knit.rb - recursively `yarn link` together all `file:<path>` deps in package.json manifests.

knit.rb

#!/usr/bin/env ruby

# recursively `yarn link` together all `file:<path>` deps in package.json 
# manifests.
# 
# USAGE
# 
#     knit.rb PACKAGE_DIRECTORY
# 
# AUTHOR nrser
# LICENSE MIT
# 

require 'json'

DEPS_KEYS = ['dependencies', 'devDependencies', 'optionalDependencies']

$indent = 0

def log *msgs
   msgs.map {|msg|
    puts ("    " * $indent) + if msg.is_a? String
      msg
    else
      msg.inspect
    end
  }
  puts (" " * $indent)
end

def indent &block
  $indent += 1
  rtn = block.call
  $indent -= 1
  rtn
end

def link package_dir  
  Dir.chdir package_dir do
    log "link(#{ package_dir.inspect })", "in dir #{ Dir.pwd }"
    
    package_json = JSON.load File.read('package.json')
    
    DEPS_KEYS.each {|deps_key|
      if package_json.key? deps_key
        package_json[deps_key].each {|name, version|
          if version.start_with? 'file:'            
            dir = version[('file:'.length)..-1]
            
            log "processing #{ name }: #{ version }", "dir: #{ dir }"
            
            indent { link dir }
            
            Dir.chdir dir do
              log "in dir #{ Dir.pwd }", "> yarn link"
              `yarn link`
            end
            
            log "in dir #{ Dir.pwd }", "> yarn link '#{ name }'"
            `yarn link '#{ name }'`
          end
        }
      end
    }
  end
end

if __FILE__ == $0
  if ARGV[0]
    link ARGV[0]
  else
    puts "USAGE: knit.rb PACKAGE_DIRECTORY"
  end
end