application_helper.rb
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	module ApplicationHelper
	TIME_PERIODS = {
	1.second => 'second',
	1.minute => 'minute',
	1.hour => 'hour',
	1.day => 'day',
	1.week => 'week',
	1.month => 'month',
	1.year.to_i => 'year',
	}

	def can_edit?(object)
	return true unless object.respond_to?(:editable?)
	by = admin? ? :admin : :user

	object.editable?(by)
	end

	def seconds_to_human(seconds)
	acc = {}
	remaining = seconds
	TIME_PERIODS.to_a.reverse_each do \|p, human\|
	period_count, remaining = remaining.divmod(p)
	acc[human] = period_count if not period_count.zero?
	end

	acc.map { \|singular, count\|
	human = count < 2 ? singular : "#{singular}s"
	"#{count} #{human}"
	}.join(', ')
	end

	def link_to_edit(*args, &block)
	link_to(abbr_glyph(:pencil, 'Edit'), *args, &block)
	end

	def link_to_destroy(*args, &block)
	link_to(abbr_glyph(:remove, 'Remove'), *args, &block)
	end

	def link_to_enable(*args, &block)
	link_to(abbr_glyph(:'eye-close', 'Enable'), *args, &block)
	end

	def link_to_disable(*args, &block)
	link_to(abbr_glyph(:'eye-open', 'Disable'), *args, &block)
	end

	def link_to_mute(*args, &block)
	link_to(abbr_glyph(:'volume-off', 'Disable notifications'), *args, &block)
	end

	def link_to_unmute(*args, &block)
	link_to(abbr_glyph(:'volume-up', 'Renable notifications'), *args, &block)
	end

	def glyph(icon)
	content_tag(:span, '', class: "glyphicon glyphicon-#{icon}")
	end

	def abbr_glyph(icon, title)
	content_tag(:abbr, glyph(icon), title: title)
	end

	end