gall: don't reload if code is unchanged

pkg/arvo/sys/vane/clay.hoon

@@ -4342,19 +4342,20 @@
     |-  ^+  sat
     ?~  sat
       ~
-    :_  ^$(sat t.sat)
     ::  for each agent
     ::
-    :-  desk.i.sat
     =/  bil  bill.i.sat
-    |-  ^-  bill
+    =^  this  done
+      |-  ^-  [bill (set dude:gall)]
       ?~  bil
-      ~
+        [~ done]
       ::
       ?:  (~(has in done) i.bil)
         $(bil t.bil)
       =.  done  (~(put in done) i.bil)
-    [i.bil $(bil t.bil)]
+      =^  next  done  $(bil t.bil)
+      [[i.bil next] done]
+    [[desk.i.sat this] $(sat t.sat)]
   ::
   ++  sort-desks
     |=  [a=[=desk *] b=[=desk *]]
@@ -4381,7 +4382,7 @@
       =/  agent  ~|  [%building-app bill.i.sat]  !<(agent:gall vase)
       =^  lid  nub.f  $(bill.i.sat t.bill.i.sat)
       [[[i.bill.i.sat [our desk.i.sat da+now] agent] lid] nub.f]
-    =.  lad  (weld new lad)
+    =.  lad  (weld lad new)
     $(sat t.sat)
   ::  build-dais for each mark
   ::
@@ -4653,10 +4654,11 @@
       [mos ..^$]
     ::
         [%rise =desk =dude:gall on=(unit ?)]
-      =^  mos  ruf
+      =^  m1  ruf
         =/  den  ((de now rof hen ruf) our desk.arg.req)
         abet:(rise:den dude.arg.req on.arg.req)
-      [mos ..^$]
+      =^  m2  ruf  abet:goad:(lu now rof hen ruf)
+      [(weld m1 m2) ..^$]
     ==
   ::
       %tomb  (tomb-clue:tomb hen clue.req)

pkg/arvo/sys/vane/gall.hoon

@@ -47,6 +47,7 @@
 ::    control-duct: TODO document
 ::    stats: TODO document
 ::    watches: incoming and outgoing subscription state
+::    code: most recently loaded code
 ::    agent: agent core
 ::    beak: compilation source
 ::    marks: mark conversion requests
@@ -56,6 +57,7 @@
       nonce=@t
       =stats
       =watches
+      code=*
       agent=(each agent vase)
       =beak
       marks=(map duct mark)
@@ -128,6 +130,7 @@
       nonce=@t
       =stats
       =watches
+      code=~
       old-state=[%| vase]
       =beak
       marks=(map duct mark)
@@ -199,8 +202,11 @@
     ~>  %slog.[0 leaf+"gall: {tex} {<dap>}"]
     ::
     ?^  yak
+      ?:  &(=(q.beak.u.yak q.bek) =(code.u.yak agent) =(-.agent.u.yak &))
+        mo-core
+      ::
       =.  yokes.state
-        (~(put by yokes.state) dap u.yak(beak bek))
+        (~(put by yokes.state) dap u.yak(beak bek, code agent))
       =/  ap-core  (ap-abed:ap dap `our)
       =.  ap-core  (ap-reinstall:ap-core agent)
       =.  mo-core  ap-abet:ap-core
@@ -211,6 +217,7 @@
       %*  .  *yoke
         control-duct  hen
         beak          bek
+        code          agent
         agent         &+agent
         nonce         (scot %uw (end 5 (shas %yoke-nonce eny)))
       ==
@@ -1537,6 +1544,7 @@
   ::
   ::  removed live
   ::  changed old-state from (each vase vase) to [%| vase]
+  ::  added code
   ::
   ++  spore-8-to-9
     |=  old=spore-8
@@ -1546,7 +1554,8 @@
         eggs
       %-  ~(urn by eggs.old)
       |=  [a=term e=egg-8]
-      e(|2 |3.e(old-state [%| p.old-state.e]))
+      ^-  egg
+      e(|2 |3.e(|2 `|5.e(old-state [%| p.old-state.e])))
     ==
   --
 ::  +scry: standard scry
@@ -1635,6 +1644,7 @@
   |=  =yoke
   ^-  egg
   %=    yoke
+      code   ~
       agent
     :-  %|
     ?:  ?=(%| -.agent.yoke)