1 files changed, 145 insertions, 0 deletions
diff --git a/spec/mspec/tool/remove_old_guards.rb b/spec/mspec/tool/remove_old_guards.rb
new file mode 100755
index 0000000000..bc5612c78d
--- /dev/null
+++ b/spec/mspec/tool/remove_old_guards.rb
@@ -0,0 +1,145 @@
+#!/usr/bin/env ruby
+
+# Removes old version guards in ruby/spec.
+# Run it from the ruby/spec repository root.
+# The argument is the new minimum supported version.
+#
+#   cd spec
+#   ../mspec/tool/remove_old_guards.rb <ruby-version>
+#
+# where <ruby-version> is a version guard with which should be removed
+#
+# Example:
+#   tool/remove_old_guards.rb 3.1
+#
+# As a result guards like
+#   ruby_version_is "3.1" do
+#     # ...
+#   end
+#
+# will be removed.
+
+def dedent(line)
+  if line.start_with?("  ")
+    line[2..-1]
+  else
+    line
+  end
+end
+
+def each_spec_file(&block)
+  Dir["*/**/*.rb"].each(&block)
+end
+
+def each_file(&block)
+  Dir["**/*"].each { |path|
+    yield path if File.file?(path)
+  }
+end
+
+def remove_guards(guard, keep)
+  each_spec_file do |file|
+    contents = File.binread(file)
+    if contents =~ guard
+      puts file
+      lines = contents.lines.to_a
+      while first = lines.find_index { |line| line =~ guard }
+        comment = first
+        while comment > 0 and lines[comment-1] =~ /^(\s*)#/
+          comment -= 1
+        end
+        indent = lines[first][/^(\s*)/, 1].length
+        last = (first+1...lines.size).find { |i|
+          space = lines[i][/^(\s*)end$/, 1] and space.length == indent
+        }
+        raise file unless last
+        if keep
+          lines[comment..last] = lines[first+1..last-1].map { |l| dedent(l) }
+        else
+          if comment > 0 and lines[comment-1] == "\n"
+            comment -= 1
+          elsif lines[last+1] == "\n"
+            last += 1
+          end
+          lines[comment..last] = []
+        end
+      end
+      File.binwrite file, lines.join
+    end
+  end
+end
+
+def remove_empty_files
+  each_spec_file do |file|
+    unless file.include?("fixtures/")
+      lines = File.readlines(file)
+      if lines.all? { |line| line.chomp.empty? or line.start_with?('require', '#') }
+        puts "Removing empty file #{file}"
+        File.delete(file)
+      end
+    end
+  end
+end
+
+def remove_unused_shared_specs
+  shared_groups = {}
+  # Dir["**/shared/**/*.rb"].each do |shared|
+  each_spec_file do |shared|
+    next if File.basename(shared) == 'constants.rb'
+    contents = File.binread(shared)
+    found = false
+    contents.scan(/^\s*describe (:[\w_?]+), shared: true do$/) {
+      shared_groups[$1] = 0
+      found = true
+    }
+    if !found and shared.include?('shared/') and !shared.include?('fixtures/') and !shared.end_with?('/constants.rb')
+      puts "no shared describe in #{shared} ?"
+    end
+  end
+
+  each_spec_file do |file|
+    contents = File.binread(file)
+    contents.scan(/(?:it_behaves_like|it_should_behave_like) (:[\w_?]+)[,\s]/) do
+      puts $1 unless shared_groups.key?($1)
+      shared_groups[$1] += 1
+    end
+  end
+
+  shared_groups.each_pair do |group, value|
+    if value == 0
+      puts "Shared describe #{group} seems unused"
+    elsif value == 1
+      puts "Shared describe #{group} seems used only once" if $VERBOSE
+    end
+  end
+end
+
+def search(regexp)
+  each_file do |file|
+    contents = File.binread(file)
+    if contents =~ regexp
+      puts file
+      contents.each_line do |line|
+        if line =~ regexp
+          puts line
+        end
+      end
+    end
+  end
+end
+
+abort "usage: #{$0} <ruby-version>" if ARGV.empty?
+
+version = Regexp.escape(ARGV.fetch(0))
+version += "(?:\\.0)?" if version.count(".") < 2
+remove_guards(/ruby_version_is (["'])#{version}\1 do/, true)
+remove_guards(/ruby_version_is (["'])[0-9.]*\1 *... *(["'])#{version}\2 do/, false)
+remove_guards(/ruby_bug ["']#\d+["'], (["'])[0-9.]*\1 *... *(["'])#{version}\2 do/, true)
+
+remove_empty_files
+remove_unused_shared_specs
+
+puts "Search:"
+search(/(["'])#{version}\1/)
+search(/^\s*#.+#{version}/)
+search(/RUBY_VERSION_IS_#{version.tr('.', '_')}/)