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Contents
module Config
module Sources
# Allows settings to be loaded from a "flat" hash with string keys, like ENV.
class EnvSource
attr_reader :prefix
attr_reader :separator
attr_reader :converter
attr_reader :parse_values
def initialize(env,
prefix: Config.env_prefix || Config.const_name,
separator: Config.env_separator,
converter: Config.env_converter,
parse_values: Config.env_parse_values)
@env = env
@prefix = prefix.to_s.split(separator)
@separator = separator
@converter = converter
@parse_values = parse_values
end
def load
return {} if @env.nil? || @env.empty?
hash = Hash.new
@env.each do |variable, value|
keys = variable.to_s.split(separator)
next if keys.shift(prefix.size) != prefix
keys.map! { |key|
case converter
when :downcase then
key.downcase
when nil then
key
else
raise "Invalid ENV variables name converter: #{converter}"
end
}
leaf = keys[0...-1].inject(hash) { |h, key|
h[key] ||= {}
}
unless leaf.is_a?(Hash)
conflicting_key = (prefix + keys[0...-1]).join(separator)
raise "Environment variable #{variable} conflicts with variable #{conflicting_key}"
end
leaf[keys.last] = parse_values ? __value(value) : value
end
hash
end
private
# Try to convert string to a correct type
def __value(v)
case v
when 'false'
false
when 'true'
true
else
Integer(v) rescue Float(v) rescue v
end
end
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems