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Minimal Twitter search function

A simple Twitter search function, leveraging the JSON type provider.

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type T = FSharp.Data.JsonProvider<"http://search.twitter.com/search.json?q=%23fsharp&lang=en&rpp=1&page=1">
let tweets (tag : string) (since : System.DateTime) =
    let enc = System.Web.HttpUtility.UrlEncode : string -> string
    let rec page n =        
        let data = T.Load(sprintf "http://search.twitter.com/search.json?q=%s&rpp=100&page=%d&since=%4d-%02d-%02d" (enc tag) n since.Year since.Month since.Day)
        seq{
            yield! data.Results
            if not (Seq.isEmpty data.Results) then yield! page (n + 1)
        }
    page 1

// usage
tweets "#fsharp" (System.DateTime.Parse("5/17/2013"))
|> Seq.iter ( fun t -> printfn "%-21O %-15s %s" t.CreatedAt t.FromUser t.Text )
type T = obj

Full name: Script.T
Multiple items
namespace FSharp

--------------------
namespace Microsoft.FSharp
Multiple items
namespace FSharp.Data

--------------------
namespace Microsoft.FSharp.Data
type JsonProvider

Full name: FSharp.Data.JsonProvider


<summary>Typed representation of a JSON document.</summary>
       <param name='Sample'>Location of a JSON sample file or a string containing a sample JSON document.</param>
       <param name='SampleIsList'>If true, sample should be a list of individual samples for the inference.</param>
       <param name='RootName'>The name to be used to the root type. Defaults to `Root`.</param>
       <param name='Culture'>The culture used for parsing numbers and dates. Defaults to the invariant culture.</param>
       <param name='Encoding'>The encoding used to read the sample. You can specify either the character set name or the codepage number. Defaults to UTF8 for files, and to ISO-8859-1 the for HTTP requests, unless `charset` is specified in the `Content-Type` response header.</param>
       <param name='ResolutionFolder'>A directory that is used when resolving relative file references (at design time and in hosted execution).</param>
       <param name='EmbeddedResource'>When specified, the type provider first attempts to load the sample from the specified resource
          (e.g. 'MyCompany.MyAssembly, resource_name.json'). This is useful when exposing types generated by the type provider.</param>
       <param name='InferTypesFromValues'>If true, turns on additional type inference from values.
          (e.g. type inference infers string values such as "123" as ints and values constrained to 0 and 1 as booleans.)</param>
val tweets : tag:string -> since:System.DateTime -> seq<'a>

Full name: Script.tweets
val tag : string
Multiple items
val string : value:'T -> string

Full name: Microsoft.FSharp.Core.Operators.string

--------------------
type string = System.String

Full name: Microsoft.FSharp.Core.string
val since : System.DateTime
namespace System
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

Full name: System.DateTime

--------------------
System.DateTime()
   (+0 other overloads)
System.DateTime(ticks: int64) : unit
   (+0 other overloads)
System.DateTime(ticks: int64, kind: System.DateTimeKind) : unit
   (+0 other overloads)
System.DateTime(year: int, month: int, day: int) : unit
   (+0 other overloads)
System.DateTime(year: int, month: int, day: int, calendar: System.Globalization.Calendar) : unit
   (+0 other overloads)
System.DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int) : unit
   (+0 other overloads)
System.DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, kind: System.DateTimeKind) : unit
   (+0 other overloads)
System.DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, calendar: System.Globalization.Calendar) : unit
   (+0 other overloads)
System.DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, millisecond: int) : unit
   (+0 other overloads)
System.DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, millisecond: int, kind: System.DateTimeKind) : unit
   (+0 other overloads)
val enc : (string -> string)
namespace System.Web
Multiple items
type HttpUtility =
  new : unit -> HttpUtility
  static member HtmlAttributeEncode : s:string -> string + 1 overload
  static member HtmlDecode : s:string -> string + 1 overload
  static member HtmlEncode : s:string -> string + 2 overloads
  static member JavaScriptStringEncode : value:string -> string + 1 overload
  static member ParseQueryString : query:string -> NameValueCollection + 1 overload
  static member UrlDecode : str:string -> string + 3 overloads
  static member UrlDecodeToBytes : str:string -> byte[] + 3 overloads
  static member UrlEncode : str:string -> string + 3 overloads
  static member UrlEncodeToBytes : str:string -> byte[] + 3 overloads
  ...

Full name: System.Web.HttpUtility

--------------------
System.Web.HttpUtility() : unit
System.Web.HttpUtility.UrlEncode(bytes: byte []) : string
System.Web.HttpUtility.UrlEncode(str: string) : string
System.Web.HttpUtility.UrlEncode(str: string, e: System.Text.Encoding) : string
System.Web.HttpUtility.UrlEncode(bytes: byte [], offset: int, count: int) : string
val page : (int -> seq<'b>)
val n : int
val data : obj
val sprintf : format:Printf.StringFormat<'T> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.sprintf
property System.DateTime.Year: int
property System.DateTime.Month: int
property System.DateTime.Day: int
Multiple items
val seq : sequence:seq<'T> -> seq<'T>

Full name: Microsoft.FSharp.Core.Operators.seq

--------------------
type seq<'T> = System.Collections.Generic.IEnumerable<'T>

Full name: Microsoft.FSharp.Collections.seq<_>
val not : value:bool -> bool

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

from Microsoft.FSharp.Collections
val isEmpty : source:seq<'T> -> bool

Full name: Microsoft.FSharp.Collections.Seq.isEmpty
System.DateTime.Parse(s: string) : System.DateTime
System.DateTime.Parse(s: string, provider: System.IFormatProvider) : System.DateTime
System.DateTime.Parse(s: string, provider: System.IFormatProvider, styles: System.Globalization.DateTimeStyles) : System.DateTime
val iter : action:('T -> unit) -> source:seq<'T> -> unit

Full name: Microsoft.FSharp.Collections.Seq.iter
val t : obj
val printfn : format:Printf.TextWriterFormat<'T> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.printfn
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More information

Link:http://fssnip.net/iu
Posted:4 years ago
Author:Lincoln Atkinson
Tags: twitter , type provider , json