F# Logging Module

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module Log =
    open System
    open System.IO
    
    let private logDir = "logs"
    
    let private log kind fmt =
        Printf.kprintf (fun s ->
            let now = DateTime.Now
            let msg = sprintf "[%s] [%s] %s" (now.ToString("s")) kind s
            let filename =
                Path.Combine (
                    __SOURCE_DIRECTORY__,
                    logDir,
                    sprintf "%s.log" (now.ToString("yyyy-MM-dd")))

            Directory.CreateDirectory (Path.GetDirectoryName(filename)) |> ignore

            File.AppendAllLines (filename, [|msg|])

            printfn "%s" msg) fmt

    let fail fmt = log "Fail" fmt

    let info fmt = log "Info" fmt

namespace System

namespace System.IO

val private logDir : string

val private log : kind:string -> fmt:Printf.StringFormat<'a,unit> -> 'a

val kind : string

val fmt : Printf.StringFormat<'a,unit>

module Printf

from Microsoft.FSharp.Core

val kprintf : continuation:(string -> 'Result) -> format:Printf.StringFormat<'T,'Result> -> 'T

val s : string

val now : DateTime

Multiple items
type DateTime =
  struct
    new : ticks:int64 -> DateTime + 10 overloads
    member Add : value:TimeSpan -> DateTime
    member AddDays : value:float -> DateTime
    member AddHours : value:float -> DateTime
    member AddMilliseconds : value:float -> DateTime
    member AddMinutes : value:float -> DateTime
    member AddMonths : months:int -> DateTime
    member AddSeconds : value:float -> DateTime
    member AddTicks : value:int64 -> DateTime
    member AddYears : value:int -> DateTime
    ...
  end

--------------------
DateTime ()
   (+0 other overloads)
DateTime(ticks: int64) : DateTime
   (+0 other overloads)
DateTime(ticks: int64, kind: DateTimeKind) : DateTime
   (+0 other overloads)
DateTime(year: int, month: int, day: int) : DateTime
   (+0 other overloads)
DateTime(year: int, month: int, day: int, calendar: Globalization.Calendar) : DateTime
   (+0 other overloads)
DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int) : DateTime
   (+0 other overloads)
DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, kind: DateTimeKind) : DateTime
   (+0 other overloads)
DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, calendar: Globalization.Calendar) : DateTime
   (+0 other overloads)
DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, millisecond: int) : DateTime
   (+0 other overloads)
DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, millisecond: int, kind: DateTimeKind) : DateTime
   (+0 other overloads)

property DateTime.Now: DateTime with get

val msg : string

val sprintf : format:Printf.StringFormat<'T> -> 'T

val filename : string

type Path =
  static val DirectorySeparatorChar : char
  static val AltDirectorySeparatorChar : char
  static val VolumeSeparatorChar : char
  static val PathSeparator : char
  static val InvalidPathChars : char[]
  static member ChangeExtension : path:string * extension:string -> string
  static member Combine : [<ParamArray>] paths:string[] -> string + 3 overloads
  static member EndsInDirectorySeparator : path:ReadOnlySpan<char> -> bool + 1 overload
  static member GetDirectoryName : path:string -> string + 1 overload
  static member GetExtension : path:string -> string + 1 overload
  ...

Path.Combine([<ParamArray>] paths: string []) : string
Path.Combine(path1: string, path2: string) : string
Path.Combine(path1: string, path2: string, path3: string) : string
Path.Combine(path1: string, path2: string, path3: string, path4: string) : string

type Directory =
  static member CreateDirectory : path:string -> DirectoryInfo
  static member Delete : path:string -> unit + 1 overload
  static member EnumerateDirectories : path:string -> IEnumerable<string> + 3 overloads
  static member EnumerateFileSystemEntries : path:string -> IEnumerable<string> + 3 overloads
  static member EnumerateFiles : path:string -> IEnumerable<string> + 3 overloads
  static member Exists : path:string -> bool
  static member GetCreationTime : path:string -> DateTime
  static member GetCreationTimeUtc : path:string -> DateTime
  static member GetCurrentDirectory : unit -> string
  static member GetDirectories : path:string -> string[] + 3 overloads
  ...

Directory.CreateDirectory(path: string) : DirectoryInfo

Path.GetDirectoryName(path: ReadOnlySpan<char>) : ReadOnlySpan<char>
Path.GetDirectoryName(path: string) : string

val ignore : value:'T -> unit

type File =
  static member AppendAllLines : path:string * contents:IEnumerable<string> -> unit + 1 overload
  static member AppendAllLinesAsync : path:string * contents:IEnumerable<string> * ?cancellationToken:CancellationToken -> Task + 1 overload
  static member AppendAllText : path:string * contents:string -> unit + 1 overload
  static member AppendAllTextAsync : path:string * contents:string * ?cancellationToken:CancellationToken -> Task + 1 overload
  static member AppendText : path:string -> StreamWriter
  static member Copy : sourceFileName:string * destFileName:string -> unit + 1 overload
  static member Create : path:string -> FileStream + 2 overloads
  static member CreateText : path:string -> StreamWriter
  static member Decrypt : path:string -> unit
  static member Delete : path:string -> unit
  ...

File.AppendAllLines(path: string, contents: Collections.Generic.IEnumerable<string>) : unit
File.AppendAllLines(path: string, contents: Collections.Generic.IEnumerable<string>, encoding: Text.Encoding) : unit

val printfn : format:Printf.TextWriterFormat<'T> -> 'T

val fail : fmt:Printf.StringFormat<'a,unit> -> 'a

val info : fmt:Printf.StringFormat<'a,unit> -> 'a