class Buildr::Console
A utility class that helps with colorizing output for interactive shells where appropriate
Public Class Methods
agree?(message)
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# File lib/buildr/core/console.rb, line 75 def agree?(message) puts "#{message} (Y or N)" :agree == ask('Y' => :agree, 'N' => :disagree) end
ask_password(prompt)
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# File lib/buildr/core/console.rb, line 80 def ask_password(prompt) puts prompt begin set_no_echo_mode password = $stdin.readline return password.chomp ensure reset_mode end end
color(message, color)
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Emit message with color at the start of the message and the clear color command at the end of the sequence.
# File lib/buildr/core/console.rb, line 31 def color(message, color) raise "Unknown color #{color.inspect}" unless [:green, :red, :blue].include?(color) return message unless use_color constants = {:green => "\e[32m", :red => "\e[31m", :blue => "\e[34m"} @java_console.putString("#{constants[color]}#{message}\e[0m") if @java_console "#{constants[color]}#{message}\e[0m" end
console_dimensions()
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Return the [rows, columns] of a console or nil if unknown
# File lib/buildr/core/console.rb, line 40 def console_dimensions return nil unless setup_support begin if Buildr::Util.win_os? if Buildr::Util.java_platform? if JRUBY_VERSION =~ /^1.7/ [@java_terminal.get_width, @java_terminal.get_height] else [@java_terminal.getTerminalWidth, @java_terminal.getTerminalHeight] end else Win32::Console.new(Win32::Console::STD_OUTPUT_HANDLE).MaxWindow end elsif $stdout.isatty if /solaris/ =~ RUBY_PLATFORM and `stty` =~ /\brows = (\d+).*\bcolumns = (\d+)/ [$2, $1].map { |c| x.to_i } else `stty size 2> /dev/null`.split.map { |x| x.to_i }.reverse end else nil end rescue => e nil end end
output_cols()
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Return the number of columns in console or nil if unknown
# File lib/buildr/core/console.rb, line 70 def output_cols d = console_dimensions d ? d[0] : nil end
use_color()
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# File lib/buildr/core/console.rb, line 21 def use_color @use_color.nil? ? false : @use_color end
use_color=(use_color)
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# File lib/buildr/core/console.rb, line 25 def use_color=(use_color) return if use_color && !setup_support @use_color = use_color end
Private Class Methods
ask(options)
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# File lib/buildr/core/console.rb, line 140 def ask(options) keys = options.keys keys_downcased = keys.collect { |k| k.downcase } result = nil show_prompt = false until keys_downcased.include?(result) puts "Invalid response. Valid responses include: #{keys.join(', ')}\n" if show_prompt show_prompt = true result = $stdin.readline result = result.strip.downcase if result end options.each_pair do |key, value| if key.downcase == result return value.is_a?(Proc) ? value.call : value end end return nil end
reset_mode()
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# File lib/buildr/core/console.rb, line 123 def reset_mode return unless setup_support if Buildr::Util.win_os? if Buildr::Util.java_platform? if @java_console @java_console.setEchoCharacter @state end else c = Win32::Console.new(Win32::Console::STD_OUTPUT_HANDLE) c.Echo(true) rescue Exception end else `stty #{@state} 2>/dev/null` end @state = nil end
set_no_echo_mode()
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# File lib/buildr/core/console.rb, line 105 def set_no_echo_mode return unless setup_support if Buildr::Util.win_os? if Buildr::Util.java_platform? if @java_console @state = @java_console.getEchoCharacter @java_console.setEchoCharacter 0 end else c = Win32::Console.new(Win32::Console::STD_OUTPUT_HANDLE) c.Echo(false) rescue Exception end else @state = `stty -g 2>/dev/null` `stty -echo -icanon 2>/dev/null` end end
setup_support()
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# File lib/buildr/core/console.rb, line 159 def setup_support return @initialized unless @initialized.nil? @initialized = false begin if Buildr::Util.win_os? if Buildr::Util.java_platform? require 'java' require 'readline' begin # Attempt jline1 java_import 'java.io.OutputStreamWriter' java_import 'java.nio.channels.Channels' java_import 'jline.ConsoleReader' java_import 'jline.Terminal' @java_input = Java::JavaNioChannels::Channels.newInputStream($stdin.to_channel) @java_output = Java::JavaIo.OutputStreamWriter.new(Java::JavaNioChannels::Channels.newOutputStream($stdout.to_channel)) @java_terminal = Java::Jline::Terminal.getTerminal @java_console = Java::Jline::ConsoleReader.new(@java_input, @java_output) @java_console.setUseHistory(false) @java_console.set_bell_enabled(true) @java_console.setUsePagination(false) rescue Exception # attempt jline 2 java_import 'jline.console.ConsoleReader' @java_console = ConsoleReader.new($stdin.to_inputstream, $stdout.to_outputstream) @java_console.set_history_enabled(false) @java_console.set_bell_enabled(true) @java_console.set_pagination_enabled(false) @java_terminal = @java_console.getTerminal end return false else require 'Win32/Console/ANSI' end end rescue # Unfortunately we have multiple incompatible jline libraries # in the classpath. This is probably because we are using jruby # 1.7.5 with a library like scala and both use incompatible jline # implementations return false rescue NameError return false rescue LoadError return false end @initialized = true return true end