1 files changed, 18 insertions, 0 deletions
diff --git a/lib/rake/backtrace.rb b/lib/rake/backtrace.rb
new file mode 100644
index 0000000000..038ca57906
--- /dev/null
+++ b/lib/rake/backtrace.rb
@@ -0,0 +1,18 @@
+module Rake
+  module Backtrace
+    SUPPRESSED_PATHS =
+      RbConfig::CONFIG.values_at(*RbConfig::CONFIG.
+                                 keys.grep(/(prefix|libdir)/)) + [
+        File.join(File.dirname(__FILE__), ".."),
+      ].map { |f| Regexp.quote(File.expand_path(f)) }
+    SUPPRESSED_PATHS.reject! { |s| s.nil? || s =~ /^ *$/ }
+
+    SUPPRESS_PATTERN = %r!(\A#{SUPPRESSED_PATHS.join('|')}|bin/rake:\d+)!i
+
+    def self.collapse(backtrace)
+      pattern = Rake.application.options.suppress_backtrace_pattern ||
+                SUPPRESS_PATTERN
+      backtrace.reject { |elem| elem =~ pattern }
+    end
+  end
+end