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#!/usr/local/bin/ruby
# pkg-plist generator by Brian Fundakowski Feldman <green@FreeBSD.org>
# (public domain)
# $FreeBSD$

class Plist
	def initialize(no_manpages = true, mtree = [])
		@no_manpages = no_manpages
		@mtree = mtree
		self
	end
	def make(dir)
		@root = dir.to_s + '/'
		imake('', 0, '')
	end
	private
	def imake(dir, level, prevwd)
		thiswd = prevwd + dir				# always ends in '/'
		rootedwd = @root + thiswd
		subs = []
		Dir.foreach(rootedwd) {|dirent|
			next if dirent =~ /^\.\.?$/
			if test(?d, rootedwd + dirent)
				subs.concat(imake(dirent + '/', level + 1, thiswd))
			else
				if thiswd !~ /^man\// || !@no_manpages
						subs.push(thiswd + dirent)
				end
			end
		}
		thiswd.chop!
		# Strip mtree-created directories
		if level > 0 && !@mtree.find {|x| x == thiswd}
			subs.push('@dirrm ' + thiswd)
		end
		return subs
	end
end

class Mtree
	def initialize(strip = 1)
		@paths = []
		@curlevel = []
		@strip = strip.to_i
		@cont = false
		self
	end
	def parse_line(line)
		line.chomp!
		spline = line.split
		oldcont = @cont
		@cont = line[-1, 1] == "\\"
		case spline[0]
		when nil
		when /^[\/#]/
			# ignore "command" lines and comments
		when '..'
			if oldcont
				raise 'continued line has a .. directive?!'
			end
			if @curlevel.pop.nil?
				raise '".." with no previous directory'
			end
		else
			if !oldcont
				@curlevel.push(spline[0])
				@paths.push(@curlevel.dup)
			end
		end
		self
	end
	def Mtree.read(filename)
		m = Mtree.new
		open(filename, 'r') {|file|
			file.each_line {|line| m.parse_line(line)}
		}
		m
	end
	def paths(strip = @strip)
		@paths.collect {|path| path[strip..-1].join('/')}
	end
end

if __FILE__ == $0
	require 'getopts'
	if !getopts('Md', 'm:') || ARGV.size != 1
		$stderr.print <<-USAGE_EOF
usage: #{$0} [-Md] [-m mtree] somepath
       Generate a pkg-plist to stdout given a previously empty somepath which
       a port has been installed into (PREFIX=somepath).  The mtree file is
       consulted to prevent base directories from being added to the plist.
       The -M argument allows manpages to be added to the plist.
       The -d argument puts all @dirrm commands at the end of the plist.
USAGE_EOF
		exit 1
	end
	mtree = $OPT_m || '/etc/mtree/BSD.local.dist'
	pl = Plist.new(!$OPT_M, Mtree.read(mtree).paths).make(ARGV[0])
	if $OPT_d
		plnotdirrm = []
		pldirrm = []
		pl.each {|ent|
			if ent =~ /^@dirrm /
				pldirrm.push(ent)
			else
				plnotdirrm.push(ent)
			end
			pl = plnotdirrm + pldirrm
		}
	end
	puts(pl.join("\n"))
end