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