[PATCH] format-patch: Make sure the subject is always a one-liner

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If the commit message has no empty line after the first line, we need to
insert a newline after the first, so that the newlines won't be removed
from the commit message for example when they are applied using git-am.

Signed-off-by: Miklos Vajna <vmiklos@xxxxxxxxxxxxxx>
---

On Wed, Apr 16, 2008 at 02:37:25AM +0200, Miklos Vajna <vmiklos@xxxxxxxxxxxxxx> wrote:
> If we are at it, I had a similar bugreport: If one doesn't use an
> empty
> line after the first line in the commit message, a git-format-patch +
> git-am combo will strip newlines from the commit message:
>
> http://article.gmane.org/gmane.comp.version-control.git/73755
>
> There, you suggested to modify git-format-patch, but I haven't come up
> with such a patch nor anybody else.
>
> Actually I recently tried to make one but I got lost in pretty.c and
> log-tree.c. :-)

Ok, here is a try. It does the trick for me, but this it the first time
I touch pretty.c so feel free to point out if I did something wrong ;-)

Thanks.

 pretty.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/pretty.c b/pretty.c
index 6c04176..45a5679 100644
--- a/pretty.c
+++ b/pretty.c
@@ -653,6 +653,7 @@ void pp_title_line(enum cmit_fmt fmt,
 
 	strbuf_init(&title, 80);
 
+	int check_empty = 1;
 	for (;;) {
 		const char *line = *msg_p;
 		int linelen = get_one_line(line);
@@ -666,7 +667,10 @@ void pp_title_line(enum cmit_fmt fmt,
 			if (fmt == CMIT_FMT_EMAIL) {
 				strbuf_addch(&title, '\n');
 			}
-			strbuf_addch(&title, ' ');
+			if (check_empty && strcmp(line, "\n")) {
+				check_empty = 0;
+				strbuf_addch(&title, '\n');
+			}
 		}
 		strbuf_add(&title, line, linelen);
 	}
-- 
1.5.5

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