ditched x/c functionality in favor of binary expansion

ii-doc.txt

@@ -40,12 +40,9 @@ In case of multi-line responses, the newline separator must be "\n" character
 Request: GET /list.txt
 Response: newline-separated list of echo_name:msg_count:echo_description
 
-- Fetching the echo message count (IDEC extension) -
-
-Request: GET /x/c/echo.1.name/echo.2.name/..
-Response: newline separated list of echo_name:msg_count
-
 Note: msg_count must not decrease even if some messages are deleted.
+Some nodes (e.g. ii-php) still can violate this rule, so the message count
+reported by nodes still should not be the basis for any client-side logic.
 
 - Listing messages in the echo (s) -
 
@@ -87,7 +84,7 @@ The maximum length of the tmsg field must be 87382 bytes.
 
 Request: GET /x/features
 Response: newline-separated list of supported non-standard URL paths
-(x/c, u/e, /list.txt etc)
+(u/e, /list.txt etc)
 
 Note: if the /x/features path is unavailable, the client must assume that no
 IDEC extensions except /list.txt are supported by the server.

tiifetch.tcl

@@ -212,31 +212,45 @@ proc fetchiidb {url echos dbfile dolog maxids} {
   } else {
     set echos [split $echos "/,;"]
   }
-  if {$dolog eq 1} {puts "Echos to fetch: $echos"}
   set echos [lmap s $echos {string trim $s}]
+  if {$dolog eq 1} {puts "Echos to fetch: $echos"}
+  if {$dolog eq 1} {puts "Building message indexes..."}
   # get the IDEC extended feature list
   set featurelist ""
   catch {set featurelist [getfile [string cat $url "/x/features"]]}
   set featurelist [lmap s [split $featurelist \n] {string trim $s}]
   set datalines ""
-  if {([lsearch $featurelist x/c] > -1 ) && ([lsearch $featurelist u/e] > -1)} {
-    # get message count in every echo of our choice  
-    set countdata [getfile [string cat $url "/x/c/" [join $echos "/"]]]
-    foreach cd $countdata {
-      set cdparts [split $cd :]
-      if {[llength $cdparts] > 1} {
-        set ename [lindex $cdparts 0]
-        set rcount [lindex $cdparts 1]
-        set lcount [msgdb eval {SELECT COUNT (DISTINCT `id`) FROM `msg` WHERE `echoname` = $ename;}]
-        # get the difference between remote and local counts
-        set diff [expr {$rcount - $lcount}]
-        if {$diff > 0} { # we have something to fetch
-          set localdata [getfile [string cat $url "/u/e/" $ename "/-$diff:$diff"]]
-          append datalines [string trim $localdata] \n
+  if {[lsearch $featurelist u/e] > -1} {
+    # echoname => localcount map
+    set localcounts [msgdb eval {SELECT `echoname`, COUNT(`id`) FROM `msg` GROUP BY `echoname`;}]
+    foreach ename $echos {
+      if {$ename ne ""} {
+        set localdata ""
+        set localcount 0
+        if {[dict exists $localcounts $ename]} {
+          set localcount [dict get $localcounts $ename]
         }
+        if {$localcount > 12} {
+          set diff 6
+          set needsync 1
+          while {$needsync eq 1} {
+            incr diff $diff
+            set localdata [getfile [string cat $url "/u/e/" $ename "/-$diff:1"]]
+            # control message id
+            set cmsg [string trim [lindex [split $localdata \n] 1]]
+            msgdb eval {SELECT `msgid` FROM `msg` WHERE `msgid` = $cmsg;} row {
+              if {[string trim $row(msgid)] eq $cmsg} {
+                set needsync 0
+              }
+            }
+          }
+          set localdata [getfile [string cat $url "/u/e/" $ename "/-$diff:$diff"]]
+        } else {
+          set localdata [getfile [string cat $url "/u/e/" $ename]]
+        }
+        append datalines [string trim $localdata] \n
       }
     }
-
   } else { # no extended feature support, pass the echo list and fetch the message IDs
     set echodata [getfile [string cat $url "/u/e/" [join $echos "/"]]]
     set datalines [split $echodata \n]