Class: RustWatcher

Inherits:
Object
  • Object
show all
Defined in:
lib/rust_watcher.rb,
lib/rust_watcher/version.rb

Constant Summary collapse

VERSION = 
"0.1.0"

Instance Method Summary collapse

Constructor Details

#initialize(path, &block) ⇒ RustWatcher

Returns a new instance of RustWatcher.



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# File 'lib/rust_watcher.rb', line 5

def initialize(path, &block)
  @path = path
  @block = block
  raise 'Block must take exactly two arguments' unless @block.arity == 2
end

Instance Method Details

#path ⇒ Object 



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# File 'lib/rust_watcher.rb', line 11

def path
  @path
end

#start_watcher ⇒ Object 



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# File 'lib/rust_watcher.rb', line 15

def start_watcher
  return if watcher_running?

  child_read, parent_write = IO.pipe
  parent_read, child_write = IO.pipe

  @watcher_pid = fork do
    begin
      parent_read.close
      parent_write.close

      watch_binding(child_read, child_write)
    ensure
      child_read.close
      child_write.close
    end
  end

  child_read.close
  child_write.close

  @runner_pid = fork do
    begin
      loop do
        break unless watcher_running?
        read_pipe = IO.select([parent_read]).first.first

        if read_pipe
          output = string_presence(read_pipe.gets)
          if output
            op, file = output.split('~~~', 2)
            @block.call(op, file[1..-2])
          end
        end
      end
    ensure
      parent_read.close
    end
  end

  parent_read.close
  @writer = parent_write

  nil
end

#stop_watcher ⇒ Object 



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# File 'lib/rust_watcher.rb', line 61

def stop_watcher
  if watcher_running?
    unless @writer.closed?
      @writer.write "."
      @writer.close
    end
    Process.kill("TERM", @watcher_pid)
  end

  if runner_running?
    Process.kill("TERM", @runner_pid)
  end

  nil
end