bisect: improve error message of 'bisect log' while not bisecting
[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 #else
9 static inline void debug_mm(const char *format, ...) {}
10 #endif
11
12 const char *git_mailmap_file;
13
14 struct mailmap_info {
15         char *name;
16         char *email;
17 };
18
19 struct mailmap_entry {
20         /* name and email for the simple mail-only case */
21         char *name;
22         char *email;
23
24         /* name and email for the complex mail and name matching case */
25         struct string_list namemap;
26 };
27
28 static void free_mailmap_info(void *p, const char *s)
29 {
30         struct mailmap_info *mi = (struct mailmap_info *)p;
31         debug_mm("mailmap: -- complex: '%s' -> '%s' <%s>\n", s, mi->name, mi->email);
32         free(mi->name);
33         free(mi->email);
34 }
35
36 static void free_mailmap_entry(void *p, const char *s)
37 {
38         struct mailmap_entry *me = (struct mailmap_entry *)p;
39         debug_mm("mailmap: removing entries for <%s>, with %d sub-entries\n", s, me->namemap.nr);
40         debug_mm("mailmap: - simple: '%s' <%s>\n", me->name, me->email);
41         free(me->name);
42         free(me->email);
43
44         me->namemap.strdup_strings = 1;
45         string_list_clear_func(&me->namemap, free_mailmap_info);
46 }
47
48 static void add_mapping(struct string_list *map,
49                         char *new_name, char *new_email, char *old_name, char *old_email)
50 {
51         struct mailmap_entry *me;
52         int index;
53         char *p;
54
55         if (old_email)
56                 for (p = old_email; *p; p++)
57                         *p = tolower(*p);
58         if (new_email)
59                 for (p = new_email; *p; p++)
60                         *p = tolower(*p);
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         } else {
71                 /* create mailmap entry */
72                 struct string_list_item *item = string_list_insert_at_index(map, index, old_email);
73                 item->util = xmalloc(sizeof(struct mailmap_entry));
74                 memset(item->util, 0, sizeof(struct mailmap_entry));
75                 ((struct mailmap_entry *)item->util)->namemap.strdup_strings = 1;
76         }
77         me = (struct mailmap_entry *)map->items[index].util;
78
79         if (old_name == NULL) {
80                 debug_mm("mailmap: adding (simple) entry for %s at index %d\n", old_email, index);
81                 /* Replace current name and new email for simple entry */
82                 free(me->name);
83                 free(me->email);
84                 if (new_name)
85                         me->name = xstrdup(new_name);
86                 if (new_email)
87                         me->email = xstrdup(new_email);
88         } else {
89                 struct mailmap_info *mi = xmalloc(sizeof(struct mailmap_info));
90                 debug_mm("mailmap: adding (complex) entry for %s at index %d\n", old_email, index);
91                 if (new_name)
92                         mi->name = xstrdup(new_name);
93                 if (new_email)
94                         mi->email = xstrdup(new_email);
95                 string_list_insert(&me->namemap, old_name)->util = mi;
96         }
97
98         debug_mm("mailmap:  '%s' <%s> -> '%s' <%s>\n",
99                  old_name, old_email, new_name, new_email);
100 }
101
102 static char *parse_name_and_email(char *buffer, char **name,
103                 char **email, int allow_empty_email)
104 {
105         char *left, *right, *nstart, *nend;
106         *name = *email = NULL;
107
108         if ((left = strchr(buffer, '<')) == NULL)
109                 return NULL;
110         if ((right = strchr(left+1, '>')) == NULL)
111                 return NULL;
112         if (!allow_empty_email && (left+1 == right))
113                 return NULL;
114
115         /* remove whitespace from beginning and end of name */
116         nstart = buffer;
117         while (isspace(*nstart) && nstart < left)
118                 ++nstart;
119         nend = left-1;
120         while (isspace(*nend) && nend > nstart)
121                 --nend;
122
123         *name = (nstart < nend ? nstart : NULL);
124         *email = left+1;
125         *(nend+1) = '\0';
126         *right++ = '\0';
127
128         return (*right == '\0' ? NULL : right);
129 }
130
131 static int read_single_mailmap(struct string_list *map, const char *filename, char **repo_abbrev)
132 {
133         char buffer[1024];
134         FILE *f = (filename == NULL ? NULL : fopen(filename, "r"));
135
136         if (f == NULL)
137                 return 1;
138         while (fgets(buffer, sizeof(buffer), f) != NULL) {
139                 char *name1 = NULL, *email1 = NULL, *name2 = NULL, *email2 = NULL;
140                 if (buffer[0] == '#') {
141                         static const char abbrev[] = "# repo-abbrev:";
142                         int abblen = sizeof(abbrev) - 1;
143                         int len = strlen(buffer);
144
145                         if (!repo_abbrev)
146                                 continue;
147
148                         if (len && buffer[len - 1] == '\n')
149                                 buffer[--len] = 0;
150                         if (!strncmp(buffer, abbrev, abblen)) {
151                                 char *cp;
152
153                                 if (repo_abbrev)
154                                         free(*repo_abbrev);
155                                 *repo_abbrev = xmalloc(len);
156
157                                 for (cp = buffer + abblen; isspace(*cp); cp++)
158                                         ; /* nothing */
159                                 strcpy(*repo_abbrev, cp);
160                         }
161                         continue;
162                 }
163                 if ((name2 = parse_name_and_email(buffer, &name1, &email1, 0)) != NULL)
164                         parse_name_and_email(name2, &name2, &email2, 1);
165
166                 if (email1)
167                         add_mapping(map, name1, email1, name2, email2);
168         }
169         fclose(f);
170         return 0;
171 }
172
173 int read_mailmap(struct string_list *map, char **repo_abbrev)
174 {
175         map->strdup_strings = 1;
176         /* each failure returns 1, so >1 means both calls failed */
177         return read_single_mailmap(map, ".mailmap", repo_abbrev) +
178                read_single_mailmap(map, git_mailmap_file, repo_abbrev) > 1;
179 }
180
181 void clear_mailmap(struct string_list *map)
182 {
183         debug_mm("mailmap: clearing %d entries...\n", map->nr);
184         map->strdup_strings = 1;
185         string_list_clear_func(map, free_mailmap_entry);
186         debug_mm("mailmap: cleared\n");
187 }
188
189 int map_user(struct string_list *map,
190              char *email, int maxlen_email, char *name, int maxlen_name)
191 {
192         char *p;
193         struct string_list_item *item;
194         struct mailmap_entry *me;
195         char buf[1024], *mailbuf;
196         int i;
197
198         /* figure out space requirement for email */
199         p = strchr(email, '>');
200         if (!p) {
201                 /* email passed in might not be wrapped in <>, but end with a \0 */
202                 p = memchr(email, '\0', maxlen_email);
203                 if (!p)
204                         return 0;
205         }
206         if (p - email + 1 < sizeof(buf))
207                 mailbuf = buf;
208         else
209                 mailbuf = xmalloc(p - email + 1);
210
211         /* downcase the email address */
212         for (i = 0; i < p - email; i++)
213                 mailbuf[i] = tolower(email[i]);
214         mailbuf[i] = 0;
215
216         debug_mm("map_user: map '%s' <%s>\n", name, mailbuf);
217         item = string_list_lookup(map, mailbuf);
218         if (item != NULL) {
219                 me = (struct mailmap_entry *)item->util;
220                 if (me->namemap.nr) {
221                         /* The item has multiple items, so we'll look up on name too */
222                         /* If the name is not found, we choose the simple entry      */
223                         struct string_list_item *subitem = string_list_lookup(&me->namemap, name);
224                         if (subitem)
225                                 item = subitem;
226                 }
227         }
228         if (mailbuf != buf)
229                 free(mailbuf);
230         if (item != NULL) {
231                 struct mailmap_info *mi = (struct mailmap_info *)item->util;
232                 if (mi->name == NULL && (mi->email == NULL || maxlen_email == 0)) {
233                         debug_mm("map_user:  -- (no simple mapping)\n");
234                         return 0;
235                 }
236                 if (maxlen_email && mi->email)
237                         strlcpy(email, mi->email, maxlen_email);
238                 if (maxlen_name && mi->name)
239                         strlcpy(name, mi->name, maxlen_name);
240                 debug_mm("map_user:  to '%s' <%s>\n", name, mi->email ? mi->email : "");
241                 return 1;
242         }
243         debug_mm("map_user:  --\n");
244         return 0;
245 }