Add index-format-hook and expando.

index-format-hook is used to allow dynamic insertion/evaluation of
format strings into $index_format.

It can be used, for example, to implement date formatting based on the
age of the message.

Add a new %@name@ expando to $index_format, which evaluates the
matching index-format-hooks with "name".

1 files changed, 23 insertions, 0 deletions

diff --git a/hdrline.c b/hdrline.c
index ea76e836..5e79d32d 100644
--- a/hdrline.c
+++ b/hdrline.c
@@ -753,6 +753,29 @@ hdr_format_str (char *dest,
 
       break;
 
+    case '@':
+    {
+      const char *end = src;
+      static unsigned char recurse = 0;
+
+      while (*end && *end != '@')
+        end++;
+      if ((*end == '@') && (recurse < 20))
+      {
+        recurse++;
+        mutt_substrcpy (buf2, src, end, sizeof(buf2));
+        mutt_FormatString (buf2, sizeof(buf2), col, cols,
+                           NONULL (mutt_idxfmt_hook (buf2, ctx, hdr)),
+                           hdr_format_str, (unsigned long) hfi, flags);
+        mutt_format_s (dest, destlen, prefix, buf2);
+        recurse--;
+
+        src = end + 1;
+        break;
+      }
+      /* otherwise fall through */
+    }
+
     default:
       snprintf (dest, destlen, "%%%s%c", prefix, op);
       break;