rake/helpers.rb
author Michael Granger <mgranger@laika.com>
Wed, 07 May 2008 18:22:04 +0000
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#####################################################################
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###	G L O B A L   H E L P E R   F U N C T I O N S
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#####################################################################
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require 'pathname'
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require 'readline'
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require 'open3'
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# Set some ANSI escape code constants (Shamelessly stolen from Perl's
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# Term::ANSIColor by Russ Allbery <rra@stanford.edu> and Zenin <zenin@best.com>
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ANSI_ATTRIBUTES = {
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	'clear'      => 0,
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	'reset'      => 0,
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	'bold'       => 1,
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	'dark'       => 2,
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	'underline'  => 4,
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	'underscore' => 4,
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	'blink'      => 5,
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	'reverse'    => 7,
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	'concealed'  => 8,
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	'black'      => 30,   'on_black'   => 40, 
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	'red'        => 31,   'on_red'     => 41, 
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	'green'      => 32,   'on_green'   => 42, 
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	'yellow'     => 33,   'on_yellow'  => 43, 
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	'blue'       => 34,   'on_blue'    => 44, 
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	'magenta'    => 35,   'on_magenta' => 45, 
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	'cyan'       => 36,   'on_cyan'    => 46, 
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	'white'      => 37,   'on_white'   => 47
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}
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CLEAR_TO_EOL       = "\e[K"
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CLEAR_CURRENT_LINE = "\e[2K"
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### Output a logging message
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def log( *msg )
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	output = colorize( msg.flatten.join(' '), 'cyan' )
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	$deferr.puts( output )
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end
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### Output a logging message if tracing is on
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def trace( *msg )
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	return unless $trace
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	output = colorize( msg.flatten.join(' '), 'yellow' )
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	$deferr.puts( output )
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end
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### Run the specified command +cmd+ with system(), failing if the execution
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### fails.
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def run( *cmd )
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	cmd.flatten!
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	log( cmd.collect {|part| part =~ /\s/ ? part.inspect : part} ) 
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	if $dryrun
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		$deferr.puts "(dry run mode)"
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	else
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		system( *cmd )
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		unless $?.success?
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			fail "Command failed: [%s]" % [cmd.join(' ')]
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		end
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	end
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end
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### Open a pipe to a process running the given +cmd+ and call the given block with it.
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def pipeto( *cmd )
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	$DEBUG = true
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	cmd.flatten!
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	log( "Opening a pipe to: ", cmd.collect {|part| part =~ /\s/ ? part.inspect : part} ) 
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	if $dryrun
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		$deferr.puts "(dry run mode)"
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	else
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		open( '|-', 'w+' ) do |io|
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			# Parent
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			if io
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				yield( io )
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			# Child
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			else
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				exec( *cmd )
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				fail "Command failed: [%s]" % [cmd.join(' ')]
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			end
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		end
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	end
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end
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### Download the file at +sourceuri+ via HTTP and write it to +targetfile+.
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def download( sourceuri, targetfile )
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	oldsync = $defout.sync
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	$defout.sync = true
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	require 'net/http'
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	require 'uri'
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	targetpath = Pathname.new( targetfile )
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	log "Downloading %s to %s" % [sourceuri, targetfile]
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	targetpath.open( File::WRONLY|File::TRUNC|File::CREAT, 0644 ) do |ofh|
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		url = URI.parse( sourceuri )
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		downloaded = false
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		limit = 5
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		until downloaded or limit.zero?
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			Net::HTTP.start( url.host, url.port ) do |http|
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				req = Net::HTTP::Get.new( url.path )
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				http.request( req ) do |res|
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					if res.is_a?( Net::HTTPSuccess )
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						log "Downloading..."
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						res.read_body do |buf|
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							ofh.print( buf )
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						end
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						downloaded = true
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						puts "done."
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					elsif res.is_a?( Net::HTTPRedirection )
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						url = URI.parse( res['location'] )
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						log "...following redirection to: %s" % [ url ]
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						limit -= 1
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						sleep 0.2
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						next
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					else
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						res.error!
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					end
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				end
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			end
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		end
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	end
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	return targetpath
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ensure
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	$defout.sync = oldsync
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end
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### Return the fully-qualified path to the specified +program+ in the PATH.
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def which( program )
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	ENV['PATH'].split(/:/).
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		collect {|dir| Pathname.new(dir) + program }.
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		find {|path| path.exist? && path.executable? }
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end
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### Create a string that contains the ANSI codes specified and return it
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def ansi_code( *attributes )
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	attributes.flatten!
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	attributes.collect! {|at| at.to_s }
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	# $deferr.puts "Returning ansicode for TERM = %p: %p" %
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	# 	[ ENV['TERM'], attributes ]
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	return '' unless /(?:vt10[03]|xterm(?:-color)?|linux|screen)/i =~ ENV['TERM']
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	attributes = ANSI_ATTRIBUTES.values_at( *attributes ).compact.join(';')
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	# $deferr.puts "  attr is: %p" % [attributes]
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	if attributes.empty? 
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		return ''
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   164
	else
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		return "\e[%sm" % attributes
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   166
	end
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end
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### Colorize the given +string+ with the specified +attributes+ and return it, handling 
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### line-endings, color reset, etc.
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def colorize( *args )
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	string = ''
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   174
	
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	if block_given?
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		string = yield
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	else
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		string = args.shift
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   179
	end
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	ending = string[/(\s)$/] || ''
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	string = string.rstrip
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   183
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	return ansi_code( args.flatten ) + string + ansi_code( 'reset' ) + ending
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   185
end
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   186
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### Output the specified <tt>msg</tt> as an ANSI-colored error message
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### (white on red).
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   190
def error_message( msg, details='' )
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   191
	$deferr.puts colorize( 'bold', 'white', 'on_red' ) { msg } + details
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   192
end
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   193
alias :error :error_message
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   194
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   195
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   196
### Highlight and embed a prompt control character in the given +string+ and return it.
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   197
def make_prompt_string( string )
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   198
	return CLEAR_CURRENT_LINE + colorize( 'bold', 'green' ) { string + ' ' }
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   199
end
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   200
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   201
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   202
### Output the specified <tt>prompt_string</tt> as a prompt (in green) and
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   203
### return the user's input with leading and trailing spaces removed.  If a
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   204
### test is provided, the prompt will repeat until the test returns true.
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   205
### An optional failure message can also be passed in.
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   206
def prompt( prompt_string, failure_msg="Try again." ) # :yields: response
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   207
	prompt_string.chomp!
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   208
	prompt_string << ":" unless /\W$/.match( prompt_string )
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   209
	response = nil
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   210
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   211
	begin
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		prompt = make_prompt_string( prompt_string )
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   213
		response = Readline.readline( prompt ) || ''
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   214
		response.strip!
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   215
		if block_given? && ! yield( response ) 
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   216
			error_message( failure_msg + "\n\n" )
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   217
			response = nil
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   218
		end
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   219
	end while response.nil?
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   220
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   221
	return response
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   222
end
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   223
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   224
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   225
### Prompt the user with the given <tt>prompt_string</tt> via #prompt,
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parents:
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   226
### substituting the given <tt>default</tt> if the user doesn't input
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parents:
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   227
### anything.  If a test is provided, the prompt will repeat until the test
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parents:
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   228
### returns true.  An optional failure message can also be passed in.
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parents:
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   229
def prompt_with_default( prompt_string, default, failure_msg="Try again." )
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   230
	response = nil
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   231
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   232
	begin
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   233
		response = prompt( "%s [%s]" % [ prompt_string, default ] )
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parents:
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   234
		response = default if response.empty?
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parents:
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   235
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   236
		if block_given? && ! yield( response ) 
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parents:
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   237
			error_message( failure_msg + "\n\n" )
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parents:
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   238
			response = nil
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   239
		end
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   240
	end while response.nil?
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parents:
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   241
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   242
	return response
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diff changeset
   243
end
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parents:
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   244
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   245
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   246
### Display a description of a potentially-dangerous task, and prompt
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parents:
diff changeset
   247
### for confirmation. If the user answers with anything that begins
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parents:
diff changeset
   248
### with 'y', yield to the block, else raise with an error.
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parents:
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   249
def ask_for_confirmation( description )
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   250
	puts description
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   251
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   252
	answer = prompt_with_default( "Continue?", 'n' ) do |input|
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parents:
diff changeset
   253
		input =~ /^[yn]/i
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parents:
diff changeset
   254
	end
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parents:
diff changeset
   255
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parents:
diff changeset
   256
	case answer
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parents:
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   257
	when /^y/i
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   258
		yield
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parents:
diff changeset
   259
	else
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   260
		error "Aborted."
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		fail
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	end
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end
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### Search line-by-line in the specified +file+ for the given +regexp+, returning the
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### first match, or nil if no match was found. If the +regexp+ has any capture groups,
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### those will be returned in an Array, else the whole matching line is returned.
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def find_pattern_in_file( regexp, file )
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	rval = nil
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	File.open( file, 'r' ).each do |line|
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		if (( match = regexp.match(line) ))
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			rval = match.captures.empty? ? match[0] : match.captures
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			break
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		end
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	end
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	return rval
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end
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### Search line-by-line in the output of the specified +cmd+ for the given +regexp+,
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### returning the first match, or nil if no match was found. If the +regexp+ has any 
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### capture groups, those will be returned in an Array, else the whole matching line
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### is returned.
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def find_pattern_in_pipe( regexp, *cmd )
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	output = []
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	Open3.popen3( *cmd ) do |stdin, stdout, stderr|
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		stdin.close
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		output << stdout.gets until stdout.eof?
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		output << stderr.gets until stderr.eof?
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	end
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	result = output.find { |line| regexp.match(line) } 
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	return $1 || result
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   299
end
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### Extract all the non Rake-target arguments from ARGV and return them.
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def get_target_args
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	args = ARGV.reject {|arg| Rake::Task.task_defined?(arg) }
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	return args
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   306
end
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require 'rubygems/dependency_installer'
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require 'rubygems/source_index'
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require 'rubygems/requirement'
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require 'rubygems/doc_manager'
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### Install the specified +gems+ if they aren't already installed.
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def install_gems( *gems )
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	gems.flatten!
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   318
	
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   319
	defaults = Gem::DependencyInstaller::DEFAULT_OPTIONS.merge({
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   320
		:generate_rdoc     => true,
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   321
		:generate_ri       => true,
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   322
		:install_dir       => Gem.dir,
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   323
		:format_executable => false,
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   324
		:test              => false,
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   325
		:version           => Gem::Requirement.default,
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   326
	  })
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   327
    
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   328
	# Check for root
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   329
	if Process.euid != 0
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   330
		$stderr.puts "This probably won't work, as you aren't root, but I'll try anyway"
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   331
	end
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   332
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   333
	gemindex = Gem::SourceIndex.from_installed_gems
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   334
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   335
	gems.each do |gemname|
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   336
		if (( specs = gemindex.search(gemname) )) && ! specs.empty?
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   337
			log "Version %s of %s is already installed; skipping..." % 
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   338
				[ specs.first.version, specs.first.name ]
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   339
			next
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   340
		end
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   341
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   342
		log "Trying to install #{gemname.inspect}..."
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   343
		installer = Gem::DependencyInstaller.new
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   344
		installer.install( gemname )
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   345
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   346
		installer.installed_gems.each do |spec|
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   347
			log "Installed: %s" % [ spec.full_name ]
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   348
		end
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   349
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   350
	end
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   351
end
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   352
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   353