[PATCH v2 2/2] blame: use different blame_date_width for different locale

[Jiang Xin <worldhello.net@gmail.com>]

When show date in relative date format for `git blame`, the max display
width of datetime is set as the length of the string "Thu Oct 19
16:00:04 2006 -0700" (30 characters long).  But actually the max width
for C locale is only 22 (the length of string "x years, xx months ago").
And for other locale, it maybe smaller.  E.g. For Chinese locale, only
needs 16-character width.

Set blame_date_width as the display width of _("4 years, 11 months
ago"), so that translators can make the choice.

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
---
 builtin/blame.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/builtin/blame.c b/builtin/blame.c
index 0a0a858..9350ea3 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -2340,7 +2340,15 @@ parse_done:
 		blame_date_width = sizeof("2006-10-19");
 		break;
 	case DATE_RELATIVE:
-		/* "normal" is used as the fallback for "relative" */
+		/* TRANSLATORS: what we care about is not the content itself,
+		   but the display width of this string.  We use the width of
+		   the string as the max width of the datetime in relative
+		   format.  For English and many other languages, "4 years,
+		   11 months ago" is the longest one among "89 seconds ago",
+		   "89 minites ago", "35 hours ago", "13 days ago", "10 weeks
+		   ago", "in the future" and many others. */
+		blame_date_width = utf8_strwidth(_("4 years, 11 months ago")) + 1; /* add the null */
+		break;
 	case DATE_LOCAL:
 	case DATE_NORMAL:
 		blame_date_width = sizeof("Thu Oct 19 16:00:04 2006 -0700");
-- 
2.0.0.rc0.3.g444188f.dirty