Class: Google_search_cmdline::Interface

Inherits:
Object
  • Object
show all
Defined in:
lib/google_search_cmdline_interface.rb

Overview

This class starts a interactive interface based on a ‘in’-IO and ‘out-IO. If none is given, then ’stdout’ and ‘stdin’ will be used.

Examples

interface = Google_search_cmdline::Interface.new(:gsc => gsc)

Constant Summary collapse

ALLOWED_ARGUMENTS = 
[:debug, :gsc, :io_out, :io_in]

Instance Method Summary collapse

Constructor Details

#initialize(args = {}) ⇒ Interface

Constructor.



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# File 'lib/google_search_cmdline_interface.rb', line 8

def initialize(args = {})
  @args = args
  @args.each do |key, val|
    raise "Invalid argument: '#{key}'." if !ALLOWED_ARGUMENTS.include?(key)
  end
  
  #Used to execute Google-searches.
  @gsc = @args[:gsc]
  raise "No ':gsc'-argument was given. This should be a 'Google_search_cmdline' or compatible." if !@gsc
  
  #Take IO's from arguments or std-IO's.
  if @args[:io_out]
    @io_out = @args[:io_out]
  else
    @io_out = $stdout
  end
  
  if @args[:io_in]
    @io_in = @args[:io_in]
  else
    @io_in = $stdin
  end
  
  #If not synced buffers will ruin the application.
  @io_out.sync = true
  @io_in.sync = true
  
  #Commands that should be called directly on the interface-object.
  direct_cmds = ["exit", "help"]
  
  @io_out.puts "Welcome to Google Search Cmdline."
  
  @io_in.each_line do |line_full|
    begin
      line = line_full[0, line_full.length - 1]
      puts "Got line: '#{line}'." if @args[:debug]
      
      if match = line.match(/^search\s+(.+)$/)
        @io_out.puts "Searching - please wait..."
        search_text = match[1]
        results = @gsc.search(search_text)
        self.cmd_search(results)
      elsif direct_cmds.include?(line)
        self.__send__("cmd_#{line}")
      elsif line.to_s.strip.empty?
        #ignore.
      else
        @io_out.puts "Can't understand that command: '#{line}'. Try 'help' to see available commands."
      end
    rescue => e
      @io_out.puts "An error occurred: '#{e.message}'."
      @io_out.puts "Backtrace:"
      @io_out.puts e.backtrace.join("\n")
      @io_out.puts ""
    end
  end
end

Instance Method Details

#cmd_exit ⇒ Object

Called when ‘exit’.



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# File 'lib/google_search_cmdline_interface.rb', line 90

def cmd_exit
  @io_out.puts "Goodbye."
  exit
end

#cmd_help ⇒ Object

Called when ‘help’. Shows a help-message explaining various available commands.



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# File 'lib/google_search_cmdline_interface.rb', line 96

def cmd_help
  @io_out.puts "Available commands:"
  @io_out.puts " exit           - Ends the application."
  @io_out.puts " help           - Shows this message."
  @io_out.puts " search [text]  - Executes a Google search and shots the results."
  @io_out.puts ""
end

#cmd_search(results) ⇒ Object

Called when ‘search [something]’. Shows the results of the search.



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# File 'lib/google_search_cmdline_interface.rb', line 67

def cmd_search(results)
  count = 0
  results.each do |result|
    count += 1
    
    @io_out.puts "Result #{count} - #{result.title}"
    @io_out.puts "URL: #{result.url}"
    @io_out.puts " "
    
    if count >= 8
      @io_out.puts "The maximum of 8 results was found. Please be more specific."
      break
    end
  end
  
  if count <= 0
    @io_out.puts "No results was found (which is very very weird)."
  end
  
  @io_out.puts ""
end