templates: separate thread prefix from subject

Extract {{.ThreadPrefix}} from {{.Subject}} so that the prefix can be
styled in a different color.

Signed-off-by: Robin Jarry <robin@jarry.cc>
Acked-by: Tim Culverhouse <tim@timculverhouse.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/config/templates.go b/config/templates.go
index d3e7cfb0..96fbccb1 100644
--- a/config/templates.go
+++ b/config/templates.go
@@ -74,7 +74,8 @@ func (d *dummyData) ReplyTo() []*mail.Address        { return nil }
 func (d *dummyData) Date() time.Time                 { return time.Now() }
 func (d *dummyData) DateAutoFormat(time.Time) string { return "" }
 func (d *dummyData) Header(string) string            { return "" }
-func (d *dummyData) Subject() string                 { return "[PATCH] hey" }
+func (d *dummyData) ThreadPrefix() string            { return "└─>" }
+func (d *dummyData) Subject() string                 { return "Re: [PATCH] hey" }
 func (d *dummyData) Number() int                     { return 0 }
 func (d *dummyData) Labels() []string                { return nil }
 func (d *dummyData) Flags() []string                 { return nil }