version 0.8.0pre4, suppress output from command that dont have return

values. suppress output from all expressions that end in a ';'. Added
`gem-cd` command that chdir to the directory containing the gem files.

TODO

@@ -1,10 +1,10 @@
 
 FUTURE
 * allows pipes (|) for commands
-* `strip_leading_whitespace` freaks out when method has no
-   documentation; fix this
 
 0.8.0
+* add ; at end of line to suppress return value output
+* Remove message spam (before/after hooks)
 * stop commands returning a value and allow all statements to suppress
    values being returned by ending line in ';'
 * use `redo` in the r() method when encounter a command

lib/pry/command_processor.rb

@@ -2,6 +2,9 @@ require 'forwardable'
 
 class Pry
   class CommandProcessor
+    SYSTEM_COMMAND_DELIMITER = "."
+    SYSTEM_COMMAND_REGEX = /^#{Regexp.escape(SYSTEM_COMMAND_DELIMITER)}(.*)/
+
     extend Forwardable
     
     attr_reader :pry_instance
@@ -12,20 +15,22 @@ class Pry
 
     def_delegators :@pry_instance, :commands, :nesting, :output
     
-    # Run a system command (shell command).
-    # @param [String] val The shell command to execute.
-    # @return [Boolean] Whether
-    def system_command(val)
-      if val =~ /^\.(.*)/
-        execute_system_command($1)
-        val.clear
-      else
-        return false
-      end
-      true
+    def valid_command?(val)
+      system_command?(val) || pry_command?(val)
     end
 
-    def execute_system_command(cmd)
+    def system_command?(val)
+      !!(SYSTEM_COMMAND_REGEX =~ val)
+    end
+
+    def pry_command?(val)
+      !!command_matched(val).first
+    end
+    
+    def execute_system_command(val)
+      SYSTEM_COMMAND_REGEX  =~ val
+      cmd = $1
+      
       if cmd =~ /^cd\s+(.+)/i
         begin
           Dir.chdir(File.expand_path($1))
@@ -35,6 +40,8 @@ class Pry
       else
         system(cmd)
       end
+
+      val.clear
     end
     
     # Determine whether a Pry command was matched and return command data
@@ -63,7 +70,10 @@ class Pry
       def val.clear() replace("") end
       def eval_string.clear() replace("") end
 
-      return if system_command(val)
+      if system_command?(val)
+        execute_system_command(val)
+        return
+      end
 
       cmd_data, args_string = command_matched(val)
 

lib/pry/commands.rb

@@ -120,6 +120,13 @@ class Pry
     alias_command "quit-program", "exit-program", ""
     alias_command "!!!", "exit-program", ""
 
+    command "gem-cd", "Change working directory to specified gem's directory." do |gem_name|
+      require 'rubygems'
+      gem_spec = Gem.source_index.find_name(gem_name).first
+      next output.put("Gem `#{gem_name}` not found.") if !gem_spec
+      Dir.chdir(File.expand_path(gem_spec.full_gem_path))
+    end
+
     command "toggle-color", "Toggle syntax highlighting." do
       Pry.color = !Pry.color
       output.puts "Syntax highlighting #{Pry.color ? "on" : "off"}"

lib/pry/pry_instance.rb

@@ -141,7 +141,8 @@ class Pry
   #   Pry.new.rep(Object.new)
   def rep(target=TOPLEVEL_BINDING)
     target = Pry.binding_for(target)
-    print.call output, re(target)
+    result = re(target)
+    print.call output, result if !@suppress_output
   end
 
   # Perform a read-eval
@@ -185,13 +186,29 @@ class Pry
   #   Pry.new.r(Object.new)
   def r(target=TOPLEVEL_BINDING)
     target = Pry.binding_for(target)
+    @suppress_output = false
     eval_string = ""
 
     loop do
       val = retrieve_line(eval_string, target)
       process_line(val, eval_string, target)
-      break eval_string if valid_expression?(eval_string)
+      if valid_expression?(eval_string)
+        redo if null_input?(val)
+        break 
+      end
     end
+
+    @suppress_output = true if eval_string =~ /;\Z/
+    
+    eval_string
+  end
+
+  # Returns true if input is "" and a command is not returning a
+  # value.
+  # @param [String] val The input string.
+  # @return [Boolean] Whether the input is null.
+  def null_input?(val)
+    val.empty? && !Pry.cmd_ret_value
   end
 
   # Read a line of input and check for ^d, also determine prompt to use.
@@ -224,7 +241,7 @@ class Pry
     if Pry.cmd_ret_value
       eval_string << "Pry.cmd_ret_value\n"
     else
-      eval_string << "#{val}\n"
+      eval_string << "#{val}\n" if !val.empty?
     end
   end
 

lib/pry/version.rb

@@ -1,3 +1,3 @@
 class Pry
-  VERSION = "0.8.0pre3"
+  VERSION = "0.8.0pre4"
 end