Move vpath.rb into tool library direcotry.

tool/lib/vpath.rb

@@ -0,0 +1,87 @@
+# -*- coding: us-ascii -*-
+
+class VPath
+  attr_accessor :separator
+
+  def initialize(*list)
+    @list = list
+    @additional = []
+    @separator = nil
+  end
+
+  def inspect
+    list.inspect
+  end
+
+  def search(meth, base, *rest)
+    begin
+      meth.call(base, *rest)
+    rescue Errno::ENOENT => error
+      list.each do |dir|
+        return meth.call(File.join(dir, base), *rest) rescue nil
+      end
+      raise error
+    end
+  end
+
+  def process(*args, &block)
+    search(File.method(__callee__), *args, &block)
+  end
+
+  alias stat process
+  alias lstat process
+
+  def open(*args)
+    f = search(File.method(:open), *args)
+    if block_given?
+      begin
+        yield f
+      ensure
+        f.close unless f.closed?
+      end
+    else
+      f
+    end
+  end
+
+  def read(*args)
+    open(*args) {|f| f.read}
+  end
+
+  def foreach(file, *args, &block)
+    open(file) {|f| f.each(*args, &block)}
+  end
+
+  def def_options(opt)
+    opt.on("-I", "--srcdir=DIR", "add a directory to search path") {|dir|
+      @additional << dir
+    }
+    opt.on("-L", "--vpath=PATH LIST", "add directories to search path") {|dirs|
+      @additional << [dirs]
+    }
+    opt.on("--path-separator=SEP", /\A(?:\W\z|\.(\W).+)/, "separator for vpath") {|sep, vsep|
+      # hack for msys make.
+      @separator = vsep || sep
+    }
+  end
+
+  def list
+    @additional.reject! do |dirs|
+      case dirs
+      when String
+        @list << dirs
+      when Array
+        raise "--path-separator option is needed for vpath list" unless @separator
+        # @separator ||= (require 'rbconfig'; RbConfig::CONFIG["PATH_SEPARATOR"])
+        @list.concat(dirs[0].split(@separator))
+      end
+      true
+    end
+    @list
+  end
+
+  def strip(path)
+    prefix = list.map {|dir| Regexp.quote(dir)}
+    path.sub(/\A#{prefix.join('|')}(?:\/|\z)/, '')
+  end
+end