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# frozen_string_literal: false
#
# shell.rb -
# $Release Version: 0.7 $
# $Revision: 1.9 $
# by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
require "e2mmap"
require "forwardable"
require "shell/error"
require "shell/command-processor"
require "shell/process-controller"
# Shell implements an idiomatic Ruby interface for common UNIX shell commands.
#
# It provides users the ability to execute commands with filters and pipes,
# like +sh+/+csh+ by using native facilities of Ruby.
#
# == Examples
#
# === Temp file creation
#
# In this example we will create three +tmpFile+'s in three different folders
# under the +/tmp+ directory.
#
# sh = Shell.cd("/tmp") # Change to the /tmp directory
# sh.mkdir "shell-test-1" unless sh.exists?("shell-test-1")
# # make the 'shell-test-1' directory if it doesn't already exist
# sh.cd("shell-test-1") # Change to the /tmp/shell-test-1 directory
# for dir in ["dir1", "dir3", "dir5"]
# if !sh.exists?(dir)
# sh.mkdir dir # make dir if it doesn't already exist
# sh.cd(dir) do
# # change to the `dir` directory
# f = sh.open("tmpFile", "w") # open a new file in write mode
# f.print "TEST\n" # write to the file
# f.close # close the file handler
# end
# print sh.pwd # output the process working directory
# end
# end
#
# === Temp file creation with self
#
# This example is identical to the first, except we're using
# CommandProcessor#transact.
#
# CommandProcessor#transact executes the given block against self, in this case
# +sh+; our Shell object. Within the block we can substitute +sh.cd+ to +cd+,
# because the scope within the block uses +sh+ already.
#
# sh = Shell.cd("/tmp")
# sh.transact do
# mkdir "shell-test-1" unless exists?("shell-test-1")
# cd("shell-test-1")
# for dir in ["dir1", "dir3", "dir5"]
# if !exists?(dir)
# mkdir dir
# cd(dir) do
# f = open("tmpFile", "w")
# f.print "TEST\n"
# f.close
# end
# print pwd
# end
# end
# end
#
# === Pipe /etc/printcap into a file
#
# In this example we will read the operating system file +/etc/printcap+,
# generated by +cupsd+, and then output it to a new file relative to the +pwd+
# of +sh+.
#
# sh = Shell.new
# sh.cat("/etc/printcap") | sh.tee("tee1") > "tee2"
# (sh.cat < "/etc/printcap") | sh.tee("tee11") > "tee12"
# sh.cat("/etc/printcap") | sh.tee("tee1") >> "tee2"
# (sh.cat < "/etc/printcap") | sh.tee("tee11") >> "tee12"
#
class Shell
include Error
extend Exception2MessageMapper
# debug: true -> normal debug
# debug: 1 -> eval definition debug
# debug: 2 -> detail inspect debug
@debug = false
@verbose = true
@debug_display_process_id = false
@debug_display_thread_id = true
@debug_output_mutex = Thread::Mutex.new
@default_system_path = nil
@default_record_separator = nil
class << Shell
extend Forwardable
attr_accessor :cascade, :verbose
attr_reader :debug
alias debug? debug
alias verbose? verbose
@verbose = true
def debug=(val)
@debug = val
@verbose = val if val
end
# call-seq:
# Shell.cd(path)
#
# Creates a new Shell instance with the current working directory
# set to +path+.
def cd(path)
new(path)
end
# Returns the directories in the current shell's PATH environment variable
# as an array of directory names. This sets the system_path for all
# instances of Shell.
#
# Example: If in your current shell, you did:
#
# $ echo $PATH
# /usr/bin:/bin:/usr/local/bin
#
# Running this method in the above shell would then return:
#
# ["/usr/bin", "/bin", "/usr/local/bin"]
#
def default_system_path
if @default_system_path
@default_system_path
else
ENV["PATH"].split(":")
end
end
# Sets the system_path that new instances of Shell should have as their
# initial system_path.
#
# +path+ should be an array of directory name strings.
def default_system_path=(path)
@default_system_path = path
end
def default_record_separator
if @default_record_separator
@default_record_separator
else
$/
end
end
def default_record_separator=(rs)
@default_record_separator = rs
end
# os resource mutex
mutex_methods = ["unlock", "lock", "locked?", "synchronize", "try_lock"]
for m in mutex_methods
def_delegator("@debug_output_mutex", m, "debug_output_"+m.to_s)
end
end
# call-seq:
# Shell.new(pwd, umask) -> obj
#
# Creates a Shell object which current directory is set to the process
# current directory, unless otherwise specified by the +pwd+ argument.
def initialize(pwd = Dir.pwd, umask = nil)
@cwd = File.expand_path(pwd)
@dir_stack = []
@umask = umask
@system_path = Shell.default_system_path
@record_separator = Shell.default_record_separator
@command_processor = CommandProcessor.new(self)
@process_controller = ProcessController.new(self)
@verbose = Shell.verbose
@debug = Shell.debug
end
# Returns the command search path in an array
attr_reader :system_path
# Sets the system path (the Shell instance's PATH environment variable).
#
# +path+ should be an array of directory name strings.
def system_path=(path)
@system_path = path
rehash
end
# Returns the umask
attr_accessor :umask
attr_accessor :record_separator
attr_accessor :verbose
attr_reader :debug
def debug=(val)
@debug = val
@verbose = val if val
end
alias verbose? verbose
alias debug? debug
attr_reader :command_processor
attr_reader :process_controller
def expand_path(path)
File.expand_path(path, @cwd)
end
# Most Shell commands are defined via CommandProcessor
#
# Dir related methods
#
# Shell#cwd/dir/getwd/pwd
# Shell#chdir/cd
# Shell#pushdir/pushd
# Shell#popdir/popd
# Shell#mkdir
# Shell#rmdir
# Returns the current working directory.
attr_reader :cwd
alias dir cwd
alias getwd cwd
alias pwd cwd
attr_reader :dir_stack
alias dirs dir_stack
# call-seq:
# Shell.chdir(path)
#
# Creates a Shell object which current directory is set to +path+.
#
# If a block is given, it restores the current directory when the block ends.
#
# If called as iterator, it restores the current directory when the
# block ends.
def chdir(path = nil, verbose = @verbose)
check_point
if iterator?
notify("chdir(with block) #{path}") if verbose
cwd_old = @cwd
begin
chdir(path, nil)
yield
ensure
chdir(cwd_old, nil)
end
else
notify("chdir #{path}") if verbose
path = "~" unless path
@cwd = expand_path(path)
notify "current dir: #{@cwd}"
rehash
Void.new(self)
end
end
alias cd chdir
# call-seq:
# pushdir(path)
# pushdir(path) { &block }
#
# Pushes the current directory to the directory stack, changing the current
# directory to +path+.
#
# If +path+ is omitted, it exchanges its current directory and the top of its
# directory stack.
#
# If a block is given, it restores the current directory when the block ends.
def pushdir(path = nil, verbose = @verbose)
check_point
if iterator?
notify("pushdir(with block) #{path}") if verbose
pushdir(path, nil)
begin
yield
ensure
popdir
end
elsif path
notify("pushdir #{path}") if verbose
@dir_stack.push @cwd
chdir(path, nil)
notify "dir stack: [#{@dir_stack.join ', '}]"
self
else
notify("pushdir") if verbose
if pop = @dir_stack.pop
@dir_stack.push @cwd
chdir pop
notify "dir stack: [#{@dir_stack.join ', '}]"
self
else
Shell.Fail DirStackEmpty
end
end
Void.new(self)
end
alias pushd pushdir
# Pops a directory from the directory stack, and sets the current directory
# to it.
def popdir
check_point
notify("popdir")
if pop = @dir_stack.pop
chdir pop
notify "dir stack: [#{@dir_stack.join ', '}]"
self
else
Shell.Fail DirStackEmpty
end
Void.new(self)
end
alias popd popdir
# Returns a list of scheduled jobs.
def jobs
@process_controller.jobs
end
# call-seq:
# kill(signal, job)
#
# Sends the given +signal+ to the given +job+
def kill(sig, command)
@process_controller.kill_job(sig, command)
end
# call-seq:
# def_system_command(command, path = command)
#
# Convenience method for Shell::CommandProcessor.def_system_command.
# Defines an instance method which will execute the given shell command.
# If the executable is not in Shell.default_system_path, you must
# supply the path to it.
#
# Shell.def_system_command('hostname')
# Shell.new.hostname # => localhost
#
# # How to use an executable that's not in the default path
#
# Shell.def_system_command('run_my_program', "~/hello")
# Shell.new.run_my_program # prints "Hello from a C program!"
#
def Shell.def_system_command(command, path = command)
CommandProcessor.def_system_command(command, path)
end
# Convenience method for Shell::CommandProcessor.undef_system_command
def Shell.undef_system_command(command)
CommandProcessor.undef_system_command(command)
end
# call-seq:
# alias_command(alias, command, *opts, &block)
#
# Convenience method for Shell::CommandProcessor.alias_command.
# Defines an instance method which will execute a command under
# an alternative name.
#
# Shell.def_system_command('date')
# Shell.alias_command('date_in_utc', 'date', '-u')
# Shell.new.date_in_utc # => Sat Jan 25 16:59:57 UTC 2014
#
def Shell.alias_command(ali, command, *opts, &block)
CommandProcessor.alias_command(ali, command, *opts, &block)
end
# Convenience method for Shell::CommandProcessor.unalias_command
def Shell.unalias_command(ali)
CommandProcessor.unalias_command(ali)
end
# call-seq:
# install_system_commands(pre = "sys_")
#
# Convenience method for Shell::CommandProcessor.install_system_commands.
# Defines instance methods representing all the executable files found in
# Shell.default_system_path, with the given prefix prepended to their
# names.
#
# Shell.install_system_commands
# Shell.new.sys_echo("hello") # => hello
#
def Shell.install_system_commands(pre = "sys_")
CommandProcessor.install_system_commands(pre)
end
#
def inspect
if debug.kind_of?(Integer) && debug > 2
super
else
to_s
end
end
def self.notify(*opts)
Shell::debug_output_synchronize do
if opts[-1].kind_of?(String)
yorn = verbose?
else
yorn = opts.pop
end
return unless yorn
if @debug_display_thread_id
if @debug_display_process_id
prefix = "shell(##{Process.pid}:#{Thread.current.to_s.sub("Thread", "Th")}): "
else
prefix = "shell(#{Thread.current.to_s.sub("Thread", "Th")}): "
end
else
prefix = "shell: "
end
_head = true
STDERR.print opts.collect{|mes|
mes = mes.dup
yield mes if iterator?
if _head
_head = false
prefix + mes
else
" "* prefix.size + mes
end
}.join("\n")+"\n"
end
end
CommandProcessor.initialize
CommandProcessor.run_config
end
Mini Shell