Initial implementation.

README.rdoc

@@ -1,16 +1,79 @@
 = hammertime
 
-Description goes here.
-
-== Note on Patches/Pull Requests
-
-* Fork the project.
-* Make your feature addition or bug fix.
-* Add tests for it. This is important so I don't break it in a
-  future version unintentionally.
-* Commit, do not mess with rakefile, version, or history.
-  (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
-* Send me a pull request. Bonus points for topic branches.
+An interactive error console similar to those found in Lisp and Smalltalk environments.
+
+== Synopsis
+
+Simply require the Hammertime library:
+
+    require 'hammertime'
+
+    $broken = true
+
+    def faulty_method
+      raise "Oh no!" if $broken
+    end
+
+    3.times do |n|
+      puts "Attempt (#{n+1}/3)"
+      begin
+        faulty_method
+        puts "No error raised"
+      rescue => error
+        puts "Error raised: #{error.inspect}"
+      end
+    end
+
+When an error is raised, a menu of possible actions will be presented at the console:
+
+    === Stop! Hammertime. ===
+    An error has occurred at example.rb:4:in `raise_runtime_error'
+    The error is: #<RuntimeError: Oh no!>
+    1. Continue (process the exception normally)
+    2. Ignore (proceed without raising an exception)
+    3. Permit by type (don't ask about future errors of this type)
+    4. Permit by line (don't ask about future errors raised from this point)
+    5. Backtrace (show the call stack leading up to the error)
+    6. Debug (start a debugger)
+    7. Console (start an IRB session)
+    What now?
+
+This enables a fix-and-continue style of development:
+
+    $ ruby example.rb                                                
+    Attempt (1/3)
+
+    === Stop! Hammertime. ===
+    An error has occurred at example.rb:6:in `faulty_method'
+    The error is: #<RuntimeError: Oh no!>                   
+    1. Continue (process the exception normally)            
+    2. Ignore (proceed without raising an exception)        
+    3. Permit by type (don't ask about future errors of this type)
+    4. Permit by line (don't ask about future errors raised from this point)
+    5. Backtrace (show the call stack leading up to the error)              
+    6. Debug (start a debugger)                                             
+    7. Console (start an IRB session)                                       
+    What now?
+    7
+
+    >> $broken = false
+    => false
+    >> exit
+
+    1. Continue (process the exception normally)
+    2. Ignore (proceed without raising an exception)
+    3. Permit by type (don't ask about future errors of this type)
+    4. Permit by line (don't ask about future errors raised from this point)
+    5. Backtrace (show the call stack leading up to the error)
+    6. Debug (start a debugger)
+    7. Console (start an IRB session)
+    What now?
+    2
+    No error raised
+    Attempt (2/3)
+    No error raised
+    Attempt (3/3)
+    No error raised
 
 == Copyright
 

example.rb

@@ -0,0 +1,17 @@
+require 'lib/hammertime'
+
+$broken = true
+
+def faulty_method
+  raise "Oh no!" if $broken
+end
+
+3.times do |n|
+  puts "Attempt (#{n+1}/3)"
+  begin
+    faulty_method
+    puts "No error raised"
+  rescue => error
+    puts "Error raised: #{error.inspect}"
+  end
+end

lib/hammertime.rb

@@ -0,0 +1,128 @@
+require 'highline'
+require 'ruby-debug'
+
+module Hammertime
+  def self.ignored_errors
+    @ignored_errors ||= [LoadError]
+  end
+
+  def self.ignored_lines
+    @ignored_lines ||= []
+  end
+
+  def self.stopped
+    @stopped ||= false
+  end
+
+  def self.stopped=(value)
+    @stopped = value
+  end
+
+  def hammertime_raise(*args)
+    backtrace = caller(2)
+    Thread.exclusive do
+      error, backtrace = 
+        case args.size
+        when 0 then [($!.nil? ? RuntimeError.new : $!), backtrace]
+        when 1 then 
+          if args[0].is_a?(String) 
+            [RuntimeError.exception(args[0]), backtrace]
+          else
+            [args[0].exception, backtrace]
+          end
+        when 2 then
+          [args[0].exception(args[1]), backtrace]
+        when 3 then
+          [args[0].exception(args[1]), args[2]]
+        else
+          super(ArgumentError, "wrong number of arguments", backtrace)
+        end
+      error.set_backtrace(backtrace)
+
+      if hammertime_ignore_error?(error, backtrace)
+        hammertime_original_raise(error)
+      else
+        ::Hammertime.stopped = true
+      end
+
+      c = ::Hammertime.hammertime_console
+      c.say "\n"
+      c.say "=== Stop! Hammertime. ==="
+      c.say "An error has occurred at #{backtrace.first}"
+      c.say "The error is: #{error.inspect}"
+      menu_config = lambda do |menu|
+        menu.prompt    = "What now?"
+        menu.default   = "Continue"
+        menu.select_by = :index_or_name
+
+        menu.choice "Continue (process the exception normally)" do
+          hammertime_original_raise(error)
+          true
+        end
+        menu.choice "Ignore (proceed without raising an exception)" do
+          true
+        end
+        menu.choice "Permit by type (don't ask about future errors of this type)" do
+          ::Hammertime.ignored_errors << error.class
+          c.say "Added #{error.class} to permitted error types"
+          hammertime_original_raise(error)
+          true
+        end
+        menu.choice "Permit by line (don't ask about future errors raised from this point)" do
+          ::Hammertime.ignored_lines << backtrace.first
+          c.say "Added #{backtrace.first} to permitted error lines"
+          hammertime_original_raise(error)
+          true
+        end
+        menu.choice "Backtrace (show the call stack leading up to the error)" do
+          backtrace.each do |frame| c.say frame end
+          false
+        end
+        menu.choice "Debug (start a debugger)" do
+          debugger
+          false
+        end
+        menu.choice "Console (start an IRB session)" do
+          require 'irb'
+          IRB.start
+          false
+        end
+      end
+      continue = c.choose(&menu_config) until continue
+    end
+  ensure
+    ::Hammertime.stopped = false
+  end
+
+  def hammertime_original_raise(*args)
+    Kernel.instance_method(:raise).bind(self).call(*args)
+  end
+
+  def fail(*args)
+    hammertime_raise(*args)
+  end
+
+  def raise(*args)
+    hammertime_raise(*args)
+  end
+
+  private
+
+  def self.hammertime_console
+    @console ||= HighLine.new($stdin, $stderr)
+  end
+
+  def hammertime_ignore_error?(error, backtrace)
+    return true if ::Hammertime.stopped
+    return true if ::Hammertime.ignored_errors.any?{|e| error.is_a?(e)}
+    return true if ::Hammertime.ignored_lines.include?(backtrace.first)
+    return false
+  end
+end
+
+unless ::Object < Hammertime
+  class ::Object
+    include ::Hammertime
+  end
+  Debugger.start
+end