }
200
201 static void read_mailmap_string(struct string_list *map, char *buf,
202                                 char **repo_abbrev)
203 {
204         while (*buf) {
205                 char *end = strchrnul(buf, '\n');
206
207                 if (*end)
208                         *end++ = '\0';
209
210                 read_mailmap_line(map, buf, repo_abbrev);
211                 buf = end;
212         }
213 }
214
215 static int read_mailmap_blob(struct string_list *map,
216                              const char *name,
217                              char **repo_abbrev)
218 {
219         unsigned char sha1[20];
220         char *buf;
221         unsigned long size;
222         enum object_type type;
223
224         if (!name)
225                 return 0;
226         if (get_sha1(name, sha1) < 0)
227                 return 0;
228
229         buf = read_sha1_file(sha1, &type, &size);
230         if (!buf)
231                 return error("unable to read mailmap object at %s", name);
232         if (type != OBJ_BLOB)
233                 return error("mailmap is not a blob: %s", name);
234
235         read_mailmap_string(map, buf, repo_abbrev);
236
237         free(buf);
238         return 0;
239 }
240
241 int read_mailmap(struct string_list *map, char **repo_abbrev)
242 {
243         int err = 0;
244
245         map->strdup_strings = 1;
246         map->cmp = namemap_cmp;
247
248         if (!git_mailmap_blob && is_bare_repository())
249                 git_mailmap_blob = "HEAD:.mailmap";
250
251         err |= read_mailmap_file(map, ".mailmap", repo_abbrev);
252         if (startup_info->have_repository)
253                 err |= read_mailmap_blob(map, git_mailmap_blob, repo_abbrev);
254         err |= read_mailmap_file(map, git_mailmap_file, repo_abbrev);
255         return err;
256 }
257
258 void clear_mailmap(struct string_list *map)
259 {
260         debug_mm("mailmap: clearing %d entries...\n", map->nr);
261         map->strdup_strings = 1;
262         string_list_clear_func(map, free_mailmap_entry);
263         debug_mm("mailmap: cleared\n");
264 }
265
266 /*
267  * Look for an entry in map that match string[0:len]; string[len]
268  * does not have to be NUL (but it could be).
269  */
270 static struct string_list_item *lookup_prefix(struct string_list *map,
271                                               const char *string, size_t len)
272 {
273         int i = string_list_find_insert_index(map, string, 1);
274         if (i < 0) {
275                 /* exact match */
276                 i = -1 - i;
277                 if (!string[len])
278                         return &map->items[i];
279                 /*
280                  * that map entry matches exactly to the string, including
281                  * the cruft at the end beyond "len".  That is not a match
282                  * with string[0:len] that we are looking for.
283                  */
284         } else if (!string[len]) {
285                 /*
286                  * asked with the whole string, and got nothing.  No
287                  * matching entry can exist in the map.
288                  */
289                 return NULL;
290         }
291
292         /*
293          * i is at the exact match to an overlong key, or location the
294          * overlong key would be inserted, which must come after the
295          * real location of the key if one exists.
296          */
297         while (0 <= --i && i < map->nr) {
298                 int cmp = strncasecmp(map->items[i].string, string, len);
299                 if (cmp < 0)
300                         /*
301                          * "i" points at a key definitely below the prefix;
302                          * the map does not have string[0:len] in it.
303                          */
304                         break;
305                 else if (!cmp && !map->items[i].string[len])
306                         /* found it */
307                         return &map->items[i];
308                 /*
309                  * otherwise, the string at "i" may be string[0:len]
310                  * followed by a string that sorts later than string[len:];
311                  * keep trying.
312                  */
313         }
314         return NULL;
315 }
316
317 int map_user(struct string_list *map,
318              const char **email, size_t *emaillen,
319              const char **name, size_t *namelen)
320 {
321         struct string_list_item *item;
322         struct mailmap_entry *me;
323
324         debug_mm("map_user: map '%.*s' <%.*s>\n",
325                  (int)*namelen, debug_str(*name),
326                  (int)*emaillen, debug_str(*email));
327
328         item = lookup_prefix(map, *email, *emaillen);
329         if (item != NULL) {
330                 me = (struct mailmap_entry *)item->util;
331                 if (me->namemap.nr) {
332                         /*
333                          * The item has multiple items, so we'll look up on
334                          * name too. If the name is not found, we choose the
335                          * simple entry.
336                          */
337                         struct string_list_item *subitem;
338                         subitem = lookup_prefix(&me->namemap, *name, *namelen);
339                         if (subitem)
340                                 item = subitem;
341                 }
342         }
343         if (item != NULL) {
344                 struct mailmap_info *mi = (struct mailmap_info *)item->util;
345                 if (mi->name == NULL && mi->email == NULL) {
346                         debug_mm("map_user:  -- (no simple mapping)\n");
347                         return 0;
348                 }
349                 if (mi->email) {
350                                 *email = mi->email;
351                                 *emaillen = strlen(*email);
352                 }
353                 if (mi->name) {
354                                 *name = mi->name;
355                                 *namelen = strlen(*name);
356                 }
357                 debug_mm("map_user:  to '%.*s' <%.*s>\n",
358                          (int)*namelen, debug_str(*name),
359                          (int)*emaillen, debug_str(*email));
360                 return 1;
361         }
362         debug_mm("map_user:  --\n");
363         return 0;
364 }