Merge pull request #804 from sideshowcoder/add_dir_exists

add Dir#exist? and Dir#exists?

lib-topaz/bootstrap.rb

@@ -15,6 +15,7 @@
 load_bootstrap.call("errno.rb")
 load_bootstrap.call("file.rb")
 load_bootstrap.call("fixnum.rb")
+load_bootstrap.call("dir.rb")
 load_bootstrap.call("hash.rb")
 load_bootstrap.call("integer.rb")
 load_bootstrap.call("io.rb")

lib-topaz/dir.rb

@@ -0,0 +1,18 @@
+class Dir
+
+  def self.exists?(dirname)
+    if dirname.respond_to?(:to_path)
+      dirname = dirname.to_path
+    end
+    begin
+      !!new(dirname)
+    rescue Errno::ENOENT, Errno::ENOTDIR
+      false
+    end
+  end
+
+  class << self
+    alias :exist? :exists?
+  end
+
+end

spec/tags/core/dir/exist_tags.txt

@@ -1,11 +1 @@
-fails:Dir.exist? returns true if the given directory exists
-fails:Dir.exist? returns true for '.'
-fails:Dir.exist? returns true for '..'
-fails:Dir.exist? understands non-ASCII paths
-fails:Dir.exist? understands relative paths
-fails:Dir.exist? returns false if the given directory doesn't exist
 fails:Dir.exist? doesn't require the name to have a trailing slash
-fails:Dir.exist? doesn't expand paths
-fails:Dir.exist? returns false if the argument exists but is a file
-fails:Dir.exist? calls #to_path on non String arguments
-fails:Dir.exist? doesn't set $! when file doesn't exist

spec/tags/core/dir/exists_tags.txt

@@ -1,11 +1 @@
-fails:Dir.exists? returns true if the given directory exists
-fails:Dir.exists? returns true for '.'
-fails:Dir.exists? returns true for '..'
-fails:Dir.exists? understands non-ASCII paths
-fails:Dir.exists? understands relative paths
-fails:Dir.exists? returns false if the given directory doesn't exist
 fails:Dir.exists? doesn't require the name to have a trailing slash
-fails:Dir.exists? doesn't expand paths
-fails:Dir.exists? returns false if the argument exists but is a file
-fails:Dir.exists? calls #to_path on non String arguments
-fails:Dir.exists? doesn't set $! when file doesn't exist