Check Outlook only once an hour

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open System
open System.Diagnostics
open System.Runtime.InteropServices

let getOutlook() = Process.GetProcessesByName "OUTLOOK" |> Seq.toList

[<DllImport "user32.dll">]
extern void SetForegroundWindow(IntPtr hWnd)

let (|Exited|_|) (p: Process) =
    if p.HasExited then Some()
    else None

let (|Hidden|_|) (p: Process) =
    if p.MainWindowHandle = 0n then Some()
    else None

let start =
    let rec waitForExit () =
        async {
            do! Async.Sleep 10000

            return!
                match getOutlook() with
                | [] | Exited :: _ -> sleep()
                | _ -> waitForExit()
        }
    and sleep () =
        async {
            do! Async.Sleep (60 * 60 * 1000)
        
            match getOutlook() with
            | [] | (Hidden | Exited) :: _ ->
                async {
                    use p = Process.Start "OUTLOOK"
                    while not p.HasExited do
                        do! Async.Sleep 10000
                }
                |> Async.Start
            | p :: _ ->
                SetForegroundWindow p.MainWindowHandle

            return! waitForExit()
        }
    waitForExit >> Async.RunSynchronously

[<System.STAThread>]
do  start()

#if INTERACTIVE
let (++) a b = System.IO.Path.Combine(a, b)
let source = __SOURCE_DIRECTORY__ ++ __SOURCE_FILE__
let args = sprintf "--target:winexe %s -o:%s" source <| source.Replace("fsx", "exe")
System.Diagnostics.Process.Start(System.AppDomain.CurrentDomain.BaseDirectory ++ "fsc", args)
#endif

namespace System

namespace System.Diagnostics

namespace System.Runtime

namespace System.Runtime.InteropServices

val getOutlook : unit -> Process list

Full name: Script.getOutlook

Multiple items
type Process =
  inherit Component
  new : unit -> Process
  member BasePriority : int
  member BeginErrorReadLine : unit -> unit
  member BeginOutputReadLine : unit -> unit
  member CancelErrorRead : unit -> unit
  member CancelOutputRead : unit -> unit
  member Close : unit -> unit
  member CloseMainWindow : unit -> bool
  member EnableRaisingEvents : bool with get, set
  member ExitCode : int
  ...

Full name: System.Diagnostics.Process

--------------------
Process() : unit

Process.GetProcessesByName(processName: string) : Process []
Process.GetProcessesByName(processName: string, machineName: string) : Process []

module Seq

from Microsoft.FSharp.Collections

val toList : source:seq<'T> -> 'T list

Full name: Microsoft.FSharp.Collections.Seq.toList

Multiple items
type DllImportAttribute =
  inherit Attribute
  new : dllName:string -> DllImportAttribute
  val EntryPoint : string
  val CharSet : CharSet
  val SetLastError : bool
  val ExactSpelling : bool
  val PreserveSig : bool
  val CallingConvention : CallingConvention
  val BestFitMapping : bool
  val ThrowOnUnmappableChar : bool
  member Value : string

Full name: System.Runtime.InteropServices.DllImportAttribute

--------------------
DllImportAttribute(dllName: string) : unit

val SetForegroundWindow : hWnd:IntPtr -> unit

Full name: Script.SetForegroundWindow

Multiple items
type IntPtr =
  struct
    new : value:int -> nativeint + 2 overloads
    member Equals : obj:obj -> bool
    member GetHashCode : unit -> int
    member ToInt32 : unit -> int
    member ToInt64 : unit -> int64
    member ToPointer : unit -> unit
    member ToString : unit -> string + 1 overload
    static val Zero : nativeint
    static member Add : pointer:nativeint * offset:int -> nativeint
    static member Size : int
    ...
  end

Full name: System.IntPtr

--------------------
IntPtr()
IntPtr(value: int) : unit
IntPtr(value: int64) : unit
IntPtr(value: nativeptr<unit>) : unit

val hWnd : IntPtr

val p : Process

property Process.HasExited: bool

union case Option.Some: Value: 'T -> Option<'T>

union case Option.None: Option<'T>

property Process.MainWindowHandle: nativeint

val start : (unit -> unit)

Full name: Script.start

val waitForExit : (unit -> Async<'a>)

val async : AsyncBuilder

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.async

Multiple items
type Async
static member AsBeginEnd : computation:('Arg -> Async<'T>) -> ('Arg * AsyncCallback * obj -> IAsyncResult) * (IAsyncResult -> 'T) * (IAsyncResult -> unit)
static member AwaitEvent : event:IEvent<'Del,'T> * ?cancelAction:(unit -> unit) -> Async<'T> (requires delegate and 'Del :> Delegate)
static member AwaitIAsyncResult : iar:IAsyncResult * ?millisecondsTimeout:int -> Async<bool>
static member AwaitTask : task:Task<'T> -> Async<'T>
static member AwaitWaitHandle : waitHandle:WaitHandle * ?millisecondsTimeout:int -> Async<bool>
static member CancelDefaultToken : unit -> unit
static member Catch : computation:Async<'T> -> Async<Choice<'T,exn>>
static member FromBeginEnd : beginAction:(AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromBeginEnd : arg:'Arg1 * beginAction:('Arg1 * AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromBeginEnd : arg1:'Arg1 * arg2:'Arg2 * beginAction:('Arg1 * 'Arg2 * AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromBeginEnd : arg1:'Arg1 * arg2:'Arg2 * arg3:'Arg3 * beginAction:('Arg1 * 'Arg2 * 'Arg3 * AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromContinuations : callback:(('T -> unit) * (exn -> unit) * (OperationCanceledException -> unit) -> unit) -> Async<'T>
static member Ignore : computation:Async<'T> -> Async<unit>
static member OnCancel : interruption:(unit -> unit) -> Async<IDisposable>
static member Parallel : computations:seq<Async<'T>> -> Async<'T []>
static member RunSynchronously : computation:Async<'T> * ?timeout:int * ?cancellationToken:CancellationToken -> 'T
static member Sleep : millisecondsDueTime:int -> Async<unit>
static member Start : computation:Async<unit> * ?cancellationToken:CancellationToken -> unit
static member StartAsTask : computation:Async<'T> * ?taskCreationOptions:TaskCreationOptions * ?cancellationToken:CancellationToken -> Task<'T>
static member StartChild : computation:Async<'T> * ?millisecondsTimeout:int -> Async<Async<'T>>
static member StartChildAsTask : computation:Async<'T> * ?taskCreationOptions:TaskCreationOptions -> Async<Task<'T>>
static member StartImmediate : computation:Async<unit> * ?cancellationToken:CancellationToken -> unit
static member StartWithContinuations : computation:Async<'T> * continuation:('T -> unit) * exceptionContinuation:(exn -> unit) * cancellationContinuation:(OperationCanceledException -> unit) * ?cancellationToken:CancellationToken -> unit
static member SwitchToContext : syncContext:SynchronizationContext -> Async<unit>
static member SwitchToNewThread : unit -> Async<unit>
static member SwitchToThreadPool : unit -> Async<unit>
static member TryCancelled : computation:Async<'T> * compensation:(OperationCanceledException -> unit) -> Async<'T>
static member CancellationToken : Async<CancellationToken>
static member DefaultCancellationToken : CancellationToken

Full name: Microsoft.FSharp.Control.Async

--------------------
type Async<'T>

Full name: Microsoft.FSharp.Control.Async<_>

static member Async.Sleep : millisecondsDueTime:int -> Async<unit>

active recognizer Exited: Process -> unit option

Full name: Script.( |Exited|_| )

val sleep : (unit -> Async<'a>)

active recognizer Hidden: Process -> unit option

Full name: Script.( |Hidden|_| )

Process.Start(startInfo: ProcessStartInfo) : Process
Process.Start(fileName: string) : Process
Process.Start(fileName: string, arguments: string) : Process
Process.Start(fileName: string, userName: string, password: Security.SecureString, domain: string) : Process
Process.Start(fileName: string, arguments: string, userName: string, password: Security.SecureString, domain: string) : Process

val not : value:bool -> bool

Full name: Microsoft.FSharp.Core.Operators.not

static member Async.Start : computation:Async<unit> * ?cancellationToken:Threading.CancellationToken -> unit

static member Async.RunSynchronously : computation:Async<'T> * ?timeout:int * ?cancellationToken:Threading.CancellationToken -> 'T

Multiple items
type STAThreadAttribute =
  inherit Attribute
  new : unit -> STAThreadAttribute

Full name: System.STAThreadAttribute

--------------------
STAThreadAttribute() : unit