[PATCH] doc: document Fiber.current

[PATCH] doc: document Fiber.current

[Eric Wong]

It's always been supported (since it's just an eval), but make
it explicit.  We'll also drop the Actor.current example since
both Rubinius and Revactor seem dead and Ractor (Guild) is
probably coming...
---
 README               |  2 +-
 test/test_clogger.rb | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/README b/README
index c90dd1a..cdb8fba 100644
--- a/README
+++ b/README
@@ -89,7 +89,7 @@ that receives a "<<" method:
 * $ip - X-Forwarded-For request header if available, $remote_addr if not
 * $pid - process ID of the current process
 * $e{Thread.current} - Thread processing the request
-* $e{Actor.current} - Actor processing the request (Revactor or Rubinius)
+* $e{Fiber.current} - Fiber processing the request
 * $env{variable_name} - any Rack environment variable (e.g. rack.url_scheme)
 
 == REQUIREMENTS
diff --git a/test/test_clogger.rb b/test/test_clogger.rb
index b7dd4e9..1dee652 100644
--- a/test/test_clogger.rb
+++ b/test/test_clogger.rb
@@ -212,6 +212,22 @@ class TestClogger < Test::Unit::TestCase
     assert_equal "-#{current}-\n", str.string
   end
 
+  def test_fiber
+    begin
+      current = Fiber.current.to_s
+    rescue NameError => e
+      warn "your Ruby does not support fibers #{e}"
+      return
+    end
+    str = StringIO.new
+    app = lambda { |env| [ 302, {}, [] ] }
+    cl = Clogger.new(app,
+                    :logger => str,
+                    :format => "-$e{Fiber.current}-\n")
+    status, headers, body = cl.call(@req)
+    assert_equal "-#{current}-\n", str.string
+  end
+
   def test_pid
     str = StringIO.new
     app = lambda { |env| [ 302, {}, [] ] }