Module: Ramaze::Helper::Link

Included in:
Action, Paginate::Paginator, Pager
Defined in:
lib/ramaze/helper/link.rb

Overview

Helper::Link is included into the Controller by default

Usage is shown in spec/ramaze/helper/link.rb and the rdocs below.

Instance Method Summary collapse

Instance Method Details

#A(*args) ⇒ Object

Builds a basic <a> tag.

‘text` is mandatory, the second hash of options will be transformed into arguments of the tag, :href is a special case and its segments will be escaped.

If you pass no :href, the text will be run through Rs and its result is used instead. If you really want an empty href, use :href => ”

Usage:

A('text')                       #> <a href="/text">text</a>
A('foo/bar')                    #> <a href="/foo/bar">foo/bar</a>
A('/foo?x=y')                   #> <a href="/foo?x=y">/foo?x=y</a>
A('text', :href => '/foo?x=y')  #> <a href="/foo?x=y">text</a>
A('Home', :href => Rs(:/))      #> <a href="/foo/bar">Home</a>



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# File 'lib/ramaze/helper/link.rb', line 26

def A(*args)
  hash = args.last.respond_to?(:to_hash) ? args.pop : {}

  hash[:href] ||= Rs(*args)
  text = hash.delete(:text) || args.last || hash[:title] || hash[:href]
  hash[:href] = hash[:href].to_s.gsub(/[^\/?;=]+/){|m| Rack::Utils.escape(m) }

  args = ['']
  hash.each {|k,v| args << %(#{k}="#{v}") if k and v }

  %(<a#{args.join(' ')}>#{text}</a>)
end

#breadcrumbs(path, split = '/', join = '/', href_prefix = '') ⇒ Object

Give it a path with character to split at and one to join the crumbs with. It will generate a list of links that act as pointers to previous pages on this path.

Example:

breadcrumbs('/path/to/somewhere')

# results in this, newlines added for readability:

<a href="/path">path</a>/
<a href="/path/to">to</a>/
<a href="/path/to/somewhere">somewhere</a>

Optionally a href prefix can be specified which generate link names a above, but with the prefix prepended to the href path.

Example:

breadcrumbs('/path/to/somewhere', '/', '/', '/mycontroller/action')

# results in this, newlines added for readability:

<a href="/mycontroller/action/path">path</a>/
<a href="/mycontroller/action/path/to">to</a>/
<a href="/mycontroller/action/path/to/somewhere">somewhere</a>



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# File 'lib/ramaze/helper/link.rb', line 112

def breadcrumbs(path, split = '/', join = '/', href_prefix = '')
  atoms = path.split(split).reject{|a| a.empty?}
  crumbs = atoms.inject([]){|s,v| s << [s.last,v]}
  bread = crumbs.map do |a|
    href_path = href_prefix + a*'/'
    A(a[-1], :href=>(href_path))
  end
  bread.join(join)
end

#R(*atoms) ⇒ Object

Builds links out of segments.

Pass it strings, symbols, controllers and it will produce a link out of it. Paths to Controllers are obtained from Global.mapping.

For brevity, the mapping for the example below is following:

{ MC => '/', OC => '/o', ODC => '/od' }

Usage:

R(MC) #=> '/'
R(OC) #=> '/o'
R(ODC) #=> '/od'
R(MC, :foo) #=> '/foo'
R(OC, :foo) #=> '/o/foo'
R(ODC, :foo) #=> '/od/foo'
R(MC, :foo, :bar => :x) #=> '/foo?bar=x'



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# File 'lib/ramaze/helper/link.rb', line 56

def R(*atoms)
  args, atoms = atoms.flatten.partition{|a| a.is_a?(Hash) }
  args = args.flatten.inject{|s,v| s.merge!(v) }

  map = Global.mapping.invert

  atoms.map! do |atom|
    if atom.is_a?(Ramaze::Controller)
      map[atom.class]
    else
      map[atom]
    end or atom.to_s
  end

  front = [Global.prefix, *atoms].join('/').squeeze('/')

  if args
    rear = args.inject('?'){|s,(k,v)| s << "#{Rack::Utils.escape(k)}=#{Rack::Utils.escape(v)};"}[0..-2]
    front + rear
  else
    front
  end
end

#Rs(*atoms) ⇒ Object

Uses R with Controller.current as first element.



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# File 'lib/ramaze/helper/link.rb', line 82

def Rs(*atoms)
  atoms.unshift Controller.current unless atoms.first.is_a?(Controller)
  R(*atoms)
end