Added show_source_list and show_call_stack to breakpoints to make it easier to get context (closes #5476) [takiuchi@drecom.co.jp]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4545 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/CHANGELOG

@@ -1,5 +1,24 @@
 *SVN*
 
+* Added show_source_list and show_call_stack to breakpoints to make it easier to get context #5476 [takiuchi@drecom.co.jp]. Examples:
+
+    irb(#<TopController:0x40822a68>):002:0> show_source_list
+    0001  class TopController < ApplicationController
+    0002    def show
+    0003->    breakpoint
+    0004    end
+    0005    
+    0006    def index
+    0007    end
+    0008    
+    => "/path/to/rails/root/app/controllers/top_controller.rb"
+
+    irb(#<TopController:0x40822a68>):004:0> show_call_stack 3
+    vendor/rails/railties/lib/breakpoint.rb:536:in `breakpoint'
+    vendor/rails/railties/lib/breakpoint.rb:536:in `breakpoint'
+    app/controllers/top_controller.rb:3:in `show'
+    => "/path/to/rails/root/app/controllers/top_controller.rb:3"
+
 * Generate scaffold layout in subdirectory appropriate to its module nesting. #5511 [nils@alumni.rice.edu]
 
 * Mongrel: script/server tails the rails log like it does with lighttpd. Prefer mongrel over lighttpd. #5541 [mike@clarkware.com]

railties/lib/breakpoint.rb

@@ -178,6 +178,30 @@ module Breakpoint
       end
     end
 
+    # Prints the source code surrounding the location where the
+    # breakpoint was issued.
+    def show_source_list(context = 5)
+      start_line, break_line, result = source_lines(context, true)
+      offset = [(break_line + context).to_s.length, 4].max
+      result.each_with_index do |line, i|
+        mark = (start_line + i == break_line ? '->' : '  ')
+        client.puts("%0#{offset}d%s#{line}" % [start_line + i, mark])
+      end
+      Pathname.new(@__bp_file).cleanpath.to_s
+    end
+
+    # Prints the call stack.
+    def show_call_stack(depth = 10)
+      base = Pathname.new(RAILS_ROOT).cleanpath.to_s
+      caller[1..depth].each do |line|
+        line.sub!(/^[^:]*/) do |path|
+          Pathname.new(path).cleanpath.to_s
+        end
+        client.puts(line.index(base) == 0 ? line[(base.length + 1)..-1] : line)
+      end
+      "#{Pathname.new(@__bp_file).cleanpath.to_s}:#{@__bp_line}"
+    end
+
     # Lets an object that will forward method calls to the breakpoint
     # client. This is useful for outputting longer things at the client
     # and so on. You can for example do these things: