Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/9109#discussion_r42838196
--- Diff: docs/_plugins/include_example.rb ---
@@ -0,0 +1,79 @@
+require 'liquid'
+require 'pygments'
+
+module Jekyll
+ class IncludeExampleTag < Liquid::Tag
+
+ def initialize(tag_name, markup, tokens)
+ @markup = markup
+ super
+ end
+
+ def render(context)
+ site = context.registers[:site]
+ config_dir = (site.config['code_dir'] ||
'../examples/src/main').sub(/^\//,'')
+ @code_dir = File.join(site.source, config_dir)
+
+ clean_markup = @markup.strip
+ @file = File.join(@code_dir, clean_markup)
+ @lang = clean_markup.split('.').last
+
+ code = File.open(@file).read.encode("UTF-8")
+ code = select_lines(code)
+
+ Pygments.highlight(code, :lexer => @lang)
+ end
+
+ # Trim the code block so as to have the same indention, regardless of
their positions in the
+ # code file.
+ def trim_codeblock(lines)
+ # Select the minimum indention of the current code block.
+ min_start_spaces = lines
+ .select{ |l| l.strip.size !=0 }
--- End diff --
nit: if we still want to follow Spark code style, it should be `select {`
instead of `select{`
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