added 'hide_x_bottom_lines' and 'sort_alphabetically' options

README.md

@@ -39,6 +39,23 @@ end
 
 ```
 
+You can also pass some options:
+
+```ruby
+
+# will hide bottom x lines of the graph
+Flamegraph.generate(filename, hide_x_bottom_lines: 20) do
+  # your work here
+end
+
+# will order stacktraces alphabetically, like the original Flamegraph (https://github.com/brendangregg/FlameGraph) does
+Flamegraph.generate(filename, sort_alphabetically: true) do # TODO: consider https://gist.github.com/BrVer/9854d6fb5b9546987c49e0dcf8ead380 instead
+  # your work here
+end
+
+```
+
+
 ## Demo
 
 Demo of: https://github.com/SamSaffron/flamegraph/blob/master/demo/demo.rb

lib/flamegraph.rb

@@ -44,6 +44,12 @@ def self.generate(filename=nil, opts = {})
           yield
         end
       end
+    if opts[:hide_x_bottom_lines]
+      backtraces.map! { |b| b[0..-(opts[:hide_x_bottom_lines].to_i + 1)] }.reject(&:empty?)
+    end
+    if opts[:sort_alphabetically]
+      backtraces.sort_by! {|b| b.reverse.join('---')}
+    end
 
     embed_resources = (filename && !opts.key?(:embed_resources)) || opts[:embed_resources]