Cosmetic improvements to the status bar; Attempt to fix the CI

beacon_chain/beacon_node.nim

@@ -865,6 +865,11 @@ when hasPrompt:
       else:
         p[].writeLine("Unknown command: " & cmd)
 
+  proc slotOrZero(time: BeaconTime): Slot =
+    let exSlot = time.toSlot
+    if exSlot.afterGenesis: exSlot.slot
+    else: Slot(0)
+
   proc initPrompt(node: BeaconNode) =
     if isatty(stdout) and node.config.statusbar:
       enableTrueColors()
@@ -892,7 +897,21 @@ when hasPrompt:
         of "last_finalized_epoch":
           var head = node.blockPool.finalizedHead
           # TODO: Should we display a state root instead?
-          $(head.slot) & "(" & shortLog(head.blck.root) & ")"
+          $(head.slot.epoch) & " (" & shortLog(head.blck.root) & ")"
+
+        of "epoch":
+          $node.beaconClock.now.slotOrZero.epoch
+
+        of "epoch_slot":
+          $(node.beaconClock.now.slotOrZero mod SLOTS_PER_EPOCH)
+
+        of "slots_per_epoch":
+          $SLOTS_PER_EPOCH
+
+        of "slot_trailing_digits":
+          var slotStr = $node.beaconClock.now.slotOrZero
+          if slotStr.len > 3: slotStr = slotStr[^3..^1]
+          slotStr
 
         of "attached_validators_balance":
           var balance = uint64(0)

beacon_chain/conf.nim

@@ -54,7 +54,9 @@ type
 
     statusbarContents* {.
       desc: ""
-      defaultValue: "peers: $connected_peers; finalized epoch: $last_finalized_epoch |" &
+      defaultValue: "peers: $connected_peers; " &
+                    "epoch: $epoch, slot: $epoch_slot/$slots_per_epoch (..$slot_trailing_digits); " &
+                    "finalized epoch: $last_finalized_epoch |" &
                     "ETH: $attached_validators_balance" }: string
 
     case cmd* {.

beacon_chain/spec/helpers.nim

@@ -68,6 +68,9 @@ func compute_epoch_of_slot*(slot: Slot|uint64): Epoch =
   # Return the epoch number of the given ``slot``.
   (slot div SLOTS_PER_EPOCH).Epoch
 
+template epoch*(slot: Slot): Epoch =
+  compute_epoch_of_slot(slot)
+
 # https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#compute_start_slot_of_epoch
 func compute_start_slot_of_epoch*(epoch: Epoch): Slot =
   # Return the start slot of ``epoch``.

nim.cfg

@@ -11,6 +11,9 @@
   --passL:"-Wl,--stack,8388608"
   # https://github.com/nim-lang/Nim/issues/4057
   --tlsEmulation:off
+  # The dynamic Chronicles output currently prevents us from using colors on Windows
+  # because these require direct manipulations of the stdout File object.
+  -d:"chronicles_colors=off"
 @end
 
 @if testnet_docker_node: