Add `class Reline::History` and test.

1 files changed, 60 insertions, 0 deletions

diff --git a/lib/reline/history.rb b/lib/reline/history.rb
new file mode 100644
index 0000000000..d988230941
--- /dev/null
+++ b/lib/reline/history.rb
@@ -0,0 +1,60 @@
+class Reline::History < Array
+  def initialize(config)
+    @config = config
+  end
+
+  def to_s
+    'HISTORY'
+  end
+
+  def delete_at(index)
+    index = check_index(index)
+    super(index)
+  end
+
+  def [](index)
+    index = check_index(index)
+    super(index)
+  end
+
+  def []=(index, val)
+    index = check_index(index)
+    super(index, String.new(val, encoding: Encoding::default_external))
+  end
+
+  def concat(*val)
+    val.each do |v|
+      push(*v)
+    end
+  end
+
+  def push(*val)
+    diff = size + val.size - @config.history_size
+    if diff > 0
+      if diff <= size
+        shift(diff)
+      else
+        diff -= size
+        clear
+        val.shift(diff)
+      end
+    end
+    super(*(val.map{ |v| String.new(v, encoding: Encoding::default_external) }))
+  end
+
+  def <<(val)
+    shift if size + 1 > @config.history_size
+    super(String.new(val, encoding: Encoding::default_external))
+  end
+
+  private def check_index(index)
+    index += size if index < 0
+    raise RangeError.new("index=<#{index}>") if index < -@config.history_size or @config.history_size < index
+    raise IndexError.new("index=<#{index}>") if index < 0 or size <= index
+    index
+  end
+
+  private def set_config(config)
+    @config = config
+  end
+end