Split irb config into separate files.

Based on code from @joshuaclayton:
https://github.com/joshuaclayton/dotfiles/tree/master/irbrc.d

irbrc

@@ -3,19 +3,10 @@ require 'pp'
 
 IRB.conf[:AUTO_INDENT] = true
 
-class Array
-  def self.toy
-    [1, 2, 3] + %w(a b c)
+def require_rb_files_from(dir)
+  Dir.glob(File.join(dir, '*.rb')) do |file|
+    require file
   end
 end
 
-class Hash
-  def self.toy
-    {
-      1 => 2
-      'a' => 'b',
-      'foo' => 'bar',
-      :hello => 'there'
-    }
-  end
-end
+require_rb_files_from(File.join(ENV['HOME'], '.irbrc.d'))

irbrc.d/completion.rb

@@ -0,0 +1 @@
+require 'irb/completion'

irbrc.d/core_extensions.rb

@@ -0,0 +1,16 @@
+class Array
+  def self.toy
+    [1, 2, 3] + %w(a b c)
+  end
+end
+
+class Hash
+  def self.toy
+    {
+      1 => 2
+      'a' => 'b',
+      'foo' => 'bar',
+      :hello => 'there'
+    }
+  end
+end

irbrc.d/history.rb

@@ -0,0 +1,24 @@
+IRB.conf[:USE_READLINE] = true
+
+module Readline
+  module History
+    LOG = "#{ENV["HOME"]}/.irb-save-history"
+    def self.write_log(line)
+      File.open(LOG, 'ab') {|f| f << "#{line}\n"} unless line == "exit"
+    end
+  end
+
+  alias :old_readline :readline
+  def readline(*args)
+    ln = old_readline(*args)
+    begin
+      History.write_log(ln)
+    rescue
+    end
+    ln
+  end
+end
+
+require 'irb/ext/save-history'
+IRB.conf[:SAVE_HISTORY] = 1000
+IRB.conf[:HISTORY_FILE] = "#{ENV["HOME"]}/.irb-save-history"