Class: IRB::History
Overview
Represents history of results of previously evaluated commands.
Available via __
variable, only if IRB.conf[:EVAL_HISTORY]
or IRB::CurrentContext().eval_history
is non-nil integer value (by default it is nil
).
Example (in ‘irb`):
# Initialize history
IRB::CurrentContext().eval_history = 10
# => 10
# Perform some commands...
1 + 2
# => 3
puts 'x'
# x
# => nil
raise RuntimeError
# ...error raised
# Inspect history (format is "<item number> <evaluated value>":
__
# => 1 10
# 2 3
# 3 nil
__[1]
# => 10
Instance Method Summary collapse
-
#[](idx) ⇒ Object
Get one item of the content (both positive and negative indexes work).
-
#initialize(size = 16) ⇒ History
constructor
:nodoc:.
-
#inspect ⇒ Object
:nodoc:.
-
#push(no, val) ⇒ Object
:nodoc:.
- #real_inspect ⇒ Object
-
#size(size) ⇒ Object
:nodoc:.
Constructor Details
#initialize(size = 16) ⇒ History
:nodoc:
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# File 'lib/irb/ext/history.rb', line 100 def initialize(size = 16) # :nodoc: @size = size @contents = [] end |
Instance Method Details
#[](idx) ⇒ Object
Get one item of the content (both positive and negative indexes work).
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# File 'lib/irb/ext/history.rb', line 113 def [](idx) begin if idx >= 0 @contents.find{|no, val| no == idx}[1] else @contents[idx][1] end rescue NameError nil end end |
#inspect ⇒ Object
:nodoc:
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# File 'lib/irb/ext/history.rb', line 132 def inspect # :nodoc: if @contents.empty? return real_inspect end unless (last = @contents.pop)[1].equal?(self) @contents.push last last = nil end str = @contents.collect{|no, val| if val.equal?(self) "#{no} ...self-history..." else "#{no} #{val.inspect}" end }.join("\n") if str == "" str = "Empty." end @contents.push last if last str end |
#push(no, val) ⇒ Object
:nodoc:
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# File 'lib/irb/ext/history.rb', line 125 def push(no, val) # :nodoc: @contents.push [no, val] @contents.shift if @size != 0 && @contents.size > @size end |
#real_inspect ⇒ Object
130 |
# File 'lib/irb/ext/history.rb', line 130 alias real_inspect inspect |
#size(size) ⇒ Object
:nodoc:
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# File 'lib/irb/ext/history.rb', line 105 def size(size) # :nodoc: if size != 0 && size < @size @contents = @contents[@size - size .. @size] end @size = size end |