Forgot to commit this one during the "search by age" changes.

diff --git a/lib/index.h b/lib/index.h
index 6a22cf17b3b66149120b493cc44e2b2e619cb8c4..0585141245e440dd4b03e0dc75068956ee00abea 100644 (file)
--- a/lib/index.h
+++ b/lib/index.h
@@ -10,6 +10,12 @@
 
 /* Word and string types are defined in lib/custom.h */
 
+/* Global index parameters */
+
+struct index_params {
+  sh_time_t ref_time;                  /* Reference time (for document ages etc.) */
+};
+
 /* Index card attributes */
 
 struct card_attr {
@@ -20,7 +26,8 @@ struct card_attr {
 #undef INT_ATTR
   byte weight;
   byte flags;
-  // byte rfu[2];                      /* If no custom attributes are defined */
+  byte age;                            /* Document age in pseudo-logarithmic units wrt. reference time */
+  // byte rfu[1];                      /* If no custom attributes are defined */
 };
 
 enum card_flag {
@@ -72,3 +79,26 @@ fp_hash(struct fingerprint *fp)
   else                                                         \
     p++;                                                       \
 } while (0)
+
+/* Conversion of document age from seconds to our internal units */
+
+static inline int
+convert_age(sh_time_t lastmod, sh_time_t reftime)
+{
+  sh_time_t age;
+  if (reftime < lastmod)               /* past times */
+    return -1;
+  age = (reftime - lastmod) / 3600;
+  if (age < 48)                                /* last 2 days: 1 hour resolution */
+    return age;
+  age = (age-48) / 24;
+  if (age < 64)                                /* next 64 days: 1 day resolution */
+    return 48 + age;
+  age = (age-64) / 7;
+  if (age < 135)                       /* next 135 weeks: 1 week resolution */
+    return 112 + age;
+  age = (age-135) / 52;
+  if (age < 8)                         /* next 8 years: 1 year resolution */
+    return 247 + age;
+  return 255;                          /* then just "infinite future" */
+}