Mailmap: Allow empty email addresses to be mapped

While it makes no sense to map some email address to an empty one, doing
things the other way around can be useful. For example when using
filter-branch with an env-filter that employs a mailmap to fix up an
import that created such broken commits with empty email addresses.

Signed-off-by: Björn Steinbrink <B.Steinbrink@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/mailmap.c b/mailmap.c
index f12bb45a3f734e48f003a7a2943d168c26778603..654c6295cb10eaf5e0b8af1d4e185f8d1ff7663b 100644 (file)
--- a/mailmap.c
+++ b/mailmap.c
@@ -90,7 +90,8 @@ static void add_mapping(struct string_list *map,
                 old_name, old_email, new_name, new_email);
 }
 
-static char *parse_name_and_email(char *buffer, char **name, char **email)
+static char *parse_name_and_email(char *buffer, char **name,
+               char **email, int allow_empty_email)
 {
        char *left, *right, *nstart, *nend;
        *name = *email = 0;
@@ -99,7 +100,7 @@ static char *parse_name_and_email(char *buffer, char **name, char **email)
                return NULL;
        if ((right = strchr(left+1, '>')) == NULL)
                return NULL;
-       if (left+1 == right)
+       if (!allow_empty_email && (left+1 == right))
                return NULL;
 
        /* remove whitespace from beginning and end of name */
@@ -150,8 +151,8 @@ static int read_single_mailmap(struct string_list *map, const char *filename, ch
                        }
                        continue;
                }
-               if ((name2 = parse_name_and_email(buffer, &name1, &email1)) != NULL)
-                       parse_name_and_email(name2, &name2, &email2);
+               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);