Initial refactoring from teapot.

.gitignore

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+*.gem
+*.rbc
+.bundle
+.config
+.yardoc
+Gemfile.lock
+InstalledFiles
+_yardoc
+coverage
+doc/
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp
+*.bundle
+*.so
+*.o
+*.a
+mkmf.log
+.rspec_status

.rspec

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+--format documentation
+--backtrace
+--warnings
+--require spec_helper

.travis.yml

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+language: ruby
+sudo: false
+dist: trusty
+cache: bundler
+rvm:
+  - 2.1
+  - 2.2
+  - 2.3
+  - 2.4
+  - ruby-head
+  - jruby-head
+matrix:
+  allow_failures:
+    - rvm: "ruby-head"
+    - rvm: "jruby-head"
+addons:
+  apt:
+    packages:
+      - graphviz

Gemfile

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+source 'https://rubygems.org'
+
+gemspec
+
+group :development do
+	gem 'guard'
+	gem 'guard-rspec'
+end
+
+group :test do
+	gem 'simplecov'
+	gem 'coveralls', require: false
+end

Guardfile

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+
+directories %w(lib spec)
+clearing :on
+
+guard :rspec, cmd: "bundle exec rspec" do
+	watch(%r{^spec/.+_spec\.rb$})
+	watch(%r{^lib/(.+)\.rb$}) { |m| "spec/#{m[1]}_spec.rb" }
+	watch("spec/spec_helper.rb") { "spec" }
+end

README.md

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+# Build::Text
+
+`Build::Text` provides substitutions and merging for textual files, typically code.
+
+[![Build Status](https://secure.travis-ci.org/ioquatix/build-text.svg)](http://travis-ci.org/ioquatix/build-text)
+[![Code Climate](https://codeclimate.com/github/ioquatix/build-text.svg)](https://codeclimate.com/github/ioquatix/build-text)
+[![Coverage Status](https://coveralls.io/repos/ioquatix/build-text/badge.svg)](https://coveralls.io/r/ioquatix/build-text)
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+	gem 'build-text'
+
+And then execute:
+
+	$ bundle
+
+Or install it yourself as:
+
+	$ gem install build-text
+
+## Usage
+
+### Substitutions
+
+Provides a very simple template language for doing text substitutions:
+
+```ruby
+require 'build/text'
+
+substitutions = Build::Text::Substitutions.new
+substitutions['ANIMAL'] = 'cat'
+substitutions['SOUND'] = 'meow'
+
+puts substitutions.apply("The $ANIMAL says $SOUND.")
+# Prints "The cat says meow."
+```
+
+It can also do indented expressions.
+
+```ruby
+require 'build/text'
+
+substitutions = Build::Text::Substitutions.new
+substitutions['MODULE'] = ["module Meow\n", "end\n"]
+
+puts substitutions.apply("<MODULE>\ndef function\nend\n</MODULE>")
+# Prints:
+# module Meow
+# 	def function
+# 	end
+# end
+```
+
+### Merging
+
+A best effort merging strategy to combine two files. It uses LCS to match up sections, and then appends segments together.
+
+Given the following input file:
+
+```c++
+class Bob {
+	int alice();
+}
+```
+
+and the following template:
+
+```c++
+class Bob {
+int bob();
+}
+```
+
+it can be merged
+
+```ruby
+merged = Build::Text::Merge.combine(input.lines, template.lines)
+```
+
+and the merged result will be:
+
+```c++
+class Bob {
+	int alice();
+	int bob();
+}
+```
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request
+
+## License
+
+Released under the MIT license.
+
+Copyright, 2017, by [Samuel G. D. Williams](http://www.codeotaku.com/samuel-williams).
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

Rakefile

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+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
+
+RSpec::Core::RakeTask.new(:spec) do |task|
+	task.rspec_opts = ["--require", "simplecov"] if ENV['COVERAGE']
+end
+
+task :default => :spec

build-text.gemspec

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+# coding: utf-8
+require_relative 'lib/build/text/version'
+
+Gem::Specification.new do |spec|
+	spec.name          = "build-text"
+	spec.version       = Build::Text::VERSION
+	spec.authors       = ["Samuel Williams"]
+	spec.email         = ["samuel.williams@oriontransfer.co.nz"]
+	spec.summary       = %q{Text substitutions and merging.}
+	spec.homepage      = ""
+	spec.license       = "MIT"
+
+	spec.files         = `git ls-files -z`.split("\x0")
+	spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
+	spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
+	spec.require_paths = ["lib"]
+
+	spec.add_development_dependency "bundler", "~> 1.3"
+	spec.add_development_dependency "rspec", "~> 3.6"
+	spec.add_development_dependency "rake"
+end

lib/build/text.rb

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+# Copyright, 2017, by Samuel G. D. Williams. <http://www.codeotaku.com>
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+require_relative 'text/version'
+
+require_relative 'text/merge'
+require_relative 'text/substitutions'

lib/build/text/indentation.rb

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+# Copyright, 2013, by Samuel G. D. Williams. <http://www.codeotaku.com>
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+module Build
+	module Text
+		class Indentation
+			TAB = "\t".freeze
+
+			def initialize(prefix, level, indent)
+				@prefix = prefix
+				@level = level
+				@indent = indent
+			end
+
+			def freeze
+				indentation
+
+				@prefix.freeze
+				@level.freeze
+				@indent.freeze
+
+				super
+			end
+
+			def indentation
+				@indentation ||= @prefix + (@indent * @level)
+			end
+
+			def + other
+				indentation + other
+			end
+
+			def << text
+				text.gsub(/^/){|m| m + indentation}
+			end
+
+			def by(depth)
+				Indentation.new(@prefix, @level + depth, @indent)
+			end
+
+			def with_prefix(prefix)
+				Indentation.new(prefix, @level, @indent)
+			end
+
+			def self.none
+				self.new('', 0, TAB)
+			end
+		end
+	end
+end