Add initial version of debugger support

Use Rubinus::Debugger but provide some fancy-specific output on method
names / signatures etc.

lib/main.fy

@@ -21,6 +21,7 @@ if: (ARGV size == 1) then: {
      "  -e 'command'            One line of Fancy code that gets evaluated immediately",
      "  -c [filenames]          Compile given files to Rubinius bytecode",
      "  -cv [filenames]         Compile given files to Rubinius bytecode verbosely (outputting the generated bytecode)",
+     "  -debug                  Start the Rubinius Debugger with Fancy",
      "",
      "Fancy package management:",
      "  install   [packagename] Install a Fancy package with a given name to $FANCYPACK_DIR",
@@ -65,6 +66,10 @@ ARGV for_option: "-cv" do: {
   System exit
 }
 
+ARGV for_option: "-debug" do: {
+  require: "rbx/debugger"
+}
+
 ARGV for_option: "install" do: |package_name| {
   match package_name {
     case "--deps" -> Fancy Package install_dependencies

lib/rbx.fy

@@ -42,3 +42,4 @@ require: "rbx/actor"
 require: "rbx/mutex"
 require: "rbx/module"
 require: "rbx/proc"
+require: "rbx/compiled_method"

lib/rbx/compiled_method.fy

@@ -0,0 +1,14 @@
+class Rubinius CompiledMethod {
+  forwards_unary_ruby_methods
+
+  def selectors_with_args {
+    local_names = local_names to_a
+    if: (required_args > 0) then: {
+      name to_s split: ":" . map_with_index: |sel i| {
+        "#{sel}: #{local_names[i]}"
+      } . join: " "
+    } else: {
+      name to_s rest
+    }
+  }
+}

lib/rbx/debugger.fy

@@ -0,0 +1,72 @@
+require("rubinius/debugger")
+
+class Rubinius Debugger {
+  forwards_unary_ruby_methods
+  metaclass forwards_unary_ruby_methods
+}
+
+class Rubinius Debugger Command SetBreakPoint {
+  def match_method: method_identifier {
+    match method_identifier {
+      case /##/ ->
+        class_name, method_name = method_identifier split: "##"
+        method_identifier = "#{class_name}::#{method_name message_name}"
+      case /#/ ->
+        class_name, method_name = method_identifier split: "#"
+        method_identifier = "#{class_name}##{method_name message_name}"
+    }
+
+    /([A-Z]\w*(?:::[A-Z]\w*)*)([.#]|::)([a-zA-Z0-9_\[\]:]+[!?=]?)(?:[:](\d+))?/ match: method_identifier
+  }
+
+  alias_method('match_method, 'match_method:)
+}
+
+class Rubinius Location {
+  forwards_unary_ruby_methods
+}
+
+class Rubinius Debugger Frame {
+  forwards_unary_ruby_methods
+
+  def describe {
+    arg_str = ""
+    recv = nil
+    signature = method selectors_with_args
+
+    loc = @location
+
+    if: (loc is_block) then: {
+      if: (method required_args == 0) then: {
+        recv = "{ } in #{loc describe_receiver}#{loc name}"
+      } else: {
+        block_args = method local_names join: ", "
+        recv = "|#{block_args}| { } in #{loc describe_receiver}#{loc name}"
+      }
+    } else: {
+      if: (method required_args == 0) then: {
+        recv = loc describe
+      } else: {
+        recv = "#{loc describe}"
+      }
+    }
+
+    recv = recv replace: "#:" with: "#"
+    recv = recv replace: ".:" with: "##"
+    recv = recv replace: "." with: "##"
+
+    str = "#{recv} at #{loc method active_path}:#{loc line} (#{loc ip})"
+    { str << " (+#{loc ip})" } if: $ @debugger variables['show_ip]
+    str
+  }
+
+  alias_method('describe, ':describe)
+
+  def run: code {
+    Fancy eval: (code to_s) binding: binding
+  }
+
+  alias_method('run, 'run:)
+}
+
+Rubinius Debugger start