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Mini Shell
#
# shell/command-controller.rb -
# $Release Version: 0.7 $
# $Revision: 42961 $
# by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
require "e2mmap"
require "thread"
require "shell/error"
require "shell/filter"
require "shell/system-command"
require "shell/builtin-command"
class Shell
# In order to execute a command on your OS, you need to define it as a
# Shell method.
#
# Alternatively, you can execute any command via
# Shell::CommandProcessor#system even if it is not defined.
class CommandProcessor
# include Error
#
# initialize of Shell and related classes.
#
m = [:initialize, :expand_path]
if Object.methods.first.kind_of?(String)
NoDelegateMethods = m.collect{|x| x.id2name}
else
NoDelegateMethods = m
end
def self.initialize
install_builtin_commands
# define CommandProcessor#methods to Shell#methods and Filter#methods
for m in CommandProcessor.instance_methods(false) - NoDelegateMethods
add_delegate_command_to_shell(m)
end
def self.method_added(id)
add_delegate_command_to_shell(id)
end
end
#
# include run file.
#
def self.run_config
begin
load File.expand_path("~/.rb_shell") if ENV.key?("HOME")
rescue LoadError, Errno::ENOENT
rescue
print "load error: #{rc}\n"
print $!.class, ": ", $!, "\n"
for err in $@[0, $@.size - 2]
print "\t", err, "\n"
end
end
end
def initialize(shell)
@shell = shell
@system_commands = {}
end
#
# CommandProcessor#expand_path(path)
# path: String
# return: String
# returns the absolute path for <path>
#
def expand_path(path)
@shell.expand_path(path)
end
# call-seq:
# foreach(path, record_separator) -> Enumerator
# foreach(path, record_separator) { block }
#
# See IO.foreach when +path+ is a file.
#
# See Dir.foreach when +path+ is a directory.
#
def foreach(path = nil, *rs)
path = "." unless path
path = expand_path(path)
if File.directory?(path)
Dir.foreach(path){|fn| yield fn}
else
IO.foreach(path, *rs){|l| yield l}
end
end
# call-seq:
# open(path, mode, permissions) -> Enumerator
# open(path, mode, permissions) { block }
#
# See IO.open when +path+ is a file.
#
# See Dir.open when +path+ is a directory.
#
def open(path, mode = nil, perm = 0666, &b)
path = expand_path(path)
if File.directory?(path)
Dir.open(path, &b)
else
if @shell.umask
f = File.open(path, mode, perm)
File.chmod(perm & ~@shell.umask, path)
if block_given?
f.each(&b)
end
f
else
f = File.open(path, mode, perm, &b)
end
end
end
# public :open
# call-seq:
# unlink(path)
#
# See IO.unlink when +path+ is a file.
#
# See Dir.unlink when +path+ is a directory.
#
def unlink(path)
@shell.check_point
path = expand_path(path)
if File.directory?(path)
Dir.unlink(path)
else
IO.unlink(path)
end
Void.new(@shell)
end
# See Shell::CommandProcessor#test
alias top_level_test test
# call-seq:
# test(command, file1, file2) -> true or false
# [command, file1, file2] -> true or false
#
# Tests if the given +command+ exists in +file1+, or optionally +file2+.
#
# Example:
# sh[?e, "foo"]
# sh[:e, "foo"]
# sh["e", "foo"]
# sh[:exists?, "foo"]
# sh["exists?", "foo"]
#
def test(command, file1, file2=nil)
file1 = expand_path(file1)
file2 = expand_path(file2) if file2
command = command.id2name if command.kind_of?(Symbol)
case command
when Integer
if file2
top_level_test(command, file1, file2)
else
top_level_test(command, file1)
end
when String
if command.size == 1
if file2
top_level_test(command, file1, file2)
else
top_level_test(command, file1)
end
else
if file2
FileTest.send(command, file1, file2)
else
FileTest.send(command, file1)
end
end
end
end
# See Shell::CommandProcessor#test
alias [] test
# call-seq:
# mkdir(path)
#
# Same as Dir.mkdir, except multiple directories are allowed.
def mkdir(*path)
@shell.check_point
notify("mkdir #{path.join(' ')}")
perm = nil
if path.last.kind_of?(Integer)
perm = path.pop
end
for dir in path
d = expand_path(dir)
if perm
Dir.mkdir(d, perm)
else
Dir.mkdir(d)
end
File.chmod(d, 0666 & ~@shell.umask) if @shell.umask
end
Void.new(@shell)
end
# call-seq:
# rmdir(path)
#
# Same as Dir.rmdir, except multiple directories are allowed.
def rmdir(*path)
@shell.check_point
notify("rmdir #{path.join(' ')}")
for dir in path
Dir.rmdir(expand_path(dir))
end
Void.new(@shell)
end
# call-seq:
# system(command, *options) -> SystemCommand
#
# Executes the given +command+ with the +options+ parameter.
#
# Example:
# print sh.system("ls", "-l")
# sh.system("ls", "-l") | sh.head > STDOUT
#
def system(command, *opts)
if opts.empty?
if command =~ /\*|\?|\{|\}|\[|\]|<|>|\(|\)|~|&|\||\\|\$|;|'|`|"|\n/
return SystemCommand.new(@shell, find_system_command("sh"), "-c", command)
else
command, *opts = command.split(/\s+/)
end
end
SystemCommand.new(@shell, find_system_command(command), *opts)
end
# call-seq:
# rehash
#
# Clears the command hash table.
def rehash
@system_commands = {}
end
def check_point # :nodoc:
@shell.process_controller.wait_all_jobs_execution
end
alias finish_all_jobs check_point # :nodoc:
# call-seq:
# transact { block }
#
# Executes a block as self
#
# Example:
# sh.transact { system("ls", "-l") | head > STDOUT }
def transact(&block)
begin
@shell.instance_eval(&block)
ensure
check_point
end
end
# call-seq:
# out(device) { block }
#
# Calls <code>device.print</code> on the result passing the _block_ to
# #transact
def out(dev = STDOUT, &block)
dev.print transact(&block)
end
# call-seq:
# echo(*strings) -> Echo
#
# Returns a Echo object, for the given +strings+
def echo(*strings)
Echo.new(@shell, *strings)
end
# call-seq:
# cat(*filename) -> Cat
#
# Returns a Cat object, for the given +filenames+
def cat(*filenames)
Cat.new(@shell, *filenames)
end
# def sort(*filenames)
# Sort.new(self, *filenames)
# end
# call-seq:
# glob(pattern) -> Glob
#
# Returns a Glob filter object, with the given +pattern+ object
def glob(pattern)
Glob.new(@shell, pattern)
end
def append(to, filter)
case to
when String
AppendFile.new(@shell, to, filter)
when IO
AppendIO.new(@shell, to, filter)
else
Shell.Fail Error::CantApplyMethod, "append", to.class
end
end
# call-seq:
# tee(file) -> Tee
#
# Returns a Tee filter object, with the given +file+ command
def tee(file)
Tee.new(@shell, file)
end
# call-seq:
# concat(*jobs) -> Concat
#
# Returns a Concat object, for the given +jobs+
def concat(*jobs)
Concat.new(@shell, *jobs)
end
# %pwd, %cwd -> @pwd
def notify(*opts)
Shell.notify(*opts) {|mes|
yield mes if iterator?
mes.gsub!("%pwd", "#{@cwd}")
mes.gsub!("%cwd", "#{@cwd}")
}
end
#
# private functions
#
def find_system_command(command)
return command if /^\// =~ command
case path = @system_commands[command]
when String
if exists?(path)
return path
else
Shell.Fail Error::CommandNotFound, command
end
when false
Shell.Fail Error::CommandNotFound, command
end
for p in @shell.system_path
path = join(p, command)
begin
st = File.stat(path)
rescue SystemCallError
next
else
next unless st.executable? and !st.directory?
@system_commands[command] = path
return path
end
end
@system_commands[command] = false
Shell.Fail Error::CommandNotFound, command
end
# call-seq:
# def_system_command(command, path) -> Shell::SystemCommand
#
# Defines a command, registering +path+ as a Shell method for the given
# +command+.
#
# Shell::CommandProcessor.def_system_command "ls"
# #=> Defines ls.
#
# Shell::CommandProcessor.def_system_command "sys_sort", "sort"
# #=> Defines sys_sort as sort
#
def self.def_system_command(command, path = command)
begin
eval((d = %Q[def #{command}(*opts)
SystemCommand.new(@shell, '#{path}', *opts)
end]), nil, __FILE__, __LINE__ - 1)
rescue SyntaxError
Shell.notify "warn: Can't define #{command} path: #{path}."
end
Shell.notify "Define #{command} path: #{path}.", Shell.debug?
Shell.notify("Definition of #{command}: ", d,
Shell.debug.kind_of?(Integer) && Shell.debug > 1)
end
# call-seq:
# undef_system_command(command) -> self
#
# Undefines a command
def self.undef_system_command(command)
command = command.id2name if command.kind_of?(Symbol)
remove_method(command)
Shell.module_eval{remove_method(command)}
Filter.module_eval{remove_method(command)}
self
end
@alias_map = {}
# Returns a list of aliased commands
def self.alias_map
@alias_map
end
# call-seq:
# alias_command(alias, command, *options) -> self
#
# Creates a command alias at the given +alias+ for the given +command+,
# passing any +options+ along with it.
#
# Shell::CommandProcessor.alias_command "lsC", "ls", "-CBF", "--show-control-chars"
# Shell::CommandProcessor.alias_command("lsC", "ls"){|*opts| ["-CBF", "--show-control-chars", *opts]}
#
def self.alias_command(ali, command, *opts)
ali = ali.id2name if ali.kind_of?(Symbol)
command = command.id2name if command.kind_of?(Symbol)
begin
if iterator?
@alias_map[ali.intern] = proc
eval((d = %Q[def #{ali}(*opts)
@shell.__send__(:#{command},
*(CommandProcessor.alias_map[:#{ali}].call *opts))
end]), nil, __FILE__, __LINE__ - 1)
else
args = opts.collect{|opt| '"' + opt + '"'}.join(",")
eval((d = %Q[def #{ali}(*opts)
@shell.__send__(:#{command}, #{args}, *opts)
end]), nil, __FILE__, __LINE__ - 1)
end
rescue SyntaxError
Shell.notify "warn: Can't alias #{ali} command: #{command}."
Shell.notify("Definition of #{ali}: ", d)
raise
end
Shell.notify "Define #{ali} command: #{command}.", Shell.debug?
Shell.notify("Definition of #{ali}: ", d,
Shell.debug.kind_of?(Integer) && Shell.debug > 1)
self
end
# call-seq:
# unalias_command(alias) -> self
#
# Unaliases the given +alias+ command.
def self.unalias_command(ali)
ali = ali.id2name if ali.kind_of?(Symbol)
@alias_map.delete ali.intern
undef_system_command(ali)
end
# :nodoc:
#
# Delegates File and FileTest methods into Shell, including the following
# commands:
#
# * Shell#blockdev?(file)
# * Shell#chardev?(file)
# * Shell#directory?(file)
# * Shell#executable?(file)
# * Shell#executable_real?(file)
# * Shell#exist?(file)/Shell#exists?(file)
# * Shell#file?(file)
# * Shell#grpowned?(file)
# * Shell#owned?(file)
# * Shell#pipe?(file)
# * Shell#readable?(file)
# * Shell#readable_real?(file)
# * Shell#setgid?(file)
# * Shell#setuid?(file)
# * Shell#size(file)/Shell#size?(file)
# * Shell#socket?(file)
# * Shell#sticky?(file)
# * Shell#symlink?(file)
# * Shell#writable?(file)
# * Shell#writable_real?(file)
# * Shell#zero?(file)
# * Shell#syscopy(filename_from, filename_to)
# * Shell#copy(filename_from, filename_to)
# * Shell#move(filename_from, filename_to)
# * Shell#compare(filename_from, filename_to)
# * Shell#safe_unlink(*filenames)
# * Shell#makedirs(*filenames)
# * Shell#install(filename_from, filename_to, mode)
#
# And also, there are some aliases for convenience:
#
# * Shell#cmp <- Shell#compare
# * Shell#mv <- Shell#move
# * Shell#cp <- Shell#copy
# * Shell#rm_f <- Shell#safe_unlink
# * Shell#mkpath <- Shell#makedirs
#
def self.def_builtin_commands(delegation_class, command_specs)
for meth, args in command_specs
arg_str = args.collect{|arg| arg.downcase}.join(", ")
call_arg_str = args.collect{
|arg|
case arg
when /^(FILENAME.*)$/
format("expand_path(%s)", $1.downcase)
when /^(\*FILENAME.*)$/
# \*FILENAME* -> filenames.collect{|fn| expand_path(fn)}.join(", ")
$1.downcase + '.collect{|fn| expand_path(fn)}'
else
arg
end
}.join(", ")
d = %Q[def #{meth}(#{arg_str})
#{delegation_class}.#{meth}(#{call_arg_str})
end]
Shell.notify "Define #{meth}(#{arg_str})", Shell.debug?
Shell.notify("Definition of #{meth}: ", d,
Shell.debug.kind_of?(Integer) && Shell.debug > 1)
eval d
end
end
# call-seq:
# install_system_commands(prefix = "sys_")
#
# Defines all commands in the Shell.default_system_path as Shell method,
# all with given +prefix+ appended to their names.
#
# Any invalid character names are converted to +_+, and errors are passed
# to Shell.notify.
#
# Methods already defined are skipped.
def self.install_system_commands(pre = "sys_")
defined_meth = {}
for m in Shell.methods
defined_meth[m] = true
end
sh = Shell.new
for path in Shell.default_system_path
next unless sh.directory? path
sh.cd path
sh.foreach do
|cn|
if !defined_meth[pre + cn] && sh.file?(cn) && sh.executable?(cn)
command = (pre + cn).gsub(/\W/, "_").sub(/^([0-9])/, '_\1')
begin
def_system_command(command, sh.expand_path(cn))
rescue
Shell.notify "warn: Can't define #{command} path: #{cn}"
end
defined_meth[command] = command
end
end
end
end
def self.add_delegate_command_to_shell(id) # :nodoc:
id = id.intern if id.kind_of?(String)
name = id.id2name
if Shell.method_defined?(id)
Shell.notify "warn: override definition of Shell##{name}."
Shell.notify "warn: alias Shell##{name} to Shell##{name}_org.\n"
Shell.module_eval "alias #{name}_org #{name}"
end
Shell.notify "method added: Shell##{name}.", Shell.debug?
Shell.module_eval(%Q[def #{name}(*args, &block)
begin
@command_processor.__send__(:#{name}, *args, &block)
rescue Exception
$@.delete_if{|s| /:in `__getobj__'$/ =~ s} #`
$@.delete_if{|s| /^\\(eval\\):/ =~ s}
raise
end
end], __FILE__, __LINE__)
if Shell::Filter.method_defined?(id)
Shell.notify "warn: override definition of Shell::Filter##{name}."
Shell.notify "warn: alias Shell##{name} to Shell::Filter##{name}_org."
Filter.module_eval "alias #{name}_org #{name}"
end
Shell.notify "method added: Shell::Filter##{name}.", Shell.debug?
Filter.module_eval(%Q[def #{name}(*args, &block)
begin
self | @shell.__send__(:#{name}, *args, &block)
rescue Exception
$@.delete_if{|s| /:in `__getobj__'$/ =~ s} #`
$@.delete_if{|s| /^\\(eval\\):/ =~ s}
raise
end
end], __FILE__, __LINE__)
end
# Delegates File methods into Shell, including the following commands:
#
# * Shell#atime(file)
# * Shell#basename(file, *opt)
# * Shell#chmod(mode, *files)
# * Shell#chown(owner, group, *file)
# * Shell#ctime(file)
# * Shell#delete(*file)
# * Shell#dirname(file)
# * Shell#ftype(file)
# * Shell#join(*file)
# * Shell#link(file_from, file_to)
# * Shell#lstat(file)
# * Shell#mtime(file)
# * Shell#readlink(file)
# * Shell#rename(file_from, file_to)
# * Shell#split(file)
# * Shell#stat(file)
# * Shell#symlink(file_from, file_to)
# * Shell#truncate(file, length)
# * Shell#utime(atime, mtime, *file)
#
def self.install_builtin_commands
# method related File.
# (exclude open/foreach/unlink)
normal_delegation_file_methods = [
["atime", ["FILENAME"]],
["basename", ["fn", "*opts"]],
["chmod", ["mode", "*FILENAMES"]],
["chown", ["owner", "group", "*FILENAME"]],
["ctime", ["FILENAMES"]],
["delete", ["*FILENAMES"]],
["dirname", ["FILENAME"]],
["ftype", ["FILENAME"]],
["join", ["*items"]],
["link", ["FILENAME_O", "FILENAME_N"]],
["lstat", ["FILENAME"]],
["mtime", ["FILENAME"]],
["readlink", ["FILENAME"]],
["rename", ["FILENAME_FROM", "FILENAME_TO"]],
# ["size", ["FILENAME"]],
["split", ["pathname"]],
["stat", ["FILENAME"]],
["symlink", ["FILENAME_O", "FILENAME_N"]],
["truncate", ["FILENAME", "length"]],
["utime", ["atime", "mtime", "*FILENAMES"]]]
def_builtin_commands(File, normal_delegation_file_methods)
alias_method :rm, :delete
# method related FileTest
def_builtin_commands(FileTest,
FileTest.singleton_methods(false).collect{|m| [m, ["FILENAME"]]})
end
end
end
Zerion Mini Shell 1.0