Data commit

Task/Rendezvous/Nim/rendezvous.nim

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+import asyncdispatch, options, strutils
+type
+  Printer = ref object
+    inkLevel, id: int
+    backup: Option[Printer]
+  OutOfInkException = object of IOError
+proc print(p: Printer, line: string){.async.} =
+  if p.inkLevel <= 0:
+    if p.backup.isNone():
+      raise newException(OutOfInkException, "out of ink")
+    else:
+      await p.backup.get().print(line)
+  else:
+    p.inkLevel-=1
+    stdout.writeLine("$1:$2".format(p.id, line))
+    await sleepAsync(100)
+proc newPrinter(inkLevel, id: int, backup: Option[Printer]): Printer =
+  new(result)
+  result.inkLevel = inkLevel
+  result.id = id
+  result.backup = backup
+
+proc print(p: Printer, msg: seq[string]){.async.} =
+  for line in msg:
+    try:
+      await p.print(line)
+    except OutOfInkException as e:
+      echo("out of ink")
+      break
+const
+  humptyLines = @[
+    "Humpty Dumpty sat on a wall.",
+    "Humpty Dumpty had a great fall.",
+    "All the king's horses and all the king's men,",
+    "Couldn't put Humpty together again.",
+    ]
+  gooseLines = @[
+        "Old Mother Goose,",
+        "When she wanted to wander,",
+        "Would ride through the air,",
+        "On a very fine gander.",
+        "Jack's mother came in,",
+        "And caught the goose soon,",
+        "And mounting its back,",
+        "Flew up to the moon.",
+    ]
+proc main(){.async.} =
+  var
+    reservePrinter = newPrinter(5, 2, none(Printer))
+    mainPrinter = newPrinter(5, 1, some(reservePrinter))
+  await mainPrinter.print(gooseLines) and mainPrinter.print(humptyLines)
+
+waitFor main()