blame: tolerate bogus e-mail addresses a bit better

The names and e-mails are sanitized by fmt_ident() when creating commits,
so that they do not contain "<" nor ">", and the "committer" and "author"
lines in the commit object will always be in the form:

    ("author" | "committer") name SP "<" email ">" SP timestamp SP zone

When parsing the email part out, the current code looks for SP starting
from the end of the email part, but the author could obfuscate the address
as "author at example dot com".

We should instead look for SP followed by "<", to match the logic of the
side that formats these lines.

Signed-off-by: Josh Stone <jistone@redhat.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/blame.c

@@ -1377,7 +1377,7 @@ static void get_ac_line(const char *inbuf, const char *what,
 	timepos = tmp;
 
 	*tmp = 0;
-	while (person < tmp && *tmp != ' ')
+	while (person < tmp && !(*tmp == ' ' && tmp[1] == '<'))
 		tmp--;
 	if (tmp <= person)
 		return;

t/annotate-tests.sh

@@ -1,5 +1,5 @@
 # This file isn't used as a test script directly, instead it is
-# sourced from t8001-annotate.sh and t8001-blame.sh.
+# sourced from t8001-annotate.sh and t8002-blame.sh.
 
 check_count () {
 	head=
@@ -124,3 +124,13 @@ test_expect_success \
 test_expect_success \
     'some edit' \
     'check_count A 1 B 1 B1 1 B2 1 "A U Thor" 1 C 1 D 1'
+
+test_expect_success \
+    'an obfuscated email added' \
+    'sed -e "1i No robots allowed" < file > file.new &&
+     mv file.new file &&
+     GIT_AUTHOR_NAME="E" GIT_AUTHOR_EMAIL="E at test dot git" git commit -a -m "norobots"'
+
+test_expect_success \
+    'obfuscated email parsed' \
+    'check_count A 1 B 1 B1 1 B2 1 "A U Thor" 1 C 1 D 1 E 1'

t/t8002-blame.sh

@@ -8,7 +8,7 @@ PROG='git blame -c'
 
 PROG='git blame -c -e'
 test_expect_success 'Blame --show-email works' '
-    check_count "<A@test.git>" 1 "<B@test.git>" 1 "<B1@test.git>" 1 "<B2@test.git>" 1 "<author@example.com>" 1 "<C@test.git>" 1 "<D@test.git>" 1
+    check_count "<A@test.git>" 1 "<B@test.git>" 1 "<B1@test.git>" 1 "<B2@test.git>" 1 "<author@example.com>" 1 "<C@test.git>" 1 "<D@test.git>" 1 "<E at test dot git>" 1
 '
 
 test_done