use a better prefix for tempfiles (fixes #331)

lib/pry/helpers/command_helpers.rb

@@ -22,7 +22,7 @@ class Pry
       # Open a temp file and yield it to the block, closing it after
       # @return [String] The path of the temp file
       def temp_file
-        file = Tempfile.new(["tmp", ".rb"])
+        file = Tempfile.new(['pry', '.rb'])
         yield file
       ensure
         file.close

test/helper.rb

@@ -163,7 +163,7 @@ end
 # Open a temp file and yield it to the block, closing it after
 # @return [String] The path of the temp file
 def temp_file
-  file = Tempfile.new("tmp")
+  file = Tempfile.new('pry')
   yield file
 ensure
   file.close

test/test_default_commands/test_introspection.rb

@@ -48,7 +48,7 @@ describe "Pry::DefaultCommands::Introspection" do
         end
 
         it "should reload the file if it is a ruby file" do
-          tf = Tempfile.new(["tmp", ".rb"])
+          tf = Tempfile.new(["pry", ".rb"])
           path = tf.path
 
           mock_pry("edit #{path}", "$rand").should =~ /#{@rand}/
@@ -57,7 +57,7 @@ describe "Pry::DefaultCommands::Introspection" do
         end
 
         it "should not reload the file if it is not a ruby file" do
-          tf = Tempfile.new(["tmp", ".py"])
+          tf = Tempfile.new(["pry", ".py"])
           path = tf.path
 
           mock_pry("edit #{path}", "$rand").should.not =~ /#{@rand}/
@@ -66,7 +66,7 @@ describe "Pry::DefaultCommands::Introspection" do
         end
 
         it "should not reload a ruby file if -n is given" do
-          tf = Tempfile.new(["tmp", ".rb"])
+          tf = Tempfile.new(["pry", ".rb"])
           path = tf.path
 
           mock_pry("edit -n #{path}", "$rand").should.not =~ /#{@rand}/
@@ -75,7 +75,7 @@ describe "Pry::DefaultCommands::Introspection" do
         end
 
         it "should reload a non-ruby file if -r is given" do
-          tf = Tempfile.new(["tmp", ".pryrc"])
+          tf = Tempfile.new(["pry", ".pryrc"])
           path = tf.path
 
           mock_pry("edit -r #{path}", "$rand").should =~ /#{@rand}/
@@ -87,7 +87,7 @@ describe "Pry::DefaultCommands::Introspection" do
 
     describe "with --ex" do
       before do
-        @tf = Tempfile.new(["tmp", ".rb"])
+        @tf = Tempfile.new(["pry", ".rb"])
         @path = @tf.path
         @tf << "1\n2\nraise RuntimeError"
         @tf.flush
@@ -364,7 +364,7 @@ describe "Pry::DefaultCommands::Introspection" do
   describe "edit-method" do
     describe "on a method defined in a file" do
       before do
-        @tempfile = Tempfile.new(['tmp', '*.rb'])
+        @tempfile = Tempfile.new(['pry', '*.rb'])
         @tempfile.puts <<-EOS
           module A
             def a

test/test_default_commands/test_shell.rb

@@ -121,7 +121,7 @@ describe "Pry::DefaultCommands::Shell" do
       it 'each successive cat --ex should show the next level of backtrace, and going past the final level should return to the first' do
         temp_files = []
         3.times do |i|
-          temp_files << Tempfile.new(['tmp', '*.rb'])
+          temp_files << Tempfile.new(['pry', '*.rb'])
           temp_files.last << "bt number #{i}"
           temp_files.last.flush
         end

test/test_pry_history.rb

@@ -5,7 +5,7 @@ describe Pry do
 
   before do
     Pry.history.clear
-    @file = Tempfile.new(["tmp", ".pry_history"])
+    @file = Tempfile.new(["pry", ".pry_history"])
     @hist = @file.path
     File.open(@hist, 'w') {|f| f << "1\n2\n3\n" }
     @old_hist = Pry.config.history.file