Module: Middleman::CoreExtensions::Rendering::InstanceMethods
- Defined in:
- lib/middleman-core/core_extensions/rendering.rb
Overview
Rendering instance methods
Instance Method Summary collapse
-
#current_engine ⇒ Symbol?
The currently rendering engine.
-
#fetch_layout(engine, opts) ⇒ String
Find a layout for a given engine.
-
#locate_layout(name, preferred_engine = nil) ⇒ String
Find a layout on-disk, optionally using a specific engine.
-
#options_for_ext(ext) ⇒ Hash
Get a hash of configuration options for a given file extension, from config.rb.
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#render(engine, data, options = {}, &block) ⇒ String
Sinatra/Padrino compatible render method signature referenced by some view helpers.
-
#render_individual_file(path, locs = {}, opts = {}, context = self, &block) ⇒ String
Render an on-disk file.
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#render_template(path, locs = {}, opts = {}, blocks = []) ⇒ String
Render a template, with layout, given a path.
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#resolve_template(request_path, options = {}) ⇒ Array<String, Symbol>, Boolean
Find a template on disk given a output path.
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#template_data_for_file(path) ⇒ String
Get the template data from a path.
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#template_extensions(extension_map = nil) ⇒ Hash
Add or overwrite a default template extension.
-
#wrap_layout(layout_name, &block) ⇒ void
Allow layouts to be wrapped in the contents of other layouts.
Instance Method Details
#current_engine ⇒ Symbol?
The currently rendering engine
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# File 'lib/middleman-core/core_extensions/rendering.rb', line 412 def current_engine @current_engine ||= nil end |
#fetch_layout(engine, opts) ⇒ String
Find a layout for a given engine
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# File 'lib/middleman-core/core_extensions/rendering.rb', line 312 def fetch_layout(engine, opts) # The layout name comes from either the system default or the options local_layout = opts.has_key?(:layout) ? opts[:layout] : layout return false unless local_layout # Look for engine-specific options = respond_to?(engine) ? send(engine) : {} # The engine for the layout can be set in options, engine_options or passed # into this method layout_engine = if opts.has_key?(:layout_engine) opts[:layout_engine] elsif .has_key?(:layout_engine) [:layout_engine] else engine end # Automatic mode if local_layout == :_auto_layout # Look for :layout of any extension # If found, use it. If not, continue locate_layout(:layout, layout_engine) || false else # Look for specific layout # If found, use it. If not, error. if layout_path = locate_layout(local_layout, layout_engine) layout_path else raise ::Middleman::CoreExtensions::Rendering::TemplateNotFound, "Could not locate layout: #{local_layout}" end end end |
#locate_layout(name, preferred_engine = nil) ⇒ String
Find a layout on-disk, optionally using a specific engine
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# File 'lib/middleman-core/core_extensions/rendering.rb', line 350 def locate_layout(name, preferred_engine=nil) # Whether we've found the layout layout_path = false # If we prefer a specific engine if !preferred_engine.nil? # Check root layout_path, layout_engine = resolve_template(name, :preferred_engine => preferred_engine) # Check layouts folder if !layout_path layout_path, layout_engine = resolve_template(File.join("layouts", name.to_s), :preferred_engine => preferred_engine) end end # Check root, no preference if !layout_path layout_path, layout_engine = resolve_template(name) end # Check layouts folder, no preference if !layout_path layout_path, layout_engine = resolve_template(File.join("layouts", name.to_s)) end # Return the path layout_path end |
#options_for_ext(ext) ⇒ Hash
Get a hash of configuration options for a given file extension, from config.rb
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# File 'lib/middleman-core/core_extensions/rendering.rb', line 289 def (ext) # Read options for extension from config/Tilt or cache cache.fetch(:options_for_ext, ext) do = {} # Find all the engines which handle this extension in tilt. Look for # config variables of that name and merge it extension_class = ::Tilt[ext] ::Tilt.mappings.each do |ext, engines| next unless engines.include? extension_class = respond_to?(ext.to_sym) ? send(ext.to_sym) : {} .merge!() end end end |
#render(engine, data, options = {}, &block) ⇒ String
Sinatra/Padrino compatible render method signature referenced by some view helpers. Especially partials.
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# File 'lib/middleman-core/core_extensions/rendering.rb', line 181 def render(engine, data, ={}, &block) data = data.to_s locals = [:locals] found_partial = false engine = nil # If the path is known to the sitemap if resource = sitemap.find_resource_by_path(current_path) current_dir = File.dirname(resource.source_file) engine = File.extname(resource.source_file)[1..-1].to_sym # Look for partials relative to the current path if current_dir != self.source_dir relative_dir = File.join(current_dir.sub("#{self.source_dir}/", ""), data) # Try to use the current engine first found_partial, found_engine = resolve_template(relative_dir, :preferred_engine => engine, :try_without_underscore => true) # Fall back to any engine available if !found_partial found_partial, found_engine = resolve_template(relative_dir, :try_without_underscore => true) end end end # Look in the root for the partial with the current engine if !found_partial && !engine.nil? found_partial, found_engine = resolve_template(data, :preferred_engine => engine, :try_without_underscore => true) end # Look in the root with any engine if !found_partial found_partial, found_engine = resolve_template(data, :try_without_underscore => true) end # Render the partial if found, otherwide throw exception if found_partial render_individual_file(found_partial, locals, , self, &block) else raise ::Middleman::CoreExtensions::Rendering::TemplateNotFound, "Could not locate partial: #{data}" end end |
#render_individual_file(path, locs = {}, opts = {}, context = self, &block) ⇒ String
Render an on-disk file. Used for everything, including layouts.
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# File 'lib/middleman-core/core_extensions/rendering.rb', line 233 def render_individual_file(path, locs = {}, opts = {}, context = self, &block) path = path.to_s # Save current buffer for later @_out_buf, _buf_was = "", @_out_buf # Read from disk or cache the contents of the file body = if opts[:template_body] opts.delete(:template_body) else template_data_for_file(path) end # Merge per-extension options from config extension = File.extname(path) = opts.merge((extension)) [:outvar] ||= '@_out_buf' template_class = Tilt[path] # Allow hooks to manipulate the template before render self.class.callbacks_for_hook(:before_render).each do |callback| newbody = callback.call(body, path, locs, template_class) body = newbody if newbody # Allow the callback to return nil to skip it end # Read compiled template from disk or cache template = cache.fetch(:compiled_template, , body) do ::Tilt.new(path, 1, ) { body } end # Render using Tilt content = template.render(context, locs, &block) # Allow hooks to manipulate the result after render self.class.callbacks_for_hook(:after_render).each do |callback| content = callback.call(content, path, locs, template_class) end return content ensure # Reset stored buffer @_out_buf = _buf_was end |
#render_template(path, locs = {}, opts = {}, blocks = []) ⇒ String
Render a template, with layout, given a path
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# File 'lib/middleman-core/core_extensions/rendering.rb', line 124 def render_template(path, locs={}, opts={}, blocks=[]) # Detect the remdering engine from the extension extension = File.extname(path) engine = extension[1..-1].to_sym # Store last engine for later (could be inside nested renders) @current_engine, engine_was = engine, @current_engine # Use a dup of self as a context so that instance variables set within # the template don't persist for other templates. context = self.dup blocks.each do |block| context.instance_eval(&block) end # Store current locs/opts for later @current_locs = locs, @current_opts = opts # Keep rendering template until we've used up all extensions. This # handles cases like `style.css.sass.erb` content = nil while ::Tilt[path] begin opts[:template_body] = content if content content = render_individual_file(path, locs, opts, context) path = File.basename(path, File.extname(path)) rescue LocalJumpError => e raise "Tried to render a layout (calls yield) at #{path} like it was a template. Non-default layouts need to be in #{source}/layouts." end end # Certain output file types don't use layouts needs_layout = !%w(.js .json .css .txt).include?(File.extname(path)) # If we need a layout and have a layout, use it if needs_layout && layout_path = fetch_layout(engine, opts) content = render_individual_file(layout_path, locs, opts, context) { content } end # Return result content ensure # Pop all the saved variables from earlier as we may be returning to a # previous render (layouts, partials, nested layouts). @current_engine = engine_was @content_blocks = nil @current_locs = nil @current_opts = nil end |
#resolve_template(request_path, options = {}) ⇒ Array<String, Symbol>, Boolean
Find a template on disk given a output path
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# File 'lib/middleman-core/core_extensions/rendering.rb', line 420 def resolve_template(request_path, ={}) # Find the path by searching or using the cache request_path = request_path.to_s cache.fetch(:resolve_template, request_path, ) do relative_path = Util.strip_leading_slash(request_path) on_disk_path = File.(relative_path, self.source_dir) # By default, any engine will do preferred_engine = "*" # Unless we're specifically looking for a preferred engine if .has_key?(:preferred_engine) extension_class = ::Tilt[[:preferred_engine]] matched_exts = [] # Get a list of extensions for a preferred engine # TODO: Cache this ::Tilt.mappings.each do |ext, engines| next unless engines.include? extension_class matched_exts << ext end # Change the glob to only look for the matched extensions if matched_exts.length > 0 preferred_engine = "{" + matched_exts.join(",") + "}" else return false end end # Look for files that match path_with_ext = on_disk_path + "." + preferred_engine found_path = Dir[path_with_ext].find do |path| ::Tilt[path] end if !found_path && [:try_without_underscore] && path_no_underscore = path_with_ext. sub(relative_path, relative_path.sub(/^_/, ""). sub(/\/_/, "/")) found_path = Dir[path_no_underscore].find do |path| ::Tilt[path] end end # If we found one, return it and the found engine if found_path || (File.exists?(on_disk_path) && !File.directory?(on_disk_path)) engine = found_path ? File.extname(found_path)[1..-1].to_sym : nil [ found_path || on_disk_path, engine ] else false end end end |
#template_data_for_file(path) ⇒ String
Get the template data from a path
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# File 'lib/middleman-core/core_extensions/rendering.rb', line 280 def template_data_for_file(path) File.read(File.(path, source_dir)) end |
#template_extensions(extension_map = nil) ⇒ Hash
Add or overwrite a default template extension
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# File 'lib/middleman-core/core_extensions/rendering.rb', line 112 def template_extensions(extension_map=nil) @_template_extensions ||= {} @_template_extensions.merge!(extension_map) if extension_map @_template_extensions end |
#wrap_layout(layout_name, &block) ⇒ void
This method returns an undefined value.
Allow layouts to be wrapped in the contents of other layouts
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# File 'lib/middleman-core/core_extensions/rendering.rb', line 382 def wrap_layout(layout_name, &block) # Save current buffer for later @_out_buf, _buf_was = "", @_out_buf layout_path = locate_layout(layout_name, current_engine) extension = File.extname(layout_path) engine = extension[1..-1].to_sym # Store last engine for later (could be inside nested renders) @current_engine, engine_was = engine, @current_engine begin content = if block_given? capture_html(&block) else "" end ensure # Reset stored buffer @_out_buf = _buf_was end concat_content render_individual_file(layout_path, @current_locs || {}, @current_opts || {}, self) { content } ensure @current_engine = engine_was end |