tests/async/tgeneric_async.nim


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discard """
output: "1\nmessa"
"""

import async

# bug #2377
proc test[T](v: T) {.async.} =
  echo $v

asyncCheck test[int](1)

# More complex case involving typedesc and static params
type
  SomeMsg = object
    data: string

template msgId(M: type SomeMsg): int = 1

proc recvMsg(): Future[tuple[msgId: int, msgData: string]] {.async.} =
  return (1, "message")

proc read(data: string, T: type SomeMsg, maxBytes: int): T =
  result.data = data[0 ..< min(data.len, maxBytes)]

proc nextMsg*(MsgType: typedesc,
              maxBytes: static[int]): Future[MsgType] {.async.} =
  const wantedId = MsgType.msgId

  while true:
    var (nextMsgId, nextMsgData) = await recvMsg()
    if nextMsgId == wantedId:
      return nextMsgData.read(MsgType, maxBytes)

proc main {.async.} =
  let msg = await nextMsg(SomeMsg, 5)
  echo msg.data

asyncCheck main()
Required for next Release

   (X) #5   09/07/17  avoid using shell calls, it results in many problems
               can't answer questions of spawned processes
               specifically rm with write-protected files
   (X) #8   09/07/17  Clear keybuffer after executing programs.
               you may have typed something after the program stopped reading
               this could flush the text to ranger and result in unwanted actions
   (X) #14  09/07/18  Sorting sometimes doesn't work
   (X) #17  09/07/19  shell behaves strangely sometimes when run with s key


Critical Issues

   (X) #8   09/07/17  Clear keybuffer after executing programs.
               you may have typed something after the program stopped reading
               this could flush the text to ranger and result in unwanted actions
   ( ) #15  09/07/18  it's way too slow in large directories
               redesign process of getting data from file system
   (X) #17  09/07/19  shell behaves strangely sometimes when run with s key


Minor Issues

   (X) #5   09/07/17  avoid using shell calls, it results in many problems
               can't answer questions of spawned processes
               specifically rm with write-protected files
   (X) #12  09/07/17  sync @marked with changes in on the file system
               if files are deleted, delete those from @marked too
   (X) #14  09/07/18  Sorting sometimes doesn't work
   (X) #16  09/07/19  incorrect pointer in the columns after sorting
   ( ) #18  09/07/19  abbreviate path at the top
   (X) #23  09/07/19  key combination rAr does not work


Features

   ( ) #1   09/07/17  undo key (work in progress)
   ( ) #2   09/07/17  throbber that shows activity
   ( ) #3   09/07/17  colors and attributes in help
   ( ) #6   09/07/17  allow use of sudo somehow
   ( ) #7   09/07/17  allow to change rights and owners easily
   ( ) #9   09/07/17  build an abstract layer for file system operations
               this would encourage the addition of ftp or ssh protocols
   ( ) #11  09/07/17  specify flags at data/types.rb
   ( ) #13  09/07/17  special keys for quick navigation
               cycle in a certain order, like creation-time, newest first.
   ( ) #19  09/07/19  make path clickable
   ( ) #20  09/07/19  accelerate mouse wheel scrolling after a while
   ( ) #21  09/07/19  what about a CONSOLE
   ( ) #22  09/07/19  tab-completition for filenames


Aesthetics

   ( ) #4   09/07/17  consider using optparse
   ( ) #10  09/07/17  Debug module as an IO stream, for redirection of STDERR