format-patch: wrap email addresses after long names

We already wrap names in "from" headers, which tend to be
the long part of an address. But it's also possible for a
long name to not be wrapped, but to make us want to wrap the
email address. For example (imagine for the sake of
readability we want to wrap at 50 characters instead of 78):

  From: this is my really long git name <foo@example.com>

The name does not overflow the line, but the name and email
together do. So we would rather see:

  From: this is my really long git name
    <git@example.com>

Because we wrap the name separately during add_rfc2047, we
neglected this case. Instead, we should see how long the
final line of the wrapped name ended up, and decide whether
or not to wrap based on that. We can't break the address
into multiple parts, so we either leave it with the name, or
put it by itself on a line.

Test by Erik Faye-Lund.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/pretty.c b/pretty.c
index 65d20a7a2e7cafd79ff95c02cab3303ebb72351c..305ff85d744e40ce00879fd087205567c156bc51 100644 (file)
--- a/pretty.c
+++ b/pretty.c
@@ -287,6 +287,7 @@ void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
        if (fmt == CMIT_FMT_EMAIL) {
                char *name_tail = strchr(line, '<');
                int display_name_length;
+               int final_line;
                if (!name_tail)
                        return;
                while (line < name_tail && isspace(name_tail[-1]))
@@ -294,6 +295,14 @@ void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
                display_name_length = name_tail - line;
                strbuf_addstr(sb, "From: ");
                add_rfc2047(sb, line, display_name_length, encoding);
+               for (final_line = 0; final_line < sb->len; final_line++)
+                       if (sb->buf[sb->len - final_line - 1] == '\n')
+                               break;
+               if (namelen - display_name_length + final_line > 78) {
+                       strbuf_addch(sb, '\n');
+                       if (!isspace(name_tail[0]))
+                               strbuf_addch(sb, ' ');
+               }
                strbuf_add(sb, name_tail, namelen - display_name_length);
                strbuf_addch(sb, '\n');
        } else {

diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 9c663677df0887cc09ce2c8277ec300e8de4eaaa..9f64a4e2a1119f21cec2fc99e749243333ed2855 100755 (executable)
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -793,4 +793,19 @@ test_expect_success 'format-patch wraps extremely long headers (rfc2047)' '
        test_cmp expect subject
 '
 
+M8="foo_bar_"
+M64=$M8$M8$M8$M8$M8$M8$M8$M8
+cat >expect <<EOF
+From: $M64
+ <foobar@foo.bar>
+EOF
+test_expect_success 'format-patch wraps non-quotable headers' '
+       rm -rf patches/ &&
+       echo content >>file &&
+       git add file &&
+       git commit -mfoo --author "$M64 <foobar@foo.bar>" &&
+       git format-patch --stdout -1 >patch &&
+       sed -n "/^From: /p; /^ /p; /^$/q" <patch >from &&
+       test_cmp expect from
+'
 test_done