Module: Shella::Shell

Defined in:
lib/shella/shell.rb

Class Method Summary collapse

Class Method Details

.call(file) ⇒ Object

execute another scrit from this



14
15
16
17
18
19
20
21
 
# File 'lib/shella/shell.rb', line 14

def self.call(file)
  File.open(file) do |f|
    f.each_line do |line|
      command, args = line.split(" ", 2)
      self.send(command, args)
    end
  end
end

.method_missing(method, *args, &block) ⇒ Object

the core functionality : any command send to the module is redirected to the shell



69
70
71
72
73
74
75
76
77
78
79
 
# File 'lib/shella/shell.rb', line 69

def self.method_missing(method, *args, &block)
  command = "#{method.to_s.gsub(/_/, ' ')} #{args[0]}"
  begin
    popen(command) do |stdin, stdout, stderr|
      puts stdout.read if not stdout.eof?
      puts stderr.read if not stderr.eof?
    end
  rescue Errno::ENOENT
    puts "unknown command : #{command}"
  end
end

.popen(cmd) ⇒ Object

execute a shell command and get the sdin, stdout and stderr output



35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
 
# File 'lib/shella/shell.rb', line 35

def self.popen(cmd)
  @env ||= ENV
  
  pw = IO::pipe   # pipe[0] for read, pipe[1] for write

  pr = IO::pipe
  pe = IO::pipe
  
  pid = spawn(
    @env,
    cmd,
    STDIN=>pw[0],
    STDOUT=>pr[1],
    STDERR=>pe[1],
    :unsetenv_others => true
  )
  
  wait_thr = Process.detach(pid)
  pw[0].close
  pr[1].close
  pe[1].close
  pi = [pw[1], pr[0], pe[0], wait_thr]
  pw[1].sync = true
  if defined? yield
    begin
      return yield(*pi)
    ensure
      [pw[1], pr[0], pe[0]].each{|p| p.close unless p.closed?}
      wait_thr.join
    end
  end
  pi
end

.rmdir(filename) ⇒ Object

delete a directory and its contents



24
25
26
27
28
29
30
31
32
 
# File 'lib/shella/shell.rb', line 24

def self.rmdir(filename)
  if File.exists? filename
    if File.directory? filename
      FileUtils.rm_r filename
    else
      FileUtils.rm filename
    end
  end
end

.set(env_var) ⇒ Object

set an environment variable



6
7
8
9
10
11
 
# File 'lib/shella/shell.rb', line 6

def self.set(env_var)
  var, value = env_var.split('=', 2)
  @env ||= {}
  @env.merge! ENV
  @env[var] = value
end