Add Random.next_bool and .next_int (#16297)

First step for internalizing `Random::DEFAULT`.

Author: ysbaddaden

samples/sdl/tv.cr

@@ -64,7 +64,7 @@ class ColorMaker
   end
 
   def make_alpha_color(multiplier)
-    rand = Random::DEFAULT.next_int
+    rand = Random.next_int
     r = ((rand >> 16) % 256).to_i
     g = ((rand >> 8) % 256).to_i
     b = (rand % 256).to_i

spec/std/random_spec.cr

@@ -196,7 +196,11 @@ describe "Random" do
   end
 
   it "gets a random bool" do
-    Random::DEFAULT.next_bool.should be_a(Bool)
+    Random.next_bool.should be_a(Bool)
+  end
+
+  it "gets a random int" do
+    Random.next_int.should be_a(Int32)
   end
 
   it "generates by accumulation" do

src/colorize.cr

@@ -91,7 +91,7 @@
 # ```
 # require "colorize"
 #
-# "foo".colorize(Random::DEFAULT.next_bool ? :green : :default)
+# "foo".colorize(Random.next_bool ? :green : :default)
 # ```
 #
 # Available colors are:

src/http/web_socket/protocol.cr

@@ -136,7 +136,7 @@ class HTTP::WebSocket::Protocol
   private def write_payload(data)
     return @io.write(data) unless @masked
 
-    key = Random::DEFAULT.next_int
+    key = Random.next_int
     mask_array = key.unsafe_as(StaticArray(UInt8, 4))
     @io.write mask_array.to_slice
 

src/random.cr

@@ -426,6 +426,16 @@ module Random
     random_bytes(n).hexstring
   end
 
+  # See `#next_bool`.
+  def self.next_bool : Bool
+    DEFAULT.next_bool
+  end
+
+  # See `#next_int`.
+  def self.next_int : Int32
+    DEFAULT.next_int
+  end
+
   # See `#rand`.
   def self.rand : Float64
     DEFAULT.rand