158 lines
2.5 KiB
Ruby
158 lines
2.5 KiB
Ruby
#
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# irb/input-method.rb - input methods using irb
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# $Release Version: 0.9$
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# $Revision$
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# $Date$
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# by Keiju ISHITSUKA(keiju@ishitsuka.com)
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#
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# --
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#
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#
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#
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module IRB
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#
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# InputMethod
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# StdioInputMethod
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# FileInputMethod
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# (ReadlineInputMethod)
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#
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STDIN_FILE_NAME = "(line)"
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class InputMethod
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@RCS_ID='-$Id$-'
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def initialize(file = STDIN_FILE_NAME)
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@file_name = file
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end
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attr_reader :file_name
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attr_accessor :prompt
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def gets
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IRB.fail NotImplementedError, "gets"
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end
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public :gets
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def readable_atfer_eof?
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false
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end
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end
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class StdioInputMethod < InputMethod
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def initialize
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super
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@line_no = 0
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@line = []
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end
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def gets
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print @prompt
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@line[@line_no += 1] = $stdin.gets
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end
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def eof?
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$stdin.eof?
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end
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def readable_atfer_eof?
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true
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end
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def line(line_no)
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@line[line_no]
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end
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end
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class FileInputMethod < InputMethod
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def initialize(file)
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super
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@io = open(file)
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end
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attr_reader :file_name
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def eof?
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@io.eof?
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end
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def gets
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print @prompt
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l = @io.gets
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# print @prompt, l
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l
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end
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end
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begin
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require "readline"
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class ReadlineInputMethod < InputMethod
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include Readline
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def ReadlineInputMethod.create_finalizer(hist, file)
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proc do
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if num = IRB.conf[:SAVE_HISTORY] and (num = num.to_i) > 0
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if hf = IRB.conf[:HISTORY_FILE]
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file = File.expand_path(hf)
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end
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if file
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open(file, 'w' ) do |f|
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hist = hist.to_a
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f.puts(hist[-num..-1] || hist)
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end
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end
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end
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end
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end
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def initialize
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super
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@line_no = 0
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@line = []
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@eof = false
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loader = proc {|f| f.each {|l| HISTORY << l.chomp}}
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if hist = IRB.conf[:HISTORY_FILE]
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hist = File.expand_path(hist)
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begin
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open(hist, &loader)
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rescue
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end
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else
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IRB.rc_files("_history") do |hist|
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begin
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open(hist, &loader)
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rescue
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hist = nil
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else
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break
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end
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end
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end
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ObjectSpace.define_finalizer(self, ReadlineInputMethod.create_finalizer(HISTORY, hist))
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end
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def gets
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if l = readline(@prompt, true)
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HISTORY.pop if l.empty?
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@line[@line_no += 1] = l + "\n"
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else
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@eof = true
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l
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end
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end
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def eof?
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@eof
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end
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def readable_atfer_eof?
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true
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end
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def line(line_no)
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@line[line_no]
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end
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end
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rescue LoadError
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end
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end
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