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#include "cache.h"
#include "string-list.h"
#include "mailmap.h"

#define DEBUG_MAILMAP 0
#if DEBUG_MAILMAP
#define debug_mm(...) fprintf(stderr, __VA_ARGS__)
#else
static inline void debug_mm(const char *format, ...) {}
#endif

const char *git_mailmap_file;

struct mailmap_info {
char *name;
char *email;
};

struct mailmap_entry {
/* name and email for the simple mail-only case */
char *name;
char *email;

/* name and email for the complex mail and name matching case */
struct string_list namemap;
};

static void free_mailmap_info(void *p, const char *s)
{
struct mailmap_info *mi = (struct mailmap_info *)p;
debug_mm("mailmap: -- complex: '%s' -> '%s' <%s>\n", s, mi->name, mi->email);
free(mi->name);
free(mi->email);
}

static void free_mailmap_entry(void *p, const char *s)
{
struct mailmap_entry *me = (struct mailmap_entry *)p;
debug_mm("mailmap: removing entries for <%s>, with %d sub-entries\n", s, me->namemap.nr);
debug_mm("mailmap: - simple: '%s' <%s>\n", me->name, me->email);
free(me->name);
free(me->email);

me->namemap.strdup_strings = 1;
string_list_clear_func(&me->namemap, free_mailmap_info);
}

static void add_mapping(struct string_list *map,
char *new_name, char *new_email, char *old_name, char *old_email)
{
struct mailmap_entry *me;
int index;
char *p;

if (old_email)
for (p = old_email; *p; p++)
*p = tolower(*p);
if (new_email)
for (p = new_email; *p; p++)
*p = tolower(*p);

if (old_email == NULL) {
old_email = new_email;
new_email = NULL;
}

if ((index = string_list_find_insert_index(map, old_email, 1)) < 0) {
/* mailmap entry exists, invert index value */
index = -1 - index;
} else {
/* create mailmap entry */
struct string_list_item *item = string_list_insert_at_index(map, index, old_email);
item->util = xmalloc(sizeof(struct mailmap_entry));
memset(item->util, 0, sizeof(struct mailmap_entry));
((struct mailmap_entry *)item->util)->namemap.strdup_strings = 1;
}
me = (struct mailmap_entry *)map->items[index].util;

if (old_name == NULL) {
debug_mm("mailmap: adding (simple) entry for %s at index %d\n", old_email, index);
/* Replace current name and new email for simple entry */
free(me->name);
free(me->email);
if (new_name)
me->name = xstrdup(new_name);
if (new_email)
me->email = xstrdup(new_email);
} else {
struct mailmap_info *mi = xmalloc(sizeof(struct mailmap_info));
debug_mm("mailmap: adding (complex) entry for %s at index %d\n", old_email, index);
if (new_name)
mi->name = xstrdup(new_name);
if (new_email)
mi->email = xstrdup(new_email);
string_list_insert(&me->namemap, old_name)->util = mi;
}

debug_mm("mailmap: '%s' <%s> -> '%s' <%s>\n",
old_name, old_email, new_name, new_email);
}

static char *parse_name_and_email(char *buffer, char **name,
char **email, int allow_empty_email)
{
char *left, *right, *nstart, *nend;
*name = *email = NULL;

if ((left = strchr(buffer, '<')) == NULL)
return NULL;
if ((right = strchr(left+1, '>')) == NULL)
return NULL;
if (!allow_empty_email && (left+1 == right))
return NULL;

/* remove whitespace from beginning and end of name */
nstart = buffer;
while (isspace(*nstart) && nstart < left)
++nstart;
nend = left-1;
while (isspace(*nend) && nend > nstart)
--nend;

*name = (nstart < nend ? nstart : NULL);
*email = left+1;
*(nend+1) = '\0';
*right++ = '\0';

return (*right == '\0' ? NULL : right);
}

static int read_single_mailmap(struct string_list *map, const char *filename, char **repo_abbrev)
{
char buffer[1024];
FILE *f = (filename == NULL ? NULL : fopen(filename, "r"));

if (f == NULL)
return 1;
while (fgets(buffer, sizeof(buffer), f) != NULL) {
char *name1 = NULL, *email1 = NULL, *name2 = NULL, *email2 = NULL;
if (buffer[0] == '#') {
static const char abbrev[] = "# repo-abbrev:";
int abblen = sizeof(abbrev) - 1;
int len = strlen(buffer);

if (!repo_abbrev)
continue;

if (len && buffer[len - 1] == '\n')
buffer[--len] = 0;
if (!strncmp(buffer, abbrev, abblen)) {
char *cp;

if (repo_abbrev)
free(*repo_abbrev);
*repo_abbrev = xmalloc(len);

for (cp = buffer + abblen; isspace(*cp); cp++)
; /* nothing */
strcpy(*repo_abbrev, cp);
}
continue;
}
if ((name2 = parse_name_and_email(buffer, &name1, &email1, 0)) != NULL)
parse_name_and_email(name2, &name2, &email2, 1);

if (email1)
add_mapping(map, name1, email1, name2, email2);
}
fclose(f);
return 0;
}

int read_mailmap(struct string_list *map, char **repo_abbrev)
{
map->strdup_strings = 1;
/* each failure returns 1, so >1 means both calls failed */
return read_single_mailmap(map, ".mailmap", repo_abbrev) +
read_single_mailmap(map, git_mailmap_file, repo_abbrev) > 1;
}

void clear_mailmap(struct string_list *map)
{
debug_mm("mailmap: clearing %d entries...\n", map->nr);
map->strdup_strings = 1;
string_list_clear_func(map, free_mailmap_entry);
debug_mm("mailmap: cleared\n");
}

int map_user(struct string_list *map,
char *email, int maxlen_email, char *name, int maxlen_name)
{
char *p;
struct string_list_item *item;
struct mailmap_entry *me;
char buf[1024], *mailbuf;
int i;

/* figure out space requirement for email */
p = strchr(email, '>');
if (!p) {
/* email passed in might not be wrapped in <>, but end with a \0 */
p = memchr(email, '\0', maxlen_email);
if (!p)
return 0;
}
if (p - email + 1 < sizeof(buf))
mailbuf = buf;
else
mailbuf = xmalloc(p - email + 1);

/* downcase the email address */
for (i = 0; i < p - email; i++)
mailbuf[i] = tolower(email[i]);
mailbuf[i] = 0;

debug_mm("map_user: map '%s' <%s>\n", name, mailbuf);
item = string_list_lookup(map, mailbuf);
if (item != NULL) {
me = (struct mailmap_entry *)item->util;
if (me->namemap.nr) {
/* The item has multiple items, so we'll look up on name too */
/* If the name is not found, we choose the simple entry */
struct string_list_item *subitem = string_list_lookup(&me->namemap, name);
if (subitem)
item = subitem;
}
}
if (mailbuf != buf)
free(mailbuf);
if (item != NULL) {
struct mailmap_info *mi = (struct mailmap_info *)item->util;
if (mi->name == NULL && (mi->email == NULL || maxlen_email == 0)) {
debug_mm("map_user: -- (no simple mapping)\n");
return 0;
}
if (maxlen_email && mi->email)
strlcpy(email, mi->email, maxlen_email);
if (maxlen_name && mi->name)
strlcpy(name, mi->name, maxlen_name);
debug_mm("map_user: to '%s' <%s>\n", name, mi->email ? mi->email : "");
return 1;
}
debug_mm("map_user: --\n");
return 0;
}
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