60 lines
1.7 KiB
Ruby
60 lines
1.7 KiB
Ruby
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module Locomotive
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module Liquid
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module Tags
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# Display the children pages of the site or the current page. If not precised, nav is applied on the current page.
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# The html output is based on the ul/li tags.
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#
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# Usage:
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#
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# {% nav site %} => <ul class="nav"><li class="on"><a href="/features">Features</a></li></ul>
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#
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class Nav < ::Liquid::Tag
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Syntax = /(#{::Liquid::Expression}+)?/
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def initialize(tag_name, markup, tokens)
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if markup =~ Syntax
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@site_or_page = $1 || 'page'
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else
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raise ::Liquid::SyntaxError.new("Syntax Error in 'nav' - Valid syntax: nav <page|site>")
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end
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super
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end
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def render(context)
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@current_page = context.registers[:page]
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source = context.registers[@site_or_page.to_sym]
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# puts "[Nav] source = #{source.inspect}"
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if source.respond_to?(:name) # site ?
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source = source.pages.first # start from home page
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else
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source = source.parent
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end
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output = %{<ul id="nav">}
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output += source.children.map { |p| render_child_link(p) }.join("\n")
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output += %{</ul>}
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output
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end
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private
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def render_child_link(page)
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selected = @current_page._id == page._id ? ' on' : ''
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%{
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<li id="#{page.slug.dasherize}" class="link#{selected}">
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<a href="/#{page.fullpath}">#{page.title}</a>
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</li>
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}.strip
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end
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::Liquid::Template.register_tag('nav', Nav)
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end
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end
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end
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end
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