Class: Session::Sh

Inherits:
AbstractSession show all
Defined in:
lib/session.rb

Overview

class AbstractSession

Direct Known Subclasses

Bash

Constant Summary collapse

DEFAULT_PROG = 
'sh'
ECHO = 
'echo'

Instance Attribute Summary collapse

Attributes inherited from AbstractSession

#debug, #errproc, #history, #opts, #outproc, #prog, #stderr, #stdin, #stdout, #threads, #track_history, #use_open3, #use_spawn

Instance Method Summary collapse

Methods inherited from AbstractSession

#__fork, #__popen3, #close!, default_prog, default_prog=, #getopt, #hasopt, init, #initialize, #ready?

Constructor Details

This class inherits a constructor from Session::AbstractSession

Instance Attribute Details

#status ⇒ Object (readonly) Also known as: exit_status, exitstatus

Returns the value of attribute status.



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# File 'lib/session.rb', line 449

def status
  @status
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/session.rb', line 453

def clear
  stdin.puts "#{ ECHO } __clear__ 1>&2"
  stdin.puts "#{ ECHO } __clear__"
  stdin.flush
  while((line = stderr.gets) and line !~ %r/__clear__/o); end
  while((line = stdout.gets) and line !~ %r/__clear__/o); end
  self
end

#execute(command, redirects = {}, &block) ⇒ Object 



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# File 'lib/session.rb', line 516

def execute(command, redirects = {}, &block)
# setup redirect on stdin
  rin = redirects[:i] || redirects[:in] || redirects[:stdin] || 
         redirects['stdin'] || redirects['i'] || redirects['in'] ||
         redirects[0] || redirects['0']

  if rin
    tmp = 
      begin
        Tempfile::new rand.to_s
      rescue
        Tempfile::new rand.to_s
      end

    begin
      tmp.write(
        if rin.respond_to? 'read'
          rin.read
        elsif rin.respond_to? 'to_s'
          rin.to_s
        else
          rin
        end
      )
      tmp.flush
      command = "{ #{ command } ;} < #{ tmp.path }"
      #puts command
      super(command, redirects, &block)
    ensure
      tmp.close! if tmp 
    end

  else
    super
  end
end

#get_status ⇒ Object 



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# File 'lib/session.rb', line 473

def get_status
  @status = get_var '__exit_status__' 
  unless @status =~ /^\s*\d+\s*$/o
    raise ExecutionError, "could not determine exit status from <#{ @status.inspect }>"
  end

  @status = Integer @status
end

#get_var(name) ⇒ Object 



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# File 'lib/session.rb', line 485

def get_var name
  stdin.puts "#{ ECHO } \"#{ name }=${#{ name }}\""
  stdin.flush

  var = nil
  while((line = stdout.gets))
    m = %r/#{ name }\s*=\s*(.*)/.match line
    if m
      var = m[1] 
      raise ExecutionError, "could not determine <#{ name }> from <#{ line.inspect }>" unless var
      break
    end
  end

  var
end

#path ⇒ Object 



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# File 'lib/session.rb', line 501

def path 
  var = get_var 'PATH'
  var.strip.split %r/:/o
end

#path=(arg) ⇒ Object 



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# File 'lib/session.rb', line 505

def path= arg 
  case arg
    when Array
      arg = arg.join ':'
    else
      arg = arg.to_s.strip
  end

  set_var 'PATH', "'#{ arg }'"
  self.path
end

#send_command(cmd) ⇒ Object 



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# File 'lib/session.rb', line 461

def send_command cmd
  stdin.printf "%s '%s' 1>&2\n", ECHO, cmd.begin_err
  stdin.printf "%s '%s' \n", ECHO, cmd.begin_out
 
  stdin.printf "%s\n", cmd.cmd
  stdin.printf "export __exit_status__=$?\n"

  stdin.printf "%s '%s' 1>&2\n", ECHO, cmd.end_err
  stdin.printf "%s '%s' \n", ECHO, cmd.end_out
 
  stdin.flush
end

#set_var(name, value) ⇒ Object 



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# File 'lib/session.rb', line 481

def set_var name, value
  stdin.puts "export #{ name }=#{ value }"
  stdin.flush
end