added "online-status" event.

E.g. ```{"event": "online-status", "online": true, "when": "2015-05-20 00:16:40", "state": 1}```

interface.c

@@ -1970,7 +1970,7 @@ void print_chat_info_gw (struct tgl_state *TLSR, void *extra, int success, struc
 }
 
 void print_user_status (struct tgl_user_status *S, struct in_ev *ev) {
-  if (enable_json) { return; }
+  assert(!enable_json); //calling functions print_user_info_gw() and user_status_upd() already check.
   if (S->online > 0) {
     mprintf (ev, "online (was online ");
     print_date_full (ev, S->when);
@@ -2561,16 +2561,26 @@ void user_status_upd (struct tgl_state *TLS, struct tgl_user *U) {
   if (disable_output && !notify_ev) { return; }
   if (!binlog_read) { return; }
   if (log_level < 3) { return; }
-  if (enable_json) { return; }
   struct in_ev *ev = notify_ev;
   mprint_start (ev);
-  mpush_color (ev, COLOR_YELLOW);
-  mprintf (ev, "User ");
-  print_user_name (ev, U->id, (void *)U);
-  mprintf (ev, " ");
-  print_user_status (&U->status, ev);
-  mprintf (ev, "\n");
-  mpop_color (ev);
+  if (!enable_json)
+  {
+    mpush_color (ev, COLOR_YELLOW);
+    mprintf (ev, "User ");
+    print_user_name(ev, U->id, (void *) U);
+    mprintf (ev, " ");
+    print_user_status(&U->status, ev);
+    mprintf (ev, "\n");
+    mpop_color (ev);
+  } else {
+    #ifdef USE_JSON
+      json_t *res = json_pack_user_status(&U->status);
+      char *s = json_dumps (res, 0);
+      mprintf (ev, "%s\n", s);
+      json_decref (res);
+      free (s);
+    #endif
+  }
   mprint_end (ev);
 }
 

json-tg.c

@@ -6,6 +6,8 @@
 #include <tgl/tgl.h>
 #include <tgl/tgl-layout.h>
 #include <assert.h>
+//format time:
+#include <time.h>
 
 #ifndef json_boolean
 #define json_boolean(val)      ((val) ? json_true() : json_false())
@@ -381,4 +383,32 @@ json_t *json_pack_read (struct tgl_message *M) {
   return res;
 }
 
+int str_format_time(long when, char* string)
+{
+  struct tm *tm = localtime ((void *)&when);
+  return sprintf (string, "%04d-%02d-%02d %02d:%02d:%02d", tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
+}
+
+json_t *json_pack_user_status (struct tgl_user_status *S) {
+  json_t *res = json_object ();
+  assert (json_object_set (res, "online", json_boolean (S->online == 1)) >= 0);
+  assert (json_object_set (res, "state", json_integer (S->online)) >= 0);
+  if (S->online > 0 || S->online == -1) {
+    static char s[20];
+    str_format_time(S->when, s);
+    assert (json_object_set (res, "when", json_string (s)) >= 0);
+  } else if (S->online == 0) {
+    assert (json_object_set(res, "when", json_string("long time ago")) >= 0);
+  } else if (S->online == -2) {
+    assert (json_object_set(res, "when", json_string("recently")) >= 0);
+  } else if (S->online == -3) {
+    assert (json_object_set(res, "when", json_string("last week")) >= 0);
+  } else if (S->online == -4) {
+    assert (json_object_set (res, "when", json_string ("last month")) >= 0);
+  }
+  assert (json_object_set (res, "event", json_string ("online-status")) >= 0);
+  //this will overwrite "event":"message" to "event":"read".
+  return res;
+}
+
 #endif

json-tg.h

@@ -3,11 +3,12 @@
 #include "config.h"
 #ifdef USE_JSON
 #include <jansson.h>
-#include <tgl.h>
-#include <tgl-layout.h>
+#include <tgl/tgl.h>
+#include <tgl/tgl-layout.h>
 json_t *json_pack_message (struct tgl_message *M);
 json_t *json_pack_updates (unsigned flags);
 json_t *json_pack_peer (tgl_peer_id_t id, tgl_peer_t *P);
 json_t *json_pack_read (struct tgl_message *M);
+json_t *json_pack_user_status (struct tgl_user_status *S);
 #endif
 #endif