Merge pull request #6585 from mitchellh/sethvargo/presence
Add presence helpers
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commit
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module Vagrant
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module Util
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module Presence
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extend self
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# Determines if the given object is "present". A String is considered
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# present if the stripped contents are not empty. An Array/Hash is
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# considered present if they have a length of more than 1. "true" is
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# always present and `false` and `nil` are always not present. Any other
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# object is considered to be present.
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#
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# @return [true, false]
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def present?(obj)
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case obj
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when String
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!obj.strip.empty?
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when Array, Hash
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!obj.empty?
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when TrueClass, FalseClass
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obj
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when NilClass
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false
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when Object
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true
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end
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end
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# Returns the presence of the object. If the object is {present?}, it is
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# returned. Otherwise `false` is returned.
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#
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# @return [Object, false]
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def presence(obj)
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if present?(obj)
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obj
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else
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false
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end
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end
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end
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end
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end
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require File.expand_path("../../../base", __FILE__)
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require "vagrant/util/presence"
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describe Vagrant::Util::Presence do
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subject { described_class }
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describe "#presence" do
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it "returns false for nil" do
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expect(subject.presence(nil)).to be(false)
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end
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it "returns false for false" do
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expect(subject.presence(false)).to be(false)
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end
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it "returns false for an empty string" do
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expect(subject.presence("")).to be(false)
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end
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it "returns false for a string with null bytes" do
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expect(subject.presence("\u0000")).to be(false)
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end
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it "returns false for an empty array" do
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expect(subject.presence([])).to be(false)
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end
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it "returns false for an empty hash" do
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expect(subject.presence({})).to be(false)
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end
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it "returns true for true" do
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expect(subject.presence(true)).to be(true)
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end
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it "returns the object for an object" do
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obj = Object.new
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expect(subject.presence(obj)).to be(obj)
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end
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it "returns the class for a class" do
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expect(subject.presence(String)).to be(String)
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end
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end
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end
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