Module: Ctags::Exuberant

Extended by:
Exuberant
Includes:
POSIX::Spawn
Included in:
Exuberant
Defined in:
lib/ctags/exuberant.rb

Constant Summary collapse

BIN = 
File.expand_path("../../../ext/dst/bin/ctags", __FILE__)
CONFIG = 
File.expand_path("../../ctags.cnf", __FILE__)

Instance Method Summary collapse

Instance Method Details

#alive? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ctags/exuberant.rb', line 38

def alive?
  return true if @pid && Process.kill(0, @pid)
  false
rescue Errno::ENOENT, Errno::ESRCH
  false
rescue Errno::EPERM
  raise "EPERM checking if child process is alive."
end

#execute(command, data = nil) ⇒ Object 



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# File 'lib/ctags/exuberant.rb', line 47

def execute(command, data=nil)
  start unless alive?

  json = Yajl.dump(command)
  @in.puts json
  @in.write data if data

  warnings = []
  tags = []

  while line = @out.gets
    obj = Yajl.load(line, :symbolize_keys => true)
    if obj[:error] && obj[:fatal]
      raise obj[:error]
    elsif obj[:error]
      warnings << obj
    elsif obj[:_type] == 'tag'
      obj.delete :_type
      obj[:pattern].strip!
      tags << obj
    elsif obj[:completed]
      break
    else
      raise "unknown obj: #{obj.inspect}"
    end
  end

  if tags.empty? and warnings.any?
    raise Error, warnings[0][:error]
  end

  tags
end

#start ⇒ Object 



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# File 'lib/ctags/exuberant.rb', line 13

def start
  args = [
    '--options=NONE',
    "--options=#{CONFIG}",
    '--fields=+KlnzsStimfa',
    '--sort=no',
    '--json'
  ]

  @pid, @in, @out, @err = popen4(BIN, *args)
  at_exit{ stop }
  @info = Yajl.load(@out.gets, :symbolize_keys => true)
end

#stop ⇒ Object 



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# File 'lib/ctags/exuberant.rb', line 27

def stop
  if @pid
    begin
      Process.kill('KILL', @pid)
      Process.waitpid(@pid)
    rescue Errno::ESRCH, Errno::ECHILD
    end
  end
  @pid = nil
end

#tags_for_file(filename, code = nil) ⇒ Object 



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# File 'lib/ctags/exuberant.rb', line 81

def tags_for_file(filename, code=nil)
  cmd = {'command'=>'generate-tags','filename'=>filename}
  cmd['size'] = code.bytesize if code
  execute(cmd, code)
end