Class: Dropcaster::ChannelFileLocator

Inherits:
Object
  • Object
show all
Defined in:
lib/dropcaster/channel_file_locator.rb

Overview

Encapsulates the strategy how to find the channel definition file

Class Method Summary collapse

Class Method Details

.locate(sources) ⇒ Object

Locates the channel definition file based on the sources directory.

  • If sources is a single file name, the channel definition file is expected

as channel.yml in the same directory.

  • If sources is a single directory name, the channel definition file is

expected as channel.yml in that directory.

  • If sources is an array of file names, the channel definition file is

expected as channel.yml in the directory common to all files. If the files are located in more than one directory, an AmbiguousSourcesError is raised. In that case, the caller should specify the channel.yml as command line parameter.

  • If sources is an array with more than a single directory name, an

AmbiguousSourcesError is raised. In that case, the caller should specify the channel.yml as command line parameter.



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# File 'lib/dropcaster/channel_file_locator.rb', line 25

def locate(sources)
  channel_source_dir = nil

  if sources.respond_to?(:at)
    # More than one source given. Check that they are all in the same directory.
    distinct_dirs = sources.collect{|source| File.dirname(source)}.uniq

    if 1 == distinct_dirs.size
      # If all are the in same directory, use that as source directory where channel.yml is expected.
      channel_source_dir = distinct_dirs.first
    else
      # Since no channel_file was specified at the command line, throw and quit
      raise AmbiguousSourcesError.new(sources)
    end
  else
    # If a single file or directory is given, use that as source directory where channel.yml is expected.
    channel_source_dir = File.dirname(sources)
  end

  File.join(channel_source_dir, CHANNEL_YML)
end