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Mini Shell
Mini Shell
require 'io/console'
require 'timeout'
require 'forwardable'
require 'reline/version'
require 'reline/config'
require 'reline/key_actor'
require 'reline/key_stroke'
require 'reline/line_editor'
require 'reline/history'
require 'rbconfig'
module Reline
FILENAME_COMPLETION_PROC = nil
USERNAME_COMPLETION_PROC = nil
Key = Struct.new('Key', :char, :combined_char, :with_meta)
CursorPos = Struct.new(:x, :y)
class Core
ATTR_READER_NAMES = %i(
completion_append_character
basic_word_break_characters
completer_word_break_characters
basic_quote_characters
completer_quote_characters
filename_quote_characters
special_prefixes
completion_proc
output_modifier_proc
prompt_proc
auto_indent_proc
pre_input_hook
dig_perfect_match_proc
).each(&method(:attr_reader))
attr_accessor :config
attr_accessor :key_stroke
attr_accessor :line_editor
attr_accessor :ambiguous_width
attr_accessor :last_incremental_search
attr_reader :output
def initialize
self.output = STDOUT
yield self
@completion_quote_character = nil
end
def encoding
Reline::IOGate.encoding
end
def completion_append_character=(val)
if val.nil?
@completion_append_character = nil
elsif val.size == 1
@completion_append_character = val.encode(Reline::IOGate.encoding)
elsif val.size > 1
@completion_append_character = val[0].encode(Reline::IOGate.encoding)
else
@completion_append_character = nil
end
end
def basic_word_break_characters=(v)
@basic_word_break_characters = v.encode(Reline::IOGate.encoding)
end
def completer_word_break_characters=(v)
@completer_word_break_characters = v.encode(Reline::IOGate.encoding)
end
def basic_quote_characters=(v)
@basic_quote_characters = v.encode(Reline::IOGate.encoding)
end
def completer_quote_characters=(v)
@completer_quote_characters = v.encode(Reline::IOGate.encoding)
end
def filename_quote_characters=(v)
@filename_quote_characters = v.encode(Reline::IOGate.encoding)
end
def special_prefixes=(v)
@special_prefixes = v.encode(Reline::IOGate.encoding)
end
def completion_case_fold=(v)
@config.completion_ignore_case = v
end
def completion_case_fold
@config.completion_ignore_case
end
def completion_quote_character
@completion_quote_character
end
def completion_proc=(p)
raise ArgumentError unless p.respond_to?(:call) or p.nil?
@completion_proc = p
end
def output_modifier_proc=(p)
raise ArgumentError unless p.respond_to?(:call) or p.nil?
@output_modifier_proc = p
end
def prompt_proc=(p)
raise ArgumentError unless p.respond_to?(:call) or p.nil?
@prompt_proc = p
end
def auto_indent_proc=(p)
raise ArgumentError unless p.respond_to?(:call) or p.nil?
@auto_indent_proc = p
end
def pre_input_hook=(p)
@pre_input_hook = p
end
def dig_perfect_match_proc=(p)
raise ArgumentError unless p.respond_to?(:call) or p.nil?
@dig_perfect_match_proc = p
end
def input=(val)
raise TypeError unless val.respond_to?(:getc) or val.nil?
if val.respond_to?(:getc)
if defined?(Reline::ANSI) and Reline::IOGate == Reline::ANSI
Reline::ANSI.input = val
elsif Reline::IOGate == Reline::GeneralIO
Reline::GeneralIO.input = val
end
end
end
def output=(val)
raise TypeError unless val.respond_to?(:write) or val.nil?
@output = val
if defined?(Reline::ANSI) and Reline::IOGate == Reline::ANSI
Reline::ANSI.output = val
end
end
def vi_editing_mode
config.editing_mode = :vi_insert
nil
end
def emacs_editing_mode
config.editing_mode = :emacs
nil
end
def vi_editing_mode?
config.editing_mode_is?(:vi_insert, :vi_command)
end
def emacs_editing_mode?
config.editing_mode_is?(:emacs)
end
def get_screen_size
Reline::IOGate.get_screen_size
end
def readmultiline(prompt = '', add_hist = false, &confirm_multiline_termination)
unless confirm_multiline_termination
raise ArgumentError.new('#readmultiline needs block to confirm multiline termination')
end
inner_readline(prompt, add_hist, true, &confirm_multiline_termination)
whole_buffer = line_editor.whole_buffer.dup
whole_buffer.taint if RUBY_VERSION < '2.7'
if add_hist and whole_buffer and whole_buffer.chomp("\n").size > 0
Reline::HISTORY << whole_buffer
end
line_editor.reset_line if line_editor.whole_buffer.nil?
whole_buffer
end
def readline(prompt = '', add_hist = false)
inner_readline(prompt, add_hist, false)
line = line_editor.line.dup
line.taint if RUBY_VERSION < '2.7'
if add_hist and line and line.chomp("\n").size > 0
Reline::HISTORY << line.chomp("\n")
end
line_editor.reset_line if line_editor.line.nil?
line
end
private def inner_readline(prompt, add_hist, multiline, &confirm_multiline_termination)
if ENV['RELINE_STDERR_TTY']
$stderr.reopen(ENV['RELINE_STDERR_TTY'], 'w')
$stderr.sync = true
$stderr.puts "Reline is used by #{Process.pid}"
end
otio = Reline::IOGate.prep
may_req_ambiguous_char_width
line_editor.reset(prompt, encoding: Reline::IOGate.encoding)
if multiline
line_editor.multiline_on
if block_given?
line_editor.confirm_multiline_termination_proc = confirm_multiline_termination
end
else
line_editor.multiline_off
end
line_editor.output = output
line_editor.completion_proc = completion_proc
line_editor.completion_append_character = completion_append_character
line_editor.output_modifier_proc = output_modifier_proc
line_editor.prompt_proc = prompt_proc
line_editor.auto_indent_proc = auto_indent_proc
line_editor.dig_perfect_match_proc = dig_perfect_match_proc
line_editor.pre_input_hook = pre_input_hook
unless config.test_mode
config.read
config.reset_default_key_bindings
Reline::IOGate::RAW_KEYSTROKE_CONFIG.each_pair do |key, func|
config.add_default_key_binding(key, func)
end
end
line_editor.rerender
begin
loop do
read_io(config.keyseq_timeout) { |inputs|
inputs.each { |c|
line_editor.input_key(c)
line_editor.rerender
}
}
break if line_editor.finished?
end
Reline::IOGate.move_cursor_column(0)
rescue Errno::EIO
# Maybe the I/O has been closed.
rescue StandardError => e
line_editor.finalize
Reline::IOGate.deprep(otio)
raise e
end
line_editor.finalize
Reline::IOGate.deprep(otio)
end
# Keystrokes of GNU Readline will timeout it with the specification of
# "keyseq-timeout" when waiting for the 2nd character after the 1st one.
# If the 2nd character comes after 1st ESC without timeout it has a
# meta-property of meta-key to discriminate modified key with meta-key
# from multibyte characters that come with 8th bit on.
#
# GNU Readline will wait for the 2nd character with "keyseq-timeout"
# milli-seconds but wait forever after 3rd characters.
private def read_io(keyseq_timeout, &block)
buffer = []
loop do
c = Reline::IOGate.getc
buffer << c
result = key_stroke.match_status(buffer)
case result
when :matched
expanded = key_stroke.expand(buffer).map{ |expanded_c|
Reline::Key.new(expanded_c, expanded_c, false)
}
block.(expanded)
break
when :matching
if buffer.size == 1
begin
succ_c = nil
Timeout.timeout(keyseq_timeout / 1000.0) {
succ_c = Reline::IOGate.getc
}
rescue Timeout::Error # cancel matching only when first byte
block.([Reline::Key.new(c, c, false)])
break
else
if key_stroke.match_status(buffer.dup.push(succ_c)) == :unmatched
if c == "\e".ord
block.([Reline::Key.new(succ_c, succ_c | 0b10000000, true)])
else
block.([Reline::Key.new(c, c, false), Reline::Key.new(succ_c, succ_c, false)])
end
break
else
Reline::IOGate.ungetc(succ_c)
end
end
end
when :unmatched
if buffer.size == 1 and c == "\e".ord
read_escaped_key(keyseq_timeout, c, block)
else
expanded = buffer.map{ |expanded_c|
Reline::Key.new(expanded_c, expanded_c, false)
}
block.(expanded)
end
break
end
end
end
private def read_escaped_key(keyseq_timeout, c, block)
begin
escaped_c = nil
Timeout.timeout(keyseq_timeout / 1000.0) {
escaped_c = Reline::IOGate.getc
}
rescue Timeout::Error # independent ESC
block.([Reline::Key.new(c, c, false)])
else
if escaped_c.nil?
block.([Reline::Key.new(c, c, false)])
elsif escaped_c >= 128 # maybe, first byte of multi byte
block.([Reline::Key.new(c, c, false), Reline::Key.new(escaped_c, escaped_c, false)])
elsif escaped_c == "\e".ord # escape twice
block.([Reline::Key.new(c, c, false), Reline::Key.new(c, c, false)])
else
block.([Reline::Key.new(escaped_c, escaped_c | 0b10000000, true)])
end
end
end
private def may_req_ambiguous_char_width
@ambiguous_width = 2 if Reline::IOGate == Reline::GeneralIO or STDOUT.is_a?(File)
return if ambiguous_width
Reline::IOGate.move_cursor_column(0)
begin
output.write "\u{25bd}"
rescue Encoding::UndefinedConversionError
# LANG=C
@ambiguous_width = 1
else
@ambiguous_width = Reline::IOGate.cursor_pos.x
end
Reline::IOGate.move_cursor_column(0)
Reline::IOGate.erase_after_cursor
end
end
extend Forwardable
extend SingleForwardable
#--------------------------------------------------------
# Documented API
#--------------------------------------------------------
(Core::ATTR_READER_NAMES).each { |name|
def_single_delegators :core, "#{name}", "#{name}="
}
def_single_delegators :core, :input=, :output=
def_single_delegators :core, :vi_editing_mode, :emacs_editing_mode
def_single_delegators :core, :readline
def_single_delegators :core, :completion_case_fold, :completion_case_fold=
def_single_delegators :core, :completion_quote_character
def_instance_delegators self, :readline
private :readline
#--------------------------------------------------------
# Undocumented API
#--------------------------------------------------------
# Testable in original
def_single_delegators :core, :get_screen_size
def_single_delegators :line_editor, :eof?
def_instance_delegators self, :eof?
def_single_delegators :line_editor, :delete_text
def_single_delegator :line_editor, :line, :line_buffer
def_single_delegator :line_editor, :byte_pointer, :point
def_single_delegator :line_editor, :byte_pointer=, :point=
def self.insert_text(*args, &block)
line_editor.insert_text(*args, &block)
self
end
# Untestable in original
def_single_delegator :line_editor, :rerender, :redisplay
def_single_delegators :core, :vi_editing_mode?, :emacs_editing_mode?
def_single_delegators :core, :ambiguous_width
def_single_delegators :core, :last_incremental_search
def_single_delegators :core, :last_incremental_search=
def_single_delegators :core, :readmultiline
def_instance_delegators self, :readmultiline
private :readmultiline
def self.encoding_system_needs
self.core.encoding
end
def self.core
@core ||= Core.new { |core|
core.config = Reline::Config.new
core.key_stroke = Reline::KeyStroke.new(core.config)
core.line_editor = Reline::LineEditor.new(core.config, Reline::IOGate.encoding)
core.basic_word_break_characters = " \t\n`><=;|&{("
core.completer_word_break_characters = " \t\n`><=;|&{("
core.basic_quote_characters = '"\''
core.completer_quote_characters = '"\''
core.filename_quote_characters = ""
core.special_prefixes = ""
}
end
def self.line_editor
core.line_editor
end
end
if RbConfig::CONFIG['host_os'] =~ /mswin|msys|mingw|cygwin|bccwin|wince|emc/
require 'reline/windows'
if Reline::Windows.msys_tty?
require 'reline/ansi'
Reline::IOGate = Reline::ANSI
else
Reline::IOGate = Reline::Windows
end
else
require 'reline/ansi'
Reline::IOGate = Reline::ANSI
end
Reline::HISTORY = Reline::History.new(Reline.core.config)
require 'reline/general_io'
Zerion Mini Shell 1.0