[PATCH] Mailmap: Allow empty email addresses to be mapped

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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@xxxxxx>
---
 mailmap.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/mailmap.c b/mailmap.c
index f12bb45..654c629 100644
--- 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);
-- 
1.6.2.1.425.ga9a94
--
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