Initials are shorter and often unique enough in a
per-project setting, so they can be used to give a more
informative version of --oneline.

The 'S' in the placeholder is for "short" (and 's' is
already taken by DATE_SHORT), but obviously that's pretty
arcane.

Possibly there should be more customization of initials,
asking for only 2-letter initials, etc.

Signed-off-by: Jeff King <p...@peff.net>
---
When I first tested it with "git log --format=%aS" I had to wonder "who
the heck is ntnd?". So using only the first-and-last would match the git
project's practice better, at least.

 pretty.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/pretty.c b/pretty.c
index c532c17..de62405 100644
--- a/pretty.c
+++ b/pretty.c
@@ -674,6 +674,23 @@ static int mailmap_name(const char **email, size_t 
*email_len,
        return mail_map->nr && map_user(mail_map, email, email_len, name, 
name_len);
 }
 
+static void format_initials(struct strbuf *out, const char *name, size_t len)
+{
+       int initial = 1;
+       size_t i;
+
+       for (i = 0; i < len; i++) {
+               char c = name[i];
+               if (isspace(c)) {
+                       initial = 1;
+                       continue;
+               }
+               if (initial && isalpha(c))
+                       strbuf_addch(out, tolower(c));
+               initial = 0;
+       }
+}
+
 static size_t format_person_part(struct strbuf *sb, char part,
                                 const char *msg, int len,
                                 const struct date_mode *dmode)
@@ -702,6 +719,10 @@ static size_t format_person_part(struct strbuf *sb, char 
part,
                strbuf_add(sb, mail, maillen);
                return placeholder_len;
        }
+       if (part == 'S') {
+               format_initials(sb, name, namelen);
+               return placeholder_len;
+       }
 
        if (!s.date_begin)
                goto skip;
-- 
2.10.0.566.g5365f87

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