Embed opentracing 0.4.3

This commit is contained in:
Sruthi Chandran 2019-03-14 13:13:30 +05:30
parent f7791ef5ea
commit e027f55b03
21 changed files with 976 additions and 0 deletions

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---
engines:
duplication:
enabled: true
config:
languages:
- ruby
fixme:
enabled: true
rubocop:
enabled: true
ratings:
paths:
- "**.rb"
exclude_paths:
- test/

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*.gem
*.rbc
/.config
/coverage/
/InstalledFiles
/pkg/
/spec/reports/
/spec/examples.txt
/test/tmp/
/test/version_tmp/
/tmp/
# Used by dotenv library to load environment variables.
# .env
## Specific to RubyMotion:
.dat*
.repl_history
build/
*.bridgesupport
build-iPhoneOS/
build-iPhoneSimulator/
## Specific to RubyMotion (use of CocoaPods):
#
# We recommend against adding the Pods directory to your .gitignore. However
# you should judge for yourself, the pros and cons are mentioned at:
# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
#
# vendor/Pods/
## Documentation cache and generated files:
/.yardoc/
/_yardoc/
/doc/
/rdoc/
## Environment normalization:
/.bundle/
/vendor/bundle
/lib/bundler/man/
# for a library or gem, you might want to ignore these files since the code is
# intended to run in multiple environments; otherwise, check them in:
Gemfile.lock
# .ruby-version
# .ruby-gemset
# unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
.rvmrc

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Lint/UnusedMethodArgument:
Enabled: no
Metrics/LineLength:
Max: 120
Metrics/ParameterLists:
Enabled: no

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sudo: false
language: ruby
rvm:
- 2.3.4
- 2.4.1
- jruby-9.1.8.0
before_install: gem install bundler -v 1.13.6
script: JRUBY_OPTS="--debug" bundle exec rake

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# Changelog
## 0.4.3
* Specify versions for development dependencies ([#40](https://github.com/opentracing/opentracing-ruby/pull/40))
## 0.4.2
* Update opentracing.io links and scheme on README ([#38](https://github.com/opentracing/opentracing-ruby/pull/38))
* Add active_span method to Tracer ([#34](https://github.com/opentracing/opentracing-ruby/pull/34))
## 0.4.1
* Add active_span convenience method to OpenTracing module ([#30](https://github.com/opentracing/opentracing-ruby/pull/30))
* Fix global tracer delegators ([#28](https://github.com/opentracing/opentracing-ruby/pull/28))
* Add Rubocop ([#29](https://github.com/opentracing/opentracing-ruby/pull/27))
* Update license from MIT => Apache 2.0 ([#26](https://github.com/opentracing/opentracing-ruby/pull/26))
## 0.4.0
* The tracer now implements the OpenTracing Scope API for in-process scope propagation([#21](https://github.com/opentracing/opentracing-ruby/pull/21))
* Adds a `log_kv` method and deprecates `log` for consistency with other language implementations. See [#22](https://github.com/opentracing/opentracing-ruby/pull/23).
## 0.3.2
* Addressing Ruby style issues ([#14](https://github.com/opentracing/opentracing-ruby/pull/14))
* Default to the no-op tracer ([#17](https://github.com/opentracing/opentracing-ruby/pull/17))
* Fixing serialization example in README ([#18](https://github.com/opentracing/opentracing-ruby/pull/18))
* Removing bundler development version requirement

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source 'https://rubygems.org'
# Specify your gem's dependencies in opentracing.gemspec
gemspec

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# OpenTracing API for Ruby
[![Build Status](https://travis-ci.org/ngauthier/opentracing-ruby.svg?branch=master)](https://travis-ci.org/ngauthier/opentracing-ruby) [![Code Climate](https://codeclimate.com/github/ngauthier/opentracing-ruby/badges/gpa.svg)](https://codeclimate.com/github/ngauthier/opentracing-ruby) [![Test Coverage](https://codeclimate.com/github/ngauthier/opentracing-ruby/badges/coverage.svg)](https://codeclimate.com/github/ngauthier/opentracing-ruby/coverage)
This package is a Ruby platform API for OpenTracing.
## Required Reading
In order to understand the Ruby platform API, one must first be familiar with the
[OpenTracing project](https://opentracing.io) and
[terminology](https://opentracing.io/docs/overview/) more specifically.
## Installation
Add this line to your application's Gemfile:
```ruby
gem 'opentracing'
```
And then execute:
$ bundle
Or install it yourself as:
$ gem install opentracing
`opentracing` supports Ruby 2.0+.
## Usage
Everyday consumers of this `opentracing` gem really only need to worry
about a couple of key abstractions: the `start_active_span` and `start_span`
methods, the `Span` and `ScopeManager` interfaces, and binding a `Tracer`
at runtime. Here are code snippets demonstrating some important use cases.
### Singleton initialization
As early as possible, call
```ruby
require 'opentracing'
OpenTracing.global_tracer = MyTracerImplementation.new(...)
```
Where `MyTracerImplementation` is your tracer. For testing, you can use
the provided `OpenTracing::Tracer`
### Non-Singleton initialization
If you prefer direct control to singletons, manage ownership of the
`Tracer` implementation explicitly.
### Scopes and within-process propagation
For any thread, at most one `Span` may be "active". Of course there may be many
other `Spans` involved with the thread which are (a) started, (b) not finished,
and yet (c) not "active": perhaps they are waiting for I/O, blocked on a child
`Span`, or otherwise off of the critical path.
It's inconvenient to pass an active `Span` from function to function manually,
so OpenTracing requires that every `Tracer` contains a `ScopeManager` that
grants access to the active `Span` through a `Scope`. Any `Span` may be
transferred to another callback or thread, but not `Scope`.
#### Accessing the active Span through Scope
```ruby
# Access to the active span is straightforward.
span = OpenTracing.active_span
if span
span.set_tag('...', '...')
end
# or
scope = OpenTracing.scope_manager.active
if scope
scope.span.set_tag('...', '...')
end
```
### Starting a new Span
The common case starts a `Scope` that's automatically registered for
intra-process propagation via `ScopeManager`.
Note that `start_active_span('...')` automatically finishes the span on
`Scope#close` (`start_active_span('...', finish_on_close: false)` does not
finish it, in contrast).
```ruby
# Automatic activation of the Span.
# By default the active span will be finished when the returned scope is closed.
# This can be controlled by passing finish_on_close parameter to
# start_active_span
scope = OpenTracing.start_active_span('operation_name')
# Do things.
# Block form of start_active_span
# start_active_span optionally accepts a block. If a block is passed to
# start_active_span it will yield the newly created scope. The scope will
# be closed and its associated span will be finished unless
# finish_on_close: false is passed to start_active_span.
OpenTracing.start_active_span('operation_name') do |scope|
# Do things.
end
# Manual activation of the Span.
# Spans can be managed manually. This is equivalent to the more concise examples
# above.
span = OpenTracing.start_span('operation_name')
OpenTracing.scope_manager.activate(span)
scope = OpenTracing.scope_manager.active
# Do things.
# If there is an active Scope, it will act as the parent to any newly started
# Span unless ignore_active_scope: true is passed to start_span or
# start_active_span.
# create a root span, ignoring the currently active scope (if it's set)
scope = OpenTracing.start_active_span('operation_name', ignore_active_scope: true)
# or
span = OpenTracing.start_span('operation_name', ignore_active_scope: true)
# It's possible to create a child Span given an existing parent Span by
# using the child_of option.
parent_scope = OpenTracing.start_active_span('parent_operation, ignore_active_scope: true)
child_scope = OpenTracing.start_active_span('child_operation', child_of: parent_scope.span)
# or
parent_span = OpenTracing.start_span('parent_operation', ignore_active_scope: true)
child_span = OpenTracing.start_span('child_operation', child_of: parent_span)
```
### Serializing to the wire
Using `Net::HTTP`:
```ruby
client = Net::HTTP.new("myservice.com")
req = Net::HTTP::Post.new("/")
span = OpenTracing.start_span("my_span")
OpenTracing.inject(span.context, OpenTracing::FORMAT_RACK, req)
res = client.request(req)
#...
```
Using Faraday middleware:
```ruby
class TraceMiddleware < Faraday::Middleware
def call(env)
span = OpenTracing.start_span("my_span")
OpenTracing.inject(span.context, OpenTracing::FORMAT_RACK, env)
@app.call(env).on_complete do
span.finish
end
end
end
```
### Deserializing from the wire
The OpenTracing Ruby gem provides a specific Rack header extraction format,
since most Ruby web servers get their HTTP Headers from Rack. Keep in mind that
Rack automatically uppercases all headers and replaces dashes with underscores.
This means that if you use dashes and underscores and case-sensitive baggage,
it will not be possible to discern once Rack has processed it.
```ruby
class MyRackApp
def call(env)
extracted_ctx = @tracer.extract(OpenTracing::FORMAT_RACK, env)
span = @tracer.start_span("my_app", child_of: extracted_ctx)
span.finish
[200, {}, ["hello"]]
end
end
```
## Development
After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
## Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/opentracing/opentracing-ruby. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
## Licensing
[Apache 2.0 License](./LICENSE).

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require 'bundler/gem_tasks'
require 'rake/testtask'
require 'rubocop/rake_task'
Rake::TestTask.new(:test) do |t|
t.libs << 'test'
t.libs << 'lib'
t.test_files = FileList['test/**/*_test.rb']
end
RuboCop::RakeTask.new(:rubocop)
if RUBY_PLATFORM == 'java'
task default: :test
else
task default: %i[rubocop test]
end

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#!/usr/bin/env ruby
require 'bundler/setup'
require 'opentracing'
require 'irb'
IRB.start

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#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'
set -vx
bundle install

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require 'forwardable'
require 'opentracing/version'
require 'opentracing/span_context'
require 'opentracing/span'
require 'opentracing/reference'
require 'opentracing/tracer'
require 'opentracing/scope'
require 'opentracing/scope_manager'
#:nodoc:
module OpenTracing
# Text format for Tracer#inject and Tracer#extract.
#
# The carrier for FORMAT_TEXT_MAP should be a Hash with string values.
FORMAT_TEXT_MAP = 1
# Binary format for #inject and #extract
#
# The carrier for FORMAT_BINARY should be a string, treated as a raw sequence
# of bytes.
FORMAT_BINARY = 2
# Due to Rack's popularity within the Ruby community, OpenTracing-Ruby
# provides a Rack-specific format for injection into and extraction from HTTP
# headers specifically, though there are some strings attached.
#
# The carrier for FORMAT_RACK should be `env` or equivalent. It behaves like
# FORMAT_TEXT_MAP, but with all keys transformed per Rack's treatment of HTTP
# headers. Keep in mind that Rack automatically uppercases all headers and
# replaces dashes with underscores. This means that if you use dashes and
# underscores and case-sensitive baggage keys, they may collide or become
# unrecognizable.
FORMAT_RACK = 3
class << self
extend Forwardable
# Global tracer to be used when OpenTracing.start_span, inject or extract is called
attr_accessor :global_tracer
def_delegators :global_tracer, :scope_manager, :start_active_span,
:start_span, :inject, :extract, :active_span
end
end
# Default to the no-op tracer
OpenTracing.global_tracer = OpenTracing::Tracer.new

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module OpenTracing
# Carriers are used for inject and extract operations. A carrier should be a
# Hash or hash-like object. At a minimum, it should implement `[]`, `[]=`, and
# `each` shown here.
class Carrier
# [] retrieves a value by the given key
# @param key [String] key to retrieve the value
# @return [String] the desired value
def [](key); end
# []= sets the value for the given key
# @param key [String] key to set
# @param value [String] value to set
def []=(key, value); end
# each iterates over every key-value pair in the carrier
# @yield [key, value]
# @yieldparam key [String] the key of the tuple
# @yieldparam value [String] the value of the tuple
def each(&block); end
end
end

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module OpenTracing
#:nodoc:
class Reference
CHILD_OF = 'child_of'.freeze
FOLLOWS_FROM = 'follows_from'.freeze
# @param context [SpanContext, Span] child_of context refers to a
# parent Span that caused *and* somehow depends upon the new child Span.
# Often (but not always), the parent Span cannot finish until the child
# Span does.
#
# An timing diagram for a child Span that is blocked on the new Span:
#
# [-Parent Span----------]
# [-Child Span----]
#
# See http://opentracing.io/documentation/pages/spec
#
# @return [Reference] a ChildOf reference
#
# @example
# root_span = OpenTracing.start_span('root operation')
# child_span = OpenTracing.start_span('child operation', references: [
# OpenTracing::Reference.child_of(root_span)
# ])
#
def self.child_of(context)
context = context.context if context.is_a?(Span)
Reference.new(CHILD_OF, context)
end
# @param context [SpanContext, Span] follows_from context refers to a
# parent Span that does not depend in any way on the result of the new
# child Span. For instance, one might use FollowsFrom Span to describe
# pipeline stages separated by queues, or a fire-and-forget cache insert
# at the tail end of a web request.
#
# A FollowsFrom Span is part of the same logical trace as the new Span:
# i.e., the new Span is somehow caused by the work of its FollowsFrom
# Span.
#
# All of the following could be valid timing diagrams for children that
# "FollowFrom" a parent:
#
# [-Parent Span--] [-Child Span-]
#
# [-Parent Span--]
# [-Child Span-]
#
# [-Parent Span-]
# [-Child Span-]
#
# See http://opentracing.io/documentation/pages/spec
#
# @return [Reference] a FollowsFrom reference
#
# @example
# context = OpenTracing.extract(OpenTracing::FORMAT_RACK, rack_env)
# span = OpenTracing.start_span('following operation', references: [
# OpenTracing::Reference.follows_from(context)
# ])
#
def self.follows_from(context)
context = context.context if context.is_a?(Span)
Reference.new(FOLLOWS_FROM, context)
end
def initialize(type, context)
@type = type
@context = context
end
# @return [String] reference type
attr_reader :type
# @return [SpanContext] the context of a span this reference is referencing
attr_reader :context
end
end

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module OpenTracing
# Scope represents an OpenTracing Scope
#
# See http://www.opentracing.io for more information.
class Scope
NOOP_INSTANCE = Scope.new.freeze
# Return the Span scoped by this Scope
#
# @return [Span]
def span
Span::NOOP_INSTANCE
end
# Mark the end of the active period for the current thread and Scope,
# updating the ScopeManager#active in the process.
#
# NOTE: Calling close more than once on a single Scope instance leads to
# undefined behavior.
def close; end
end
end

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module OpenTracing
# ScopeManager represents an OpenTracing ScopeManager
#
# See http://www.opentracing.io for more information.
#
# The ScopeManager interface abstracts both the activation of Span instances
# via ScopeManager#activate and access to an active Span/Scope via
# ScopeManager#active
#
class ScopeManager
NOOP_INSTANCE = ScopeManager.new.freeze
# Make a span instance active.
#
# @param span [Span] the Span that should become active
# @param finish_on_close [Boolean] whether the Span should automatically be
# finished when Scope#close is called
# @return [Scope] instance to control the end of the active period for the
# Span. It is a programming error to neglect to call Scope#close on the
# returned instance.
def activate(span, finish_on_close: true)
Scope::NOOP_INSTANCE
end
# @return [Scope] the currently active Scope which can be used to access the
# currently active Span.
#
# If there is a non-null Scope, its wrapped Span becomes an implicit parent
# (as Reference#CHILD_OF) of any newly-created Span at Tracer#start_active_span
# or Tracer#start_span time.
def active
Scope::NOOP_INSTANCE
end
end
end

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module OpenTracing
# Span represents an OpenTracing Span
#
# See http://www.opentracing.io for more information.
class Span
NOOP_INSTANCE = Span.new.freeze
# Set the name of the operation
#
# @param [String] name
def operation_name=(name); end
# Span Context
#
# @return [SpanContext]
def context
SpanContext::NOOP_INSTANCE
end
# Set a tag value on this span
# @param key [String] the key of the tag
# @param value [String, Numeric, Boolean] the value of the tag. If it's not
# a String, Numeric, or Boolean it will be encoded with to_s
def set_tag(key, value)
self
end
# Set a baggage item on the span
# @param key [String] the key of the baggage item
# @param value [String] the value of the baggage item
def set_baggage_item(key, value)
self
end
# Get a baggage item
# @param key [String] the key of the baggage item
# @return [String] value of the baggage item
def get_baggage_item(key)
nil
end
# @deprecated Use {#log_kv} instead.
# Reason: event is an optional standard log field defined in spec and not required. Also,
# method name {#log_kv} is more consistent with other language implementations such as Python and Go.
#
# Add a log entry to this span
# @param event [String] event name for the log
# @param timestamp [Time] time of the log
# @param fields [Hash] Additional information to log
def log(event: nil, timestamp: Time.now, **fields)
warn 'Span#log is deprecated. Please use Span#log_kv instead.'
nil
end
# Add a log entry to this span
# @param timestamp [Time] time of the log
# @param fields [Hash] Additional information to log
def log_kv(timestamp: Time.now, **fields)
nil
end
# Finish the {Span}
# @param end_time [Time] custom end time, if not now
def finish(end_time: Time.now)
nil
end
end
end

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module OpenTracing
# SpanContext holds the data for a span that gets inherited to child spans
class SpanContext
NOOP_INSTANCE = SpanContext.new.freeze
attr_reader :baggage
# Create a new SpanContext
# @param id the ID of the Context
# @param trace_id the ID of the current trace
# @param baggage baggage
def initialize(baggage: {}); end
end
end

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module OpenTracing
# Tracer is the entry point API between instrumentation code and the tracing
# implementation.
#
# This implementation both defines the public Tracer API, and provides a
# default no-op behavior.
#
class Tracer
# @return [ScopeManager] the current ScopeManager, which may be a no-op but
# may not be nil.
def scope_manager
ScopeManager::NOOP_INSTANCE
end
# @return [Span, nil] the active span. This is a shorthand for
# `scope_manager.active.span`, and nil will be returned if
# Scope#active is nil.
def active_span
scope = scope_manager.active
scope.span if scope
end
# Returns a newly started and activated Scope.
#
# If the Tracer's ScopeManager#active is not nil, no explicit references
# are provided, and `ignore_active_scope` is false, then an inferred
# References#CHILD_OF reference is created to the ScopeManager#active's
# SpanContext when start_active is invoked.
#
# @param operation_name [String] The operation name for the Span
# @param child_of [SpanContext, Span] SpanContext that acts as a parent to
# the newly-started Span. If a Span instance is provided, its
# context is automatically substituted. See [Reference] for more
# information.
#
# If specified, the `references` parameter must be omitted.
# @param references [Array<Reference>] An array of reference
# objects that identify one or more parent SpanContexts.
# @param start_time [Time] When the Span started, if not now
# @param tags [Hash] Tags to assign to the Span at start time
# @param ignore_active_scope [Boolean] whether to create an implicit
# References#CHILD_OF reference to the ScopeManager#active.
# @param finish_on_close [Boolean] whether span should automatically be
# finished when Scope#close is called
# @yield [Scope] If an optional block is passed to start_active it will
# yield the newly-started Scope. If `finish_on_close` is true then the
# Span will be finished automatically after the block is executed.
# @return [Scope] The newly-started and activated Scope
def start_active_span(operation_name,
child_of: nil,
references: nil,
start_time: Time.now,
tags: nil,
ignore_active_scope: false,
finish_on_close: true)
Scope::NOOP_INSTANCE.tap do |scope|
yield scope if block_given?
end
end
# Like #start_active_span, but the returned Span has not been registered via the
# ScopeManager.
#
# @param operation_name [String] The operation name for the Span
# @param child_of [SpanContext, Span] SpanContext that acts as a parent to
# the newly-started Span. If a Span instance is provided, its
# context is automatically substituted. See [Reference] for more
# information.
#
# If specified, the `references` parameter must be omitted.
# @param references [Array<Reference>] An array of reference
# objects that identify one or more parent SpanContexts.
# @param start_time [Time] When the Span started, if not now
# @param tags [Hash] Tags to assign to the Span at start time
# @param ignore_active_scope [Boolean] whether to create an implicit
# References#CHILD_OF reference to the ScopeManager#active.
# @return [Span] the newly-started Span instance, which has not been
# automatically registered via the ScopeManager
def start_span(operation_name,
child_of: nil,
references: nil,
start_time: Time.now,
tags: nil,
ignore_active_scope: false)
Span::NOOP_INSTANCE
end
# Inject a SpanContext into the given carrier
#
# @param span_context [SpanContext]
# @param format [OpenTracing::FORMAT_TEXT_MAP, OpenTracing::FORMAT_BINARY, OpenTracing::FORMAT_RACK]
# @param carrier [Carrier] A carrier object of the type dictated by the specified `format`
def inject(span_context, format, carrier)
case format
when OpenTracing::FORMAT_TEXT_MAP, OpenTracing::FORMAT_BINARY, OpenTracing::FORMAT_RACK
return nil
else
warn 'Unknown inject format'
end
end
# Extract a SpanContext in the given format from the given carrier.
#
# @param format [OpenTracing::FORMAT_TEXT_MAP, OpenTracing::FORMAT_BINARY, OpenTracing::FORMAT_RACK]
# @param carrier [Carrier] A carrier object of the type dictated by the specified `format`
# @return [SpanContext, nil] the extracted SpanContext or nil if none could be found
def extract(format, carrier)
case format
when OpenTracing::FORMAT_TEXT_MAP, OpenTracing::FORMAT_BINARY, OpenTracing::FORMAT_RACK
return SpanContext::NOOP_INSTANCE
else
warn 'Unknown extract format'
nil
end
end
end
end

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module OpenTracing
VERSION = '0.4.3'.freeze
end

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lib = File.expand_path('lib', __dir__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'opentracing/version'
Gem::Specification.new do |spec|
spec.name = 'opentracing'
spec.version = OpenTracing::VERSION
spec.authors = %w[ngauthier bcronin bensigelman]
spec.email = ['info@opentracing.io']
spec.summary = 'OpenTracing Ruby Platform API'
spec.homepage = 'https://github.com/opentracing/opentracing-ruby'
spec.license = 'Apache-2.0'
spec.files = `git ls-files -z`.split("\x0").reject do |f|
f.match(%r{^(test|spec|features)/})
end
spec.bindir = 'exe'
spec.executables = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
spec.require_paths = ['lib']
spec.add_development_dependency 'minitest', '~> 5.0'
spec.add_development_dependency 'rake', '~> 10.0'
spec.add_development_dependency 'rubocop', '~> 0.54.0'
spec.add_development_dependency 'simplecov', '~> 0.16.0'
spec.add_development_dependency 'simplecov-console', '~> 0.4.0'
end