This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

Reline::LineEditor::Dialog 

        # Reline::LineEditor::Dialog < Object

(from ruby core)
---
# Class methods:

    new

# Instance methods:

    call
    column
    contents
    contents=
    lines_backup
    name
    pointer
    scroll_top
    scrollbar_pos
    set_cursor_pos
    trap_key
    vertical_offset
    width
    width=

# Attributes:

    attr_accessor column
    attr_accessor lines_backup
    attr_accessor pointer
    attr_accessor scroll_top
    attr_accessor scrollbar_pos
    attr_accessor trap_key
    attr_accessor vertical_offset
    attr_reader contents
    attr_reader name
    attr_reader width

(from gem reline-0.3.2)
---
# Class methods:

    new

# Instance methods:

    call
    column
    contents
    contents=
    lines_backup
    name
    pointer
    scroll_top
    scrollbar_pos
    set_cursor_pos
    trap_key
    vertical_offset
    width
    width=

# Attributes:

    attr_accessor column
    attr_accessor lines_backup
    attr_accessor pointer
    attr_accessor scroll_top
    attr_accessor scrollbar_pos
    attr_accessor trap_key
    attr_accessor vertical_offset
    attr_reader contents
    attr_reader name
    attr_reader width

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.