Cocoapods命令行是怎么工作的?

# encoding: UTF-8
require File.expand_path('../lib/cocoapods/gem_version', __FILE__)
require 'date'

Gem::Specification.new do |s|
  s.name     = "cocoapods"
  s.version  = Pod::VERSION
  s.date     = Date.today
  s.license  = "MIT"
  s.email    = ["eloy.de.enige@gmail.com", "fabiopelosin@gmail.com", "kyle@fuller.li", "segiddins@segiddins.me"]
  s.homepage = "https://github.com/CocoaPods/CocoaPods"
  s.authors  = ["Eloy Duran", "Fabio Pelosin", "Kyle Fuller", "Samuel Giddins"]

  s.summary     = "The Cocoa library package manager."
  s.description = "CocoaPods manages library dependencies for your Xcode project.\n\n"     \
                  "You specify the dependencies for your project in one easy text file. "  \
                  "CocoaPods resolves dependencies between libraries, fetches source "     \
                  "code for the dependencies, and creates and maintains an Xcode "         \
                  "workspace to build your project.\n\n"                                   \
                  "Ultimately, the goal is to improve discoverability of, and engagement " \
                  "in, third party open-source libraries, by creating a more centralized " \
                  "ecosystem."

  s.files = Dir["lib/**/*.rb"] + %w{ bin/pod bin/sandbox-pod README.md LICENSE CHANGELOG.md }

  s.executables   = %w{ pod sandbox-pod }
  s.require_paths = %w{ lib }

  # Link with the version of CocoaPods-Core
  s.add_runtime_dependency 'cocoapods-core',        "= #{Pod::VERSION}"

  s.add_runtime_dependency 'claide',                '>= 1.0.2', '< 2.0'
  s.add_runtime_dependency 'cocoapods-deintegrate', '>= 1.0.2', '< 2.0'
  s.add_runtime_dependency 'cocoapods-downloader',  '>= 1.2.0', '< 2.0'
  s.add_runtime_dependency 'cocoapods-plugins',     '>= 1.0.0', '< 2.0'
  s.add_runtime_dependency 'cocoapods-search',      '>= 1.0.0', '< 2.0'
  s.add_runtime_dependency 'cocoapods-stats',       '>= 1.0.0', '< 2.0'
  s.add_runtime_dependency 'cocoapods-trunk',       '>= 1.3.0', '< 2.0'
  s.add_runtime_dependency 'cocoapods-try',         '>= 1.1.0', '< 2.0'
  s.add_runtime_dependency 'molinillo',             '~> 0.6.5'
  s.add_runtime_dependency 'xcodeproj',             '>= 1.5.7', '< 2.0'

  ## Version 5 needs Ruby 2.2, so we specify an upper bound to stay compatible with system ruby
  s.add_runtime_dependency 'activesupport', '>= 4.0.2', '< 5'
  s.add_runtime_dependency 'colored2',       '~> 3.1'
  s.add_runtime_dependency 'escape',        '~> 0.0.4'
  s.add_runtime_dependency 'fourflusher',   '~> 2.0.1'
  s.add_runtime_dependency 'gh_inspector',  '~> 1.0'
  s.add_runtime_dependency 'nap',           '~> 1.0'
  s.add_runtime_dependency 'ruby-macho',    '~> 1.1'

  s.add_development_dependency 'bacon', '~> 1.1'
  s.add_development_dependency 'bundler', '~> 1.3'
  s.add_development_dependency 'rake', '~> 10.0'

  ## Make sure you can build the gem on older versions of RubyGems too:
  s.rubygems_version = "1.6.2"
  s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
  s.required_ruby_version = '>= 2.0.0'
  s.specification_version = 3 if s.respond_to? :specification_version
end

#!/usr/bin/env ruby
#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

require 'rubygems'
require 'rubygems/gem_runner'
require 'rubygems/exceptions'

required_version = Gem::Requirement.new ">= 1.8.7"

unless required_version.satisfied_by? Gem.ruby_version then
  abort "Expected Ruby version #{required_version}, is #{Gem.ruby_version}"
end

args = ARGV.clone

begin
  Gem::GemRunner.new.run args
rescue Gem::SystemExitException => e
  exit e.exit_code
end

#!/usr/local/opt/ruby/bin/ruby
# 
# This file was generated by RubyGems.
#
# The application 'cocoapods' is installed as part of a gem, and
# this file is here to facilitate running it.
#

require 'rubygems'

version = ">= 0.a"

if ARGV.first
  str = ARGV.first
  str = str.dup.force_encoding("BINARY") if str.respond_to? :force_encoding
  if str =~ /\A_(.*)_\z/ and Gem::Version.correct?($1) then
    version = $1
    ARGV.shift
  end
end

load Gem.activate_bin_path('cocoapods', 'pod', version)

#!/usr/bin/env ruby

if Encoding.default_external != Encoding::UTF_8

  if ARGV.include? '--no-ansi'
    STDERR.puts <<-DOC
    WARNING: CocoaPods requires your terminal to be using UTF-8 encoding.
    Consider adding the following to ~/.profile:

    export LANG=en_US.UTF-8
    DOC
  else
    STDERR.puts <<-DOC
    \e[33mWARNING: CocoaPods requires your terminal to be using UTF-8 encoding.
    Consider adding the following to ~/.profile:

    export LANG=en_US.UTF-8
    \e[0m
    DOC
  end

end

if $PROGRAM_NAME == __FILE__ && !ENV['COCOAPODS_NO_BUNDLER']
  ENV['BUNDLE_GEMFILE'] = File.expand_path('../../Gemfile', __FILE__)
  require 'rubygems'
  require 'bundler/setup'
  $LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
elsif ENV['COCOAPODS_NO_BUNDLER']
  require 'rubygems'
  gem 'cocoapods'
end

STDOUT.sync = true if ENV['CP_STDOUT_SYNC'] == 'TRUE'

require 'cocoapods'

if profile_filename = ENV['PROFILE']
  require 'ruby-prof'
  reporter =
    case (profile_extname = File.extname(profile_filename))
    when '.txt'
      RubyProf::FlatPrinterWithLineNumbers
    when '.html'
      RubyProf::GraphHtmlPrinter
    when '.callgrind'
      RubyProf::CallTreePrinter
    else
      raise "Unknown profiler format indicated by extension: #{profile_extname}"
    end
  File.open(profile_filename, 'w') do |io|
    reporter.new(RubyProf.profile { Pod::Command.run(ARGV) }).print(io)
  end
else
  Pod::Command.run(ARGV)
end