#

#	Install/distribution utility functions

#	$Id$

#

#	Copyright (c) 2001-2005, The FaerieMUD Consortium.

#

#	This is free software. You may use, modify, and/or redistribute this

#	software under the terms of the Perl Artistic License. (See

#	http://language.perl.com/misc/Artistic.html)

#

BEGIN {

	require 'rbconfig'

	require 'uri'

	require 'find'

	require 'pp'

	begin

		require 'readline'

		include Readline

	rescue LoadError => e

		$stderr.puts "Faking readline..."

		def readline( prompt )

			$stderr.print prompt.chomp

			return $stdin.gets.chomp

		end

	end

	begin

		require 'yaml'

		$yaml = true

	rescue LoadError => e

		$stderr.puts "No YAML; try() will use PrettyPrint instead."

		$yaml = false

	end

}

module UtilityFunctions

	include Config

	# The list of regexen that eliminate files from the MANIFEST

	ANTIMANIFEST = [

		/makedist\.rb/,

		/\bCVS\b/,

		/~$/,

		/^#/,

		%r{docs/html},

		%r{docs/man},

		/\bTEMPLATE\.\w+\.tpl\b/,

		/\.cvsignore/,

		/\.s?o$/,

	]

	# Set some ANSI escape code constants (Shamelessly stolen from Perl's

	# Term::ANSIColor by Russ Allbery <rra@stanford.edu> and Zenin <zenin@best.com>

	AnsiAttributes = {

		'clear'      => 0,

		'reset'      => 0,

		'bold'       => 1,

		'dark'       => 2,

		'underline'  => 4,

		'underscore' => 4,

		'blink'      => 5,

		'reverse'    => 7,

		'concealed'  => 8,

		'black'      => 30,   'on_black'   => 40, 

		'red'        => 31,   'on_red'     => 41, 

		'green'      => 32,   'on_green'   => 42, 

		'yellow'     => 33,   'on_yellow'  => 43, 

		'blue'       => 34,   'on_blue'    => 44, 

		'magenta'    => 35,   'on_magenta' => 45, 

		'cyan'       => 36,   'on_cyan'    => 46, 

		'white'      => 37,   'on_white'   => 47

	}

	ErasePreviousLine = "\033[A\033[K"

	ManifestHeader = (<<-"EOF").gsub( /^\t+/, '' )

		#

		# Distribution Manifest

		# Created: #{Time::now.to_s}

		# 

	EOF

	###############

	module_function

	###############

	# Create a string that contains the ANSI codes specified and return it

	def ansiCode( *attributes )

		return '' unless /(?:vt10[03]|xterm(?:-color)?|linux|screen)/i =~ ENV['TERM']

		attr = attributes.collect {|a| AnsiAttributes[a] ? AnsiAttributes[a] : nil}.compact.join(';')

		if attr.empty? 

			return ''

		else

			return "\e[%sm" % attr

		end

	end

	# Test for the presence of the specified <tt>library</tt>, and output a

	# message describing the test using <tt>nicename</tt>. If <tt>nicename</tt>

	# is <tt>nil</tt>, the value in <tt>library</tt> is used to build a default.

	def testForLibrary( library, nicename=nil, progress=false )

		nicename ||= library

		message( "Testing for the #{nicename} library..." ) if progress

		if $LOAD_PATH.detect {|dir|

				File.exists?(File.join(dir,"#{library}.rb")) ||

				File.exists?(File.join(dir,"#{library}.#{CONFIG['DLEXT']}"))

			}

			message( "found.\n" ) if progress

			return true

		else

			message( "not found.\n" ) if progress

			return false

		end

	end

	# Test for the presence of the specified <tt>library</tt>, and output a

	# message describing the problem using <tt>nicename</tt>. If

	# <tt>nicename</tt> is <tt>nil</tt>, the value in <tt>library</tt> is used

	# to build a default. If <tt>raaUrl</tt> and/or <tt>downloadUrl</tt> are

	# specified, they are also use to build a message describing how to find the

	# required library. If <tt>fatal</tt> is <tt>true</tt>, a missing library

	# will cause the program to abort.

	def testForRequiredLibrary( library, nicename=nil, raaUrl=nil, downloadUrl=nil, fatal=true )

		nicename ||= library

		unless testForLibrary( library, nicename )

			msgs = [ "You are missing the required #{nicename} library.\n" ]

			msgs << "RAA: #{raaUrl}\n" if raaUrl

			msgs << "Download: #{downloadUrl}\n" if downloadUrl

			if fatal

				abort msgs.join('')

			else

				errorMessage msgs.join('')

			end

		end

		return true

	end

	### Output <tt>msg</tt> as a ANSI-colored program/section header (white on

	### blue).

	def header( msg )

		msg.chomp!

		$stderr.puts ansiCode( 'bold', 'white', 'on_blue' ) + msg + ansiCode( 'reset' )

		$stderr.flush

	end

	### Output <tt>msg</tt> to STDERR and flush it.

	def message( *msgs )

		$stderr.print( msgs.join("\n") )

		$stderr.flush

	end

	### Output +msg+ to STDERR and flush it if $VERBOSE is true.

	def verboseMsg( msg )

		msg.chomp!

		message( msg + "\n" ) if $VERBOSE

	end

	### Output the specified <tt>msg</tt> as an ANSI-colored error message

	### (white on red).

	def errorMessage( msg )

		message ansiCode( 'bold', 'white', 'on_red' ) + msg + ansiCode( 'reset' )

	end

	### Output the specified <tt>msg</tt> as an ANSI-colored debugging message

	### (yellow on blue).

	def debugMsg( msg )

		return unless $DEBUG

		msg.chomp!

		$stderr.puts ansiCode( 'bold', 'yellow', 'on_blue' ) + ">>> #{msg}" + ansiCode( 'reset' )

		$stderr.flush

	end

	### Erase the previous line (if supported by your terminal) and output the

	### specified <tt>msg</tt> instead.

	def replaceMessage( msg )

		$stderr.print ErasePreviousLine

		message( msg )

	end

	### Output a divider made up of <tt>length</tt> hyphen characters.

	def divider( length=75 )

		$stderr.puts "\r" + ("-" * length )

	end

	alias :writeLine :divider

	### Output the specified <tt>msg</tt> colored in ANSI red and exit with a

	### status of 1.

	def abort( msg )

		print ansiCode( 'bold', 'red' ) + "Aborted: " + msg.chomp + ansiCode( 'reset' ) + "\n\n"

		Kernel.exit!( 1 )

	end

	### Output the specified <tt>promptString</tt> as a prompt (in green) and

	### return the user's input with leading and trailing spaces removed.  If a

	### test is provided, the prompt will repeat until the test returns true.

	### An optional failure message can also be passed in.

	def prompt( promptString, failure_msg="Try again." ) # :yields: response

		promptString.chomp!

		response = nil

		begin

			response = readline( ansiCode('bold', 'green') +

				"#{promptString}: " + ansiCode('reset') ).strip

			if block_given? && ! yield( response ) 

				errorMessage( failure_msg + "\n\n" )

				response = nil

			end

		end until response

		return response

	end

	### Prompt the user with the given <tt>promptString</tt> via #prompt,

	### substituting the given <tt>default</tt> if the user doesn't input

	### anything.  If a test is provided, the prompt will repeat until the test

	### returns true.  An optional failure message can also be passed in.

	def promptWithDefault( promptString, default, failure_msg="Try again." )

		response = nil

		begin

			response = prompt( "%s [%s]" % [ promptString, default ] )

			response = default if response.empty?

			if block_given? && ! yield( response ) 

				errorMessage( failure_msg + "\n\n" )

				response = nil

			end

		end until response

		return response

	end

	$programs = {}

	### Search for the program specified by the given <tt>progname</tt> in the

	### user's <tt>PATH</tt>, and return the full path to it, or <tt>nil</tt> if

	### no such program is in the path.

	def findProgram( progname )

		unless $programs.key?( progname )

			ENV['PATH'].split(File::PATH_SEPARATOR).each {|d|

				file = File.join( d, progname )

				if File.executable?( file )

					$programs[ progname ] = file 

					break

				end

			}

		end

		return $programs[ progname ]

	end

	### Search for the release version for the project in the specified

	### +directory+.

	def extractVersion( directory='.' )

		release = nil

		Dir::chdir( directory ) do

			if File::directory?( "CVS" )

				verboseMsg( "Project is versioned via CVS. Searching for RELEASE_*_* tags..." )

				if (( cvs = findProgram('cvs') ))

					revs = []

					output = %x{cvs log}

					output.scan( /RELEASE_(\d+(?:_\d\w+)*)/ ) {|match|

						rev = $1.split(/_/).collect {|s| Integer(s) rescue 0}

						verboseMsg( "Found %s...\n" % rev.join('.') )

						revs << rev

					}

					release = revs.sort.last

				end

			elsif File::directory?( '.svn' )

				verboseMsg( "Project is versioned via Subversion" )

				if (( svn = findProgram('svn') ))

					output = %x{svn pg project-version}.chomp

					unless output.empty?

						verboseMsg( "Using 'project-version' property: %p" % output )

						release = output.split( /[._]/ ).collect {|s| Integer(s) rescue 0}

					end

				end

			end

		end

		return release

	end

	### Find the current release version for the project in the specified

	### +directory+ and return its successor.

	def extractNextVersion( directory='.' )

		version = extractVersion( directory ) || [0,0,0]

		version.compact!

		version[-1] += 1

		return version

	end

	# Pattern for extracting the name of the project from a Subversion URL

	SVNUrlPath = %r{

		.*/						# Skip all but the last bit

		([^/]+)					# $1 = project name

		/						# Followed by / +

		(?:

			trunk |				# 'trunk'

			(

				branches |		# ...or branches/branch-name

				tags			# ...or tags/tag-name

			)/\w	

		)

		$						# bound to the end

	}ix

	### Extract the project name (CVS Repository name) for the given +directory+.

	def extractProjectName( directory='.' )

		name = nil

		Dir::chdir( directory ) do

			# CVS-controlled

			if File::directory?( "CVS" )

				verboseMsg( "Project is versioned via CVS. Using repository name." )

				name = File.open( "CVS/Repository", "r").readline.chomp

				name.sub!( %r{.*/}, '' )

			# Subversion-controlled

			elsif File::directory?( '.svn' )

				verboseMsg( "Project is versioned via Subversion" )

				# If the machine has the svn tool, try to get the project name

				if (( svn = findProgram( 'svn' ) ))

					# First try an explicit property

					output = shellCommand( svn, 'pg', 'project-name' )

					if !output.empty?

						verboseMsg( "Using 'project-name' property: %p" % output )

						name = output.first.chomp

					# If that doesn't work, try to figure it out from the URL

					elsif (( uri = getSvnUri() ))

						name = uri.path.sub( SVNUrlPath ) { $1 }

					end

				end

			end

			# Fall back to guessing based on the directory name

			unless name

				name = File::basename(File::dirname( File::expand_path(__FILE__) ))

			end

		end

		return name

	end

	### Extract the Subversion URL from the specified directory and return it as

	### a URI object.

	def getSvnUri( directory='.' )

		uri = nil

		Dir::chdir( directory ) do

			output = %x{svn info}

			debugMsg( "Using info: %p" % output )

			if /^URL: \s* ( .* )/xi.match( output )

				uri = URI::parse( $1 )

			end

		end

		return uri

	end

	### (Re)make a manifest file in the specified +path+.

	def makeManifest( path="MANIFEST" )

		if File::exists?( path )

			reply = promptWithDefault( "Replace current '#{path}'? [yN]", "n" )

			return false unless /^y/i.match( reply )

			verboseMsg "Replacing manifest at '#{path}'"

		else

			verboseMsg "Creating new manifest at '#{path}'"

		end

		files = []

		verboseMsg( "Finding files...\n" )

		Find::find( Dir::pwd ) do |f|

			Find::prune if File::directory?( f ) &&

				/^\./.match( File::basename(f) )

			verboseMsg( "  found: #{f}\n" )

			files << f.sub( %r{^#{Dir::pwd}/?}, '' )

		end

		files = vetManifest( files )

		verboseMsg( "Writing new manifest to #{path}..." )

		File::open( path, File::WRONLY|File::CREAT|File::TRUNC ) do |ofh|

			ofh.puts( ManifestHeader )

			ofh.puts( files )

		end

		verboseMsg( "done." )

	end

	### Read the specified <tt>manifestFile</tt>, which is a text file

	### describing which files to package up for a distribution. The manifest

	### should consist of one or more lines, each containing one filename or

	### shell glob pattern.

	def readManifest( manifestFile="MANIFEST" )

		verboseMsg "Building manifest..."

		raise "Missing #{manifestFile}, please remake it" unless File.exists? manifestFile

		manifest = IO::readlines( manifestFile ).collect {|line|

			line.chomp

		}.select {|line|

			line !~ /^(\s*(#.*)?)?$/

		}

		filelist = []

		for pat in manifest

			verboseMsg "Adding files that match '#{pat}' to the file list"

			filelist |= Dir.glob( pat ).find_all {|f| FileTest.file?(f)}

		end

		verboseMsg "found #{filelist.length} files.\n"

		return filelist

	end

	### Given a <tt>filelist</tt> like that returned by #readManifest, remove

	### the entries therein which match the Regexp objects in the given

	### <tt>antimanifest</tt> and return the resultant Array.

	def vetManifest( filelist, antimanifest=ANTIMANIFEST )

		origLength = filelist.length

		verboseMsg "Vetting manifest..."

		for regex in antimanifest

			verboseMsg "\n\tPattern /#{regex.source}/ removed: " +

				filelist.find_all {|file| regex.match(file)}.join(', ')

			filelist.delete_if {|file| regex.match(file)}

		end

		verboseMsg "removed #{origLength - filelist.length} files from the list.\n"

		return filelist

	end

	### Combine a call to #readManifest with one to #vetManifest.

	def getVettedManifest( manifestFile="MANIFEST", antimanifest=ANTIMANIFEST )

		vetManifest( readManifest(manifestFile), antimanifest )

	end

	### Given a documentation <tt>catalogFile</tt>, extract the title, if

	### available, and return it. Otherwise generate a title from the name of

	### the CVS module.

	def findRdocTitle( catalogFile="docs/CATALOG" )

		# Try extracting it from the CATALOG file from a line that looks like:

		# Title: Foo Bar Module

		title = findCatalogKeyword( 'title', catalogFile )

		# If that doesn't work for some reason, use the name of the project.

		title = extractProjectName()

		return title

	end

	### Given a documentation <tt>catalogFile</tt>, extract the name of the file

	### to use as the initally displayed page. If extraction fails, the

	### +default+ will be used if it exists. Returns +nil+ if there is no main

	### file to be found.

	def findRdocMain( catalogFile="docs/CATALOG", default="README" )

		# Try extracting it from the CATALOG file from a line that looks like:

		# Main: Foo Bar Module

		main = findCatalogKeyword( 'main', catalogFile )

		# Try to make some educated guesses if that doesn't work

		if main.nil?

			basedir = File::dirname( __FILE__ )

			basedir = File::dirname( basedir ) if /docs$/ =~ basedir

			if File::exists?( File::join(basedir, default) )

				main = default

			end

		end

		return main

	end

	### Given a documentation <tt>catalogFile</tt>, extract an upload URL for

	### RDoc.

	def findRdocUpload( catalogFile="docs/CATALOG" )

		findCatalogKeyword( 'upload', catalogFile )

	end

	### Given a documentation <tt>catalogFile</tt>, extract a CVS web frontend

	### URL for RDoc.

	def findRdocCvsURL( catalogFile="docs/CATALOG" )

		findCatalogKeyword( 'webcvs', catalogFile )

	end

	### Find one or more 'accessor' directives in the catalog if they exist and

	### return an Array of them.

	def findRdocAccessors( catalogFile="docs/CATALOG" )

		accessors = []

		in_attr_section = false

		indent = ''

		if File::exists?( catalogFile )

			verboseMsg "Extracting accessors from CATALOG file (%s).\n" % catalogFile

			# Read lines from the catalog